American Society of Civil Engineers

Performance Enhancement of Suspended-Growth Reactors with Phototrophs

by Ju-Sheng Huang, (Prof., Dept. of Envir. Engrg., Natl. Cheng Kung Univ., Tainan, Taiwan 701), Charng-Gwo Jih, (Assoc. Prof., Dept. of Envir. Engrg. and Health, Tajen Junior Coll. of Pharmacy, Pingtung, Taiwan 907), and Tso-Jen Sung, (Grad. Student, Dept. of Envir. Engrg., Natl. Cheng Kung Univ., Tainan, Taiwan 701)

Journal of Environmental Engineering, Vol. 125, No. 6, June 1999, pp. 501-507, (doi:

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Document type: Journal Paper
Abstract: The performance of the conventional activated-sludge reactor (CSAR) treating high-salinity, fish market wastewater (212–345 mg biochemical oxygen demand/L) can be enhanced by the addition of phototrophic bacteria (PTB). Under aerobic conditions, the PTB are not capable of synthesizing phototrophic pigments, and the decay rates of PTB in the light and dark follow first-order kinetics with rate constants of 0.187 and 0.229 day–¹, respectively. Statistical analyses of kinetic constants k, Y\dT, a, and b indicate that the addition of PTB into the ASR (PASR) improves the treatment efficiency but it dies not affect sludge production and the specific oxygen-utilization rate. From parametric sensitivity analyses, substrate effluent concentrations of the CASR and PASR are most sensitive to the parameters θ\dc, k, and Y\dT but least sensitive to the parameter k\dd. According to model calculation, the predicted biochemical oxygen demand and chemical oxygen demand removal efficiencies of the CASR and PASR are in good agreement with the experimental data.

ASCE Subject Headings:
Water treatment
Activated sludge
Wastewater management