Experimental Study on Growth and Control of Filamentous Organisms in Activated Sludge Process : Part 3-Control of Filamentous Bulking by the Intermittent Inflow Process

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  • 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3報-間欠流入方式を用いた糸状性バルキングの抑制
  • カッセイ オデイホウ ニ オケル シジョウ ビセイブツ ノ ハッセイ ト ヨク

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It was guessed by our previous experiences that the growth of filamentous organisms was caused and effected by BOD loading at biological reactor inlet and inflow intervals. This study was mainly practiced to find optimum initial BOD loading and intervals of intermittent inflow to the reactor. This paper described on the following items. 1) The synthetic nutrients water was used as the wastewater which was suitable for growth of filamentous organisms. 2) The inflow methods of wastewater to the reactors were applied continuous inflow, intermittent inflow and batch one. As a result, the filamentous bulking was suppressed both in the batch inflow with one time per day and the intermittent inflow with 3 to 5 times per day, while the bulking was apparent in the continuous inflow. 3) In each process, SVI values of activated sludge were effected by inflow interval and BOD-MLSS loading [BOD-g/MLSS-g・time]. As a result of multiple regression analysis, filamentous bulking could be controlled ranging from 0.1 to 10 [BOD-g/MLSS-g・time] of BOD-MLSS loading with above 5 hours of inflow interval.

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