volume 38, issue 18, P3909-3919 2004
DOI: 10.1016/j.watres.2004.06.027
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Britt-Marie Wilén, Kristian Keiding, Per Halkjær Nielsen

Abstract: Activated sludge flocs are known to deflocculate under short-term anaerobic conditions, but little is known about possible reflocculation under subsequent aerobic conditions. When activated sludge flocs from two wastewater treatment plants deflocculated under anaerobic conditions with well-defined shear conditions, they could be almost, but not completely, reflocculated by aeration for 1-2 h under the same shear conditions. If the biological activity was reduced by adding azide, chloramphenicol or by decreasin…

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