water contaminant Articles
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Water Contaminants and Their Treatment
Because many water contaminants are invisible and odorless, samples should be tested to determine a treatment plan. Many steps may be necessary to make water potable Many traditional sources of fresh water, both surface water and groundwater, may carry visible and invisible contaminants that make it unsuitable for consumption. The World Health Organization (WHO) has established Guidelines for ...
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Pakistan Facing Deadly Water Contamination
Drought, overdraft of aquifers, and water contamination all contribute to an ever-increasing water crisis in Pakistan. 40% of deaths in country are attributed to critical pollution problem An estimated 40% of all deaths in Pakistan are caused by ingesting contaminated water — water filled with industrial waste, arsenic, diseases, and sewage. As recently as the late 1990s, ...
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An assessment on
Spirulina platensis as a biosorbent for arsenic removalA column consisting of algal biosorbents like agar-agar, alginic acid, calcium alginate and Spirulina platensis biomass entrapped in polyurethane foam matrix was designed and tested for the removal of As(V) from the aqueous medium. The performance of the column was studied in terms of removal efficiency, metal sequestered in the column during a specified time and biosorption capacity. The ...
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Study: Drinking Water Contaminants Cause 100,000 Cancers
Researchers suggest ways to reduce risks in water sources A new Environmental Working Group (EWG) study of contaminants in drinking water, conducted between 2010 and 2017 in the United States, suggests they may cause 100,000 lifetime cancer cases. The research team of Sydney Evans, Chris Campbell, and Olga V. Naidenko attributed the cumulative risk primarily to arsenic, disinfection byproducts, ...
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Arsenic removal from arsenic-contaminated water by biological arsenite oxidation and chemical ferrous iron oxidation using a down-flow hanging sponge reactor
The down-flow hanging sponge (DHS) reactor was used for continuous As removal treatment of As-contaminated water. The treatment scheme was: (1) As(III) in contaminated water is oxidized by arsenite-oxidizing bacteria fixed in the sponges in the reactor; (2) Fe(II) naturally existing in the water is oxidized by dissolved oxygen; (3) Fe(III) is precipitated as iron hydroxide and As(V) is ...
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Plant algae method for arsenic removal from arsenic contaminated groundwater
Field studies were carried out in Urumqi River Basin in Northwest China. The study focused on experimentation on a plant algae method that was tested by taking various water chemistries into consideration. The results from a greenhouse experiment evaluated for four doses of P (0, 100, 200, and 300 μmol/L) using two ferns (30 and 60 day old) on 15 L of contaminated groundwater per plant revealed ...
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How Arsenic Biological Filtration Systems Can Improve Your Life
Water is the foundation of human existence. It’s used for cooking, bathing, cleaning, and most importantly, drinking. Unfortunately, water is often dirty and contaminated, especially when it’s pulled from groundwater sources and wells. Since many cities have been shown to have low-grade drinking water, concern has increased about water quality. Many people are wondering if their water ...
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Phytofiltration of water polluted with arsenic and heavy metals
This article reviews recent advances in phytofiltration of arsenic and toxic heavy metals from contaminated water ecosystems. Arsenic and metal contamination in drinking and non-drinking water has created global environmental health concerns. Phytofiltration using aquatic and terrestrial plants has promising potential for the ex situ and in situ clean-up of these waters. An arsenic ...
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Treatment and remediation methods for arsenic removal from the ground water
Globally, ground water is contaminating by arsenic continously, which needs economic treatment and remediation technologies. Physical, chemical and biological treatment methods have been developed, that include different kinds of filters, bucket type units, fill and draw, kalshi etc. The remediation methods discussed are air oxidation, reactive barriers, utilisation of deeper aquifers and ...
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Arsenic contamination in water: a conceptual framework of policy options with particular reference to Bengal delta basin
Arsenic contamination in water supplies continues to increase in many countries, especially in developing nations, thereby creating both environmental and health hazard. Its sources and effects are multiple and diffused in nature and it requires detailed assessment and policy. This paper discusses the global extent of the problem, its sources and effects and explores different policy options. ...
