Combined ultrasonication and thermal pre-treatment of sewage sludge for increasing methane production

Trzcinski, Antoine Prandota and Tian, Xinbo and Wang, Chong and Lin, Leonard Li and Ng, Wun Jern (2015) Combined ultrasonication and thermal pre-treatment of sewage sludge for increasing methane production. Journal of Environmental Science and Health - Part A Toxic Hazardous Substances and Environmental Engineering, 50 (2). pp. 213-223. ISSN 1093-4529

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This article focuses on the combination of ultrasonic and thermal treatment of sewage sludge (SS). The combination involved ultrasonicating a fraction of the sludge and thermal treatment at various temperatures and this resulted in solubilization of proteins and carbohydrates, and so contributing to increased COD solubilization. During the treatment, SCOD, soluble proteins and carbohydrates increased from 760 mg L-1 to 10,200 mg L-1, 110 mg L-1 to 2,900 mg L-1 and 60 mg L-1 to 630 mg L-1, respectively. It was found ultrasonication of only a fraction of the sludge (>20%) followed by thermal treatment led to significant
improvement compared to thermal and ULS treatments applied on their own. At 65�C, the kinetic of solubilization was improved and the hyper-thermophilic treatment time could be reduced to a few hours when ultrasonication was used first. A linear correlation (R2 D 95%) was found between the SCOD obtained after ultrasonication pre-treatment and anaerobic biodegradability. The combined treatment resulted in 20% increase in biogas production during the anaerobic digestion of the pre-treated sludge.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Accepted version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 18 May 2016 23:49
Last Modified: 18 Jul 2018 04:28
Uncontrolled Keywords: anaerobic biodegradability; thermal pre-treatment; ultrasonication; Waste Activated Sludge (WAS)
Fields of Research : 05 Environmental Sciences > 0502 Environmental Science and Management > 050205 Environmental Management
Identification Number or DOI: 10.1080/10934529.2014.975561

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