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

Method for processing electroplating waste containing Ni2+, Zn2+ and Cr3+

A technology for electroplating wastewater and treatment methods, which is applied in the fields of metallurgical wastewater treatment, water/sewage treatment, water/sludge/sewage treatment, etc. Increase the amount of mud and other problems to achieve the effect of self-purification

Inactive Publication Date: 2009-03-04
SHANGHAI UNIV
View PDF0 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, electroplating wastewater uses chemical precipitation methods such as hydroxides to remove heavy metal pollutants, and there are also the following limitations: (1) the pH values ​​at which the hydroxides of different metals reach the theoretical minimum solubility are different; (2) if the pH value of the solution deviates from the hydroxide The pH point of the minimum solubility will increase the tendency of hydroxide precipitation to dissolve again, unless the pH value is controlled in a narrow range, otherwise the highest removal rate cannot be achieved; (3) the chemical precipitation of calcium hydroxide and heavy metals will make The amount of heavy metal sludge is doubled, which increases the secondary cost of subsequent special treatment as hazardous waste

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 processing electroplating waste containing Ni2+, Zn2+ and Cr3+
  • Method for processing electroplating waste containing Ni2+, Zn2+ and Cr3+
  • Method for processing electroplating waste containing Ni2+, Zn2+ and Cr3+

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment one: the process and steps in this embodiment are as follows:

[0017] (1) Weigh a certain amount of Ni-containing 2+ , Zn 2+ 、Cr 3+ Dissolve electroplating wastewater and a certain amount of sodium hydroxide in water to form a solution; first add 50ml of deionized water to the reactor, and then put it in a constant temperature water pot at 60°C for heating; use a constant current pump to mix electroplating wastewater and hydrogen The sodium oxide solution is slowly transported into the reactor; the Ni in the wastewater 2+ , Zn 2+ 、Cr 3+ The ratio of the molar mass of heavy metal ions to the molar mass of sodium hydroxide is controlled at 1:1; at the same time, CO is delivered to the reactor 2 gas, and controlled at a pH of 8.5; during the reaction, use a booster electric stirrer to stir the reaction solution, and make the CO 2 The aeration volume is constant; after the electroplating wastewater reacts, stop feeding CO 2 , then accelerated the stirring...

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 relates to a processing method of electroplating wastewater containing Ni<2plus>, Zn<2plus> and Cr<3plus>, which belongs to the technology field of electroplating wastewater treatment and environmental protection engineering and has the characteristics that a Ni-Zn-Cr-LDH intercalation compound is promoted to be formed through controlling a certain reaction conditions by utilizing the accelerated carbonization technology to achieve that heavy metal ions are self-bound and stabilized and harmful heavy metals cannot be lixiviated, thereby protecting the environment. In addition, heavy metal infectants in an electroplating wastewater system are reduced through coprecipitation reaction, and are led to accord with wastewater discharge standard.

Description

technical field [0001] The invention relates to a Ni-containing 2+ , Zn 2+ 、Cr 3+ The invention relates to a method for treating electroplating wastewater, which belongs to the technical field of electroplating wastewater treatment and environmental protection engineering. Background technique [0002] The greenhouse effect is an important reason for man-made changes in the earth's climate, leading to the global heat crisis, and is a global environmental problem. Global climate change is closely related to energy. Among the various greenhouse gases that cause climate change, CO 2 The contribution rate accounts for more than 50%. Reducing greenhouse gas emissions and mitigating climate warming is an important goal of the "Kyoto Protocol" aimed at achieving sustainable development of the global ecological environment. The effective utilization of carbon dioxide resources produced in the emission reduction process is of great significance to the realization of circular econ...

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): C02F1/62C01G1/00C02F103/16
CPCY02P20/141
Inventor 白红梅钟丽芸仉博曾国盛任重钱光人
Owner SHANGHAI UNIV
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