Electroplating pretreatment waste water online reuse technology

Abstract

The invention discloses an electroplating pretreatment waste water online reuse technology. The technology comprises the following steps: 1, pretreatment cleaning water is collected; 2, the pH value of the obtained wastewater is adjusted to 8-9; 3, a quantitative amount of the wastewater is pumped into a sand filter through a pump, and the wastewater enters a carbon filter; 4, the wastewater is pumped into an ion exchange resin tank A, and then enters an ion exchange resin tank B; 5, metal ion removed wastewater flows into an MBR membrane system; 7, wastewater in an MBR produced water tank enters an NF membrane system through a pump; and 7, freshwater in an NF produced water tank enters an RO membrane system through a pump. The electroplating pretreatment waste water online reuse technology combines ion exchange with the MBR membrane system, the NF membrane system and the RO membrane system, so the cycle use of the wastewater is realized, the use amount of freshwater is reduced, the emission reduction purpose is reached, and the use amount of the freshwater is saved by 85%.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to an on-line recycling process of pretreatment wastewater before electroplating. Background technique [0002] Electroplating rinse-wtewater is the wastewater discharged during the cleaning process of the plated parts in the cleaning tank. It does not include flushing the floor and containers, as well as waste water and waste liquid such as running, running, dripping, and leaking. Electroplating is a process that uses electrochemical methods to decorate, protect and obtain certain new properties on metal and non-metal surfaces. In order to ensure the quality of electroplating products, the metal coating has a smooth and good appearance and is firmly bonded to the substrate. In combination, the dirt on the surface of the plated parts must be thoroughly cleaned before plating, and the attachment liquid on the surface of the plated parts must be cleaned after plating. Therefor...

AI Technical Summary

Problems solved by technology

Electroplating is a process that uses electrochemical methods to decorate, protect and obtain certain new properties on metal and non-metal surfaces. In order to ensure the quality of electroplating products, the metal coating has a smooth and good appearance and is firmly bonded to the substrate. In combination, the dirt on the surface of the plated parts must be thoroughly cleaned before plating, and the attachment liquid on the surface of the plated parts must be cleaned after plating. Therefore, a large amount of wastewater must be discharged in the general electroplating production process

[0003] Pre-treatment wastewater has high COD, high pH, ​​and high oil. For the treatment of electroplating pre-treatment cleaning wastewater, the current domestic traditional method is to discharge it into a sewage treatment station. After chemical precipitation, it enters subsequent biochemical treatment, and the wastewater that meets the standard is discharged into In the natural environment, this treatment method not only wastes water resources, but also wastes chemicals

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