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New Sludge Settling Characteristic Index Considering Sludge Settling Velocity  

Park, Suk Gyun (광운대학교 환경공학과)
Kang, Seon-Hong (광운대학교 환경공학과)
Kim, Dong-Ha (국민대학교 건설시스템공학부)
Publication Information
Journal of Korean Society of Water and Wastewater / v.20, no.3, 2006 , pp. 451-460 More about this Journal
Abstract
While sludge settles down in a batch column, sludge concentration becomes high. Sludge concentration change is one of the most critical causes of the sludge settling velocity variation. Therefore, sludge concentration change causes sludge index to change. SVI is more sensitive than other sludge indexes to the change of sludge concentration. And if sludge-water interface has reached final height within 30minutes, SVI is not suitable for prediction of sludge settling characteristic, Therefore, SVIs of each sludge are, in some cases, different although each sludge has the same settling velocity. But SVI has been widely used to interpret sludge settling characteristic by a simple testing method. This work has two purposes. The first purpose is to predict sludge settling velocity by using sludge-water interface settling velocity. And the second purpose is to develop new sludge settling characteristic index to exactly interpret sludge settling characteristic by overcoming the limit of SVI.
Keywords
Sludge settling characteristic; Sludge settling velocity; Sludge-water interface; SVI;
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