Como citar este trabajo
Torri S, Puelles M. 2010. Use of vermiculture technology for waste management and environmental remediation in Argentina, International Journal of Environmental Engineering (IJEE), Sp. Issue on Vermiculture Technology, Vol. 10, No.3/4 pp. 239 –254. doi:10.1504/IJGENVI.2010.037269. ISSN (Online): 1756-8471, ISSN (Print): 1756-8463.
Earthworms for Safe and Useful Management of Solid Wastes and Wastewatersx3G9
Earthworms for Safe and Useful Management of Solid Wastes and Wastewaters, Remediation of Contaminated Soils and Restoration of Soil Fertility, Promotion of Organic Farming and Mitigation of Global Warming
Earthworms for Safe and Useful Management of Solid Wastes and Wastewatersx3G9
Earthworms for Safe and Useful Management of Solid Wastes and Wastewaters, Remediation of Contaminated Soils and Restoration of Soil Fertility, Promotion of Organic Farming and Mitigation of Global Warming
Composting is nature's process of recycling decomposed organic materials into a rich soil known as compost. Anything that was once living will decompose
Properties of farm soil using compost vis-a-vis chemical fertilizers: Suhane (182) studied the chemical and
biological properties of soil under organic farming (using various types of composts) and chemical farming
(using chemical fertilizers-urea (N), phosphates (P) and potash (K)). Results are given in Table 1.
All compost (including vermicompost), are produced from some ‘waste materials’ of society which is
converted into a ‘valuable resource’. It is like ‘killing two birds in one shot’. More significant is that it is of
biological origin i.e. a ‘renewable resource’ and will be readily available to mankind in future. Currently, municipal solid waste (MSW) management problem has been an issue of global threat and has baffled authorities in their quest to manage solid waste in a sustained state. Current studies on solid waste characterisation in Ghana gave approximately 60% putrescible waste making large scale vermicomposting very feasible. The main objectives of the research were: (1) To innovatively use African Night Crawlers (Eudrilus eugeniae) to recycle organic food waste into vermicompost directly on highly degraded mine laterite using simple in-situ technology.
A short presentation highlighting the various benefits that compost have. Apart from the benefits it also shows how much compost can be important to ecology as a habitat to micro-organisms (i.e. decomposers) and its ability to have higher yields since it is regarded as a natural fertilizer.
Please also note that compost is completely produced from organic waste, thus when producing compost we are being environmental-friendly by reducing waste in our landfills.
Microbiological and physicochemical analyses of top soils obtained from four ...Innspub Net
Several methodologies were utilized to evaluate the microbiological and physico chemical properties of top soil samples bored from four municipal waste dumpsites and a farmland (control sample) all located in Benin City, Edo State. The soil samples were obtained during the month of January, 2013. The mean aerobic bacterial counts for the soil samples ranged from 9.7 × 103 cfu/g for the control soil to 1.80 × 104 cfu/g for the soil sourced from the dump site at Ikheuniro. The mean heterotrophic fungal counts varied from 7.0 × 102 cfu/g for capitol dumpsite to 3.3 × 103 cfu/g for the control soil. Ten (10) microbial isolates were characterized and identified; Bacillus sp., Pseudomonas sp., Aeromonas sp., Enterobacter sp., Klebsiella sp. and Staphylococcus sp., Aspergillus sp., Mucor sp., Saccharomyces sp. and Fusarium sp. respectively. Both Bacillus sp. and Pseudomonas sp. were the most dominant amongst the bacterial isolates whilst Staphylococcus sp. was the least occurring bacterial isolate. Aspergillus sp. was the highest occurring fungal isolate while the least isolated fungal culture was Saccharomyces sp. The physico chemical results showed values which ranged from 5.60 to 8.08, 164.00 µS/cm to 540.00 µS/cm, 2.378 mg/kg to 3.444 mg/kg, 0.009 mg/kg to 0.016 mg/kg for pH, electrical conductivity, sulphate and cadmium. Despite the positive impacts of the dumped municipal wastes on the microbial and organic properties of the analyzed soils, disposal of municipal wastes in open dump sites is an archaic and unsustainable option in the management of municipal wastes. Get the full articles at: http://www.innspub.net/volume-1-number-1-september-2013/
Composting is nature's process of recycling decomposed organic materials into a rich soil known as compost. Anything that was once living will decompose
Properties of farm soil using compost vis-a-vis chemical fertilizers: Suhane (182) studied the chemical and
biological properties of soil under organic farming (using various types of composts) and chemical farming
(using chemical fertilizers-urea (N), phosphates (P) and potash (K)). Results are given in Table 1.
All compost (including vermicompost), are produced from some ‘waste materials’ of society which is
converted into a ‘valuable resource’. It is like ‘killing two birds in one shot’. More significant is that it is of
biological origin i.e. a ‘renewable resource’ and will be readily available to mankind in future. Currently, municipal solid waste (MSW) management problem has been an issue of global threat and has baffled authorities in their quest to manage solid waste in a sustained state. Current studies on solid waste characterisation in Ghana gave approximately 60% putrescible waste making large scale vermicomposting very feasible. The main objectives of the research were: (1) To innovatively use African Night Crawlers (Eudrilus eugeniae) to recycle organic food waste into vermicompost directly on highly degraded mine laterite using simple in-situ technology.
A short presentation highlighting the various benefits that compost have. Apart from the benefits it also shows how much compost can be important to ecology as a habitat to micro-organisms (i.e. decomposers) and its ability to have higher yields since it is regarded as a natural fertilizer.
Please also note that compost is completely produced from organic waste, thus when producing compost we are being environmental-friendly by reducing waste in our landfills.
