High-salt evaporation mother liquor resourceful treatment system and method

Abstract

The invention discloses a high-salt-content evaporation mother liquor resourceful treatment system and method, and belongs to the technical field of wastewater treatment. The system comprises an electrolysis device, a neutralization reaction device and an adsorption purification device; wherein the electrolysis device comprises a reaction box body with a liquid inlet pipe, a liquid outlet pipe anda sampling pipe, a positive plate and a negative plate are arranged in the reaction box body, and a reaction gas outlet is formed in the top of the reaction box body; wherein the neutralization reaction device comprises a reaction barrel, a liquid inlet pipe, a liquid outlet pipe, a dosing port and an exhaust port are arranged on the reaction barrel; an aeration pipe with an aeration head at thebottom is arranged in the middle of the reaction barrel, the adsorption purification device comprises an activated carbon column wrapped with a shell, a gas inlet pipe is arranged at the bottom of theshell, and a discharge pipe is arranged at the top of the shell; a reaction gas outlet of the electrolysis device is connected with an inlet of an aeration pipe of the neutralization reaction devicethrough a gas conveying pipeline with an air extractor, and an exhaust port of the neutralization reaction device is also connected with a gas inlet pipeline of the adsorption purification device through a gas conveying pipeline.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a system and method for recycling high-salt evaporation mother liquor. Background technique [0002] During the oil and gas development process, a large amount of high-salt gas production wastewater, fracturing wastewater and drilling wastewater will be produced. The salt content of these wastewaters can be as high as 10,000-150,000 mg / L, the COD can be as high as 2,000-50,000 mg / L, the ammonia nitrogen can be as high as 50-200 mg / L, the concentration of other pollutants is relatively high, and the water quality is quite complicated. [0003] For the treatment of these wastewater, most oil and gas fields adopt the method of reinjection, but in areas with very dense formations, reinjection is quite difficult. At present, chemical oxidation and other methods are mostly used for treatment, but with the strengthening of environmental management, many places...

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Problems solved by technology

[0005] In the prior art, such as the publication number CN107585938A, the Chinese invention patent document titled "System and Method for Recycling Denitrification Catalyst Regenerated Wastewater for Catalyst Recovery Process", discloses a denitrification catalyst regeneration wastewater for catalyst recovery process. The system and method, the system includes a coagulation sedimentation tank, a reverse osmosis concentration unit, a concentrated brine tank, a sodium sulfate electrolysis unit, and an evaporation crystallization unit; the present invention also provides the use of the above system to treat denitrification catalyst regeneration wastewater and recover acid, Alkaline method; according to the characteristics of waste water, the present invention designs the link of recycling acid and lye, which reduces the amount of waste water on the one hand, and on the other hand, the recovered acid and lye can be used in the denitrification catalyst recovery process , reducing the amount of chemicals used, realizing the effective combination of catalyst regeneration and recycling process, but this technical solution adopts a completely closed-loop design, which does not meet the problem of gas emissions that will inevitably occur in the actual treatment process, and this technical solution It is only suitable for the liquefaction treatment process, and it is not suitable for the treatment of the high-salt evaporation mother liquor in the gas field.

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