Sucralose wastewater advanced treatment and desalination method

Abstract

The invention relates to a sucralose wastewater advanced treatment and desalination method. The method is characterized by comprising the following steps of: (1) adding ammonia water into wastewater to adjust the pH value to 6-7; (2) adding 10% of a composite settling agent, controlling the volume ratio of the settling agent to the wastewater at 1:18-23, and performing depositing for 1.5-2.5h to obtain a supernatant; (3) carrying out wet oxidation treatment on the wastewater at a temperature of 200DEG C-250DEG C under a pressure of 2.0-3.0Mpa, and remaining the state for 4-5h; (4) feeding thewastewater into MVR for evaporation and concentration, wherein the concentration ratio is 70-75%; (5) pumping a mother liquor into an evaporation kettle, performing evaporating and concentrating to obtain mother liquor, adding butanol or octanol, controlling the volume ratio of the mother liquor to the butanol or octanol at 1:1-4, and carrying out aerobic biochemical treatment on the supernatant;(6) cooling and crystallizing the mother liquor, and performing filtering to obtain a salt and alcohol; and (7) rectifying the alcohol to obtain a pure product. The method has the advantages that theuse amount of acid and alkali is greatly reduced; a relatively pure ammonium chloride salt is obtained; the mother liquor amount after alcohol extraction is reduced by 40 times compared with that of raw water, and the environmental protection pressure is greatly reduced.

Description

technical field [0001] The invention belongs to the field of chemical wastewater treatment and relates to a method for advanced treatment and desalination of sucralose wastewater. [0002] technical background [0003] Sucralose (TGS), a new type of sweetener jointly developed by Tate & Lyie and the University of London and applied for a patent in 1976, is the only functional sweetener with sucrose as raw material, the original brand name For Splenda, it is 600 times sweeter than sucrose. This sweetener has the characteristics of no energy, high sweetness, pure sweetness, and high safety. It is one of the best functional sweeteners at present. [0004] "Three high" wastewater refers to wastewater with high ammonia nitrogen value, high COD, and high salt content. In industrial production, wastewater with "three high" attributes comes from pharmaceutical, chemical, textile, paper and other industries. The composition of this type of wastewater is extremely complex and diffi...

AI Technical Summary

Problems solved by technology

With the promotion of the application of sucralose in the market, the demand in the market is getting bigger and bigger, which leads to the increasing scale of sucralose, and the waste water of sucralose has surged, causing a greater impact on the environment

Extraction wastewater in the production process of sucralose has complex components, high ammonia nitrogen value, high COD and high salt content, and it is extremely difficult to treat

When heating and concentrating, organic matter will be enriched on the salt, making the salt red and black, affecting the quality

Since sucralose wastewater contains many types of organic matter, using membranes to treat sucralose wastewater will cause the membrane to be polluted and cause membrane damage

[0007] Patent Publication No. CN108503115A - a method for advanced treatment and desalination of sucralose extraction wastewater. The method is to remove ammonia nitrogen by adding sodium hydroxide after coagulation and sedimentation, and then treat the wastewater by Fe-C micro-electrolysis and Fenton, and then concentrate and desalinate. technology, first of all, the ammonia nitrogen of the water sample is 7500~9000mg / l, a large amount of sodium hydroxide is needed to remove ammonia nitrogen, and the pH of the water must be guaranteed to be > 10, otherwise the effect of ammonia nitrogen removal is very poor, and then through Fe-C micro-electrolysis and Fenton , the optimal pH of Fe-C micro-electrolysis and Fenton reaction is 2~4, and the pH needs to be adjusted back to acidic, and then the pH needs to be adjusted back to neutral when the wastewater is evaporated and concentrated, thus producing a large amount of salt residue, and The salt is a miscellaneous salt, which is difficult to handle and increases a lot of operating costs

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