Fungal solubilisation and subsequent microbial methanation of coal processing wastes

Journal article

Ahmed, A. and Sharma, Anima 2021. Fungal solubilisation and subsequent microbial methanation of coal processing wastes. Applied Biochemistry and Biotechnology. https://doi.org/10.1007/s12010-021-03681-y

Publication dates
Authors	Ahmed, A. and Sharma, Anima
Abstract	Large quantities of rejects from coal processing plants are currently disposed of as waste piles or in ponds and rivers, resulting in environmental concerns including pollution of rivers, and ground and surface water contamination. This work investigates for the first time, a two-stage microbial process for converting coal processing wastes (coal rejects) to methane, involving (1) fungal solubilisation of coal rejects and (2) microbial methanation of the solubilised products. Phanerochaete chrysosporium, Trichoderma viride and Neurospora discreta were screened for their ability to solubilise coal rejects. N. discreta was found to be the most suitable candidate based on the extent of bio-solubilisation, laccase activity and reversed-phase high-performance liquid chromatography (RP-HPLC) analysis. Bio-methanation of fungal-solubilised coal rejects was carried out in mesophilic anaerobic reactors with no additional carbon source, using inoculum from an anaerobic food digester. Coal rejects solubilised by N. discreta produced 3- to 6-fold higher methane compared to rejects solubilised by the other two fungi. No methane was produced from untreated coal rejects, demonstrating the importance of the fungal solubilisation stage. A total of 3.7 mmol of methane was generated per gram of carbon in 15 days from N. discreta-solubilised coal rejects. This process offers a timely, environment-friendly, and sustainable solution for the treatment of coal rejects and the generation of value-added products such as methane and volatile fatty acids. [Abstract copyright: © 2021. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.]
Keywords	Coal bio-methanation; Coal fungal solubilisation; Neurospora discreta; Coal processing waste; Coal rejects
Year	2021
Journal	Applied Biochemistry and Biotechnology
Publisher	Springer
ISSN	1559-0291
Digital Object Identifier (DOI)	https://doi.org/10.1007/s12010-021-03681-y
Official URL	https://link.springer.com/article/10.1007/s12010-021-03681-y#citeas
	http://rdcu.be/cx8pD
Funder	Biotechnology Industry Research Assistance Council Govt of India
Online	20 Sep 2021
Publication process dates
Deposited	22 Sep 2021
Accepted	08 Sep 2021
Accepted author manuscript	Coal biomethanation - accepted version ABAB.pdf License All rights reserved File Access Level Open
Output status	Published

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Accepted author manuscript

	Coal biomethanation - accepted version ABAB.pdf
License: All rights reserved
File access level: Open

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