Microbiological and physicochemical analyses of top soils obtained from four ...Innspub Net
Several methodologies were utilized to evaluate the microbiological and physico chemical properties of top soil samples bored from four municipal waste dumpsites and a farmland (control sample) all located in Benin City, Edo State. The soil samples were obtained during the month of January, 2013. The mean aerobic bacterial counts for the soil samples ranged from 9.7 × 103 cfu/g for the control soil to 1.80 × 104 cfu/g for the soil sourced from the dump site at Ikheuniro. The mean heterotrophic fungal counts varied from 7.0 × 102 cfu/g for capitol dumpsite to 3.3 × 103 cfu/g for the control soil. Ten (10) microbial isolates were characterized and identified; Bacillus sp., Pseudomonas sp., Aeromonas sp., Enterobacter sp., Klebsiella sp. and Staphylococcus sp., Aspergillus sp., Mucor sp., Saccharomyces sp. and Fusarium sp. respectively. Both Bacillus sp. and Pseudomonas sp. were the most dominant amongst the bacterial isolates whilst Staphylococcus sp. was the least occurring bacterial isolate. Aspergillus sp. was the highest occurring fungal isolate while the least isolated fungal culture was Saccharomyces sp. The physico chemical results showed values which ranged from 5.60 to 8.08, 164.00 µS/cm to 540.00 µS/cm, 2.378 mg/kg to 3.444 mg/kg, 0.009 mg/kg to 0.016 mg/kg for pH, electrical conductivity, sulphate and cadmium. Despite the positive impacts of the dumped municipal wastes on the microbial and organic properties of the analyzed soils, disposal of municipal wastes in open dump sites is an archaic and unsustainable option in the management of municipal wastes. Get the full articles at: http://www.innspub.net/volume-1-number-1-september-2013/
Fate of cadmium, copper, lead and zinc on soils after the application of dif...Silvana Torri
Como citar este trabajo
Torri S, Lavado R. 2009. Fate of cadmium, copper, lead and zinc on soils after the application of different treated sewage sludge in soils of the Pampas region. In: Sewage Treatment: Uses, Processes and Impact. Editors: Anna Stephens and Mark Fuller, Nova Science Publishers, Inc., Hauppauge, NY 11788. ISBN: 978-1-60692-959-9. 95-123. 394p.
Earthworms for Safe and Useful Management of Solid Wastes and Wastewaters, Remediation of Contaminated Soils and Restoration of Soil Fertility, Promotion of Organic Farming and Mitigation of Global Warming
Review on Biogas Production in NigeriaAJSERJournal
One of the greatest challenges facing the Nigerian societies now and in the future is the reduction of green
house gas emissions, energy generation, power supply and thus preventing the climate change. It is therefore necessary
to look for an alternative with renewable and recycling sources, such as biogas. Biogas can be produced from various
organic waste streams or as a byproduct from industrial processes. Beside energy production, the degradation of
organic waste through anaerobic digestion offers other advantages, such as the prevention of odor release and the
decrease of pathogens. Moreover, the nutrient rich digested residues can be utilized as fertilizer for recycling the
nutrients back to the fields. However, the amount of organic materials currently available for biogas production is
limited and new substrates as well as new effective technologies are therefore needed to facilitate the growth of the
biogas industry all over the world. Hence, major developments have been made during the last decades regarding the
utilization of lignocelluloses biomass, the development of high rate systems and the application of membrane
technologies within the anaerobic digestion process in order to overcome the shortcomings encountered. The
degradation of organic material requires a synchronized action of different groups of microorganisms with different
metabolic capacities. Recent developments in molecular biology techniques have provided the research community
with a valuable tool for improved understanding of this complex microbiological system, which in turn could help
optimize and control the process in an effective way in the future.
Review on Biogas Production in NigeriaAJSERJournal
One of the greatest challenges facing the Nigerian societies now and in the future is the reduction of green
house gas emissions, energy generation, power supply and thus preventing the climate change. It is therefore necessary
to look for an alternative with renewable and recycling sources, such as biogas. Biogas can be produced from various
organic waste streams or as a byproduct from industrial processes. Beside energy production, the degradation of
organic waste through anaerobic digestion offers other advantages, such as the prevention of odor release and the
decrease of pathogens. Moreover, the nutrient rich digested residues can be utilized as fertilizer for recycling the
nutrients back to the fields. However, the amount of organic materials currently available for biogas production is
limited and new substrates as well as new effective technologies are therefore needed to facilitate the growth of the
biogas industry all over the world. Hence, major developments have been made during the last decades regarding the
utilization of lignocelluloses biomass, the development of high rate systems and the application of membrane
technologies within the anaerobic digestion process in order to overcome the shortcomings encountered. The
degradation of organic material requires a synchronized action of different groups of microorganisms with different
metabolic capacities. Recent developments in molecular biology techniques have provided the research community
with a valuable tool for improved understanding of this complex microbiological system, which in turn could help
optimize and control the process in an effective way in the future.
Phytoremediation, a Biotechnology with Important Applications by Vanesa Pérez...CrimsonpublishersMCDA
The pollutants found in the environment, of natural origin and as a result of human activity, generate a negative impact on ecosystems. The resolution of this type of problems through the application of environmentally friendly technologies are of extreme necessity, one of these technologies is phytoremediation. Pollution with different types of substances has become a phenomenon of great importance because it affects air, water and soil, also disturbing all the ecosystems that develop in them, including humans.
https://crimsonpublishers.com/mcda/fulltext/MCDA.000578.php
For more open access journals in Crimson Publishers please click on link: https://crimsonpublishers.com
For more articles on International Journal of Agronomy please click on below link: https://crimsonpublishers.com/mcda/
Similar to Use of vermiculture technology for waste management and environmental remediation in Argentina, (20)
Como citar este trabajo
Torri S.I., Corrêa R.S., Renella G. 2017. Biosolids application to agricultural land: a contribution to global phosphorus recycle, Pedosphere 27(1): 1–16, doi:10.1016/S1002-0160(15)60106-0, ISSN 1002-0160/CN 32-1315/P
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Como citar este trabajo
Torri S.I., Corrêa R.S., Renella G. 2017. Biosolids application to agricultural land: a contribution to global phosphorus recycle, Pedosphere 27(1): 1–16, doi:10.1016/S1002-0160(15)60106-0, ISSN 1002-0160/CN 32-1315/P
Soil carbon sequestration resulting from biosolids application, Silvana Torri
Como citar este trabajo
Torri S.I., Corrêa R.S., Renella G. 2014. Soil carbon sequestration resulting from biosolids application, Applied and Environmental Soil Science (ISSN: 1687-7667), Volume 2014 (2014), Article ID 821768, 9 pages. doi:10.1155/2014/821768.
