Efficient electrodialysis desalinizing device and method for coking wastewater

A coking wastewater and desalination device technology, applied in chemical instruments and methods, separation methods, general water supply saving, etc., can solve the problems of long-term stable operation of the system, low recovery rate of fresh water, large discharge of concentrated water, etc., and achieve the goal of promoting the project The effect of chemical application, high recovery rate of fresh water, and small discharge of concentrated water

Active Publication Date: 2015-04-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0019] The purpose of the present invention is to provide a high-efficiency electrodialysis desalination device and method for coking wastewater, to solve the problem of low fresh water recovery rate, low desalination efficiency, and concentrated water discharge when conventional membrane t

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  • Efficient electrodialysis desalinizing device and method for coking wastewater

Examples

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Example Embodiment

[0037] Example 1 High-efficiency electrodialysis desalination of simulated treatment of coking wastewater discharged outside the standard

[0038] A high-efficiency electrodialysis device was used to desalinate simulated coking wastewater, and the effects of different initial Cl- ions in concentrated water and fresh water on the desalination rate, energy consumption and membrane stack voltage were investigated. Studies have shown that when the initial concentration of Cl- in fresh water is 600 mg / L and the initial concentration of concentrated water is 1200, 5000 and 8000 mg / L, under constant pressure conditions, the resistance increases as the salt content of fresh water decreases , Can lead to a decrease in current density. After a certain period of treatment, the concentration of Cl- ions in the fresh water can be reduced to less than 250 mg / L. When the concentration gradient between concentrated water and fresh water is large, it will cause ion back diffusion; the current eff...

Example Embodiment

[0039] Example 2 High-efficiency electrodialysis desalination of coking wastewater discharged outside the standard

[0040] Although coking wastewater is treated by conventional physicochemical, biological and membrane technologies, although it reaches the efflux standard, its recycling is restricted due to the inclusion of inorganic salts such as Cl- ions, a small amount of refractory organic matter, suspended particulate matter and bacteria, etc., and further removal of Cl-, etc. Inorganic ions and other pollutants. This kind of wastewater discharged outside the standard is filtered with 5μm PP cotton before entering the electrodialysis system for desalination, using constant potential operation. After 10 batches of continuous desalination experiments, it was found that under the same desalination conditions, Cl- ions in fresh water dropped to less than 250mg / L to reach the reuse standard. However, in each batch of experiments, the current density showed a downward trend as th...

Example Embodiment

[0041] Example 3 Pilot study on high-efficiency electrodialysis desalination of coking wastewater discharged outside the standard

[0042] The high-efficiency electrodialysis device of the present invention is used to conduct a pilot study on the desalination of coking wastewater discharged outside the standard, and a high-efficiency electrodialysis desalination system is constructed. The results show that the device of the present invention is used to treat high-salinity wastewater from coal chemical industry. After 6-stage continuous desalination of fresh water, the desalination rate of coking wastewater can be over 90%, and the content of Cl- ions in the fresh water is less than 150 mg / L (satisfying Industrial reuse water standard), the fresh water recovery rate is over 85%; the concentrated water concentration multiple is greater than 10 times, the concentrated water discharge is less than 85%, and the COD does not increase, meeting the industrial wastewater discharge standard...

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Abstract

The invention relates to an efficient electrodialysis desalinizing device and method for coking wastewater. The device comprises a modified low-permeability anti-pollution ion exchange membrane, a corrosion-resistant titanium-based coating electrode with a low hydrogen and oxygen evolution overpotential, a waterproof and leakage-proof electric partition plate and an electrodialysis process control system for desalinizing coking wastewater, which are systematically integrated and optimized to construct an efficient electrodialysis device for desalinizing the coking wastewater. The method comprises the following step of deeply treating and desalinizing the coking wastewater by the efficient electrodialysis device, wherein freshwater is subjected to multi-stage desalination, so that the pre-treated coking wastewater reaches industrial reclaimed water standards, and the recovery rate of freshwater is over 85%; after being circulated and concentrated, the discharge amount of the concentrated water is smaller than 15% and discharged after the standards are achieved, and the system is stably operated. According to the device and the method for efficiently desalinizing by electrodialysis for coking wastewater disclosed by the invention, the problems such as a low freshwater recovery rate, great concentrated water discharge amount, severe membrane pollution, difficult long-term stable operation, and the like in the process of treating the coking wastewater by the conventional membrane technology are solved, and the engineering application of the electrodialysis technology in deeply treating and desalinizing the coking wastewater can be promoted.

Description

technical field [0001] The invention relates to the field of coking wastewater desalination method and equipment, in particular, the invention relates to a high-efficiency electrodialysis desalination device and method for coking wastewater. Background technique [0002] Coking wastewater is wastewater generated during the process of coal coke, gas purification and coking product recovery. The wastewater discharge volume is large and the water quality is complex. In addition to inorganic pollutants such as ammonia, cyanide, and thiocyanate, it also contains phenol, oil, and naphthalene. , pyridine, quinoline, anthracene and other heterocyclic and polycyclic aromatic compounds (PAHs). This kind of wastewater is highly toxic and has "three causes" effects. Therefore, the massive discharge of coking wastewater not only causes serious pollution to the environment, but also directly threatens human health. [0003] Coking wastewater is mainly treated by a series of treatments s...

Claims

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Application Information

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IPC IPC(8): C02F1/469C02F9/14
CPCY02A20/124
Inventor 石绍渊曹宏斌李玉平盛宇星
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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