Preparation of supported O3 catalyst and application thereof in COD removal of high-salt wastewater in coal chemical industry

A high-salt wastewater and catalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve cost-limited large-scale applications, and it is difficult to completely remove COD , increase the difficulty of crystallized salt purity, etc., to achieve the effect of good water treatment effect, easy acquisition and low cost

Active Publication Date: 2019-06-28
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above processing technologies have been applied to a certain extent in different fields, but still have their own limitations.
It is difficult to completely remove COD in wastewater by physical adsorption; Fenton method, NaClO method, etc. are easy to introduce new impurity ions, which increases the difficulty of crystal salt purity; the high cost of photocatalysis limits large-scale applications; Membrane materials cause a lot of clogging and irreversible pollution, which greatly increases operating costs
Ozone has strong oxidizing properties and does not produce secondary pollution, but the mass transfer efficiency of ozone in water is low, resulting in low actual utilization of ozone and increasing treatment costs
There is currently no method to overcome the above drawbacks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: a load type O 3 The preparation method of catalyst, this method is with 1kgγ-Al 2 o 3 Add 80L deionized water, then add 0.07kg KMnO 4 , 0.09kg Cu(NO 3 ) 2 ·3H 2 O was fully stirred for 2 h, hydrothermally reacted at 130 °C for 18 h, washed with deionized water until the effluent was colorless, and dried at 100 °C for 12 h to obtain powdery loaded MnO 2 γ-Al with CuO 2 o 3 Bimetallic oxide catalysts. Add 100 g of pseudo-boehmite and 2 g of concentrated nitric acid to the powdery catalyst obtained above, extrude, and dry at 110° C. for 12 hours. Get the catalyzer of above-mentioned forming of 0.20kg and add in 4L coal chemical industry high-salt wastewater, O 3 The volume flow rate was 300L / h, and after 120min of catalytic ozonation, the COD in the wastewater dropped from the initial value of 395mg / L to 94.0mg / L.

Embodiment 2

[0022] Embodiment 2: a load type O 3 The preparation method of catalyst, this method is with 1kgγ-Al 2 o 3 Add 80L deionized water, then add 0.1kg KMnO 4 , 0.06kg Cu(NO 3 ) 2 ·3H 2 O was fully stirred for 2 h, hydrothermally reacted at 120 °C for 20 h, washed with deionized water until the effluent was colorless, and dried at 100 °C for 12 h to obtain powdery loaded MnO 2 γ-Al with CuO 2 o 3 Bimetallic oxide catalysts. Add 100 g of pseudo-boehmite and 2 g of concentrated nitric acid to the powdery catalyst obtained above, extrude, and dry at 110° C. for 12 hours. Get the catalyst of 0.14kg above-mentioned forming and add in 4L coal chemical industry high-salt wastewater, O 3 The volume flow rate is 200L / h, after 90min of catalytic ozonation, the COD in the wastewater dropped from the initial value of 395mg / L to 91.6mg / L.

Embodiment 3

[0023] Embodiment 3: a kind of loading type O 3 The preparation method of catalyst, this method is with 1kgγ-Al 2 o 3 Add 80L deionized water, then add 0.11kg KMnO 4 , 0.05kg Cu(NO 3 ) 2 ·3H 2 O was fully stirred for 2 h, hydrothermally reacted at 150 °C for 18 h, washed with deionized water until the effluent was colorless, and dried at 100 °C for 12 h to obtain powdery loaded MnO 2 γ-Al with CuO 2 o 3 Bimetallic oxide catalysts. Add 100 g of pseudo-boehmite and 2 g of concentrated nitric acid to the powdery catalyst obtained above, extrude, and dry at 110° C. for 12 hours. Get the catalyzer of above-mentioned molding of 0.12kg and add in 4L coal chemical industry high-salt wastewater, O 3The volume flow rate was 300L / h, and after 120min of catalytic ozonation, the COD in the wastewater dropped from the initial value of 395mg / L to 90.8mg / L.

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Abstract

The invention relates to a preparation method of a catalyst, in particular to a preparation method of a supported O3 catalyst. The preparation method of the catalyst adopts a hydrothermal method, andthe specific steps are as follows: firstly, a certain mass of gamma-Al2O3 is placed into a container, then potassium permanganate and copper nitrate trihydrate are added, 60-90L deionized water is added to dissolve fully, then the mixture is transferred to a reaction kettle for hydrothermal reaction, after the reaction, the mixture is washed by using deionized water until the water is colorless, the mixture is dried at 90-120 DEG C for 10-15h to obtain heterogeneous double metal oxide catalyst with gamma-Al2O3 supported with MnO2 and CuO, pseudo-boehmite and concentrated nitric acid are added,extruding is carried out, the mixture is dried at 90-120 DEG C for 10-15 h; the invention also provides the application of the catalyst in COD removal of high-salt wastewater in coal chemical industry: the method has the advantages of simple operation, low cost, reusable catalyst, good water treatment effect, large-scale application and no secondary pollution.

Description

technical field [0001] The present invention relates to a kind of preparation method of catalyst, relate in particular to a kind of supported O 3 Preparation method of catalyst and its application in COD removal in high-salt wastewater of coal chemical industry. Background technique [0002] At present, high-salt wastewater from coal chemical industry is a difficult point in the treatment of industrial wastewater. It is characterized by high salt content and complex components, mainly containing K + 、Na + , CO 3 2- , NO 3 - , Cl - , SO 4 2- Plasma; the quality of wastewater in different process sections varies greatly. There are two main disposal schemes currently used. One is to send evaporation ponds to evaporate water naturally, but the effect is not ideal; the other is to use evaporation and crystallization technology to further recover water and produce crystalline salt. Evaporation and crystallization technology needs to carry out quality separation and salt ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J37/10C02F1/78C02F1/72C02F101/30
Inventor 马玉龙郑小霞金肖
Owner NINGXIA UNIVERSITY
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