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Characteristics of Sludge Bulking Caused by Low Dissolved Oxygen in Aeration Tank for Paper Mill Wastewater Treatment  

Kwak, Dong-Heui (Division of Environmental and Chemical Engineering, Seonam University)
Yoo, Seung-Joon (Division of Environmental and Chemical Engineering, Seonam University)
Park, Jong-Chun (Department of Micro-biology, Seonam University)
Publication Information
Journal of Korean Society on Water Environment / v.24, no.4, 2008 , pp. 458-464 More about this Journal
Abstract
Bulking phenomena and scum formation are common problem in suspended growth system like the activated sludge plants for wastewater treatment. Apart from wastewater composition, operating conditions, such as mechanical stress by insufficient oxygen supply, are often decisive for the occurrence of a bulking or scumming problem. There were the comparative aeration tanks in terms of sludge bulking caused by the difference of mechanical aeration facilities in the wastewater treatment plant of N paper mill company. In this study the cause of bulking was investigated through not only the biological isolation and identification but also a series of operational data consideration. On the basis of the investigation results for bulking cause, the operational criteria on dissolved oxygen concentration was derived to decrease the bulking problem.
Keywords
Activated sludge; Aeration tank; Bulking; Dissolved oxygen; Paper mill;
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