AWWA ACE93139

Slow sand filter Escherichia coli removal mechanisms were investigated at bench scale. Eighty five percent of influent E. coli were removed in the top 2 cm of filters. Experiments conducted using sodium azide (an inhibitor of oxidative phosphorylation) revealed all E. coli removal to be due to biological mechanisms. Bacterivory and attachment to biofilms are mechanisms responsible for bacteria removal. The filter cake, defined as that portion of the schmutzdecke above the filter surface, did not remove bacteria. While the filter cake commonly is regarded as being responsible for the effectiveness of slow sand filters, it contributed only head loss in this study.

Product Details

Published:

01/01/1993

ISBN(s):

0898677130

Number of Pages:

25

File Size:

1 file , 1.2 MB