Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Characteristics of Anaerobic Methane Production by Ultrasonic Treatment of Excess Sludge

잉여슬러지의 초음파 처리에 의한 혐기성 소화에서의 메탄생성 특성 연구

  • Lee, Jonghak (Division of Environmental Engineering, Yonsei University) ;
  • Jeong, Tae-Young (Division of Environmental Engineering, Yonsei University) ;
  • Roh, Hyun-Seog (Division of Environmental Engineering, Yonsei University) ;
  • Kim, Dongjin (Department of Environmental Sciences and Biotechnology, Hallym University)
  • 이종학 (연세대학교 환경공학부) ;
  • 정태영 (연세대학교 환경공학부) ;
  • 노현석 (연세대학교 환경공학부) ;
  • 김동진 (한림대학교 환경생명공학과)
  • Received : 2010.06.08
  • Accepted : 2010.08.10
  • Published : 2010.09.30
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Abstract

Ultrasonic sludge pre-treatment has been studied to enhance the performance of anaerobic digestion by increasing sludge hydrolysis which is regarded as the rate-limiting-step of anaerobic digestion. In this study, the effect of ultrasonic pre-treatment on sludge hydrolysis (solubilization) and methane production was investigated. Sludge solubilization efficiency increased with ultrasonic energy input. However, it is uneconomical to apply more than 720 kJ/L as the solubilization efficiency per energy input declines afterwards. Volatile fatty acids concentration increased after the ultrasonic sludge hydrolysis. Anaerobic batch digestion showed that methane volume reached 64.7 and 84.5 mL after 18 days of incubation with the control sludge and ultrasonically hydrolyzed sludge, respectively. Methane production potential, maximum methane production rate, and the lag time of modified Gompertz equation were changed from 70 mL, 6.4 mL/day, and 1.2 days to 89 mL, 9.6 mL/day, and 0.5 day, respectively, after the ultrasonic sludge treatment. The results proved that ultrasonic pre-treatment contributed significantly not only for the methane production but also for the reduction of anaerobic digestion time which is critical for the performance of anaerobic sludge digestion.

Keywords

References

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