本发明属于海水淡化和浓海水资源化利用领域,涉及一种化学法-电渗析-反渗透集成浓海水软化与浓缩工艺。本发明以化学沉淀法脱钙及反渗透、1价选择性离子交换膜电渗析、纯浓缩膜电渗析三种膜单元系统为依托,达到以下技术指标,浓缩盐水能通过进一步对接提浓工艺,为氯碱、纯碱等工业提供液体盐原料,TDS需不低于200000mg/L；淡水符合《生活饮用水卫生标准》关于TDS小于500mg/L,所有产水必须能达到直接排海或工艺内部循环回用要求,减缓浓海水直接排海造成的环境污染及海洋生态失衡问题,实现海水水资源及富集的化学资源的综合利用,从而均摊并降低海水淡化成本。

The invention belongs to the field of seawater desalination and concentrated seawater resource utilization, and relates to a chemical method-electrodialysis-reverse osmosis integrated concentrated seawater softening and concentration process. The invention relies on three membrane unit systems of chemical precipitation method decalcification and reverse osmosis, monovalent selective ion exchange membrane electrodialysis, and pure concentrated membrane electrodialysis, which reaches the following technical indicators. The concentrated brine can be further connected to the concentration process. To provide liquid salt raw materials for chlor-alkali, soda ash and other industries, the TDS needs to be no less than 200,000 mg/L, fresh water meets the "Drinking Water Hygiene Standards" regarding TDS less than 500 mg/L. All produced water must be able to meet the requirements of direct discharge to the sea or internal recycling of the process, reduce environmental pollution and marine ecological imbalance caused by direct discharge of concentrated seawater, and realize the comprehensive utilization of seawater water resources and enriched chemical resources, so as to share and reduce the cost of desalination.