Application of evaporative crystallization technology in the zero-discharge field of coal chemical wastewater-Hezhong Environment (Beijing) Co., Ltd. was established in 2003

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Application of evaporative crystallization technology in the zero-discharge field of coal chemical wastewater

Published Time:

2021-05-27

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Application of Evaporation Crystallization Technology in Zero Liquid Discharge of Coal Chemical Wastewater

In the production of coal chemical enterprises, the discharge of high-salt wastewater is relatively large. Evaporation crystallization technology is generally used in the treatment of high-salt wastewater in coal chemical industry. Today, let's take a look at the application of evaporation crystallization technology in coal chemical industry zero liquid discharge application in the field.

The demand for water resources and pollutant discharge from coal chemical enterprises seriously affect the economic development of the region. In order to reduce pollutant discharge and protect the water environment, zero discharge of wastewater and recycling of water resources are required.

Overview of Evaporation Crystallization Technology:

Evaporation crystallization technology is applied to the treatment of high-salt wastewater in the coal chemical industry. The high-salt wastewater in the coal chemical industry mainly comes from coal gas washing wastewater, chemical water station drainage, circulating water system drainage, and other organic wastewater after biological treatment.

Common evaporation crystallization technologies in coal chemical industry zero liquid discharge are generally multi-effect evaporation technology and mechanical vapor recompression technology.

Multi-effect evaporation technology connects evaporators. The steam generated by the evaporator in the previous effect is used as the heat source for heating the evaporator in the next effect, so that the thermal energy is efficiently utilized. The pretreatment of the influent of multi-effect evaporation technology is relatively simple, and it can separate the non-volatile solvents and solutes in the wastewater, and will not leave a large amount of concentrated liquid, which is easy to treat after pyrolysis.

Mechanical vapor recompression technology uses the secondary steam in the evaporator, which is compressed by the compressor, and the temperature and pressure will increase, and the liquid material will remain boiling. The heating steam itself will condense into water. Through this method, steam can be used efficiently, the latent heat is recovered, the thermal efficiency is improved, the resource needs and energy consumption are reduced, and pollution is reduced.

Comparison of Multi-effect Evaporation Technology and Mechanical Vapor Recompression:

Compared with multi-effect evaporation technology, mechanical vapor recompression technology can fully utilize secondary steam and has obvious energy-saving effects. Multi-effect evaporation technology and mechanical vapor recompression technology each have their own advantages. Multi-effect evaporation technology is steam-electricity-determined, while mechanical vapor recompression technology is electricity-steam-determined. In order to achieve gas-electricity balance, the two can be organically combined.

Using evaporation crystallization technology to treat coal chemical wastewater can separate wastewater from salt. This treatment technology is a treatment process that can achieve zero liquid discharge of wastewater. The above is the application of evaporation crystallization technology in zero liquid discharge of coal chemical wastewater.