A process of treating waste paper

摘要

Waste water containing organic waste material is treated by a process comprising introducing the waste water into a treatment tank, subjecting the water in the tank to aeration, allowing the organic waste material to undergo aerobic digestion and/or oxidation and then clarifying the resulting slurry containing solid particles of matter. The slurry is clarified by subjecting it to treatment in a preflocculation zone with one or more flocculating agents to coagulate the solid particles as flocs and imparting to the flocs as they are forming in the slurry a rolling action which results in the production of a heavily coagulated slurry containing substantially uniform, large, dense flocs of coagulated matter. The coagulated slurry is then introduced into a clarifier tank under conditions of laminar flow while avoiding disruption or breakage of the flocs. The dense flocs then settle to the bottom of the tank leaving a clarified liquor.