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Bacterial communities in different locations, seasons and segments of a dairy wastewater treatment system consisting of six segments

查看全文 作　　者：Kikue [1]Hirota;Yuji [1]Yokota;Toru [2]Sekimura;Hiroshi [2]Uchiumi;Yong [3]Guo;Hiroyuki [3]Ohta;Isao [1,4]Yumoto 高影响力作者 机构地区：[1]Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST);[2]ACT Corporation;[3]Ibaraki University College of Agriculture;[4]Laboratory of Environmental Microbiology, Graduate School of Agriculture, Hokkaido University高影响力机构 出　　处：《Journal of Environmental Sciences》索引2016年第28卷第8期,共7页高影响力期刊 基　　金：supported by a grant for the promotion of desterilizing regional resources funded by the Hokkaido Bureau of Economy,Trade and Industry 摘　　要：A dairy wastewater treatment system composed of the 1st segment(no aeration) equipped with a facility for the destruction of milk fat particles, four successive aerobic treatment segments with activated sludge and a final sludge settlement segment was developed. The activated sludge is circulated through the six segments by settling sediments(activated sludge) in the 6th segment and sending the sediments beck to the 1st and 2nd segments.Microbiota was examined using samples from the non-aerated 1st and aerated 2nd segments obtained from two farms using the same system in summer or winter. Principal component analysis showed that the change in microbiota from the 1st to 2nd segments concomitant with effective wastewater treatment is affected by the concentrations of activated sludge and organic matter(biological oxygen demand [BOD]), and dissolved oxygen(DO) content. Microbiota from five segments(1st and four successive aerobic segments) in one location was also examined. Although the activated sludge is circulating throughout all the segments, microbiota fluctuation was observed. The observed successive changes in microbiota reflected the changes in the concentrations of organic matter and other physicochemical conditions(such as DO), suggesting that the microbiota is flexibly changeable depending on the environmental condition in the segments. The genera Dechloromonas, Zoogloea and Leptothrix are frequently observed in this wastewater treatment system throughout the analyses of microbiota in this study. 关 键 词：Dairy wastewater Dairy fat Activated sludge Bacterial community analysis
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