Field testing of the Kanchan Arsenic Filter (KAF), a biosand filter modified to remove arsenic from contaminated raw water, is generating encouraging results in Cambodia and Bangladesh.
The KAF was found to be highly effective in Phase 1 testing, with average arsenic removals in the 95 to 97 per cent range. All of the 10 test filters consistently reduced levels from an average of 637ppb to less than 50ppb, which is the Cambodian standard for arsenic in drinking water.
Performance of the filters was consistent over the 30-week testing span, which produced 8,400 litres of filtered water.
Phase 2 testing, now underway, involves installing the filters in more challenging locations to determine if their arsenic removal capacity can be exhausted.
The tests will also examine hardness and pH levels, water usage patterns and include a social assessment.
Related news: Arsenic removal: field testing the Kanchan Arsenic Filter in Cambodia, Source Weekly, 22 Mar 2008
See also:
- MIT TechTV video “Arsenic Poisoning and the Kanchan Arsenic Filter” here
- Centre for Affordable Water and Sanitation Technology (CAWST): Adapting the Biosand Filter for Arsenic Removal (10 Apr 2008)
Source: CAWST Newsletter [not yet online, but should become available here], Winter 2008
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