Effect of cow dung on anaerobic digestion characteristics of poplar fuel ethanol wastewater

Deng, Pingping; Yan, Xiaofan; Liu, Ruixia; Ding, Tingting; Chen, Jienan; Wu, Zhongbiao

doi:10.1007/s13399-022-02549-3

Cited by 6 publications

(2 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Biogas production was low and VFAs accumulated in 2–6 days, which caused pH decreasing, and pH increased along with gas production increased. The pH range (7.00–8.50) provided a suitable living environment for methanogens …”

Section: Resultsmentioning

confidence: 99%

“…The pH range (7.00− 8.50) provided a suitable living environment for methanogens. 35 The variety of SCOD concentrations reflects the efficiency of hydrolysis and acidification during AD. The fermentation temperature of AD can significantly affect the efficiency of enzyme activity and hydrolysis rate.…”

Section: Effect Of Temperature On Fermentation Characteristics Of Ad ...mentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2023

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Effect Of Temperature On Fermentation Characteristics Of Ad ...mentioning

confidence: 99%