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Predicting the effects of integrating mineral wastes in anaerobic digestion of OFMSW using first-order and Gompertz models from biomethane potential assays

Lookup NU author(s): Dr Burhan ShamuradORCiD, Emeritus Professor Neil GrayORCiD, Dr Evangelos Petropoulos, Shamas Tabraiz, Edward MEMBERE, Dr Paul Sallis

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by Elsevier, 2020.

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Abstract

Previous studies found mineral wastes (MW; incineration bottom ash (IBA), cement based waste (CBW), Fly ash (FA) and boiler ash (BA) are a promising resource for the macro-/micronutrients necessary for anaerobic digestion (AD) processes. The current study used first-order and modified Gompertz models from BMP assays to investigate the effects of integrating MW on the AD of OFMSW at 37 °C. Results from the first-order model showed a 45% increase in the specific growth rate of microorganisms (μ) in the MW- supplemented BMP compared to the control. Gompertz model results indicated that the IBA, CBW, FA and BA BMP amended assays obtained the highest K values (45–54 mL CH4 g VS−1 d−1) than the control (K ∼ 31 mL CH4 g VS−1 d−1), with no significant adverse effects of co-digestion of OFMSW with MW on the length of the lag phase (λ) in BMP assays (λ = 1.89 ± 0.07 days for IBA, CBW and BA amended assays compared to 1.5 ± 0.01 days for the control). However, FA amended assays had a greater λ value (3.66 ± 0.1 days). The MW provided both alkalinity and released several trace elements at concentrations within the optimal ranges for methanogenic archaea.


Publication metadata

Author(s): Shamurad B, Gray N, Petropoulos E, Tabraiz S, Membere E, Sallis P

Publication type: Article

Publication status: Published

Journal: Renewable Energy

Year: 2020

Volume: 152

Pages: 308-319

Print publication date: 01/06/2020

Online publication date: 20/01/2020

Acceptance date: 15/01/2020

Date deposited: 21/01/2020

ISSN (print): 0960-1481

ISSN (electronic): 1879-0682

Publisher: Elsevier

URL: https://doi.org/10.1016/j.renene.2020.01.067

DOI: 10.1016/j.renene.2020.01.067


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