CN102583638B - Water treatment device based on mechanism of photocatalysis reaction of nano-crystalline titanium dioxide fiber - Google Patents
Water treatment device based on mechanism of photocatalysis reaction of nano-crystalline titanium dioxide fiber Download PDFInfo
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Abstract
The invention discloses a water treatment device based on a mechanism of a photocatalysis reaction of nano-crystalline titanium dioxide fiber. The water treatment device comprises photocatalysis reactors of the nanocrystalline titanium dioxide fiber, a water storage tank, a water pump, a first valve, a second valve, a flow meter, a spraying and aerating head, a water outlet pipe and a connecting pipe. The water treatment device has the advantages that multiple stages of square body type reactors are stacked together to realize equal-path parallel circulating water treatment, the number of the reactors can be conveniently increased and reduced, the efficiency of a photocatalysis circulating water treatment is high due to the adoption of a parallel mechanism, and the continuity is strong; ultraviolet lamps are horizontally placed above the reactors and parabola-shaped lampshades are adopted, so that light can be vertically incident into liquid levels to the maximal extent; as parallel clapboards are arranged, the flow rates of water flows in the reactions are obviously reduced, breakage and loss of the fiber, which are caused by overlarge impact of the water flows, are effectively avoided, and the strokes of the water flows in different time segments are uniform; and the water treatment device can be applied to large-flow dynamic continuous water treatment, makes large-scale treatment of industrial wastewater containing organic pollutants possible, has a simple structure, requires a low cost and has a broad prospect.
Description
Technical field
The invention belongs to the organic pollutant wastewater process field, particularly a kind of water treatment device based on nano-crystalline titanium dioxide fiber optic mechanism of catalytic reaction.
Background technology
Nearly 40 years of relevant optically catalytic TiO 2 Study on Technology, and obtained significant progress in several years.Compare with the leading nation of this technology, also there is no small gap in China in processing and the application facet of nano titanium oxide.But the titanium resource of China is abundant, occupies first of the whole world, and its reserves account for 45% of the whole world, and the purposes of nano titanium oxide is very extensive, there is vast market prospect, therefore, develops the nano titanium oxide related products of high added value as early as possible and be very necessary and urgent with its application.
Semiconductor light-catalyst is n N-type semiconductorN material mostly, all has the special energy band structure that is different from metal or megohmite, namely has a forbidden band between valence band and conduction band.Because semi-conductive photoabsorption threshold value and band gap have the relation of formula K=1240/Eg (eV), therefore the absorbing wavelength threshold value of wide band gap semiconducter commonly used is mostly at ultraviolet region.Under UV-irradiation, photon energy is higher than the rayed semi-conductor that semi-conductor absorbs threshold value, and semi-conductive valence band electronics generation band-to-band transition namely transits to conduction band from valence band, thereby produces light induced electron (e-) and hole (h+).The dissolved oxygen trapped electron that is adsorbed on nano grain surface this moment forms superoxide anion, and the hole will be adsorbed on hydroxide ion and the water of catalyst surface and be oxidized to hydroxyl free radical.And superoxide anion and hydroxyl free radical are universally acknowledged strong oxidizers, fast non-selectivity ground with the overwhelming majority's oxidation operation to final product CO
2And H
2O
2, even also can thoroughly decompose some inorganicss, and can kill bacterium and virus in the water rapidly, and not bring secondary pollution.The conductor photocatalysis oxidation operation is simple, and energy consumption is low, and economic benefit and obvious environment benefit so have a high potential in water treatment field, have a extensive future.
The water treatment procedure complexity of reality in the industry, work under bad environment.Thereby the performance of semiconductor light-catalyst there is very high requirement.In numerous semiconductor light-catalysts, titanium dioxide because of its good photocatalysis property, good chemical stability and anticorrosive, nontoxic, do not have series of advantages such as secondary pollution, aspect Treatment of Industrial Water, demonstrate very tempting prospect, enjoy and pay attention to and concern.
