water contaminant Articles
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Remove the Tea Bag Without Removing the Building
When a source of ground water contamination or contaminant vapors is present under a building, efforts to mitigate the spread of contamination may continue indefinitely with mounting costs. Bioremediation may be used to remove the source of vapors or ground water contamination without damage to the building or interrupting operations. There are many examples of this approach in the case studies ...
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Walkerton: requiem for the New Public Management in Ontario?
In May 2000, seven residents of Walkerton, Ontario, died, and hundreds more became seriously ill as a result of the contamination of the town's water supply. Immediately, residents and environmental activists pointed to the weakening of the province's environment ministry as the principal cause. Since coming to power in 1995, the Progressive Conservatives had taken steps to privatise and ...
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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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Biosensors - Using DNA as a biosensor to detect contaminants in water
Biosensor - Using DNA to detect water contamination. ...
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Case Study - Isle of Wight (UK)
The isle of Wight Council look after the Castlehaven Coastal Protection scheme in the Niton area of the island. They were having trouble with the ground water contamination, possibly from the septic tanks, which was causing iron related bacteria to grow in the ground stabilisation dewatering wells. ...
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Water as a weapon in ancient times: considerations of technical and ethical aspects
This paper addresses the issue of how water played a role in ancient conflicts, from the poisoning of water sources to flooding, to stop the advance of enemy armies. It deals with military actions quoted by several ancient Greek and Roman authors, who in some cases narrate these experiences first-hand. Although many abhorred such actions, they were considered tactical expedients to resort to, ...
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Modeling of coastal water contamination in Fortaleza (Northeastern Brazil)
An important tool in environmental management projects and studies due to the complexity of environmental systems, environmental modeling makes it possible to integrate many variables and processes, thereby providing a dynamic view of systems. In this study the bacteriological quality of the coastal waters of Fortaleza (a state capital in Northeastern Brazil) was modeled considering multiple ...
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Source identification of sudden contamination based on the parameter uncertainty analysis
It is important to identify the source information after a sudden water contamination incident occurs in a water supply system. The accuracy of the simulation model's parameters determines the accuracy of the source information. However, it is difficult to obtain the true value of these parameters by existing methods, so reduction of the errors caused by the uncertainty of these parameters is ...
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A coupled stochastic/deterministic model to estimate the evolution of the risk of water contamination by pesticides across Canada
Periodic assessments of the risk of water contamination by pesticides help decision makers to improve the sustainability of agricultural management practices. In Canada, when evaluating the risk of water contamination by pesticides, there are two main constraints. First, because the area of interest is large, a pesticide transport model with low computational running time is mandatory. Second, ...
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Vulnerability of complex critical systems: case water supply and distribution networks
Management of complex, interdependent critical infrastructures demands systematic continuity evaluations and capability building for abnormal as well as normal conditions. The changing risk and threat environment creates new vulnerabilities that require an extensive approach to control weak points and support the undisturbed and reliable functions of critical infrastructures. The water ...
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Water contamination in fuel: cause and effect
Water exists in three physical states and depending on the surrounding conditions it finds its way to the fuel systems like the high pressure common rail (HPCR) fuel systems on diesel engines. The important point thereafter is to provide the best possible on-engine protection by securing the fuel injector systems from severe damage. As the environmental challenges and emission regulations become ...
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Storm water contaminant loading following southern California wildfires
Contaminant loading associated with stormwater runoff from recently burned areas is poorly understood, despite the fact that it has the potential to affect downstream water quality. The goal of the present study is to assess regional patterns of runoff and contaminant loading from wildfires in urban fringe areas of southern California. Postfire stormwater runoff was sampled from five wildfires ...
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CL#7 - In Situ BioLogix Application - Case Study
Site Information Dry cleaning solvents were found in the ground water at the former location of a dry cleaning facility at a commercial shopping center. Most of the mass of ground water contamination was located under a bank that was built over the former dry cleaners, restricting access for remediation. The PCE plume was estimated to be 30,000 square feet. The PCE concentration was greater than ...
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Incorporating potable water sources and use habits into surveys that improve surrogate exposure estimates for water contaminants: the case of bisphenol A
Human biomonitoring studies for water contaminants are often accompanied by surveys relying solely on total drinking water consumption rates, thus, failing to account for specific water sources (bottled and tap water) and use habits, such as water used for preparing cold/hot beverages (coffee, tea, juice, etc.). Despite the extensive use of bisphenol A (BPA) in polycarbonate (PC)-based water ...
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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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Potential Drinking Water Contamination Analyzed
A comparison of more than 100 large US cities showed pollution from point and nonpoint sources Too often, surveys of water quality in the United States have been regionally inconsistent patchworks that neglect many unregulated contaminants. A granular study of potential source water contamination in the largest cities in the U.S. has been lacking. New research in the journal Nature, however, ...
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Possible ways to improve sediment deposition in the Nemunas delta
The deposition of sediment in the inundated floodplains of rivers, particularly in their deltas, improves the water quality of the rivers themselves and of their receivers. It would be very useful if ways to increase the amount of sediment deposition could be identified. An investigation into a number of possibilities was carried out in the delta of the River Nemunas. Various factors can ...
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AquaGate+Organoclay Installation Profile
This article provides an overview of an installation of AquaGate+Organoclay material to reduce sheens at a historic MGP site. AquaGate+Organoclay provides the abiltiy to place a powder organoclay through the water, in direct contact with contaminants in sediment. Organoclay is a well known and documented material used in the oil & gas industry for adsorption of hydrocarbon-based ...
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CL#9 - In Situ BioLogix Application - Case Study
Site Information Soil and ground water contamination by chlorinated solvents was discovered at a former industrial chemical mixing facility that was to be redeveloped as a shopping center. The contamination had leached from the soil underlying a drum storage area into ground water and spread across the property. While the area of contamination was relatively small (5,000 square feet) and ...
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Effect of pH on selective decomposition of target water contaminants onto porous TiO2 photocatalyst
Non-selectivity of TiO2-based photocatalysis is a known drawback of this technology for full scale water treatment applications. It results in significant decline in decomposition of toxic target contaminants when other non-toxic organic compounds such as natural organic matter (NOM) compete in the reaction. Previously, size exclusion of large NOM onto the mesoporous structure of TiO2 ...
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