Hypersalinity mine water desalting device and desalting method

Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to a hypersalinity mine water desalting device and a desalting method. In the desalting device, a water inlet of a first reverse osmosis membrane unit is communicated with high-salinity mine water, and a water producing port of the first reverse osmosis membrane unit is connected with a water inlet of a second reverse osmosis membrane unit; a concentrated water port of the first reverse osmosis membrane unit is connected with a water inlet of a nanofiltration membrane unit; a concentrated water port of the second reverse osmosis membrane unit is connected with a water inlet of a third reverse osmosis membrane unit, and produced water of the second reverse osmosis membrane unit is recycled after being qualified; a water producing port of the nanofiltration membrane unit is connected with a water inlet of the third reverse osmosis membrane unit, and concentrated water of the nanofiltration membrane unit is discharged and collected; a water producing port of the third reverse osmosis membrane unit is connected with the water inlet of the second reverse osmosis membrane unit, and concentrated water of the third reverse osmosis membrane unit is discharged and collected. According to the invention, the hypersalinity mine water is desalted so that the effluent can be recycled, the utilization of water resources is improved, and the environmental protection benefit is increased.

Description

technical field [0001] The invention belongs to the technical field of sewage and wastewater treatment, in particular to a high-salinity mine water desalination device and a desalination method. Background technique [0002] High salinity mine water - a type of mine water produced in the coal mining process, the salinity (total content of inorganic salts) is greater than 1000mg / L, and the hardness is relatively high. Salinity mainly comes from K + , Ca 2+ , Na + ,Mg 2+ , Cl - , SO 4 2- Plasma, there may also be some organic pollutants. [0003] Principle of ultrafiltration—Ultrafiltration is one of the membrane separation technologies driven by pressure. It aims at separating macromolecules and small molecules. The membrane pore size is between 20-1000A°. [0004] The principle of reverse osmosis—reverse osmosis, also known as reverse osmosis, is a membrane separation operation that uses pressure difference as the driving force to separate the solvent from the soluti...

AI Technical Summary

Problems solved by technology

Generally, if you want to increase the desalination rate, you need to increase the number of reverse osmosis unit stages, but increasing the desalination rate by simply increasing the number of stages will increase the salt content of the concentrated water, making the influent concentration of the reverse osmosis membrane in the rear stage increase. Faster membrane clogging

In addition, the problem of membrane fouling and clogging can also be solved by improving membrane materials, inventing new cleaning methods, adding various new agents, and recoupling with other methods, but this often increases investment and treatment costs.

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