Characterization of organic compounds from biosolids of Buenos Aires City, Silvana Torri
Como citar este trabajo
Torri S.I., C. Alberti. 2012. Characterization of organic compounds from biosolids of Buenos Aires City, Journal of Soil Science and Plant Nutrition, 12 (1), 143-152
Downward movement of potentially toxic elements in biosolids amended soils,Silvana Torri
Como citar este trabajo
Torri S.I., Corrêa R.S. 2012. Downward movement of potentially toxic elements in biosolids amended soils, Special issue: Biosolids Soil Application: Agronomic and Environmental Implications, Applied and Environmental Soil Science (ISSN: 1687-7667), Volume 2012, Article ID 145724, 7 pages, doi:10.1155/2012/145724.
Potential of Discaria Americana for metal immobilization on soils amended wit...Silvana Torri
Como citar este trabajo
Torri S, Zubillaga M, Cusato M. 2009. Potential of Discaria Americana for metal immobilization on soils amended with biosolid and ash-spiked biosolids. International Journal of Phytoremediation (Taylor & Francis, Inc., 325 Chestnut Street, Suite 800, Philadelphia, PA 19106), 11:1–13, (Print ISSN: 1522-6514; Online ISSN: 1549-7879).
Plant absorption of trace elements in sludge amended soils and correlation wi...Silvana Torri
Como citar este trabajo
Torri S, Lavado R. 2009. Plant absorption of trace elements in sludge amended soils and correlation with soil chemical speciation. Journal of Hazardous Materials, 166: 1459–1465. ISSN: 0304-3894 doi: 10.1016/ j.jhazmat.2008.12.075.
Estimation of leaf area in pecan cultivars (Carya illinoinensis), Silvana Torri
Como citar este trabajo
Torri S, Descalzi C, Frusso E. 2009. Estimation of leaf area in pecan cultivars (Carya illinoinensis), Cien. Inv. Agr. 36:53-58, ISSN 0718-1620. Editorial: Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, Santiago, Chile.
Zn distribution in soils amended with different kinds of sewage sludgeSilvana Torri
Como citar este trabajo
Torri S, Lavado R. 2008 b. Zn distribution in soils amended with different kinds of sewage sludge. Journal of Environmental Management (Elsevier, Amsterdam, The Netherlands), 88: 1571-1579. doi:10.1016/j.jenvman.2007.07.026 ISSN: 0301-4797.
Dynamics of Cd, Cu and Pb added to soil through different kinds of sewage sludgeSilvana Torri
Como citar este trabajo
Torri S, Lavado R. 2008 a. Dynamics of Cd, Cu and Pb added to soil through different kinds of sewage sludge. Waste Management (Elsevier, Amsterdam, The Netherlands), 28: 821-832. ISSN: 0956-053X. doi:10.1016/j.wasman.2007.01.020.
Remediación de suelos contaminados con elementos traza mediante el uso de bio...Silvana Torri
Torri S, Zubillaga M, Lavado RS. 2006. Remediación de suelos contaminados con elementos traza mediante el uso de biosólidos compostados y enmienda calcárea. II) efecto sobre las fracciones de menor biodisponibilidad de Zn. Revista Facultad de Agronomía, UBA. Editorial Facultad de Agronomía (EFA) UBA. Buenos Aires, Argentina. 26: 93-97. ISSN: 0325-9250.
Mineralization of Carbon from Sewage sludge in three soils of the Argentine p...Silvana Torri
Como citar este trabajo
Torri S, Alvarez R, Lavado R. 2003. Mineralization of Carbon from Sewage sludge in three soils of the Argentine pampas. Commun. Soil Sci. and Plant Anal. (Taylor & Francis, Inc., 325 Chestnut Street, Suite 800, Philadelphia, PA 19106) 34 (13-14): 2035-2043. ISSN (impresa): 0010-3624. ISSN (electronica): 1532-2416.
Distribución y disponibilidad de elementos potencialmente tóxicos en suelos r...Silvana Torri
Como citar este trabajo
Torri S, Lavado R. 2002. Distribución y disponibilidad de elementos potencialmente tóxicos en suelos representativos de la provincia de Buenos Aires enmendados con biosólidos. Ciencia del Suelo. 20 (2): 98-109. ISSN 0326-3169.
Environmental impact of biosolids land applicationSilvana Torri
Como citar este trabajo
Torri S, Cabrera M. 2017 Environmental impact of biosolids land application. In: Organic Waste: Management Strategies, Environmental Impact and Emerging Regulations, Editor: M Collins, Nova Science Publishers, Inc., Hauppauge, NY 11788, ISBN: 978-1-53610-936-8, 185-208, 226 pp
Micronutrientes. En: Fertilidad de suelos y fertilización de cultivosSilvana Torri
Torri S, Urricariet A.S, Lavado R. 2015. Micronutrientes. En: Fertilidad de suelos y fertilización de cultivos. García F y Echeverría H. Ediciones INTA, Balcarce, ISBN 978-987-521-565-8, 357-377. 908 p.
Opendatabay - Open Data Marketplace.pptxOpendatabay
Opendatabay.com unlocks the power of data for everyone. Open Data Marketplace fosters a collaborative hub for data enthusiasts to explore, share, and contribute to a vast collection of datasets.
First ever open hub for data enthusiasts to collaborate and innovate. A platform to explore, share, and contribute to a vast collection of datasets. Through robust quality control and innovative technologies like blockchain verification, opendatabay ensures the authenticity and reliability of datasets, empowering users to make data-driven decisions with confidence. Leverage cutting-edge AI technologies to enhance the data exploration, analysis, and discovery experience.
From intelligent search and recommendations to automated data productisation and quotation, Opendatabay AI-driven features streamline the data workflow. Finding the data you need shouldn't be a complex. Opendatabay simplifies the data acquisition process with an intuitive interface and robust search tools. Effortlessly explore, discover, and access the data you need, allowing you to focus on extracting valuable insights. Opendatabay breaks new ground with a dedicated, AI-generated, synthetic datasets.
