Efficient waste water salt separation, concentration and desalting integral device

Abstract

The embodiment of the invention provides an efficient waste water salt separation, concentration and desalting integral device, which comprises a first membrane pile region and a second membrane pileregion, wherein a cathode chamber, a concentration liquid circulation pipeline a, a freshwater circulation pipeline a and a plurality of membrane pairs a are arranged in the first membrane pile region; an anode chamber, a concentration liquid circulation pipeline b, a fresh water circulation pipeline b and a plurality of membrane pairs b are arranged in the second membrane pile region; a freshwater box a is arranged on the freshwater circulation pipeline a; a freshwater box b is arranged on the freshwater circulation pipeline b; a middle freshwater chamber is arranged between the first membrane pile region and the second membrane pile region; the membrane pairs a comprise cation exchange membranes and selective anion exchange membranes; the membrane pairs b comprise anion exchange membranes and selective cation exchange membranes. The device has the advantages that easy-to-scale concentrated brine is separated into difficult-to-scale calcium chloride concentrated solution and sodium sulfate concentrated solution; the concentrated brine softening through sodium carbonate addition is not needed; the chemical cost is reduced; during the salt classification, the waste water is subjected to desalinization; the concentrated brine desalinization is realized.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to an integrated device for high-efficiency waste water salt separation, concentration and desalination. Background technique [0002] Wastewater from the desulfurization process of power plants, coal chemical production process, and tail water from mine operations usually contain a large amount of non-carbonate, such as sodium chloride, calcium sulfate, magnesium sulfate, etc., especially sulfuric acid Highest in calcium. Calcium sulfate usually exists in the form of ions in wastewater, resulting in high hardness of wastewater, and calcium sulfate is the main substance that causes equipment scaling. When equipment is scaled, it is very easy to affect the normal operation of equipment. Therefore, it is necessary to reduce the hardness of the above wastewater. Avoid fouling of equipment. [0003] Existing methods for reducing the hardness of wastewater often use lime soften...

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide an integrated device for high-efficiency wastewater salt separation, concentration and desalination to solve the problem of high processing costs in the existing methods for reducing the hardness of wastewater

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