CN107473364B - Catalytic filler for Fenton fluidized bed and preparation method thereof - Google Patents

Catalytic filler for Fenton fluidized bed and preparation method thereof Download PDF

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Publication number
CN107473364B
CN107473364B CN201710646940.1A CN201710646940A CN107473364B CN 107473364 B CN107473364 B CN 107473364B CN 201710646940 A CN201710646940 A CN 201710646940A CN 107473364 B CN107473364 B CN 107473364B
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filler
catalytic
fluidized bed
metal salt
activated carbon
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CN107473364A (en
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朱益民
刘伟凤
唐晓佳
尹琳
聂毅兴
吕琦玮
陈涛
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Dalian Maoyuan Technology Co ltd
Shaoxing Jiujiu Environment Technology Co ltd
Dalian Maritime University
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Dalian Maoyuan Technology Co ltd
Shaoxing Jiujiu Environment Technology Co ltd
Dalian Maritime University
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    • 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
    • C02F1/722—Oxidation by peroxides
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
    • C02F2103/343—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the pharmaceutical industry, e.g. containing antibiotics
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/02—Specific form of oxidant
    • C02F2305/026—Fenton's reagent

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Catalysts (AREA)

Abstract

The invention relates to a catalytic filler for a Fenton fluidized bed and a preparation method thereof, belonging to the field of wastewater treatment. The catalytic filler for the Fenton fluidized bed comprises a porous suspension filler and a catalyst layer; the catalyst layer is coated on the surface of the porous suspended filler; the catalyst layer comprises metal salt with Fenton reaction catalytic activity, activated carbon and a binder, wherein the weight ratio of the metal salt to the activated carbon to the binder is 0.3-1.2: 6: 1.0-1.5, wherein the loading amount of the metal salt on the activated carbon is 5-20%. The catalytic filler for the Fenton fluidized bed has a huge catalytic area, can effectively improve the oxidation efficiency and the utilization rate of hydrogen peroxide, can reduce the ineffective decomposition of the hydrogen peroxide, reduce the output of iron-containing sludge, improve the sewage treatment effect and reduce the dosage of a medicament and the operation cost.