Leverage these privacy-preserving datasets for training and testing AI models without compromising sensitive information. Opendatabay prioritizes transparency by providing detailed metadata, provenance information, and usage guidelines for each dataset, ensuring users have a comprehensive understanding of the data they're working with. By leveraging a powerful combination of distributed ledger technology and rigorous third-party audits Opendatabay ensures the authenticity and reliability of every dataset. Security is at the core of Opendatabay. Marketplace implements stringent security measures, including encryption, access controls, and regular vulnerability assessments, to safeguard your data and protect your privacy.
Explore our comprehensive data analysis project presentation on predicting product ad campaign performance. Learn how data-driven insights can optimize your marketing strategies and enhance campaign effectiveness. Perfect for professionals and students looking to understand the power of data analysis in advertising. for more details visit: https://bostoninstituteofanalytics.org/data-science-and-artificial-intelligence/
As Europe's leading economic powerhouse and the fourth-largest hashtag#economy globally, Germany stands at the forefront of innovation and industrial might. Renowned for its precision engineering and high-tech sectors, Germany's economic structure is heavily supported by a robust service industry, accounting for approximately 68% of its GDP. This economic clout and strategic geopolitical stance position Germany as a focal point in the global cyber threat landscape.
In the face of escalating global tensions, particularly those emanating from geopolitical disputes with nations like hashtag#Russia and hashtag#China, hashtag#Germany has witnessed a significant uptick in targeted cyber operations. Our analysis indicates a marked increase in hashtag#cyberattack sophistication aimed at critical infrastructure and key industrial sectors. These attacks range from ransomware campaigns to hashtag#AdvancedPersistentThreats (hashtag#APTs), threatening national security and business integrity.
🔑 Key findings include:
🔍 Increased frequency and complexity of cyber threats.
🔍 Escalation of state-sponsored and criminally motivated cyber operations.
🔍 Active dark web exchanges of malicious tools and tactics.
Our comprehensive report delves into these challenges, using a blend of open-source and proprietary data collection techniques. By monitoring activity on critical networks and analyzing attack patterns, our team provides a detailed overview of the threats facing German entities.
This report aims to equip stakeholders across public and private sectors with the knowledge to enhance their defensive strategies, reduce exposure to cyber risks, and reinforce Germany's resilience against cyber threats.
Levelwise PageRank with Loop-Based Dead End Handling Strategy : SHORT REPORT ...Subhajit Sahu
Abstract — Levelwise PageRank is an alternative method of PageRank computation which decomposes the input graph into a directed acyclic block-graph of strongly connected components, and processes them in topological order, one level at a time. This enables calculation for ranks in a distributed fashion without per-iteration communication, unlike the standard method where all vertices are processed in each iteration. It however comes with a precondition of the absence of dead ends in the input graph. Here, the native non-distributed performance of Levelwise PageRank was compared against Monolithic PageRank on a CPU as well as a GPU. To ensure a fair comparison, Monolithic PageRank was also performed on a graph where vertices were split by components. Results indicate that Levelwise PageRank is about as fast as Monolithic PageRank on the CPU, but quite a bit slower on the GPU. Slowdown on the GPU is likely caused by a large submission of small workloads, and expected to be non-issue when the computation is performed on massive graphs.
2. 240 S.I. Torri and M.M. Puelles
dynamics of potentially toxic elements, land application of organic residues
(manures, biosolids) and bioremediation of contaminated soils, with exotic
and native species. She has published 15 papers in specialised journals,
wrote 10 book chapters and is regularly invited to review scientific articles in
scientific journals.
María Mabel Puelles is a Researcher of the Laboratory of Metals and
Inorganic Analysis, Absorption and Emission Atomic Spectrometry and
X-ray Spectrometry, Chemical Centre, National Institute of Industrial
Technology (INTI), Argentina. Her research interests include issues related
to bioavailability and bioaccumulation of metal contaminants associated to
sediments in soil and aquatic systems, toxicity indicator organisms, plant
species, bioremediation techniques, contaminated water and soil recovery
treatment and inorganic analysis instrumental methods.
1 Introduction
Large volumes of organic wastes are produced all over the world, creating a serious
disposal problem and a major source of environmental pollution. Argentina is the second
largest country of Latin America and the Caribbean. According to the 2001 census, the
Metropolitan Area of Buenos Aires (AMBA) is made up of a population of
approximately 12 million people. This makes the AMBA the third largest urban
agglomeration in Latin America, following Mexico City and Sao Paulo. The amounts of
organic materials from Municipal Solid Wastes (MSW), sewage sludge and wastes of
agro-industrial origins have increased exponentially in the last years. As in many other
countries, waste disposal from households and industries is becoming an increasing
concern.
About 1,800,000 metric tons of sewage sludge is annually produced in the City
of Buenos Aires (Torri and Lavado, 2008). Sludge products are aerobically stabilised
and presently discarded in land farming and, to a minor extent, as a soil amendment
on lawns or land filling. However, the unavailability and rising cost of land, together
with public concern over odour and possible groundwater contamination, makes
finding new sites difficult, expensive and impractical. On the other hand, the creation
of the CEAMSE (State Company for Ecological Coordination in the Metropolitan Area)
in 1978 put MSW management on a metropolitan scale with the implementation
of controlled waste disposal methodology where lands have been recovered for
recreational purposes. At present, the waste management system is undergoing
a transition towards a system of urban solid waste recovery and recycling. In this
sense, the city of Buenos Aires has made significant progress regarding its legal
framework. Law 1854/05, also known as the Zero Garbage Law, sets down a schedule
to reduce urban solid waste end disposal, and stipulates a total ban on burying
recyclable material by the year 2020. New laws and regulations have also been
promulgated over the last few years, compelling the industries to reduce and treat
contaminated wastes.
