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Catalyst for treatment of waste water, and method for treatment of waste water using the catalyst

A wastewater treatment and catalyst technology, which is applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of insufficient removal of nitrogen-containing compounds and generation of mildew, and achieve high purification and low cost effect

Inactive Publication Date: 2012-09-19
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, especially concerning the treatment of waste water containing nitrogenous compounds, red tides or musty odors due to eutrophication in sea areas, lakes, rivers, etc. have long been a problem, and the reason for this is that the Nitrogen and other nutrient salts are contained in the waste water of the water area
Therefore, although nitrogen-related waste water regulations are enforced, nitrogen-containing compounds cannot be sufficiently removed only by treatment with the existing activated sludge method, etc., so it is necessary to install a new denitrification process in many cases

Method used

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  • Catalyst for treatment of waste water, and method for treatment of waste water using the catalyst
  • Catalyst for treatment of waste water, and method for treatment of waste water using the catalyst
  • Catalyst for treatment of waste water, and method for treatment of waste water using the catalyst

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preparation example Construction

[0062] The method for preparing the catalyst of the present invention is not particularly limited, and the catalyst of the present invention can be easily prepared by known methods, for example, kneading method, impregnation method, adsorption method, spray method, ion exchange method and the like.

[0063] As described above, the catalyst of the present invention is characterized in that 70% by mass or more of the B component in the total amount of the B component is present in the surface layer from the outer surface of the oxide (catalyst) of the A component to a depth of 1000 μm or less. There is no particular limitation on the method of making most of the B component selectively exist in the surface layer of the oxide (catalyst) of the A component, as long as it is a method that allows the B component to exist in this way, the above-mentioned catalyst preparation method can be applied . The spraying method is preferable, and in particular, the method of spraying the aqueo...

Embodiment

[0158] The present invention will be described more specifically below by catalyst preparation examples, comparative preparation examples, examples and comparative examples, but the present invention is not limited to these examples.

[0159] In the following examples, the total nitrogen concentration represents the total concentration of unreacted nitrogen-containing compounds, ammoniacal nitrogen, and nitrate nitrogen. Nitrate nitrogen is the general term for nitrogen oxide ions, such as NO 3 - , NO 2 - .

[0160] The distribution state of B component and the measuring method of the average particle diameter are shown below.

[0161] (Measurement of distribution state of component B)

[0162] The ratio (% by mass) of the B component present in the surface layer of the catalyst to 1000 μm from the outer surface of the catalyst to the total amount of the catalyst was obtained as follows: by EPMA (electron probe microanalysis), the catalyst in the cross section of the cata...

preparation example 1

[0190] Iron oxide (Fe) prepared by co-precipitation method 2 o 3 )-alumina (Al 2 o 3 ) powder is formed into flakes and loaded with platinum (Pt). The average diameter of the sheet is 5mm, the average length is 6mm, and the specific surface area is 58m 2 / g. In order to highly disperse and support Pt as fine particles on the surface of the sheet, spray a solution obtained by adding sodium carbonate to an alkaline platinum complex aqueous solution while moving the sheet, and allow it to be supported. After the sheet was dried for 1 hour while rotating it in a hot air stream at 90° C., a reduction treatment was performed at 300° C. for 3 hours using a hydrogen-containing gas to obtain a catalyst (A-1). The mass ratio of the main component of the catalyst obtained is Fe 2 o 3 :Al 2 o 3 :Pt=90:9.7:0.3. In addition, the results of the investigation of the Pt distribution of catalyst A-1 (the ratio of Pt existing within 1000 μm from the surface of the substrate to the tota...

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Abstract

Disclosed are: a catalyst which can exhibit an excellent catalytic activity and excellent durability for a long period in the wet oxidation treatment of waste water; a wet oxidation treatment method for waste water using the catalyst; and a novel method for treating waste water containing a nitrogenated compound, in which a catalyst to be used has a lower catalytic cost, the waste water containing the nitrogenated compound can be treated at high purification performance, and the high purification performance can be maintained. The catalyst for use in the treatment of waste water comprises an oxide of at least one element selected from the group consisting of iron, titanium, silicon, aluminum, zirconium and cerium as a component (A) and at least one element selected from the group consisting of silver, gold, platinum, palladium, rhodium, ruthenium and iridium as a component (B), wherein at least 70 mass% of the component (B) is present in a region positioned within 1000 [mu]m from the outer surface of the component (A) (i.e., the oxide), the component (B) has an average particle diameter of 0.5 to 20 nm, and the solid acid content in the component (A) (i.e., the oxide) is 0.20 mmol / g or more. The waste water treatment method uses a catalyst (a pre-catalyst) which is placed on an upstream side of the direction of the flow of the waste water and can convert the nitrogenated compound contained in the waste water into ammoniacal nitrogen in the presence of an oxidizing agent at a temperature of not lower than 100 DEG C and lower than 370 DEG C under a pressure at which the waste water can remain in a liquid state and a downstream-side catalyst (a post-catalyst) which is placed downstream of the direction of the flow of the waste water and can treat the waste water containing ammoniacal nitrogen.

Description

technical field [0001] The present invention is an invention related to waste water treatment. In detail, the present invention relates to a catalyst for wastewater treatment and a wastewater treatment method using the catalyst. Moreover, the present invention also relates to a method for carrying out wet oxidation treatment in the presence of a solid catalyst for waste water containing nitrogen-containing compounds (the wet oxidation treatment using a solid catalyst and its method are also referred to as "wet oxidation treatment" and "wet oxidation treatment" respectively below). Catalytic Oxidation Treatment" and "Wet Catalytic Oxidation Treatment") to purify nitrogen-containing compounds in wastewater and detoxify wastewater. Background technique [0002] Conventionally, biological treatment, combustion treatment, Zimmerman process, and the like are known as wastewater treatment methods. [0003] As biological treatment, aerobic treatment such as activated sludge method...

Claims

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Application Information

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IPC IPC(8): C02F1/74B01J23/42B01J23/44B01J23/46B01J23/745B01J23/755B01J23/76B01J23/80B01J23/825B01J23/835B01J23/84B01J23/847B01J23/889
CPCB01J37/031B01J23/6562B01J35/1014B01J23/63B01J35/006B01J23/462C02F2101/38B01J37/0201B01J23/8973B01J23/894C02F1/725B01J23/8906B01J35/393B01J35/613
Inventor 西川洋平佐佐木纲也石井彻
Owner NIPPON SHOKUBAI CO LTD
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