有機物分解が逐次反応である場合の生物膜処理特性

抄録

A mathematical model was developed to analize the performance of anaerobic biofilm reactor. The biochemical degradation of substrate in biofilm was assumed to aconsecutive reaction. Conservative equations were derived and calculated numerically by using some dimensionless parameters indicating reactor performance and operating characteristics. Effects of the rates of diffusion in biofilm and bulk liquid flow on uptake rates, removal efficiencies and effluent characteristics were clarified.
The following results were obtained.
(1) Intermediate metabolic products are accumulated within biofilm when the value of biofilm property (M) is greater than 2 and the removal efficiency is less than 50%. There exists a region where effectiveness factor (λ_A) is greater than 1 under the condition.
(2) Although the utilization of primary substrate depends on biofilm properties and bulk concentrations of substrate, the utilization of intermediate metabolic products exhibits the different behaviour which depends on biofilm properties and the bulk concentrations or depends on biofilm properties and influent substrate concentration.
(3) The saturation constant in each reaction step evaluated by using bulk concentrations varies with biofilm properties.