Insights into the ambient temperature startup of an anaerobic ceramic membrane bioreactor with thermally hydrolyzed inoculum for domestic wastewater treatment

Case Studies in Chemical and Environmental Engineering

Junya Zhang¹  Dawei Yu²  Amila Abeynayaka³  Rathmalgodage Thejani Nilusha⁴  Yuansong Wei⁴ 

[1] Department of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China;Environment Technology Section, Industrial Technology Institute, 363 Bauddhaloka Mawatha, Colombo 07, 00700, Sri Lanka;University of Chinese Academy of Sciences, Beijing, 100049, China;State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China;

关键词: Anaerobic;    Ceramic membrane;    Startup;    Domestic wastewater;    Microbial community;    Membrane bioreactor;   

DOI  :  

来源: DOAJ

【 摘 要 】

An anaerobic ceramic membrane bioreactor (AnCMBR) with thermally-hydrolyzed sewage sludge as the inoculum was started up at the ambient temperature (26.97 ± 4.23 °C) for treating simulated domestic wastewater. The AnCMBR was operated for 60 days under 24 h hydraulic retention time (HRT), 50 days sludge retention time (SRT), and the mean organic loading rate (OLR) of 0.42 kgCODm−3d−1. Soluble chemical oxygen demand (SCOD) removal evaluation, volatile fatty acid (VFA), and Alkalinity (ALK) analyses, and the microbial community evaluation by polymerase chain reaction (PCR) were conducted. The reported maximum and mean SCOD removals were 62%, 43.54% ± 11.61 respectively. The total volatile fatty acids/alkalinity (TVFA/ALK) ratio was 0.59 indicating system instability. Microbial community analysis revealed significant shifts during the start-up process. The Bacteroidetes were well acclimatized throughout the start-up. The Firmicutes had suppressed during the start-up while Proteobacteria, Epsilonbacteraeota, Spirochetes phylum newly emerged in the system. The thermally-hydrolyzed inoculum was not established as a successful microbial community for treating domestic wastewater at the ambient conditions in this AnCMBR. The findings provided insights on microbial mechanisms and the basis of anaerobic digestion process instability. In comparison with previous studies, the potential countermeasures to address this were identified as proper selection and frequent addition of inoculum, and process monitoring.

【 授权许可】

Unknown