Arsenic removal from drinking water
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This document presents information about arsenic removal from drinking water. It discusses the sources and chemistry of arsenic in water and the toxicity of arsenic to humans, affecting multiple body systems. It then outlines several technologies for arsenic removal, including precipitation, adsorption, ion exchange, and membrane filtration processes. Emerging technologies discussed include oxidation using iron and manganese, sorption onto metal oxides and reduced metals, and in situ immobilization. Both centralized systems and household-level point-of-use treatment systems are presented as options for arsenic removal from drinking water.
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Titansorb is a granular filter media made of nanosized titanium oxyhydrate that strongly adsorbs arsenic and other contaminants through active Ti-OH groups on its surface, making it effective for arsenic removal from drinking water with a wide pH tolerance and high adsorption capacity. It performs better than alternative media like alumina and iron hydroxide in adsorbing arsenic with less risk of leaching even with pH fluctuations. Titansorb provides an effective and lower-cost solution for arsenic treatment in small to medium water systems.
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Sulfur oxides are main precursors of atmospheric acidification, aerosol generation, and acidic dry and wet deposition.
There are many methods available for controlling the emission of SO2. Such as:
extraction of sulfur from fuel oils.
Sulfur reduction within combustion chamber.
Treating of flue gases.
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Mainly in industries dry, elevated temperature removal processes are used as cold plume is not formed and problem of handling large amount of slurry in flue gases is avoided.
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effluents from polluted wastewater. Maize cob readily available was used as sorbent for the removal of lead ions
from aqueous media. Adsorption studies were performed by batch experiments as a function of process
parameters such as sorption 500ppm,2.5g, 400minutes, 400 rpm and 5 PH. Concentration, Dosage, time, rpm,
and pH. I have found that the optimized parameters are Freundlich model fits best with the experimental
equilibrium data among the three tested adsorption isotherm models. The kinetic data correlated well with the
Lagergren first order kinetic model for the adsorption studies of lead using maize cob. It was concluded that
adsorbent prepared from maize cob as to be a favorable adsorbent and easily available to remove the heavy
metal lead (II) is 95 % and can be used for the treatment of heavy metals in wastewater.
Arsenic contamination and arsenicosis in jessore, bangladesh (1990 2010)
This document summarizes a presentation on arsenic contamination and related health issues in Jessore, Bangladesh from 1990-2010. It discusses that groundwater in Jessore contains 10 times higher arsenic concentrations than WHO recommendations. The main causes of contamination are low-lying water tables and microbial changes to sediments. Long-term exposure causes arsenicosis, with symptoms ranging from skin lesions to cancer. Mitigation techniques discussed include oxidation, co-precipitation, lime filtration, and ion exchange to remove arsenic from drinking water. NGOs are also working in Jessore to address the arsenic problem.
arsenic contamination of groundwater
This document is a seminar report on arsenic contamination of groundwater submitted by Mayank Saxena to the Department of Civil Engineering at IIT Banaras Hindu University under the guidance of Prof. Devendra Mohan. The report reviews the nature and health impacts of arsenic contamination globally, with a focus on Asia. It discusses the physical and chemical properties of arsenic, how it naturally contaminates groundwater, and its distribution across various continents and regions including Asia, Europe, Australia, North America, and South America. Areas heavily affected in Asia include Bangladesh, West Bengal in India, parts of China, Pakistan, and others.
NANOTECHNOLOGY IN BIOREMEDIATION
The use of nanoparticles and nanotechnology to enhance the microbial activity to remove pollutants, they also enhance bioremediation.
NanoBioremediation has the potential not only to reduce the overall costs of cleaning up large-scale contaminated sites, but it can also reduce clean up time.
Controlled release formulations as a smart delivery system for eco friendly p...
Controlled release formulations as a smart delivery system for eco friendly p...Asst Prof SSNAIK ENTO PJTSAU
Here I would like to explain you on bio pesticides and their disadvantages and their alternative way of utilization like controlled release formulations and also role of nanotechnology in the bio pesticides longevity in the environment. I hope it would increase your understanding on the concepts .......................................................Isolation, Screening and Characterisation of Polyhydroxyalkanoate Producing B...
