Experimental Study on Growth and Control of Filamentous Organisms in Activated Sludge Process : Part 1-Growth Factors of Filamentous Organisms in Several Types of the Modified Processes

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  • NOCHI Keiko
    Faculty of Engineering, Kanto Gakuin University
  • MUTO Nobuo
    Faculty of Engineering, Kanto Gakuin University
  • KANAZU Fumio
    Engineering Research Institute, Penta-Ocean Construction Co., Ltd

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Other Title
  • 活性汚泥法における糸状微生物の発生と抑制に関する研究 : 第1報-幾つかの排水処理方式からみた糸状微生物の発生要因
  • 活性汚泥法における糸状微生物の発生と抑制に関する研究-1-幾つかの排水処理方式からみた糸状微生物の発生要因
  • カッセイ オデイホウ ニ オケル イトジョウ ビセイブツ ノ ハッセイ ト ヨク

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Excessive growth of filamentous organisms has been reported that it was a cause of sludge bulking in activated sludge system for wastewater treatment and had various living factors in many sides of biological engineering fields and operating fields. In this laboratory scale study, each substrate composition in two kinds of synthetic wastewater was settled, and the ways of water feed into the aeration tanks were practiced in order to find growth and control factors of filamentous organisms. The following aspects could be obtained from the experiment. 1) The SV values (y, ml) and MLSS values (x, g) were observed with time in various modified activated sludge processes. Rearranging these results, the relation was obtained as y=ax+b, a value means average SVI value in each experimental period in about ten days. It was apparent that a value was highest (max, 755ml/g) in the extended aeration process with continuous feed of No. 1 synthetic nutrient water. 2) SVI values showed the tendency to be higher in under 0.06 of F/M value (food to microorganism ratio). 3) The multiple regression analysis was practiced between F/M value and the time to bulking occurrence in various substrates feeding methods to each aeration tank.

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