Treatment methods for high-concentration saline wastewater. High-concentration saline wastewater is often encountered during wastewater treatment. What methods should be used to treat this type of high-concentration saline wastewater? Kang Jinghui Evaporator Editor will talk to you about the treatment methods for high-concentration saline wastewater.
1. Sources and characteristics of high-concentration saline wastewater
High-concentration saline wastewater mainly comes from industrial wastewater or domestic sewage. Wastewater with a salt content greater than 1% is high-salt wastewater. This type of wastewater will also contain more inorganic ions such as Cl-, SO42-, Na+, Ca2+, and also contains organic matter such as glycerol and medium and low carbon chains. In general, the composition of high-concentration saline wastewater is relatively complex, and it has a strong killing or inhibitory effect on microbial metabolism.
High-salt wastewater mainly involves chemical, petrochemical industries, as well as fine chemical industries such as pesticides, dyes and pharmaceutical intermediates. On the one hand, it mainly comes from the crystallization mother liquor, phase transfer mother liquor, etc. generated in the production process;
On the other hand, it is generated in the wastewater treatment process, such as centrifugal mother liquor during evaporation and desalination, RO concentrated water during membrane filtration, etc.
Its main characteristics are high salt content. Both crystallization mother liquor and centrifugal mother liquor are wastewaters with salt concentrations close to saturation, and the salt content of RO concentrated water is often greater than 30,000 mg/L. At the same time, the organic pollutants in high-salt wastewater are complex, difficult to biodegrade by conventional biochemical methods, and some wastewaters are biologically toxic, making treatment difficult.
2. Treatment methods for high-concentration salt-containing wastewater
1. Process flow of high-concentration salt-containing wastewater:
High-salt wastewater directly enters Kangjinghui evaporator. Under vacuum negative pressure conditions, the feed liquid boils and evaporates, the waste liquid is concentrated and reduced, COD is removed, the effluent is clear, and it can be discharged or reused up to the standard. The remaining concentrated liquid is further treated to obtain dry solid crystalline salt, realizing the effective separation of salt and water, thereby achieving zero emission.
2. Advantages of high-concentration salt-containing wastewater treatment system:
(1) Good treatment effect: waste liquid concentration reduction ratio is more than 90%, COD removal rate is as high as 99%, and dry solid crystalline salt can be obtained stably;
(2) Low energy consumption: treating 1 ton of wastewater consumes about 50 degrees of electricity, and only electricity is required for operation;
(3) Stable operation: the equipment operates stably and reliably, and can operate continuously for 7X24 hours;
(4) High degree of automation: Siemens PLC control module, Kang Jinghui cloud independent APP, remote monitoring, unmanned operation;
(5) Support customization: tailor-made solutions according to the customer's water quality and water quantity;
(6) One machine for multiple uses: Kang Jinghui evaporator has a wide range of applications. Within the scope of equipment evaporation technology, it can treat various oily wastewater and salty wastewater;
(7) Extremely low daily maintenance costs: All accessories of Kang Jinghui evaporator can be purchased on the market at any time, and the maintenance cost is extremely low.
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