CN104492235A - Method and device for treating industrial waste gas - Google Patents
Method and device for treating industrial waste gas Download PDFInfo
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- CN104492235A CN104492235A CN201410776736.8A CN201410776736A CN104492235A CN 104492235 A CN104492235 A CN 104492235A CN 201410776736 A CN201410776736 A CN 201410776736A CN 104492235 A CN104492235 A CN 104492235A
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Abstract
The invention discloses a method and a device for treating industrial waste gas. The method comprises the following step of irradiating substances containing volatile organic compounds with ultraviolet light. The device comprises a sewage collection tank, wherein sewage purifying ultraviolet lamps are mounted on the inner walls of the sewage collection tank and each ultraviolet lamp is an ultraviolet emitting lamp which can emit the ultraviolet light wave in C band and with the wavelength of 184.8-185.2nm and irradiation intensity of 45-47 uw/cm<2>. The method is suitable for large-scale industrial application and has much higher photocatalytic efficiency than that of the common TiO2 photocatalyst.
Description
Technical field
The present invention relates to a kind of method and apparatus processing industrial waste gas, the C section ultraviolet light (wavelength 184.8-185.2nm) especially in employing ultraviolet light-wave band is at specific modification TiO
2catalyst processes the method and apparatus of industrial waste gas, trade effluent under existing.
Technical background
Industrial waste gas, trade effluent, volatile organic matter especially wherein, is the important pollutant causing haze, has had a strong impact on air quality, animal and plant growth and human health, and have very serious potential safety hazard.The industrial chemicals composition used in the factory such as various chemical industry, fuel, oil, iron and steel, papermaking is various, cause trade effluent complicated component, often reach tens kinds of even hundreds of kinds, and be divided into again organic matter class and inorganic matter class, existing mode is selected the sewage centralized collection in factory often, unified discharge again, this super amount sewage discharge, very big destruction is caused to surrounding environment, especially peculiar smell wherein and objectionable impurities, have a strong impact on the normal life of nearby residents especially, and do not have special UV-device to process trade effluent at present.It is mainly derived from the major pollutants in the industry discharging waste gas such as petroleum chemical industry, plasthetics production, printing industry, insulating materials, machinery industry, surface anticorrosion antirust treatment, pharmaceuticals industry.
Volatile organic matter mostly has toxicity and with stench, some also has carcinogen, as vinyl chloride, benzene,toluene,xylene etc.And most volatile organic matter is inflammable and explosive, this produces enterprise and brings many unsafe factors.At present, corresponding decree has all been promulgated in countries in the world, limits the discharge of this pollutant.U.S.'s " Cleaning Air method " emphasizes the discharge that will reduce by 189 kinds of toxic chemicals 90% within the coming years, and wherein the chemicals of 70% is VOC; " discharge standard of air pollutants " that China enacted and enforced in 1997, limits the discharge limitation of 33 kinds of pollutants, comprising there being the multiple volatile organic matter such as benzene, dimethylbenzene.
Conventional absorption method and absorption process be polluter from gas phase to solid phase/transfer of liquid phase, there is secondary pollution problem; Purification biotechnology is that microorganism is under adapt circumstance condition, the organic principle in waste gas is utilized to sustain life activity as the energy, and be carbon dioxide, water, inorganic salts etc. by organic substance decomposing, living environment due to microorganism is special and treatment cycle is long, utilize biotechnology cleaning organic waste gas only to achieve successfully in laboratory, almost do not obtain practical application at present; Catalytic burning method is the VOCs treatment mode that catalytic efficiency is the highest, can reach the purifying rate of 100% in theory, but processes waste gas using the metallic catalyst of costliness as consumptive material and make most of enterprise all cannot accept this type of processing mode.
Photocatalyst has outstanding advantage in this respect.Photohole in photoactivation semiconductor valence band, photocatalytic oxidation is due to the strong oxidizing property of photohole, as titanium dioxide, its current potential is 3.2 v, more much higher than 2.07 v of ozone, energy is degradable organic pollutant thoroughly, makes it permineralization and generates carbon dioxide and water, and agent does not almost have selective, so many pollutant mineralisings (inorganization) being difficult to degrade can be made.Degradation process can be carried out at normal temperatures and pressures, does not need to add chemical reagent, non-secondary pollution, the advantage such as easy and simple to handle and receiving publicity.
