Biological Treatment of Potato Processing Wastewaters

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American Potato Journal


A bench-scale laboratory study was conducted to determine the performance of the single-stage treatment system of powdered activated carbon activated sludge reactors and the two-stage treatment system using activated sludge reactors followed by the biological activated carbon columns. Two activated sludge reactor runs and two biological activated carbon (BAC) column runs were conducted in this study. Hydraulic detention time in the aeration tank was 8, 16, and 32 hours for the activated sludge reactor runs. In run 2,4 g/1 of powdered activated carbon (PAC) were added to the activated sludge reactors to improve organic pollutant removal. The feed COD (chemical oxygen demand) was from 2668 to 3309 mg/1. For the BAC runs, the hydraulic detention time varied from 0.288 to 4.034 hours. Results indicate that 92% of COD was removed in the non-PAC activated sludge reactors, while 96% of COD was removed in the PAC activated sludge reactors. Biomass accumulation in the BAC columns improved the COD removal. Effluents from BAC columns contained 34 to 95 mg/1 COD. The two-stage treatment system of activated sludge followed by BAC process had better treatment performance than the single-stage treatment system of PAC activated sludge process. © 1987, Springer. All rights reserved.