CN115301295B - Honeycomb catalyst for catalytic oxidation of ozone and preparation method and application thereof - Google Patents

Honeycomb catalyst for catalytic oxidation of ozone and preparation method and application thereof Download PDF

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Publication number
CN115301295B
CN115301295B CN202211119219.4A CN202211119219A CN115301295B CN 115301295 B CN115301295 B CN 115301295B CN 202211119219 A CN202211119219 A CN 202211119219A CN 115301295 B CN115301295 B CN 115301295B
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catalyst
ozone
peat
preparation
honeycomb catalyst
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CN115301295A (en
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庞一雄
李滨
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Aws Environment Technologies Ltd
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    • B01J35/56—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/78—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with alkali- or alkaline earth metals
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

Honeycomb catalyst for ozone catalytic oxidation and its preparation method and application. The invention relates to a catalyst for ozone catalytic oxidation, and relates to the field of water pollution purification. The catalyst is prepared from the following raw materials in parts by weight: 30-60 parts of peat, 10-20 parts of metal salt and 20-60 parts of forming agent, wherein the peat is prepared from dehydrated sludge, and the dehydrated sludge comprises ferric chloride and lime. The catalyst is prepared from peat, metal salt and a forming agent through a foaming reaction, wherein the peat is prepared from dehydrated sludge conditioned by ferric chloride and lime, and the catalyst has a large number of irregular pore structures, is used for catalytic oxidation of ozone, does not cause the bad condition of channeling, and can prevent the problem of COD removal rate reduction caused by uneven air-water flow.

Description

Honeycomb catalyst for catalytic oxidation of ozone and preparation method and application thereof
Technical Field
The invention relates to the field of water pollution purification, in particular to a honeycomb catalyst for ozone catalytic oxidation, a preparation method and application thereof.
Background
With the gradual improvement of the national requirements on the quality of water environment, the common biological or physical treatment process cannot meet the discharge requirements of wastewater, and advanced oxidation means are required to be introduced to carry out advanced treatment on the wastewater. At present, the ozone catalytic oxidation technology is one of common advanced oxidation technologies, has the advantages of no secondary pollution, no solid waste generation, no need of pH adjustment and the like compared with the traditional Fenton advanced oxidation technology, and is widely applied to the fields of organic wastewater treatment and tap water pretreatment. At present, a reaction tank for ozone catalytic oxidation engineering is generally in a fixed bed form, and the used catalyst is mainly small-particle high-density metal oxide pellets, activated carbon particles or carrier type catalysts. The catalyst is closely stacked in the reactor, the situation of uneven local water head resistance is inevitably caused, channeling phenomenon is formed, wastewater and ozone quickly pass through the position with smaller resistance, and only a small amount of catalyst can participate in degradation reaction at the moment, so that the catalytic effect of the ozone fixed bed is not obvious. On the other hand, the rising speed of ozone gas in water is higher, and a considerable part of ozone is not utilized, so that the ozone utilization rate is lower, and the operation cost is increased. Therefore, how to reduce channeling of the catalytic bed layer, increase the contact probability of the catalyst and ozone, and increase the ozone utilization rate is an important means for improving the ozone catalytic oxidation water treatment process. In view of the above-mentioned shortcomings of the haydite type ozone oxidation catalyst, those skilled in the art have improved water treatment effect by preparing a multi-channel type or honeycomb type ozone catalyst, but the method in the prior art has the following problems: the molecular sieve material with higher price is used as the raw material, the preparation method is complex, and special extrusion and embryo preparation processes are needed, so that the mass production is not facilitated; or the active ingredient of the prepared catalyst is a hydroxyl iron ingredient which is easily influenced by water quality change, has insufficient stability after long-term use, and is easy to run off along with water after long-term use; or the surface active material of the prepared catalyst is easy to be washed off and fall off by water flow in long-term use, so that the catalytic effect of the honeycomb catalyst is obviously reduced, and the defect limits the wide application of the catalyst.
Therefore, the defects of high raw material price, complex preparation process, easy invalidation or falling-off of active ingredients and the like of the honeycomb catalyst for ozone catalytic oxidation at present are problems to be solved by the technicians in the field.
