Composite ozone catalyst for treating COD in sewage and preparation method thereof

A composite catalyst and catalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low catalytic efficiency of catalysts, reduce the amount of ozone input, reduce operating costs, and improve the overall The effect of catalytic effect

Inactive Publication Date: 2018-10-26
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a composite ozone catalytic oxidation catalyst for efficiently degrading nbsCOD in sewage a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1

[0024] Weigh 1000g p-type alumina, and take by weighing iron salt, cobalt salt and copper salt raw materials according to the total amount of iron oxide, copper oxide and cobalt oxide accounting for the ratio of 2.5 wt% of aluminum oxide, wherein iron oxide: copper oxide: cobalt oxide =2:2:1. Then put the weighed raw materials together in a container, add an appropriate amount of water, put it into a ball-milling jar and mix it by ball-milling to make it fully mixed, and then put it in a drying oven to dry at 100 °C to obtain a mixed material. The dried mixed material is pulverized and ground to obtain a mixed fine material with a particle size of ≤250 mesh. The ground mixed fines were placed in a granulator, and at a speed of 10 r / min, 3 % polyethylene glycol solution was sprayed into the pellets to form spherical spherical catalyst raw meal of 3-5 mm. The prepared spherical catalyst raw meal was put into a box-type resistance furnace and calcined at 400 ...

Example Embodiment

[0025] Example 2

[0026] Weigh 1000g p-type alumina, and take by weighing iron salt, cobalt salt and copper salt raw material according to the total amount of iron oxide, copper oxide and cobalt oxide accounting for 10.0 wt% of aluminum oxide, wherein iron oxide: copper oxide: oxide Cobalt = 2:2:1. Then, the weighed raw materials are placed in a container together, and an appropriate amount of water is added, put into a ball-milling jar and ball-milled and mixed to make it fully mixed, and then put into a drying box and dried at 100 °C to obtain a mixed material. The dried mixed material is pulverized and ground to obtain a mixed fine material with a particle size of ≤250 mesh. The ground mixed fines were placed in a granulator, and 15% polyethylene glycol solution was sprayed into the granulator at a rotational speed of 40 r / min to form 7-9 mm spherical catalyst raw meal. The prepared spherical catalyst raw meal was put into a box-type resistance furnace and calcined at 55...

Example Embodiment

[0027] Example 3

[0028] Weigh 1000g p-type alumina, and take by weighing iron salt, cobalt salt and copper salt raw materials according to the total amount of iron oxide, copper oxide and cobalt oxide accounting for 5.0 wt% of aluminum oxide, wherein iron oxide: copper oxide: oxide Cobalt = 2:2:1. Then, the weighed raw materials are placed in a container together, and an appropriate amount of water is added, put into a ball-milling jar and ball-milled and mixed to make it fully mixed, and then put into a drying box and dried at 100 °C to obtain a mixed material. The dried mixed material is pulverized and ground to obtain a mixed fine material with a particle size of ≤250 mesh. The ground mixed fines were placed in a granulator, and 10% polyethylene glycol solution was sprayed into the granulator at a rotational speed of 30 r / min to form 5-7 mm spherical catalyst raw meal. The prepared spherical catalyst raw meal was put into a box-type resistance furnace and calcined at 45...

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Abstract

The invention relates to a composite ozone catalyst for treating nbsCOD in sewage and a preparation method thereof. The composite catalyst takes double-pore-size rho-type aluminium oxide as a carrier,and active components comprise iron oxide, copper oxide and cobalt oxide. The rho-type aluminium oxide, iron salt, cobalt salt and copper salt are mixed with water to be ball milled and mixed uniformly, then are dried and pulverized to obtain a mixture with a particle size less than or equal to 250 mesh, the mixture is put into a granulator and mixed with a 3-15% of polyethylene glycol solution by weight, a 3-9-millimeter spherical catalyst raw material is prepared at the rotational speed of 10-40 round per minute, and finally calcination is carried out for 2-6 hours at 400-550 DEG C to obtain the composite catalyst. In the active components, the ratio of iron oxide to copper oxide to cobalt oxide is 2:2:1, and the total mass of the active components is 2.5-10% of the mass of the rho-typealuminium oxide carrier by weight. The prepared composite catalyst has a density of 0.70-1.10 grams per cubic centimeter, a water absorption rate of 55.0-83.1%, a porosity of 50.0-85.7% and compressive strength more than 80 N, and has excellent removal efficiency for the nbsCOD in industrial wastewater.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to a composite ozone catalyst for treating COD in sewage and a preparation method thereof. Background technique [0002] At present, my country's industrial wastewater treatment standards are becoming more and more stringent, and the biological treatment (secondary treatment) process has been unable to meet the discharge standards. In the secondary treatment of conventional sewage treatment plants, biochemical treatment has removed most of the biodegradable COD, and the rest is mainly soluble non-degradable COD (nbsCOD). With the full implementation of my country's new standards, even some economically developed areas The standard that is being gradually implemented requires COD not to be higher than 30mg / L. With the higher and higher standards for effluent COD, nbsCOD has brought more and more difficulties in meeting the water standards. In this regard, more and more s...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J35/00B01J35/02B01J37/08C02F1/72C02F1/78
CPCB01J23/002B01J23/75B01J35/0026B01J35/023B01J37/0018B01J2523/00C02F1/725C02F1/78B01J2523/17B01J2523/31B01J2523/842B01J2523/845
Inventor 徐会君杜庆洋于华芹贲韬李强
Owner SHANDONG UNIV OF TECH
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