Electroplating wastewater treatment process

Abstract

The invention discloses an electroplating wastewater treatment process. In the process, electroplating wastewater is concentrated by a reverse osmosis membrane. The process has the beneficial effects that the process is a physical process, does not need to inject medicaments, cannot generate phase change in the separation process and have lower energy consumption. In the separation process of the membrane, a substance is separated, another substance is concentrated, and the physicochemical properties of substances are not changed. Equipment is easy to operate, easily realizes the automation, can be operated under normal temperature and has wide use scope. No chemical medicament is added. No acid and alkali regeneration treatment, no chemical waste liquid, waste acid and waste alkali discharge, no acid and alkali neutralization treatment process are needed and no environmental pollution is realized; and a system is simple, is convenient to operate, has stable produced water quality and lowest energy consumption in various treatment methods. A separated nickel metal concentrate can be directly recovered to a plating tank for adding and using, not only cannot be wasted and but also can reduce the wastewater treatment cost; and separated clean water can be recovered to a rinsing water tank for cleaning, so that the water use cost is greatly reduced, and the sewage discharge expense is reduced.

Description

technical field [0001] The invention relates to an electroplating wastewater treatment process, in particular to a nickel electroplating solution wastewater treatment process. Background technique [0002] In the electroplating production, the nickel electroplating solution in the nickel rinsing tank was directly discharged to the waste water station in the past, and the waste water was treated and discharged after reaching the standard. This will not only increase the cost of waste water treatment, but also may cause environmental pollution due to incomplete treatment. The nickel metal treated by the waste water station often cannot continue to be recycled, which will also cause a lot of waste of resources and increase the cost of the enterprise. [0003] In addition to the treatment directly in the waste water station, the current common treatment method for nickel electroplating solution also includes an ion exchange method, but this ion exchange method has certain shortc...

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Problems solved by technology

[0002] In the past, the nickel plating solution in the nickel rinsing tank was directly discharged to the waste water station during electroplating production, and discharged after the waste water treatment reached the standard. This would not only increase the cost of waste water treatment, but also cause environmental pollution due to imperfect treatment.

And the nickel metal after being treated by the waste water station can't continue to be recycled, which will cause a lot of waste of resources and increase the cost of the enterprise.

[0003] In addition to the treatment directly in the waste water station, the current common treatment method for nickel electroplating solution also includes an ion exchange method, but this ion exchange method has certain shortcomings: 1) it uses the anion and cation resins to selectivity of anions and cations Adsorption is used to achieve the purpose of removing anions and cations in water. After the ion exchange resin is saturated, it must be regenerated with acid and alkali. The regenerated wastewater must be treated and discharged after passing the treatment. There is a hidden danger of environmental pollution; this will inevitably cause environmental pollution; 2) due to ion exchange There are many valves in the exchange bed, and the operation is complicated and cumbersome; 3) The automatic operation of the ion exchange method is difficult and the investment is high; 4) Bacteria are easy to multiply in the bed, and the ion exchange resin will permeate the organic matter into the pure water for a long time; 5) Nickel metal It cannot be returned to the plating tank for direct reuse, but can only be recycled, refined and reused, the process is cumbersome and the benefits are poor

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