Coal chemical salt-containing wastewater treatment system and method

A technology for salty wastewater and coal chemical industry. It is applied in the directions of oxidized water/sewage treatment, multi-stage water treatment, water/sewage treatment, etc. It can solve the problems of high energy consumption and poor environmental protection, and achieve rapid concentration and harmlessness. and the effect of resource disposal

Pending Publication Date: 2020-04-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a coal chemical industry saline wastewater treatment system a

Method used

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  • Coal chemical salt-containing wastewater treatment system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The saline wastewater A used in this example comes from the coal chemical process. The total solids dissolved in the saline wastewater A has a TDS of 4500 mg / L and a COD of 125 mg / L.

[0064] The saline wastewater A enters the pretreatment unit for treatment, removes the interfering substances in the saline wastewater through biological treatment and filtration, and obtains the pretreated saline wastewater, and the pretreated saline wastewater enters the membrane concentration unit II for treatment to obtain concentrated salt waste water and clean water. The TDS value of the total solids dissolved in water in the resulting concentrated salt wastewater is 35000mg / L, and the ion species in the concentrated salt wastewater is mainly Na + , SO 4 2- , Cl - .

[0065] Concentrated salt wastewater mixed with organic materials enters the supercritical water treatment unit together, enters the supercritical water treatment reactor after heat exchange, and reacts with the oxi...

Embodiment 2

[0069] The saline wastewater B used in this example comes from the coal chemical process. The total solids dissolved in the saline wastewater B has a TDS of 4000 mg / L and a COD of 150 mg / L.

[0070] The saline wastewater B enters the pretreatment unit for treatment, removes the interfering substances in the saline wastewater through biological treatment, chemical treatment and filtration, and obtains the pretreated saline wastewater, and the pretreated saline wastewater enters the membrane concentration unit for treatment to obtain Concentrated salt wastewater and clean water. The TDS value of the total solids dissolved in water in the resulting concentrated salt wastewater is 30000mg / L, and the ion species in the concentrated salt wastewater is mainly Na + , SO 4 2- , Cl - .

[0071] Concentrated salt wastewater mixed with co-oxidant enters supercritical water treatment unit together, enters supercritical water treatment reactor after heat exchange, reacts with oxidant un...

Embodiment 3

[0075] The saline wastewater A used in this example. The saline wastewater A enters the pretreatment unit for treatment, removes the interfering substances in the saline wastewater through biological treatment, chemical treatment and filtration, and obtains the pretreated saline wastewater, and the pretreated saline wastewater enters the membrane concentration unit II for treatment. Obtain concentrated salt wastewater and clear water. The TDS value of the total solids dissolved in water in the resulting concentrated salt wastewater is 35000mg / L, and the ion species in the concentrated salt wastewater is mainly Na + , SO 4 2- , Cl - .

[0076] Concentrated salt wastewater, materials containing organic matter and co-oxidant are mixed together into supercritical water treatment unit III, and then enter supercritical water treatment reactor after heat exchange, and react with oxidant under supercritical reaction conditions. The oxidant is air, and the The organic matter-conta...

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Abstract

The invention relates to a coal chemical salt-containing wastewater treatment system and a treatment method. The coal chemical salt-containing wastewater treatment system comprises a pretreatment unit, a membrane concentration unit, a supercritical water treatment unit and a crystallization and salt separation unit. The treatment method adopts the coal chemical salt-containing wastewater treatmentsystem to effectively treat coal chemical salt-containing wastewater. According to the system and the method provided by the invention, further rapid concentration of the concentrated salt wastewatercan be realized through a supercritical water treatment technology, and organic matters in the concentrated salt wastewater are thoroughly removed, so that not only is enough crystallization drivingforce provided for subsequent crystallization and salt separation, but also the influence of the organic matters is eliminated, and harmless and resourceful treatment of the salt-containing wastewaterin the coal chemical industry is realized.

Description

technical field [0001] The invention relates to the field of waste water treatment, more specifically, a system for treating salty waste water in coal chemical industry and a treatment method for salty waste water in coal chemical industry. Background technique [0002] In recent years, environmental protection laws and regulations have become increasingly stringent, especially since the release and implementation of the new national "Environmental Protection Law" in 2015, the development of the coal chemical industry has encountered severe challenges from water resources, environmental protection and greenhouse gas emission reduction. The current coal chemical industry is facing The main contradiction has gradually changed from technological issues to environmental protection issues, especially the environmental protection of water resources. Modern coal chemical industry wastewater can be divided into two categories according to the salt content: one is high-concentration ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F9/14C02F103/34
CPCC02F9/00C02F2301/08C02F1/44C02F1/72C02F1/001C02F3/00C02F1/442C02F1/441C02F1/445C02F1/4693C02F1/722C02F1/727C02F1/74C02F2103/34Y02A20/131
Inventor 崔佃淼张然刘艳芳王大川崔龙鹏
Owner CHINA PETROLEUM & CHEM CORP
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