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Method for treating wastewater by ozone catalytic wet oxidation

A technology for treating wastewater and wet oxidation, which is applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, catalyst activation/preparation, etc., and can solve the problems of low effective utilization of ozone

Active Publication Date: 2020-07-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of them can fundamentally solve the problem of low effective utilization of ozone.

Method used

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  • Method for treating wastewater by ozone catalytic wet oxidation
  • Method for treating wastewater by ozone catalytic wet oxidation
  • Method for treating wastewater by ozone catalytic wet oxidation

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0058] Preparation of Catalyst A1

[0059] The macroporous alumina powder and peptizer are kneaded, rolled, and extruded to make a clover-shaped carrier with a diameter of 2.5 mm, and then calcined at 550 ° C in the air to obtain Al 2 o 3 Carrier, specific surface area 220 m 2 / g, pore volume 0.7 cm 3 / g, the average pore diameter is 10.4nm. Weigh 500g of alumina carrier, according to its water absorption with Fe(NO 3 ) 3 9H 2 O by Fe 2 o 3 Accounting for the ratio of 7.5% of the total weight of the catalyst to form a solution. An equal volume of the solution was used to impregnate the alumina carrier for 2 hours, dried at 80° C., and then calcined in a muffle furnace at 550° C. for 4 hours. After the temperature dropped to room temperature, it was taken out to obtain catalyst A1.

[0060] Preparation of Catalyst A2

[0061] The diameter is 2.0mm, the specific surface area is 100 m 2 / g, pore volume 0.4 cm 3 / g, strip-shaped TiO with an average pore diameter of 3.4...

Embodiment 1

[0079] The catalysts A1 and B1 are loaded into the cylindrical reactor according to the volume percentage of 50% and 50% respectively, and the total volume of the catalyst is 100cm 3 . Dye wastewater (COD: 296.4 mg / L) enters the reactor from the bottom of the reactor at a flow rate of 200 mL / min, the residence time in the catalyst bed is 30 minutes, and the ozone concentration is 9.5 g / m 3 , at a rate of 400 mL / min, enters the bottom of the reactor together with the waste water. The reaction is carried out at normal temperature and pressure. After the reaction, the COD of the liquid is tested, and the catalyst activity is measured according to the removal rate of COD. The ozone concentration before and after the reactor is detected online with an ozone detector to calculate the effective utilization rate of ozone. The results are listed in Table 1.

Embodiment 2

[0081] Catalysts A3 and B1 were loaded into the reactor according to volume percentages of 40% and 60% respectively, and the reaction conditions were the same as in Example 1. The results are listed in Table 1.

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Abstract

The invention relates to the technical field of wastewater treatment and particularly discloses a method for treating wastewater by ozone catalytic wet oxidation. The method comprises the following steps: enabling organic wastewater and ozone to enter a reactor for reaction, wherein the reactor is filled with a catalyst A and a catalyst B in sequence according to a contact sequence with organic wastewater, the catalyst A is a transition metal or precious metal supported catalyst, the catalyst B comprises a composite carrier and an active metal component, and the composite carrier comprises active carbon and basic carbonate. The method provided by the invention not only has high COD removal capacity, but also can improve the effective utilization rate of ozone and reduce the addition amountof ozone.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to a method for treating wastewater, in particular to a method for treating wastewater by using ozone catalytic wet oxidation. Background technique [0002] With the rapid development of the petrochemical industry, the discharge of a large amount of wastewater with refractory organic pollutants has caused serious harm to human health and the environment, and has restricted the sustainable development of the social economy. With the increasing concern of national policies and regulations on environmental issues, the treatment of organic wastewater has become a hot spot in the field of wastewater treatment in my country at this stage. It is of great significance to reduce the discharge of wastewater discharge pollutants, reduce the sewage charges of enterprises and reduce the consumption of water resources. [0003] Advanced Oxidation Technology (AOP) means that the oxidation ab...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/78B01J23/745B01J23/46B01J29/46B01J29/03B01J23/83B01J23/06B01J23/34B01J35/10B01J37/02B01J37/08B01J37/18C02F101/30
CPCB01J23/745B01J23/462B01J29/46B01J29/0333B01J23/83B01J23/06B01J23/34B01J37/0201B01J37/082B01J37/18C02F1/725C02F1/78C02F2101/30B01J35/19B01J35/615B01J35/633
Inventor 赵越蒋广安李宝忠王雪清马传军
Owner CHINA PETROLEUM & CHEM CORP
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