CN101279250A discloses a kind of nonmetal nitrogen intermingle with one-dimensional structure TiO of support type that can be used in excited by visible light
2photochemical catalyst and preparation method.With metal Ti sheet and concentrated alkali solution for primary raw material, use hydrothermal technique, obtain the nonmetal nitrogen intermingle with one-dimensional structure TiO of support type by acidifying, ion-exchange and subsequent heat treatment
2visible light catalyst.It is characterized in that mixing of nitrogen makes catalysis produce absorption to visible ray, absorbing wavelength red shift is to 600nm; Catalyst is support type inherently, solves pellet type catalyst and holds caducous shortcoming; Catalyst has one-dimentional structure, and specific area is large, and active site position is enriched, and is conducive to strengthening reaction mass transfer process.Achieve the degraded to room air typical pollutant, its specific activity granular nitrogen doped Ti O
2exceed 1.2-3.0 doubly.
CN2774623A discloses a kind of novel photocatalysis air purifier, is made up of blower fan, uviol lamp, loaded catalyst bed and other attachment feature.Photocatalyst coating is in the circle be parallel to each other or square spacer plate of one group of band breach or passage, tubular UV lamp is through baffle assembly center, the breach of adjacent separator or blow vent mutual dislocation, the outer of dividing plate and interior edge are respectively near clarifier inwall and ultraviolet lamp sleeve, make the light reaction constituting elongation in clarifier cavity interval, be also added with anion generator and ozone decomposition catalyst in air stream outlet section.
CN2809481 discloses the Double-chamber type nano photocatalytic air purifier that a kind of efficiency of light energy utilization is high, catalyst total surface area is large, it utilizes Nano semiconductor photocatalysis principle and characteristic ultraviolet, forms two tubular ring light-catalyzed reaction rooms by ultraviolet lamp, bassoon carrier and tubule carrier, upper support reticulum and lower support reticulum.Tubule carrier is glass material, and ultraviolet can pass, and bassoon carrier is ceramic material.Ring-type mesh on upper and lower support reticulum makes dual-reaction chamber become series winding, there is the comprehensive function of indoor air purification, sterilization and deodorizing, be applicable to the unproductive indoor places such as area is comparatively large, air quality requirements is high room, hotel, hotel, office, meeting room and ward.
CN1799687A discloses a kind of supported titanium
2photochemical catalyst and preparation method thereof, and with its obtained high adsorption photocatalytic water purifier.This supported titanium
2photochemical catalyst with activated carbon fiber base for matrix, load 100-600mgTiO thereon
2/ g activated carbon fiber, thick 100-300nm TiO
2film, specific area is 150 ~ 400m
2/ g.This catalyst obtains by the powder cladding process of adhesive, liquid phase deposition and sol-gel process.It remains original space between activated carbon fiber silk, has fluid and can free in and out photochemical catalyst inside, and the advantage of the radiation-curable inside to photochemical catalyst of ultraviolet light.Use above-mentioned supported titanium
2the photocatalytic water purifier of photochemical catalyst is rectangular-shaped, and multiple photochemical catalyst assembly being fixed with above-mentioned catalyst inserts in clarifier cell body, and the aerating system of bottom can gas mixing treatment fluid, reduces mass transfer restriction.This clarifier can effective adsorption reaction substrate, promotes photocatalytic process, makes it be particularly suitable for the deep purifying process of micro polluted source.
CN2529646A discloses a kind of photocatalysis air purifying device, is made up of body, switch controlling device, air circulation device, air filter and photocatalysis apparatus.In the passage that air purifier air flow is crossed, be provided with photocatalytic reaction device, and photocatalytic reaction device is made up of the light-catalyzed reaction film be attached on carrier and ultraviolet source.Light-catalyzed reaction film is the titanium deoxid film utilizing magnetically controlled sputter method to prepare on carrier, and carrier is glass, metal, pottery or silk screen.When air is by photocatalysis air cleaning device, the harmful substance in air such as formaldehyde, benzene etc. are degraded under light-catalysed effect, and generate nontoxic material, and the bacterium in air is also removed by ultraviolet light, therefore air is purified.This photocatalysis air purifying device can in the indoor use of family, also can in the indoor use of large space.
CN2621799A discloses a kind of photocatalysis air purifier ', comprise purifier shell, photochemical room and wind cycling mechanism is provided with in purifier shell, be provided with catalyst and lamp tube light source in this photochemical room housing, described lamp tube light source is fixedly connected on the front of described photochemical room housing.When changing light source, do not need photochemical room to take out from purifier shell, as long as open purifier shell and replaceable.In addition, light source can be regulated according to the arrangement of catalyst, improve catalytic effect.Finally, the fluorescent tube of this invention is convex, irradiates evenly.
