Anaerobic digester feed stream conditioning for increasing biogas production (Technical report 6)

Ng, Wun Jern and Trzcinski, Antoine and Tian, Xinbo (2013) Anaerobic digester feed stream conditioning for increasing biogas production (Technical report 6). Project Report. Unpublished . [Report]

Abstract

In the sixth report, quantitative results of the molecular weight (MW) distribution of the soluble substances in raw and ultrasonicated sludge were obtained. These results confirmed that ULS has an impact on the various sizes as described in the fifth report. The concentration of each molecular weight range increased after ultrasonication in terms of absolute mass. The mass increase of high MW components (MW > 500 kDa) was found to be the most significant. In terms of mass percentage, the high MW components increased while a decrease in percentage was observed for compounds with MW lower than 5 kDa. When applying ultrasound only on the sludge supernatant (By discarding the solids beforehand), it was found that ultrasound hardly had an impact on the low MW organics.

Biochemical methane potential assays were conducted for sequential combination of ultrasound and ozone (ULS-Ozone) pre-treated sludge. An increase of 34.7% in biodegradability was found when 9 kJ/g TS ultrasonication and 0.036 g O3/g TS were sequentially combined. This was 7% more than the sum of individual treatment’s biodegradability.

Preliminary central composite design (CCD) tests with Design expert 8.0 was conducted for combined ULS-ALK pre-treatment. Ultrasonic energy input was found to be an important influencing factor in the ULS-ALK pre-treatment. It had a good interaction with the total solids concentration and NaOH concentration. Power density was found to be not influential in the combined ULS-ALK pre-treatment.


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Item Type: Report (Project Report)
Item Status: Live Archive
Additional Information: Unpublished report.
Faculty / Department / School: No Faculty
Date Deposited: 30 Jul 2018 07:15
Last Modified: 30 Jul 2018 07:15
Uncontrolled Keywords: biogas production
Fields of Research : 09 Engineering > 0904 Chemical Engineering > 090409 Wastewater Treatment Processes
09 Engineering > 0907 Environmental Engineering > 090703 Environmental Technologies
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
URI: http://eprints.usq.edu.au/id/eprint/34522

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