Levels of total organic hallde (TOX) in a Kraft mill wastewater ranged from 26,000 to 60,000 µg/l. An aerated stabilization basin (ASB) proved capable of removing one-third to one-half of both the total TOX as well as lower molecular weight (<l,000) TOX. Influent. TOX levels varied as a function of in-mill production activities. Removal of specific size fractions of of organic halide were influenced to different extents by influent variations and seasonal effects. The major removal mechanism appears to be biosorption of TOX onto settling biomass, followed by anaerobic dehalogenation within the benthal layer of the ASB.

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