CN2565456A discloses a kind of high efficient optical catalyst air purifier, this device is by taking from casing both sides air intake, adopt two groups of cross flow blowers, top to go out the versions such as wind scoop, three layers of photocatalyst filtering net and photocatalyst grizzly bar with air guiding grid plate, solve the contact surface problem of air velocity problems of liquid flow and air and photocatalyst body well; By adopting suitable photocatalyst material, solve photochemical catalyst fixation problem on the carrier well; By the ultraviolet lamp adopting ozone free to produce, solve ozone excessive problem well.The solution of these problems, improves air purification effect, improves purification of air quality.
" metalloporphyrin/isonicotinic acid/titanium dioxide composite photocatalyst preparation and Photocatalytic Performance Study thereof ", Luo Yun etc., Chinese Journal of Inorganic Chemistry, 28th volume the 6th phase, disclose in June, 2012 and synthesized tetraphenylporphyrin and copper porphyrin and zinc protoporphyrin, obtain complex ZnTPP, prepared titanium dioxide composite photocatalyst-metalloporphyrin/isonicotinic acid/titanium dioxide that metalloporphyrin, isonicotinic acid are co-modified, have studied the effect of its photocatalytic degradation water pollutant.
WO2006074697A1 discloses a kind of cage photochemical catalyst as environmental purifying agent, wherein be encapsulated in by nano-photocatalyst in calcium carbonate shell, this catalyst can be decomposed by photocatalysis and remove the harmful substance comprising volatile organic contaminant.
KR20030034590A discloses a kind of trapping and eliminates the method and apparatus of VOC in air, this device comprises air intake, outlet, pretreatment chamber, photochemical catalyst reative cell, multiple guide plate, multiple uviol lamp, and the surface of described guide plate is coated with based on TiO
2photochemical catalyst.
But there is the higher major defect of cost in the photocatalysis method at present for the treatment of organic pollution, is not suitable for large-scale industrial application, and general T iO
2the photo-quantum efficiency of photochemical catalyst and photocatalysis efficiency are all lower.
Summary of the invention
For solving the above-mentioned problems in the prior art, the present inventor, through further investigation and great many of experiments, proposes following technical scheme:
On the one hand, the invention provides a kind of method processing industrial waste gas, the method comprises with this industrial waste gas of UV-irradiation.
Described ultraviolet light is preferably the C section in ultraviolet light-wave band, wavelength 184.8-185.2nm, and irradiation intensity is 45-47 uw/cm
2.
Described method makes industrial waste gas and supported modified TiO under can being included in UV-irradiation
2catalyst exposure.
Preferably, described industrial waste gas comprises volatile organic matter from trade effluent.
In preferred at one, it makes industrial waste gas and supported modified TiO under being included in UV-irradiation
2catalyst exposure.
In the process of process volatile organic matter, in described trade effluent, add the supported modified TiO had based on sewage weighing scale 0.1-2.0%
2catalyst.
A particularly preferred method, supported modified TiO of the present invention
2catalyst is the modification TiO of inorganic matter (most preferably haydite) load
2catalyst.
Described haydite can be haydite obtained by the following method:
(1) by the mud of trade effluent (can be the industrial sewage of pending TREATMENT OF VOCs) in natural environment airing to moisture content lower than 10wt.%, then break process is carried out to it, mud granule fragmentation produced afterwards to be transferred in heating furnace at the temperature of 460-550 DEG C (preferably 500 DEG C) dry 10-25 minute (preferably 20 minutes), dried raw material is transferred in ball mill, ball-milling treatment 10-40 minute (preferably 30 minutes), drum's speed of rotation 500-700 rev/min (preferably 600 revs/min);
(2) in ball mill, add the pore creating material of the lime stone based on dried mud weighing scale 20-30 % by weight (preferably 20 % by weight), 5-10 % by weight (preferably 5 % by weight), continue ball milling and be dry mixed 5-10 minute (preferably 10 minutes), then mixed material is transferred in dosing chamber, the suitable quantity of water that adds water stirs, granulation, particle diameter is at the preferred 6mm of 5mm-15mm() in scope, then naturally dry;
(3) shot-like particle after drying is transferred in heating furnace, sinters at the temperature of 550 DEG C-650 DEG C (preferably 600 DEG C) 20-40 minute (preferably 30 minutes), naturally cool to room temperature, obtain haydite finished product.
