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Tannery Wastewater Treatment by the Oxygen Activated Sludge Process

Mamoru Kashiwaya and Kameo Yoshimoto
Journal (Water Pollution Control Federation)
Vol. 52, No. 5 (May, 1980), pp. 999-1007
Stable URL: http://www.jstor.org/stable/25040825
Page Count: 9
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Abstract

Design criteria and operational conditions are established for a treatment facility required to reduce the ${\rm BOD}_{5}$ in tannery wastewater to 20 mg/l or less. A pilot-plant-scale study, by three kinds of oxygen activated sludge processes, of tannery wastewater alone and tannery wastewater combined with municipal wastewater was carried out over a period of 15 months in the city of Himeji, Hyogo Prefecture, Japan. The study showed that the target ${\rm BOD}_{5}$ could be maintained in the effluent by the single-stage process, and that when the influent temperature is below 10°C, tannery wastewater alone requires aeration tank detention time of more than 25 hours, while combined with municipal wastewater it requires 12 hours. When tannery wastewater is treated by the oxygen activated sludge process, pH control is not required; however, if tannery wastewater is treated alone, or if the proportion of municipal wastewater to tannery wastewater is comparatively low, it is necessary to add phosphorus as a nutrient.

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