煤渣复合混凝剂去除溶解态多核芳香烃及机理的研究

Study on the Mechanism for Removing PAHs from Coal Tar Processing Wastewater by Coagulation

比较了Ｃａ（ＯＨ）２、Ｃａ（ｏＨ）２＋Ｆｅ２（ＳＯ４）３、硅藻土和煤渣与聚丙烯酰胺（ＰＡＭ）组成的复合混凝剂，对焦油加工过程废水中的多环芳烃的处理效果。发现煤渣和ＰＡＭ组成的复合混凝剂对废水中的多环芳烃有显著的去除作用，对萘的去除率可达４０％以上，说明投加人工致浊物质的方法可有效地去除废水中溶解态的多环芳烃。确定了以煤渣为混凝剂的处理方案并考察煤渣混凝剂处理多环芳烃的影响因素，探讨了其机理，得出多环芳烃主要通过吸附作用而除去，并用Ｆｒｅｕｎｄｌｉｃｈ和Ｌａｎｇｍｕｉｒ等温式进行拟合，发现其吸附作用呈单分子层形式，为进一步试验提供了理论依据。

The complex coagulant composed of coal cinder and PAM can remove PAHs from coal tar processing wastewater efficiently, and the removal of naphthalene is more than 40%. This indicates that the method of adding material to increase turbidity of wastewater can remove the dissolved PAHs. Factors influencing removal and the mechanism for removing PAHs by coaguation are discussed.