Disclosure of Invention
Aiming at the technical problems, the invention provides a honeycomb catalyst for ozone catalytic oxidation, which is prepared from peat, metal salt and a forming agent through a foaming reaction, wherein the peat is prepared from dehydrated sludge conditioned by ferric chloride and lime, and the honeycomb catalyst has a large number of irregular pore structures, can not cause channeling bad conditions when being used for ozone catalytic oxidation, and can prevent the problem of COD removal rate reduction caused by uneven air water flow.
The invention provides a honeycomb catalyst for ozone catalytic oxidation, which is prepared from the following raw materials in parts by weight:
peat 30-60 parts
10-20 parts of metal salt
20-60 parts of a forming agent;
the peat is prepared from dewatered sludge, wherein the dewatered sludge comprises ferric chloride and lime.
The ferric chloride can provide catalytic activity, the lime is rich in calcium oxide, the ferric chloride and the lime are adopted in advance to condition the dehydrated sludge, so that the ferric chloride, the lime and the dehydrated sludge react, the microscopic shape of the sludge is changed, compared with the conventional operation, the specific surface area of the prepared catalyst can be obviously improved, the reactive site is increased, further, the reaction with acid formed by a metal salt solution in the subsequent precursor preparation step is carried out, the foaming reaction is realized, the honeycomb catalyst is prepared, and in the prior art, a foaming agent is additionally added in the foaming reaction process.
In one embodiment, the ferric chloride is used in an amount of 5% -45% of the dry sludge basis of the dewatered sludge, and the lime is used in an amount of 10% -40% of the dry sludge basis of the dewatered sludge.
In one embodiment, the metal salt comprises at least 1 of the following raw materials: metal nitrate, metal sulfate, or metal chloride; the metal is iron, copper, cobalt, nickel or manganese.
In one embodiment, the molding agent comprises at least 1 of the following materials: montmorillonite, clay, diatomaceous earth or kaolin.
The invention also provides a preparation method of the honeycomb catalyst, which comprises the following steps:
preparing a precursor: mixing peat, metal salt and a forming agent to obtain a mixture, and performing foaming reaction to obtain a precursor;
preparation of honeycomb catalyst: roasting the precursor to obtain the product.
The preparation method is simple and feasible, and a forming die is not needed.
In one embodiment, the method of preparing peat comprises the steps of: drying the dehydrated sludge, and roasting at 400-700 ℃ for 2-3 hours under the condition of inert gas atmosphere or vacuumizing to obtain peat;
in the step of preparing the precursor, the working concentration of the metal salt in the mixture is 0.25-1.25mol/L.
In one embodiment, in the step of preparing the precursor, the reaction temperature of the foaming reaction is 90-120 ℃.
In the prior art, the foaming reaction is usually carried out at normal temperature, but the foaming reaction adopts the temperature condition of 90-120 ℃, and the foaming reaction is insufficient and cannot form a large number of irregular pore canals when the temperature is too low, so that the prepared precursor is still in a agglomerated state; if the temperature is too high, the foaming reaction is too severe, bubbles are easy to aggregate to form large bubbles, so that the pores of irregular pore channels are too large, the specific surface area and active sites are reduced, and the performance of the catalyst is further reduced.
In one embodiment, in the step of preparing a honeycomb catalyst, the firing comprises: roasting for 4-8h at 800-1100 ℃ in air atmosphere.
The invention also provides a treatment method of the organic wastewater, which comprises the following steps: and adding the honeycomb catalyst into an ozone catalytic oxidation reaction tower, and setting ozone adding amount, overcurrent flow speed and hydraulic retention time of a catalyst layer to enable the organic wastewater to be treated to pass through the ozone catalytic oxidation reaction tower.
The method has good catalytic effect, so the mineralization rate of organic matters in the organic wastewater to be treated can be greatly improved.
In one embodiment, the volume ratio of the honeycomb catalyst to the ozone catalytic oxidation reaction tower is 1: (3-6), the ozone adding amount is 40-150 mg/liter of organic sewage to be treated, the overcurrent flow rate is 5-10m/h, the hydraulic retention time of the catalyst layer is 10-40min, the COD concentration of the organic sewage to be treated is 50-150mg/L, and the pH value of the organic sewage to be treated is 4-10.
