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Lookup NU author(s): Dr Yanghanzi Zhang,
Dr Gary Caldwell,
Dr Paul Sallis
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).
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, PPWdp; potato peel, PPWp) 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% PPWdp or PPWp (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 PPWdp produced higher methane yields (328–374 mL CH4/g VS) than co-digestion with PPWp (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 PPWdp 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.
Author(s): Zhang Y, Caldwell GS, Sallis PJ
Publication type: Article
Publication status: Published
Journal: Journal of Environmental Chemical Engineering
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
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