3. Use of vermiculture technology for waste management 241
The recent intensification of agricultural production, agro industries or industries
generates increasing quantities of solid waste, which may constitute a problem of
potential contamination for the population if its management is not correctly
planned (Navarro and Font, 1993). Another important source of biodegradable wastes
is animal breeding. New livestock production systems based on intensification in large
farms produce huge amounts of manure, which has to be managed under appropriate
disposal practices to avoid negative impacts on the environment (Burton and Turner,
2003).
The use of municipal wastes, sewage sludge, compost and farmyard manures as
fertilisers on agricultural soils has been encouraged in many parts of the world
as a sustainable alternative to stockpiling and incineration (Lima et al., 2009). Land
application of organic wastes is generally considered the best option of management
because it offers the possibility of recycling plant nutrients, provides organic material to
the soil and improves the soil’s aggregate stability, porosity and water infiltration rate
(Weber et al., 2007). However, recycling initiatives in Argentina are still incipient.
Direct land application of untreated waste might result in nitrogen immobilisation,
phytotoxicity due to release of ammonia, low molecular weight organic acids or salts
(Cooperband, 2000; Torri and Lavado, 2009). Consequently, organic materials
should be treated appropriately before being land applied. The conventional and
most traditional method of composting consists of an accelerated bio-oxidation of the
organic matter as it passes through a thermophilic stage (45–65°C) where
microorganisms liberate heat, carbon dioxide and water (Domínguez et al., 1997).
However, in recent years, researchers have become progressively interested in using
another biological process for stabilising organic wastes, which does not include a
thermophilic stage, but involves the use of earthworms. Certain species of earthworms
can rapidly fragment organic material residuals into much finer particles by passing them
through a grinding gizzard, an organ that all Anellida possess (Ndegwa and Thompson,
2001). The earthworm species most commonly utilised for the breakdown of organic
wastes are Eisenia fetida (Savigny) and its related species Eisenia andrei (Bouché).
Worldwide, considerable work has been carried out on vermicomposting of various
organic materials such as animal dung, agricultural waste and food wastes (Singh and
Sharma, 2002). Similarly, industrial and distillery wastes have been vermicomposted and
turned into nutrient-rich manure (Suthar, 2007). In Argentina, Campitelli and Ceppi
(2008b) studied the chemical and physicochemical properties of humic acids
from different vermicomposting plants that used different raw materials, like mixtures of
sorghum and tomato, urban waste, chicken manure, soybean and bagasse. They
concluded that carbon content of humic substances was similar in all the organic
amendments studied, whereas carbon content of humic acids apparently increased
with vermicomposting time. These results suggest that long stabilisation processes
led to the mineralisation of easily degradable fractions and the appearance of larger
concentration of more recalcitrant molecules like humic acids. Although this technique
has been tried and tested in many countries with positive results, vermicomposting is still
a relatively new technology in Argentina, and has not yet been fully explored.
Nonetheless, numerous organic wastes have been studied as possible substrates, and the
vermicompost obtained was tested for plant growth.
4. 242 S.I. Torri and M.M. Puelles
On the other hand, earthworms are relatively efficient accumulators of certain
essential and non-essential trace elements from soil and sediments, either through direct
dermal contact with chemicals in the soil solution or soil atmosphere and by ingestion of
bulk soil or specific soil fractions (Lanno et al., 2004). Van Hook (1974) claimed that
earthworms could serve as useful biological indicators of contamination because of the
fairly consistent relationships between the concentrations of certain contaminants
between earthworms and soils. Earthworms may also be used to reclaim contaminated
soils. Vermiremediation is especially relevant in acidic soils, because of the near-neutral
to alkaline pH of vermicompost and the suppression of labile aluminium (Mitchell and
Alter, 1993). There are no records of soil surface polluted areas in Argentina.
Nevertheless, some bioassays were performed to determine the uptake and
bioaccumulation of trace elements by some worms.
In this paper, the authors compile the research results of vermicomposting, of organic
residues and of bioaccumulation of some trace elements by worms in artificially
contaminated systems, to provide a general outlook of the development of vermiculture
technology in Argentina within the last decade.
2 Vermiculture technology for waste management
2.1 Type of waste
2.1.1 Municipal Solid Waste (MSW)
The organic composition of MSW ranges between 40% and 60%, although this
composition may change according to the region considered. In general, rural households
generate more organic waste than urban households. The end product quality of
traditional composts and vermicomposts using MSW produced in the NW Patagonia
region was compared by Tognetti et al. (2005). The earthworm used was Eisenia fetida.
Two kinds of vermicompost were prepared: inoculated with earthworms after having
undergone a two-month maturity phase and a backyard vermicompost produced during
four months without a previous thermophilic phase. Tognetti et al. (2005) reported that
Electrical Conductivity (EC) of municipal compost and municipal vermicompost was
within the range considered acceptable for plant growth, being significantly lower for
vermicompost compared with traditional compost and backyard vermicompost. The three
composts had alkaline pH values, probably due to the high wood ash content of the
MSW. Total N and P were significantly higher in municipal vermicompost than
in municipal compost, whereas organic matter content did not significantly differ
between the three amendments. When compost and vermicomposts were applied to
degraded soil and sown with ryegrass, significantly higher ryegrass aerial biomass
was produced with vermicompost, which increased ryegrass yield by 15–17% compared
with the traditional compost and backyard vermicompost. These results may have been
due to enhanced soil microbial activity, population size and substrate degradation
capacity, indicating the importance of the processing technology employed (Gaur and
Singh, 1995).
5. Use of vermiculture technology for waste management 243
2.1.2 Sewage sludge
In Buenos Aires City, sludge products are aerobically stabilised in two treatment plants
(North and South-western purifying plants) and are presently discarded in land farming,
and to a minor extent as a soil amendment on lawns or land filling. Composting in a large
scale is not yet performed mainly due to a lack of economic investment. The management
of sewage sludge through the action of earthworms has been suggested for depuration
plants (Masciandaro et al., 1997) as an option for resource recovery. The contents of Cd,
Cu and Pb in sewage sludge do not exceed ceiling concentrations for land application
recommended by Argentine regulation (S.A.D.S., 2001, Res.97/01) and the US EPA
(US EPA, 1993; Torri and Lavado, 2008). This option is actually being studied by the
author.
