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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 *** hydraulic retention time(HRT)of the reactors was *** microbial communities of the two AnMBRs were investigated by 16S rRNA gene amplicon sequencing to see the effects of *** predominant Archaea was an aceticlastic methanogen *** 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 *** 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 *** change in the population of hydrogenotrophic methanogens or Anaerolineae can be used as an indicator for process *** sum of the relative abundance of Anaerolineae and Clostridia fluctuated slightly with changes in the HRT in both AnMBRs when the reactor was stably *** 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 *** 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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Niche Differentiation of Phenol-Degrading Microorganisms in UASB Granular Sludge as Revealed by Fluorescence in situ Hybridization

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Engineering 2022年第2期8卷 61-66页

作者： kengo kubota Kei Igarashi Masayoshi Yamada Yasuyuki Takemura Yu-You Li Hideki Harada Department of Civil and Environmental Engineering Tohoku UniversitySendai 980-8579Japan Department of Urban Environmental Design and Engineering National Institute of TechnologyKagoshima CollegeKirishima 899-5193Japan New Industry Creation Hatchery Center Tohoku UniversitySendai 980-8579Japan

A microbial community structure of granules harvested from an anaerobic sludge blanket reactor treating phenolic wastewater was investigated using fluorescence in situ hybridization(FISH)and clone library *** of Syntrophorhabdaceae and Cryptanaerobacter were observed to be responsible for phenol *** accurate taxonomic assignment of Cryptanaerobacter clones,phylogenetic analysis using nearly full-length 16S ribosomal RNA(rRNA)gene sequences was *** oligonucleotide probes were designed to detect the following three taxonomic groups:Syntrophorhabdaceae,Cryptanaerobacter,and *** analysis of thin sections of anaerobic granules showed a random distribution of bacteria and ***,a well-defined distribution of Syntrophorhabdaceae,Cryptanaerobacter,and Syntrophus was *** and Syntrophus were found on the outer layer of the granules and were closely associated with each other,while Syntrophorhabdaceae was located in the deeper part of the *** specific distribution of the bacteria is most likely due to their metabolic association and affinity for the *** degradation in the granular sludge was observed to be carried out in the following ***,Cryptanaerobacter converts phenol to benzoate,which is then degraded by Syntrophus into *** syntrophic degradation of phenol occurs near the surface of the granule,where the phenol concen-tration is *** the deeper part of the granule,where the phenol concentration is lower,Syntrophorhabdaceae degrades phenol into *** observed that Syntrophorhabdaceae is less likely to produce benzoate as an intermediate to feed the neighboring organisms,which contradicts the theo-ries presented by previous studies.

关键词： Cryptanaerobacter Fluorescence in situ hybridization Anaerobic phenol degradation Syntrophorhabdaceae Syntrophus UASB granular sludge

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