Isolation, Screening and Characterisation of Polyhydroxyalkanoate Producing B...SSR Institute of International Journal of Life Sciences
ABSTRACT- The development of human civilization throughout history has led to growing disruption of the natural
balance and the occurrence of different types of pollution. Environmental pollution with petroleum and petrochemical
products has been recognized as significant and serious problem. Diesel engine oil, which is one of the major products of
crude oil, constitutes a major source of pollution in our environment. Therefore diesel engine oil can enter into the
environment through wrecks of oil tankers carrying diesel oil, cleaning of diesel tanks by merchants, war ships carrying
diesel oil and motor mechanics. In present study the microorganisms utilising petrol and diesel oil as carbon source were
isolated and investigation of their characteristics towards the production of polyhydroxyalkanoates (PHA), which is now a
days well known as biodegradable polymer.
Key Words- Petrol and Diesel oil contamination, Bioremediation, Biodegradable bacterial polymer, Sudan
Black B staining, 16sr RNA sequencingZ24172184
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Final Report
This document describes a graduate project report on using cashew nut shells as an agricultural waste adsorbent for the removal of phenol from wastewater. The aim is to investigate the capability of cashew nut shells to remove phenol and study the effects of parameters like initial phenol concentration, adsorbent dosage, contact time and temperature on adsorption. The project involves preparing and characterizing the adsorbent, optimizing operating conditions, and conducting kinetic and equilibrium studies to analyze adsorption data using isotherm models. The results show that cashew nut shells activated with sulfuric acid can effectively remove 57.18% of phenol from wastewater, close to the predicted removal of 61.006
Trace metals concentration determination in domestic water
This document analyzes trace metal concentrations in domestic water samples from Keana mine area in Nasarawa State, Nigeria. Water samples were collected from wells, boreholes, and streams in the area and analyzed for concentrations of arsenic, cadmium, chromium, strontium, lead, thorium, and zinc using inductively coupled plasma optical emission spectrometry. The results found high levels of arsenic exceeding WHO guidelines in all samples. Strontium levels were close to the acceptable range. Lead and zinc concentrations were low. The high arsenic levels pose a health risk and suggest closer monitoring of water sources is needed to reduce risks to local inhabitants.
Dr.C.Kavitha (1).pdf
This document summarizes a study that investigated the use of Parthenium stem powder for biosorption of lead from aqueous solutions. The study optimized various process parameters like pH, contact time, temperature, adsorbent dosage and initial lead concentration using response surface methodology. Batch experiments using Box-Behnken design showed that the optimum conditions for maximum lead biosorption were a pH of 5, initial lead concentration of 20 mg/L, and adsorbent dosage of 30 g/L. Kinetic, thermodynamic and isotherm studies demonstrated that the adsorption process was spontaneous and fit the pseudo-second order kinetic model and Langmuir isotherm model. The Parthenium stem powder was found to
Dr.C.Kavitha.pdf
This document summarizes a study that investigated the use of Parthenium stem powder for biosorption of lead from aqueous solutions. The study optimized various process parameters like pH, contact time, temperature, adsorbent dosage and initial lead concentration using response surface methodology. Batch experiments using Box-Behnken design showed that the optimum conditions for maximum lead biosorption were a pH of 5, initial lead concentration of 20 mg/L, and adsorbent dosage of 30 g/L. Kinetic, thermodynamic, and isotherm studies demonstrated that the adsorption process was spontaneous and fit the pseudo-second order kinetic model and Langmuir isotherm model. The Parthenium stem powder was found
Dr.P.Vijayasarathi.pdf
This document describes a study investigating the use of Parthenium stem powder for removing lead from aqueous solutions. Response surface methodology was used to optimize the conditions for lead biosorption based on variables like pH, initial lead concentration, and adsorbent dosage. Experiments were conducted using a Box-Behnken design. The results showed that Parthenium stem powder can reduce lead concentration by up to 72.74% at pH 5, 20 mg/L initial concentration, and 30 g/L adsorbent dosage. Kinetic, thermodynamic, and isotherm studies provided insights into the adsorption process.