2.1.3 Manure
The feeding of livestock in confinement is progressively increasing in Argentina.
This activity generates large volumes of organic waste that may create a serious
disposal problem and a major source of environmental pollution. Composting of animal
manures has been traditionally carried out by the farmers after manure collection for
better handling, transport and management. However, the cost of composting can be
considerably higher than its direct utilisation. Recycling of manure as vermicomposting is
a promising strategy of agronomical, economical and ecological importance.
The characteristics of vermicomposting derived from manures of different origin have
been investigated in the last years. Ullé et al. (2003) studied in San Pedro, Buenos
Aires province, the characteristics of cow manure, bed-of-chicken, pig manure
and horse manure as raw organic wastes, composted and vermicomposted by Eisenia
foetida after a thermophilic phase (US EPA 40 CFR Part 503). Giulietti et al. (2008)
also studied vermicompost originated from cow, horse, goat and hen feces in San Luis
province whereas Campitelli et al. (2008) evaluated the quality of vermicomposted
rabbit manure in Cordoba province. Caprines for milk and meat production are
a key source of income for rural families in Santiago del Estero province, with 15% of
the national production. González et al. (2008) compared traditionally composted
and vermicomposted goat, horse and cow manures. Physicochemical properties
for fresh manures, traditionally composted and vermicomposted manures are summarised
in Table 1.
The pH value is one of the most frequent parameters used to characterise composted
and vermicomposted materials. Several legislations suggest pH values ranging from
6.0 to 8.5 for this kind of organic amendments to ensure compatibility with most plants
(Hogg et al., 2002). The pH of the vermicomposted products was, in general, lower
compared with fresh manures, presumably due to the production of carbon dioxide, initial
volatilisation of ammonia and the production of organic acids by microbial activity
during vermicomposting (Elvira et al., 1998). The pH of all vermicomposts ranged from
neutral to alkaline. Possible contributions to the near-neutral pH of vermicompost may be
the secretion of ammonium and the activity of calciferous glands in earthworms.
These glands contain carbonic anhydrase, which catalyse the fixation of dioxide and
calcium carbonate, thereby preventing the fall in pH (Kale et al., 1982; Lee, 1985).
6. 244 S.I. Torri and M.M. Puelles
Table 1 Nutrient contents and some properties of raw, composted and vermicomposted
manure
Manure pH EC OM (%) Nt (%) K (%)
C : N
ratio
P
(mg kg–1
) References
Raw 9.11 5.58 59.8 2.4 2.30 1,2
Composted 8 3.7 44.2 1.74 3.24 1,2
7.7 1.2 31.5 1.19 0.43 15 : 1 1,2
Poultry
Vermicomposted
8.2 15.82 0.84 400 3
Raw 9.28 26.2 1.17 0.45 1,2
6 1.5 22.5 1.08 1.30 1,2Composted
7.2 7.3 14 11 6
6.7 0.7 20.4 0.93 0.40 10 : 1 1,2
6.6 13.18 0.7 139.9 3
6.7 29.71 1.25 0.11% 32 5
Cow
Vermicomposted
6.8 14.6 15 13 6
Raw 4.87 53.6 1.53 1.81 1,2
8.5 1.7 23.0 1.21 3.06 1,2Composted
7.0 11.8 11.5 6
8 0.8 31.0 0.85 0.52 14 : 1 1,2
6.7 23.44 1.23 208.9 3
Horse
Vermicomposted
7.0 13.3 11 6
Raw 5.69 47.3 2.25 1.17 1,2
Composted 7 2.5 28.3 1.45 1.22 1,2
Hog
Vermicomposted 7.3 1.6 29.9 1.05 0.23 11 : 1 1,2
Raw 7.0 53.0 1.22 0.52 6
Composted 7.6 11.7 11.7 13 6
10.88 0.09 35.99 3
Goat
Vermicomposted
7.6 15.0 15.0 11 6
Raw 9.23 1.78 62 2.06 4
Composted 9.15 2.43 40.3 1.49 4
Rabbit
Vermicomposted 8.51 2.65 37.9 1.42 4
EC: Electrical Conductivity; OM: Organic Matter; Nt: total nitrogen; K: potassium;
C : N: carbon : nitrogen; P: phosphorus.
1: Ulle et al. (2004); 2: Ulle et al. (2005); 3: Giulietti et al. (2008); 4: Campitelli and
Ceppi (2008); 5: Castillo et al. (2005); 6: González et al. (2008).
EC is another parameter to be considered. Salts in fresh manure tend to be high (Table 1).
The EC in the final product greatly depends on the raw material used for
vermicomposting, in agreement with Atiyeh et al. (2000). Lasaridi et al. (2006) suggested
that the maximum EC value should be 4 dS/m, which is considered tolerable by plants of
medium sensitivity for salinity. Among the vermicomposts produced, all of them except
those derived from rabbit manure had lower EC values than traditional composts.
7. Use of vermiculture technology for waste management 245
Total N content was lower in all vermicomposts analysed than the corresponding
composts or fresh manure. Although microorganisms are largely responsible of organic
matter decomposition, and ammonia volatilisation, earthworms may directly affect
the rates of decomposition by digesting organic matter and feeding microorganisms,
or indirectly involving stimulation or depression of microbial populations (Lavelle and
Spain, 2001). Total N content in vermicompost ranged between 7 and 23 g kg–1
, in good
agreement with data reported by Elvira et al. (1998).
The C/N ratios for vermicomposts of different origin were relatively high. The actual
ratio obtained depended on the composition of the original material. A C/N ratio
of 10–12 is considered an indicator of stability (Jimenez and Garcia, 1992). Lee (1985)
indicated that earthworms ingest and re-ingest available organic matter. However,
earthworms do not ingest all the plant litter, dung or other organic material that
they move.
These results indicate that vermicomposts from different raw material and time
of process may differ in its quality, as reported by Goyal et al. (2005) and Zmora-Nahum
et al. (2007). Few attempts have been made to find and define properties, which can be
useful to assess end-quality for composts of varying sources and from various facilities.
