Kinetics of biological phosphorus behavior in sequential batch reactor under anaerobic/aerobic condition.

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A kinetics study of biological phosphorus release/uptake in biomass under anaerobic/aerobic (A/O) condition was made in a laboratory sequential batch reactor (SBR) system. The ratios of P/BOD and TN/BOD of influent feed solution for increasing the intracellular phosphorus must be greater than about 0.01 and 0.13 in this system. Phosphorus uptake was correlated to the uptake of K+ and Mg2+ as ΔK/ΔP = 0.28, ΔMg/ΔP = 0.36 by molar ratios.<BR>The rate of phosphorus release for endogeneous respiration of the biomass under anaerobic condition can be described by using a Monod-type equation with respect to phosphorus content in the biomass, and the values of the rate constant, Krp, and the saturation constant, Kkp, are 1.1 × 10–3 h–1 and 1.4 × 10–3 kg/kg respectively. The rate of luxurious phosphorus uptake at the aerobic stage can be expressed by a first-order kinetic equation based on Pxm–Px with the rate constant, Ku, is 0.017 h–1.

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