This document summarizes a laboratory experiment that investigated the effects of hydraulic retention time (HRT) on root oxygen release and pollutant removal in subsurface flow constructed wetlands. The experiment found that average root oxygen release was higher at a 7 day HRT (36.9 μmol/gDW/hr) than a 3.5 day HRT (19.5 μmol/gDW/hr). Average removal efficiencies of biochemical oxygen demand, ammonium, and total nitrogen were not significantly different between the two HRTs. However, the average nitrate removal efficiency was higher at a 3.5 day HRT (86%) than a 7 day HRT (60.5%), indicating that shorter HRTs
Review on Study of Lake Water Using Multi Sensor Remote Sensing DataIOSR Journals
Abstract : In this paper multi sensor satellite data i.e. IRS LISS III or Landsat TM/ETM+ or OCEANSAT-
1(IRS-P4) consisting of an Ocean Color Monitoring operating in eight spectral band data are used for
extracting information useful to hydrological projects such as monitoring the water quality of lakes. Changes of
the area extent of the lakes are estimated from the multitemporal satellite images. Surface water temperature
patterns of the lakes are mapped and anomalies are identified. Emphasis is given on the investigation of
capabilities of IRS LISS III or Landsat TM/ETM+ or OCEANSAT-1(IRS-P4) data in monitoring water quality of
lakes. A classification scheme regarding various water quality parameters (Secchi depth, Turbitidity,
Chlorophylle –α and Total Total phosphorus) is created based on combinations of different bands.
Influence of Sulfate, Phosphate, Ammonia and Dissolved Oxygen on Biochemical ...BRNSS Publication Hub
The present study was done to ascertain the level biochemical oxygen demand (BOD) of Marlimund Lake situated in Ooty how it is related with the other parameters such as water temperature, dissolved oxygen, phosphate, sulfate, iron, and free ammonia. Four sampling sites were selected and studied over the period of 13 months from February 2016 to February 2017. The results were computed by best model fits applied for calculation using Curve Expert Version 4.2. The water temperature ranged from 8.1°C to 18.7°C, dissolved oxygen 3.468–6.976 mg/l, phosphate 0.1–1.92 mg/l, sulfate 1–18 mg/l, free ammonia 0.12–6.01 mg/l, and BOD 2.178–5.040 mg/l. BOD was found to be significantly related to dissolved oxygen (r = 0.5690291) by 4th degree polynomial fit, phosphate (r = 0.7095253) by rational function fit and free ammonia (r = 0.7395016) by MMF model fit, respectively. Sulfate was found to be nonsignificant (r = 0.2565396) by geometric fit model, and water temperature (r =0.4595060) shows a sinusoidal fit.
Study on Physico- Chemical Parameters of Waste Water Effluents from Kombolcha...AI Publications
The physicochemical parameters of wastewater collected from five sampling sites were investigated. These parameters were analyzed by standard methods. The pH of the waste water varied from 4.7 to8.2, while the waste water conductivity ranges from 1205.3 to 7130.17 µScm−1. The maximum total dissolved solid was 8100mg/l.and the maximum biological oxygen demand was 2763.35 mg/l. The chemical oxygen demand of the selected samplesites varied widely (772.56–3105.13 mg/l), the nitrate content was found to be maximum insample W5 (166.00mg/l), and the sulfate content was found to be high in samples W1 andW5 (500and 4875mg/l). The chloride and sulphied contents were maximum atsamplesof W3 and W5 their concentrations were8543.45 and 10.7mg/lrespectively. Thephysicochemicalparameters studied in this work were varied between the samplesand almost all parameters studied were higher compared with the permissible limit prescribed by the United States Environmental Protection Agency and World Health Organization.
The Influence of Vermiculite on the Uptake of Silver Nanoparticles in a Terre...Agriculture Journal IJOEAR
— The uptake of silver from silver nanoparticles in soil was investigated in the presence of increasing concentrations of Vermiculite, typical 2:1 clay. Two insect species, Acheta domesticus and Tenebrio molitor, and two plant species, Helianthus annuus and Sorghum vulgare, were exposed to silver nanoparticles in the presence of increasing concentrations of Vermiculite in soil. Silver nanoparticles were characterized using techniques including transmission electron microscopy, dynamic light scattering, and powder X-ray diffraction. The levels of silver in test species exposed to silver nanoparticles were measured using an inductively coupled plasma-optical emission spectrometer. An increase in the cation exchange capacity of soil was observed with the increase in the concentration of vermiculite in soil. The results suggested a decrease in the uptake of silver from silver nanoparticles in soil by Acheta domesticus as a function of increasing concentrations of Vermiculite in soil. No apparent trend was observed in the remaining species. Both plant species were found to accumulate silver in their roots. The translocation of silver to stems and leaves was observed in the case of Helianthus annuus. Results from this study suggest that the presence of Vermiculite in soil could possibly decrease the uptake of silver from silver nanoparticles.
