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Research Scholar, Indian Institute of Technology Guwahati


Liquid membrane separation technique for the removal of arsenic from water for drinking purpose

For the past few decades arsenic contamination in drinking water around the globe has led to the research and development of several removal technologies due to its high toxicity. The liquid membrane separation technique being highly selective, simple in design and requires low energy has been employed to remove arsenic from its aqueous solution for the purification of drinking water. This research is intended to identify environmentally benign organic solvent, receiving phase and extractant for the extraction and recovery of arsenic ions from its aqueous solution.


Lessons Learned from Arsenic Mitigation among Private Well Households.

Abstract: Many thousands of research papers have been published on the occurrence, health effects, and mitigation of arsenic in drinking water sourced from groundwater around the world. Here, an attempt is made to summarize this large body of knowledge into a small number of lessons.This is an opinion paper reflecting on why we are far from the goal of eliminating this silent and widespread poison to protect the health of many millions. The lessons are drawn from research in countries representing a range of economic development and cultural contexts. The replacement of household wells with centralized water supplies has reduced population level exposure to moderate (50-100 μg/L) and high (>100 μg/L) levels of arsenic in drinking water in some countries as they become wealthier. However, there remains a very large rural population in all countries where the exposure to low levels (10-50 μg/L) of arsenic continues due to its dispersed occurrence in the environment and frequent reliance on private well. A set of natural (geological and biological), socioeconomic, and behavioral barriers to progress are summarized as lessons. They range from challenges in identifying the exposed households due to spatially heterogeneous arsenic distribution in groundwater, difficulties in quantifying the exposure let alone reducing the exposure, failures in maintaining compliance to arsenic drinking water standards, to misplaced risk perceptions and environmental justice issues. Environmental health professionals have an ethical obligation to help As mitigation among private well water households, along with physicians, hydrogeologists, water treatment specialists, community organizations, and government.

Pub.: 26 Jul '17, Pinned: 30 Aug '17