Campitelli and Ceppi (2008a) have proposed a statistical methodology for the
classification of organic amendment from different sources. The multivariate technique
was carried out using Principal Component Analysis (PCA) and typical classification
techniques (LDA) by determining parameters related to physical, chemical and
biological characteristics of composts, including: pH, Total Nitrogen (TN), Total
Organic Carbon (TOC), Water-Soluble Carbon (WSC), Germination Index (GI),
TOC/TN and WSC/TN. Through the use of statistical techniques, organic amendments
were classified in the categories A, B1, B2, B3 and C, according to stability, maturity and
quality characteristics.
2.1.4 Industry wastes
Industries produce huge quantities of liquid and solid wastes, resulting in sludge
generation. Economical and ecologically acceptable disposal of industrial sludge is
becoming a great challenge to industries, due to the high cost of sludge stabilisation
reactors, dehydration systems and transportation to disposal sites. Food processing has
emerged as one among the most important industrial activities in recent years. Industrial
wastes that are rich in organic matter and free from toxic elements or substances may be
suitable substrates for vermicomposting (Yadav and Garg, 2009). Transformation
of industrial sludge into vermicompost is of double interest: on the one hand, the waste
is converted into a valuable product, and, on the other, it controls a pollutant that is a
consequence of increasing industrialisation. Several research has been conducted on the
potential use of Eisenia fetida earthworm in nutrient recovery from industrial sludges,
including organic residues from fruits and vegetables (Sánchez de Pinto et al., 2006),
carnic and tobacco wastes (Altamirano and Zankar, 2008), fish offal (Laos et al., 2002);
lemon pulp waste (Navarro et al., 2009); rice hulls (Leconte et al., 2009) and puffed rice
scrap (Schuldt et al., 2005). Laos et al. (2000) reported that during the composting period,
values of total nitrogen, total organic carbon, total organic carbon: total nitrogen ratio,
and pH did not show a clear trend, whereas in most cases EC, ammonium as nitrogen
(NH4
+
–N) and volatile fatty acids decreased significantly.
8. 246 S.I. Torri and M.M. Puelles
The results obtained in all cases confirm that vermicomposting may transform
solid residue into a commercially valuable organic amendment under controlled
conditions.
2.2 Use of vermicompost as a biofertiliser
There is scientific evidence that vermicompost can significantly influence the growth and
productivity of plants (Edwards, 1998). Various greenhouse and field studies have
examined the effects of a variety of vermicomposts on a wide range of crops
including perennial grasses, like Digitaria eriantha (Giulietti et al., 2008); vegetables,
like tomato seedlings, Cv. platense (Valenzuela and Gallardo, 1997) and Lycopersicon
esculentum Mill. (Premuzic et al., 1998); lettuce, Lactuca sativa L. (Chiesa et al., 2006;
Coria-Cayupán et al., 2009), cv Marianella (Ullé et al., 2005) and cabbage,
Brassica oleracea (Cracogna et al., 2008); ornamental and flowering plants, like basil
seedlings, Ocimum basilicum L. var. Catamarca (Cabanillas et al., 2006), Impatiens
walleriana (Asciutto et al., 2006); field crops, like garlic, Allium sativum L. (Argüello
et al., 2006).
The use of vermicompost as biofertilisers produced an increase in yields in
horticultural crops both in fresh and in dry matter (Spiaggi et al., 2001; Coria-Cayupán
et al., 2009). The growth response of lettuce cv Marianella was evaluated in plots where
four vermicomposted manures (poultry litter, cattle, horse bed and swine) were applied at
similar rates (Ullé et al., 2005). All treatments rendered plants with higher average plant
weight compared with unamended control, though average weight was significantly
higher in the poultry litter vermicompost amended soil than in the rest of the treatments.
Similarly, lettuce crop yield significantly increased and an enrichment in its pigment
contents was observed when vermicomposts produced through the processing of cattle
manures, agro-industrial organic wastes were applied (Coria-Cayupán et al., 2009).
However, antioxidant value and phenolic levels were reduced in some cases. Some other
authors concluded that vermicompost contain humified organic matter characterised by
high molecular weight and an enzymatically active humic fraction, which has been
found to possess phytohormonal properties that stimulate plant germination and growth
(Garcia et al., 1992; Dell’Amico et al., 1994). The use of vermicompost as amendments
to reduce soilborne pathogen diseases is gaining the interest of plant pathologists,
manufacturing and processing industries, regulators, consumers and growers (Lazarovits
et al., 2001). The results obtained by Rivera et al. (2004) confirm that vermicomposts can
be included in the development of effective alternatives to control tomato damping-off.
In addition, it may be a tool to promote seedlings growth.
On the other hand, this organic material has large particulate surface areas
that provide many micro-sites for microbial activity and for the strong retention of
nutrients (Shi-wei and Fu-Zhen, 1991). Vermicompost contains nutrients in plant
available form such as nitrates, phosphates and exchangeable calcium and soluble
potassium (Edwards, 1998). The availability of P in vermicompost is often significantly
greater than in bulk soil. This can be attributed to the quantities of phosphorus
ingested by earthworms in the organic matter they consume, which pass through
the intestine and is afterwards excreted. Some authors believe that the greater release
9. Use of vermiculture technology for waste management 247
of P from casts is due to enhanced microbial activity (Lee, 1985; Scheu, 1987),
while others suggest it is due to increased phosphatase activity (Lavelle and Martin,
1992).
The use of vermicompost as a peat substitute in greenhouses has also been proposed.