Description

Catalytic filler for Fenton fluidized bed and preparation method thereof
Technical Field
The invention relates to a catalytic filler for a Fenton fluidized bed and a preparation method thereof, belonging to the field of wastewater treatment.
Background
The Fenton oxidation method is a widely used high-efficiency waste water treatment technology and is characterized in that hydrogen peroxide (H)2O2) In Fe2 +Can generate a large amount of hydroxyl free radicals (. OH) with extremely strong oxidizability under the catalytic action of the catalyst. In practical engineering application, the Fenton fluidized bed technology applies the Fenton reaction to a fluidized bed reactor system, greatly improves the Fenton efficiency, and has the advantages of simple operation, convenient use, rapid reaction and the like. The Fenton fluidized bed is particularly suitable for treating organic wastewater which is difficult to biodegrade, is gradually applied to the treatment engineering of wastewater such as landfill leachate, dye, paper pulp papermaking, daily chemicals, pesticides and the like, and has good application prospect.
The wastewater treatment effect of the Fenton fluidized bed is closely related to the type and the performance of the filler. The filler is in a fluidized state, so that the contact probability of hydroxyl radicals generated by hydrogen peroxide and organic matters in the wastewater can be greatly increased, and the chemical reaction and mass transfer efficiency can be improved; the catalyst loaded on the surface of the carrier filler can participate in catalytic decomposition of hydrogen peroxide, so that the dosage of the medicament is reduced, and the ferrous sludge amount and the treatment cost are reduced. However, the filler used in the Fenton fluidized bed generally has the problems of small catalytic area, high density, difficult fluidization, uneven size, difficult size adjustment and the like. For example: quartz sand, zeolite, iron-loaded ceramsite and the like are used as Fenton fluidized bed filler, and the specific surface area is small, so that the catalytic area is small, and the catalytic effect is not ideal; the particle density is high, and the fluidized state can be realized only by high rising flow velocity, so that the power consumption is high. In addition, when natural quartz sand, zeolite, etc. are used as fillers, the particle size of the fillers is difficult to be uniform, so that the fluidized state in the bed body is not uniform, the particle size of the fillers cannot be adjusted according to the actual wastewater treatment requirements, and the treatment effect of the Fenton fluidized bed is also influenced.
Disclosure of Invention
The invention solves the problems by wrapping the catalyst layer on the surface of the porous suspended filler, so that the porous suspended filler has the advantages of large catalytic area, small density, easy fluidization, uniform particle shape, controllable particle size and the like.
The invention provides a catalytic filler for a Fenton fluidized bed, which comprises a porous suspended filler and a catalyst layer;
the catalyst layer is coated on the surface of the porous suspended filler;
the catalyst layer comprises metal salt with Fenton reaction catalytic activity, activated carbon and a binder, wherein the weight ratio of the metal salt to the activated carbon to the binder is 0.3-1.2: 6: 1.0-1.5, wherein the loading amount of the metal salt on the activated carbon is 5-20%.
The metal salt of the present invention is preferably at least one of ferric chloride, manganese chloride, cobalt chloride, cupric chloride, ferric nitrate, manganese nitrate, cobalt nitrate and cupric nitrate.
The specific surface area of the activated carbon is preferably 500-2000m2/g。
The binder of the present invention is preferably polytetrafluoroethylene or polyvinylidene fluoride.
The specific surface area of the porous suspended filler of the invention is preferably 400-800m2/g。
The porous suspending filler of the present invention is preferably polypropylene or polyamide.
The particle size of the porous suspended filler of the invention is preferably 10 to 50 mm.
The specific surface area of the catalytic filler for the Fenton fluidized bed is 10000-20000m2/m3The catalytic active components of the catalyst comprise active carbon and Fe2O3、Fe3O4、MnO2CuO, CoO and Co3O4At least one of (1).
The invention also aims to provide a preparation method of the catalytic filler for the Fenton fluidized bed, which comprises the following steps:
uniformly mixing a metal salt solution and activated carbon, standing, adding a binder emulsion, uniformly mixing, and performing ultrasonic treatment to obtain viscous catalyst slurry;
the mass concentration of the binder emulsion is 20-60%;
and secondly, immersing the porous suspended filler in the viscous catalyst slurry, taking out the porous suspended filler, and activating to obtain the catalytic filler.
The step (i) of the invention preferably takes 6 to 12 hours of standing and 60 to 90 minutes of ultrasonic treatment.
The step (II) of the invention is preferably an activation method which comprises the following steps: activating the porous suspended filler immersed with the viscous catalyst slurry in an oven at 80-120 ℃ for 30-60 min; or activated for 15-25min in a microwave oven at 600-700W.
The invention has the beneficial effects that:
the catalytic filler for the Fenton fluidized bed has a large catalytic area, can effectively improve the oxidation efficiency and the utilization rate of hydrogen peroxide, can reduce the ineffective decomposition of the hydrogen peroxide, reduce the output of iron-containing sludge, improve the sewage treatment effect and reduce the dosage of a medicament and the operation cost;
the density of the catalytic filler for the Fenton fluidized bed is 0.95-1.13, and the catalytic filler can be fully fluidized by small aeration amount or stirring, so that the contact probability of hydroxyl radicals generated by hydrogen peroxide and organic matters in wastewater can be effectively increased, the reaction time is shortened, the volume of a treatment facility is reduced, and meanwhile, the power consumption and the operation cost of system aeration are reduced;
the shape of the catalytic filler for the Fenton fluidized bed is uniform, so that a uniform and good fluidized state can be achieved in the bed body; the proper particle size of the catalytic filler for the Fenton fluidized bed is selected, so that the requirements of different sewage treatment water quality and water quantity can be met, and the sewage treatment effect is ensured;
the catalytic filler for the Fenton fluidized bed has good stability, can be repeatedly used, is not easy to run off, and has no secondary pollution.
Drawings
In the figure 2 of the attached drawings of the invention,
FIG. 1 is a schematic structural view of a catalytic packing for a Fenton fluidized bed according to the present invention;
FIG. 2 is a sectional view of the catalytic packing for a Fenton fluidized bed according to the present invention;
wherein, 1, porous suspension filler, 2, catalyst layer.
Detailed Description
The following non-limiting examples are presented to enable those of ordinary skill in the art to more fully understand the present invention and are not intended to limit the invention in any way.
Example 1
A preparation method of catalytic filler for a Fenton fluidized bed comprises the following steps:
dissolving equal molar weight of ferric nitrate and manganous nitrate in water to obtain metal salt solution with metal ion concentration of 10mol/L, and adding into the solution with specific surface area of 1000m2Uniformly mixing activated carbon per gram, standing and soaking for 6 hours, wherein the loading capacity of Fe/Mn ions on the activated carbon is 5%, slowly dropwise adding polytetrafluoroethylene emulsion with the mass concentration of 60 wt%, uniformly mixing, and performing ultrasonic treatment for 60min to obtain viscous catalyst slurry, wherein the weight ratio of metal salt, activated carbon to polytetrafluoroethylene is 0.3: 6: 1;
immersing the polypropylene porous suspended filler with the particle size of 10mm in the viscous catalyst slurry to ensure that the surface of the polypropylene porous suspended filler is uniformly wrapped with the viscous catalyst slurry, taking out the polypropylene porous suspended filler, activating the polypropylene porous suspended filler in an oven at 80 ℃ for 60min to ensure that the porous suspended filler and the catalyst are stably combined, and activating the catalytic activity of the catalyst to obtain the catalytic filler, wherein the specific surface area of the porous suspended filler is 500m2/g。
Example 2
A preparation method of catalytic filler for a Fenton fluidized bed comprises the following steps:
dissolving equal molar weight of copper chloride and cobalt chloride in water to obtain metal salt solution with metal ion concentration of 20mol/L, adding the metal salt solution with specific surface area of 2000m2Uniformly mixing active carbon per gram, standing and soaking for 12 hours, slowly adding polyvinylidene fluoride emulsion with the mass concentration of 30 wt% and uniformly mixing, and performing ultrasonic treatment for 90min to obtain viscous catalyst slurry, wherein the metal salt, the active carbon and the polyvinylidene fluoride are mixedThe weight ratio of the alkene is 1.2: 6: 1.5;
immersing the polyamide porous suspended filler with the particle size of 50mm in the viscous catalyst slurry to ensure that the surface of the polyamide porous suspended filler is uniformly wrapped with the viscous catalyst slurry, taking out the polyamide porous suspended filler, activating the polyamide porous suspended filler in a microwave oven with 700W for 25min to ensure that the porous suspended filler and the catalyst are stably combined, and activating the catalytic activity of the catalyst to obtain the catalytic filler, wherein the specific surface area of the porous suspended filler is 800m2/g。
Effect example 1
The method comprises the following steps of treating printing and dyeing wastewater subjected to biochemical treatment in a certain printing and dyeing factory by utilizing a Fenton fluidized bed, wherein when a traditional catalyst is used, the adding amount of hydrogen peroxide is 0.064mol/L, and the molar ratio of the adding amount of hydrogen peroxide to ferrous iron is 1.8: 1, COD of the wastewaterCrThe concentration is reduced from 520mg/L to 364mg/L, and the removal rate is 57.0 percent; when the catalytic filler for Fenton's fluidized bed prepared in example 1 was used, the amount of hydrogen peroxide added was reduced to 0.025mol/L and the COD of the wastewater was reduced to 0.025mol/L under the same conditions of the amount of ferrous iron added and the amount of filler addedCrThe removal rate is reduced from 520mg/L to 98mg/L, the consumption of the hydrogen peroxide is reduced by 61 percent, and the sewage treatment efficiency is improved by 24.1 percent.
Effect example 2
Utilize the pharmaceutical wastewater of a certain pharmaceutical factory of fenton fluidized bed processing, when using traditional catalyst, the input amount of hydrogen peroxide is 0.042mol/L, and the input amount molar ratio of hydrogen peroxide and ferrous is 1.3: 1, COD of the wastewaterCrThe removal rate is reduced from 491mg/L to 198mg/L and is 59.7 percent; on the other hand, using the catalytic filler for Fenton's fluidized bed prepared in example 2, the amount of hydrogen peroxide added was reduced to 0.018mol/L and the COD of the wastewater was reduced to 0.018mol/L under the same amount of ferrous iron and fillerCrThe removal rate is reduced from 491mg/L to 72mg/L, the consumption of hydrogen peroxide is reduced by 57.1 percent, and the sewage treatment efficiency is improved by 25.6 percent.

