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Process for treating ammonia-nitrogen wastewater with medium and low concentration through catalytic ozonation of metallic oxides

A low-concentration ammonia nitrogen and ozone oxidation technology, applied in special compound water treatment, oxidized water/sewage treatment, water/sewage treatment, etc., can solve the problem of no ammonia nitrogen, achieve no secondary pollution, high purification efficiency, simple process Effect

Inactive Publication Date: 2015-03-25
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the survey, although ammonia (NH 3 ) non-catalytic oxidation and homogeneous catalytic oxidation of ammonia nitrogen (NH 4 + ), but there is no report on the oxidation of ammonia nitrogen in water by heterogeneous catalysis

Method used

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  • Process for treating ammonia-nitrogen wastewater with medium and low concentration through catalytic ozonation of metallic oxides
  • Process for treating ammonia-nitrogen wastewater with medium and low concentration through catalytic ozonation of metallic oxides
  • Process for treating ammonia-nitrogen wastewater with medium and low concentration through catalytic ozonation of metallic oxides

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Experimental program
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Effect test

Embodiment 1

[0024] Metal oxide catalytic ozone oxidation treatment of ammonia nitrogen wastewater: the flow rate is 100mL / min O 2 Access initial NH 4 + -N concentration is 108mg / L in the solution and heated to 50°C. At this temperature, 1.0g / L cobalt oxide powder is added to the ammonia nitrogen wastewater, and the inlet gas is changed to mixed gas O 3 / O 2 (80mg / L of O 3 , The total flow rate is maintained at 100mL / min), the ammonia nitrogen in the water is catalyzed and oxidized. After continuous oxidation for 3 hours, 4 + -N conversion rate reached 65.2%, and NO in the product 3 -The content is 6.5%.

Embodiment 2

[0026] Metal oxide catalytic ozone oxidation treatment of ammonia nitrogen wastewater: the flow rate is 100mL / min O 2 Access initial NH 4 + -N concentration is 140mg / L in the solution and heated to 60°C. At this temperature, 0.8g / L cobalt oxide powder is added to the ammonia nitrogen wastewater, and the inlet gas is changed to mixed gas O 3 / O 2 (90mg / L of O 3 , The total flow rate is kept at 100mL / min), the ammonia nitrogen in the water is catalyzed and oxidized. After 7 hours of continuous oxidation, NH 4 + -N conversion rate reached 71.0%, and NO in the product 3 — The content is 9%.

Embodiment 3

[0028] Metal oxide catalytic ozone oxidation treatment of ammonia nitrogen wastewater: the flow rate is 100mL / min O 2 Access initial NH 4 + -N concentration is 100mg / L in the solution and heated to 80°C. At this temperature, 2.5g / L cobalt oxide powder is added to the ammonia nitrogen wastewater, and the inlet gas is changed to mixed gas O 3 / O 2 (110mg / L of O 3 , The total flow rate is maintained at 100mL / min), the ammonia nitrogen in the water is catalyzed and oxidized. After continuous oxidation for 6 hours, NH 4 + -N conversion rate reached 80.0%, and NO in the product 3 — The content is 15%.

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Abstract

The invention relates to the technique of ammonia-nitrogen wastewater treatment, particularly relates to a process for treating ammonia-nitrogen wastewater with medium and low concentration through catalytic ozonation of metallic oxides. The process comprises the following steps: introducing O2 into ammonia-nitrogen wastewater with medium and low concentration at a flow rate of 100mL / min and heating to 30-80 DEG C; at the temperature of 30-80 DEG C, adding a catalyst cobaltous oxide (Co3O4) powder into the ammonia-nitrogen wastewater, introducing O3 / O2 mixed gas at a total flow rate of 100mL / min and carrying out catalytic oxidation on ammonia and nitrogen in water for 2-8h continuously, wherein the addition amount of the catalyst cobaltous oxide is 0.2-3.0g / L and the addition amount of O3 is 50-120mg / L, the percent conversion of NH4<+>-N is 37-73%, and the NO3- content of products is 2-21%. The process is high in purification efficiency, simple in flow and free of secondary pollution.

Description

Technical field [0001] The invention relates to an ammonia nitrogen wastewater treatment technology, in particular to a metal oxide catalytic ozone oxidation treatment process for low-concentration ammonia nitrogen wastewater. Background technique [0002] Industrial high-concentration ammonia-nitrogen wastewater is generally directly converted into medium and low-concentration ammonia-nitrogen wastewater by stripping. When the ammonia nitrogen in the water is enriched, it will inhibit natural nitrification, cause water hypoxia, cause fish poisoning, and reduce the water self-purification ability. Therefore, the medium and low concentration ammonia nitrogen wastewater is also harmful to the environment, and it is urgently needed to be treated again. At present, the treatment technologies for low-concentration ammonia nitrogen wastewater mainly include ion exchange, breakpoint chlorination, and biological methods. The ion exchange method has shortcomings such as small adsorption...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/78C02F1/72C02F1/58
CPCC02F1/78C02F1/586C02F1/727C02F2101/16C02F2201/78C02F2301/00C02F2305/02
Inventor 陈云嫩聂锦霞
Owner JIANGXI UNIV OF SCI & TECH
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