Review on Study of Lake Water Using Multi Sensor Remote Sensing DataIOSR Journals
Abstract : In this paper multi sensor satellite data i.e. IRS LISS III or Landsat TM/ETM+ or OCEANSAT-
1(IRS-P4) consisting of an Ocean Color Monitoring operating in eight spectral band data are used for
extracting information useful to hydrological projects such as monitoring the water quality of lakes. Changes of
the area extent of the lakes are estimated from the multitemporal satellite images. Surface water temperature
patterns of the lakes are mapped and anomalies are identified. Emphasis is given on the investigation of
capabilities of IRS LISS III or Landsat TM/ETM+ or OCEANSAT-1(IRS-P4) data in monitoring water quality of
lakes. A classification scheme regarding various water quality parameters (Secchi depth, Turbitidity,
Chlorophylle –α and Total Total phosphorus) is created based on combinations of different bands.
Influence of Sulfate, Phosphate, Ammonia and Dissolved Oxygen on Biochemical ...BRNSS Publication Hub
The present study was done to ascertain the level biochemical oxygen demand (BOD) of Marlimund Lake situated in Ooty how it is related with the other parameters such as water temperature, dissolved oxygen, phosphate, sulfate, iron, and free ammonia. Four sampling sites were selected and studied over the period of 13 months from February 2016 to February 2017. The results were computed by best model fits applied for calculation using Curve Expert Version 4.2. The water temperature ranged from 8.1°C to 18.7°C, dissolved oxygen 3.468–6.976 mg/l, phosphate 0.1–1.92 mg/l, sulfate 1–18 mg/l, free ammonia 0.12–6.01 mg/l, and BOD 2.178–5.040 mg/l. BOD was found to be significantly related to dissolved oxygen (r = 0.5690291) by 4th degree polynomial fit, phosphate (r = 0.7095253) by rational function fit and free ammonia (r = 0.7395016) by MMF model fit, respectively. Sulfate was found to be nonsignificant (r = 0.2565396) by geometric fit model, and water temperature (r =0.4595060) shows a sinusoidal fit.
Study on Physico- Chemical Parameters of Waste Water Effluents from Kombolcha...AI Publications
The physicochemical parameters of wastewater collected from five sampling sites were investigated. These parameters were analyzed by standard methods. The pH of the waste water varied from 4.7 to8.2, while the waste water conductivity ranges from 1205.3 to 7130.17 µScm−1. The maximum total dissolved solid was 8100mg/l.and the maximum biological oxygen demand was 2763.35 mg/l. The chemical oxygen demand of the selected samplesites varied widely (772.56–3105.13 mg/l), the nitrate content was found to be maximum insample W5 (166.00mg/l), and the sulfate content was found to be high in samples W1 andW5 (500and 4875mg/l). The chloride and sulphied contents were maximum atsamplesof W3 and W5 their concentrations were8543.45 and 10.7mg/lrespectively. Thephysicochemicalparameters studied in this work were varied between the samplesand almost all parameters studied were higher compared with the permissible limit prescribed by the United States Environmental Protection Agency and World Health Organization.
The Influence of Vermiculite on the Uptake of Silver Nanoparticles in a Terre...Agriculture Journal IJOEAR
— The uptake of silver from silver nanoparticles in soil was investigated in the presence of increasing concentrations of Vermiculite, typical 2:1 clay. Two insect species, Acheta domesticus and Tenebrio molitor, and two plant species, Helianthus annuus and Sorghum vulgare, were exposed to silver nanoparticles in the presence of increasing concentrations of Vermiculite in soil. Silver nanoparticles were characterized using techniques including transmission electron microscopy, dynamic light scattering, and powder X-ray diffraction. The levels of silver in test species exposed to silver nanoparticles were measured using an inductively coupled plasma-optical emission spectrometer. An increase in the cation exchange capacity of soil was observed with the increase in the concentration of vermiculite in soil. The results suggested a decrease in the uptake of silver from silver nanoparticles in soil by Acheta domesticus as a function of increasing concentrations of Vermiculite in soil. No apparent trend was observed in the remaining species. Both plant species were found to accumulate silver in their roots. The translocation of silver to stems and leaves was observed in the case of Helianthus annuus. Results from this study suggest that the presence of Vermiculite in soil could possibly decrease the uptake of silver from silver nanoparticles.
