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Characteristics of Anaerobic Methane Production by Ultrasonic Treatment of Excess Sludge  

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)
Publication Information
Journal of Korean Society on Water Environment / v.26, no.5, 2010 , pp. 810-815 More about this Journal
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
Anaerobic digestion; Methane; Pretreatment; Sludge hydrolysis; Ultrasound;
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Times Cited By KSCI : 4  (Citation Analysis)
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