Epichlorohydrin high-salt organic wastewater treatment technology

Epichlorohydrin, also known as epichlorohydrin, is a volatile and unstable liquid. The color of the liquid is not obvious. It is generally colorless and colorless liquid. Pure epichlorohydrin is the same color as the water. . It is slightly soluble in water, but also miscible with organic solvents. Epichlorohydrin is a basic chemical raw material and a fine chemical product with a wide range of uses.

Research status of high-salt organic wastewater

A large amount of organic wastewater will be produced in the production process of epichlorohydrin, and the content of alkali and salt in the organic wastewater is relatively high. By strengthening the treatment of high-salt organic wastewater with epichlorohydrin, the production cost of the enterprise can be reduced, and the economic benefit of the enterprise can be improved.

At present, in the treatment of high-salt organic wastewater, my country mainly adopts activated sludge treatment technology, ordinary activated sludge treatment technology, delayed aeration treatment technology, pure oxygen aeration treatment technology, and biofilm treatment technology. The reactors selected for the high-salt organic wastewater treatment process are generally membrane bioreactors (MBR), sequencing batch bioreactors, etc.

(1) Activated sludge treatment technology

As far as the activated sludge treatment technology is concerned, in the treatment process, the salinity will have a greater impact on the treatment effect. It can be seen that in the application of activated sludge treatment technology, only by domesticating activated sludge can the performance of organic matter in wastewater be better reduced. Wastewater treatment is very important.

(2) Biofilm treatment technology

The most notable feature of biofilm organic wastewater treatment technology is that it can fall off and renew the membrane by itself in an anaerobic environment. Impact resistance. As far as biofilm treatment technology is concerned, salinity has little effect on the treatment effect during its treatment process. Therefore, biofilm treatment technology is suitable for high salinity, unstable water quality, and toxic chemical wastewater treatment.

Epichlorohydrin high-salt organic wastewater treatment technology

Epichlorohydrin high-salt organic wastewater contains calcium chloride, calcium hydroxide, organic matter, etc. The use of such technologies for wastewater treatment is mostly concentrated in the sewage treatment plant system, and it is often mixed with other wastewater during treatment. As a result, the salt concentration in the wastewater changes, which affects the later treatment effect.

(1) Preparations before processing

In the process of epichlorohydrin high-salt organic wastewater treatment, since the wastewater contains many types of organic matter, solids, suspended solids, etc., various preparations must be implemented when the epichlorohydrin high-salt organic wastewater treatment operation is carried out. , After reaching the process treatment standard, the activated sludge treatment is carried out.

The preparation work includes: in the treatment of organic chlorides, a water-splitting method can be used to convert part of the chlorides into glycerol, and an aeration tower is used for pretreatment, mainly for the treatment of organic chlorides in wastewater. When dealing with solids and suspended solids in wastewater, in general, activated sludge treatment technology requires a treatment rate of 0.005% of suspended solids, and epichlorohydrin high-salt organic wastewater treatment technology requires a treatment rate of 0.5% of suspended solids. %, if there are many solids and suspended solids in the wastewater, it is necessary to adopt the sedimentation separation method or use a filter press to reduce the content of solids and suspended solids in the wastewater.

(2) Processing technology

In this epichlorohydrin high-salt organic wastewater treatment technology, it is necessary to use a wastewater treatment device to evaporate part of the wastewater. Under normal temperature and pressure, a magnetic stirring of the calcium chloride reaction liquid is carried out until the reaction liquid is evenly stirred, and then the reaction solution is heated until the heated temperature rises to the boiling point of water to promote the evaporation of water. After all, requirements are met, the heating is stopped immediately. Next, lower the temperature of the reaction solution by about 50°C of the original base, and finally add a sulfuric acid solution to the liquid with a concentration of 2 mol/L, so that the liquid can generate calcium sulfate.

After completing all the above operations, it is necessary to carry out the solution suction filtration, and then carry out the drying treatment operation, and the final product obtained is calcium sulfate powder. In this treatment, the epichlorohydrin wastewater filtrate belongs to the salt solution and the acid solution. According to the above analysis and description in this article, it can be known that the absorption rate of the experimental liquid is proportional to calcium sulfate. If the calcium chloride concentration in the liquid begins to increase and reaches a certain value, abnormal electromagnetic stirring will occur, and it is difficult to ensure the final It is difficult to ensure the sufficient reaction of each organic matter in the wastewater, resulting in a downward trend in the absorption rate of calcium sulfate.

Therefore, in this epichlorohydrin high-salt organic wastewater treatment technology, hydrogen chloride, hydrochloric acid water, etc., which are obtained as by-products of calcium sulfate, can be separated, or oxychlorination raw materials can be used. The produced oxychloropropane can be used as a raw material for caustic soda in a high-purity hydrochloric acid plant to replace chlorine and high-purity hydrochloric acid, so as to comprehensively increase the output of polyvinyl chloride in organic wastewater treatment. The low-concentration brine produced in the treatment of this paper may have an impact on the equipment during its production process, mainly due to corrosion, so it is difficult to improve the utilization rate of the equipment. In response to this kind of situation, high-concentration hydrogen chloride can be recovered and used in the production of hydrochloric acid. This hydrochloric acid is high-concentration hydrochloric acid. This kind of experimental method can effectively save chlorine gas, thereby improving economic benefits.

Due to the high salt content in epichlorohydrin wastewater and a large amount of wastewater, if it is treated separately, it will increase the difficulty of wastewater treatment and increase the cost of treatment technology. It is precise because of the large amount of wastewater that the waste of water resources is serious in the treatment process, and it is difficult to truly implement the conservation of water resources. From the perspective of water resources conservation and economy, with the assistance of the extraction system, the process wastewater in the dichloropropanol is separated from the dichloropropanol, and then the high-concentration calcium chloride is dried to produce dihydrate. Calcium chloride can be recycled on this basis. In turn, water resources can be saved, capital costs can be better saved, and the economic benefits of epichlorohydrin high-salt organic wastewater treatment can be comprehensively improved.

Conclusion

To sum up, with the intensification of urbanization construction and the rapid development of industrial construction in China, the problem of water pollution has gradually become prominent. Epichlorohydrin is an organic chemical raw material and has a very wide range of applications. A large amount of waste water will be generated in the middle of the process, which will have an impact on the surrounding environment. Therefore, it is necessary to increase the research on the treatment technology of epichlorohydrin high-salt organic wastewater, thoroughly implement the concept of green and environmental protection development in my country, and comprehensively improve the high-salt epichlorohydrin Economic benefits of organic wastewater treatment.

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