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Zero discharge system of wastewater

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Summary

The zero discharge solution of industrial wastewater is a system engineering. First, in the project design stage or in the process of the factory operation, the process optimization in the factory is adopted and the water saving technology is adopted to improve the water efficiency and reduce the water consumption. After the full recovery and utilization of the wastewater from the reverse osmosis membrane (RO), electrodialysis (EDR), ultrafiltration (UF) and membrane reactor (MBR) technology, the remaining high salt wastewater is recovered by the evaporation process. After the high salt waste water is treated by evaporation process, 90%-95% can generally be recovered from the distilled water by-product with a salt content of 5-10mg/L. A small amount of concentrated slag can be further cured or buried by the mold or evaporation pond.


The core technology of evaporative zero emission solution is "continuous evaporation and crystallization separation technology containing brine". It is the most reliable and effective technology solution to deal with high salinity wastewater in the world. As the most energy-saving evaporation crystallization method, MVR evaporation technology is widely used in the wastewater zero row system. The zero drainage system designed by our company is not only the technology of mechanical compression recirculation evaporation. During the operation, only the energy consumed by the water, steam, and condensate water circulating and flowing water pumps, steam compressors, and control systems is consumed. The typical energy consumption is 30 to 50 degrees of electricity for the treatment of salt wastewater per ton.



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The core technology is "falling film mechanical vapor compression and recycle evaporation technology". Seed salt technology is one of the key technologies to ensure the efficient and reliable operation of the zero discharge system of wastewater and waste water.




Bright spot of the system

arraw.png  Falling film mechanical steam compression recirculation evaporation technology

1、the most reliable and effective technology solution to deal with high salinity wastewater in the world.

2、in the process of operation, there is no latent heat loss. During the operation, only the energy consumed by the water, steam, and condensate water circulating and flowing water pumps, steam compressors, and control systems is consumed in the operation.

3、evaporation of only 28 thousand calories or less of heat per kilogram of water. The efficiency of a single mechanical compression evaporator is theoretically equivalent to the 20 effect multi effect evaporation system.

4、the use of multi effect evaporation technology can improve efficiency, but multi effect evaporation increases the complexity of equipment investment and operation.

 

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arraw.png  Seed salt technology

1、The "crystal seed method" is based on calcium sulphate.

2、ensure that the zero discharge system of wastewater and wastewater is efficient, reliable and stable. 

3、the high salinity wastewater treated by evaporation technology is concentrated in the evaporator, when the evaporation process is far beyond the limit of saturation solubility. The salt content in the water is easily crystallized and attached to the surface of the heat exchange tube to form scaling, which affects the efficiency of the heat exchanger or plugging the heat exchanger when it is serious.

4、solved the scaling problem of evaporator heat exchanger tubes, and successfully applied to all kinds of salty industrial wastewater treatment.


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Scope of application

Applications include thermal power plants, coal industry, coal chemical industry, petrochemical industry, papermaking, metallurgy, municipal landfill leachate, oil sand mining and other industries.




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