Influence of Rural Sewage Effluent on Riverine Water Quality and Microflora

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  • FUJII Takatoshi
    Department of Materials Science, National Institute of Technology, Yonago College
  • TAKATSUKA Fumiya
    Department of Materials Science, National Institute of Technology, Yonago College
  • DATE Yusuke
    Department of Materials Science, National Institute of Technology, Yonago College
  • NAKANO Yoichi
    Department of Chemical and Biological Engineering, National Institute of Technology, Ube College
  • AOKI Kaoru
    Department of Materials Science, National Institute of Technology, Yonago College
  • SUZAKI Moemi
    Department of Materials Science, National Institute of Technology, Yonago College
  • HINO Eiichi
    Department of Materials Science, National Institute of Technology, Yonago College
  • FUJII Yuzo
    Department of Materials Science, National Institute of Technology, Yonago College
  • OKUDA Tetsuji
    Faculty of Science and Technology, Ryukoku University,
  • NISHIJIMA Wataru
    Environmental Research and Management Center, Hiroshima University
  • FUJIE Koichi
    Institute of Advanced Sciences, Yokohama National University

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Other Title
  • 農業集落排水処理水が放流先河川水質および微生物叢に及ぼす影響評価
  • ノウギョウ シュウラク ハイスイ ショリスイ ガ ホウリュウサキ カセン スイシツ オヨビ ビセイブツソウ ニ オヨボス エイキョウ ヒョウカ

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In this study, the impact of rural sewage effluent on the water quality of an agricultural water channel and rural river was investigated. Treated water samples from rural sewage, an agricultural water channel, and a rural river were analyzed. In addition, microflora analyses were conducted on the sediments and water samples from each location using the quinone profile methodology. The results revealed the critical need to study the impacts of treated sewage effluents on freshwater ecosystems. The nitrogen and phosphorus concentrations of water in the agricultural water channel increased downstream of the treated wastewater (TW) inflow. The annual average nitrogen and phosphorus concentrations in the TW were 7.33 mg L-1 and 1.83 mg L-1 higher, respectively, than those measured in the agricultural water channel upstream of the reclaimed wastewater inflow. Furthermore, a slight increase in the sediment microbial biomass, determined by the loss-on-ignition method, was observed in the treated water flowing into the agricultural water channel. It was clarified that rural sewage effluents with a high concentration of nutrients affect the microflora in the agricultural water channel, and, in particular, contribute to the increase in the amount of denitrifying bacteria.

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