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Effect of Feed concentration (S0) and F/M ratio (S0/X0) on Anaerobic Digestion of Thickened Sewage Sludge

기질 농도 (S0)와 F/M 비 (S0/X0)가 농축 하수 슬러지 혐기성 소화에 미치는 영향

  • Kim, Sang-Hyoun (Department of Environmental Engineering, Daegu University) ;
  • Ju, Hyun Jun (Department of Environmental Engineering, Daegu University)
  • 김상현 (대구대학교 환경공학과) ;
  • 주현준 (대구대학교 환경공학과)
  • Received : 2012.11.02
  • Accepted : 2012.12.05
  • Published : 2012.12.15

Abstract

The retrofitting of a thickening unit process is widely considered in municipal wastewater treatment plants in Korea to enhance the anaerobic digestion efficiency. The authors examined the effect of feed concentration (2-34.1 g VS/L) and feed to microorganism (F/M) ratio (0.50-1.35 g VS/g VS) on anaerobic batch digestion of sewage sludge. Methane yield over 90 mL $CH_4/g$ $VS_{feed}$ was found at a feed concentration in the range of 12-26 g VS/L and a F/M ratio below 0.6 g VS/g VS. A high F/M ratio decreased methane yield and rate with oragnic acid accumulation. As sudden increase of sewage sludge concentration prior to anaerobic digestion would jeopardize the digester performance due to the rasied F/M ratio, gradual increase of the sludge feed concentration or an additional biomass retention in the digester is recommended.

Acknowledgement

Supported by : 대구대학교

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