Review on solid-state anaerobic digestion of lignocellulosic biomass and organic solid waste

Khuntia, HK and Paliwal, A and Kumar, DR and Chanakya, HN (2022) Review on solid-state anaerobic digestion of lignocellulosic biomass and organic solid waste. In: Environmental Monitoring and Assessment, 194 (7).

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Abstract

Sustainable management of organic solid wastes especially the municipal solid waste (MSW) is essential for the realization of various sustainable development goals (SDGs). Resource recovery centric waste processing technologies generate valorizable products to meet the operations and maintenance (O&M) costs while reducing the GHG emissions. Solid-state anaerobic digestion (SSAD) of organic solid wastes is a biomethanation process performed at a relatively higher total solids (TS) loading in the range of 10–45%. SSAD overcomes various limitations posed by conventional anaerobic slurry digesters such as higher degradable matter per unit volume of the bioreactor resulting in a smaller footprint, low freshwater consumption, low wastewater generation, simple upstream and downstream processes, relatively lower operation, and maintenance costs. This review elucidates the recent developments and critical assessment of different aspects of SSAD, such as bioreactor design, operational strategy, process performances, mass balance, microbial ecology, applications, and mathematical models. A critical assessment revealed that the operating scale of SSAD varies between 1000 and 100,000 ts/year at organic loading rate (OLR) of 2–15 g volatile solids (VS)/L·day. The SSAD experiences process failures due to the formation of volatile fatty acids (VFAs), biogas pockets and clogging of the digestate outlet. Acclimatization of microbes accelerates the startup phase, steady-state performances, and the enrichment of syntrophic microbes with 10–50 times greater population of cellulolytic and xylanolytic microbes in thermophilic SSAD over mesophilic SSAD. Experimental limitations in the accurate determination of rate constants and the oversimplification of biochemical reactions result in an inaccurate prediction by the models.

Item Type:	Journal Article
Publication:	Environmental Monitoring and Assessment
Publisher:	Springer Science and Business Media Deutschland GmbH
Additional Information:	The copyright for this article belongs to the Springer Science and Business Media Deutschland GmbH.
Keywords:	biofuel; lignin; lignocellulose; methane, anaerobic growth; biomass; bioreactor; environmental monitoring; procedures; solid waste; waste disposal, Anaerobiosis; Biofuels; Biomass; Bioreactors; Environmental Monitoring; Lignin; Methane; Refuse Disposal; Solid Waste
Department/Centre:	Division of Mechanical Sciences > Centre for Sustainable Technologies (formerly ASTRA)
Date Deposited:	04 Jul 2022 06:00
Last Modified:	04 Jul 2022 06:00
URI:	https://eprints.iisc.ac.in/id/eprint/74122

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