A high-salt wastewater advanced oxidation method, industrial waste salt resource treatment method and equipment

Abstract

The invention discloses an advanced oxidation method for high-salt wastewater, a method and equipment for recycling industrial waste salt, and belongs to the field of environmental protection. The advanced oxidation method for high-salt wastewater includes the step of degrading organic matter in high-salt wastewater by using a combination of ultraviolet radiation, hydrogen peroxide and persulfate to perform advanced oxidation simultaneously. According to the determination of the first-order kinetic constant k in different intervals and the removal rate of TOC in different stages at 25°C under normal pressure, different advanced oxidation conditions were set to maximize the reaction efficiency on the basis of reducing energy consumption. The above-mentioned high-salt wastewater advanced oxidation method is further used as a treatment method for industrial waste salt recycling. After being treated by the advanced oxidation unit of the present invention, the treated waste salt is used in the ion membrane caustic soda production process, which creates economic benefits for the enterprise and realizes resource utilization of the waste salt.

Description

technical field [0001] The invention belongs to the field of environmental protection, and more specifically relates to an advanced oxidation method of high-salt wastewater, a method and equipment for recycling industrial waste salt. Background technique [0002] Industrial waste salt refers to the by-product crystalline salts produced in industrial production. The annual output of waste salt in my country has exceeded 10 million tons. Chemical products, especially waste salt produced in the process of pesticide production contain a large amount of organic matter. If not handled properly, it will directly Leading to the pollution of surface water, groundwater and soil, the waste salt is traditionally landfilled after the harmless treatment by pyrolysis, resulting in a huge waste of resources; however, by degrading the high-salt wastewater and then reusing it In the process of treatment, it is often difficult to degrade the organic matter due to the high salt concentration in t...

AI Technical Summary

Problems solved by technology

[0002] Industrial waste salt refers to the by-product crystalline salts produced in industrial production. The annual output of waste salt in my country has exceeded 10 million tons. Chemical products, especially waste salt produced in the process of pesticide production contain a large amount of organic matter. If not handled properly, it will directly Leading to the pollution of surface water, groundwater and soil, the waste salt is traditionally landfilled after the harmless treatment by pyrolysis, resulting in a huge waste of resources; however, by degrading the high-salt wastewater and then reusing it In the process of treatment, it is often difficult to degrade the organic matter due to the high salt concentration in the wastewater.

[0003] The prior art of Chinese Patent Application Publication No. CN107185948A discloses a waste salt treatment technology using waste salt thermal desorption unit + evaporation crystallization unit as the main body. Waste salt is heated to 500-650°C under anaerobic conditions for dehydration (100-150°C), organic matter evaporation (150-380°C), cracking (380-600°C) and other reactions. Evaporation cannot actually solve the problem of organic pollutants, and there may also be a problem of air pollution. It is also difficult to completely degrade the organic matter by heating and cracking. The method in the prior art is difficult to effectively remove the organic matter in the waste salt.

The prior art of Chinese Patent Application Publication No. CN107321755A discloses a utilization process including waste salt feeding system, waste salt melting system, tail gas treatment system, molten salt cooling granulation system to treat waste water containing sodium chloride, although for waste salt The treatment effect is better, but it uses the high-temperature flue gas generated by natural gas combustion to burn and incinerate the organic matter in the waste salt during the rising process in the furnace. One is that the incineration of organic matter will cause exhaust gas pollution, and the other is that the treatment cost is high. The temperature is as high as 1200°C, making it difficult to apply it in the actual industry on a large scale

The prior art of Chinese Patent Application Publication No. CN108929708A discloses a combined process of anaerobic pyrolysis carbonization + carbonization particle removal + two-stage membrane acid-base production to treat wastewater containing sodium chloride. The steps for removing organic matter are: in the cracking stage, use The small molecular organics in the waste salt are gasified, and the aromatic ring organics are cracked into hydrogen, carbon monoxide and small molecular organics. The gas products obtained in the cracking stage are collected and sent to the RTO incinerator; the carbonization stage makes the remaining small part of the waste salt unable to be completely The cracked condensed ring substances are carbonized into activated carbon and retained in the residue. Although it has a certain treatment effect on waste salt, the operating cost is high. The waste salt after incineration is agglomerated, and some organic matter remains in the waste salt due to insufficient incineration. In practical application, due to the high chloride ion content of waste salt, when this kind of waste salt is processed in the incineration device, the equipment will be corroded, and the final equipment will be scrapped from time to time. Therefore, simple incineration It is difficult for the waste salt treated by the method to meet the requirements of resource utilization

However, in this prior art, the oxidation efficiency in the treatment step of the advanced oxidation unit still needs to be further improved

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