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MnO2-Co2O3-CeO2-SnO2 deamination catalyst, and preparation method and application thereof

A catalyst and co-catalyst technology, used in catalyst activation/preparation, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problems of large power consumption, low efficiency and slow catalytic oxidation of ammonia nitrogen, requiring more than ten days or even a month, etc. , to achieve high-efficiency green oxidation, improve activity and transfer capacity, and improve the effect of catalytic oxidation capacity

Active Publication Date: 2020-08-04
BEIJING ORIGINWATER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the oxidation product of the commonly used biological method is nitrate nitrogen, and the biological method is very sensitive to indicators such as temperature, pH, influent ammonia nitrogen concentration, and influent COD, resulting in unstable water production, total nitrogen or ammonia nitrogen in the produced water exceeds the standard; breaking point The chlorine addition method is a chemical method, which can completely oxidize low-concentration ammonia nitrogen into nitrogen gas, but the breakpoint chlorine addition method is prone to produce chlorine-containing organic by-products, and there is a risk of secondary pollution; the ozone catalytic oxidation method requires a large amount of energy to prepare ozone Moreover, most of the oxidation products are nitrate nitrogen, which is difficult to turn into nitrogen gas. At the same time, the efficiency of ozone catalytic oxidation is very low, and it is difficult to oxidize ammonium ions efficiently. The ammonia nitrogen in the produced water is unstable, and it is difficult to meet the requirements of municipal sewage ammonia nitrogen treatment.
The existence of these problems makes it difficult for the current municipal sewage treatment to meet the surface category III standard, which means that municipal sewage cannot be reused as a high-quality regenerated water source. For China, which is severely short of water, this is is a waste of water
[0003] In order to solve the above problems, the Chinese patent document CN105000722B provides a kind of active filter material preparation system for catalytic oxidation removal of ammonia nitrogen in water. The manganese dioxide catalytic membrane loaded on the quartz sand substrate is used to oxidize the ammonia nitrogen in groundwater, which solves the problem of biological method. It also solves the problem of instability of the produced water of ammonia nitrogen, and also solves the problem of additional oxidizing agents required for the treatment of ammonia nitrogen by the breakpoint chlorine method, which leads to increased costs and secondary pollution. It also solves the problem of large power consumption in the ozone catalytic oxidation method. problem, but the product after the oxidation treatment of this method is nitrate, not nitrogen, which cannot meet the requirement that the total nitrogen of the produced water is less than 1ppm; and the film formation process of this method is very slow, and it takes more than ten days or even a month; and this method The obtained manganese dioxide catalytic membrane loaded on the quartz sand base only has the catalytic effect of manganese dioxide, and the efficiency of catalytic oxidation of ammonia nitrogen is very low. It can only deal with the treatment of groundwater with ammonia nitrogen concentration of only 1-2ppm, and it is difficult to deal with higher concentrations (20- 80ppm) the treatment of ammonia nitrogen in municipal sewage

Method used

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  • MnO2-Co2O3-CeO2-SnO2 deamination catalyst, and preparation method and application thereof
  • MnO2-Co2O3-CeO2-SnO2 deamination catalyst, and preparation method and application thereof
  • MnO2-Co2O3-CeO2-SnO2 deamination catalyst, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0084] The MnO of this embodiment 2 -Co 2 o 3 -CeO 2 -SnO 2 The preparation method of deammonization catalyst comprises the following steps:

[0085] (1) Clinoptilolite pretreatment: take 1kg of natural clinoptilolite, particle diameter is 1-3mm, clean the dust on the surface of clinoptilolite with tap water, after rinsing 3 times, clinoptilolite is placed in the oven, Dry at 110°C for 4 hours, then take it out for use;

[0086] (2) Preparation of oxidation solution: use deionized water as solvent, prepare KMnO containing 0.05mol / L 4 and 15L of a mixed solution of 3mol / L NaOH, as an oxidation solution;

[0087] (3) Preparation of reducing solution: use deionized water as solvent, prepare 0.048mol / L MnCl 2 , 0.01mol / LCoCl 2 , 0.01mol / L Ce(NO 3 ) 3 , 0.01mol / L SnCl 2 15L of the mixed solution is used as the reducing solution;

[0088] (4) Impregnation of reducing solution: Pour 15L of reducing solution into a glass drum containing 1 kg of pretreated clinoptilolite, s...

