文章摘要: 中圖分類號:X791 文獻(xiàn)標(biāo)識碼:A 文章編號: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? ...... 中圖分類號:X791 文獻(xiàn)標(biāo)識碼:A 文章編號: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
我國印染企業(yè)每天排放廢水約為400×104 m3,這些廢水成分復(fù)雜、色度大、濃度高且生物難降物質(zhì)多。特別是近年來,合成纖維的品種和數(shù)量的增加以及化學(xué)漿料(PVA)代替淀粉在印染
1 無機(jī)高分子絮凝劑在印染廢水處理中的應(yīng)用
1.1 聚鋁絮凝劑 堿式氯化鋁(PAC)是水處理中最常用的絮凝劑之一,在處理印染廢水中應(yīng)用最為廣泛。上海第一絲綢印染廠生化調(diào)節(jié)池中的印染廢水,是以活性染料為主,直接染料為輔,屬于高色度、高濃度廢水,蘇玉萍等[1]采用混凝法對此廢水進(jìn)行處理,當(dāng)PAC投加量為700~900 mg/L,pH值控制在5.4~6.6時,脫色率可達(dá)93%,且PAC較其它絮凝劑所產(chǎn)生的礬花大、沉降速度快,另外,研究還發(fā)現(xiàn)對于以活性染料為主的印染廢水,PAC的投加量要比處理疏水性染料時的投加料要多。盧俊瑞[2]采用絮凝法處理溴氨酸活性染料生產(chǎn)廢水,當(dāng)PAC的投加量2 g/L時,脫色率和COD去除率均在90%以上。此外,季民等[3]對染色廢水混凝脫色機(jī)理的研究進(jìn)一步表明,聚鋁混凝脫色的pH值范圍廣,對于大部分染料廢水,都可獲得較理想的脫色效果,但對單偶氮、低分子量含水溶性基團(tuán)較多的親水性染料,則不能采用聚鋁絮凝劑脫色。 1.2 聚鐵類絮凝劑