Method for recovering organic effluent brine

Abstract

The invention discloses a method for recovering organic effluent brine. The method comprises the following steps: introducing organic effluent brine containing inorganic salts and organic matter into a prefiltration system, an evaporation crystallization system and a dry-method high temperature oxidation reaction system, after filtration, evaporation, and oxidation treatment, allowing the obtained inorganic salt product to be dissolved to become saturated brine, wherein the total organic carbon TOC is less than 10 ppm. With the method of the invention, more than 90% of water and inorganic salts can be recovered, and the zero discharge standard for waste water is basically reached; the recovery rate for the recycling of organic effluent brine is effectively increased; and great benefits are generated for environment protection and resource recovery; additionally, the obtained inorganic salt product can be used as an industrial raw material for recycling in ionic membrane electrolytic devices.

Description

technical field [0001] The invention relates to a treatment method for industrial waste brine, in particular to a method for recycling industrial organic waste brine. Background technique [0002] In the process of chemical product production and pharmaceutical production, besides the required products, waste water containing organic matter and high salt content is often produced after the reaction is completed. Generally, the organic matter in this type of waste water will range from hundreds to Between tens of thousands, while the concentration of its inorganic salts such as sodium chloride, sodium sulfate or calcium chloride can range from 10% to more than 20%. Due to the high salt content of this type of wastewater, general biochemical treatment cannot degrade the organic matter in it by itself. The usual treatment methods are to reduce the concentration of organic matter by oxidation, flocculation or adsorption, ion exchange, membrane separation, etc., but due to the co...

AI Technical Summary

Problems solved by technology

The general water treatment technology cannot stably and effectively reduce this kind of organic high-salt wastewater to this level. Therefore, it is common to recycle and treat this kind of organic waste brine to make the organic content meet the requirements of the ion-exchange membrane caustic soda production process. the puzzle

[0003] Chinese patent CN 1745914C discloses a kind of processing method to hydrazine hydrate waste brine, but this method only reclaims its acetone and ammonia, does not handle brine; Disclosed in the processing method to hydrazine hydrate waste brine in CN1792825A, although adopt air blowing Deoxidation and oxidation, but can only reduce the ammonia and acetone in the waste brine to 30ppm, which cannot meet the standard of ion membrane electrolysis, resulting in the failure of the waste brine to be reused

[0004] Chinese patent ZL200710013817.2 discloses a method for continuously extracting polymethylene polyphenyl polyamines from brine. Since there is no follow-up advanced treatment of waste brine in this method, the content of organic matter (higher in TOC and TN values) in waste brine is relatively low. High, not suitable for the stringent requirements of the ion-exchange membrane electrolysis process on the content of organic matter in brine

[0005] Chinese patent ZL200710138065.2 discloses a method for the advanced treatment of waste brine produced in the production process of MDI. Due to the use of one-step conventional extraction treatment, the stripper consumes more steam and energy consumption. At the same time, due to Waste brine has a high content of organic matter before advanced treatment, and there are many defects in the advanced treatment process, such as the consumption of more oxidant, large amount of adsorbent, and high treatment cost.

[0006] In addition, Chinese patent CN101143753 discloses a method of oxidative aeration and adsorption for waste brine generated in MDI production, and Chinese patent application CN101665302A uses extraction, aeration, adsorption and other methods to treat waste brine, TOC can be less than 8ppm, and total nitrogen is less than 2.5ppm, but this process is complex and long, and a large amount of organic matter is blown into the atmosphere during the aeration process to affect the environment, and the high regeneration cost of extractant and adsorbent also reduces the practicability of this treatment method

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