Biochemical Process and Microbial Evolution in the Conversion of Corn Straw Combined with Coal to Biogas

Zhang, Wei; Wang, Zebin; Guo, Hongyu; Li, Libo; Zhang, Minglu; Zhang, Wen; Sun, Xiaoli; Sun, Shixuan; Kou, Congliang; Zhao, Weizhong

doi:10.1021/acsomega.2c03331

Cited by 1 publication

(1 citation statement)

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“…Therefore, many studies have demonstrated that temperature has an effect on the community composition of microorganisms during anaerobic fermentation, but the metabolic pathways of methanogenesis are different under different operating conditions and raw materials. Most of the research works have focused on the exploration of the effect of fermentation temperature on the larger VS of substances such as kitchen waste, 19 pig manure, 13 straw, 14,20,21 sewage sludge, 22,23 and so forth, and few studies have reported the effect of temperature on the fermentation properties and microbial community when low VS of wastewater such as poplar ethanol wastewater was treated by AD. The objective of this study was to compare the fermentation performance of poplar ethanol wastewater (smaller VS compared to other substrates) at different temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature on Anaerobic Fermentation of Poplar Ethanol Wastewater: Performance and Microbial Communities

et al. 2023

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Temperature plays an important role in anaerobic digestion (AD), and different substrates have different optimum temperatures in AD. However, the effect of temperature on the performance of AD when cellulosic ethanol wastewater was used as a substrate was rarely reported. Therefore, the digestion characteristics of cellulosic ethanol wastewater at 25, 35, 45, and 55 °C were investigated, and the microbial communities of the sludge sample were analyzed after fermentation. The results showed that the cumulative methane production was the highest at 55 °C, 906.40 ± 50.67 mL/g VS, which was 81.06, 72.42, and 13.33% higher than that at 25, 35, and 45 °C, respectively. The content of methane was 68.13, 49.26, 70.46, and 85.84% at the terminal period of fermentation at temperatures of 25, 35, 45, and 55 °C, respectively. The testing of volatile fatty acids (VFAs) indicated that the accumulation of VFAs did not occur when the fermentation was carried out at 25, 35, and 45 °C; however, the VFA content at 55 °C was much larger than that in the three groups (25, 35, and 45 °C), and the ratio of propionic acid to acetic acid was larger than 1.4 at the late stage of fermentation, so it inhibited the fermentation. The diversity of the microbial community indicated that the floral structure and metabolic pathway of fermentation were alike at 25 and 35 °C. Firmicutes and Proteobacteria were the main flora covering the 25–55 °C-based phylum or below it. The relative abundance of Methanosaeta was the highest when fermentation temperatures were 25 and 35 °C; however, its relative abundance decreased sharply and the relative abundance of Methanosarcina increased substantially when the temperature increased from 35 to 45 °C, which indicated that Methanosarcina can exist in higher temperatures. At the same time, hydrogenotrophic methanogens such as Methanoculleus and Methanothermobacter were dominant when fermentation temperatures were 45 and 55 °C, which indicated that the metabolic pathway changed from acetoclastic methanogenesis to hydrogenotrophic methanogenesis.

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