Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1021/es900527j
Titel (primär) Slow sand filtration of secondary clarifier effluent for wastewater reuse
Autor Langenbach, K.; Kuschk, P.; Horn, H.; Kästner, M.
Quelle Environmental Science & Technology
Erscheinungsjahr 2009
Department UBT
Band/Volume 43
Heft 15
Seite von 5896
Seite bis 5901
Sprache englisch
Abstract Appropriate technologies are needed for disinfection of wastewater to allow safe reuse. Slow sand filtration is a simple technology used for pathogen and particle removal in drinking water purification. We investigated removal of fecal indicator bacteria relevant for wastewater reuse, particle removal, and runtime in slow sand filtration of secondary clarifier effluent. The key process parameters hydraulic loading rate, sand grain size distribution, and filter bed depth were systematically varied. Slow sand filters for tertiary treatment of wastewater seem promising for wastewater reuse, especially in and developing countries. They eliminated 1.9-2.6 log(10)- units of E. coli and 1.9-3.0 log(10)-units of intestinal Enterococci reaching effluent concentrations of 11-142 CFU per 100 mL of E. coli and 2-24 CFU per 100 mL of intestinal Enterococci. Bacteria removal was shown to be a function of sand surface area, dirt layer, and supernatant water. Sand surface area per filter surface area should not be chosen below 2000m(2)/m(2). Slow sand filters removed 70-84% of total suspended solids reaching effluent concentrations of 1.2-2.3 mg/L and turbidity levels of 0.5-0.8 NTU. Average runtime was between 59 and 148 days
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Langenbach, K., Kuschk, P., Horn, H., Kästner, M. (2009):
Slow sand filtration of secondary clarifier effluent for wastewater reuse
Environ. Sci. Technol. 43 (15), 5896 - 5901 10.1021/es900527j