気泡塔による活性スラッジ処理

概要

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The oxygen absorption efficiency and the flow characteristics in a bubble column type aerator were compared with that in a conventional cubic type aerator, and the application of a column type aerator for activated sludge treatment was studied.Three types of aerator were used in this study, i.e., 1- and 6-stage column types (150^φ×3,000mm^H) and a cubic type (700^L×120^W×1,000mm^H), each having a 50l capacity. A 6-stage column aerator was divided into 6 sections with 5 perforated plates (2mm^φ×19 holes). The capacity of oxygen absorption in the 1- and 6-stage bubble columns, as determined by the sulfite method were about five times higher than that of a cubic type aerator with the same air flow rate. The flow characteristics of liquid in column aerators were recorded by a flow-cell type photometer using red ink as a tracer, and the delta response of liquid flow in the 6-stage column aerator indicated a type of piston flow behavior.The continuous activated sludge treatments were carried out using a synthetic waste, containing 750ppm of BOD, in the range of BOD loading : 0.9〜3.6g/l/day at 25℃. The sludge in the 1-stage column and cubic type aerators caused "bulking" with 2.7〜3.6g/l/d of BOD loading, while this trend was not observed in the case of the 6-stage column.
社団法人日本生物工学会の論文
1973-11-25