What are the technical aspects of zero discharge salt separation for high salt wastewater? For high salt wastewater and high concentration saline water, in order to achieve zero discharge of wastewater, there are many technical requirements for zero discharge of high salt wastewater. At present, many companies are eager to achieve zero discharge of wastewater, while recycling and utilizing a lot of impurities to achieve solid waste reduction.

At this stage, thermal method and biological fiber facial mask are the key technologies for salt separation and salt separation process. In contrast, thermal method salt separation technology projects have slightly lower investment and lower operating costs, but the purity of sodium oxide crystal salt cannot meet the requirements of chlor alkali chemical industry. It must be adjusted when the water body fluctuates, and the actual operation difficulty coefficient is large.

So what are the technical aspects of zero discharge salt separation for high salt wastewater? Let's take a look at the zero discharge salt separation technology for high salt wastewater.

1. Salt and nitrate co production and salt crystallization process

When there is no dominant salt component in concentrated water, immediate evaporation crystallization technology is used to obtain pure salt with lower utilization efficiency and larger production of impurities. In this case, sodium nitrate and sodium oxide can be used to crystallize at higher temperatures to obtain sodium nitrate, and at lower temperatures to obtain sodium oxide.

2. Low temperature crystallization process

Because sodium nitrate crystallizes from the solution in the ultra-low temperature range, the key is to produce sodium sulfate decahydrate. Therefore, its solubility in the temperature range of 0-30 ℃ is completely different from that in the high temperature range. In this range, its solubility decreases with decreasing temperature, and the force is enormous.

3. Membrane separation technology process

The separation process of biological fiber facial mask is mainly the salt separation process of nanofiltration membrane. Because the membrane only separates the carbonate in two streams of aqueous solution, it can't make the carbonate crystal separate out, so it is usually used with the whole process of thermal crystallization to complete the salt separation crystallization.

Nanofiltration membranes with sodium oxide are generally extracted based on the entire membrane process or volatilization process, and then enter the volatilization crystallizer to obtain high-purity sodium oxide. A small amount of hydrolysis solution is dried to obtain impurities, because divalent salts are intercepted by the nanofiltration membrane, and the relative composition of sodium oxide in the liquid through the nanofiltration membrane is usually higher than 95%. Therefore, the utilization rate of this part of sodium oxide crystals is relatively high. The concentrated water of the nanofiltration membrane is a mixture of sodium oxide and sodium nitrate, and the occupancy rate of each component is related to the composition of the source water and the water utilization rate of the nanofiltration membrane module. Therefore, suitable thermal salt separation processes can be further selected to recycle and utilize the accumulated sodium nitrate in the concentrated water.

In the zero discharge technology of high salt wastewater, each has its own advantages and disadvantages. The nanofiltration membrane project has high investment and operating costs. With the change of operating time, the cleaning and replacement frequency is high, but the purity of salt separation is high, which can meet the salt separation detection standards.

The technical aspect of thermal salt crystallization is to use the concentration and solubility differences of different carbonates in wastewater, and to complete the separation of salts by manipulating suitable operating temperatures and extraction rates throughout the crystallization process. The key to salt crystallization in coal gasification wastewater is to use salt nitrate salt crystallization process and ultra-low temperature crystallization process. Mastering the zero discharge and salt separation technology of high salt wastewater can enable faster selection of suitable machinery and equipment for one's own products and wastewater treatment.

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