膜科学与技术

节能电渗析用于海水纳滤产水二级脱盐研究

作者：刘颖，王俐丹，王建友

单位：南开大学环境科学与工程学院，天津300350

关键词：电渗析；脱盐；运行参数；能耗

出版年,卷(期):页码： 2018,38(3):97-103

摘要：

针对主流海水淡化工艺SWRO在高操作压力和高能耗等方面的缺陷，提出“纳滤/倒极电渗析（NF/EDR）”集成膜过程低能耗海水淡化新工艺。本文属于ED过程工艺优化部分的研究。其进水为NF产水，电导率为8790μS/cm，ED用膜为常规异向离子交换膜，以脱盐率和能耗为主要指标，对ED运行参数和工艺进行综合优化。结果表明，当淡水流量为150L/h，浓水流量为120L/h，采用一级两段膜堆构型，两段膜对数比为27/23时，ED系统的脱盐率可达90%，本体吨水能耗低至0.98KWh。研究表明基于节能ED 工艺与高脱盐NF工艺集成，有望实现低能耗海水淡化。

For the high pressure and high energy consumption of Seawater reverse osmosis (SWRO) desalination technology, an energy-saving “NF/EDR” integrated membrane process for seawater desalination has been proposed in our study. This manuscript is the key study about the optimization of electrodialysis (ED) process. The feed water is the NF output with the conductivity of 8790 μS/cm and the adopted ED membranes are conventional heterogeneous ion exchange membranes. Taking the desalination rate and energy consumption as the main indicators, the ED operating parameters and process are comprehensively optimized. The results show that with the dilute stream flow of 150 L/h, concentrate stream flow of 120 L/h and the ED stack consisted of one stage with two passages, with the proportion of 27/23 in cell pairs, the desalination rate of ED process could be about 90% and the energy consumption was 0.98 KWh/(m3 produced water). Research shows that based on the integration between the energy-saving ED process and high desalination NF process, it is expected to achieve low-energy seawater desalination.

刘颖（1988-），女，内蒙古赤峰市，南开大学博士后，研究方向：膜分离技术，E-mail:chifengliuying@126.com. 通讯作者，E-mail: wangjy72@nankai.edu.cn.

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