Valenzuela and Gallardo (1997) evaluated the growth of tomato seedlings (cv Platense)
in mixtures of different proportions of soil and vermicompost. They reported that total
nitrogen, extractable phosphorus, available potassium and soluble salts increased
as the proportion of vermicompost increased in the mixture. These authors concluded
that EC values of 2.07 dS/m, corresponding to a 2 : 3 mixture of vermicompost and
soil, negatively affected tomatoes (cv Platense) seedlings growth. On the contrary,
Premuzic et al. (1998) reported that tomatoes L. esculentum Mill. grown in a glasshouse
on vermicompost or on a 1 : 1 mixture of vermicompost and soil had significantly
higher weight, number of fruits, and contained significantly more Ca, C vitamin and
less Fe than fruits grown on a hydroponic inorganic media. However, P and K content
in L. esculentum Mill. did not significantly differ from vermicompost or hydroponic
inorganic substrates. Arguello et al. (2006) reported that the use of a 1 : 1 mixture of
vermicompost and soil as a substrate caused early bulbing and lengthened bulb filling
period in ‘Rosado Paraguayo’ garlic bulbs. The treatment with vermicompost also
increased scorodose accumulation, resulting in greater yield and bulb quality.
2.3 Use of vermicompost in urban agriculture
Vermiculture was introduced in the Empalme Graneros neighbourhood of Rosario
City, Santa Fe province, in 2001. The project was based on international experience
of urban agriculture to lessen to some degree the food problems that large sectors
of this community were facing. One of its objectives was to introduce large-scale
vermiculture as an appropriate technology for processing organic waste and producing
biofertiliser in productive urban agriculture systems. Trials with fluid and standard
vermicompost were performed with tomato (L. esculentum var. platense), aromatic
and medicinal plants. An increase in the number and weight of fruit was observed
with the use of fluid and standard vermicompost. Thus, vermiculture resulted in an
appropriate biotechnology for transforming waste into an input at a small to
medium scale. Moreover, its low cost and simple handling made it available to
small producers and urban inhabitants with few financial resources (Spiaggi, 2005).
Actually, this community transforms about 6 t of organic waste per year in 2.6 t of
vermicompost.
3 Use of vermiculture technology in environmental remediation
Most contaminants that are discharged to aquatic environments have the tendency to bind
to sediment particles (Alcock et al., 2002; Zheng et al., 2008). Nriagu and Simmons
(1984) reported that about 60% of the metal present in aqueous systems is bound to
sediments. Sediment-bound contaminants may pose a particular risk to the whole aquatic
system, for they may be released by desorption, increasing their concentrations in the
aqueous phase, or may be ingested by benthic organisms and released into the
10. 248 S.I. Torri and M.M. Puelles
gastrointestinal tract of the animal (Chapman et al., 2002). The impact of these pollutants
range from simple nuisance substances to severe ecological impacts, involving fish, birds,
mammals and human health. Thus, in situ remediation processes have to be conducted to
reduce contaminants to an acceptable level.
The Matanza-Riachuelo River is located in the province of Buenos Aires, and is the
most contaminated river basin in Argentina and in Latin America (Olson et al., 1998).
This river has been used as a sewage destination since the colonial years, and throughout
the centuries pollution levels have steadily increased along with industrialisation.
The basin, with an area of 2,200 km2
, is also home to Argentina’s largest population of
poor communities. Overall, the industrial facilities located along the watershed can be
characterised by use of old-fashioned technology and low levels of pollution control.
Usually, existing treatment facilities do not work well, and environmental compliance
is extremely low. Nonetheless, the government of Argentina, through the Secretary of
Environment and Sustainable Infrastructure (SAyDS), has made the Matanza-Riachuelo
problem the top-priority in its environmental agenda.
The complex mixture resulting from industrial effluents, municipal wastewaters, and
landfill leachates dumped into the Riachuelo River are mainly accumulated into the river
sediments. An experimental model based on the use of artificial particles as analogues of
natural sediments has been proposed to investigate the bioavailability and
bioaccumulation of several organic chemicals bound to sediments (Verrengia Guerrero
et al., 2001; Verrengia Guerrero et al., 2003). Lumbriculus variegates is a freshwater
oligochaete that feeds on sediments. This species has been recommended and widely
adopted as standard organism for bioaccumulation studies and toxicity tests (Phipps et al.,
1993; US EPA, 1994; ASTM, 1995). Moreover, numerous researchers investigated the
bioavailability and bioaccumulation of trace elements by L. variegates using these
artificial particles. Miño et al (2006) studied the uptake and bioaccumulation of lead (Pb);
Piol et al. (2006) used these artificial particles with and without humic acid to investigate
the bioavailability and bioaccumulation of cadmium (Cd) whereas Puelles et al. (2008)
exposed worms to a mixture of Cd and Pb in the presence of artificial particles with sizes
in the range of 40–60 µm, to ensure worms’ ingestion.
The main pathways for chemical absorption are dermal uptake for soluble elements,
and gut and digestion for the insoluble ones (Weltje, 1998). Becquer et al. (2005)
concluded that the ingestion of metals bound to soil components followed by their
cellular assimilation are likely to be the most important pathway for metals to enter the
body tissue of invertebrates, whereas dermal uptake of dissolved ions is less important,
except perhaps for Cd. Both studied elements accumulation were abnormally high in
water (Puelles et al., 2008). These results were explained because, in the absence of
particulate matter, L. variegates was unable to burrow and was probably more
stressed and mobile than they would be in a natural situation, leading to a higher
accumulation than expected, as it was previously observed by Miño et al. (2006).
In this way, Lumbriculus variegates species can accumulate Cd and Pb, when these
elements are in aqueous phase, or when Cd and Pb are bound to minerals or organic
compounds by ingestion, as simulated with the artificial particles. The results obtained by
Miño et al. (2006), Piol et al. (2006) and Puelles et al. (2008) suggest that L. variegates
may be potentially used as a bioindicator organism to reduce inorganic pollution in
aquatic sediments.
11. Use of vermiculture technology for waste management 249
4 Conclusion
The experiments reported in Argentina have substantiated the feasibility of utilisation
of different kinds of waste (MSW, manure and industry wastes) for vermicomposting.
In this way, solid residues that cause economic and environmental problems may be
transformed into a commercially valuable organic amendment under controlled
conditions. Amending soils with vermicompost increased the growth and yield
of some horticultural crops, ornamental and flowering plants. Nonetheless,
the availability of trace elements in vermicompost has to be carefully studied.
Vermiremediation studies are incipient in Argentina. Nevertheless, research on
L. variegates suggest that this species may be potentially used to reduce inorganic
pollution in marine sediments.
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