纳滤-反渗透集成处理海水淡化浓盐水工艺研究

发布时间：2018-10-29 20:41

【摘要】：以减排和资源再利用为目的,基于化学法与膜法相结合的海水淡化浓盐水综合利用工艺,系统研究了脱硬后浓海水利用纳滤(NF)脱硫酸根、通过反渗透(RO)实现海水二次淡化和深度浓缩的工艺过程。结果表明,NF270膜、DL2540NF膜分别能将SO_4~(2-)的浓度降低到3 mmol/L和2 mmol/L以下;RO对脱硬后浓海水中各离子均有较好脱除效果,达99%,浓缩1.45倍。工艺将化学法脱硬、NF、RO等膜法分离与浓缩技术综合考虑,能大幅提高淡水回收率,为氯碱工业提供液体盐原料,有利于降低淡化成本。
[Abstract]:In order to reduce emission and reuse of resources, based on the comprehensive utilization process of desalination of concentrated brine by chemical method and membrane method, the desalination of sulfate from concentrated seawater by nanofiltration (NF) after desalination was systematically studied. The process of secondary desalination and deep concentration of seawater was realized by reverse osmosis (RO). The results showed that NF270 membrane and DL2540NF membrane could reduce the concentration of SO_4~ (2-) to less than 3 mmol/L and 2 mmol/L, respectively, and RO had a good removal effect on each ion in desalinated sea water, up to 99% and 1.45 times concentration. Chemical de-hardening, NF,RO and other membrane separation and concentration techniques can greatly increase the recovery of fresh water, provide liquid salt raw materials for chlor-alkali industry, and reduce the desalination cost.
【作者单位】：华东理工大学国家盐湖资源综合利用工程技术研究中心;
【基金】：国家科技支撑项目(2015BAB10B01) 国家重点研发计划(2016YFC0401203)
【分类号】：P747

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