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Method for processing landfill leachate through heterogeneous catalytic ozonation

A landfill leachate and ozone oxidation technology, which is applied in the fields of oxidized water/sewage treatment, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problem that the removal rate can only reach 25.3%, the ozone utilization efficiency is not high, and the treatment cost rises and other issues, to achieve the effects of small footprint, moderate price, and improved processing efficiency

Inactive Publication Date: 2011-06-29
JIANGSU POLYTECHNIC UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still some shortcomings in the ozone oxidation alone, such as the strong selectivity of the reaction between ozone and organic matter and the low utilization efficiency of ozone, which leads to an increase in processing costs.
When the landfill leachate is treated by ozone oxidation alone, the oxidation reaction takes 120 minutes, and the COD removal rate in the leachate can only reach 25.3%.

Method used

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  • Method for processing landfill leachate through heterogeneous catalytic ozonation
  • Method for processing landfill leachate through heterogeneous catalytic ozonation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] With copper as the active component and potassium as the co-catalyst loaded on the activated carbon carrier, the specific surface area of ​​the activated carbon carrier is 620m 2 / g, the bulk density is 450g / L, the weight percentage of copper is 0.5%, the weight percentage of potassium is 0.2%, and the rest are carriers. Soluble nitrate aqueous solution and potassium nitrate aqueous solution with a concentration of 0.1mol / L containing copper ions are used to impregnate the activated carbon carrier. The volume ratio of the aqueous solution to the active carrier is 1.0:1. Dry at ℃, then bake and solidify at 220℃ for 15 hours. Oxygen should be cut off during baking, and the finished product can be obtained after cooling.

[0023] The landfill leachate is subjected to heterogeneous catalytic ozone oxidation treatment using the system shown in the accompanying drawing, and the pH value of the landfill leachate is adjusted to 8 before being input into the waste water storage ...

Embodiment 2

[0025] With copper as the active ingredient and potassium as the co-catalyst loaded on the activated carbon carrier, the specific surface area of ​​the activated carbon carrier is 730m 2 / g, the bulk density is 520g / L, the weight percentage of copper is 2%, the weight percentage of potassium is 1%, and the rest is carrier. Impregnate the activated carbon support with the soluble nitrate aqueous solution and potassium nitrate aqueous solution containing copper ions at a concentration of 0.3mol / L. The volume ratio of the aqueous solution to the active carrier is 1.3:1. Dry at ℃, and bake at 240℃ for 17 hours. Oxygen should be cut off during baking, and the finished product can be obtained after cooling.

[0026]The landfill leachate is subjected to heterogeneous catalytic ozone oxidation treatment using the system shown in the accompanying drawing, and the pH value of the landfill leachate is adjusted to 9 before entering the waste water storage tank 2, the inflow of the landfil...

Embodiment 3

[0028] With copper as the active ingredient and potassium as the co-catalyst loaded on the activated carbon carrier, the specific surface area of ​​the activated carbon carrier is 860m 2 / g, the bulk density is 600g / L, the weight percentage of copper is 3%, the weight percentage of potassium is 3%, and the rest are carriers. Soluble nitrate aqueous solution and potassium nitrate aqueous solution with a concentration of 0.6mol / L containing copper ions are used to impregnate the activated carbon carrier. The volume ratio of the aqueous solution to the active carrier is 1.5:1. Dry at ℃, and bake at 260℃ for 20 hours. Oxygen should be cut off during baking, and the finished product can be obtained after cooling.

[0029] The landfill leachate is subjected to heterogeneous catalytic ozone oxidation treatment using the system shown in the accompanying drawing, and the pH value of the landfill leachate is adjusted to 10 before entering the waste water storage tank 2, the inflow of th...

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Abstract

The invention discloses a method for processing landfill leachate through heterogeneous catalytic ozonation in the field of wastewater treatment. Copper is used as an active component; kalium is used as a cocatalyst and loaded on an active carbon carrier to prepare an ozone catalysis catalyst; the weight percentage content of the copper as the active component is 0.5 to 3 percent of the ozone catalysis catalyst; the prepared ozone catalysis catalyst is thrown into an ozone catalysis oxidation reaction tower; simultaneously, the ozone and the landfill leachate with pH value of between 8 and 10are input into the ozone catalysis oxidation reaction tower; and after the reaction continues for 60 and 120 minutes, wastewater is neutralized and discharged. The method completes the reaction of thesolid catalyst, the landfill leachate and the ozone in a device; the degradation rate of COD reaches over 80 percent; and the removing rate of the ammonia-nitrogen number reaches over 97.5 percent. Aprocessing unit is small and compact, has small occupied area, little power equipment and low power consumption, does not need the addition of water for thinning, has low operating expense and convenient operation and can be automatically controlled.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a method for treating landfill leachate by adopting a heterogeneous catalytic ozone oxidation method. Background technique [0002] Landfill leachate is a kind of wastewater containing high concentration of refractory organic matter, complex components and large changes in water quality. With the extension of landfill time, its biochemical degradability gradually decreases, and it has been listed as a priority pollutant for environmental control in my country. The leachate contains a variety of toxic substances and carcinogens. If it is degraded under natural conditions, it will take 15 years for its chemical oxygen demand (COD, the same below) and biochemical oxygen demand (BOD, the same below) values ​​to reach It will take 24 to 26 years for ammonia nitrogen to meet the national emission standards. The characteristics of landfill leachate are as follows: 1) The water qual...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/78B01J23/78B01J37/02
Inventor 王利平刘宾昌胡德飞郭迎庆
Owner JIANGSU POLYTECHNIC UNIVERSITY