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Co-digestion of spent mushroom substrate and corn stover for methane production via solid-state anaerobic digestion
Performance of batch solid-state anaerobic co-digestion of spent mushroom substrates (SMS) and corn stover (CS) was investigated. Digestion with SMS alone (SMS/CS = 100:0) resulted in excessive volatile fatty acids (VFAs) accumulation and low methane yields during the start-up phase. Co-digestion of SMS and CS significantly enhanced digesting performance. Compared to the digesters with 100% SMS, the start-up phase of the digesters with SMS/CS = 75:25 was shortened from 11 days to 4 days, and the methane yield increased by 40%. It was also observed that the peak of daily biogas yields showed up earlier in the co-digestion reactors than in the digesters with SMS alone. A similar phenomenon happened to the methane content curves. The VFAs and pH were shown to be important driving factors for determining the population of methanogenic communities (methanosaeta and methanobacteriaceae), which were obtained by using the Fluorescent in situ Hybridization method. The changes of the methanogenic communities, in return, affected the methane production in digesters. This study showed that co-digesting SMS with CS is a feasible method to handle mushroom wastes and produce bioenergy.
Co-digestion of spent mushroom substrate and corn stover for methane production via solid-state anaerobic digestion
Performance of batch solid-state anaerobic co-digestion of spent mushroom substrates (SMS) and corn stover (CS) was investigated. Digestion with SMS alone (SMS/CS = 100:0) resulted in excessive volatile fatty acids (VFAs) accumulation and low methane yields during the start-up phase. Co-digestion of SMS and CS significantly enhanced digesting performance. Compared to the digesters with 100% SMS, the start-up phase of the digesters with SMS/CS = 75:25 was shortened from 11 days to 4 days, and the methane yield increased by 40%. It was also observed that the peak of daily biogas yields showed up earlier in the co-digestion reactors than in the digesters with SMS alone. A similar phenomenon happened to the methane content curves. The VFAs and pH were shown to be important driving factors for determining the population of methanogenic communities (methanosaeta and methanobacteriaceae), which were obtained by using the Fluorescent in situ Hybridization method. The changes of the methanogenic communities, in return, affected the methane production in digesters. This study showed that co-digesting SMS with CS is a feasible method to handle mushroom wastes and produce bioenergy.
Co-digestion of spent mushroom substrate and corn stover for methane production via solid-state anaerobic digestion
Zhu, Jiying (author) / Han, Menglong (author) / Zhang, Guokang (author) / Yang, Liangcheng (author)
2015-03-01
10 pages
Article (Journal)
Electronic Resource
English
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