A study of irradiation in the treatment of wastewater

A grafting copolymer of starch and acrylamide was prepared by Co-60-gamma pre-irradiation. After purification, the copolymer was modified by a cationic reaction to form a cationic copolymer. The structure of the cationic copolymer was identified by IR and NMR spectroscopy. Using the industrial and sanitary municipal wastewater from the Factory of Wastewater Treatment of Gaobeidian in Beijing as the study sample, three-treatment methods: flocculation deposition, flocculation deposition combined with irradiation and the direct irradiation were carried out. COD was applied to evaluate the treatment effect. The preliminary results show that the method of flocculation deposition combined with gamma irradiation was effective than the other two. (C) 2002 Elsevier Science Ltd. All rights reserved.