Claims (3)

1. The catalytic filler for the Fenton fluidized bed is characterized in that: the catalytic filler for the Fenton fluidized bed comprises a porous suspension filler and a catalyst layer;
the catalystThe layer is coated on the surface of the porous suspension filler, and the specific surface area of the porous suspension filler is 400-800m2The particle size of the porous suspended filler is 10-50 mm;
the catalyst layer comprises metal salt with Fenton reaction catalytic activity, activated carbon and a binder, wherein the weight ratio of the metal salt to the activated carbon to the binder is 0.3-1.2: 6: 1.0-1.5, the loading amount of the metal salt on the activated carbon is 5-20 percent, and the specific surface area of the activated carbon is 500-2000m2The adhesive is polytetrafluoroethylene or polyvinylidene fluoride;
the metal salt is at least one of ferric chloride, manganese chloride, cobalt chloride, copper chloride, ferric nitrate, manganese nitrate, cobalt nitrate and copper nitrate;
the preparation method of the catalytic filler for the Fenton fluidized bed comprises the following steps:
uniformly mixing a metal salt solution and activated carbon, standing and soaking for 6-12h, adding a binder emulsion, uniformly mixing, and performing ultrasonic treatment to obtain viscous catalyst slurry;
the mass concentration of the binder emulsion is 20-60%;
immersing the porous suspended filler in the viscous catalyst slurry, taking out, and activating to obtain a catalytic filler;
the activation method in the step II comprises the following steps: activating the porous suspended filler immersed with the viscous catalyst slurry in an oven at 80-120 ℃ for 30-60 min; or activated for 15-25min in a microwave oven at 600-700W.
2. A catalytic packing for a fenton fluidized bed according to claim 1, wherein: the porous suspension filler is polypropylene or polyamide.
3. A catalytic packing for a fenton fluidized bed according to claim 1, wherein: the ultrasonic treatment time in the step (i) is 60-90 min.
CN201710646940.1A 2017-08-01 2017-08-01 Catalytic filler for Fenton fluidized bed and preparation method thereof Active CN107473364B (en)

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CN109107576A (en) * 2018-09-07 2019-01-01 宜兴市滨元环保设备有限公司 Fenton reactor nickel catalytic filler
CN109772370A (en) * 2019-03-01 2019-05-21 华东理工大学 A kind of water purification beaded catalyst and its preparation method and application
CN113087226A (en) * 2021-05-19 2021-07-09 新疆广汇新能源有限公司 Treatment method for removing COD (chemical oxygen demand) from sewage secondary strong brine

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