AN IMPROVED PROCESS FOR THE TREATMENT OF PAPER MILL BLACK LIQUOR TO PRODUCE ENVIRONMENTALLY ACCEPTABLE CLEAN WATER

摘要

An improved process for treatment of paper mill black waste liquor to produce clean water which comprises pre-conditioning the black liquor by known method, adding coagulating agents and cationic magnofloc in the range of 50 mg to 150mg/l and mixing well, allowing to settle for a period ranging from 60 to 180 minutes, separating the liquid from residue and then bleaching the solution with chlorine for a period ranging from 60-180 minutes to get environmentally acceptable clean water.