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Biological Treatment of Bleach Plant Wastes

G. E. Charles and G. Decker
Journal (Water Pollution Control Federation)
Vol. 42, No. 10 (Oct., 1970), pp. 1725-1739
Stable URL: http://www.jstor.org/stable/25036795
Page Count: 15
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Biological Treatment of Bleach Plant Wastes
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Abstract

A review of the criteria leading to the design of a low-rate activated sludge system for the treatment of bleach plant wastes is given. The system consists of neutralization, seeding, and aerating for 24 hr the mixed acid and caustic streams before discharging into the receiving waters. Mill data since startup in May 1966 show that the treatment system provides treated effluent meeting the fish bioassay toxicity requirements that prevail. Biochemical oxygen demand reduction levels exceed 60 percent. Sufficient nutrient addition is necessary for good performance during the winter period. The values of approximately 100 :5 :1 for ${\rm BOD}_{5}$ removed :N :P give best results. Residual dissolved oxygen in the treated effluent insures good bacterial activity. Treatment costs are about $1.40/ton (1.56/metric ton) of paper produced.

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