石灰在污泥调治中的应用及作用机理研究

THE APPLICATION AND MECHANISM OF LIME IN SLUDGE CONDITIONING

本文阐述了以污泥脱水前的化学调治作为预处理方法所进行的一项实验室研究。研究结果表明,阴离子聚丙烯酰胺——石灰法是一种有效的污泥调治方法;石灰在污泥调治中的主要作用是在pH>12的条件下提供大量的Ca(OH)_2絮体物,从而使污泥颗粒发生凝聚作用;在阴离子聚丙烯酰胺—石灰法和铁盐—石灰法中,石灰的作用是将带负电荷的絮凝剂和污泥颗粒吸附在一起,形成一种复合絮凝体。

This paper illustrates primarily a laboratory investigation carried on conditioning of sewage sludges before dewatering. The experimental investigation led to the following findings:1.The anionic polyacryiamide-lime sludge conditioning is an effective method2.Providing OH- for adjusting pH value isn' t the main role of lime in sludge conditioning. On the contrary,lime provides a lot of Ca(OH)2 which can agglomerate sludge particles on pH>12 condition.3,Ca(OH)2 adsorbs negatively-charged coagulators and sludge solids by its positively-charged species so that a complex floccule is formed,in anionic polyacrylamide-lime or iron-lime slude conditioning.