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Biosorption Characteristics of Organic Matter in a Sequencing Batch Reactor : Effect of Sludge Retention Time  

Kim, Keum-Yong (Department of Environmental Engineering, Chungbuk National University)
Kim, Jin-Hyung (Department of Environmental Engineering, Chungbuk National University)
Kim, Dae-Keun (Department of Environmental Engineering, Chungbuk National University)
Ryu, Hong-Duck (Department of Environmental Engineering, Chungbuk National University)
Lee, Sang-Ill (Department of Environmental Engineering, Chungbuk National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.30, no.2, 2008 , pp. 175-180 More about this Journal
Abstract
The objective of this study was to investigate biosorption of organic matter on EPS(Extracellular Polymeric Substances) at different SRT(Sludge Retention Time) in a SBR(Sequencing Batch Reactor) process, which was operated with the following operation steps : Fill-React-Settle-Decant-Idle. The hydraulic retention time was set to be 24 hours. The results obtained from this study showed that the organic removal efficiency per unit microbial biomass decreased with increasing SRT, and the corresponding EPS amount also did. The percent removal of organic by biosorption increased with SRT, and it reached to 53.2% at SRT of 30 days. However, the highest biosorption per microbial biomass(48.6 mgCOD/gVSS) was found at SRT of 2 days. The EPS analysis was performed by measuring TSS, TCOD$_{Cr}$, and TKN. The EPS production per unit microbial biomass was observed to be high at a low SRT. Due to the above result, the floc formation was hindered and therefore poor settlement of sludge resulted in decreasing the COD removal efficiency. It was therefore concluded that the consideration of the system design should include the characteristic of EPS as well as other factors such as SRT, MLSS, and organic loading.
Keywords
Sequencing Batch Reactor; Sludge Retention Time; Biosorption; Extracellular Polymeric Substances;
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