废旧反渗透膜循环再利用研究现状与进展

Recycling of spent RO membranes:review of research status and progress

随着反渗透(RO)技术在水处理领域的广泛应用,全球每年有数百万计的废旧RO膜组件作为垃圾被处理处置,由此造成了环境污染与资源浪费。本文首先综述了废旧RO膜可能的循环再利用方案和相关的应用案例,为了比较不同循环方式对环境的影响,概述了通过全生命周期分析(LCA)的方法评价不同循环利用方式的环境效益和物质投入的研究进展。文章指出研究结果表明:回收利用废旧RO膜是研究RO膜末端处理的方法之一,其中包括通过使用清洗后的RO膜作为新生RO膜直接再利用、通过化学转化为其他多孔膜材料再循环使用、通过清洗RO膜拆解回收RO膜。另外,LCA在膜工艺中的分析仍以评估使用过程为主,而缺少在膜设计、膜改造和膜回收等关键过程的分析研究。

With the widespread application of reverse osmosis(RO)technology in water treatment,millions of spent RO membrane modules are disposed as ordinary waste every year,resulting in environmental pollution and resource waste.This review systematically summarizes the possible recycling schemes of spent RO membranes and gives related application cases.Then,in order to compare the environmental impact of different recycling methods,it summarizes the research progress of evaluating the environment benefit and material input of different recycling methods by means of full life cycle analysis(LCA).The results show that the recycling of spent RO membrane is one of the end treatment methods of RO membrane,which includes the direct use of the spent RO membrane after cleaning as a new one,chemical transformation into other porous membrane material,and dismantling and cleaning RO membrane.In addition,the LCA in membrane technology still mainly focuses on evaluating the use process,while that on other key processes such as membrane design,membrane modification and membrane recovery is rare.