CN1251972C - Light degradable processing method for waste water containing greasy dirt - Google Patents
Light degradable processing method for waste water containing greasy dirt Download PDFInfo
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- CN1251972C CN1251972C CN 200410096697 CN200410096697A CN1251972C CN 1251972 C CN1251972 C CN 1251972C CN 200410096697 CN200410096697 CN 200410096697 CN 200410096697 A CN200410096697 A CN 200410096697A CN 1251972 C CN1251972 C CN 1251972C
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Abstract
The present invention discloses a light degradable processing method for waste water containing greasy dirt, which belongs to the technical range of water treatment. The method comprises: preparing nanometer magnetic TiO2 composite photocatalyst in a suspended state, degradation processing photocatalysts and recycling the photocatalysts. The outer surfaces of nanometer Fe3 O4 core particles are firstly coated with a layer of SiO2 by a collosol-gelatin method, the TiO2 outer layers are coated by the same method to prepare nanometer magnetic TiO2 composite photocatalysts of which the average particle diameters are about 21 nanometers, the composite photocatalysts are suspended in waste water containing greasy dirt, the waste water is irradiated by an additional ultraviolet light source when the waste water passes through a rotary type transparent pipeline, and the photocatalytic degradation function of the nanometer magnetic TiO2 composite photocatalysts suspended in the waste water containing greasy dirt is utilized for degrading greasy dirt. 2 to 4 magnetic material nets are arranged at discharge outlets for recycling the photocatalysts. The present invention has good photocatalytic activity, is easy in use and recover, and promotes the industrialization application of a TiO2 photocatalysis system in a suspended state in waste water degradation.
Description
Technical field
The invention belongs to the water technology scope, particularly a kind of light degradable processing method for waste water containing greasy dirt.
Background technology
In environment protection, industrial sewage and wastewater treatment are the problems that national governments and enterprise all must face every day.Because the organism in sewage, the waste water is difficult to the place to go, therefore develops and harmful organic substance concentration efficiently can be reduced to the problem that the below the mark scientific worker of being of safety dumping pays special attention to fast, at low cost.20 th century later, the scientific worker finds titanium dioxide (TiO
2) photocatalyst has characteristic such as degraded various organic compound etc., caused TiO
2Photocatalyst applications is in the tide of environmental purification and sewage disposal research and development.The titanium dioxide metal-oxide semiconductor (MOS) is under the irradiation of UV-light, and it is right to produce electronics-hole, and can produce the free group of strong oxidizing property and make organic matter degradation.Therefore, TiO
2The photocatalyst material that can be used as organic matter degradation is used for industrial sewage, waste water and oily water treatment.Nano-TiO
2Owing to have unique small-size effect, surface effects, higher acid and alkali-resistance chemical stability and high photocatalytic activity, be the preferred material of sewage Photodegradation catalyst.Thereby nano-TiO
2Photocatalytic degradation waste water is present industrial sewage New Process for Treatment of greatest concern in the world.
The nano-TiO that is used for photocatalytic degradation
2Suspension and fixing two kinds of forms of shape can be arranged.Suspension TiO
2Powder have specific surface area big, can and pending solution thorough mixing, accept the advantage such as effective of illumination, photocatalysis efficiency height, and reactor is simple.But be suspended in the TiO in the solution
2Powder is difficult to reclaim, and makes the catalyzed degradation cost very high, thereby is difficult to be applied to field such as sewage disposal, and this has restricted suspension TiO
2The practical application of photocatalytic degradation system.The main fixedly shape photocatalyst that adopts in the photocatalytic degradation applied research at present, and adopt fixed-bed reactor, to reduce running cost, be applied to industrial sewage now abroad and handled.But fixedly the light-catalysed photocatalytic degradation efficient of shape is far below the suspended state photocatalytic system.In order to improve photocatalysis efficiency, the scientific worker has carried out a series of exploratory studys in recent years, as adopting TiO
2Be carried on the carriers such as hollow glass or ceramic fine bead, porous plastics, resin and wood chip and make the floated photocatalyst, can improve the effective rate of utilization of catalyzer, but hollow glass or ceramic fine bead granularity are little, are difficult to interception and reclaim, and can cause the loss and the secondary pollution of water surface solid of catalyzer; And the light stability of carriers such as porous plastics, resin and wood chip is relatively poor, has limited the commercial applications of this technology.However, researching and developing callable suspended state photocatalyst system to significantly improve the significant and practical value of photocatalytic degradation efficient, also is the trend of domestic and international researchdevelopment.
This study group has carried out magnetic substance and TiO recently
2Combine, be assembled into the photocatalyst of magneticsubstance carrying, utilize the research of magnetic recovery catalyzer then.Now successfully prepare the magnetic Nano TiO that multilayer coats
2The composite photo-catalyst particle, average particle size is about 21nm, has extraordinary photocatalytic activity, is easy to reclaiming.Therefore, can be used as the suspended state photocatalyst, this will promote suspended state TiO
2Photocatalysis body ties up to the industrial applications in the sewage degraded.
