Tian, Xinbo and Trzcinski, Antoine (2017) Effects of physico-chemical post-treatments on the semi-continuous anaerobic digestion of sewage sludge. Environments, 4 (3). ISSN 2076-3298
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Abstract
Sludge production in wastewater treatment plants is increasing worldwide due to the increasing population. This work investigated the effects of ultrasonic (ULS), ultrasonic-ozone (ULS-Ozone) and ultrasonic + alkaline (ULS+ALK) post-treatments on the anaerobic digestion of
sewage sludge in semi-continuous anaerobic reactors. Three conditions were tested with different hydraulic retention times (HRT, 10 or 20 days) and sludge recycle ratios (R = QR/Qin (%): 50 or 100%). Biogas yield increased by 17.8% when ULS+ALK post-treatment was applied to the effluent of a
reactor operating at 20 days HRT and at a 100% recycle ratio. Operation at 10 days HRT also improved the biogas yield (277 mL CH4/g VSadded (VS: volatile solids) versus 249 mL CH4/g VSadded in the control). The tested post-treatment methods showed 4–7% decrease in effluent VS. The post-treatment resulted in a decrease in the cellular ATP (Adenosine tri-phosphate) concentration indicating stress imposed on microorganisms in the reactor. Nevertheless, this did not prevent higher biogas production. Based on the results, the post-treatment of digested sludge or treating the sludge between two digesters is an interesting alternative to pre-treatments.
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| Item Type: | Article (Commonwealth Reporting Category C) |
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| Refereed: | Yes |
| Item Status: | Live Archive |
| Additional Information: | Published version made available under Open Access. |
| Faculty/School / Institute/Centre: | Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 -) |
| Faculty/School / Institute/Centre: | Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 -) |
| Date Deposited: | 17 Nov 2017 02:16 |
| Last Modified: | 23 Apr 2018 03:51 |
| Uncontrolled Keywords: | sewage sludge; ultrasound; ozone; post-treatment; anaerobic digestion; biogas |
| Fields of Research (2008): | 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 Objectives (2008): | D Environment > 96 Environment > 9609 Land and Water Management > 960912 Urban and Industrial Water Management |
| Identification Number or DOI: | https://doi.org/10.3390/environments4030049 |
| URI: | http://eprints.usq.edu.au/id/eprint/32756 |
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