Resourceful treatment method for membrane filtration concentrated solution in coal chemical industry

A treatment method and technology for concentrated liquid, which are applied in chemical instruments and methods, oxidized water/sewage treatment, water/sewage treatment, etc., can solve the problem of poor biodegradability, high heavy metal ion content, and inability to achieve effective coal chemical membrane filtration concentrate handling issues

Pending Publication Date: 2021-05-07
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the membrane separation process will produce a certain amount of membrane filtration concentrate, which has high content of heavy metal ions, high concentration of refractory organic matter, poor biodegradability, and a large amount of miscellaneous salts (such as NaCl, Na 2 SO 4 , CaCl 2 ), it is very difficult to deal with
In the prior art, the evaporative crystallization method is often used to treat the concentrated solution of the coal chemical membrane filter. The evaporative crystallization method is to concentrate organic matter and high-salt components. Effective treatment of chemical membrane filter concentrate, and caused a waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this example, the concentrated liquid of reverse osmosis membrane filtration of a certain coal-based gas in Xinjiang is used as the processing object. Ca in the concentrate 2+ , Mg 2+ and total Si concentrations were 11.22mg / L, 3.62mg / L and 76.1mg / L, Cu 2+ 、Ni 2+ and total As concentration were 0.5mg / L, 0.4mg / L and 0.3mg / L, COD concentration was 157mg / L, TOC was 285mg / L, and pH value was 7.43.

[0041] The concentrate is processed as a resource, and the method is as follows:

[0042] (1) Introduce the reverse osmosis concentrated solution into the flocculation sedimentation tank, add CaO and MgO to it and stir for 10 minutes, then add PAC and PAM in turn and stir for 5 minutes respectively, and carry out the passivation reaction to obtain the passivation treatment solution. In the passivation reaction, CaO, The dosages of MgO, PAC and PAM are 75mg / L, 2300mg / L, 110mg / L and 2mg / L respectively;

[0043] Add Na to the passivation treatment solution 2 CO 3 Stir for...

Embodiment 2

[0050] In this embodiment, the concentrate of a coal liquefaction reverse osmosis membrane filter in Xinjiang is used as the processing object. Ca in the concentrate 2+ , Mg 2+ and total Si concentrations were 10.07mg / L, 2.45mg / L and 74.10mg / L, Cu 2+ 、Ni 2+ and total As concentrations were 0.6mg / L, 0.3mg / L and 0.3mg / L, COD concentration was 132mg / L, TOC was 210mg / L, and pH value was 7.98.

[0051] The concentrate is processed as a resource, and the method is as follows:

[0052] (1) Introduce the reverse osmosis concentrate into the flocculation sedimentation tank, first add CaO (80mg / L) and MgO (2400mg / L) to it and stir for 10min, then add PAC (110mg / L) and PAM (1.7mg / L) in turn ) were stirred for 5 min respectively to carry out a passivation reaction to obtain a passivation treatment solution;

[0053] Add Na to the passivation treatment solution 2 CO 3 (65mg / L) was stirred for 10min, then PAC (110mg / L) and PAM (2mg / L) were added successively therein and stirred for 5...

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Abstract

The invention provides a resourceful treatment method for a coal chemical membrane filtration concentrated solution, and relates to the technical field of sewage treatment. The method comprises the following steps: adding CaO, MgO, PAC and PAM into the coal chemical membrane filtration concentrated solution to carry out passivation reaction so as to obtain a passivation treatment solution, and then adding Na2CO3, PAC and PAM to carry out complexation reaction so as to obtain a complexation treatment solution; adding FeSO4 and Na2CO3 into the complexing treatment solution for a precipitation reaction, and obtaining a precipitation treatment solution; adjusting the pH value of the precipitation treatment liquid to 9-10, introducing mixed gas of ozone and air, performing catalytic ozonation under the catalytic action of the activated iron shavings, and performing catalytic ozonation effluent; and carrying out nanofiltration and evaporative crystallization on the ozone catalytic oxidation effluent to obtain sodium chloride crystals and sodium sulfate crystals. According to the method provided by the invention, the coal chemical membrane filtration concentrated solution can be effectively treated, hazardous waste reduction is realized, and separation and resource utilization of carnallite are realized.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for resourceful treatment of a coal chemical membrane filter concentrate. Background technique [0002] Coal chemical wastewater contains a large amount of pollutants. It is difficult to completely remove the pollutants in coal chemical wastewater by ordinary biochemical processes. Membrane separation technology is usually required for advanced treatment. However, the membrane separation process will produce a certain amount of membrane filtration concentrate, which has high content of heavy metal ions, high concentration of refractory organic matter, poor biodegradability, and a large amount of miscellaneous salts (such as NaCl, Na 2 SO 4 , CaCl 2 ), which is extremely difficult to deal with. In the prior art, the evaporative crystallization method is often used to treat the concentrated solution of the coal chemical membrane filter. The evaporative crystall...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01D3/06C01D5/00
CPCC02F9/00C01D3/06C01D5/00C02F1/58C02F1/5236C02F1/5245C02F1/56C02F1/62C02F5/02C02F1/66C02F1/78C02F1/725C02F1/442C02F2209/055C02F2209/08C02F2209/20C02F2209/10
Inventor 陈秀荣汪朔原孙小力令狐珊珊张心雨李秋月魏晓顾昊
Owner EAST CHINA UNIV OF SCI & TECH
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