Method and device for resourceful treatment of industrial waste salt

Abstract

The invention relates to the field of environmental protection technology, and specifically discloses a method and device for recycling industrial waste salt, including (a) washing salt; (a1) performing the first floating washing; (a2) performing the first solid-liquid separation (a3) carry out floating washing for the second time; (a4) carry out solid-liquid separation for the second time; (a5) carry out floating washing for the third time; (a6) carry out solid-liquid separation for the third time; (a7) obtain cleaning after centrifugation (b) chemical salt; (b1) adding salt liquid from the bottom or bottom of the salt tank according to a suitable flow rate; (b2) making brine flow out from the overflow port on the upper part of the salt tank; (c) nanofiltration membrane treatment; ( d) catalytic oxidation treatment; (e) phosphorus removal flocculation; (f) sedimentation; (g) adsorption. The invention has the characteristics of being able to fully remove impurities in solid waste salt, without affecting the quality of the final refined brine, quickly controlling the concentration of brine to be qualified, and having high salt conversion efficiency and good salt conversion effect.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method and device for recycling industrial waste salt. Background technique [0002] With the increasingly strict environmental protection policies and the improvement of discharge standards, the requirements for industrial wastewater treatment technology are also getting higher and higher. Especially for high-salt organic wastewater as hazardous waste, the salt content of raw water is between 1.5 and 3%, COD is 5000-10000mg / L, ammonia nitrogen is above 200mg / L, up to 1000mg / L, and total phosphorus is 100mg / L. Above L, the maximum can reach 1000mg / L, and it also contains a certain amount of copper, nickel and other strictly controlled pollutants. This kind of wastewater has high salinity and COD concentration, and belongs to refractory industrial wastewater. Special technical means are required to ensure the discharge of effluent up to the standard. [0003] ...

AI Technical Summary

Problems solved by technology

However, the salt washing step is simply cleaned with a cleaning agent, which cannot fully remove the impurities in the solid waste salt, which will affect the subsequent treatment process and the quality of the final refined brine; the salt salt step is Adding pure water to the washed solid salt to dissolve it cannot quickly control the concentration of the salt solution to meet the requirements, the efficiency of the salt solution is low, and the effect of the salt solution is poor

[0006] Therefore, the existing treatment of high-salt organic wastewater cannot fully remove the impurities in the solid waste salt, which will affect the quality of the final refined brine, cannot quickly control the concentration of the brine to meet the requirements, the efficiency of the salt is low, and the salt less effective problem

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