Impact of ozone assisted ultrasonication pre-treatment on anaerobic digestibility of sewage sludge

Tian, Xinbo and Trzcinski, Antoine Prandota and Lin, Li leonard and Ng, Wun Jern (2015) Impact of ozone assisted ultrasonication pre-treatment on anaerobic digestibility of sewage sludge. Journal of Environmental Sciences, 33. pp. 29-38. ISSN 1001-0742

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Abstract

Impact of ultrasonication (ULS) and ultrasonication-zonation (ULS-Ozone) pre-treatment on the anaerobic digestibility of sewage sludge was investigated with semi-continuous anaerobic reactors at solid retention time (SRT) of 10 and 20 days. The control, ULS and ULS-Ozone reactors produced 256, 309 and 348 mL biogas/g CODfed and the olatile solid (VS) removals were 35.6%, 38.3% and 42.1%, respectively at SRT of 10 days. At SRT of 20 days, the biogas yields reached 313, 337 and 393 mL biogas/g CODfed and the VS removal rates were 37.3%, 40.9% and 45.3% in the control, ULS and ULS-Ozone reactors, respectively.
ULS-Ozone pre-treatment increased the residual organic amount in the digested sludge. These soluble residual organics were found to contain macromolecules with molecular weights (MW) larger than 500 kDa and smaller polymeric products with MW around 19.4 and 7.7 kDa. These compounds were further characterized to be humic acid-like substances with fluorescent spectroscopy analysis.


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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 / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 06 Oct 2016 04:13
Last Modified: 23 Jul 2018 02:17
Uncontrolled Keywords: sewage sludge; ultrasound; ozone; pre-treatment; molecular weight; anaerobic digestion
Fields of Research : 09 Engineering > 0904 Chemical Engineering > 090409 Wastewater Treatment Processes
05 Environmental Sciences > 0502 Environmental Science and Management > 050205 Environmental Management
Socio-Economic Objective: D Environment > 96 Environment > 9609 Land and Water Management > 960912 Urban and Industrial Water Management
Identification Number or DOI: 10.1016/j.jes.2015.01.003
URI: http://eprints.usq.edu.au/id/eprint/29812

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