Studies on Treatment of Carbohydrate Wastewater by Contact Biooxidation Using a Fixed Bed

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A contact biooxidation process using a fixed bed was investigated for the treatment of carbohydrate wastewater. Filamentous microorganisms predominantly grew on the bed. The attachment of the microorganisms to the bed was very stable under the aeration from the bottom of the bed; the amout of microorganisms sloughed off the bed was negligible. A mathemarical model of the continuous system was built and evaluated with the aid of computer. The biological coeffecients for the computation were obtained from unsteady state experiments in continuous systems, and from batch experiments, as follows : μ_m, 0.5 day^<-1>; Ks, 70ng/l; Y, 0.53; kd, 0.13 day^<1-> and fd, 0.67. The continuous process was carried out for influent COD ranging from 90 to 350 mg/l and dilution rates from 0.28 to 3.4 day^<-1>. The experimental results in the continuous systems showed that the effluent COD in a steady state was not affected by the organic loading because of its total oxidation in this system, but that the accumulated biomass in the fixed bed was influenced by the organic loading. These experimental date agreed well with the theoretical curves.It was concluded that the fixed bed system could readily be applied to the treatment of carbohydrate wastewater, and that the mathematical model developed by the present authors might be useful in practical operations.
社団法人日本生物工学会の論文
1977-06-25