Decoloration method and system for electroplating wastewater

A technology for electroplating wastewater and wastewater, applied in metallurgical wastewater treatment, reduced water/sewage treatment, etc., can solve the problems of large dosage of chemicals, yellowing of effluent, and difficulty in decolorization, etc. land area effect

Active Publication Date: 2014-10-15
ZHEJIANG HI TECH ENVIRONMENTAL TECH
View PDF2 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The standard removal technology of heavy metal ions, cyanide and COD and other conventional pollutants has gradually matured. However, the problem of chromaticity of electroplating wastewater has been difficult to solve
At present, after the electroplating wastewater is treated by the previous process, the conventional detection indicators basically meet the standards, but the effluent will always turn yellow.
Moreover, it is difficult

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Decoloration method and system for electroplating wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 As shown, first prepare 20% sodium hydroxide aqueous solution in 1# dispensing barrel 6 of dispensing room 5. After sodium hydroxide is completely dissolved and cooled, NaBH is added 4 Configured to contain 10% NaBH 4 Solution; configure 5% NaHSO in 3# dispensing barrel 8 3 Aqueous solution; 2# dispensing barrel 7 is NaBH 4 / NaHSO 3 The reduction system is composed of 6 medicines and 8 medicines mixed according to the volume ratio of 1:50, and is prepared for immediate use. The medicine storage barrel 9 contains 20% dilute sulfuric acid; the medicine storage barrel 10 contains 30% liquid caustic soda solution. The yellow electroplating wastewater in the pre-treatment tank 1 (chromaticity is about 300 times) is pumped into 1# reaction tank 2 through the peristaltic pump 11. The flowmeter 12 and valve 13 are used to control the water inflow, and the agent in 7 is passed into 2 at the same time , Keep the ratio of the medicine to the inlet water flow at 1:1...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the field of wastewater treatment, and particularly discloses a decoloration method and system for electroplating wastewater. According to the method, a certain quantity of strong reducing agent systems NaBH4/NaHSO3 at certain proportions is added into final settlement tank effluent with a pH (potential of hydrogen) value of 7 in the electroplating wastewater, the mixture is uniformly stirred to stabilize the pH, a dilute sulphuric acid solution is added to adjust the pH to 7.0-8.0, wastewater containing resist salt is treated to be transparent and colorless in 1-10 minutes, and color reversion phenomenon is not caused during natural placement or after oxidizing agents such as sodium hypochlorite and the like are added. The treatment system based on the decoloration method for electroplating wastewater comprises a preparation chamber, a NO.1 reaction tank, a NO.2 reaction tank, a pH adjusting tank and the like, wherein the preparation chamber comprises a NaBH4 solution (containing 10%-40% of NaOH) preparation bucket, a NaHSO3 solution preparation bucket, a reaction system preparation bucket, a sulfuric acid storage bucket and a liquid caustic soda storage bucket. The method and the system have the characteristics of high electroplating wastewater decoloration efficiency, low probability of color reversion and the like.

Description

Technical field [0001] The invention relates to a decolorization treatment technology for electroplating wastewater, in particular to a method and system for decolorizing electroplating wastewater containing anti-dyeing salts. Background technique [0002] The composition of electroplating sewage is complex, which mainly comes from pre-treatment sewage of plating parts, coating rinsing water, post-plating treatment sewage and electroplating waste liquid. According to its pollutant characteristics, it can be divided into pre-treatment oily sewage, chromium-containing sewage, cyanide-containing sewage, other heavy metal-containing sewage, and acid-base sewage. Electroplating rinsing sewage usually contains cyanide, hexavalent chromium, copper, nickel, zinc and other toxic substances. If it is discharged without treatment or only after simple treatment, it will pose a great threat to the environment. [0003] At this stage, as our country pays more and more attention to environmenta...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C02F1/70C02F103/16
Inventor 楼洪海吴勇民陈新才钱波金素素刘伟
Owner ZHEJIANG HI TECH ENVIRONMENTAL TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap