Removal of colour and turbidity in pulp and paper mill effluents using polyelectrolytes.

The present study was undertaken for removal of the colour, turbidity and COD from pulp and paper mill effluents using polyelectrolytes for pollution control and its safe disposal. Based on the pH of effluent and nature of colour imparting substance, suitable polyelectrolytes have been selected and used. A novel method of treating the above effluent with 0.2 ml/L of Rishlyte 80 L for the removal of colour, turbidity and COD has been found to be optimal and techno-economically viable when compared with the conventional method of treatment with alum.