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a load type o 3 Preparation of catalyst and its application in COD removal of high-salt wastewater in coal chemical industry

A catalyst and supported technology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., which can solve the problem of cost-limited large-scale application and the difficulty of increasing the purity of crystalline salt , It is difficult to completely remove COD and other problems, and achieve the effect of good water treatment effect, easy acquisition and low cost

Active Publication Date: 2022-03-22
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 catalyst of 0.20kg above-mentioned molding to add in 4L coal chemical industry high-salt wastewater, O 3 The volume flow rate is 300L / h, and after 120min of catalytic ozonation, the COD in the wastewater drops 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 to the powdery catalyst obtained above, 2 g of concentrated nitric acid, extrude, and dry at 110°C for 12 hours. Get the catalyst of 0.14kg above-mentioned molding to 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 to the powdery catalyst obtained above, 2 g of concentrated nitric acid, extrude, and dry at 110°C for 12 hours. Get the catalyst of 0.12kg above-mentioned molding to add in 4L coal chemical industry high-salt wastewater, O 3The volume flow rate is 300L / h, and after 120min of catalytic ozonation, the COD in the wastewater drops from the initial value of 395mg / L to 90.8mg / L.

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Abstract

The present invention relates to a kind of preparation method of catalyst, relate in particular to a kind of supported O 3 The preparation method of the catalyst, the preparation method of the catalyst adopts the hydrothermal method, and the specific steps are as follows: first put a certain quality of γ-alumina into the container, then add potassium permanganate and copper nitrate trihydrate, add 60 ~90L of deionized water is fully dissolved and then transferred into the reactor for hydrothermal reaction. After the reaction, wash with deionized water until the effluent is colorless, and dry at 90~120℃ for 10~15 hours to obtain γ‑Al 2 o 3 load MnO 2 Pseudoboehmite and concentrated nitric acid are added to the heterogeneous double metal oxide catalyst of CuO, extruded, and dried at 90-120°C for 10-15 hours; Application in COD removal: the method of the present invention is simple to operate, low in cost, reusable catalyst, good in water treatment effect, scalable in application, and does not produce 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 Patents(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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