A stainless steel pickling wastewater treatment system and treatment method

Abstract

The invention relates to a stainless steel pickling wastewater treatment system and method. A grating device is connected with a regulation pool which is connected with a front filter. The front filter is connected with a first-stage agent adding pool. Closed-loop circulation is formed through the first-stage agent adding pool and a high-frequency pulse electric flocculation system which is connected with a first-stage sludge sedimentation pool. The first-stage sludge sedimentation pool is connected with a second-stage agent adding pool so that supernate of the first-stage sludge sedimentation pool can enter the second agent adding pool which is connected with a second-stage sludge sedimentation pool. A supernate outlet of the second-stage sludge sedimentation pool is connected with a sand filter tank. A sludge and water mixture outlet of the second-stage sludge sedimentation pool is connected with a bioleaching system. A water outlet of the sand filter tank is connected with a fluorine reduction device which is connected with an inclined zeolite bed. The inclined zeolite bed is connected with a discharged water collection pool. The bioleaching system is connected with a membrane distillation concentration system which is connected with an electrolysis system. The electrolysis system is connected with a nickel recovery device. By means of the stainless steel pickling wastewater treatment system and method, stainless steel pickling wastewater treatment can be achieved.

Description

Technical field: [0001] The invention relates to the field of industrial wastewater treatment, and more specifically relates to a stainless steel pickling wastewater treatment system and treatment method. Background technique: [0002] For a long time, the treatment of a large amount of pickling wastewater generated in the stainless steel production process has been a difficult problem for iron and steel enterprises. With the gradual development of the iron and steel industry, people have gradually realized that pickling wastewater is harmful to the environment, especially to humans. Stainless steel pickling wastewater is acidic wastewater containing Cr6+, Cr3+ and metal iron and nickel. When the iron-containing wastewater is discharged into the water body, the living conditions of fish, piscivorous animals and microorganisms participating in the self-purification of the water are destroyed due to the deprivation of oxygen from the water, resulting in the death of the fish. ...

AI Technical Summary

Problems solved by technology

Due to the strong toxicity of hexavalent chromium and its long-term stable existence, anti-seepage landfill cannot completely eliminate the potential danger of high-valent chromium to the environment, and landfill will increase the treatment cost and occupy valuable land resources

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