Methods for treating high-salinity wastewater
Published Time:
2021-07-30
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Methods for treating high-salinity wastewater
1. Add alkali to the high-salinity water for chemical reaction, producing calcium carbonate and magnesium hydroxide, removing some precipitates and suspended solids, and then treating the high-salinity wastewater through a membrane device. The water produced by the membrane device can be adjusted to a suitable pH range by adding acidic substances, and then enter the membrane desalination device for desalination treatment.
2. The water produced by the nanofiltration membrane device is mainly sodium chloride solution. The sodium chloride solution enters the membrane concentration device for concentration. The fresh water after the device can be further recovered, and the remaining concentrated water can enter the weakly acidic cation bed to further weaken the water hardness. After the acidic cation bed, the water enters the decarbonization device for decarbonization operation. CO 2 After removal, the remaining water enters the evaporator, and evaporative crystallization forms sodium chloride crystalline salt. The dried salt can be used as industrial salt.
3. Most of the concentrated water produced by the nanofiltration membrane device is sodium sulfate solution, which is frozen and crystallized to form mirabilite. Mirabilite is obtained by thermal evaporation and crystallization of sodium sulfate. The treated mirabilite mother liquor continues to be reverse osmosis concentrated, and the water is reused. Then, the concentrated water is sent to an evaporative crystallization device or a flue gas evaporation or ash mixing treatment device.
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