Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Evaluation of Physical Shear Pre-treatment and Biogas Characteristics using Mixed Sludge

물리적 파쇄 가용화를 이용한 혼합슬러지의 가용화 효율 및 바이오가스 특성 평가

  • Choi, Jae-Hoon (Department of Graduate School, Kyonggi University) ;
  • Jeong, Seong-Yeob (Environment Energy O&M Institute of Technology) ;
  • Kim, Ji-Tae (Department of Environmental Enggineering, Colleage of Engineering, Kyonggi University)
  • 최재훈 (경기대학교 일반대학원) ;
  • 정성엽 ((주)환경에너지오앤엠 기술연구소) ;
  • 김지태 (경기대학교 창의공과대학 환경에너지공학과)
  • Received : 2018.10.01
  • Accepted : 2019.07.18
  • Published : 2019.07.30
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Abstract

In this study, biodegradation efficiency improvement of mixed sludge for the anaerobic digestion process in wastewater treatment plant was investigated. In order to release the organic material contained in the sludge cell and promote the hydrolysis step, mixed sludge of 7% TS (Total Solids) was physically shear-treated at a shear strength of 1,000 ~ 4,000 rpm and a maximum of 120 mins. As a result of the comparison between mixed sludge before and after the treatment, the concentration of $SCOD_{Cr}$(Soluble Chemical Oxygen Demand-chromium method) was increased through the conversion of granular organic matter into dissolved organic matter as shear strength and treatment time increases. The solubilization efficiency increased rapidly after 30 min of solubilization application time, and they were 11.23 %, 20.10 %, 22.52 % and 25.43% at 120 min for each shear strength conditions, respectively. Additionally, the BMP(Biochemical Methane Potential) test was conducted with the optimized samples to determine the increase of methane production by the shear pre-treatment. Consequently, methane production of each samples were 0.275, 0.310, 0.323 and $0.335m^3/kg\;VS_{add}$, which indicates that methane production was increased to a maximum of 21.28% compared to the control without the solubilization process ($0.262m^3/kg\;VS_{add}$). As a result, the physical shear-treatment is a promising process for sewage sludge pre-treatment to reduce the organic waste and increase the energy production.

Keywords

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Fig. 1. Physical shear pre-treatment device

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Fig. 2. The impact of shear pre-treatment on characteristics　

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Fig. 3. The impact of shear pre-treatment on solubilization

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Fig. 4. Cumulative methane yield

Table 1. The characteristics of mixed sludge

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Table 2. The composition of anaerobic medium

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Table 3. The comparative of study of BMP test

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