Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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A Study on Characteristics of Solubilization and Biogas Production for Sewage Sludge using Thermal Pretreatment

열적가용화공정을 이용한 하수슬러지의 가용화 특성 및 바이오가스 생산량 평가

  • Jeong, Seong-Yeob (Department of Environmental Energy Engineering, Kyonggi University) ;
  • Yeon, Ho-Suk (Department of Environmental Energy Engineering, Kyonggi University) ;
  • Lee, Chang-Yeol (Department of Environmental Energy Engineering, Kyonggi University) ;
  • Lee, Jong-In (SK chemical Co., Ltd.) ;
  • Chang, Soon-Woong (Department of Environmental Energy Engineering, Kyonggi University)
  • 정성엽 (경기대학교 환경에너지공학과) ;
  • 연호석 (경기대학교 환경에너지공학과) ;
  • 이창열 (경기대학교 환경에너지공학과) ;
  • 이종인 (SK케미칼(주)) ;
  • 장순웅 (경기대학교 환경에너지공학과)
  • Received : 2015.02.10
  • Accepted : 2015.04.06
  • Published : 2015.04.30
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Abstract

In this study, an applicability of thermal pretreatment for primary and secondary sludge, which are generated in a sewage treatment plant, was evaluated. The efficiency and charateristics was investigated with each sludge after pretreatment under the condition of $100{\sim}220^{\circ}C$ for 30 minutes. As the result, it was found that $SCOD_{Cr}$, $NH_4{^+}$, VFAs concentrations increased as the pre-treatment temperature increased. For COD solubilization, it was also highly dependent on an increase of temperature resulting in acceleration on hydrolysis and acid fermentation. In the BMP (Biochemical Methane Potential) experiment, for the primary sludge, it showed the higher biogas production rate at a temperature of $220^{\circ}C$, however, the effect was insignificant (5.6%). Whereas, for the secondary sludge, the increase on biogass production rate was 38.8% ($180^{\circ}C$) and this means that the secondary sludge is more suitable for an applicability of thermal pretreatment.

본 연구는 하수처리장에서 발생되는 생슬러지와 잉여슬러지를 대상으로 열적가용화 공정의 적용성을 평가하였다. 열적가용화 효율 및 특성평가는 각 슬러지를 대상으로 $100{\sim}220^{\circ}C$ 온도범위에서 30분간 전처리를 수행한 후 실시되었다. 그 결과, 가용화 온도가 상승함에 따라 $SCOD_{Cr}$, $NH_4{^+}$, VFAs 농도가 증가하는 경향을 확인할 수 있었다. 또한 COD 가용화효율 평가 결과, 온도 상승에 비례하는 경향이 나타나 열적가용화에 의해 가수분해 및 산발표 단계를 촉진시킨 것으로 판단된다. BMP (Biochemical Methane Potential) 실험을 통해 생슬러지의 경우 $220^{\circ}C$에서 가장 높은 biogas 생산량을 보여주었으나, 증가율은 5.6%로 열적가용화에 의한 효과가 미미한 것으로 나타났다. 반면 잉여슬러지의 경우 최대 38.8% ( $180^{\circ}C$) 증가하여, 열적가용화 공정은 잉여슬러지에 대한 적용성이 더욱 우수한 것으로 나타났다.

Keywords

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