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Effect of treatment in percolating filters on the numbers of bacteria in sewage in relation to the composition and size of filtering medium

Published online by Cambridge University Press:  15 May 2009

T. G. Tomlinson ,
J. E. Loveless  and
L. G. Sear
T. G. Tomlinson
Affiliation:
Water Pollution Research Laboratory, Stevenage
J. E. Loveless
Affiliation:
Water Pollution Research Laboratory, Stevenage
L. G. Sear
Affiliation:
Water Pollution Research Laboratory, Stevenage
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For a period of a year the total count, Coli-aerogenes count and turbidity were determined on samples of sewage and effluent taken every week from pilot-scale percolating filters treating domestic sewage. The eight filters contained four types of filtering medium in two sizes.

Numbers of coliform bacteria in the settled sewage were much higher during the warmer months but the total count showed no regular seasonal variation. Treatment in all the filters reduced the numbers of bacteria in both groups by over 95%. In general the reductions in numbers of bacteria and in numbers of all particles in suspension were proportional to the total area of filtering medium with which the sewage came into contact. The probability of discharging more than 10,000 coli-aerogenes per ml. ranged from 10% in the most efficient to 90 % in the least efficient filter.

Experiments in which Serratia indica was added to the influent sewage showed that only 0·4 % were recovered in the settled effluent after 24 hr. Treatment in the filters had little selective action on the different types of coliform bacteria.

This paper is published by permission of the Department of Scientific and Industrial Research.

Type
Research Article
Information
Journal of Hygiene , Volume 60 , Issue 3 , September 1962 , pp. 365 - 377
Copyright
Copyright © Cambridge University Press 1962

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