下水処理における散気式回流曝気槽の曝気性能に関する研究

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The Authors studied on the aeration performance, i.e. the surface velocities and oxygen transfer of the spiral flow aeration tank, from the viewpoint of the maintenance and management of the aeration tank in the sewage treatment plant. The following results were obtained. 1. In the spiral flow aeration tank, the circulating velocity of tank liquor was related to the air flow rate and the plate depth, and was induced by the rising of bubles. The deeper the water depth of the diffuser plate, the greater was the rising velocity of bubbles.2. The surface velocity or circulating velocity in the spiral flow aeration tank was an exponential function of the air flow rate, and was expressed as follows : υ=m(Gs/V)^n υ : surface velocity or circulating velocity, cm/sec GS : air flow rate, l/min m, n : experimental constant V : volume of aeration tank, l 3. Also, the relationship between the over-all oxygen transfer coefficient and the air flow rate in the spiral flow aeration tank was expressed by the following exponential formula under the critical fixed flow rate of air.K_La=m'(Gs/V)^<n'> K_La : over-all oxygen transfer coefficient m'n' : experimental constant 4. From the above formulas, the relationship between the over-all oxygen transfer coefficient and the surface velocity or the circulating velocity in the spiral flow aeration tanks was induced, abd it was expressed as follows : [numerical formula] In the practical large aeration tank with the spiral flow system, it was found that the relationship between the surface velocity and the over-all oxygen transfer coefficient was expressed by the following formula. K_La=0.18υ^<0.4334> 5;. The over-all oxygen transfer coefficient in bubble aeration decreased rapidly in the presence of smal concentrations of Alkylbenzene sulfonate.At high concentrations of Alkylbenzene sulfonate, the over-all oxygen transfer coefficient tended to increase slightly. 6. The aeration efficiency of the spiral flow aeration tank and the oxygen absorption per unit power decreased according to the increase of air flow rate.
社団法人日本生物工学会の論文
1963-04-15

下水処理における散気式回流曝気槽の曝気性能に関する研究

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