Study on anaerobic co-digestion of municipal sewage sludge and fruit and vegetable wastes: Methane production, microbial community and three-dimension fluorescence excitation-emission matrix analysis

• Published in: Bioresource technology 2022-03, Vol.347, p.126748-126748, Article 126748
• Main Authors: Jiang, Xinru, Xie, Yandong, Liu, Minggang, Bin, Shiyu, Liu, Yang, Huan, Chenchen, Ji, Gaosheng, Wang, Xinhui, Yan, Zhiying, Lyu, Qingyang
• Format: Article
• Language: English
• Subjects: Anaerobiosis; Biofuels - analysis; Bioreactors; Digestion; Fluorescence; Fruit - chemistry; Fruit and vegetable waste; Humans; Humification; Methane - analysis; Methane production; Microbiota; Sewage; Sewage sludge; Synergetic anaerobic digestion; Vegetables
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2022.126748

[Display omitted] •Co-digestion improved double CH4 production than sewage sludge mono-digestion.•Co-digestion exhibited controllable and tiny impairment to system stability. Co-digestion showed lower total ammonia nitrogen accumulation.•Stronger acetotrophic methanogenesis was established in co-digester.•Co-digestion showed lower humification and aromaticity for digestate. Constantly increased sewage sludge (SS) and fruit and vegetable wastes (FVW) are becoming the major organic solid wastes in human society. Thus, anaerobic digestion is employed as a low carbon energy strategy to reduce their environmental pollution risk. Anaerobic co-digestion system was developed based on the carbon to nitrogen ratio strategy. Results showed that the daily biogas production was higher in co-digester, and the volumetric biogas production rate (VBPR) significantly enhanced for 1.3 ∼ 3 folds, and the highest VBPR was 2.04 L/L • day with optimal OLR of 2.083 Kg L-1 d-1. Analytic results indicated that co-digestion could improve the biodegradable of feedstocks, which transforming to more VFAs and biogas. Compared with mono SS digester, mixed substrates relieved ammonia nitrogen inhibition and enhanced the hydrolytic acidification and methanogenesis. Meanwhile, the excessive humification of organics was suppressed. This study supported the concepts of improving carbon recovery from SS and FVW.