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Coal chemical industry concentrated salt wastewater regeneration and recycling treatment method and system for implementing method

A treatment method, coal chemical technology, applied in the direction of energy wastewater treatment, water/sewage treatment, chemical instruments and methods, etc., can solve problems such as patent publications that have not yet been found, reduce scale and operating costs, and reduce the amount of high-concentration brine , to ensure the effect of stable operation

Active Publication Date: 2017-01-04
AEROSPACE ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Through the search, no patent publications related to the patent application of the present invention have been found

Method used

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  • Coal chemical industry concentrated salt wastewater regeneration and recycling treatment method and system for implementing method
  • Coal chemical industry concentrated salt wastewater regeneration and recycling treatment method and system for implementing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A kind of regeneration and reuse treatment method of concentrated salt waste water of coal chemical industry, the steps are as follows (the process flow diagram can be as follows: figure 1 shown):

[0046] (1) The concentrated salt wastewater produced by coal chemical industry is pressurized by a lift pump, and then passed through a multi-media filter to remove suspended solids. The specific operation requires that the inlet water is at room temperature and the inlet pressure is 0.1-0.6MPa, and then processed by an automatic sodium ion exchanger. , so that the hardness of the wastewater is lower than 0.03mmol / L, add 3-6ppm scale inhibitor to the outlet pipe of the automatic sodium ion exchanger, after passing through the security filter, and then pressurized by the nanofiltration booster pump to enter the nanofiltration separator The salt device intercepts high-value salts (mainly sodium sulfate) and small molecular organics, separates concentrated water (mainly sodium ...

Embodiment 2

[0061] A kind of regeneration and reuse treatment method of concentrated salt waste water of coal chemical industry, steps are all the same as embodiment 1 unless otherwise specified, and the difference is as follows:

[0062] (1) Multi-media filter

[0063]Concentrated salt wastewater (TDS: 10000mg / L, COD: 200mg / L, total hardness: 4mmol / L) produced after biochemical treatment and desalination of coal chemical production wastewater or clean water desalination enters the multi-media filter, and the inlet pressure is 0.1 MPa, to remove residual suspended matter (to protect the subsequent sodium ion exchanger), pressurize the effluent to 0.2MPa and send it to the fully automatic sodium ion filter;

[0064] (2) Fully automatic sodium ion exchanger

[0065] The fully automatic sodium ion exchanger adopts strong acid cation exchange resin, the inlet water is at room temperature and the pressure is 0.2MPa, so that the total hardness of the outlet water is 0.020mmol / L;

[0066] (3) ...

Embodiment 3

[0071] A method for regeneration and reuse of concentrated salt wastewater from coal chemical industry, the steps are the same as in Example 1 unless otherwise specified, the differences are as follows:

[0072] (1) Multi-media filter

[0073] Concentrated salt wastewater (TDS: 15000mg / L, COD: 250mg / L, total hardness: 6mmol / L) produced by biochemical treatment and desalination of coal chemical production wastewater or clean water desalination enters the multi-media filter, and the inlet pressure is 0.2 MPa, to remove residual suspended matter (to protect the subsequent sodium ion exchanger), pressurize the effluent to 0.3MPa and send it to the fully automatic sodium ion filter;

[0074] (2) Fully automatic sodium ion exchanger

[0075] The fully automatic sodium ion exchanger adopts strong acid cation exchange resin, the inlet water is at room temperature and the pressure is 0.3MPa, so that the total hardness of the outlet water is 0.025mmol / L;

[0076] (3) Nanofiltration sa...

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Abstract

The invention relates to a coal chemical industry concentrated salt wastewater regeneration and recycling treatment method which comprises the following steps: concentrated salt wastewater generated by coal chemical industry wastewater treatment enters a full-automatic sodium cation exchanger after flowing through a multimedia filter, and enters a nanofiltration salt separator through a cartridge filter to obtain concentrated water and produced water; the concentrated water and produced water respectively enter a first concentrator and a second concentrator; the diluted drawn solutions in the concentrators respectively enter a drawn solution regenerator, the drawn solution is recycled into the concentrators, the generated fresh water is treated by a membrane distillation device to remove residual ammonia and carbon dioxide, and the effluent water is recycled to the boiler to supplement water circularly; the sodium sulfate concentrated water generated by the first concentrator is subjected to impurity removal and sent to a freezing crystallization system to recycle the sodium sulfate crystal salt; and the sodium chloride concentrated water generated by the second concentrator is subjected to impurity removal, and is partially used as a regeneration solution of the full-automatic sodium cation exchanger and partially subjected to evaporative crystallization to recycle the sodium chloride. The method has the advantages of high recycling rate, investment saving, low energy consumption and simple technical process.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a concentrated brine regeneration and reuse treatment technology, in particular to a regeneration and reuse treatment method and an implementation system of the concentrated brine produced after advanced treatment and reuse of coal chemical wastewater. Background technique [0002] Coal chemical industry refers to the process of using coal as raw material and converting coal into gas, liquid and solid fuels or chemicals through chemical processing. It mainly includes coal gasification, liquefaction, dry distillation and tar processing. [0003] my country's coal resources are mainly concentrated in the junction of Shaanxi, Mengmeng and Ningxia in the middle and lower reaches of the Yellow River, Xinjiang, Shanxi, Gansu and other places. However, these places have fragile ecological environments and serious shortage of water resources, accounting for only about 21% ...

Claims

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Application Information

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IPC IPC(8): C02F9/10
CPCC02F9/00C02F1/001C02F1/42C02F1/22C02F1/445C02F1/447C02F1/442C02F5/08C02F2001/425Y02W10/37Y02P20/10Y02A20/131
Inventor 胡景丽李烁姚亮米星赵行张杰立黄虎成
Owner AEROSPACE ENVIRONMENTAL ENG
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