离子交换树脂在污泥处理中的应用及展望

Overview and prospect of the application of ion exchange resin in treatment of sewage sludge

离子交换树脂(IER)因其不溶性以及可循环利用性被广泛用于废水处理,但目前仍缺乏其对污泥应用研究的综述.本文汇总了污泥中常见IER类型(阳离子交换树脂、阴离子交换树脂以及螯合树脂),并介绍了树脂的基本特性以及适用的污泥方向,其中阳离子交换树脂,尤其是强酸性苯乙烯系阳离子交换树脂,适用范围最广.IER在污泥中的应用归为4类,分别为去除/回收重金属、回收磷、胞外聚合物提取以及调理污泥,并阐述了基本应用机理以及优缺点.针对IER在污泥中应用的不足,提出未来的研究方向,包括改性或开发新型IER去除/回收污泥中的重金属,优化IER直接回收污泥中磷的方法,改进IER调理污泥的方式以及开发新型分离IER与污泥的手段.本文有助于研究人员更好的了解IER在污水厂污泥中的应用现状,优化IER处理污泥的应用方式以及开发应用于污泥处理的新型IER.

Ion exchange resins(IERs)have been widely used in wastewater treatment due to their insolubility and recyclability.There is still a lack of review on the application research in sludge.This paper summarized the common IERs used in sewage sludge(cation exchange resin,anion exchange resin and chelating resin),and introduced their basic characteristics and application direction.Among the IERs,cation exchange resin,especially strong acid styrene cation exchange resin,was the most widely used.The IERs were used in sludge for removal/recovery of heavy metals,recovery of phosphorus,extraction of extracellular polymer substances,and sludge conditioning.The fundamental mechanism,as well as the relevant advantages and disadvantages were demonstrated.Furthermore,in view of the deficiencies in the application of IERs in sludge,future research directions were proposed,including modifying or developing new IER to remove/recover heavy metals,optimizing the method for direct recovery of phosphorus,improving the mode of sludge conditioning,and developing new means of separation.This paper is beneficial for researchers to better understand the current application od IERs in sludge,to optimize the application of IERs,and to develop new IER for sludge treatment.