多段塔型曝気槽を用いる活性汚泥プロセスの処理特性

概要

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The objective of this study was to clarify experimentally the advantages, if any, of a vertical multistage tower aeration tank system, particularly with respect to purification efficiency and sludge settleability, in comparison with a complete mixing system. The following conclusions could be drawn by comparing both systems. (1)The experimental results showed that in a multistage tower aeration tank with a large Peclet number, the effluent DOD_<Cr> concentration and sludge yield can be reduced and activated sludge with good settleability can be produced for any applied COD_<Cr> loading rate compared with a complete mixing aeration tank. (2)The distribution of the COD_<Cr> concentration and respiration rate of activated sludge showed that organic substances were rapidly transferred from the liquid phase to activated sludge floc by biosorption in the inlet compartment and that subsequent oxidative biodegradation occurred throughout the other compartment. (3)The removal of organic substances by the biosorption mechanism followed the first order reaction kinetics. The biosorption rate constant and maximum adsorbed organic substance content of activated sludge were 25 m^3/kg MLSS・d and 0.53 kg COD_<Cr>/kg MLSS, respectively.
社団法人日本生物工学会の論文
1992-09-25