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Evaluation of COD Solubilization and Reduction of Waste Activated Sludge by pH Control  

Kim, Youn Kwon (한국수자원공사 수자원연구원 상하수도연구소)
Moon, Yong Taik (한국수자원공사 수자원연구원 상하수도연구소)
Kim, Ji Yeon (한국수자원공사 수자원연구원 상하수도연구소)
Seo, In Seok (한국수자원공사 수자원연구원 상하수도연구소)
Publication Information
Journal of Korean Society of Water and Wastewater / v.21, no.5, 2007 , pp. 551-558 More about this Journal
Abstract
From the view point of biological wastewater treatment, C/N ratio is one of the most important factor in biological nutrient removal process. However, municipal sewage in Korea is characterized by extremely low content of carbon source and relatively higher portion of N source. Accordingly, it is necessary to dose external carbon source in order to obtain higher degree of carbon source within the process. In this study, the effects of pH pretreatment as an alternative plan for increasing carbon source on the cell disruption and COD solubility of waste activated sludge were conducted under well defined experimental conditions. During 5 hours, the value of COD solubilization rate ($S_R$) at pH 11.5 is approximately 4.4 times higher than the value of $S_R$ at pH 9.5. It is expected that the level of SCOD increased due to the result from cell disruption. However, VSS/TSS ratio was not significantly changed after 5 hours. As Alkalinity changes gradually from less than 15, 30 and 60 meq NaOH/L, average RBCOD/SCOD fraction showed 34, 36 and 45%,respectively.
Keywords
Waste activated sludge; pH control; COD solubilization; RBCOD fraction;
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