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 typical
of a developing country setting;
characterize the flow condition in the filter;
determine the ability of the BSF to reduce
concentrations of
bacteria,
human enteric viruses and bacteriophages, and
protozoan parasites; and,
determine changes in filter effectiveness with length
of filter operation. Laboratory study procedures included:
filter preparation methods
designed for use in
developing countries;
crushed granite gravel
sieved and washed;
20 or 40 liters of surface
water seeded with challenge
microbes and poured
through filter daily;
daily filtration for six to eight
weeks; and,
microbial samples analyzed
weekly. 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 filtrate
water from delivered daily dose;
effect of cleaning the filter on E. coli reductions; and,
Cryptosporidium experiments. Includes figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 720 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 21 |
| Published : | 06/01/2006 |
