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Industrial brine resource utilization method and system

A concentrated brine and resource utilization technology, which is applied in the field of resource utilization of industrial concentrated brine, can solve the problems of large dosage and high cost of pretreatment chemicals, reduce the cost of dosing, reduce scaling problems, and improve the degree of resource utilization. Effect

Inactive Publication Date: 2018-12-25
国能朗新明环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of large dosage and high cost of pretreatment chemicals in the resource utilization process of industrial concentrated brine, the present invention provides a method and system for resource utilization of industrial concentrated brine, which reduces the cost of chemical addition in the pretreatment process

Method used

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  • Industrial brine resource utilization method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The composition of concentrated brine in a coal chemical enterprise is shown in Table 1, the main component is Na 2 SO 4 and NaCl.

[0026] Table 1 Water quality characteristics of concentrated brine in a coal chemical enterprise

[0027] project

quantity

pH

8-9

Na + (mg / L)

18130

K + (mg / L)

263

Ca 2+ (mg / L)

112

Mg 2+ (mg / L)

36

Cl - (mg / L)

15731

SO 4 2- (mg / L)

16713

HCO 3 - (mg / L)

95

TDS (mg / L)

49980

TOC (mg / L)

152

[0028] as attached figure 1 As shown, the steps of resource utilization of the concentrated brine are:

[0029] (1) Mix industrial concentrated brine and lye so that the pH of the mixed solution is 11.5, the lye is sodium hydroxide solution, and the volume ratio of concentrated brine to lye is 7:1;

[0030] (2) The mixed solution obtained in step (1) enters the microfiltration system to obtain microfiltration effl...

Embodiment 2

[0037] The composition of concentrated brine in a power plant is shown in Table 2, the main components are NaCl and NaCl 2 SO 4 .

[0038] Table 2 Water quality characteristics of concentrated brine in a power plant

[0039] project

quantity

pH

4-5

Na + (mg / L)

15520

K + (mg / L)

630

Ca 2+ (mg / L)

316

Mg 2+ (mg / L)

152

Cl - (mg / L)

11600

SO 4 2- (mg / L)

20800

TDS (mg / L)

49300

TOC (mg / L)

62

[0040] The steps of resource utilization of the concentrated brine are:

[0041] (1) Mix industrial concentrated brine with lye so that the pH of the mixed solution is 11.5, the lye is sodium hydroxide solution, and the volume ratio of concentrated brine to lye is 6:1;

[0042] (2) The mixed solution obtained in step (1) enters the microfiltration system to obtain microfiltration effluent;

[0043] (3) The microfiltration effluent of step (2) is adjusted to a pH valu...

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Abstract

The invention discloses an industrial brine resource utilization method and system. The industrial brine resource utilization method comprises mixing and homogenizing industrial brine and alkali liquor, regulating the pH to 11-12, removing precipitates from the mixed solution through a microfiltration system, regulating back the pH of microfiltration discharged solution, utilizing a nanofiltrationsystem to obtain a solution a mainly containing monovalent salt and a solution b mainly containing divalent salt, performing concentration and evaporative crystallization on the solution a through areverse osmosis system to obtain industrial sodium chloride, and performing resin exchange on the solution b to further remove calcium and magnesium ions for electrolysis to obtain alkali liquor and sulfuric acid solution, wherein the alkali liquor is returned for pH regulation of the industrial brine. According to the industrial brine resource utilization method, the monovalent salt solution obtained from nanofiltration salt separation is processed through reverse osmosis concentration and evaporative crystallization to produce the industrial sodium chloride, the divalent salt solution is electrolyzed, the alkali liquor produced through electrolysis returns to the softening pretreatment section of the industrial brine, so that the chemical adding cost of the pretreatment process can be greatly reduced; meanwhile, the entire process system of the industrial brine resource utilization method is skillful in design free from discharge of salt impurities; by recycling the alkali liquor produced during electrolysis, the chemical adding cost of the system can be reduced, and the degree of resource utilization of the industrial brine can be greatly improved.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of water resources, and in particular relates to a method and system for resource utilization of industrial concentrated brine. Background technique [0002] Wastewater from industries such as coal chemical industry, petrochemical industry, iron and steel, and electric power is usually reused by means of membrane concentration, which produces a large amount of concentrated brine, which contains a large amount of Mg 2+ , Ca 2+ , SO 4 2- and Cl - , direct discharge will cause a huge burden on the environment. At present, industrial concentrated brine mainly forms a series of process combinations through pretreatment, membrane treatment, natural evaporation and thermal evaporation technology to complete the concentration and evaporation crystallization of concentrated brine. Invention patent application 201610023871.4 discloses a zero-discharge membrane concentration process and equipmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D3/08
CPCC01D3/08C02F1/04C02F1/42C02F1/441C02F1/442C02F1/444C02F1/461C02F1/66C02F9/00C02F2201/007C02F2301/08
Inventor 苏双青赵焰徐志清陈文婷陆梦楠李向南陈雪杨东腾东玉
Owner 国能朗新明环保科技有限公司
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