Treatment method of electroplating effluent containing heavy metal ions

A technology of heavy metal ions and electroplating waste liquid, applied in metallurgical wastewater treatment, alkali metal compounds, water/sewage treatment and other directions, can solve the problems of insufficient adsorption capacity, harm to the environment, large amount of consumption, etc., and achieve fast adsorption rate and process energy consumption. Low, good adsorption effect

Active Publication Date: 2016-07-13
浙江升阳再生资源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, chemical methods are still widely used in China to treat electroplating wastewater containing heavy metals. This method transfers heavy metals contained in wastewater to sludge. Not only expensive heavy metal resources cannot be recycled, but they will also become secondary pollutants and also endanger the environment.
In the context of the emergence of new environmental protection concepts and trends of thought, a large number of adsorbents are used in wastewater treatment, but the current commercially available adsorbents are not stable and have insufficient adsorption capacity, so they are used in large quantities when used in the treatment of electroplating waste liquid. , increasing the cost of water treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for treating waste electroplating solution containing heavy metal ions, comprising the following steps:

[0025] (1) Preparation of magnetic adsorbent:

[0026] (a) Dissolve 1 mol of 1,4,7-triazacyclononane-1,4,7-triacetic acid in 45 ml of biological buffer solution with a pH of 5.3-5.5, and add 10 mol of EDC·HCl and 5 mol of NHS as catalysts under nitrogen protection , stirred at room temperature for 1 h to obtain an activated intermediate of the azamacrocyclic carboxylic acid derivative;

[0027] (b) add 0.45gFe to the activation intermediate of the azamacrocyclic carboxylic acid derivative that step (a) makes 3 o 4 Magnetic nanoparticles as the core, SiO 2 In order to protect the shell, the shell contains particles with terminal amino structures. After ultrasonic dispersion, react at 25±5°C for 8 hours. After the reaction, use a magnet to separate the product, and wash the product alternately with 0.1mol / L HCl solution, ethanol and water. times, vacuum d...

Embodiment 2

[0031] (1) Preparation of magnetic adsorbent:

[0032] (a) Dissolve 1 mol of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid in 55 ml of biological buffer solution with a pH of 5.3-5.5, and add 40 mol of EDC under nitrogen protection. HCl and 15mol NHS are used as a catalyst, stirred at room temperature for 2 hours to obtain an activated intermediate of an azamacrocyclic carboxylic acid derivative;

[0033] (b) add 0.55gFe to the activation intermediate of the azamacrocyclic carboxylic acid derivative that step (a) makes 3 o 4 Magnetic nanoparticles as the core, SiO 2 In order to protect the shell layer, the shell layer contains particles with terminal amino structure. After ultrasonic dispersion, react at 25±5°C for 10 hours. After the reaction, use a magnet to separate the product, and wash the product with 0.1mol / L HCl solution, ethanol and water alternately. times, vacuum drying for 15h to obtain a magnetic adsorbent;

[0034] (2) The electroplating waste liqu...

Embodiment 3

[0037] (1) Preparation of magnetic adsorbent:

[0038] (a) Dissolve 1 mol of 1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetraacetic acid in 50 ml of biological buffer solution with a pH of 5.3-5.5, and add 20 mol of EDC under nitrogen protection. HCl and 7mol NHS were used as catalysts, and stirred at room temperature for 1.2h to obtain activated intermediates of azamacrocyclic carboxylic acid derivatives;

[0039] (b) add 0.48gFe to the activation intermediate of the azamacrocyclic carboxylic acid derivative that step (a) makes 3 o 4 Magnetic nanoparticles as the core, SiO 2 In order to protect the shell layer, the shell layer contains particles with terminal amino structure. After ultrasonic dispersion, react at 25±5°C for 8.5 hours. After the reaction, use a magnet to separate the product, and wash the product alternately with 0.1mol / L HCl solution, ethanol and water Several times, vacuum drying for 13 hours to obtain a magnetic adsorbent;

[0040] (2) The electroplatin...

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PUM

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Abstract

The invention discloses a treatment method of electroplating effluent containing heavy metal ions. The method comprises the following steps: firstly, performing standing pretreatment on the electroplating effluent, performing filtration, adding a flocculant and a coagulant aid, performing coagulation and sedimentation for 1-1.5h, adding filtered effluent to an adsorption tank, adding nanometer particles of which nuclear cores are made from Fe3O4 and shell layers are made from SiO2 to serve as an adsorbent, wherein the shell layer edges of nuclear shell structure granules are modified with an aza-macrocyclic carboxylic acid derivative derivative, performing adsorption treatment for 2-6h, then performing filtration, and adding the obtained filtrate to a post-treatment system or a water recovery tank. According to the method, the heavy metal ions in electroplating effluent can be effectively removed, and the method is low in treatment cost, energy-saving and environmentally friendly.

Description

Technical field: [0001] The invention relates to the technical field of waste water treatment, in particular to a treatment method for electroplating waste liquid containing heavy metal ions. Background technique: [0002] The electroplating industry is a heavily polluting industry. Due to the many types of plating and the cumbersome process, the composition of the wastewater is complex. The main feature of electroplating wastewater pollution is the coexistence of heavy metals and organic pollution. There are a variety of carcinogenic, teratogenic, mutagenic or highly toxic substances in electroplating wastewater, which are extremely harmful to humans. At present, the main plating types of electroplating are nickel plating, chrome plating, silver plating, copper plating, etc. During the electroplating production process, waste rinse water containing nickel, chromium, silver, and copper will inevitably be produced accordingly. [0003] At present, chemical methods are still ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04B01J20/22B01J20/28B01J20/30C02F103/16
CPCB01J20/06B01J20/103B01J20/22B01J20/28009C02F1/28C02F1/281C02F1/52C02F1/5245C02F1/56C02F9/00C02F2103/16
Inventor 王文庆
Owner 浙江升阳再生资源科技有限公司
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