Described pore creating material can be selected from rosin, sawdust, polystyrene, stalk, paper pulp and rice husk one or more.Preferred rosin, sawdust and polystyrene.More preferably from the polystyrene of waste plastics as building envelopes warming plate, thus more advantageously twice laid can be realized.If cost is not the principal element considered, can preferably rosin and polyamines or polyacid.Most preferably, can also add the solid infusion (based on dried mud weighing scale) of 1-5 % by weight, described solid infusion preferably has chemical formula RCNHCH
2the amide substance of OH, find that the solid infusion of this amide-type can act synergistically with described pore creating material (preferred rosin) unexpectedly, make the porosity that produces stable and haydite intensity is higher, such as haydite intensity can improve 20-40% than not using the solid infusion of amide-type.
Above-mentioned mud of the present invention can from the mud of trade effluent process acquisition further after removing volatile organic matter.Described processing method can be the conventional sewage processing method of this area.By utilizing the mud of trade effluent, discarded object can also be made to obtain further recycling.
The present inventor finds, there are many holes on the surface of obtained haydite and more regular, compared with general inorganic carrier such as bentonite, can with TiO
2in conjunction with more firm, the proportion of described haydite is 0.8-1.0g/cm in addition
3, comparatively close with the proportion of water, easily suspend in water, effectively can increase the intensity of illumination to catalyst, thus greatly improve catalytic effect.
Described modification TiO
2catalyst can be the TiO of doping La, Pt and Fe
2catalyst, wherein based on the total weight of catalyst, the doping of La is 0.1-0.5 % by weight, and it is with La
2o
3form exists; The doping of Fe is 0. 1-1.0 % by weight, and it is with Fe
2o
3form exists; The doping of Pt is 0.01-0.10 % by weight, and it exists with simple substance or adsorb oxygen form, is deposited on La
2o
3/ Fe
2o
3/ TiO
2surface, surplus is essentially TiO
2.
TiO
2adopt the sol-gel process preparation of this area routine, then flood the water soluble salt of La and Fe, after drying, carry out high-temperature calcination (300-600 DEG C), obtain doping La
2o
3and Fe
2o
3tiO
2catalyst, i.e. La
2o
3/ Fe
2o
3/ TiO
2, then by Photodeposition at La
2o
3/ Fe
2o
3/ TiO
2surface deposition Pt.
Described light deposition method can be as follows: by a certain amount of H
2ptCl
66H
2o is dissolved in the 1:4(volume ratio containing methyl alcohol and distilled water) in mixed solution, by La
2o
3/ Fe
2o
3/ TiO
2catalyst adds in this solution under stirring, regulates pH=about 3, fully mixes under magnetic stirring, then suspension is irradiated 6-10h under ultraviolet light, after reaction terminates, filters, spends deionized water number time, use AgNO
3solution detects Cl
-until produce without precipitation, 60-100 DEG C of dry 1-6h, the TiO of must adulterate La, Pt and Fe
2catalyst.
Can by obtained Pt/La
2o
3/ Fe
2o
3/ TiO
2catalyst is placed in certain water gaging, fully stirs obtained suspension, adds in this suspension by a certain amount of above-mentioned haydite obtained by mud, continue to stir, make haydite Surface coating have catalyst layer, then keep 1-5 hour at 200-400 DEG C, obtain the modification TiO of haydite load
2catalyst.Modification TiO
2the load capacity of catalyst is (based on haydite and modification TiO
2the total weight of catalyst) 0.1 % by weight-10.0 % by weight, preferably 0.5 % by weight-5.0 % by weight, more preferably 1.0 % by weight-5.0 % by weight.
The present inventor finds through large quantity research, and La doping can improve the visible light catalysis activity of catalyst, the La doping of 0.3 % by weight can 100 DEG C, basic major part removes vapor phase toluene in pharmaceuticals industry sewage and dimethylbenzene in 60min; The La mixed is with La
2o
3formal distribution at TiO
2surface, and form Ti-O-La key, suppress titanium dioxide Anatase to change to Rutile Type, improve phase transition temperature, reduce crystallite dimension and increase specific surface area of catalyst, La doping can improve TiO in addition
2in the absorption of visible region, catalyst adsorb limit is moved to long wave, by inference, the electron transition of the f track of La may be the major reason that catalyst visible light activity improves.
