High-hardness salt-containing water concentration method based on monovalent cationic selective electrodialysis

An electrodialysis and cation technology, applied in separation methods, osmosis/dialysis water/sewage treatment, general water supply saving, etc., can solve the problems of complex equipment and low recovery rate, achieve high efficiency, good adaptability, and avoid scaling effect of the phenomenon

Active Publication Date: 2017-08-18
HEBEI UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the current high-salt industrial wastewater concentration treatment requirements, and the problems of complex equipment and low recovery rate in the prior art, and proposes a high-hard salt-containing wastewater concentration process and system based on monovalent selective cation electrodialysis. The system With chemical dehardening, reverse osmosis, and electrodialysis as the core, chemical precipitation is used to remove hardness ions in the sys

Method used

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  • High-hardness salt-containing water concentration method based on monovalent cationic selective electrodialysis
  • High-hardness salt-containing water concentration method based on monovalent cationic selective electrodialysis
  • High-hardness salt-containing water concentration method based on monovalent cationic selective electrodialysis

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Embodiment 1

[0038] The raw water in this part is the mixed water of wastewater from a chemical enterprise and the return water from each unit, and the water quality is shown in the table

[0039] Element concentration Na 2 SO 4 / mg·L -1

7 000 Ca 2+ / mg·L -1

20 Cl - / mg·L -1

36 COD / mg·L -1

3 000 SS / mg·L -1

50 pH 8.2

[0040] The first step, raw water pretreatment process

[0041] The above raw water 98.7m 3 / h, the SS value is removed by the mechanical clarifier, the anaerobic / aerobic (A / O) biological reaction tank, and the biological aerated filter (BAF) are used to remove COD in the water, and after ultrafiltration, the water produced is 88m 3 / h, TDS 7050mg / L, SS 0mg / L, COD 100mg / L, SDI value: 3. Among them, the ultrafiltration adopts PVDF hollow fiber membrane, adopts the form of cross-flow filtration, the recovery rate is 90%, and the operating pressure is 0.1MPa.

[0042] The second step, reverse osmos...

Embodiment 2

[0055] The raw water in this part is wastewater from an enterprise, with a water volume of 360m 3 / h, pH=7 water quality as shown in the table.

[0056] water quality index Valuemg / L K 50 Na +

1700 Mg 2+

100 NO 3 -

260 Cl -

1100 SO 4 2-

3800 total hardness 3000 TDS 8300 COD Cr

120

[0057] The first step, raw water pretreatment process

[0058] 360m from the raw water adjustment pool 3 / h flow rate and each part of return water enters the regulating pool, with a total water volume of 400m 3 / h into the ozone + BAF process, this process mainly removes COD in the water, the design removal rate is 40%, the COD of the produced water is 70mg / L, and the other indicators are basically unchanged; then add Na 2 CO 3 , coagulant FeCl 3 (mg / L) and coagulant PAM (mg / L) enter the high-density clarification tank to mainly remove hardness in raw water, the design removal rate is 95%, and part ...

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Abstract

The invention discloses a high-hardness salt-containing water concentration method based on monovalent cationic selective electrodialysis. The method comprises the following steps: 1, performing chemical precipitation hardness removal and pretreatment on raw water; 2, performing reverse osmosis desalination treatment; and 3, regulating the pH value of reverse osmosis concentrated saltwater with hydrochloric acid or sulfuric acid to be 4-6 so as to serve as raw electrodialysis water, and enabling the water to respectively enter a desalting chamber and a concentration chamber formed by an anode membrane and a cathode membrane at an interval in an electrodialysis membrane stack, thereby obtaining high-salt electrodialysis water and low-salt electrodialysis water. According to the method disclosed by the invention, extra equipment and devices are not needed, and two ions forming a scale forming matter are separated under the condition that the recovery rate is not changed, so that a scaling phenomenon caused by simultaneous interception or simultaneous permeation is avoided.

Description

technical field [0001] The technical solution of the invention relates to a high-hardness brine concentration process and system based on monovalent cation selective electrodialysis, which belongs to the field of wastewater treatment and environmental protection. Background technique [0002] The rapid development of social economy has driven the rapid development of enterprises, but the ensuing environmental problems, especially wastewater discharge, have become the bottleneck restricting the coordinated and sustainable development of economy, society and environment. Chemical, papermaking, printing and dyeing, leather and other industrial enterprises, on the one hand, because salt may be used as one of the raw materials in the process, on the other hand, the gradual concentration of salt in the process water makes the waste water have a high salt content. If it is not properly disposed of, it will inevitably Bring water and soil ecological environment pollution. Therefore...

Claims

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Application Information

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IPC IPC(8): C02F1/469C02F1/44
CPCC02F1/441C02F1/4693C02F2201/46Y02A20/124Y02A20/131
Inventor 袁俊生刘杰纪志永王军郭小甫赵颖颖谢英惠
Owner HEBEI UNIV OF TECH
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