A THESIS ON NANOPIGMENT
It is a thesis entitled "BIOLOGICALLY DERIVED NANO-PIGMENT FOR ANTIBACTERIAL ACTIVITY,
SURFACE COATING AND IN-VITRO CYTOTOXICITY TESTS ON FIBROBLASTS"
Nanotechnology in waste water treatment
This document discusses the use of nanotechnology for wastewater treatment. It notes that over 75% of the Earth is covered in water, but less than 1% is accessible freshwater for human use. Nanomaterials like dendrimers, metal nanoparticles, zeolites and carbon nanotubes can be used for wastewater treatment through processes like nanosorption, nanofiltration and photocatalysis. These nanomaterials have advantages over conventional treatment methods like higher efficiency and capacity. However, scaling up nanotechnology for wastewater treatment remains a challenge.
F0411925
IOSR Journal of Applied Chemistry (IOSR-JAC) is an open access international journal that provides rapid publication (within a month) of articles in all areas of applied chemistry and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in Chemical Science. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Pesticide mineralization in water using silver nanoparticles incorporated on ...
Pesticide mineralization in water using silver nanoparticles incorporated on ...International Journal of Science and Research (IJSR)
This document describes a study on using silver nanoparticles incorporated onto polyurethane foam to mineralize pesticides in water. Silver nanoparticles were synthesized using trisodium citrate and characterized before being incorporated onto polyurethane foam. The foam was then used to mineralize chlorpyrifos and malathion in water solutions at different concentrations over time. Mineralization time was found to increase with higher initial pesticide concentration, with chlorpyrifos being fully mineralized faster than malathion at the same concentrations. The study evaluated silver nanoparticles on polyurethane foam as a potential method for removing pesticides from contaminated water.Ad044203208
This document provides a literature review on the use of nanoparticles for removing contaminants from wastewater. It discusses nanoparticles that have been used to remove various types of contaminants including metals, non-metals, organic and inorganic pollutants, and microorganisms. The document surveys research on nanoparticles for removing specific contaminants such as heavy metals, pesticides, mercury, and pathogenic bacteria. It also examines factors that influence contaminant removal like nanoparticle size, surface chemistry, adsorption properties, and reusability. The literature demonstrates that nanoparticles show potential for wastewater treatment due to their large surface area and chemical reactivity.
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Removal of dye from polluted water using novel nano manganese oxide-based mat...
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ANALYSIS OF HYDROGEOCHEMICAL AND MINERALOGICAL CHARACTERISTICS RELATED TO HEA...
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Management of Arsenic Contamination in Groundwater
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Removal of Lead Ion Using Maize Cob as a Bioadsorbent
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Arsenic contamination and arsenicosis in jessore, bangladesh (1990 2010)
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Trace metals concentration determination in domestic water
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Topic5 organizational factors
Organizational leadership and culture play an important role in workplace health and safety. Behavioral safety programs focus on observing and influencing employee behaviors to reduce unsafe actions. Case studies show how leadership commitment to health and safety, clear policies, workforce participation, and data-driven processes can result in improved safety culture and reduced accidents and costs for an organization.
Topic 04 risk mangement
The document provides an overview of risk management principles and processes for human error. It discusses qualitative and quantitative risk assessment approaches. The key stages of risk management are identified as hazard identification, risk assessment, and risk control. Methods for hazard identification, risk estimation, and developing risk control plans are outlined. Finally, the TRIPOD framework for accident investigation and analysis is introduced, which uses a causal model to identify hazards, events, targets, barriers, failures, preconditions, and latent failures.
Topic 3 swiss cheese model
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Topic 02 human and organizational factors in process industry
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The document summarizes several major industrial accidents and disasters:
1) The 1974 Flixborough disaster in England where a chemical plant explosion killed 28 people after a temporary pipe ruptured and ignited 40 tons of cyclohexane.
2) The 1979 Three Mile Island nuclear accident in Pennsylvania where a partial nuclear meltdown occurred due to failures in the cooling system.
3) The 1986 Space Shuttle Challenger disaster where the shuttle broke apart 73 seconds into launch due to an O-ring failure, killing all 7 crew members.
4) The 1986 Chernobyl nuclear accident in Ukraine where a reactor explosion released radiation due to operator errors during a safety test, contaminating a large area.
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Control methods
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