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Resourceful treatment process of industrial high-concentration brine

A treatment process, a technology for concentrated brine, which is applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. and other problems, to achieve the effect of smooth sales channels, comprehensive utilization of waste resources, and high economic value

Pending Publication Date: 2020-10-13
SHANGHAI KAIXIN ISOLATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, sodium sulfate is a natural salt resource as well as many chemical processing by-products, and its abundance makes it inexpensive and less economical to recycle
Moreover, the sodium sulfate recovered from the wastewater of coal chemical industry, thermal power plant and other industries generally contains miscellaneous salts, such as sodium chloride, and the mixed salts cannot be reused as industrial salts, and can only be disposed of as solid waste

Method used

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  • Resourceful treatment process of industrial high-concentration brine
  • Resourceful treatment process of industrial high-concentration brine

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Experimental program
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Effect test

Embodiment approach 1

[0042] A resource treatment process for industrial high-concentration brine, such as figure 1 described, including the following steps:

[0043] (1) Sodium sulfate wastewater or wastewater containing sodium sulfate goes through the pretreatment process to remove impurities in the wastewater that affect the operation, use and life of the anion exchange resin, such as suspended solids and fine particles in the wastewater, according to the suspended solids in the wastewater If the concentration of suspended solids in wastewater is lower than 5 mg / L, no pretreatment is required; if the concentration of suspended solids in wastewater is 5-15 mg / L, pretreatment can be selectively carried out; If the concentration of suspended matter in the wastewater is higher than 15mg / L, it needs to be pretreated before entering the ion exchange resin device. Generally used pretreatment methods, according to the concentration of suspended solids in wastewater, choose different technical means or ...

Embodiment approach 2

[0054] A resource treatment process for industrial high-concentration brine, such as figure 2 described, including the following steps:

[0055] (1) Sodium sulfate wastewater or wastewater containing sodium sulfate goes through the pretreatment process to remove impurities in the wastewater that affect the operation, use and life of the anion exchange resin, such as suspended solids and fine particles in the wastewater, according to the suspended solids in the wastewater If the concentration of suspended solids in wastewater is lower than 5 mg / L, no pretreatment is required; if the concentration of suspended solids in wastewater is 5-15 mg / L, pretreatment can be selectively carried out; If the concentration of suspended matter in the wastewater is higher than 15mg / L, it needs to be pretreated before entering the ion exchange resin device. Generally used pretreatment methods, according to the concentration of suspended solids in wastewater, choose different technical means or...

Embodiment 1

[0066] refer to figure 1 , In this embodiment, anion exchange resin, RO membrane and evaporative crystallizer are used to carry out resourceful comprehensive treatment of sodium sulfate-containing wastewater, and respectively realize potassium sulfate solid recovery, concentrated brine recovery and reclaimed water recovery.

[0067] Sodium sulfate containing wastewater water volume 100m 3 / h, the wastewater COD4 2- Content 4980mg / L, Cl - The content is 460mg / L, and the cation is mainly Na + , the wastewater contains a small amount of other ions, K + Content 24.5mg / L, Ca 2+ Content 348mg / L, Mg 2+ The content is 12.8mg / L, the total alkalinity content is 77mg / L, and other trace ions, such as fluoride, manganese, copper, iron, aluminum, silicon, etc., are industrial high-concentration brine with relatively complex components. The concentration of suspended solids in wastewater is less than 15mg / L, and there are no particulate impurities visible to the naked eye, so no pretre...

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Abstract

The invention relates to a resourceful treatment process of industrial high-concentration brine. The resourceful treatment process mainly comprises potassium sulfate solid preparation, sodium chloriderecovery and a water recovery technology. Firstly, sodium sulfate in the wastewater is converted into sodium chloride through an ion exchange resin device, then the sodium chloride is concentrated through a reverse osmosis membrane, permeate liquid can be reused in a production line, and trapped liquid is sodium chloride concentrated liquid and can be directly reused as desalted water; then the ion exchange resin is regenerated by using a potassium chloride solution, regenerated effluent is a high-concentration potassium sulfate solution and contains a small amount of potassium chloride, theregenerated effluent can be directly subjected to evaporative crystallization to obtain a potassium sulfate solid, and potassium chloride in crystallization mother liquor can be recycled as regenerated liquid. Compared with the prior art, the treatment process has the advantages that high-recovery-value potassium sulfate solids rather than sodium sulfate solids can be obtained while water and sodium chloride are recycled, resource recovery is achieved to the maximum extent in the whole process, and the treatment process is a sodium sulfate wastewater resource utilization technology with highereconomic benefits.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a resource treatment process for industrial high-concentration brine. Background technique [0002] Sodium sulfate is a necessary basic chemical raw material in the chemical industry, usually used in washing, bleaching and dyeing, papermaking, glass, leather, synthetic fiber, ink, rubber, organic chemical industry and other industries. The widespread use of sodium sulfate in industry has resulted in a large amount of sodium sulfate-containing wastewater, such as printing and dyeing wastewater, viscose wastewater, and papermaking wastewater in the textile industry. In addition, thermal power plants and coal chemical wastewater also contain high concentrations of sodium sulfate. Sodium sulfate in wastewater not only cannot be degraded by traditional biochemical systems, but also affects the growth and reproduction of microorganisms, and high concentrations may even kill microorgani...

Claims

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Application Information

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IPC IPC(8): C02F1/42C02F9/04C02F9/10C01D5/16C01D5/00C01D3/06
CPCC02F1/42C02F1/441C02F1/442C02F9/00C01D5/00C01D5/16C01D3/06C02F2001/422C02F2303/16C02F1/048
Inventor 葛文越杨飞李华
Owner SHANGHAI KAIXIN ISOLATION TECH CO LTD
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