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aOxygen consumed at 20°C during a 5-day incubation with acclimated microorganisms.

aOxygen consumed at 20°C during a 5-day incubation with acclimated microorganisms.

whereas sulfite pulping and bleaching plant wastes are acidic. Chemical recovery is essential in keeping oxygen-depleting materials low. Large calcium bisulfite mill effluents may have oxygen demands equivalent to 2,000,000 or 3,000,000 people. Effluents display some toxicity to aquatic fauna, albeit of a low order. Neutral and higher pH value effluents are darkly colored, which is aesthetically undesirable and inhibits photosynthesis. In smaller streams, fish downstream from pulp mill outfalls can have tainted flesh. Odor and taste imparted to receiving waters can also interfere with the subsequent use of the stream for drinking water. Wind and wave action can create foam on receiving waters, and inorganic salt content may prevent use in irrigation.

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