Seawater resourceful treatment process

Abstract

The invention discloses a seawater resourceful treatment process, which comprises the following steps that seawater is pretreated and then enters a nanofiltration unit to be subjected to salt separation treatment; nanofiltration produced water obtained after nanofiltration treatment enters a reverse osmosis unit to be pre-concentrated, and obtained reverse osmosis produced water is sterilized and disinfected to serve as domestic water; and reverse osmosis concentrated water obtained through reverse osmosis treatment enters an SCRO unit for deep concentration, a part of SCRO concentrated water obtained through treatment of the SCRO unit is used for reducing the osmotic pressure difference of the two sides of an SCRO unit membrane and finally flows back to the reverse osmosis unit with SCRO produced water to be concentrated again, and the other part of SCRO concentrated water serves as a raw material of chlor-alkali industry to enter an electrolysis unit for electrolysis production of sodium hydroxide and chlorine. According to the seawater resourceful treatment process, high concentration of seawater is achieved under the condition of low energy consumption while generated concentrated water can be used as a raw material in the chlor-alkali industry, and marine pollution and crude salt consumption in the chlor-alkali industry are effectively reduced, so that seawater resourceful utilization is achieved.

Description

technical field [0001] The invention relates to the technical field of seawater treatment, in particular to a seawater resource treatment process. Background technique [0002] my country's fresh water resources are scarce and unevenly distributed. With the rapid development of economy, the shortage of fresh water resources has increasingly become the bottleneck of development. Seawater desalination resource utilization is an important means to solve the above problems. At present, common seawater desalination technologies are mainly divided into membrane method (reverse osmosis, electrodialysis) and thermal method (multi-stage flash evaporation, low-temperature multi-effect and pressure steam distillation), among which reverse osmosis membrane method is the most common seawater desalination method in my country is commonly used. [0003] The conventional seawater desalination process of reverse osmosis membrane is mainly pretreatment + reverse osmosis + disinfection efflux...

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Problems solved by technology

[0004] The above reverse osmosis membrane seawater desalination process has the following problems: the discharge of concentrated brine after membrane concentration will lead to an increase in ocean salinity, especially in semi-enclosed sea areas where the seawater renewal rate is slow, resulting in uneven salinity distribution

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