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污染控制技术及原理

Enhanced coagulation on a typical high alkalinity and micro-polluted North-China source water

摘要：以高碱度、受有机物污染的典型北方水体为例,探索适宜的强化混凝技术.在水质调查的基础上,提出适合水质特征的强化混凝目标.研究了高碱度水体强化混凝技术方法.研究表明,可以通过3条技术途径提高水体中有机物的去除效率.其一在混凝前优化pH,促进絮凝剂水解形成中聚体,AlCl₃在pH6左右,FeCl₃在pH5左右时,有机物去除率可以提高一倍左右;其二是强化沉淀软化;其三是絮凝剂优化.结合我国实际情况,通过对传统絮凝剂进行改性,研制出了适合我国北方水质特征的高效絮凝剂,能较传统絮凝剂将有机物去除率提高30%以上.

Abstract：The paper study the enhanced coagulation criterion for China through a case study of high alkalinity, micro-polluted north-china water. The paper render the seasonal enhanced coagulation target through bench test, based on water characteristics investigation. Three measureses were found in the paper for this type water, the frist is is adjusting pH during coagulation in favor of mid-polymer product, which produce well at about pH 6 for AlCl₃, and pH 5 for FeCl₃, at those pHs the removal of TOC increase more than one time; The second is enhanced precipitative softening, the third is coagulant reform. We have succeeded reforming conventional coagulant for this water, which could increase 30% more NOM removal than conventional coagulants,which is very efficient in turbidity removal also.