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Microbial characteristics in anaerobic membrane bioreactor treating domestic sewage:Effects of HRT and process performance

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Journal of Environmental Sciences 2022年第1期34卷 392-399页

作者： Jialing Ni Jiayuan Ji Yu-You Li Kengo Kubota Department of Civil and Environmental Engineering Graduate School of EngineeringTohoku University6-6-06 AobaAramakiAoba-ku 980-8579SendaiJapan Department of Frontier Science for Advanced Environment Graduate School of Environmental StudiesTohoku University6-6-06 AobaAramakiAoba-ku 980-8579SendaiJapan

Two anaerobic membrane bioreactors(AnMBRs)equipped with different membrane pore size(0.4 or 0.05μm)were operated at 25℃and fed with domestic wastewater.The hydraulic retention time(HRT)of the reactors was shortened.The microbial communities of the two AnMBRs were investigated by 16S rRNA gene amplicon sequencing to see the effects of HRT.The predominant Archaea was an aceticlastic methanogen Methanosaeta.The composition of hydrogenotrophic methanogens changed with the HRTs:the population of Methanobacterium was higher for longer HRTs,whereas the population of unclassified Methanoregulaceae was higher for shorter HRTs.The Anaerolineae,Bacteroidia and Clostridia bacteria were dominant in both of the reactors,with a combined relative abundance of over 55%.The relative abundance of Anaerolineae was proportional to the biogas production performance.The change in the population of hydrogenotrophic methanogens or Anaerolineae can be used as an indicator for process monitoring.The sum of the relative abundance of Anaerolineae and Clostridia fluctuated slightly with changes in the HRT in both AnMBRs when the reactor was stably operated.The co-occurrence analysis revealed the relative abundance of the operational taxonomic units belonging to Anaerolineae and Clostridia was functionally equivalent during the treatment of real domestic sewage.A principal coordination analysis revealed that the changes in the microbial community in each reactor were consistent with the change of HRT.In addition,both the HRT and the stability of the process are important factors for maintaining microbial community structures.

关键词： anaerobic membrane bioreactor Co-occurrence analysis Hydrogenotrophic methanogen HRT Microbial community structure Principal coordinate analysis

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Methanation and chemolitrophic nitrogen removal by an anaerobic membrane bioreactor coupled partial nitrification and Anammox

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Frontiers of Environmental Science & Engineering 2023年第6期17卷 37-47页

作者： Qian Li Zhaoyang Hou Xingyuan Huang Shuming Yang Jinfan Zhang Jingwei Fu Yu-You Li Rong Chen Key Laboratory of Environmental Engineering of Shaanxi Province Xi'an University of Architecture and TechnologyXi'an 710055China Department of Civil and Environmental Engineering Graduate School of EngineeringTohoku UniversitySendai Miyagi 980-8579Japan International S&T Cooperation Center for Urban Alternative Water Resources Development Key Laboratory of Northwest Water ResourceEnvironment and Ecology(Ministry of Education)Xi'an University of Architecture and TechnologyXi'an 710055China

An AnMBR-PN/A system was developed for mainstream sewage treatment.To verify the efficient methanation and subsequent chemolitrophic nitrogen removal,a long-term experiment and analysis of microbial activity were carried out.AnMBR performance was less affected by the change of hydraulic retention time(HRT),which could provide a stable influent for subsequent PN/A units.The COD removal efficiency of AnMBR was>93%during the experiment,85.5%of COD could be recovered in form of CH4.With the HRT of PN/A being shortened from 10 to 6 h,nitrogen removal efficiency(NRE)of PN/A increased from 60.5%to 80.4%,but decreased to 68.8%when the HRTPN/A further decreased to 4 h.Microbial analysis revealed that the highest specific ammonia oxidation activity(SAOA)and the ratio of SAOA to specific nitrate oxidation activity(SNOA)provide stable NO_(2)^(−)-N/NH_(4)^(+)-N for anammox,and anammox bacteria(mainly identified as Candidatus Brocadia)enriched at the bottom of Anammox-UASB might play an important role in nitrogen removal.In addition,the decrease of COD in Anammox-UASB indicated partial denitrification occurred,which jointly promoted nitrogen removal with anammox.

关键词： anaerobic membrane bioreactor Partial nitrification/Anammox Carbon separation Chemolitrophic nitrogen removal

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membrane fouling control by ultrasound in an anaerobic membrane bioreactor

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Frontiers of Environmental Science & Engineering 2007年第3期1卷 362-367页

作者： SUI Pengzhe WEN Xianghua HUANG Xia State Key Laboratory of Environment Simulation and Pollution Control Department of Environmental Science and EngineeringTsinghua UniversityBeijing 100084China

fouling online in an anaerobic membrane bioreac-tor(AMBR).Short-term running experiments were carried out under different operating conditions to explore feasible ultrasonic parameters.The experimental results indicated that when the crossflow velocity was more than 1.0 m/s,mem-brane fouling could be controlled effectively only by hydro-dynamic methods without ultrasound.When ultrasound was applied,an ultrasonic power range of 60-150 W was suitable for the membrane fouling control in the experimental system.The experimental results showed that the membrane fouling was controlled so well that membrane filtration resistance(ΣR)could stay at 5×10^(11)m^(−1) for more than a week with the crossflow velocity of 0.75 m/s,which equaled the effect of crossflow velocity of more than 1.0 m/s without ultrasound.

关键词： anaerobic membrane bioreactor membrane fouling control ultrasound

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