充てん塔式ろ床法における回分式処理の浄化速度 : 充てん塔式ろ床法による有機性廃水の処理(第2報)

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Purification rates of batch (or recirculation) treatment with the tower-type packed biofilter was investigated over two months using a laboratory-scale filter (100 mm in diam. and 770 mm in height) packed with 400 glass spheres (25 mm in diam.). Air was supplied to the filter at about 90 m^3/m^2/day to maintain the biofilter, aerobic, and temperature was controlled at 22℃ throughout.In operating and designing tower-type packed biofilters for batch processes, it is important to consider three parameters which affect COD removal rate -operational time, recirculation rate and batch volume.It was found that for a given batch volume and recirculation flow rate, COD remaining of the synthetic waste water in the batch tank was directly related to the operational time with first-order kinetics until COD removal efficiency reached around 90%. COD removal capacities of the biofilter could then be rapidly estimated. Although COD removal capacities were markedly affected by the recirculation flow rate at up to 110 m^3/m^2/day, these leved off at recirculation flow rates of more than 146 m^3/m^2/day. These effects probably depend on the fraction of the active biofilm area actually drenched in removing the organic matter. Therefore, it is recommended that the optimum recirculation flow rate should be chosen in order to make maximum use of the active biofilm existing within the biofilter and to avoid sloughing off most of the biofilm attached to the medium.For a recirculation flow rate between 110 and 238 m^3/m^2/day, the COD removal capacity of the biofilter was 3.0 to 5.0 (average 4.0)kg COD/m^3/day in the range of batch volume 2×10^<-3> to 12×10^<-3>m^3. Under the operating conditions, it was concluded that COD removal efficiency depended on the overall contact number of the waste water with the biofilter during a given operating time.
社団法人日本生物工学会の論文
1977-05-25

充てん塔式ろ床法における回分式処理の浄化速度 : 充てん塔式ろ床法による有機性廃水の処理(第2報)

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