신재생에너지 (New & Renewable Energy)

  • 제10권1호
  • /
  • Pages.20-29
  • /
  • 2014
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  • 1738-3935(pISSN)
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  • 2713-9999(eISSN)
한국신·재생에너지학회 (Korean Society for New and Renewable Energy)
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잉여슬러지의 열적가용화를 통한 가용화 및 혐기성소화 생분해도 향상

Enhancement of Anaerobic Biodegradability and Solubilization by Thermal Pre-treatment of Waste Activated Sludge

  • 정성엽 (경기대학교 환경에너지공학과) ;
  • 정석영 (경기대학교 환경에너지공학과) ;
  • 장순웅 (경기대학교 환경에너지공학과)
  • Jeong, Seongyeob (Department of Environmental Energy Engneering, Kyonggi University) ;
  • Jung, Sukyoung (Department of Environmental Energy Engneering, Kyonggi University) ;
  • Chang, Soonwoong (Department of Environmental Energy Engneering, Kyonggi University)
  • 투고 : 2013.12.04
  • 심사 : 2014.02.28
  • 발행 : 2014.03.25
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초록

The present study investigated the effects of thermal pre-treatment on the enhancement of anaerobic biodegradability of waste activated sludge at varied TS concentration levels. The activated sludges were thermally oxidized for 30 minutes at $80{\sim}200^{\circ}C$ with varied TS concentrations (2%, 4% and 6%). and then, sludge characteristics, solubilization efficiency and methane production yield of thermally pre-treated sludges were analyzed. The higher the temperature in the thermal pre-treatment, the higher the concentration levels of dissolved matters such as $SCOD_{Cr}$, $NH_4{^+}$ and VFAs, which indicates that the thermal pre-treatment facilitates the hydrolysis and acid fermentation. Furthermore, the solubilization efficiency was increased in proportion to the temperature rise at all TS concentrations and was reached at 68.9%, 55.6% and 53.1%, respectively, at $200^{\circ}C$. In the BMP test of the pre-treated sludges, higher methane production yields were observed as 0.313. 0.314 and $0.299m^3\;CH_4/kg\;VS_{add}$ at the condition of TS 2% ($160^{\circ}C$), 4% ($160^{\circ}C$) and 6% ($180^{\circ}C$), respectively, and degradation rate was increased by 84%, 79% and 65% compared with non-pretreated waste activated sludge. These findings suggest the effectiveness of thermal pre-treatment of waste activated sludge for anaerobic biodegradable process.

키워드

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피인용 문헌

  1. A Study on Characteristics of Solubilization and Biogas Production for Sewage Sludge using Thermal Pretreatment vol.24, pp.2, 2015, https://doi.org/10.7844/kirr.2015.24.2.46