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Title: Interpreting the synergistic effect in combined ultrasonication-ozonation sewage sludge pre-treatment
Authors: Tian, Xinbo
Wang, Chong
Trzcinski, Antoine Prandota
Lin, Leonard
Ng, Wun Jern
Keywords: DRNTU::Engineering::Environmental engineering::Waste management
Issue Date: 2015
Source: Tian, X., Wang, C., Trzcinski, A. P., Lin, L., & Ng, W. J. (2015). Interpreting the synergistic effect in combined ultrasonication-ozonation sewage sludge pre-treatment. Chemosphere, 140, 63-71.
Series/Report no.: Chemosphere
Abstract: The sequential combination of ultrasonication and ozonation as sewage sludge treatment prior to anaerobic digestion was investigated. Synergistic volatile suspended solids (VSS) solubilization was observed when low energy ultrasonication (<12 kJ g−1 TS) was followed by ozonation. 0.048 g O3 g−1 TS ozonation induced the maximum VSS solubilization of 41.3% when the sludge was pre-ultrasonicated at 9 kJ g−1 TS; while, the same ozone dosage applied without prior ultrasonication only induced 21.1% VSS solubilization. High molecular weight (MW) components (MW > 500 kDa) were found to be the main solubilization products when sludge was only ozonated. However, solubilization products by ozone were mainly in the form of low MW components (MW < 27 kDa) when sludge was pre-ultrasonicated. The high MW products generated by ultrasound were effectively degraded in the subsequent ozonation. Anaerobic biodegradability increased by 34.7% when ultrasonication (9 kJ g−1 TS) and ozonation (0.036 g O3 g−1 TS) were combined sequentially. The maximum methane production rate increased from 3.53 to 4.32, 4.21 and 4.54 mL CH4 d−1 after ultrasonication, ozonation and ultrasonication–ozonation pre-treatments, respectively.
ISSN: 0045-6535
DOI: 10.1016/j.chemosphere.2014.09.007
Rights: © 2014 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Chemosphere, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles
NEWRI Journal Articles

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