Lookup NU author(s): Yanghanzi Zhang,
Dr Gary Caldwell,
Dr Andrew Zealand,
Dr Paul Sallis
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).
This investigation aimed to evaluate the feasibility of potato processing waste (PPW) as a co-substrate for Chlorella vulgaris in batch biochemical methane potential (BMP) tests. Three parameters were examined: C. vulgaris and PPW mixing ratios (100:0, 75:25, 50:50, 25:75 and 0:100), PPW type (potato discarded parts (PPWdp) and potato peel (PPWp)), and substrate to inoculum ratio (0.5 and 1.0 SIRs). The mixing ratio was a significant factor with higher methane yields obtained with 25:75 C. vulgaris: PPW. The type of PPW also affected methane yield, as C. vulgaris co-digested with PPWdp increased methane yield by 22–47%, versus a 12–32% enhancement with PPWp. Moreover, a SIR of 1.0 led to an accumulation of soluble COD, resulting in decreased methane yield relative to a SIR of 0.5. Overall, the current study showed that PPW are suitable feedstocks for co-digestion with microalgae, with the enhanced methane yields attributed to a balance C/N ratio. However, the extra nitrogen in the seed inoculum of the BMP test may have obscured the full benefits and hidden some synergistic effects. Therefore, the follow-up studies should be carried out in continuous anaerobic digesters to verify the full potential of PPW as co-digestion substrate for microalgae.
Author(s): Zhang Y, Caldwell GS, Zealand AM, Sallis PJ
Publication type: Article
Publication status: Published
Journal: Biochemical Engineering Journal
Print publication date: 31/12/2018
Online publication date: 26/12/2018
Acceptance date: 25/12/2018
Date deposited: 03/01/2019
ISSN (print): 1369-703X
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