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Sludge Reduction by Mechanical Solubilization in the Aerobic Digestion  

Youn, Sang Hyun (경희대학교 환경응용화학대학 및 환경연구센터)
Jang, Hyun-sup (경희대학교 환경응용화학대학 및 환경연구센터)
Hwang, Sun-jin (경희대학교 환경응용화학대학 및 환경연구센터)
Publication Information
Journal of Korean Society of Water and Wastewater / v.20, no.5, 2006 , pp. 763-770 More about this Journal
Abstract
The purpose of this study was to investigate the effects of mechanical(ball-mill) solubilization of excess sludge especially focused on the TSS(total suspended solid) reduction during the conventional aerobic digestion of sewage sludges including primary and/or excess sludge, HRT was examined at the 10 days and 20 days. According to the results of this study, TSS removal efficiency of solubilized excess sludge was almost two times higher than that of non-solubilized excess sludge. And as the proportion of the primary sludge increased, TSS removal efficiency became worse because primary sludge rarely contained microbial cells which could be easily solubilized physically. It was also proved that by the application of proper solubilization techniques to the excess sludge, HRT for the aerobic digestion could be lessened(above 50%) dramatically keeping the same or better digestion performance. The fact that between primary and excess sludges, only the excess sludge is quite effective in the sludge solubilization and in it's reduction says that excess sludge releasing sources are key-point in the sludge cake reduction field as a source control.
Keywords
sludge reduction; solubilization; aerobic digestion; ball mill;
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