AWWA ACE63201

This slide presentation outlines a study on biosand filtration for point-of-use drinking water treatment. Specific goals of the study included: replicate filter preparation and use conditions typicalof a developing country setting;characterize the flow condition in the filter;determine the ability of the BSF to reduceconcentrations ofbacteria,human enteric viruses and bacteriophages, andprotozoan parasites; and,determine changes in filter effectiveness with lengthof filter operation. Laboratory study procedures included:filter preparation methodsdesigned for use indeveloping countries; crushed granite gravelsieved and washed; 20 or 40 liters of surfacewater seeded with challengemicrobes and pouredthrough filter daily;daily filtration for six to eightweeks; and,microbial samples analyzedweekly. Key aspects of laboratory study results include:hydraulic flow condition;filter ripening (or maturation) and flow rate;E. coli reductions and ripening;virus and bacteriophage reductions;effect of filter pause time on microbial reductions;filtrate water after overnight retention in filter bed versus filtratewater from delivered daily dose;effect of cleaning the filter on E. coli reductions; and,Cryptosporidium experiments. Includes figures.

Product Details

Edition:

Vol. - No.

Published:

06/01/2006

Number of Pages:

21

File Size:

1 file , 720 KB