In the oil recovery process of land and offshore oilfield, the processing of oily(waste)water is an important sewage disposal operation.Result of study shows, TiO
2Can effectively the degrade oil of oily(waste)water of photocatalyst.Can efficiently oil be degraded to innoxious substance if adopt the suspension nano photocatalyst to carry out photocatalytic degradation.Therefore, with magnetic Nano TiO
2Composite photo-catalyst is applied to oily water treatment significant practical value and market outlook.And will drive the industrial preparation of this photocatalyst and the development that industry is handled in other industrial sewage photodegradation, significant to China environmental protection and environmental protection industry development.Utilize this method to handle oily(waste)water with lower cost photodegradation.By literature search, do not see the relevant report that has both at home and abroad.
Summary of the invention
The present invention proposes a kind of light degradable processing method for waste water containing greasy dirt.It is characterized in that: the treatment process of described oily(waste)water comprises suspended state magnetic Nano TiO
2The preparation of composite photo-catalyst, photocatalyst for degrading are handled and photocatalyst reclaims.
1) magnetic Nano TiO
2The preparation of composite photo-catalyst: adopt nanometer Fe
3O
1Particle is a core, adopts sol-gel processing to coat one deck SiO earlier
2, and then adopt sol-gel processing to coat TiO
2Skin is prepared magnetic Nano TiO
2Composite photo-catalyst: magnetic Nano Fe
3O
1Particle is kernel size: 5～20nm; SiO
2About 1～the 2nm in middle layer; TiO
2Photocatalyst coating layer: 5-20 nanometer.And with magnetic Nano TiO
2Composite photo-catalyst carries out appropriate surface acid to be handled, and it is suspended in oily(waste)water easily.
2) the photocatalyst for degrading treatment process of oily(waste)water: will carry out surface-treated magnetic Nano TiO
2Composite photo-catalyst is suspended in the oily(waste)water it with the ultrasonic vibration mode, and add-on is about: 0.02～0.2% (V/V).Allow sewage pass through the Clothoid type transparent pipeline then, accept to add ultraviolet source irradiation, irradiation time is about: 20～80 minutes (increase the intensity of light source, can shorten irradiation time).Utilization is suspended in the magnetic Nano TiO of oily(waste)water
2The photocatalytic Degradation degraded greasy dirt of composite photo-catalyst.
3) photocatalyst is recycled: after the photocatalytic degradation processing of sewage enough time of process reaches emission request, discharge, 2-4 road magneticsubstance net is set, adding under the action of a magnetic field at discharge outlet, and can easy recovery magnetic Nano TiO
2Composite photo-catalyst.
Bar magnet that described magneticsubstance net is an ordered arrangement and/or magneticmetal net.
The invention has the beneficial effects as follows and adopt sol-gel processing to prepare the magnetic Nano TiO that multilayer coats
2The composite photo-catalyst particle, average particle size is about 21nm, has extraordinary photocatalytic activity, is easy to reclaiming.Therefore, can be used as the suspended state photocatalyst, this will promote suspended state TiO
2Photocatalysis body ties up to the industrial applications in the sewage degraded.
Embodiment:
The present invention proposes a kind of light degradable processing method for waste water containing greasy dirt.This method comprises suspended state magnetic Nano TiO
2The preparation of composite photo-catalyst, photocatalyst for degrading are handled and photocatalyst is recycled.
1) magnetic Nano TiO
2The preparation of composite photo-catalyst: adopt nanometer Fe
3O
1Particle is a core, adopts sol-gel processing to coat one deck SiO earlier
2, and then adopt sol-gel processing to coat TiO
2Skin is prepared magnetic Nano TiO
2Composite photo-catalyst: magnetic Nano Fe
3O
1Particle is kernel size: 5～20nm; SiO
2In ask the layer about a 1～2nm; TiO
2Photocatalyst coating layer: 5-20 nanometer.And with magnetic Nano TiO
2Composite photo-catalyst carries out appropriate surface acid to be handled, and it is suspended in oily(waste)water easily.Through X-ray diffraction and tem study, the TiO after the calcining
2Be the Detitanium-ore-type structure, through check, magnetic Nano TiO
2The median size of composite photo-catalyst particle is about 21 nanometers.
2) the photocatalyst for degrading treatment process of oily(waste)water: utilize magnetic Nano TiO
2The composite photo-catalyst skin is TiO
2, under the irradiation of UV-light, can produce electronics-hole to and can produce the characteristics that the free group of strong oxidizing property is degraded various organism (as wet goods), with magnetic Nano TiO
2Composite photo-catalyst is suspended in the oily(waste)water, and photocatalytic degradation oils organic compound will carry out surface-treated magnetic Nano TiO under the light source irradiation effect adding
2Composite photo-catalyst is suspended in the oily(waste)water it with the ultrasonic vibration mode, and add-on is about: 0.02～0.2% (V/V).Allow sewage pass through the Clothoid type transparent pipeline then, accept to add ultraviolet source irradiation, irradiation time is about: 20～80 minutes (increase the intensity of light source, can shorten irradiation time).Utilization is suspended in the magnetic Nano TiO of oily(waste)water
2The photocatalytic Degradation degraded greasy dirt of composite photo-catalyst.Utilize the comparative study method, analyzed magnetic Nano TiO
2The photocatalytic degradation activity of composite photo-catalyst is found prepared magnetic Nano TiO
2Composite photo-catalyst has good photocatalytic activity, performance and De Guass P25 nano-TiO
2Photocatalyst is close.And has good suspension property.
