Resourceful treatment system and method for efficient reuse of salt-containing mine water

Abstract

The invention provides a resourceful treatment system and method for efficient reuse of salt-containing mine water. According to the invention, the salt-containing mine water enters a hollow fiber nanofiltration membrane device, soluble salts such as MgSO4, Na2SO4, MgCl2 and NaCl are intercepted under the pressure of 0.1 MPa-5MPa, produced water can be directly reused, concentrated water is softened and then subjected to hardness removal through reverse osmosis concentration coupled with chemical induced crystallization, and reflux circulation is performed until the osmotic pressure of a reverse osmosis concentration device is reached; then obtained concentrated water is subjected to nanofiltration salt separation and further concentration; and then obtained concentrated water enters a bipolar membrane ion exchange device to obtain recyclable acid liquor and alkali liquor, or the concentrated water is subjected to concentration and evaporative crystallization to obtain crystallized salt. In order to improve the reuse rate of mine water resources, salt ions in the mine water are partially removed under low pressure by adopting a hollow fiber nanofiltration membrane technology, and meanwhile, the water production rate of first-stage RO is improved to 90% or above by using RO coupled with chemical induced crystallization; and concentrated strong brine can be treated by using a bipolar ion exchange membrane technology, and an acid-base solution which can be recycled for a water treatment system is obtained at the same time, so real zero discharge of wastewater is realized.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a resource treatment system and method for efficient reuse of saline mine water. Background technique [0002] my country's water resources and coal resources are in a reverse distribution. Coal mining causes damage to the stratum, groundwater flow field and surface of the mining area, resulting in the interruption of natural water sources or the loss of groundwater storage due to the formation of mine water flowing into goafs, and the destruction of the ecological environment. Seriously, the effective utilization of mine water has become a top priority that affects water use in mining areas and even in entire water-deficient areas. Therefore, the area where the coal mine is located puts forward higher standards for the quality of mine water after treatment, and even requires the surface to meet the requirements of Class III water standards. This makes mine water unable to...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low reuse rate of mine water resources, the present invention provides a resource treatment system and method for highly efficient reuse of salt-containing mine water, using hollow fiber nanofiltration membrane technology to partially remove salt ions in mine water under low pressure At the same time, RO+ chemically induced crystallization is used to improve the water production rate of the first-stage RO, and the bipolar ion exchange membrane technology is used to treat the high-salt concentrated solution while obtaining a reusable acid-base solution, so as to realize the real zero discharge of wastewater, and the RO Water production rate increased to over 90%

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