Insights on the solubilization products after combined alkaline and ultrasonic pre-treatment of sewage sludge
Article
Article Title | Insights on the solubilization products after combined alkaline and ultrasonic pre-treatment of sewage sludge |
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ERA Journal ID | 124506 |
Article Category | Article |
Authors | Tian, Xinbo (Author), Wang, Chong (Author), Trzcinski, Antoine Prandota (Author), Lin, Leonard (Author) and Ng, Wun Jern (Author) |
Journal Title | Journal of Environmental Sciences |
Journal of Environmental Sciences (Huanjing Kexue Xuebao) | |
Journal Citation | 29, pp. 97-105 |
Number of Pages | 9 |
Year | 2015 |
Place of Publication | Netherlands |
ISSN | 0253-2468 |
1001-0742 | |
1878-7320 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.jes.2014.07.024 |
Web Address (URL) | http://www.sciencedirect.com/science/article/pii/S1001074214002800 |
Abstract | This work provides insights on the solubilization products after a simultaneous combination of alkaline and ultrasonic (ALK + ULS) pre-treatment of sewage sludge. Soluble chemical oxygen demand (SCOD) increased from 1200 to 11,000 mg/L after such treatment. Organics with molecular weight around 5.6 kDa were solubilized because of the synergistic effect of ultrasound and alkali. Organics with molecular weight larger than 300 kDa increased from 7.8% to 60%, 16% and 42.3% after ULS, ALK and ALK + ULS treatment, respectively. Excitation emission matrix fluorescence spectroscopy analysis identified soluble microbial product-like and humic acid-like matters as the main solubilization products. Sludge anaerobic biodegradability was significantly enhanced with the simultaneous application of ALK + ULS pre-treatment. ALK + ULS pre-treatment resulted in 37.8% biodegradability increase compared to the untreated sludge. This value was higher compared to the biodegradability increase induced by individual ALK pre-treatment (5.7%) or individual ULS pre-treatment (20.7%) under the same conditions applied. |
Keywords | ultrasound; alkali; sewage sludge; molecular weight; excitation emission matrix (EEM); anaerobic biodegradability |
ANZSRC Field of Research 2020 | 410404. Environmental management |
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/q34qz/insights-on-the-solubilization-products-after-combined-alkaline-and-ultrasonic-pre-treatment-of-sewage-sludge
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