Application of ultrafiltration and nanofiltration treatment for the closure of E-stage bleaching plant effluent

  • 31/12/2008

  • IPPTA

Pulp and paper industry is facing a major problem on account of increasing scarcity of water and stringent discharge norms introduced by Central Pollution Control Board (CPCB) in the form of CREP (Corporate Responsibility for Environmental Protection). Large proportion of water being discharged presently will have to be recycled back into the system at the appropriate intake points with/without treatment. Membrane filtration technology, particularly Ultrafiltration and Nanofiltration are being adopted increasingly in the paper mills for closing of process water streams. E-Stage bleaching effluent is very well suited for ultrafiltration process, because of its comparatively small volume and high molecular weight substances in it. In the present study, extraction stage (E-stage) bleach plant effluent was treated in the Ultrafiltration (UF) and Nanofiltration (NF) from the point of view of system closure.