Coking wastewater zero-discharge salt separation treatment system and method

A technology for coking wastewater and treatment systems, applied in natural water treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of heat dissipation, high investment costs, large energy consumption, etc., and achieve strong impact load resistance , strong anti-fouling ability, accelerated separation efficiency

Active Publication Date: 2022-06-24
BGT GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can only be optimized to a certain extent in hard removal and filtration, but it cannot separate the components of the concentrated coking wastewater to meet the needs of using coking wastewater to produce secondary industrial raw materials, especially the evaporation and crystallization still has the defect of high energy consumption
[0004]The current evaporative crystallization system can only process a single coking wastewater component each time, and cannot realize the simultaneous treatment of multiple coking wastewater components, especially in the process of impurity filtration Incomplete, incomplete separation of components and serious heat dissipation during the evaporation and crystallization process lead to low efficiency of the existing evaporation crystallization, resulting in poor timeliness of coking wastewater treatment, high investment costs and large energy consumption of the system

Method used

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  • Coking wastewater zero-discharge salt separation treatment system and method
  • Coking wastewater zero-discharge salt separation treatment system and method
  • Coking wastewater zero-discharge salt separation treatment system and method

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Embodiment 1

[0029] The present application provides a zero-discharge salt-separation treatment system for coking wastewater, which at least includes a pretreatment unit 1 , a concentration unit 2 , a separation unit 3 , a crystallization unit 4 and a preheating unit 5 .

[0030] According to a specific embodiment, the pretreatment unit 1 receives the coking wastewater and performs dehardening and filtration treatment on the coking wastewater. After the pretreatment is completed, the coking wastewater is directly transported to the concentration unit 2 for concentration treatment. The concentration unit 2 completes the concentration of the coking wastewater by drawing water, and sends the concentrated coking wastewater to the separation unit 3 for component separation treatment. The separation unit 3 constructs a nanofiltration separation unit 32 by setting a streamlined flow channel frame and forming a flow channel wall by wrapping the nanofiltration membrane around the flow channel frame....

Embodiment 2

[0057] The application also provides a zero-discharge salt-separation treatment method for coking wastewater, which at least comprises the following steps:

[0058] (1) Pretreatment: mainly remove hardness, silica, F-, CODcr and residual impurities in coking wastewater, eliminate the impact of impurities on membrane concentration and evaporative crystallization treatment, ensure the quality of crystalline salt, and reduce waste crystalline salt as much as possible quantity. To remove the hardness, most of the hardness is removed by the softening method of lime soda ash, and the remaining hardness is completely removed by the ion exchange method.

[0059] (2) Membrane concentration: mainly use two-stage membrane concentration to reduce water and increase the salt content of concentrated water; on this basis, use two-stage nanofiltration membrane to separate sodium sulfate and sodium chloride.

[0060] The weak acid cation bed effluent first enters the GTR3 medium-pressure memb...

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Abstract

The invention relates to a coking wastewater zero-discharge salt separation treatment system which at least comprises a pretreatment unit (1) capable of performing hardness removal and filtration on coking wastewater and a concentration unit (2) for performing water reduction and concentration on the pretreated coking wastewater, the separation unit (3) is provided with a streamline-shaped flow channel frame and forms a nanofiltration separation unit (32) in a manner of winding a nanofiltration membrane on the flow channel frame to form a flow channel wall, and a flow dividing module (321) is arranged in a flow channel of the nanofiltration separation unit (32) in a manner of changing the flow speed and hydraulic pressure of the coking wastewater; and the crystallization unit (4) can be used for treating filtrate and trapped fluid generated by separation of the separation unit (3) by adopting different evaporative crystallization processes so as to obtain crystal salts with different components. In addition, the invention also relates to a coking wastewater zero-discharge salt separation treatment method.

Description

technical field [0001] The invention relates to the technical field of coking wastewater treatment devices, in particular to a system and method for zero-discharge and salt-separation treatment of coking wastewater. Background technique [0002] The development of industrial industry has caused serious pollution to the water environment. In the traditional coking wastewater treatment process, the advanced treatment of coking wastewater generally uses the reverse osmosis membrane concentration treatment process for purification treatment, but the existing reverse osmosis membrane has high requirements for water inlet conditions, limited concentration ratio, low recovery rate, and concentrated liquid volume. The disadvantages of large volume, high dosing amount, unstable system operation and high cost of concentrate treatment, and tar substances in coking wastewater will bring irreversible fouling to the existing reverse osmosis membrane system, which makes the reverse osmosis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/36
CPCC02F9/00C02F1/04C02F1/001C02F1/442C02F2001/007C02F1/28C02F1/441C02F1/725C02F2103/365
Inventor 权思影元西方张普寨周辉
Owner BGT GRP CO LTD
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