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) |
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| 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: | 09 Jul 2018 02:45 |
| 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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