Enhancing sewage sludge anaerobic 're-digestion' with combinations of ultrasonic, ozone and alkaline treatments

Tian, Xinbo and Trzcinski, Antoine Prandota and Lin, Leonard Li and Ng, Wun Jern (2016) Enhancing sewage sludge anaerobic 're-digestion' with combinations of ultrasonic, ozone and alkaline treatments. Journal of Environmental Chemical Engineering, 4 (4). pp. 4801-4807.

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Abstract

This study investigated the feasibility of using ultrasonic (ULS), ozone assisted ultrasonic (ULS-Ozone) and alkaline assisted ultrasonic (ULS+ALK) post-treatment to target the persistent organic fraction in anaerobically digested sludge in order to increase methane recovery. Synergistic COD solubilization in digested sludge was observed when ozone (0.012 g O3 g-1 TS) and alkaline (0.02M for 10 min.) treatment was combined with ULS treatment. The digested sludge Soluble Chemical Oxygen Demand (SCOD) increased from 200 mg/L to 1,500, 2,600 and 2,650 mg/L after the ULS, ULS-Ozone and ULS+ALK treatments, respectively. Different compounds were, however, solubilized after the ULS-Ozone and ULS+ALK treatments as indicated by size exclusion chromatography (SEC). ULS+ALK treatment primarily solubilized macromolecules with molecular weight (MW) over 500 kDa; while, the ULS-Ozone treatment solubilized macromolecules with MW higher than 500 kDa and also organics with MW around 103 kDa. The methane production from “re-digestion” of the treated digested sludge increased by 28.3%, 48.3% and 39.5% after the ULS, ULS-Ozone and ULS+ALK treatments, respectively.


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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. Permanent restricted access to Published version due to publisher copyright policy.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 20 Feb 2017 03:03
Last Modified: 06 Mar 2018 06:57
Uncontrolled Keywords: Sewage sludge; ultrasound; ozone; alkaline; anaerobic digestion; post-treatment.
Fields of Research : 09 Engineering > 0904 Chemical Engineering > 090409 Wastewater Treatment Processes
05 Environmental Sciences > 0502 Environmental Science and Management > 050205 Environmental Management
09 Engineering > 0907 Environmental Engineering > 090703 Environmental Technologies
Socio-Economic Objective: D Environment > 96 Environment > 9611 Physical and Chemical Conditions of Water > 961101 Physical and Chemical Conditions of Water for Urban and Industrial Use
Identification Number or DOI: 10.1016/j.jece.2016.10.032
URI: http://eprints.usq.edu.au/id/eprint/29932

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