Parameters affecting the stability of the digestate from a two-stage anaerobic process treating the organic fraction of municipal solid waste

Trzcinski, Antoine P. and Stuckey, David C. (2011) Parameters affecting the stability of the digestate from a two-stage anaerobic process treating the organic fraction of municipal solid waste. Waste Management , 31 (7). pp. 1480-1487. ISSN 0956-053X

Abstract

This paper focused on the factors affecting the respiration rate of the digestate taken from a continuous anaerobic two-stage process treating the organic fraction of municipal solid waste (OFMSW). The process involved a hydrolytic reactor (HR) that produced a leachate fed to a submerged anaerobic membrane bioreactor (SAMBR). It was found that a volatile solids (VS) removal in the range 40–75% and an operating temperature in the HR between 21 and 35 degrees C resulted in digestates with similar respiration rates, with all digestates requiring 17 days of aeration before satisfying the British Standard Institution stability threshold of 16 mg CO2 g VS-1 day-1. Sanitization of the digestate at 65 degrees C for 7 days allowed a mature digestate to be obtained. At 4 g VS L-1 d-1 and Solid Retention imes (SRT) greater than 70 days, all the digestates emitted CO2 at a rate lower than 25 mg CO2 g VS-1 d-1 after 3 days of aeration, while at SRT lower than 20 days all the digestates displayed a respiration rate greater than 25 mg CO2 g VS-1 d-1. The compliance criteria for Class I digestate set by the European Commission (EC) and British Standard Institution (BSI) could not be met because of nickel and chromium contamination, which was probably due to attrition of the stainless steel stirrer in the HR.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 14 Jul 2016 23:39
Last Modified: 09 Feb 2017 04:26
Fields of Research : 05 Environmental Sciences > 0502 Environmental Science and Management > 050205 Environmental Management
09 Engineering > 0907 Environmental Engineering > 090703 Environmental Technologies
Identification Number or DOI: 10.1016/j.wasman.2011.02.015
URI: http://eprints.usq.edu.au/id/eprint/28938

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