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Article

Impact of Organic Loading Rate on Performance and Methanogenic Microbial Communities of a Fixed-Bed Anaerobic Reactor at 4 °C

1
College of Agronomy, Yanbian University, Yanji 133002, China
2
College of Agronomy and Biotechnology, Center of Biomass Engineering, China Agricultural University, Beijing 100193, China
3
School of Life Science and Technology, Heilongjiang August First Land Reclamation University, Daqing 163000, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(9), 2586; https://doi.org/10.3390/w12092586
Received: 26 June 2020 / Revised: 4 September 2020 / Accepted: 7 September 2020 / Published: 16 September 2020
(This article belongs to the Special Issue Enhancement of Anaerobic Digestion for Energy and Resource Recovery)
We investigated the feasibility of producing biogas in a fixed-bed anaerobic reactor at 4 °C with a gradual increase in organic loading rate (OLR). Reactor efficiency was highest when OLR was 4.33 kg/m3·d, whereas the reactor acidification occurred when OLR was 4.67 kg/m3·d. The values of methane content, biogas production, chemical oxygen demand (COD) removal rate, biogas production rate, acetic acid content, and propionic acid content were 69.3%, 5.33 L, 59.8%, 1.03 L/OLR, 0.17 g/L, and 1.15 g/L, respectively. The pH was stable and ranged from 7.2 to 6.8 when the reactor was operating at 4 °C during OLR increase. The 16S rRNA gene analysis revealed that the dominant archaea were Methanosaetaceae at 30 °C. At 4 °C, the dominant archaea were Methanomicrobiales, which were more abundant in adhering sludge compared to settled sludge. In conclusion, operating a fixed-bed anaerobic reactor at psychrophilic temperatures is more suitable. View Full-Text
Keywords: fixed-bed reactor; organic loading rate; low temperature; anaerobic reactor; methanogens fixed-bed reactor; organic loading rate; low temperature; anaerobic reactor; methanogens
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MDPI and ACS Style

Zhao, H.; Yan, F.; Li, X.; Piao, R.; Wang, W.; Cui, Z. Impact of Organic Loading Rate on Performance and Methanogenic Microbial Communities of a Fixed-Bed Anaerobic Reactor at 4 °C. Water 2020, 12, 2586. https://doi.org/10.3390/w12092586

AMA Style

Zhao H, Yan F, Li X, Piao R, Wang W, Cui Z. Impact of Organic Loading Rate on Performance and Methanogenic Microbial Communities of a Fixed-Bed Anaerobic Reactor at 4 °C. Water. 2020; 12(9):2586. https://doi.org/10.3390/w12092586

Chicago/Turabian Style

Zhao, Hongyan; Yan, Feifan; Li, Xue; Piao, Renzhe; Wang, Weidong; Cui, Zongjun. 2020. "Impact of Organic Loading Rate on Performance and Methanogenic Microbial Communities of a Fixed-Bed Anaerobic Reactor at 4 °C" Water 12, no. 9: 2586. https://doi.org/10.3390/w12092586

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