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Ozone catalyst for high-concentration organic nitrogen wastewater treatment

A wastewater treatment and catalyst technology, which is applied in physical/chemical process catalysts, water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problems of low ozone utilization rate, slow hydroxyl radical speed, weak acidity of hydroxyl, etc. Achieve cost reduction, increase utilization rate, and high catalytic efficiency

Active Publication Date: 2017-09-08
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This ozone catalyst has the following disadvantages: although some hydroxyl acid groups can be introduced under the modification of sodium hydroxide, the acidity of the hydroxyl is weak, the speed of generating hydroxyl radicals is slow, and the utilization rate of ozone is not high.

Method used

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  • Ozone catalyst for high-concentration organic nitrogen wastewater treatment
  • Ozone catalyst for high-concentration organic nitrogen wastewater treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Roasting: Weigh 100g of activated carbon, place it in a tube furnace, raise the temperature under the protection of nitrogen, and when the temperature reaches 300°C, introduce 7g of sulfur dioxide gas for roasting. After 2 hours of roasting, lower the temperature under the protection of nitrogen, and generate Lots of sulfur oxide groups.

[0026] 2. Impregnation: impregnate the roasted activated carbon in manganese nitrate, bismuth nitrate and lanthanum nitrate aqueous solution, wherein the molar percentage of manganese nitrate, bismuth nitrate and lanthanum nitrate in the impregnating aqueous solution is 8:1:1, take it out after immersion for 12 hours Dry in an oven at 105°C.

[0027] 3. Heat up the impregnated activated carbon under nitrogen protection, and roast at 500°C for 4 hours to obtain an ozone catalyst for high-concentration organic nitrogen wastewater treatment.

Embodiment 2

[0029] 1. Roasting: Weigh 100g of activated carbon, place it in a tube furnace, raise the temperature under the protection of nitrogen, and when the temperature reaches 400°C, feed 2g of sulfur dioxide gas for roasting. After 5 hours of roasting, lower the temperature under the protection of nitrogen, and produce Lots of sulfur oxide groups.

[0030] 2. Impregnation: impregnate the roasted activated carbon in copper nitrate, cobalt nitrate and cerium nitrate aqueous solution, wherein the molar percentage of copper nitrate, cobalt nitrate and cerium nitrate in the impregnating aqueous solution is 8:1:1, take it out after immersion for 24 hours Dry in an oven at 105°C.

[0031] 3. The impregnated activated carbon is heated up under the protection of nitrogen, and roasted at 600°C for 2 hours to obtain an ozone catalyst for the treatment of high-concentration organic nitrogen wastewater.

Embodiment 3

[0033] 1. Roasting: Weigh 100g of activated carbon, place it in a tube furnace, raise the temperature under the protection of nitrogen, and when the temperature reaches 500°C, pass in 2g of sulfur dioxide gas for roasting. After 2 hours of roasting, lower the temperature under the protection of nitrogen, and produce Lots of sulfur oxide groups.

[0034] 2. Impregnation: impregnate the roasted activated carbon in zinc nitrate, molybdenum nitrate and cerium nitrate aqueous solution, wherein the mass percentage of zinc nitrate, molybdenum nitrate and cerium nitrate in the impregnating aqueous solution is 8:1:1, after 36 hours of immersion, take it out in Dry in an oven at 105°C.

[0035] 3. Heat up the impregnated activated carbon under nitrogen protection, and roast at 800°C for 4 hours to obtain an ozone catalyst for high-concentration organic nitrogen wastewater treatment.

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Abstract

The invention discloses an ozone catalyst for high-concentration organic nitrogen wastewater treatment. The ozone catalyst comprises the following preparation steps: (1) roasting: roasting activated carbon in an atmosphere of sulfur dioxide and generating a large number of sulfur oxide groups on the surface of the activated carbon; (2) impregnating: impregnating the roasted activated carbon in impregnation liquid for 1-48 hours, then taking out and drying; (3) roasting: roasting the activated carbon obtained in the step (2) at a temperature of 500-800 DEG C to obtain the ozone catalyst for high-concentration organic nitrogen wastewater treatment. The ozone catalyst disclosed by the invention has relatively strong activity, so that the utilization rate of ozone can be greatly improved; while catalytic ozone oxidation is performed, oxygen in the ozone (residual oxygen for ozone preparation) can be utilized, so that the purpose of greatly reducing COD is achieved; the ozone catalyst disclosed by the invention is particularly suitable for high-concentration organic nitrogen wastewater treatment.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to an ozone catalyst for treating high-concentration organic nitrogen wastewater and a preparation method thereof. Background technique [0002] Ozone catalytic oxidation technology is an efficient sewage treatment technology, and it is a research hotspot in the field of industrial sewage treatment in recent years. Compared with ozone alone as an oxidant, the OH formed by ozone under the action of a catalyst has a higher reaction rate with organic matter and stronger oxidation, and can oxidize almost all organic matter, such as small molecule organic acids that cannot be degraded by ozone oxidation. , aldehydes, etc., can completely mineralize organic matter and improve the removal rate of sewage TOC. [0003] There are many preparation methods for ozone catalysts, but most of them are carrier-loaded metal oxides. The more common method is: equal volume impregnation method, mix...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J27/043B01J27/051C02F1/78C02F101/38C02F101/34
CPCB01J27/04B01J27/043B01J27/051C02F1/725C02F1/78C02F2101/34C02F2101/38
Inventor 雷秀卿陶海祥杜会璞张静赵瑞强
Owner ZHEJIANG QICAI ECO TECH CO LTD
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