Comprehensive prevention and control method of electrodialysis membrane pollution for desalination of salty wastewater from coal chemical industry

A technology for salty wastewater and electrodialysis membranes, applied in chemical instruments and methods, separation methods, multi-stage water/sewage treatment, etc. , the effect of good membrane pollution control effect

Active Publication Date: 2016-01-20
JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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Problems solved by technology

Although these methods have a certain effect on the prevention and control of membrane fouling, due to the different properties of membrane fouling formed by different electrodialysis systems, they cannot completely solve the problem of membrane fouling in the electrodialysis system of coal chemical industry salty wastewater

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  • Comprehensive prevention and control method of electrodialysis membrane pollution for desalination of salty wastewater from coal chemical industry

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Embodiment 1

[0036] Example 1 Coal Chemical Industry Salt Wastewater Electrodialysis Desalination and Membrane Fouling

[0037] Coal chemical industry saline wastewater is desalinated by electrodialysis technology, using constant potential operation, concentrated water and fresh water are filtered with 5 μm PP cotton, and then directly used as water for the electrodialysis system. After 10 batches of continuous desalination experiments, it is found that with electrodialysis Carried out, similar to the simulated wastewater, under the same desalination conditions, the Cl- ion in the fresh water drops to less than 250mg / L to meet the reuse standard. However, in each batch of experiments, the current density showed a downward trend with the desalination process, and the downward trend of different batches was similar. The initial current density of different batches decreased slightly under constant potential. due to membrane fouling. Further dismantling the membrane stack, it was found that ...

Embodiment 2

[0039] Example 2 Membrane Fouling Prevention and Desalination Effect of Electrodialysis of Salt Wastewater in Coal Chemical Industry

[0040] For the water quality of coal chemical industry saline wastewater, the membrane pollution prevention and control methods adopted include: using high-efficiency coagulation, chemical precipitation, catalytic oxidation, multi-media filtration, membrane filtration and other unit technologies and their combinations to pre-remove the coal chemical industry saline wastewater Organic matter, microorganisms, colloids, suspended particles, Ca 2+ and Mg 2+ and other high-valent ions. Among them, COD drops from 100mg / L of raw water to about 20mg / L, and Ca 2+ , Mg 2+ The ion concentration is reduced to below 10mg / L, and the water filtered through the membrane is colorless, clear and transparent.

[0041] The high-efficiency coagulation uses KL-107 as a coagulant. The high-efficiency catalyst KL-CO3 used in the catalytic oxidation, or a composit...

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Abstract

The invention relates to a method for comprehensively preventing and controlling electrodialytic membrane pollution for desalination of coal chemical brine waste. The method comprises the following steps: (1) pre-removing organic matters, microbes, colloid, particle suspending matters, Ca<2+>, Mg<2+> and other high valence ions by utilizing the coupling and synergizing effects of a physic-chemical method and a membrane technology; (2) improving the anti-pollution performance of equipment by adopting an electrodialyzer for coal chemical brine waste; (3) controlling the application potential, solution flowing speed, temperature, concentrate pH and reversal cycle to run the electrodialysis below the limited current density; (4) carrying out online washing on membrane pollution formed by electrodialysis of coal chemical saline waste. The method is used for preventing and controlling the electrodialytic membrane pollution in the aspects of pre-removing pollutants, using specific electrodialyzer, optimizing the operation process, online washing membrane pollution and the like, which is to prevent and control membrane pollution formed when coal chemical saline waste is treated by electrodialysis by utilizing the synergetic effect of different technologies.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment technology, in particular to a comprehensive prevention and control method for electrodialysis membrane pollution used for desalination of salty wastewater in coal chemical industry. Background technique [0002] Coal chemical industry, iron and steel industry wastewater is treated by conventional physical and chemical methods, biological methods, etc., although it can meet the national and local wastewater discharge standards (COD<100mg / L, SS<60mg / L, pH6-9), but after the treatment reaches the standard Some organic matter, microorganisms, colloids, suspended particles, Ca 2+ and Mg 2+ and other high-priced ions, a large amount of soluble inorganic salts, etc., thus limiting its recycling, and directly discharging waste of water resources. With the increasing water consumption in industrial production and the increasing shortage of water resources, large water users in indust...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F1/469
CPCY02A20/124
Inventor 石绍渊曹宏斌李玉平盛宇星
Owner JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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