pH effects on the adsorption of saxitoxin by powdered activated carbonhbuarque
Increasing occurrence of cyanotoxins in surface waters worldwide pose significant problems, including
those for drinking water utilities. In this study, the removal of saxitoxin (STX) from three different
powdered activated carbons (PACs) was studied. STX is one of the most toxic paralytic shellfish toxins
(PSTs), albeit not the most prevalent. The results showed that a wide range of non-electrostatic and
electrostatic interactions appeared to play a role in the sorption of STX on PAC, depending on the solution
pH, NOM concentration, and other factors. A bituminous coal-based PAC, that was studied in greatest
detail, showed a trend of increasing sorption capacity for STX with increasing pH. NOM appeared to
significantly inhibit adsorption when the pH was nearly neutral (e.g. 7.05), yet it had less effect at higher
pH levels of 8.2 and 10.7.
The present study intended to compare the efficiency of the wetland plants Phragmites australis (cav.)
Trin. ex Steudel and Cyperus papyrus L. for the accumulation of heavy metals. Maximum accumulation
of the heavy metals Pb (132.5-175 μg/g DW), Zn (97.5-100 μg/g DW) and Cr (80.5-90 μg/g DW) was
recorded in roots of the two wetland plants C. papyrus and P. australis, respectively. Cadmium showed
the lowest metal accumulation in the tissues of both plants (0.55-5.5 μg/g DW). C. papyrus roots
accumulated higher levels of most metals than those of P. australis. Heavy metals were shown to be not
only accumulated in roots of both plants but also were translocated to the shoots and accumulated in the
harvestable plant parts. The results showed variation in the levels of the heavy metals accumulated in the
different parts of C. papyrus and P. australis, in spite of being planted at the same site and subjected to
the same conditions. The potential use of Phragmites australis and Cyperus papyrus in phytoremediation
is also discussed.
Artifi cial wetlands are useful for wastewater treatment; however, relatively little is known of the effects of sewage on artifi cial wetland microbial community structure. Therefore, we assessed the effect of municipal sewage on microbial community diversity in surface water throughout an artifi cial wetland (Xiantao artifi cial wetland) treating municipal sewage. We analyzed the relationship between physicochemical parameters of surface water (i.e., Chemical Oxygen Demand (COD), Total Nitrogen (TN), Total Phosphorus (TP), and
NH4+-N) with microbial community structure (Illumina MiSeq sequencing followed by abundance indices). The results showed that the total microbial community in surface water was signifi cantly correlated with COD, TN, TP, and NH4
+-N (r = 0.764, 0.897, 0.883, 0.839, P < 0.05). In addition, the most abundant taxa were significantly correlated with COD (r = 0.803, P < 0.05). The relative abundance of rare operational taxonomic units in the more purifi ed water farther downstream was higher than in the polluted area, suggesting that rare groups were more sensitive to physicochemical parameters than abundant groups, and that the abundance of some bacteria could indirectly indicate the degree of aquatic pollution. Our results indicate that the responses of microorganisms in artificial wetlands to environmental conditions should be considered to ensure efficient treatment.
A Survey on the Analysis of Dissolved Oxygen Level in Water using Data Mining...IIRindia
Data Mining (DM) is a powerful and a new field having various techniques to analyses the recent real world problems. In DM, environmental mining is one of the essential and interesting research areas. DM enables to collect fundamental insights and knowledge from massive volume of environmental data. The water quality is determining the condition of water in the environment. It represents the concentration and state (dissolved or particulate) of some or all the organic and inorganic material present in the water, together with certain physical characteristics of the water. The Dissolved Oxygen (DO) is one of the important aspects of water quality. The DO is the quantity of gaseous oxygen (O2) incorporated into the water. The DO is essential for keeping the water organisms alive. The amount of DO level in the water can be detected by various methods. The data mining techniques are properly used to find DO Level in the different types of water. A number of DM methods used to analyze the DO level such as Multi-Layer Perceptron, Multivariate Linear Regression, Factor Analysis, and Feed Forward Neural Network. This survey work discusses about such type of methods, particularly used for the analysis of DO level elaborately.
