Coking wastewater zero-discharge salt separation treatment system and method

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...

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

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