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System and technology for zero discharging of high-salinity wastewater

A high-salt wastewater and zero-discharge technology, which is applied in the direction of water pollutants, water/sewage treatment, heating water/sewage treatment, etc., can solve problems such as environmental hazards, strong corrosion of solidified materials, and high treatment costs, and achieve high efficiency, energy saving and zero discharge. Emission treatment, good running stability and simple operation

Inactive Publication Date: 2019-01-11
GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI +1
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Problems solved by technology

At present, the treatment methods of high-salt wastewater are mainly pretreatment technology, membrane separation and low-temperature multi-effect evaporation concentration to form a series of process combinations to complete the concentration and evaporation crystallization of high-salt wastewater, and the crystalline miscellaneous salt produced is treated as hazardous waste. Not only the processing cost is high, but also because the salt concentration in high brine is often very high, especially after concentration, its content will reach about 10%-20%, which contains relatively rich inorganic salt resources, resulting in waste of inorganic salt resources, However, if it is stacked for a long time, it may cause leaching of crystalline salt, pollute soil and groundwater, and is highly corrosive to solidified materials, posing a great environmental hazard
However, the recovery rate of membrane desalination technology based on reverse osmosis is only 75%, and 25% of the concentrated solution with higher salt content is discharged, and there is still the problem of serious membrane fouling

Method used

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  • System and technology for zero discharging of high-salinity wastewater

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Embodiment 1

[0046] see figure 1 The schematic diagram of the system structure is the zero-discharge system for high-salt wastewater of the present invention, including a pretreatment device 1, a nanofiltration device 2, a second low-temperature multi-effect distillation device 18, a dissolution and crystallization desalination device 17, a low-temperature crystallization separation device 16, a second A low-temperature multiple-effect distillation device 6, a mechanical vapor recompression forced circulation evaporator 19, and a refrigeration system.

[0047]The fluid inlet end of described nanofiltration device 2 is connected with described pretreatment device 1 pipeline; The outlet end of the product water of 2 is connected with the pipeline of the first low-temperature multiple-effect distillation device 6;

[0048] The second low-temperature multiple-effect distillation device 18 is sequentially connected with the elution crystallization desalination device 17 and the low-temperature...

Embodiment 2

[0065] The present invention also provides a zero-discharge treatment process for high-salt wastewater, the specific steps of which are as follows:

[0066] Step S1: pretreatment of high-salt wastewater: pretreat the high-salt wastewater to be treated, so that the effluent meets the water quality standard for nanofiltration membrane separation;

[0067] Step S2: nanofiltration treatment: the wastewater pretreated in step S1 is treated by a nanofiltration device to obtain concentrated water and nanofiltration product water;

[0068] Step S3: Processing of nanofiltration product:

[0069] (4) The concentrated water in step S2 absorbs heat through low-temperature multi-effect distillation, evaporates and concentrates, and obtains evaporated desalinated water and further concentrated water;

[0070] (5) In the further concentrated water that step (1) obtains, add dissolution agent, to reduce the solubility of sodium sulfate, and then separate out sodium sulfate; Dissolution cryst...

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Abstract

The invention discloses a system and a technology for zero discharging of high-salinity wastewater. A pre-processing system is adopted for removing hardness, basicity, heavy metal ions, COD, and the like, from high-salinity wastewater, so that the high-salinity wastewater can meet the water quality standard for nanofiltration membrane separation; nanofiltration is adopted for realizing the separation of divalent saline ions (SO42-), Na+, Cl and NO3-, and the like, in strong brine; the divalent saline ions (SO42-) exist in concentrated water; Na+, Cl and NO3- exist in generated water; a solventis added for reducing the solubility of sodium sulfate, so that high-purity sodium sulfate can be separated out; separation and recycling of desalted water and solvent are realized by crystallizing desalted water and keeping liquid state of solvent in the manner of cooling on the basis of the feature that the melting point of solvent is far lower than that of water. The system disclosed by the invention is simple in operation, high in running stability and capable of efficiently energy-saving realizing zero discharging of high-salinity wastewater.

Description

technical field [0001] The invention relates to the technical field of high-salt wastewater treatment, in particular to a system and process for zero discharge of high-salt wastewater. Background technique [0002] High-salt wastewater is one of the most difficult industrial wastewater to treat. It has the characteristics of high salt content, complex composition, easy scaling and corrosion, high concentration of organic matter and difficult to degrade. If it is directly discharged, it will inevitably have an extremely adverse impact on the environment, resulting in a serious waste of a large amount of water resources. How to treat high-salt wastewater with high efficiency and energy saving to achieve zero discharge, and at the same time recycle the inorganic salt resources in high-salt wastewater has become a major problem in the domestic environmental protection field. At present, the treatment methods of high-salt wastewater are mainly pretreatment technology, membrane s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/20
CPCC02F1/04C02F1/22C02F1/442C02F9/00C02F2101/20
Inventor 苏闯建张凤鸣陈顺权陈智宇陈久林莫明
Owner GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
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