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The Effect of Sludge Settling Characteristics on Sludge-Water Interface Height Change Model  

Park, Suk Gyun (광운대학교 환경공학과)
Kang, Seon-Hong (광운대학교 환경공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.20, no.1, 2006 , pp. 147-155 More about this Journal
Abstract
For the further study of the solids flux theory, several researchers have proposed models to predict sludge settling velocity for each different concentration by using sludge indexes, SVI, SSVI and $SSVI_{3.5}$. It is difficult to apply the above models to predict sludge-water interface height in a batch column because sludge settling velocity changes while sludge settle down. While sludge settle down in a batch column, sludge concentration becomes high. The sludge concentration change is one of the most critical causes of the change of sludge settling velocity. Also, sludge concentration change causes of sludge index to change. SVI is more sensitive than SSVI or $SSVI_{3.5}$ to the change of sludge concentration. Each sludge has physical characteristics of its own which makes the settling velocity for each sludge different. The purpose of this study is to establish the correction factors that are able to compensate the errors derived from each different sludge settling characteristic by using sludge indexes, therefore the correction factors are applicable to the model for the change of sludge-water interface height.
Keywords
Sludge settling; Settling velocity; Sludge-water interface; SVI; SSVI; $SSVI_{3.5}$;
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