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Method for treating complex heavy metal wastewater through microwave-induced catalytic oxidation

A complex state, heavy metal technology, applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of destroying the complex structure, low utilization rate, limited microwave absorption capacity, etc., to achieve Ease of industrial production, improved removal efficiency, and shortened processing time

Active Publication Date: 2014-01-15
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 of combining advanced oxidation and chemical precipitation has become a research hotspot, but this method cannot fully mineralize organic matter, H2O2 utilization rate is low, and the amount of sludge is large , The operation is complex 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 / L Mn(NO 3 ) 2 In the mixed solution, place it on a shaker and vibrate in an airtight manner at room temperature for 24 hours, and dry it 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 4mL 30%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 cont...

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 / L Mn(NO 3 ) 2 In the mixed solution, place it on a shaker and vibrate in an airtight manner at room temperature for 24 hours, and dry it 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 complex heavy metal (EDTA-Cu-Ni) wastewater, adjust the pH value to 4.0, add 2g of loaded activated carbon, mix thoroughly for 40 minutes, then add 6mL 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, an...

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 / L Mn(NO 3 ) 2 In the mixed solution, place it on a shaker and vibrate in an airtight manner at room temperature for 24 hours, and dry it 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 complex heavy metal (EDTA-Cu-Ni) wastewater, adjust the pH value to 3.0, add 4g of loaded activated carbon, mix thoroughly for 30 minutes, then add 2mL 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...

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Abstract

The invention discloses an activated carbon-loaded metal catalyst and a method for treating complex heavy metal wastewater through microwave-induced catalytic oxidation. The activated carbon-loaded metal catalyst is prepared through the steps of activated carbon purifying, ferro-manganese loading and microwave-assisted sintering. When the activated carbon-loaded metal catalyst is used for treating the complex heavy metal wastewater, the complex breaking efficiency and organic matter degrading efficiency can be improved greatly, and the removal efficiency of heavy metal ions after complex breaking can be improved remarkably through chemical precipitation. The activated carbon-loaded metal catalyst and the method have the advantages as follows: the treating time is greatly shortened; the operation is simple; large-scale continuous treatment is achieved; industrial production is facilitated; secondary pollution is eliminated. The activated carbon-loaded metal catalyst and the method are suitable for treating complex heavy metal wastewater in the electroplating industry, the circuit board industry, the chemical industry, the metal smelting industry 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 Standard" (GB21900-2008) and "Clean Production Standard Electroplating Industry" (HJ / T 314-2006), higher requirements are put forward for heavy metals, COD, ...

Claims

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Application Information

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Patent Type & Authority Applications(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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