Mixing of Pt reduces crystallite dimension and increases specific surface area of catalyst, adds the absorption of catalyst to the 185nm wave band ultraviolet light in ultraviolet D wave band simultaneously.
The codope of La, Fe suppresses TiO
2crystal transfer and grain growth, the photo absorption performance of reinforced composite, improves the photocatalysis performance of this catalyst.
In preferred at one, the 185nm wave band ultraviolet light in ultraviolet D wave band is launched fluorescent tube by ultraviolet and is produced.Described fluorescent tube is by containing 6 wt.%-8 wt.% Na
2the clear glass luminous tube that the soda-lime-silica glass of O is made, described soda-lime-silica glass comprises:
| SiO 2 | 65-75wt.% |
| Na 2O | 6-8wt.% |
| CaO | 5-15wt.% |
| MgO | 1-5wt.% |
| Al 2O 3 | 3-8wt.% |
| K 2O | 6-8wt.% |
| SO 3 | 0.01-0.20wt.% |
| CeO 2 | 0.0010-0.0025wt.% |
| With Fe 2O 3Total iron of meter | 0.01-0.08wt.% |
| Redox ratio | Be less than 0.40 |
Wherein the spectral quality that records under 5.5 mm of thickness of this glass is as follows:
C.I.E. standard sources " A " is used to record with 2 ° of observers the transmissivity being greater than 90% in wavelength (ultraviolet) scope of 100-200 nm.The described ultraviolet wavelength transmitance of this soda-lime-silica glass than routine exceeds at least 20%.
On the other hand, the invention provides a kind of device processing industrial waste gas, described in comprise volatile organic matter material be trade effluent, it is characterized in that, described device comprises sewage collecting casing, and in described sewage collecting casing, wall is all provided with sewage purification ultraviolet lamp; This ultraviolet lamp be can C section in emitting ultraviolet light wave-wave section, for wavelength 184.8-185.2nm and irradiation intensity is 45-47 uw/cm
2ultraviolet launch fluorescent tube, fluorescent tube is by containing 6 wt.%-8 wt.% Na
2the clear glass luminous tube that the soda-lime-silica glass of O is made;
Preferably, described device comprises casing, waste gas purification lamp, lamp bracket track and controller, the two ends of described casing have air inlet and air outlet, described waste gas purification lamp and described lamp bracket track are installed in described casing, described waste gas purification lamp is arranged on described lamp bracket track, described controller is arranged on outside described casing, and is connected with waste gas purification lamp, and described waste gas purification lamp is above-mentioned ultraviolet lamp.
Described sewage collecting casing one end can be connected with cesspool, and described cesspool one end is connected with source of sewage; Entrance point and the port of export of described sewage collecting casing are equipped with filter, and the screen area of described filter is 500 ~ 1100cm
2, the mesh aperture of filter screen is 0.1-5.0mm.
Arrange bottom described cesspool and can have sedimentation basin, anti-backflow grid is installed between described cesspool and sedimentation basin.
The described sewage collecting casing other end can be provided with draining pump; Or described waste gas purification lamp comprises fluorescent tube, lamp bracket and ballast, described ballast and fluorescent tube are installed in inside described lamp bracket, and described ballast is connected with described fluorescent tube, and the fluorescent tube quantity of described ballast quantity preferably with described is equal;
Preferably, be coated with diaphragm outside described fluorescent tube, described diaphragm is anti-fading block media;
Preferably, described waste gas purification lamp is equal with described lamp bracket number of tracks, and minimum be one;
Preferably, the material that described casing, waste gas purification lamp and lamp bracket track are high temperature resistant, high pressure resistant, uvioresistant and ozone is made.
Accompanying drawing explanation
Fig. 1 is the structural representation of the device for the treatment of in accordance with the present invention industrial waste gas.
Fig. 2 is according to waste gas purification modulated structure schematic diagram of the present invention.
detailed description of the invention:
embodiment 1
Get 100g TiO
2, TiO
2the sol-gel process of this area routine can be adopted to prepare (being calcined 2 hours at 500 DEG C by the colloidal sol obtained after Titanium alkoxides hydrolysis), or be purchased from Aldrich-Sigma company, then the nitrate aqueous solution of La and Fe is flooded, its concentration is 1.0mmol/L, dip time is 1.0 hours, then dry at 100 DEG C, then carry out 500 DEG C of high-temperature calcinations, obtain doping La
2o
3and Fe
2o
3tiO
2catalyst and La
2o
3/ Fe
2o
3/ TiO
2, then by Photodeposition at La
2o
3/ Fe
2o
3/ TiO
2surface deposition Pt.
