Results of the First Improvement Step Regarding Removal Efficiency of Kanchan Arsenic Filters in the Lowlands of Nepal—A Case Study

In Nepal as well in other countries Southeast Asia, the World Health Organization drinking water guideline of 10 µg/L concerning arsenic concentrations ground hosted Quaternary alluvial sediments is often regionally exceeded. The commonly accepted theories include that stems from reductive dissolution As-rich Fe(III)hydr(oxides) including microbial degradation sedimentary organic matter. On contrary, influence clay minerals hosts for As was clearly underestimated, geochemical analysis depicted generally associated with specific elements such Na, K, Al, and Li. Moreover, there a very weak correlation or decoupling between Fe Nepal, this fact points to consequences treatment. so-called Kanchan filters, used removal As, installed lowlands exhibited effluent above Nepal’s quality standard value (i.e., 50 ?g/L). Ground proved be most important factors regarding performance filters. flow rate contact time rusty nails filter, intended adsorb on their surface, influenced efficiency. severely by handling too. This short communication provides an overview efficiency 30 drawbacks, aging material filters measures improvements enhance Proper instruction users major point needs addressed future.