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Comparison of Single-stage Thermophilic and Mesophilic Anaerobic Sewage Sludge Digestion

단상 고온 및 중온 혐기성 하수 슬러지의 소화 공정 비교

  • Jang, Hyun Min (School of Environmental Science and Engineering, Gwangju Institute of Science and Technology,) ;
  • Choi, Suk Soon (Department of Biological and Environmental Engineering, Semyung University) ;
  • Ha, Jeong Hyub (Department of Integrated Environmental Systems, Pyeongtaek University)
  • 장현민 (광주과학기술원 환경공학부) ;
  • 최석순 (세명대학교 바이오환경공학과) ;
  • 하정협 (평택대학교 환경융합시스템학과)
  • Received : 2016.08.31
  • Accepted : 2016.09.19
  • Published : 2016.10.10

Abstract

In this study, single-stage continuous anaerobic reactors to treat sewage sludge were operated under different temperature (55 and $35^{\circ}C$; $R_{TAD}$ and $R_{MAD}$) to evaluate the reactor stability and performance of the thermophilic and mesophilic anaerobic digestion. During the overall digestion, both anaerobic reactors maintained quite stable and constant pH and total alkalinity (TA) values in the range of 6.5-8.0 and 3-4 g $CaCO_3/L$, respectively. After the start-up period, $R_{TAD}$ showed 10% higher VS removal efficiency than that of $R_{MAD}$ ($R_{TAD}$; 43.3%; $R_{MAD}$ : 33.6%). Although organic acids such as acetic and propionic acid were detected in both anaerobic reactors at the start-up period, all organic acids in $R_{TAD}$ and $R_{MAD}$ were consumed at the steady state condition. Also $R_{TAD}$ showed 31.4 % higher methane production rate (MPR) than that of $R_{MAD}$ at the steady state condition ($R_{TAD}$; 243 mL $CH_4/L/d$; $R_{MAD}$ : 185 mL $CH_4/L/d$). Meanwhile, the experimental results indicated similar methane yield between $R_{TAD}$ and $R_{MAD}$.

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