文章摘要: 中图分类号:X791 文献标识码:A 文章编号:1009-2455(2000)05-0001-03 Developments in Application of High-Molecular Flocculants in the Treatment of Wastewater from Printing and Dyeing PAN Lu-ting? ...... 中图分类号:X791 文献标识码:A 文章编号:1009-2455(2000)05-0001-03 Developments in Application of High-Molecular Flocculants in the Treatment of Wastewater from Printing and Dyeing PAN Lu-ting? XIAO Jin
Abstract:Coagulation process is one of the most important methods among water treatment technologies.Applications of organic?inorganic and natural high-molecular flocculants in printing and dyeing in recent years are introduced with brief commentary. Key words:wastewater from printing and dyeing;flocculant;wastewater treatment
我国印染企业每天排放废水约为400×104 m3,这些废水成分复杂、色度大、浓度高且生物难降物质多。特别是近年来,合成纤维的品种和数量的增加以及化学浆料(PVA)代替淀粉在印染
1 无机高分子絮凝剂在印染废水处理中的应用
1.1 聚铝絮凝剂 碱式氯化铝(PAC)是水处理中最常用的絮凝剂之一,在处理印染废水中应用最为广泛。上海第一丝绸印染厂生化调节池中的印染废水,是以活性染料为主,直接染料为辅,属于高色度、高浓度废水,苏玉萍等[1]采用混凝法对此废水进行处理,当PAC投加量为700~900 mg/L,pH值控制在5.4~6.6时,脱色率可达93%,且PAC较其它絮凝剂所产生的矾花大、沉降速度快,另外,研究还发现对于以活性染料为主的印染废水,PAC的投加量要比处理疏水性染料时的投加料要多。卢俊瑞[2]采用絮凝法处理溴氨酸活性染料生产废水,当PAC的投加量2 g/L时,脱色率和COD去除率均在90%以上。此外,季民等[3]对染色废水混凝脱色机理的研究进一步表明,聚铝混凝脱色的pH值范围广,对于大部分染料废水,都可获得较理想的脱色效果,但对单偶氮、低分子量含水溶性基团较多的亲水性染料,则不能采用聚铝絮凝剂脱色。 1.2 聚铁类絮凝剂