Influence of mixing proportion on the solid-state anaerobic co-digestion of distiller's grains and food waste

Li Hong Wang, Qunhui Wang*, Weiwei Cai, Xiaohong Sun

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)

Abstract

The solid-state anaerobic co-digestion (AC) of distiller's grains (DG) and food waste (FW) for biogas production was investigated. The effects of different DG/FW (TS) ratios (10/1, 8/1, 6/1, 4/1, 1/0, and 0/1) were examined. Co-digestion with the above DG/FW ratios was found to be superior to that of mono-digestion. The AC of DG and FW had a good synergistic effect of the lower range of propionate/acetate ratio and VFA/alkalinity ratio. No methane was produced when the propionate/acetate ratio was >0.1 ± 0.01, but this inhibition was reversible. When the propionate/acetate ratio was <0.08 ± 0.01, methane production began to recover. When the volatile fatty acids (VFA)/alkalinity ratios were <0.9 ± 0.05, the AC of the influents successfully proceeded in a stable manner. However, when the VFA/alkalinity and propionate/acetate ratios were >1.25 ± 0.21 and 0.1 ± 0.01, respectively, the AC system reached an acidification crisis and failed. Therefore, the propionate/acetate and VFA/alkalinity ratios may be used as important indices for controlling anaerobic digestion (AD).

Original languageEnglish
Pages (from-to)130-137
Number of pages8
JournalBiosystems Engineering
Volume112
Issue number2
DOIs
Publication statusPublished - Jun 2012
Externally publishedYes

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Wang, L. H., Wang, Q., Cai, W., & Sun, X. (2012). Influence of mixing proportion on the solid-state anaerobic co-digestion of distiller's grains and food waste. Biosystems Engineering, 112(2), 130-137. https://doi.org/10.1016/j.biosystemseng.2012.03.006