Compared with the prior art, the invention has the following beneficial effects:
the honeycomb catalyst for ozone catalytic oxidation is prepared from peat, metal salt solution and a forming agent through foaming reaction, is honeycomb-shaped, has a large number of irregular pore structures, is used for the ozone catalytic oxidation process, does not cause the bad condition of channeling, and can prevent the reduction of COD removal rate caused by uneven air-water flow; the catalytic effect is good, and the mineralization rate of the organic matters is greatly improved.
Drawings
FIG. 1 is a schematic view showing the appearance of a catalyst of example 1 in experimental examples;
fig. 2 shows XRD patterns of the catalysts of example 1 and comparative example 3 in experimental examples.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Definition:
in the invention, the ozone catalytic oxidation technology comprises the following steps: the method is an advanced oxidation technology based on ozone, combines the strong oxidizing property of the ozone with the adsorption and catalytic properties of a catalyst, and can effectively solve the problem of incomplete degradation of organic matters.
Dehydrated sludge: refers to the solid residue left over after the wet sludge is dewatered by means of drainage or filtration.
Sludge dry basis: refers to the absolute dry sludge, and the dried sludge with the water content lower than 1 percent.
Precursor: refers to a form of existence before the target product is obtained.
Organic wastewater: refers to wastewater mainly containing organic pollutants.
The source is as follows:
the reagents, materials and equipment used in the examples are all commercially available sources unless otherwise specified; the test methods are conventional in the art unless otherwise specified.
Example 1
A honeycomb catalyst for catalytic oxidation of ozone and a preparation method thereof.
The preparation method of the honeycomb catalyst is as follows.
Preparing a precursor: uniformly mixing 40 parts of montmorillonite powder (forming agent) and 50 parts of dehydrated and dried sludge powder (i.e. peat), adding an equal volume of ferrous chloride solution (containing 10 parts of ferrous chloride), and fully mixing to obtain a mixture; the mixture was put into an oven, dried at 105 ℃ and foamed for 12 hours to obtain a precursor.
Preparation of honeycomb catalyst: the precursor is put into a muffle furnace, and baked for 1 hour at 1100 ℃ in an air atmosphere to obtain the honeycomb catalyst.
The dehydrated and dried sludge powder (i.e. peat) is prepared by the following method: the dewatered sludge comprises ferric chloride and lime, wherein the dosage of the ferric chloride is 5-45% of the dry sludge basis of the dewatered sludge, the dosage of the lime is 10-40% of the dry sludge basis of the dewatered sludge, the dewatered sludge is dried, and the dewatered sludge is roasted for 2-3 hours at the temperature of 400-700 ℃ under the condition of inert gas atmosphere or vacuumizing, so as to obtain peat.
Example 2
A honeycomb catalyst for catalytic oxidation of ozone and a preparation method thereof.
The preparation method of the honeycomb catalyst is as follows.
Preparing a precursor: uniformly mixing 40 parts of montmorillonite powder (forming agent) and 50 parts of dehydrated and dried sludge powder (i.e. peat), adding an equal volume of cobalt chloride solution (containing 10 parts of cobalt chloride), and fully mixing to obtain a mixture; the mixture was put into an oven, dried at 105 ℃ and foamed for 12 hours to obtain a precursor.
Preparation of honeycomb catalyst: the precursor is put into a muffle furnace, and baked for 1 hour at 1100 ℃ in an air atmosphere to obtain the honeycomb catalyst.
The dehydrated and dried sludge powder (i.e. peat) is prepared by the following method: the dewatered sludge comprises ferric chloride and lime, wherein the dosage of the ferric chloride is 5-45% of the dry sludge basis of the dewatered sludge, the dosage of the lime is 10-40% of the dry sludge basis of the dewatered sludge, the dewatered sludge is dried, and the dewatered sludge is roasted for 2-3 hours at the temperature of 400-700 ℃ under the condition of inert gas atmosphere or vacuumizing, so as to obtain peat.
Example 3
A honeycomb catalyst for catalytic oxidation of ozone and a preparation method thereof.
The preparation method of the honeycomb catalyst is as follows.
Preparing a precursor: uniformly mixing 40 parts of montmorillonite powder (forming agent) and 50 parts of dehydrated and dried sludge powder (i.e. peat), adding an equal volume of copper chloride solution (containing 10 parts of copper chloride), and fully mixing to obtain a mixture; the mixture was put into an oven, dried at 105 ℃ and foamed for 12 hours to obtain a precursor.
