How to properly solve the problem of high salt wastewater treatment

High voltage electrostatic circulating water manufacturers to explain to you, how to properly solve the problem of high salt wastewater treatment.

1. Electrolysis. It can effectively reduce COD in wastewater, has strong adaptability to high salt wastewater, and has good removal effect, but its disadvantage is high operation cost.

2. Ion exchange method. It can be used as a treatment process to remove all kinds of metal ions to achieve the purpose of effective desalination, but its disadvantage is that the solid suspended solids in the wastewater will block the resin, so that the ion exchange resin will lose its effect.

3. Biochemical treatment. It has the advantages of economy and harmlessness, but the inorganic salt in high salt wastewater has strong inhibitory effect on microorganisms, so domestication of salt tolerant microorganisms is the key and difficult point of biochemical treatment method.

4. Concentration method. The membrane method and the evaporation method are included. Membrane concentration method has the advantages of low energy consumption, strong adaptability and good selectivity, but the filter membrane is easy to be blocked and corroded by substances in high salt wastewater, which needs to be cleaned or replaced frequently.

5. Evaporation method. The method of heating is used to vaporize the water in the high salt wastewater, so that the high salt wastewater can be concentrated and reduced. Generally, multi effect evaporation process and MVR evaporation process are used.

Zero discharge technology of high salinity wastewater:

After concentrated treatment, the high salinity wastewater has higher salt content, more difficult to treat, and worse impact on the environment after discharge. Therefore, in order to solve the problem of high salt wastewater treatment, based on the evaporation and concentration technology, the high salt wastewater is evaporated and crystallized, that is, the soluble salts in the high salt wastewater are separated to form crystalline salt compounds.

The crystallization process includes cooling crystallization and thermal crystallization, in which cooling crystallization is the basis of thermal crystallization. In the cooling crystallization process, the mother liquor separated by cooling crystallization after evaporation and concentration needs to return to the front end repeatedly for reheating evaporation concentration, which has the advantages of long process flow, high energy consumption and low efficiency. The hot crystallization process is to introduce special equipment to continue to heat and concentrate the concentrated mother liquor to form supersaturated solution, and then conduct cooling crystallization. The process can realize 100% separation of salt substances.

There are a lot of high salinity wastewater treatment methods, now give you a brief introduction of these several, according to the above high salinity wastewater treatment methods comparative analysis, we can see the advantages and disadvantages of various high salinity wastewater treatment methods. In the process of practical application, in order to achieve zero discharge of high salinity wastewater, we should according to the quality and quantity of wastewater, the requirements for water during water discharge, the economic value of waste recovery, the characteristics of treatment methods, and then through investigation and research, scientific experiments, and according to the indicators of wastewater discharge, regional situation and technical feasibility.