Research Papers

Displaying 81 - 90 of 90
The biosand filters used in the filoed study, that had been in use for an average of 2.5 years, showed an overall bacterial removal efficiency of 98.5% and a turbidity reduction from an average of 6.2 NTU in source water to samples to 0.9 NTU in the filtered water. Additioanlly, participants were generally satisfied with them.
Comparative analysis of the filtron and biosand water filters; Duke, W.F.; Nordin, R.; Mazumder, A., 2004
BSFs are less effective than ceramic pot filters in removing bacteria. However, ceramic pot filters have very low flow rates and are susceptible to breakage. Neither technology is perfect.
The long term sustainability of household bio-sand filtration; Fewster, E.; Mol, A.; Wiessent-Brandsma, C., 2004
BSFs performed nearly as well after 4 years of use. Households with poorer filter performance tended to over-clean their filter, indicating that more training was necessary.
Water purification using sand; Wotton, R.S., 2002
A paper explaining how slow sand filtration works by comparing it to riverbank filtration, with a focus on the biological mechanisms.
Slow sand filtration for small water systems; Logsdon, G.S.; Kohne, R.; Abel, S.; LaBonde, S., 2002
Slow sand filters are an appropriate treatment method for small systems in both developed and developing countries.
Transport and fate of Cryptosporidium parvum oocysts in intermittent sand filters.; Logan, A.J.; Stevik, T.K.; Siegrist, R.L.; Rønn, R.M., 2001
In unsaturated sand filters operated intermittently, it was found that media characteristics were the most important factor in determining Cryptosporidium removal, with fine grained media performing better. For the coarse grained media, flow rate and influent quality also played a role.
Photos from an electron scanning microscope of the biolayer of a slow sand filter on day 1 and day 40 of operation.
Toxicant and Parasite Challenge of Manz Intermittent Slow Sand Filter; Palmateer, G.; Manz, D.; Jurkovic, A.; McInnis, R.; Unger, S.; Kwan, K.K.; Dutka, B.J., 1997
The BSF was able to remove 99.98% of Cryptosporidium cysts and > 50% of organic and inorganic toxicants (i.e. herbicides and pesticides). Giardia removal was greater than was able to be detected in this experiment.
Slow sand filtration was implemented in southern Somalia as a means of HWTS in refugee communities. The filters were generally able to treat moderately polluted water to WHO standards, with significant reductions in raw water turbidity and fecal coliforms being observed.
THE reference for slow sand filtration