Method for desalting bitter by electromembrane method and equipment thereof

Abstract

The invention relates to a method for desalting bitter by an electromembrane method and equipment thereof. The equipment comprises three parts, including a bitter pretreatment system, a reverse osmosis desalting system and a membrane regenerating system, wherein the bitter pretreatment system comprises a microelectrolysis equipment unit, a sand leach equipment unit, an active carbon equipment unit and the like; the reverse osmosis desalting system comprises a high-pressure pump, a reverse osmosis membrane assembly, an active carbon adsorbing column, a fresh water storage tank and an energy recoverer. The purified bitter is obtained by using the bitter pretreatment system to remove algae, planktons, solid suspended matter, charge colloids and bacteria. Fresh water and concentrated water are obtained by carrying out reverse osmosis desalting on the purified bitter obtained by the bitter pretreatment system. The fresh water obtained by adopting the method meets Sanitary Standard for Drinking Water GB5749-2006, and therefore, the fresh water can be directly used as water for production and domestic water.

Description

technical field [0001] The invention relates to a brackish water desalination method and its equipment, in particular to a brackish water desalination method and equipment which adopts micro-electrolysis to pretreat the brackish water and then undergoes membrane separation and desalination. Background technique [0002] The shortage of fresh water resources has become one of the three major environmental problems in the 21st century. Therefore, the desalination technology of brackish water has become a high-tech that all countries attach great importance to, and it is also one of the important measures to solve the water resource crisis in our country. In some areas of our country, fresh water resources are very scarce, but brackish water resources are relatively abundant. Therefore, asking for fresh water and resources from brackish water is a realistic choice to solve the shortage of fresh water resources in these areas. A major measure of social sustainable development ha...

AI Technical Summary

Problems solved by technology

[0007] The existing reverse osmosis method mostly adopts the flocculation pretreatment process for the pretreatment of brackish water. The flocculation treatment takes a certain amount of time. In order to ensure continuous operation, multiple flocculation tanks and sedimentation tanks are required, which not only occupy a large area, but also The production process is also longer

[0008] 2. The cost of desalination is high

[0009] ①. In the pretreatment of brackish water, the addition of chemical substances (flocculant) is used for flocculation treatment, which increases the cost of raw materials and increases the cost of desalinated water

[0010] ②. In the pretreatment of brackish water, the water pretreatment process of flocculation is adopted, the production process is longer, the investment in equipment is larger, and the depreciation cost per ton of water (desalinated water) is higher;

[0011] ③. In the pretreatment of brackish water, the brackish water pretreatment process of flocculation is adopted, the production process is longer, the energy consumption of equipment operation is large, the energy consumption of per ton of water (desalinated water) is high, and the energy consumption cost is high

[0012] 3. Large investment in equipment

This kind of brackish water pretreatment process is relatively long. Second, because the added flocculant cannot be completely precipitated, part of it enters the brackish water, which increases the operating burden on the operation of the reverse osmosis membrane. The system is complex and the production equipment big investment

[0014] 4. It is difficult to comprehensively utilize brackish water resources

[0015] Due to the brackish water pretreatment process of flocculation, the added chemical substances cannot be completely precipitated, and some of them enter the brackish water and exist in the concentrated water (brine) after desalination, which increases the difficulty for the comprehensive utilization of concentrated water and makes the utilization Comprehensive utilization of desalinated brine has no economic significance

[0016] 5. Pollution of the environment

[0017] Due to the use of flocculation, a brackish water pretreatment process, the added flocculant is discharged together with the brackish water pretreatment sediment and concentrated water, thus causing certain pollution to the environment

[0018] Due to the above problems, the existing reverse osmosis brackish water desalination equipment system is huge, the equipment investment is large, and the energy consumption of production and operation is relatively high

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