Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for recycling and processing ammonia-nitrogen-containing wastewater in circuit board etching waste liquor recycling industry

A technology for etching waste liquid and ammonia nitrogen waste water, which is applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Slow growth and other problems, to achieve the effect of enhancing gas-water separation efficiency, prolonging membrane hydrophilization time, and improving membrane hydrophobic performance

Active Publication Date: 2015-05-06
SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
View PDF3 Cites 27 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For high-concentration ammonia-nitrogen wastewater, it may be the most economical method to deal with it by stripping, and ammonia nitrogen can be recovered at the same time, but as the concentration of ammonia nitrogen decreases, its energy consumption increases, and at the same time, the recovery of ammonia nitrogen is difficult due to the decrease in concentration
The problem with the biological method is that due to the slow growth of nitrifying bacteria and the long reaction time required, the ammonia nitrogen load in the treatment process is low and the treatment facilities are huge
On the one hand, part of the crystallization mother liquor is always returned to the evaporation and concentration stage, resulting in more and more accumulation of impurities, and the obtained ammonium chloride product has a high impurity content; Low recovery rate

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
  • Method for recycling and processing ammonia-nitrogen-containing wastewater in circuit board etching waste liquor recycling industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In this embodiment, a method for resource utilization and treatment of ammonia nitrogen-containing wastewater in the circuit board etching waste liquid recovery industry is carried out as follows:

[0039] 1. Purification of sulfate: Add the waste liquid to be treated containing impurities such as ammonia nitrogen into the reaction tank, and add barium chloride solution into the reaction tank to make SO4 2- with Ba 2+ The molar ratio is 1:2, the temperature is controlled at 90°C, the reaction is 0.5h, and the filter aid FeCl is added 3 The rear inclined plate settles to remove the sediment;

[0040] 2. Purification of heavy metal ions: After adjusting the pH of the supernatant obtained in step 1 to be 4, use macroporous weakly acidic cationic resin D113 to adsorb barium ions and other heavy metal ions, and the flow rate is 6BV / h; after resin adsorption is saturated, use 6mol / L hydrochloric acid regeneration;

[0041] 3. Purification of organic matter: the pH of the f...

Embodiment 2

[0047] In this embodiment, a method for resource utilization and treatment of ammonia nitrogen-containing wastewater in the circuit board etching waste liquid recovery industry is carried out as follows:

[0048] 1. Purification of sulfate: Add the waste liquid to be treated containing impurities such as ammonia nitrogen into the reaction tank, and add barium chloride solution into the reaction tank to make SO4 2- with Ba 2+ The molar ratio is 1:1, the temperature is controlled at 80°C, the reaction is 1h, and the filter aid FeCl is added 3 The rear inclined plate settles to remove the sediment;

[0049] 2. Purification of heavy metal ions: After adjusting the pH of the supernatant obtained in step 1 to 5, use D403 to adsorb barium ions and other heavy metal ions; the commercially available resin is Na-type resin, and 8-10% hydrochloric acid needs to be converted into hydrogen-type resin, and then soaked with 10% ammonia water to convert the resin into ammonium resin; the fl...

Embodiment 3

[0056] In this embodiment, a method for resource utilization and treatment of ammonia nitrogen-containing wastewater in the circuit board etching waste liquid recovery industry is carried out as follows:

[0057] 1. Purification of sulfate: Add the waste liquid to be treated containing impurities such as ammonia nitrogen into the reaction tank, and add barium chloride solution into the reaction tank to make SO4 2- with Ba 2+ The molar ratio is 1:3, the temperature is controlled at 75°C, the reaction is 1.5h, and the filter aid FeCl is added 3 The rear inclined plate settles to remove the sediment;

[0058] 2. Purification of heavy metal ions: After adjusting the pH of the supernatant obtained in step 1 to 7, use weakly acidic macroporous cationic resin LSC-100 to adsorb barium ions and other heavy metal ions; commercially available resins are Na-type resins, and 8- 10% hydrochloric acid is converted into hydrogen-type resin, and then soaked with 10% ammonia water to convert ...

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 discloses a method for recycling and processing ammonia-nitrogen-containing wastewater in circuit board etching waste liquor recycling industry, relates to a regenerating method for ammonia-nitrogen-containing wastewater in circuit board etching waste liquor recycling industry, and aims to provide an ammonia-nitrogen-containing wastewater recycling method which is low in operation cost, high in ammonia-nitrogen pollutant eliminating rate and high in utilization rate. By adopting a combined mode of an impurity removal workshop section, MVR (melt volume flow rate) and a super-hydrophobic degassing membrane separation technology, heavy-metal-recycled ammonia-nitrogen-containing wastewater of the circuit board etching waste liquor is processed to obtain analytically pure ammonium chloride, and the ammonia-nitrogen content of the processed outlet water is not higher than 8mg / L. By recycling and performing up-to-standard processing on the ammonia-nitrogen-containing wastewater, the method can save the energy resources, can safely and effectively process high-concentration ammonia-nitrogen-containing hazardous wastes and can obtain a high-quality ammonium salt product. The method has the remarkable characteristics of recycling resources, being low in energy consumption, simple to operate, low in operation cost, convenient to manage, free of secondary pollution, high in ammonia-nitrogen pollutant reduction rate, high in utilization rate and the like.

Description

technical field [0001] The invention relates to a method for regenerating an etching composition, in particular to a method for regenerating ammonia-nitrogen-containing waste water in the circuit board etching waste liquid recovery industry. Background technique [0002] The circuit board industry is a typical industry with high energy consumption, high water consumption and high pollution. In the circuit board manufacturing process, a large amount of ammonia-containing etchant will be used, and a large amount of high-concentration etchant will be produced during the comprehensive treatment of circuit board etching waste liquid. Ammonia nitrogen wastewater. Ammonia nitrogen in wastewater mainly exists in the form of ammonium ions, which is the main substance of water eutrophication and environmental pollution. It is easy to cause a large number of algae and other microorganisms in water to multiply, and increase the cost of water supply treatment. In addition, ammonia is ox...

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): C02F9/10C01C1/16
Inventor 陈志传毛谙章彭娟宋传京李玉清田国元宋少华冯凡让赵陈冬马千里
Owner SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com