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Catalytic oxidation treatment method for landfill leachate

A technology of landfill leachate and catalytic oxidation, which is applied in the fields of oxidized water/sewage treatment, chemical instruments and methods, special compound water treatment, etc. High problems, to achieve the effect of short treatment time, high oxidation efficiency and no secondary pollution

Active Publication Date: 2018-11-06
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The Chinese invention patent "A Method for Treatment of Landfill Leachate by Ozone Oxidation with Nanomaterial Heterogeneous Catalysis" (Application No. 201410489398.X) discloses a method for catalyzing ozone oxidation of landfill leachate by nano-copper sulfide, which improves the leachate The degradation efficiency of medium and refractory organics, but this method requires high pH value (pH6-10), low COD removal rate (less than 60%), and organic solvents are used many times in the catalyst preparation process
Chinese invention patent "a method and device for treating landfill leachate by photoelectric Fenton oxidation reaction based on modified gas diffusion electrode" (application number 201510235743.1) uses photoelectric Fenton oxidation of landfill leachate to improve the treatment effect of landfill leachate , but this method needs real-time adjustment of the pH value of the system in the range of acidic conditions, long reaction time (at least 3 hours), easy to produce iron sludge, and complicated operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Put 40-mesh activated carbon in 1mol / L nitric acid solution, soak it in a water bath at 60°C for 8 hours, wash it with distilled water until the pH value does not change, and dry it at 105°C;

[0019] (2) Weigh 7.5g of activated carbon and soak it in 100mL solution obtained by mixing equal volumes of cobalt-copper solution with a concentration ratio of 1:1.5 (0.48mol / LCo(NO 3 ) 2 +0.72mol / LCu(NO 3 ) 2 ), after rapid mechanical stirring for 4 hours under the condition of 80°C water bath, dry at 90°C;

[0020] (3) Place activated carbon loaded with transition metals in a muffle furnace and calcinate at 400°C for 2h;

[0021] (4) Take 100mL landfill leachate, add 1g loaded activated carbon and 4gNa 2 S 2 o 8 , put it into a frequency conversion microwave reactor with a circulating microwave reaction tube, set the temperature at 70°C, and continue the reaction for 20 minutes, then add 7mL of 30% H 2 o 2 , continue to react for 25min;

[0022] (5) Let the oxidiz...

Embodiment 2

[0024] (1) Put 20-mesh activated carbon in 2mol / L nitric acid solution, soak it in a water bath at 50°C for 8 hours, wash it with distilled water until the pH value does not change, and dry it at 105°C;

[0025] (2) Weigh 7.5g of activated carbon and impregnate it in 75mL solution obtained by mixing equal volumes of cobalt-copper solution with a concentration ratio of 1:0.42 (0.72mol / LCo(NO 3 ) 2 +0.3mol / LCu(NO 3 ) 2 ), after rapid mechanical stirring for 6 hours under the condition of 60°C water bath, dry at 105°C;

[0026] (3) Place activated carbon loaded with transition metals in a muffle furnace and calcinate at 300°C for 3h;

[0027] (4) Take 100mL landfill leachate, add 1g loaded activated carbon and 3gNa 2 S 2 o 8 , put it into a frequency conversion microwave reactor with a circulating microwave reaction tube, set the temperature at 80°C, and continue the reaction for 15 minutes, then add 9 mL of 30% H 2 o 2 , continue to react for 20min;

[0028] (5) Let the...

Embodiment 3

[0030](1) Put 30-mesh activated carbon in 1mol / L nitric acid solution, soak it in a water bath at 70°C for 6 hours, wash it with distilled water until the pH value does not change, and dry it at 105°C;

[0031] (2) Weigh 7.5g of activated carbon and impregnate it into 112.5mL solution obtained by mixing equal volumes of cobalt-copper solution with a concentration ratio of 1:1 (0.6mol / LCo(NO 3 ) 2 +0.6mol / LCu(NO 3 ) 2 ), after rapid mechanical stirring for 4 hours under the condition of 80°C water bath, dry at 110°C;

[0032] (3) Place activated carbon loaded with transition metals in a muffle furnace and calcinate at 400°C for 2h;

[0033] (4) Take 100mL landfill leachate, add 2g loaded activated carbon and 4gNa 2 S 2 o 8 , put it into a frequency conversion microwave reactor with a circulating microwave reaction tube, set the temperature at 70°C, and after continuing the reaction for 20 minutes, add 8 mL of 30% H 2 o 2 , continue to react for 20min;

[0034] (5) Let ...

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Abstract

The invention discloses a catalytic oxidation treatment method for landfill leachate. 1-2 g of activated carbon supported metal catalyst is added into every 100 mL of the landfill leachate, 3-4 g of NaS2O8 is added, the mixture is put in a frequency conversion type microwave reactor, a reaction is conducted for 15-20 min at the temperature of 70-80 DEG C, 7-9 mL of H2O2 is added, and the reaction continues to be conducted for 20-25 min. The oxidation efficiency of the landfill leachate is high, the COD removal effect is good, the treatment time is short, secondary pollution is avoided, implementation is easy, and the requirement for the pH is not high.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a catalytic oxidation treatment method for landfill leachate. Background technique [0002] The sanitary landfill method has the advantages of low cost, mature technology, and convenient management. It is widely used in waste treatment. However, the landfill process produces highly polluting landfill leachate, which threatens drinking water and industrial and agricultural water sources. At present, landfill leachate treatment technologies include biological treatment, physical treatment, chemical treatment and land treatment. Among them, the biological treatment method has low energy consumption, low operating costs, and can effectively degrade organic pollutants, but it is not suitable for treating "aging" leachate with poor biochemical properties. Physical treatment methods mainly include coagulation, activated carbon adsorption, membrane separation and ion exchange, bu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F1/30B01J23/75
CPCB01J23/75C02F1/302C02F1/722C02F1/725C02F2305/023
Inventor 林亲铁姚晓声曾令泽
Owner GUANGDONG UNIV OF TECH