Insights on the solubilization products after combined alkaline and ultrasonic pre-treatment of sewage sludge

Tian, Xinbo and Wang, Chong and Trzcinski, Antoine Prandota and Lin, Leonard and Ng, Wun Jern (2015) Insights on the solubilization products after combined alkaline and ultrasonic pre-treatment of sewage sludge. Journal of Environmental Sciences (China), 29. pp. 97-105. ISSN 1001-0742

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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.


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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.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 18 May 2016 23:49
Last Modified: 20 Jul 2018 04:56
Uncontrolled Keywords: ultrasound; alkali; sewage sludge; molecular weight; excitation emission matrix (EEM); anaerobic biodegradability
Fields of Research : 05 Environmental Sciences > 0502 Environmental Science and Management > 050205 Environmental Management
Identification Number or DOI: 10.1016/j.jes.2014.07.024
URI: http://eprints.usq.edu.au/id/eprint/28558

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