Nickel-containing electroplating wastewater recycling treatment system and treatment method

Abstract

The invention provides a nickel-containing electroplating wastewater recycling treatment system and treatment method. The system includes an oil pollution and particle suspension removal system, an electrochemical oxidation system, a sedimentation basin, a biochemical system and a reverse osmosis system which are successively arranged according to wastewater treatment processes. Compared with traditional nickel-containing electroplating wastewater recycling treatment methods, the recycling treatment method of the system can reduce using dosage of drugs during treatment, so that treatment costscan be reduced, discharged sludge amount can be decreased, sludge outsourcing fees can be reduced for enterprises, and wastewater can be converted into purified water to be recycled. In addition, asthe system only discharges small amount of sludge without discharging the wastewater, environment loads can be significantly reduced.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a recovery and treatment system and a treatment method for nickel-containing electroplating wastewater. Background technique [0002] The treatment of nickel-containing electroplating wastewater is an important field of industrial wastewater treatment. The degree of removal of heavy metal nickel and whether water resources can be purified and utilized are the keys to the treatment of nickel-containing wastewater. [0003] At present, nickel-containing wastewater usually contains: nickel ions (Ni 2+ ): 1-500mg / L, trivalent chromium ion (Cr 3+ ): 1-100mg / L, total chromium content (Cr 6+ +Cr 3+ ): 10-100mg / L, copper ions (Cu 2+ ): 1-50mg / L, mineral oil content: 5-35mg / L; chemical oxygen demand (COD): 100-500mg / L, sulfate: 0-100mg / L, Ca 2+ +Mg 2+ : 0-100mg / L, pH: 2-3; these indicators are the key indicators of industrial wastewater discharge in the electroplating i...

AI Technical Summary

Problems solved by technology

In the traditional craft, Cr 6+ After being reduced by the added sodium pyrosulfite, quicklime is added to remove sodium sulfate and adjust the base. Since this treatment method will add a large amount of sodium pyrosulfite and quicklime to the wastewater, a large amount of sludge will be generated, which in turn will generate a large amount of sludge commission. The enterprise is miserable, and because a large amount of chemicals are added to the wastewater during the treatment process, these chemicals will poison the microorganisms in the subsequent biochemical system and affect the stability of the biochemical system

In addition, since a large amount of oil stains will remain on the surface of the workpiece during the electroplating process, these oil stains will increase the load on the subsequent biochemical system

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