Enhancing sewage sludge anaerobic 're-digestion' with combinations of ultrasonic, ozone and alkaline treatments
Article
Article Title | Enhancing sewage sludge anaerobic 're-digestion' with combinations of ultrasonic, ozone and alkaline treatments |
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ERA Journal ID | 200987 |
Article Category | Article |
Authors | Tian, Xinbo (Author), Trzcinski, Antoine Prandota (Author), Lin, Leonard Li (Author) and Ng, Wun Jern (Author) |
Journal Title | Journal of Environmental Chemical Engineering |
Journal Citation | 4 (4), pp. 4801-4807 |
Number of Pages | 7 |
Year | 2016 |
Place of Publication | Netherlands |
ISSN | 2213-3437 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.jece.2016.10.032 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S221334371630392X |
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. |
Keywords | Sewage sludge; ultrasound; ozone; alkaline; anaerobic digestion; post-treatment. |
ANZSRC Field of Research 2020 | 400410. Wastewater treatment processes |
410404. Environmental management | |
401102. Environmentally sustainable engineering | |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | Nanyang Technological University, Singapore |
Public Utilities Board, Singapore | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q3q4z/enhancing-sewage-sludge-anaerobic-re-digestion-with-combinations-of-ultrasonic-ozone-and-alkaline-treatments
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