Abstract
Abstract The pulp and paper industry discharges about 300 m3 of wastewater with 50 kg SS (suspended solid), and 200 kg of COD per tonne of paper. Further, about 50 kg of lignin, which imparts brown colour, is also released per tonne of paper. Treatment technology for the removal of SS and BOD is available while colour removal is still not viable. In the present paper, alum clay treatment of the coloured waste‐water has been studied. Loading to a settling tank has been determined. The performance of a lab model of a clariflocculator has been evaluated. Sludge rewatering on sand beds has been attempted.
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