arsenic Articles
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Bacterial biofilms formed in arsenic-containing water: bacterial community characterization
We have analyzed the structure and diversity of bacterial biofilms formed on different water distribution materials in the absence and in the presence of 5 mg/L of arsenic(V). Three commercial metals (cast iron, zinc and copper) and polypropylene were used as substrata for biofilm formation. Biofilms were observed using scanning electron microscopy. Microbial ecology techniques (DNA ...
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A performance assessment of arsenic-iron removal plants in the Manikganj District of Bangladesh
In Bangladesh, arsenic contamination of groundwater, microbial contamination of surface water and seasonally variable rainfall make reliable access to acceptable quality drinking water a challenge. Arsenic-iron removal plants (AIRPs) are a relatively inexpensive way of removing arsenic from groundwater for access to safer drinking water. This study evaluated the performance of 21 (of 105) AIRPs ...
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Microbial contamination and associated health burden of rainwater harvesting in Bangladesh
Rooftop rainwater harvesting has received an increased attention as a potential alternative water supply source both in the coastal and arsenic affected rural areas in Bangladesh. Several programs in installing rainwater harvesting systems have been implemented to mitigate the drinking water problem in the coastal and arsenic affected areas in the country. This study was conducted with a view to ...
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Technological approaches to providing safe drinking water for rural and remote areas
Provision of safe drinking water is one of the key drivers in our technological pursuits. A number of habitations are suffering from a variety of water quality problems such as excess salinity, iron, arsenic, fluoride, nitrate and microbial contamination. Simplicity of operation, less dependence on external sources of power supply, minimisation of wastewater, etc., are some of the ground rules to ...
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Beware of Bottled Water!
Many brands of bottled water are nothing more than filtered municipal tap water. Tests conducted by the Natural Resources Defense Council found about 25% of the bottles tested contained bacteria, arsenic and chemicals that exceeded FDA levels. Environmental-wise, about 38 billion bottles are filling up in our landfills each year. Does Water Type Matter? Absolutely! Water contains toxins, but ...
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Quality and suitability of harvested rainwater for drinking in Bangladesh
Several programs have been undertaken during the last few years to install rooftop rainwater harvesting systems as an alternative drinking water supply source both in the coastal and arsenic affected areas in Bangladesh. In this study, quality of the harvested rainwater used for drinking water supply was assessed. A total of 308 harvested rainwater samples were collected from the different ...
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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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gaiasafe filter products for drinking water purification - Case Study
Problem In some water works chlorination of drinking water is used to eliminate mikrobes. Chlorinated water may have disagreable taste and smell. Some water works use aluminium salts to clean the water. This leads to low concentrations of aluminium in drinking water. Today it is known that aluminium may be toxic to men. Old piping installations inside or outside private homes often where made of ...
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Bacterial biofilms formed in arsenic-containing water: biodeterioration of water network materials
The immersion of any material in a water system triggers a surface microbial colonization which simultaneously influences the corrosion behavior of the substratum. The present study was focused on the As(V) influence on the biofilm formation and their consequences on the corrosion behavior of different substrata. Commercial materials used in water distribution networks: alloys based on Fe, Zn ...
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Challenges and approach to integrated water resource management
Water is the natural resource on which human life, food security and the health of ecosystems depend. The requirement for water is increasing rapidly owing to progressive increase in the demand for irrigation, rapid industrialisation, population growth and improving living standards. The existing water resources are diminishing due to (a) unequal distribution of rain leading to drought, (b) ...
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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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The Invisible Water Pollution Crisis
Around the world, water contaminants are damaging human health and local economies The World Bank, in its new report “Quality Unknown: The Invisible Water Crisis,” asserts that water contamination is already a problem. But it is one that will only worsen in the future with global warming. The report foregrounds the fact that not all dangerously contaminated bodies of water will ...
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The History of Water Distribution and Treatment
Introduction Ancient water distribution and treatment methods originated millennia before principles of modern hydraulic design, such as conservation of mass, energy, and momentum, were even put to thought [1]. Spending most of human history as hunters and gatherers, only in the last 10,000 years did civilizations develop more sophisticated means of agriculture-use and, in turn, water ...
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