Embodiment 2

[0094] Such as image 3 Shown, the treatment device of the ammonia nitrogen waste water described in the present embodiment, comprises: filter column 1, is packed with the MnO described in embodiment 1 in the filter column 1 2 -Co 2 o 3 -CeO 2 -SnO 2 Deammonization catalyst, the top of the filter column 1 is provided with a waste water inlet, the waste water inlet is connected with the water collection tank 2 through the first pipeline, the first pipeline is provided with a booster pump 3 and a flow meter 4, and the bottom of the filter column 1 is provided with a waste water outlet; An aeration inlet is also provided at the bottom of the column, and the aeration inlet is connected with the aeration pump 5 through a second pipeline, an air flow meter 6 is arranged on the second pipeline, and an aeration outlet is arranged at the top of the filter column. The filter column is made of plexiglass, with an inner diameter of 0.1 m and a height of 3 m.

[0095] The working proc...

Embodiment 3

[0097] This embodiment adopts the MnO of embodiment 1 2 -Co 2 o 3 -CeO 2 -SnO 2 For the deammonization catalyst, the ammonia nitrogen wastewater treatment device of Example 2 was used to treat the prepared ammonia nitrogen containing water, so as to test the ammonia nitrogen wastewater treatment ability of the catalyst. The MnO of Example 1 2 -Co 2 o 3 -CeO 2 -SnO 2 The deammonization catalyst is used to fill the filter column, and then the ammonia nitrogen wastewater treatment device is continuously operated, and the treated water is sampled and tested at regular intervals.

[0098] In this embodiment, an ammonium chloride water sample prepared with pure water as influent is used, wherein the concentration of ammonia nitrogen is about 40 mg / L. The prepared ammonia nitrogen wastewater is fed into the water through a peristaltic pump according to the hydraulic retention time of 60 minutes, and the water flow rate is 2BV / h. At the same time, the intake valve is opened f...

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Abstract

The invention provides a MnO2-Co2O3-CeO2-SnO2 ammonium removal catalyst as well as a preparation method and application thereof. The MnO2-Co2O3-CeO2-SnO2 ammonium removal catalyst is composed of a carrier, an active component and a cocatalyst, wherein the active component and the cocatalyst are loaded on the carrier; the active component is MnO2; the cocatalyst is a Co2O3-CeO2-SnO2 compound; Co2O3, CeO2 and SnO2 are doped in MnO2. According to the composite ammonium removal catalyst, through the synergistic catalysis effect of the active components and the cocatalyst in the catalyst and the strong adsorption effect of the carrier on ammonium ions, other chemical reagents do not need to be added, auxiliary means such as photoelectricity do not need to be used, and ammonia nitrogen in wastewater can be efficiently converted into nitrogen only by utilizing dissolved oxygen in a water body.

Description

technical field [0001] The invention belongs to the technical field of ammonia nitrogen wastewater treatment, in particular to a MnO 2 -Co 2 o 3 -CeO 2 -SnO 2 Deammonization catalyst, preparation method and application. Background technique [0002] Urban domestic sewage is the product of urban development. With the acceleration of urbanization and industrialization, the output of municipal sewage is increasing, and the pollution is becoming more and more serious, which restricts the sustainable development of urban social economy. Therefore, the reasonable treatment of municipal sewage has been become the focus of research. Municipal sewage often contains a large amount of ammonia nitrogen compounds, the concentration of ammonia nitrogen is about 20-80mg / L, which belongs to low and medium concentration ammonia nitrogen wastewater. At present, for the oxidation and removal of low-concentration ammonia nitrogen in municipal sewage, there are mainly biological methods, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/076B01J37/02C02F1/72C02F1/74C02F1/28C02F101/16
CPCB01J29/076B01J37/0201B01J37/0213B01J37/0236C02F1/725C02F1/727C02F1/74C02F1/281C02F2101/16B01J2229/186B01J2229/20
Inventor 俞开昌莫恒亮李锁定陈亦力吴文辉袁璐璐孟佳意刘曼曼
Owner BEIJING ORIGINWATER TECH CO LTD
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