Journal of the Korea Organic Resources Recycling Association (유기물자원화)

Korea Organic Resources Recycling Association (유기성자원학회)
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Variation in Physicochemical Properties and Anaerobic Digestion Efficiency by Thermal-alkali Pre-treatment (THAP) Factors

열화학적 가수분해 영향인자에 따른 물리화학적 특성 변화 및 혐기성소화 효율 평가

  • Park, Seyong (Bioresource Center, Institute for Advanced Engineering) ;
  • Han, Sungkuk (Bioresource Center, Institute for Advanced Engineering) ;
  • Song, Eunhey (Bioresource Center, Institute for Advanced Engineering) ;
  • Kim, Choonggon (Bioresource Center, Institute for Advanced Engineering) ;
  • Lee, Wonbae (Department of Civil & Environmental Engineering, Hanyang University)
  • 박세용 (고등기술연구원 바이오자원순환센터) ;
  • 한성국 (고등기술연구원 바이오자원순환센터) ;
  • 송은혜 (고등기술연구원 바이오자원순환센터) ;
  • 김충곤 (고등기술연구원 바이오자원순환센터) ;
  • 이원배 (한양대학교 건설환경공학과)
  • Received : 2019.07.16
  • Accepted : 2019.08.14
  • Published : 2019.09.30
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Abstract

In this study, thermal-alkali pre-treatment (THAP) optimal condition and co-digestion efficiency with THAP of the mixture food waste and sewage sludge were evaluated for improving the performances of co-digestion for mixed food waste and sewage sludge. The optimal condition of THAP was evaluated for solubilization COD, CST(Capillary Suction Time), TTF(Time to Filter), and volatile fatty acids (VFAs) with THAP temperature and NaOH concentration. In addition, the co-digestion of mixed food waste and sewage sludge were evaluated using biochemical methane potential (BMP) test. The optimal THAP reaction temperature and NaOH concentration of food waste and sewage sludge were $140^{\circ}C$ and 60 meq/L to solubilization COD over 20%, CST and TTF under 60sec and VFAs concentration over 12,000 mg-COD/L, respectively. The optimal condition of co-digestion of mixed food waste and sewage sludge equal to THAP condition. Therefore, it was determined that the optimal condition of THAP reaction temperature and NaOH concentration for co-digestion of mixed food waste and sewage sludge were $140^{\circ}C$ and 60 meq/L, respectively.

본 연구에서는 음식물류 폐기물과 하수슬러지의 효과적인 병합 혐기성 처리를 위한 열화학적 가수분해 방법의 최적 조건 평가와, 열화학적 가수분해에 따른 병합 혐기성 소화 효율에 대해 평가 하였다. 열화학적 가수분해는 온도 (80, 100, 120, 140, 160, $180^{\circ}C$)와 NaOH (5, 20, 40, 60, 100 meq/L) 조건에 따른 solubilization COD, CST(Capillary Suction Time), TTF(Time to Filter), volatile fatty acids (VFAs) 등에 대해 평가를 하였으며, 병합 혐기성 소화 효율평가는 biochemical methane potential (BMP) test를 통해 평가하였다. 실험결과 음식물류폐기물과 하수슬러지의 열화학적 가수분해 시 온도 $140^{\circ}C$, NaOH 60 meq/L에서 solubilization COD 20 % 이상, CST와 TTF가 60초 이하, VFAs 농도가 12,000 mg-COD/L 이상으로 최적조건으로 규명되었다. 병합 혐기성 소화 결과도 열화학적 가수분해 조건과 동일한 조건에서 가스발생량이 가장 높았다. 따라서, 음식물류폐기물과 하수슬러지의 효과적인 병합혐기성소화를 위한 열화학적 가수분해 전처리 조건은 온도 $140^{\circ}C$, NaOH 주입농도 60 meq/L라 판단된다.

Keywords

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