On the Treatment of Industrial Wastewaters Carrying Oily Emulsions,Surfactans and Sulphates

The successful purification of waste waters from the leather and textile industries is possible by flocculation with aluminium sulphate and alkaline-earth chlorides. BaCl₂ proved very successful among the applied alkaline-earth chlorides. The removal of oily emulsions and tensides was very effective when the waste waters were treated by a two-stage flocculation process. By an excessive application of BaCl₂ also a reduction of sulphate was obtained. Wastewaters treated in the neutral range showed a purification effect of 98 %, so that the effluents were clear and colourless. The time of sedimentation amounted to 1 h only. Segregated oil was successfully removed with the aid of a very absorptive polyurethane foam.