Water Science and Technology Vol 35 No 7 pp 7987 © IWA Publishing 1997
Effect of biosorption on the damping of influent fluctuation in activated sludge aeration tanks
Koichi Fujie, Hong-Ying Hu, Byung-Ran Lim and Huang Xia
Department of Ecological Engineering, Toyohashi University of Technology Tempaku-cho, Toyohashi 441 Japan
To describe the organic removal performance in an activated sludge process, the effect of biological adsorption (biosorption, hereinafter) of both soluble and particulate organic substances (SOS and POS, respectively, hereinafter) on the rate of organic removal must be taken into account. This study quantitatively investigated the biosorption of organic pollutants in the domestic wastewater by the activated sludge. The capability of biosorption and the rate of bio-oxidation of organic pollutants were formulated based on the experimental results as functions of both COD concentration and temperature. The biosorption capacity of activated sludge was proportional to COD concentration in the mixed liquor originated from the influent. The kinetic expressions were combined with the equation of longitudinal liquid mixing to set up the mathematical model to predict the effluent COD, and thus to clarify the effect of biosorption on the damping of influent fluctuations of both COD concentration and the inflow rate. The model was also successfully applied to assessing the effectiveness of MLSS control strategies in equalizing the effluent water quality.
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