Preparation of honeycomb catalyst: the precursor is put into a muffle furnace, and baked for 1 hour at 1100 ℃ in an air atmosphere to obtain the honeycomb catalyst.
The dehydrated and dried sludge powder (i.e. peat) is prepared by the following method: the dewatered sludge comprises ferric chloride and lime, wherein the dosage of the ferric chloride is 5-45% of the dry sludge basis of the dewatered sludge, the dosage of the lime is 10-40% of the dry sludge basis of the dewatered sludge, the dewatered sludge is dried, and the dewatered sludge is roasted for 2-3 hours at the temperature of 400-700 ℃ under the condition of inert gas atmosphere or vacuumizing, so as to obtain peat.
Example 4
A honeycomb catalyst for catalytic oxidation of ozone and a preparation method thereof.
The preparation method of the honeycomb catalyst is as follows.
Preparing a precursor: uniformly mixing 30 parts of montmorillonite powder (forming agent) and 60 parts of dehydrated and dried sludge powder (i.e. peat), adding an equal volume of cobalt chloride solution (containing 10 parts of cobalt chloride), and fully mixing to obtain a mixture; the mixture was put into an oven, dried at 105 ℃ and foamed for 12 hours to obtain a precursor.
Preparation of honeycomb catalyst: the precursor is put into a muffle furnace, and baked for 1 hour at 1100 ℃ in an air atmosphere to obtain the honeycomb catalyst.
The dehydrated and dried sludge powder (i.e. peat) is prepared by the following method: the dewatered sludge comprises ferric chloride and lime, wherein the dosage of the ferric chloride is 5-45% of the dry sludge basis of the dewatered sludge, the dosage of the lime is 10-40% of the dry sludge basis of the dewatered sludge, the dewatered sludge is dried, and the dewatered sludge is roasted for 2-3 hours at the temperature of 400-700 ℃ under the condition of inert gas atmosphere or vacuumizing, so as to obtain peat.
Example 5
A honeycomb catalyst for catalytic oxidation of ozone and a preparation method thereof.
The preparation method of the honeycomb catalyst is as follows.
Preparing a precursor: uniformly mixing 60 parts of montmorillonite powder (forming agent) and 30 parts of dehydrated and dried sludge powder (i.e. peat), adding an equal volume of cobalt chloride solution (containing 10 parts of cobalt chloride), and fully mixing to obtain a mixture; the mixture was put into an oven, dried at 105 ℃ and foamed for 12 hours to obtain a precursor.
Preparation of honeycomb catalyst: the precursor is put into a muffle furnace, and baked for 1 hour at 1100 ℃ in an air atmosphere to obtain the honeycomb catalyst.
Comparative example 1
Commercial fixed bed iron-manganese ozone oxidation catalysts have an appearance of black spherical particles of 3 to 5 mm.
Comparative example 2
The catalyst used in the comparative example was non-catalytic glass beads, which were black spherical particles of 3 to 5mm in appearance, as the catalyst used in the comparative example for ozone oxidation alone.
Comparative example 3
A honeycomb catalyst for catalytic oxidation of ozone and a preparation method thereof.
The preparation method of the honeycomb catalyst is as follows.
Preparing a precursor: uniformly mixing 40 parts of montmorillonite powder (forming agent) and 50 parts of dehydrated and dried sludge powder (i.e. peat), adding an equal volume of ferrous chloride solution (containing 10 parts of ferrous chloride), and fully mixing to obtain a mixture; the mixture was put into an oven, dried at 105 ℃ and foamed for 12 hours to obtain a precursor.
Preparation of honeycomb catalyst: the precursor is put into a muffle furnace, and baked for 1 hour at 1100 ℃ in an air atmosphere to obtain the honeycomb catalyst.
The dehydrated and dried sludge powder (i.e. peat) is prepared by the following method: the dewatered sludge comprises ferric chloride and lime, wherein the dosage of the ferric chloride is 5-45% of the dry sludge basis of the dewatered sludge, the dosage of the lime is 5% of the dry sludge basis of the dewatered sludge, the dewatered sludge is dried, and the dewatered sludge is roasted for 2-3 hours at the temperature of 400-700 ℃ under the condition of inert gas atmosphere or vacuumizing, so as to obtain peat.