Described light deposition method can be as follows: get a certain amount of H
2ptCl
66H
2o is dissolved in the 1:4(volume ratio containing methyl alcohol and distilled water) in mixed solution, by La
2o
3/ Fe
2o
3/ TiO
2catalyst adds in this solution under stirring, and regulate pH=3, fully mix under magnetic stirring, then suspension irradiates 8h under ultraviolet light, after reaction terminates, filters, spends deionized water multipass, use AgNO
3solution detects Cl
-until produce without precipitation, 80 DEG C of dry 3h, the TiO of must adulterate La, Pt and Fe
2catalyst, wherein based on the total weight of catalyst, the doping of La is 0.2 % by weight, and it is with La
2o
3form exists; The doping of Fe is 0.5 % by weight, and it is with Fe
2o
3form exists; The doping of Pt is 0.02 % by weight, and it exists with simple substance form, and is deposited on La
2o
3/ Fe
2o
3/ TiO
2surface.By obtained Pt/La
2o
3/ Fe
2o
3/ TiO
2catalyst is placed in 5L water, fully stirs obtained suspension, adds in this suspension by 2kg according to the haydite that method mentioned above is obtained by mud, continue to stir, make haydite Surface coating have catalyst layer, then keep 1 hour at 300 DEG C, obtain the modification TiO of haydite load
2catalyst, modification TiO
2the load capacity of catalyst is 4.5 % by weight.
embodiment 2
As shown in Figure 1, a kind of industrial sewage purification device, comprises sewage collecting casing 3, and in described sewage collecting casing 3, wall is all provided with sewage purification ultraviolet lamp 4; Described sewage collecting casing 3 one end is connected with cesspool 2, and described cesspool 2 one end is connected with source of sewage 1; Be provided with sedimentation basin 7 bottom described cesspool 2, between described cesspool 2 and sedimentation basin 7, anti-backflow grid 6 be installed; Described sewage collecting casing 3 other end is provided with draining pump 5.
Its course of work is as follows: sewage enters cesspool 2 through source of sewage 1, precipitate in cesspool 2, larger solid pollutant and particle enter sedimentation basin 7 through precipitation, residue sewage enters sewage collecting casing 3 through cesspool 2, supported modified TiO prepared by the embodiment 1 being incorporated as sewage weight 0.8% in collection tank 3
2catalyst, through the Ultraviolet radiation that ultraviolet lamp 4 produces, becomes ozone by the oxygen photodissociation in the sewage in sewage collecting casing 3, and the organic substance in ozone and sewage combines, and decomposes and be oxidized the pollutant in sewage.Sewage after purification pumps discharge by draining pump 5, makes it meet national environmental protection examination criteria.As shown in Figure 2, waste gas purification lamp comprises fluorescent tube 9, lamp bracket 10 and ballast 11, and ballast 11 and fluorescent tube 9 are installed in inside lamp bracket 10, and ballast 11 is connected with fluorescent tube 9.
Test with the trade effluent that certain pharmaceutical factory produces, this trade effluent contains toluene, adopts the toluene level of gas-chromatography to the sewage of import and outlet to detect, and chromatogram is that 7890 II gas chromatographs detect toluene concentration change.GC conditions: adopt capillary column (50m × 0.32mm × 0.5 μm, Shimadzu Corporation), fid detector, detector temperature 150 DEG C, column temperature 110 DEG C, injector temperature 130 DEG C.After testing, the photocatalytic activity (clearance) of toluene is 82.5%.
comparative example 1
With the difference of embodiment 2, comparative example 1 is only that catalyst is common non-load non-modified TiO2 photochemical catalyst.After testing, the photocatalytic activity of toluene is 52.5%.
comparative example 2
With the difference of embodiment 2, comparative example 2 is only that the carrier of catalyst is common potter's clay.After testing, the photocatalytic activity of toluene is 61.4%.
As can be seen from the above results contrast clearly, supported modified TiO of the present invention
2catalyst significantly can improve photocatalysis efficiency, and such effect is that those skilled in the art institute is unforeseeable.
