What are the desalination processes for high-salt wastewater treatment? Editor Kang Jinghui will talk with you about the desalination processes for high-salt wastewater treatment?
1. Why does high-salt wastewater treatment require desalination treatment?
With the large amount of wastewater generated during the collection and processing of oil and natural gas , it is increasing year by year. These wastewaters not only contain organic pollutants , but also contain a large amount of Na, Cl, SO2 and other inorganic ions.
If this type of high-salt wastewater is directly discharged without treatment, it will damage the local ecological environment,. Conventional treatment processes require that the salt concentration of wastewater should not be too high, so desalination is the key to treating high-salt wastewater.
2. High-salt wastewater treatment desalination technology
At present, the desalination technology of high-salt wastewater mainly includes membrane concentration treatment process and thermal treatment process.
1. Membrane concentration treatment process
Membrane concentration treatment process uses a permeable membrane as the medium to achieve the production of fresh water and the further concentration of salt water under the action of pressure difference.
This process has the advantages of easy operation and low energy consumption, but highly concentrated brine may cause the risk of secondary pollution.
2. The thermal treatment process mainly includes evaporation crystallization process and partition cooling crystallization process.
The evaporation and crystallization process uses steam as the heating source to realize the evaporation, condensation and reuse of water and the crystallization of salt. Although this process can realize the reuse of fresh water, the large amount of wastewater treatment and high energy consumption make the treatment cost expensive. ;
Partitioned wall cooling crystallization process is mainly suitable for desalination of high-salt wastewater whose salt solubility changes significantly with temperature. Most of them use frozen brine as the cold source, and remove heat through partition cooling to achieve wastewater desalination.
This method has shortcomings such as high energy consumption, large thermal resistance, crystallization walls, and difficulty in temperature control.
3. Vacuum evaporation crystallization desalination technology
Aiming at the disadvantages of high-salt wastewater whose solubility changes significantly with temperature and the partition-type cooling crystallization process, vacuum evaporation crystallization desalination technology is proposed.
vacuum evaporation crystallization desalination technology uses the strong hygroscopicity of lithium bromide solution to promote the evaporation and cooling of high-salt wastewater to produce supersaturation under vacuum conditions to achieve wastewater desalination.
This process has the advantages of low energy consumption, fast cooling rate, no heat exchange surface in the equipment, and low degree of crystal wall attachment.
For high-salt wastewater desalination treatment process, choosing a suitable high-salt wastewater desalination treatment process is a better choice.
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