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Semi-continuous anaerobic co-digestion of marine microalgae with potato processing waste for methane production

Lookup NU author(s): Dr Yanghanzi ZhangORCiD, Dr Gary Caldwell, Dr Paul Sallis

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).

Abstract

The feasibility of using potato processing waste (PPW) as a co-substrate for co-digestion with a marine microalga (Tisochrysis lutea) was evaluated during semi-continuous co-digestion studies, in which the effects of digester start-up strategy (fed, and unfed) and PPW type (potato discarded parts, PPW_dp; potato peel, PPW_p) were examined. Results showed that methane yields were significantly affected by the start-up strategies used, with semi-continuous digesters that were immediate fed with 100% PPW_dp or PPW_p (fed start-up) showing significantly enhanced methane yields (337–374 mL CH₄/g VS) compared to the digesters that were not initially fed either of these substrates (318–328 mL CH₄/g VS). Co-digestion of T. lutea with PPW_dp produced higher methane yields (328–374 mL CH₄/g VS) than co-digestion with PPW_p (318–337 mL CH₄/g VS), but both feedstocks exhibited good potential for co-digestion with T. lutea. In addition, the fed start-up strategy and T. lutea co-digesting with PPW_dp supported a high relative abundance of Methanosarcina. Overall, co-digestion with PPW could be a feasible method to reduce inhibition and enhance methane production when using marine microalgae as a feedstock for biogas production.

Publication metadata

Author(s): Zhang Y, Caldwell GS, Sallis PJ

Publication type: Article

Publication status: Published

Journal: Journal of Environmental Chemical Engineering

Year: 2019

Volume: 7

Issue: 1

Print publication date: 01/02/2019

Online publication date: 23/01/2019

Acceptance date: 19/01/2019

Date deposited: 21/03/2019

ISSN (electronic): 2213-3437

Publisher: Elsevier

URL: https://doi.org/10.1016/j.jece.2019.102917

DOI: 10.1016/j.jece.2019.102917

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