砷
环境科学
地下水
地下水砷污染
废物管理
浸出(土壤学)
环境工程
工程类
化学
土壤科学
土壤水分
有机化学
岩土工程
作者
Sudipta Sarkar,Lee Blaney,Anirban Das Gupta,Debabrata Ghosh,Arup K. SenGupta
摘要
Of all the naturally occurring groundwater contaminants, arsenic is by far the most toxic. Any large-scale treatment strategy to remove arsenic from groundwater must take into consideration safe containment of the arsenic removed with no adverse ecological impact. Currently, 175 well-head community-based arsenic removal units are in operation in remote villages of the Indian subcontinent. Approximately 150,000 villagers collect arsenic-safe potable water everyday from these units. The continued safe operation of these units has amply demonstrated that use of regenerable arsenic-selective adsorbents is quite viable in remote locations. Upon exhaustion, the adsorbents are regenerated in a central facility by a few trained villagers and reused. The process of regeneration reduces the volume of disposable arsenic-laden solids by nearly 2 orders of magnitude. Finally, the arsenic-laden solids are contained on well-aerated coarse-sand filters with minimum arsenic leaching. This disposal technique is scientifically more appropriate than dumping arsenic-loaded adsorbents in the reducing environment of landfills as currently practiced in developed countries including the United States.
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