Experimental example
1. The catalyst prepared in example 1 and the catalyst prepared in comparative example 3 were observed and examined. The catalyst of example 1 has the external shape shown in fig. 1, and the XRD patterns of the catalysts of example 1 and comparative example 3 are shown in fig. 2.
The results show that: as shown in fig. 2, the peak marked by the circle in the corresponding curve of the catalyst of example 1 is the characteristic of the active component of iron oxide, and the peak is quite obvious, which indicates that the catalyst of example 1 has high catalytic activity; whereas the peak at the corresponding position of comparative example 3 is not apparent, indicating low catalytic activity.
2. The catalysts of each example and comparative example were subjected to ozone catalytic oxidation treatment of organic wastewater, and specific treatment methods are as follows.
3L of the catalyst of each example and comparative example is added into an ozone catalytic oxidation reaction tower with the volume of 10L, the hydraulic retention time of the catalyst layer is 20min, the ozone adding amount is 100 mg/liter of organic wastewater to be treated, the COD concentration of the organic wastewater to be treated is 105mg/L, the pH value of the organic wastewater to be treated is 6.7, and the overcurrent flow rate is 7m/h. And (3) measuring the concentration of the residual COD in the solution by using a national standard method, wherein the COD removal rate data are shown in the following table.
Table 1 COD removal rate data for each example, comparative example
/ Example 1 Example 2 Example 3 Example 4 Example 5 Comparative example 1 Comparative example 2 Comparative example 3
COD removal Rate (%) 76.1％ 62.0％ 65.2％ 63.7％ 68.3％ 42.8％ 23.5％ 34.3％
The results show that: the COD removal rate of examples 1-5 is significantly higher than that of comparative examples 1-3, whereas comparative example 3, due to the lower lime usage in the peat preparation process, results in no subsequent foaming reaction, and the catalyst performance is significantly reduced, far lower than that of each example.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (3)

1. The preparation method of the honeycomb catalyst for ozone catalytic oxidation is characterized in that the honeycomb catalyst is prepared from the following raw materials in parts by weight:
peat 30-60 parts
10-20 parts of metal salt
20-60 parts of a forming agent;
the metal salt comprises at least 1 of the following raw materials: metal nitrate, metal sulfate, or metal chloride; the metal is iron, copper, cobalt, nickel or manganese;
the forming agent comprises at least 1 of the following raw materials: montmorillonite, clay, diatomaceous earth or kaolin;
the preparation method of the honeycomb catalyst comprises the following steps:
preparing a precursor: mixing peat, metal salt and a forming agent to obtain a mixture, and performing foaming reaction to obtain a precursor; the working concentration of the metal salt in the mixture is 0.25-1.25mol/L; the reaction temperature of the foaming reaction is 90-120 ℃; the preparation method of the peat comprises the following steps: drying the dehydrated sludge, and roasting at 400-700 ℃ for 2-3 hours under the condition of inert gas atmosphere or vacuumizing to obtain peat; the dehydrated sludge comprises ferric chloride and lime, wherein the dosage of the ferric chloride is 5-45% of the dry sludge basis of the dehydrated sludge, and the dosage of the lime is 10-40% of the dry sludge basis of the dehydrated sludge;
preparation of honeycomb catalyst: roasting the precursor to obtain the catalyst; the firing includes: roasting for 4-8h at 800-1100 ℃ in air atmosphere.
2. A method for treating organic wastewater, characterized in that the method comprises the following steps: the honeycomb catalyst prepared by the preparation method of claim 1 is added into an ozone catalytic oxidation reaction tower, and the ozone addition amount, the overcurrent flow rate and the hydraulic retention time of a catalyst layer are set so that the organic wastewater to be treated passes through the ozone catalytic oxidation reaction tower.
3. The method according to claim 2, wherein the volume ratio of the honeycomb catalyst to the ozone catalytic oxidation reaction tower is 1: (3-6), the ozone adding amount is 40-150 mg/liter of organic sewage to be treated, the overcurrent flow rate is 5-10m/h, the hydraulic retention time of the catalyst layer is 10-40min, the COD concentration of the organic sewage to be treated is 50-150mg/L, and the pH value of the organic sewage to be treated is 4-10.
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活性炭负载催化剂臭氧催化氧化处理印染废水研究;洪浩峰;潘湛昌;徐阁;肖楚民;魏志钢;徐慎颖;;工业用水与废水(03);全文 *

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