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Mini review: Solid-state stratified-bed reactor design for leaf litter digestion

Paliwal, A and Ashritha, J and Chanakya, HN (2021) Mini review: Solid-state stratified-bed reactor design for leaf litter digestion. [Book Chapter]

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Official URL: https://doi.org/10.1201/9781003204435-10


Leafy biomass fed at an organic loading rate of approximately 2 kg TS/m3/d has the potential to produce twice the biogas than what is obtained from the most popular feedstock, cattle dung (1.0 vs. 0.5 m3gas/m3 reactor/d), with a specific gas production between 350–500 L/kg volatile solids reaching theoretical conversion efficiencies between 47 and 67%. This is important, since garden leaf litter and street sweepings with high levels of tree leaf litter form a significant part of the municipal solid waste collected in most cities. However, physical and fermentation characteristics of leafy biomass feedstocks vary significantly and make them a tricky feedstock for digestion, in turn resulting in challenges such as feed preparation, floating within the digesters, scum formation, and difficulty in spent material removal. Solid-state fermenters with better loading rates (˜2 kg TS/L reactor/d), simpler reactor designs, easy operation, and low water requirements offer an easy solution to these problems. In this paper, solid-state fermentation approaches solid-state stratified-bed reactors for anaerobic digestion of leafy biomass. Challenges in the digestion of the lignocellulosic biomass (leafy biomass), basis of the solid-state reactor design, and operation are presented. The chapter also explains the single-stage solid-state reactors from the standpoint of underlying processes and the challenges they overcome during digestion of leafy biomass. Solid-state reactor builds upon the principles of landfill while aligning with several fermentation properties of the leafy biomass. Solid-state reactors with biogas production rates (L biogas/L reactor/d) comparable to popular dung digester design (0.3–0.6 L/L/d) provides an alternative decentralised treatment of municipal solid waste litter fractions.

Item Type: Book Chapter
Publication: Biomethane through Resource Circularity: Research, Technology and Practices
Publisher: CRC Press
Additional Information: The copyright for this article belongs to CRC Press
Department/Centre: Division of Mechanical Sciences > Centre for Sustainable Technologies (formerly ASTRA)
Date Deposited: 23 May 2022 06:09
Last Modified: 23 May 2022 06:09
URI: https://eprints.iisc.ac.in/id/eprint/71880

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