Contact Zone: French Practice with Low F/M Bulking Control

A study of twelve wastewater treatment plants in France confirms the effectiveness of the contact zone technique in controlling sludge bulking (with a reduction in the Sludge Volume Index in 91% of cases) and foaming (improvement of the situation in 75% of the cases). The study focused on low-F/M ac...

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Bibliographic Details
Published inWater Science & Technology Vol. 29; no. 7; pp. 221 - 228
Main Authors Pujol, R, Canler, J P
Format Journal Article Conference Proceeding
LanguageEnglish
Published London IWA Publishing 01.01.1994
Subjects
Activated sludge
Aeration
Bulking sludge
Environmental Sciences
Foaming
Sludge
Sludge volume index
Wastewater
Wastewater treatment
Wastewater treatment plants
France
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Summary:A study of twelve wastewater treatment plants in France confirms the effectiveness of the contact zone technique in controlling sludge bulking (with a reduction in the Sludge Volume Index in 91% of cases) and foaming (improvement of the situation in 75% of the cases). The study focused on low-F/M activated sludge units in which organisms such as Microthrix p. or type 0041 (characteristic of these plants) were identified. Contact zones do not entail any major limitations, a fact which advocates their use in this type of treatment facility. Rational operation of the plant (in terms of aeration and sludge production) and compliance with a few simple rules will ensure effective use of this technology.
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ISSN:0273-1223
1996-9732
DOI:10.2166/wst.1994.0345