The open the present invention of this written description use-case, comprises optimal mode, and also enables those skilled in the art manufacture and use the present invention.Of the present inventionly the scope of granted patent can be defined by the claims, and other example that those skilled in the art expect can be comprised.If other example this has the structural element of the literal language not differing from claims, if or other example this comprises and the equivalent structure element of the literal language of claims without substantial differences, then other example this is intended to be within the scope of claims.Can not cause under inconsistent degree, be incorporated herein by reference to by all references part of reference herein.
Claims (10)
1. process a method for industrial waste gas, the method comprises with industrial waste gas described in UV-irradiation.
2. method according to claim 1, wherein said ultraviolet light is the C section in ultraviolet light-wave band, wavelength 184.8-185.2nm, and irradiation intensity is 45-47 uw/cm
2.
3., according to the method for claim 1 or 2, it makes industrial waste gas and supported modified TiO under being included in UV-irradiation
2catalyst exposure.
4. the method any one of aforementioned claim, wherein said industrial waste gas is from trade effluent and comprise volatile organic matter.
5. the method any one of aforementioned claim, the 185nm wave band ultraviolet light in wherein said ultraviolet D wave band is launched fluorescent tube by ultraviolet and is produced, and wherein said fluorescent tube is by containing 6 wt.%-8 wt.% Na
2the clear glass luminous tube that the soda-lime-silica glass of O is made.
6. the method any one of aforementioned claim, the modification TiO of wherein said load
2the carrier of catalyst is inorganic matter.
7. process a device for industrial waste gas, described in comprise volatile organic matter material be trade effluent, it is characterized in that, described device comprises sewage collecting casing, and in described sewage collecting casing, wall is all provided with sewage purification ultraviolet lamp; This ultraviolet lamp be can C section in emitting ultraviolet light wave-wave section, for wavelength 184.8-185.2nm and irradiation intensity is 45-47 uw/cm
2ultraviolet launch fluorescent tube, fluorescent tube is by containing 6 wt.%-8 wt.% Na
2the clear glass luminous tube that the soda-lime-silica glass of O is made;
Preferably, described device comprises casing, waste gas purification lamp, lamp bracket track and controller, the two ends of described casing have air inlet and air outlet, described waste gas purification lamp and described lamp bracket track are installed in described casing, described waste gas purification lamp is arranged on described lamp bracket track, described controller is arranged on outside described casing, and is connected with waste gas purification lamp, and described waste gas purification lamp is above-mentioned ultraviolet lamp.
8. device according to claim 7, is characterized in that, described sewage collecting casing one end is connected with cesspool, and described cesspool one end is connected with source of sewage; Entrance point and the port of export of described sewage collecting casing are equipped with filter, and the screen area of described filter is 500 ~ 1100cm
2, the mesh aperture of filter screen is 0.1-5.0mm.
9. according to the device of claim 7 or 8, it is characterized in that, bottom described cesspool, be provided with sedimentation basin, anti-backflow grid is installed between described cesspool and sedimentation basin.
10. the device according to claim 7 or 8, is characterized in that, the described sewage collecting casing other end is provided with draining pump; Or described waste gas purification lamp comprises fluorescent tube, lamp bracket and ballast, described ballast and fluorescent tube are installed in inside described lamp bracket, and described ballast is connected with described fluorescent tube, and the fluorescent tube quantity of described ballast quantity preferably with described is equal; In addition:
Preferably, be coated with diaphragm outside described fluorescent tube, described diaphragm is anti-fading block media;
Preferably, described waste gas purification lamp is equal with described lamp bracket number of tracks, and minimum be one;
Preferably, the material that described casing, waste gas purification lamp and lamp bracket track are high temperature resistant, high pressure resistant, uvioresistant and ozone is made.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108164258A (en) * | 2017-12-22 | 2018-06-15 | 中国海诚工程科技股份有限公司 | Landfill leachate short-cut denitrification decarbonizing technology based on biological stephanoporate ceramic microsphere |
| CN108333002A (en) * | 2017-12-22 | 2018-07-27 | 北京林业大学 | VOC harvesters, VOC acquisition methods |
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| CN108333002A (en) * | 2017-12-22 | 2018-07-27 | 北京林业大学 | VOC harvesters, VOC acquisition methods |
| CN108333002B (en) * | 2017-12-22 | 2020-09-29 | 北京林业大学 | VOC (volatile organic compound) acquisition device and VOC acquisition method |
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| CN104492235B (en) | 2017-04-05 |
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