3) photocatalyst is recycled: after the photocatalytic degradation processing of sewage enough time of process reaches emission request, discharge, 2-4 road magneticsubstance net is set, adding under the action of a magnetic field at discharge outlet, and can easy recovery magnetic Nano TiO
2Composite photo-catalyst.
Bar magnet that above-mentioned magneticsubstance net is an ordered arrangement and/or magneticmetal net.
Claims (2)
1. light degradable processing method for waste water containing greasy dirt, it is characterized in that: the treatment process of described oily(waste)water comprises suspended state magnetic Nano TiO
2The preparation of composite photo-catalyst, photocatalyst for degrading are handled and photocatalyst reclaims:
1) magnetic Nano TiO
2The preparation of composite photo-catalyst: adopt nanometer Fe
3O
4Particle is a core, adopts sol-gel method to coat one deck SiO earlier
2, and then adopt sol-gel method to coat TiO
2Skin is prepared magnetic Nano TiO
2Composite photo-catalyst: magnetic Nano Fe
3O
4Particle is kernel size: 5～20nm; SiO
2Middle layer 1～2nm; TiO
2The photocatalyst coating layer: the 5-20 nanometer, and with magnetic Nano TiO
2Composite photo-catalyst carries out appropriate surface acid to be handled, and it is suspended in oily(waste)water easily;
2) the photocatalyst for degrading treatment process of oily(waste)water: will carry out surface-treated magnetic Nano TiO
2Composite photo-catalyst is suspended in the oily(waste)water it with the ultrasonic vibration mode, add TiO
2Composite photo-catalyst is 0.02～0.2% of an oily(waste)water volume, allows sewage pass through the Clothoid type transparent pipeline then, accepts to add ultraviolet source irradiation, and irradiation time is: 20～80 minutes, utilize the magnetic Nano TiO that is suspended in oily(waste)water
2The photocatalytic Degradation degraded greasy dirt of composite photo-catalyst;
3) photocatalyst is recycled: discharge after the photocatalytic degradation processing of sewage enough time of process reaches emission request, at discharge outlet 2-4 road magneticsubstance net is set, adding under the action of a magnetic field, reclaim magnetic Nano TiO
2Composite photo-catalyst.
2. according to the described light degradable processing method for waste water containing greasy dirt of claim 1, it is characterized in that: bar magnet that described magneticsubstance net is an ordered arrangement and/or magneticmetal net.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410096697 CN1251972C (en) | 2004-12-07 | 2004-12-07 | Light degradable processing method for waste water containing greasy dirt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410096697 CN1251972C (en) | 2004-12-07 | 2004-12-07 | Light degradable processing method for waste water containing greasy dirt |
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| Publication Number | Publication Date |
|---|---|
| CN1613785A CN1613785A (en) | 2005-05-11 |
| CN1251972C true CN1251972C (en) | 2006-04-19 |
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| CN 200410096697 Expired - Fee Related CN1251972C (en) | 2004-12-07 | 2004-12-07 | Light degradable processing method for waste water containing greasy dirt |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100449656C (en) * | 2006-12-14 | 2009-01-07 | 复旦大学 | Magnetic nanometer particle with triple core-shell structure and method for making same |
| CN102068995B (en) * | 2011-01-11 | 2012-10-24 | 河北师范大学 | Preparation method of nano magnetic core-shell catalyst for degrading dye wastewater |
| CN102795736B (en) * | 2011-05-25 | 2014-08-13 | 四川环能德美科技股份有限公司 | Deep treatment method for anion exchange resin regeneration waste solution |
| CN102357363A (en) * | 2011-07-23 | 2012-02-22 | 上海海事大学 | Nano-Fe3O4/SiO2/TiO2-loaded magnetical visible-light catalyst and preparation method thereof |
| CN102351356B (en) * | 2011-09-16 | 2013-08-07 | 清华大学 | Method and device for purifying thickened oil-containing sewage |
| CN103359868A (en) * | 2013-04-12 | 2013-10-23 | 西北大学 | Sewage treatment photocatalysis reactor |
| CN106927634B (en) * | 2017-04-10 | 2020-05-19 | 浙江省现代建筑设计研究院有限公司 | Hospital wastewater treatment system |
| CN107265558B (en) * | 2017-06-20 | 2022-11-08 | 天津大学 | Oily sewage purification device based on photocatalysis and electrolysis technology |
| CN107162309B (en) * | 2017-07-04 | 2020-12-15 | 浙江海洋大学 | Emulsified petroleum wastewater treatment device based on temperature-sensitive magnetic nano material |
| CN108101281A (en) * | 2017-12-20 | 2018-06-01 | 上海康盛环保能源科技有限公司 | A kind of catalytic ceramics membrane reactor |
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