At present, there are various methods for treating high salt wastewater in China, which are usually flexibly configured and optimized according to the specific composition, concentration, and treatment objectives of the wastewater. Here are some of the main methods for treating high salt wastewater:

          1、 Physical Law

          The physical method mainly targets the preliminary removal of suspended solids in high salt wastewater, and commonly used methods include grids, sedimentation tanks, etc. These methods can remove large suspended particles in wastewater and reduce the load on subsequent treatment processes.

          2、 Chemical method

          Chemical methods treat or recover dissolved or colloidal substances in wastewater through chemical reactions. Common methods include coagulation, neutralization, oxidation-reduction, ion exchange, etc. The chemical treatment method has good treatment effect, but the cost is relatively high, and it is usually used for further treatment after biochemical treatment. For example, the coagulation precipitation process is suitable for high salt wastewater with low COD concentration, which is pretreated by adjusting pH, adding coagulants and precipitants.

          3、 Biological Law

          Biological methods utilize the metabolic function of microorganisms to decompose and oxidize organic matter in wastewater into inorganic substances. Common biological methods include activated sludge method and biofilm method. The degree of biological treatment is relatively high, but high salt environments can inhibit microbial activity and affect the treatment effect. Therefore, the salt tolerant bacteria biochemical treatment method has emerged. This method has a lower cost, but requires strict water quality treatment and is greatly affected by organic matter in the wastewater.

          4、 Membrane separation method

          Membrane separation methods include reverse osmosis (RO), electrodialysis (ED), etc. These technologies achieve the separation of salt and water through specific membrane materials and techniques.

          Reverse osmosis: By utilizing the selective permeability of reverse osmosis membranes, salt and other pollutants in wastewater are trapped on one side of the membrane, thereby achieving desalination treatment of wastewater.

          Electrodialysis: Through the action of an electric field, ions in wastewater are separated and concentrated by passing through a semi permeable membrane under the force of the electric field.

          5、 Evaporation crystallization method

          The evaporation crystallization method uses evaporation to remove water from wastewater, causing salt crystals to precipitate, thereby achieving desalination treatment of wastewater. Common evaporation techniques include MVR evaporation and triple effect evaporator. These technologies can treat a large amount of high salt wastewater with low water quality requirements, but the operating costs are relatively high. The MVR evaporator reduces energy consumption and improves processing efficiency by recovering and reusing the steam generated during the evaporation process.

          6、 Deep processing and resource utilization

          Deep processing may involve advanced oxidation techniques and adsorption methods to further decompose organic pollutants. Finally, resource utilization includes the recovery of concentrated salt and its conversion into industrial salt or other uses.

          Advanced oxidation method: Using strong oxidants (such as ozone, hydrogen peroxide, etc.) under the action of catalysts, highly active free radicals are generated to oxidize organic matter and salts in wastewater into low toxicity or non-toxic substances.

          Adsorption method: Organic compounds in wastewater are adsorbed onto the surface of specific adsorption materials to reduce effluent COD. After adsorption saturation, specific desorption agents are used to desorb the adsorbent material, achieving regeneration of the adsorbent material.

          Resource utilization: Through crystallization technology, chemical precipitation method, biological method and other means, the salt and organic matter in high salt wastewater are converted into valuable resources. For example, separating salts such as sodium sulfate and sodium chloride from wastewater to obtain high-purity salt products; By adding chemical reagents, harmful substances in wastewater undergo chemical reactions to form precipitates, thereby achieving wastewater purification and resource recovery.

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