摘要
针对碱度大、COD高、组成复杂的碱减量—印染混合废水,采用高碱度下直接混凝再酸析相结合的方法进行预处理,取得理想效果。试验结果表明,在高碱度条件下先加入镁盐及少量高分子絮凝剂,可去除大部分可溶性及不溶性污染物;再通过降低pH的酸析法,能有效去除废水中的色度、浊度,大大降低COD。在MgSO4用量为800～1500mg/L,阴离子聚丙烯酰胺用量为2mg/L,酸析pH小于3.0时,色度去除率达97%,COD去除率达92%,浊度去除率近100%。
Textile wastewaters from alkali reduction, printing and dyeing operations are usually highly basic, turbid and have many COD and color constituents present in high concentrations; therefore, effective pretreatment is required to make them biotreatable. Direct acidification of one such wastewater failed because it resulted in heavy production of colloidal products. Coagulation and flocculation, using 800- 1 500 mg/L of MgSO4 and 2 mg/L of a high molecular weight organic flocculant HPAM, and followed by acidification to a pH of 〈3.0, achieved excellent pretreatment performances COD, color intensity and turbidity of the wastewater sample were reduced by 92%, 97%, and nearly 100%, respectively.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2006年第5期377-380,共4页
Environmental Pollution & Control
基金
浙江省重大科技攻关资助项目(No.2004C11020)。
关键词
碱减量
印染
混合废水
混凝
酸析
预处理
Alkali decrement Printing and dyeing Mixed wastewater Coagulation Acidification Pretreatment
