EXPERIMENTAL STUDY ON SELF-PURIFICATION OF NITROGEN BY ATACHED ALGAE IN A TIDAL AREA

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  • MAKINOSE Hajime
    社団法人 土木学会 日本大学大学院工学研究科
  • TAKAHASHI Yukihiko
    社団法人 土木学会 哈爾濱工業大学市政環境工程学院 財団法人 建設工学研究振興会
  • NAKAMURA Michimasa
    社団法人 土木学会 日本大学 工学部土木工学科

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  • 感潮域における付着性藻類を中心とした窒素系自浄作用に関する実験的研究
  • カン チョウイキ ニ オケル フチャクセイ ソウルイ オ チュウシン ト シタ チッソケイジジョウサヨウ ニ カンスル ジッケンテキ ケンキュウ

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Abstract

The effects of salt concentration and dilution rates on self-purification of nitrogen were experimentally investigated by continuous stirred tank reactor. Setup conditions were the salt concentration of 0%, 25%, 50%, 75%, 100%, and HRT 4, 8, 16, 24, 48hr, it cleared a degree of participation under the coexistence of microorganisms such as algae and nitrification bacteria. Under the salinity concentration; 1) Poor conditions when the dilution rate is low, assimilation of nitrogen by the algae was predominant. When the dilution rate is high, the nitrification by nitrifying bacteria is predominant. 2) Rich conditions when the dilution rate is low, assimilation of nitrogen by the algae was predominant. When the dilution rate is high, the nitrification by nitrifying bacteria is predominant. The response of nitrite oxidizing bacteria the was high to the salt concentration, and nitrite nitrogen accumulated it.

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