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
This presentation discusses the measurement of PFCs in drinking and tap water using LC-MS/MS. As contaminants of emerging concern, research on PFCs is ongoing to determine the impacts of these materials on human health and the environment. Perfluorinated compounds can be effectively and quickly measured directly from surface and drinking water using a modified configuration of the LCMS-8050. For more information, go to ssi.shimadzu.com and follow Shimadzu on Twitter @ShimadzuSSI. Thanks for viewing.
his study investigated the microbial community in a full scale anaerobic baffled reactor and sequencing batch reactor system for oil-produced water treatment in summer and winter. The community structures of fungi and bacteria were analyzed through polymerase chain reaction–denaturing gradient gel electrophoresis and Illumina high-throughput sequencing, respectively. Chemical oxygen demand effluent concentration achieved lower than 50 mg/L level after the system in both summer and winter, however, chemical oxygen demand removal rates after anaerobic baffled reactor treatment system were significant higher in summer than that in winter, which conformed to the microbial community diversity. Saccharomycotina, Fusarium, and Aspergillus were detected in both anaerobic baffled reactor and sequencing batch reactor during summer and winter. The fungal communities in anaerobic baffled reactor and sequencing batch reactor were shaped by seasons and treatment units, while there was no correlation between abundance of fungi and chemical oxygen demand removal rates. Compared to summer, the total amount of the dominant hydrocarbon degrading bacteria decreased by 10.2% in anaerobic baffled reactor, resulting in only around 23% of chemical oxygen demand was removed in winter. Although microbial community significantly varied in the three parallel sulfide reducing bacteria, the performance of these bioreactors had no significant difference between summer and winter.
The Effects of Pipe Material and Age on the Formation of Disinfection By – Pr...
IPWE2016-000048
1. 8th
International Perspective on Water Resources and the Environment
American Society of Civil Engineers /Environmental and Water Resources Institute
January 4-6, 2016, Colombo, Sri Lanka
IPWE2016/048
EFFECT OF HYDRAULIC RETENTION TIME ON ROOT OXYGEN
RELEASE AND POLLUTANT REMOVAL IN SUBSURFACE FLOW
CONSTRUCTED WETLANDS
Chamodh Wathugedara1
, Anupa Pathirana1
, Priyantha Bandara2
, Prabha Weerakoon1
1
Department of Civil Engineering, University of Peradeniya, 2
Central Environmental Authority
Abstract:
The amount of oxygen availability at the substrate media of a wetland system is a major factor
involved in efficient removal of several pollutants from wastewater. Oxygen can enter to the
substrate media by direct atmospheric diffusion or by releasing oxygen through root system of
wetland plants which is produced in leaves as a result of photosynthetic activity. However, root
zone oxygen release is predominant in subsurface flow wetland systems.
A laboratory scale experiment was conducted to quantify the root oxygen release by Narrow-leaf
Cattail (Typha Angustifolia), and to investigate the effects of hydraulic retention time (HRT) on
root oxygen release and pollutant removal at different stages of a wetland plant life. The
experimental setup consisted with 24 wetland microcosms of size 20 cm x 30 cm (diameter x
height) and operated as batch flow subsurface flow constructed wetland systems. The wetland
microcosms were prepared using 10 – 20 cm gravel media. Synthetic wastewater was supplied
to 12 microcosms at 7 days HRT and for other 12 microcosms at 3.5 days HRT. Wastewater
samples were collected from the influent and effluents of the microcosms at two weeks interval
and tested for five day biochemical oxygen demand (BOD5), pH, dissolved oxygen (DO),
ammonium (NH4
+
), nitrates (NO3
-
) and total nitrogen (TN). Root oxygen release (ROL), root
morphology and biomass production of wetland plants were estimated at four weeks interval in
two replicates of each 7 days and 3.5 days HRT microcosms. Average ROL values for 7 days
and 3.5 days HRT systems were obtained as 36.9 and 19.5 µmol/gDW/hr respectively. Average
removal efficiencies of BOD5, NH4
+
and TN for 7 days and 3.5 days HRT systems were not
considerably different in the two systems. However, the average NO3
-
removal efficiency in 7
days and 3.5 days HRT systems were 60.5% and 86% respectively. Results show that subsurface
flow constructed wetland systems with 3.5 days HRT are more efficient in NO3-
removal
compared to 7 days HRT.