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Lookup NU author(s): Dr Burhan Shamurad,
Professor Neil Gray,
Dr Evangelos Petropoulos,
Dr Jan Dolfing,
Dr Paul Sallis
This is the authors' accepted manuscript of an article that has been published in its final definitive form by American Chemical Society , 2020.
For re-use rights please refer to the publisher's terms and conditions.
A low-cost approach for enhancing mesophilic (37oC) anaerobic digestion (AD) of organic waste using a low temperature (37oC) pre-treatment with different mineral wastes (MW) was investigated. A higher and stable methane production rate, in comparison to MW-free controls, was achieved for 80 days at organic loading rates of 1 – 2 g VS/L. d, using a feed substrate pre-treated with incinerator bottom ash (IBA). The boiler ash and cement-based waste pre-treatments also produced high methane production rates but with some process instability. In contrast, an incinerator fly ash pre-treatment showed a progressive decrease in methane production rates and poor process stability, leading to reactor failure after 40 days. To avoid process instability and /or reactor failure two metrics had to be met: a) a methanogenesis to fermentation ratio higher than 0.6 and b) a cell specific methanogenic activity to cell specific fermentation activity ratio of > 1000. The prevalence of Methanofastidiosum together with a mixed community of acetoclastic (Methanosaeta) and hydrogenotrophic (Methanobacterium) methanogens in the stable IBA treatment indicated the importance of Methanofastidiosum as a potential indicator of a healthy and stable reactor.
Author(s): Shamurad B, Gray N, Petropoulos E, Dolfing J, Quintela-Baluja M, Bashiri R, Tabraiz S, Sallis P
Publication type: Article
Publication status: Published
Journal: Environmental Science and Technology
Print publication date: 21/07/2020
Online publication date: 17/06/2020
Acceptance date: 17/06/2020
Date deposited: 03/07/2020
ISSN (electronic): 1382-3124
Publisher: American Chemical Society
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