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Process and system for recovering sodium sulfate from high-salt and high-COD wastewater in zero-discharge manner

A sodium sulfate, zero-discharge technology, applied in alkali metal sulfite/sulfate purification, multi-stage water treatment, water/sewage treatment and other directions, can solve the problem that sodium sulfate products cannot meet the requirements of Class I first-class products, and the system operation Instability, poor reliability of zero-emission and other problems, to achieve the effect of increasing the output of frozen thenardite, saving energy consumption, and improving anti-scaling

Inactive Publication Date: 2020-04-28
SHAANXI AEROSPACE ELECTROMECHANICAL ENVIRONMENTAL ENG DESIGNING INST CO LTD
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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of unstable operation of the existing system, poor reliability of zero discharge, strict water quality requirements of the system, fouling of the evaporator and corrosion of equipment in the system, and the inability of the sodium sulfate product salt to meet the requirements of Class I first-class products Therefore, a process and system for recovering sodium sulfate from high-salt and high-COD wastewater with zero discharge are provided

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  • Process and system for recovering sodium sulfate from high-salt and high-COD wastewater in zero-discharge manner
  • Process and system for recovering sodium sulfate from high-salt and high-COD wastewater in zero-discharge manner

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Embodiment Construction

[0068] Below in conjunction with accompanying drawing and specific embodiment content of the present invention is described in further detail:

[0069] Such as figure 1 Shown, a kind of high-salt high-COD waste water zero-discharge technology that reclaims sodium sulfate comprises the following steps:

[0070] S1. Preprocessing

[0071] Let the incoming water enter the pretreatment unit for pretreatment, remove scaling factors and sundries, and ensure that the hardness of the effluent is less than 150mg / L, and the turbidity of the effluent is less than 5;

[0072] Among them, the incoming water is wastewater containing sodium sulfate salt or concentrated solution of concentrated water after nanofiltration membrane treatment. Considering the economy of this system, the mass concentration of sodium sulfate is not less than 5%, and the influent water is not less than 10m 3 / h;

[0073] The pretreatment unit includes a high-density sedimentation tank and a V-shaped filter conne...

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Abstract

The invention provides a process and a system for recovering sodium sulfate from high-salt and high-COD wastewater in a zero-discharge manner, and solves the problems that an existing system is unstable in operation and poor in zero-discharge reliability and sodium sulfate product salt cannot meet the requirements of class I first-class products. The process sequentially comprises the following steps: pretreatment, precooling, freezing crystallization, primary centrifugation, melting, evaporative crystallization, secondary centrifugation and drying. The system comprises a pretreatment unit, aprecooling heat exchanger, a circulating freezing crystallization unit, a first centrifugal machine, a hot melting kettle, a circulating sodium sulfate evaporation crystallization unit, a nanofiltration unit, an advanced oxidation pond, a second centrifugal machine and a drying packaging unit.

Description

technical field [0001] The invention belongs to the technical field of waste water recovery, and in particular relates to a process and a system for recovering sodium sulfate from high-salt and high-COD waste water with zero discharge. Background technique [0002] The object of high-salt wastewater treatment is medium-low concentration saline wastewater. After chemical softening and clarification, multi-media filtration and other pretreatments, as well as "ultrafiltration + reverse osmosis" double-membrane advanced treatment and reuse, the remaining concentrated water in the system, the salt content Generally greater than 1%, it is characterized by complex components, high salt content, and high organic content. High-salt wastewater treatment generally adopts a three-unit treatment process of "chemical pretreatment unit + membrane concentration unit + evaporation crystallization unit". Chemical pretreatment is to effectively remove the fouling factors that affect the norma...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D5/16
CPCC01D5/16C02F1/04C02F1/22C02F1/38C02F1/442C02F9/00C02F2301/08
Inventor 许世峰张元高继荣吴永刚郭宏伟李亮刘强张浩飞周勃
Owner SHAANXI AEROSPACE ELECTROMECHANICAL ENVIRONMENTAL ENG DESIGNING INST CO LTD
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