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Method of Microwave Induced Catalytic Oxidation Treatment of Complexed Heavy Metal Wastewater

A technology of induced catalysis and oxidative treatment, applied in the fields of oxidizing water/sewage treatment, chemical instruments and methods, chemical/physical processes, etc. The effect of industrialized production, shortened processing time, and improved efficiency of network breaking

Active Publication Date: 2015-12-02
广州中德环境技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Adsorption, displacement precipitation, ion exchange, membrane filtration, electrocoagulation precipitation, and internal electrolysis are used to treat complexed heavy metal wastewater, but due to the chemical properties of complexed heavy metals Very stable, the above methods are difficult to effectively destroy the structure of the complex, even if part of the complex is broken, the intermediate product formed is difficult to biodegrade, therefore, a single method is difficult to work
The method combining advanced oxidation and chemical precipitation has become a research hotspot, but this method cannot fully mineralize organic matter, H 2 o 2 Low utilization rate, large amount of sludge, complicated operation, and heavy metal ions may be precipitated from the sludge again with the change of pH value, causing secondary pollution
[0004]Microwave (MW) is used in conjunction with the The combination of Fenton oxidation method (Fe2++H2O2) realizes the degradation and mineralization of pollutants, but its influence on microwave limited absorptive capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Soak 20-mesh activated carbon in 1mol / L nitric acid solution for 24 hours, then rinse repeatedly with distilled water until neutral, and dry at 105°C for later use;

[0025] (2) Weigh 10g of activated carbon soaked in nitric acid and impregnate it in 100mL containing 0.2mol / LFeSO 4 and 0.2mol / LMn(NO 3 ) 2 placed in the mixed solution, placed on a shaker, airtightly oscillated at room temperature for 24 hours, and dried at 105°C for 24 hours to obtain supported activated carbon;

[0026] (3) Put the loaded activated carbon into a quartz glass tube, and calcinate it in a 400W microwave oven for 15min under the protection of nitrogen;

[0027] (4) Take 200mL complex heavy metal (EDTA-Cu-Ni) wastewater, adjust the pH value to 5.0, add 4g loaded activated carbon, mix thoroughly for 30 minutes, then add 4mL30%H 2 o 2 Put the solution into a frequency conversion microwave reactor with a circulating microwave reaction tube, set the temperature at 70°C, and continue the ...

Embodiment 2

[0030](1) Soak 30-mesh activated carbon in 0.5mol / L sulfuric acid solution for 12 hours, then rinse repeatedly with distilled water until neutral, and dry at 105°C for later use;

[0031] (2) Weigh 10g of activated carbon soaked in nitric acid and impregnate it in 100mL containing 0.2mol / LFeSO 4 and 0.3mol / LMn(NO 3 ) 2 placed in the mixed solution, placed on a shaker, airtightly oscillated at room temperature for 24 hours, and dried at 105°C for 24 hours to obtain supported activated carbon;

[0032] (3) Put the loaded activated carbon into a quartz glass tube, and calcinate it in a 300W microwave oven for 15min under the protection of nitrogen;

[0033] (4) Take 200mL of complexed heavy metal (EDTA-Cu-Ni) wastewater, adjust the pH to 4.0, add 2g of loaded activated carbon, mix thoroughly for 40 minutes, and then add 6mL of 30%H 2 o 2 Put the solution into a frequency conversion microwave reactor with a circulating microwave reaction tube, set the temperature at 75°C, and ...

Embodiment 3

[0036] (1) Soak 50-mesh activated carbon in 1.5mol / L nitric acid solution for 24 hours, then rinse repeatedly with distilled water until neutral, and dry at 105°C for later use;

[0037] (2) Weigh 10g of activated carbon soaked in nitric acid and impregnate it in 100mL containing 0.3mol / LFeSO 4 and 0.1mol / LMn(NO 3 ) 2 placed in the mixed solution, placed on a shaker, airtightly oscillated at room temperature for 24 hours, and dried at 105°C for 24 hours to obtain supported activated carbon;

[0038] (3) Put the loaded activated carbon into a quartz glass tube, and calcinate it in a 400W microwave oven for 15min under the protection of nitrogen;

[0039] (4) Take 200mL of complexed heavy metal (EDTA-Cu-Ni) wastewater, adjust the pH to 3.0, add 4g of loaded activated carbon, mix thoroughly for 30 minutes, and then add 2mL of 30%H 2 o 2 Put the solution into a frequency conversion microwave reactor with a circulating microwave reaction tube, set the temperature at 75°C, and c...

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Abstract

The invention discloses an activated carbon-supported metal catalyst and a method for treating complexed heavy metal wastewater by microwave-induced catalytic oxidation. Greatly improve the efficiency of network breaking and the degradation efficiency of organic matter, the removal efficiency of heavy metal ions through chemical precipitation after network breaking is also significantly improved, the treatment time is greatly shortened, the operation is simple, continuous scale treatment is possible, industrial production is easy, and there is no secondary pollution. It is suitable for the treatment of complex heavy metal wastewater in electroplating, circuit board, chemical industry, metal smelting and other industries.

Description

technical field [0001] The invention belongs to the technical field of complexed heavy metal wastewater treatment, and relates to an activated carbon-loaded metal catalyst and a microwave-induced catalytic oxidation method for treating complexed heavy metal wastewater. Background technique [0002] Electroplating, circuit board, chemical industry, metal smelting and other industries discharge a large amount of complexed heavy metal wastewater into the environment during the production process. The complexes and heavy metals in the wastewater have strong binding ability, stable chemical properties, difficult to biodegrade, and can be bioaccumulated. , Environmental toxicity will even expand because of its persistence, posing a great threat to the environment. With the implementation of "Electroplating Pollutant Discharge Standards" (GB21900-2008) and "Clean Production Standards for Electroplating Industry" (HJ / T314-2006), higher requirements are put forward for heavy metals, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889C02F1/30C02F1/72C02F101/20
Inventor 林亲铁黎宏飞彭焕龙
Owner 广州中德环境技术研究院有限公司
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