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Slow arsenic poisoning of the contaminated groundwater users
This paper gives impact of Arsenic contaminated water on human health as well as overview of the extent and severity of groundwater arsenic contamination in Bangladesh. Scalp hair is the most important part of the human body to monitor the accumulation of this type of poison. Therefore, an experiment has been carried out by Neutron Activation Analysis (NAA) at Atomic Energy Research Establishment ...
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Guide to Removing Arsenic from Drinking Water
It’s said that the human body is made up of almost 60 percent water. Is the water you’re putting into your body pure? Many people are unaware of the chemicals and compounds that are seeping into their drinking water and wreaking havoc on their internal systems. Arsenic, for example, can be found in many different areas. In the Northeast especially, well water is more likely to be ...
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Effective Techniques for Arsenic Removal from Water
Arsenic is a tricky substance because it is colorless and odorless, making detecting its presence and ensuring its removal at a contaminant site tricky. However, high levels of arsenic can have drastic, fatal effects on wildlife as well as humans if left untreated. If it isn’t properly and fully extracted, serious problems can result. If you’re considering the best industrial level ...
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Arsenic contamination and its causative factors in parts of Chhattisgarh, Central East India
This paper reports the present status of ground water arsenic contamination in the parts of Ambagarh Chowki block in District Rajnandgaon, of Chhattisgarh State. This location is the first arsenic contaminated location reported outside Bengal Delta Plain. The analysis of arsenic contamination measured during year 2008 to 2009 is compared with previously reported synoptic sampling results. This ...
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What is Reverse Osmosis?
Reverse osmosis is used quite a bit nowadays to help supply people with water. Without the help of a process such as reverse osmosis purification, there would be a shortage of water for a lot of people in many different towns and cities as a lot of people are dependent on getting their water access directly from reverse osmosis filter systems, even if they do not know that is where their water ...
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Development of a portable filter for arsenic removal from drinking water
In the present study, different grades of indigenously available activated alumina (AA) were screened for their arsenic removal capacity. For both As(III) and As(V), A1 (Grade 1, 0.3-0.6 mm) activated alumina has shown better removal efficiency. The optimum pH for the adsorption phenomena was around 7.0. Chlorine at a dose of 20 mg/l could completely oxidize As(III) to As(V), which also assured ...
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Design of dual water supply system using rainwater and groundwater at arsenic contaminated area in Vietnam
Fresh water, a renewable but limited resource, is scarce in many areas of the developing world. This paper proposes a dual water supply consisting of both rainwater and groundwater to provide sustainable water for an arsenic contaminated area. In this paper, a novel model has been developed based on rainfall variance. A rainwater harvesting (RWH) system can obtain optimal performance by ...
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Treatment and remediation methods for arsenic removal from the ground water
Globally, ground water is contaminating by arsenic continously, which needs economic treatment and remediation technologies. Physical, chemical and biological treatment methods have been developed, that include different kinds of filters, bucket type units, fill and draw, kalshi etc. The remediation methods discussed are air oxidation, reactive barriers, utilisation of deeper aquifers and ...
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Application of lactic acid bacteria in removing heavy metals and aflatoxin B1 from contaminated water
In this study selected lactic acid bacteria (LAB, Lactobacillus acidophilus, Lactobacillus rhamnosus, Lactobacillus plantrium and Streptococcus thermophiles) and probiotic bacteria (Bifidobacterium angulatum) were tested for their ability in removing heavy metals (HM) including cadmium (Cd), lead (Pb) and arsenic (As) as well as aflatoxin B1 (AFB1) from contaminated water. The biosorption ...
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Well water win-win
Solve two problems with one filter? That’s what Drinkwell aims to do. Begun through a collaboration between researchers at Lehigh University and the Bengal Engineering and Science University, the Boston-based social venture — recently named winner of the 2014 SXSW Eco Social Impact for Profit competition — offers an innovative approach to removing arsenic, an odorless, colorless ...
By Ensia
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