Abstract
Removal of COD and AOX (Adsorbable Organic Halide) from bleached sulfite pulp mill effluent was studied with the objective of applying a UASB process for AOX control at bleached pulp mills. A mixture of chlorination stage filtrates and evaporator condensate (2: 1) was supplied to a 30liter UASB reactor. It was treated successfully, achieving about 85% removal of COD and 40% to 50% removal of AOX under a COD space load of 17kg/m3/d at 35°C. When the reactor was fed with a mixture of alkaline extraction stage filtrates and evaporator condensate (2: 1), COD and AOX removal ratios were about 80% and about 30% respectively, under a COD space load of 12kg/m3/d at 35°C. The AOX removal was found to be inversely proportional to COD space load.
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