Salt splitting resource utilization method of coking wastewater nanofiltration concentrated solution

Abstract

The invention discloses a salt splitting resource utilization method of a coking wastewater nanofiltration concentrated solution. The salt splitting resource utilization method of the coking wastewater nanofiltration concentrated solution comprises the steps that the coking wastewater nanofiltration concentrated solution enters an adjusting pool for adjustment with uniform mass and quantities, outlet water enters a high-density settling pond through a lifting water pump for realizing the removal of the hardness of the coking wastewater nanofiltration concentrated solution, the outlet water realizes most removal of residual suspended matters through a multi-media filter, and the outlet water enters a lifting pool and enters an ultrafiltration membrane filtration system through the lifting water pump and a booster water pump; ultrafiltration membrane produced water enters an ultrafiltration membrane produced water pool, then, the ultrafiltration membrane produced water enters a RO membrane system for concentration through a RO membrane raw water pump and a high-pressure pump, after RO concentrated water is removed organic matters through an electrocatalytic oxidation system, the outlet water enters a high-pressure nanofiltration salt splitting system; the high-pressure nanofiltration concentrated solution containing higher concentration SO4<2-> realizes output of sodium sulfate crystal salt separately through an MVR evaporated crystallization and freezing crystallization unit; and high-pressure ultrafiltration produced water containing higher concentration Cl<-> realizes output of sodium chloride crystal salt through a sodium chloride crystallizer.

Description

technical field [0001] The invention relates to the technical field of coking wastewater treatment, in particular to a salt separation and resource utilization method for nanofiltration concentrated liquid of coking wastewater. Background technique [0002] Coking wastewater is a typical toxic and refractory organic wastewater. It mainly comes from the production water and steam condensation waste water in the process of primary cooling of coke oven gas and coking production. Refers to the waste water produced in the process of coal coking, gas purification, chemical product recycling and chemical product refining. [0003] The concentration of pollutants in coking wastewater is high and difficult to degrade. Due to the presence of nitrogen in coking wastewater, the nitrogen source required for biological purification is excessive, which brings great difficulties to the treatment standard; the discharge of coking wastewater is large, and the water consumption per ton of cok...

AI Technical Summary

Problems solved by technology

According to the existing actual projects and pilot test conditions, under the premise of ensuring the quality of salt, the recovery rate is generally 50-60%, that is, about 40-50% of the salt can only be discharged as miscellaneous salt, not only It limits the recovery of salt, and also increases the amount of foreign salt, which cannot achieve the goal of separating salt, recovering salt and reducing solid waste

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