Research Papers

Displaying 31 - 40 of 89
Households with higher education levels, higher socio-economic status indicator scores, and additional treatment steps were LESS likely to be properly maintaining and operating their BSF, while households with soap were more likely to be doing it properly. Proper filter operation and maintenance of BSF, improved water source, and higher education levels were associated with reduced diarrhoea in households.
Evaluation of the Impact of the Plastic BioSand Filter on Health and Drinking Water Quality in Rural Tamale, Ghana; Stauber, C.E.; Kominek, B.; Liang, K.R.; Osman, M.K.; Sobsey, M.D., 2012
Plastic biosand filters led to a diarrhoea reduction of 60%. Water from the filters had a 97% removal of E. coli.
A randomized controlled trial of the plastic-housing BioSand filter and its impact on diarrheal disease in Copan, Honduras.; Fabiszewski de Aceituno, A.M.; Stauber, C.E.; Walters, A.R.; Meza Sanchez, R.E.; Sobsey, M.D., 2012
Households with plastic BSFs in Honduras had 39% less diarrhoea than households without, but the difference was not statistically significant.
Hydraulic Loading Rate Effect on Removal Rates in a BioSand Filter: A Pilot Study of Three Conditions; Kennedy, T.J.; Hernandez, E.A.; Morse, A.N.; Anderson, T.A., 2012
(Caution: This study did not have replicates) Reducing the initial flow rate in Hydraid filters, by modifying the outlet pipe, did not significantly improve E.coli reduction.
Metallic iron can be effective in water treatment, but then needs to be removed. The authors propose solving this problem by incorporating it into granular media filters like BSF, and provide some theoretical design guidelines.
Households which were using BSF had 61% less diarrhoea. After one year, 90% of BSF's were still in use, and were removing 88.4% of E. coli.
Iron oxide amended biosand filters for virus removal; Bradley, I.; Straub, A.; Maraccini, P.; Markazi, S.; Nguyen, T.H., 2011
BSFs that were modified to have a layer of media where iron was mixed with the sand performed better than regular BSF at removing viruses. However, over a long time period (>200 days) even the regular filter reached 4 log 10 removal (99.99%).
Cluster Randomized Controlled Trial of the Plastic BioSand Water Filter in Cambodia; Stauber, C.E.; Printy, E.R.; McCarty, F.A.; Liang, K.R.; Sobsey, M.D., 2011
Households with a Hydraid BSF reported 59% less diarrhoea than households without. The BSF removed 93% of E. coli. 75-90% of households willingly paid $10 for their filter.
A quick overview of HWTS methods.
BSF's work best at removing bacteria and viruses when they have lower loading heads, lower maximum flow rates, finer sand, and longer pause periods.