Anaerobic co-digestion of cabbage waste and cattle manure: Effect of mixing ratio and hydraulic retention time

Xinhui Yu, Lei Yan, Haipeng Wang, Shaojie Bi, Futao Zhang, Sisi Huang, Yanhong Wang and Yanjie Wang

Renewable Energy, 2024, vol. 221, issue C

Abstract: The aim of this study is to optimize the process parameters for the anaerobic co-digestion of cabbage waste and cattle manure, with the objective of maximizing methane production. Batch experiments were conducted using five different mixing ratios (1:0, 3:1, 1:1, 1:3, and 0:1), and continuous experiments were run at six different hydraulic retention times (HRTs) of 25, 20, 15, 10, 8, and 5 days. The results indicate that the co-digestion displayed a synergistic effect, as evidenced by a cooperative index greater than 1. Additionally, an appropriate cabbage waste to cattle manure ratio of 3:1 yielded a maximum methane production of 440 mL/g-VS. During the continuous study, the highest methane production rate of 1.55 L/(L·d) was achieved at 10-day HRT. Efficient methane yields in the range of 322–336 mL/g-VS were obtained at HRTs of 25, 20, and 15 days. Methane yield decreased when HRTs were shortened to 10 or 8 days due to the accumulation of volatile fatty acids and the loss of methanogens. At an HRT of 4 days, methane production nearly ceased. These results provide insights for the optimization of anaerobic co-digestion of cabbage waste and cattle manure, leading to higher methane production.

Keywords: Biogas; Cabbage waste; Gompertz model; Mixing ratio; Hydraulic retention time; Model analysis (search for similar items in EconPapers)
Date: 2024
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:221:y:2024:i:c:s0960148123016580

DOI: 10.1016/j.renene.2023.119743

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