The traditional application form of titanium dioxide is mainly nano powder, film and load, but all has the defective that is difficult to overcome.Though as nano powder in water can with the liquid full contact, reaction back is big with the water sepn recovery difficult; Though film and load have solved the reaction back and have reclaimed difficult problem, its specific surface area and active low, easily come off, therefore greatly limited the practical application of titanium dioxide.As a kind of new application form of titanium dioxide, the nano-crystalline titanium dioxide fiber provides a kind of feasible scheme for a difficult problem that solves above-mentioned actual application.Fiber has that Young's modulus is big, and plastic deformation is little, characteristics such as intensity height.The great fibre shape advantage of its length-to-diameter ratio, can design easily with the fiber is the filling type reactor of carrier.Under the illumination of ultraviolet lamp, the water fiber generation light-catalyzed reaction of directly flowing through, the directly separation of reaction back.The body of fiber is the polycrystal tissue of titanium dioxide nanocrystalline grain and the coexistence of nanometer pore, because of the characteristics of its nanoscale, so specific surface area is big, and the photocatalytic activity height.Meanwhile, fiber is the distributed in three dimensions state that dispersion interweaves in water, water sees through the gap reaction with UV-light in process of flowing, contact area is big, the catalytic efficiency height, so the application of nano-crystalline titanium dioxide fiber is expected to realize the dynamic water technology of high-efficiency and continuous, create good economy and environmental benefit, have important application value.Patent of invention CN.200410024265.1 and CN.201010144227.5 have disclosed the nano-crystalline titanium dioxide fiber preparation method, and authorized, efficiently solve the source problem that comes of material.
But realize the dynamic nano-crystalline titanium dioxide fiber optic catalytic treatment of high-efficiency and continuous, at first to carry out the structure innovation optimization design of photo catalysis reactor, making it has good catalytic effect to the nano-crystalline titanium dioxide fiber, based on reactor, set of systems is synthesized a kind of circulating water treatment technology of efficient stable then.
When carrying out the structure innovation optimization design of nano-crystalline titanium dioxide photo catalysis reactor and circulating water treatment technology efficiently, need emphasis to consider following problem: 1. how to maximally utilise UV-light, reduce the loss of light, realize that light is at reactor uniform irradiation liquid level; 2. how to guarantee different current degree unanimities under photochemical catalysis constantly in the reactor, it is handled evenly; Speed when 3. how to reduce current effectively and contacting with fiber in reactor delays the light-catalyzed reaction time, avoid simultaneously fiber because of current too urgent and disconnected broken, run off; 4. how to design simple in structure, reactor cheaply, make it to have stronger practical application.
At present the technology of this respect as yet can be not all and is solved these crucial problems well.Titania fiber photocatalytic reaction device as disclosed several types such as patent CN.200720030678, CN.201010105477.8, do not fully take into account when big water impact fiber, especially at water outlet, water flow velocity is sharply accelerated, very easily by disconnected broken, leakage is serious for fiber; UV-irradiation adopts Optical Fiber Transmission, the cost height, and technical difficulty is big, and optical loss is obvious.Patent CN.201010503062.6 etc. place reaction solution central authorities to ultraviolet source, though realized taking full advantage of of UV-light, but the outside need add a silica tube with the protection ultraviolet lamp tube, and the impurity absorption behind the certain hour in the organic waste water has obviously hindered the irradiation of UV-light on the silica tube surface; Reactor mostly is closed system, and the filling of fiber is very inconvenient with replacing; Existing reactors global design complex structure, the technical requirements height, it is big to promote difficulty, and actual application prospect is uncertain.In addition, add hydrogen peroxide oxidant and can improve light-catalysed effect significantly, above-mentioned patent is not all considered.Existing technology does not have the ripe complete standard technology that utilizes the catalysis of nano-crystalline titanium dioxide fiber optic to carry out circulating water treatment as yet.Therefore, the UV-light that how will be positioned at the liquid level top is able to the utilization of fullest, and the problems such as DESIGN OF REACTOR of open system become the key of nano-crystalline titanium dioxide fiber optic catalyticreactor innovation.
Summary of the invention
The object of the present invention is to provide a kind of big flow that is applicable to, can effectively prevent fiber loss, take full advantage of UV-light, can open even fiberfill fibers, realize a kind of water treatment device based on nano-crystalline titanium dioxide fiber optic mechanism of catalytic reaction of multistage parallel circulation.
Realize that technical solution of the present invention is: a kind of water treatment device based on nano-crystalline titanium dioxide fiber optic mechanism of catalytic reaction, comprise n nano-crystalline titanium dioxide fiber optic catalyticreactor, water pump, tank, pipe connecting, first valve, second valve, under meter, spray aeration head and rising pipe, n is more than or equal to 1; Wherein, the tank water outlet links to each other with pump intake, pump outlet is divided into two-way, wherein left road is connected with first valve, right wing links to each other with second valve, first valve links to each other with the under meter water-in, the under meter water outlet links to each other with nano-crystalline titanium dioxide fiber optic catalyticreactor water-in, nano-crystalline titanium dioxide fiber optic catalyticreactor water outlet links to each other with next stage nano-crystalline titanium dioxide fiber optic catalyticreactor water-in by pipe connecting, form circulation with this, linked to each other with tank by rising pipe by last step nano-crystalline titanium dioxide fiber optic catalyticreactor water outlet, second valve links to each other with the spray aeration head, and the spray aeration head is positioned at the tank top; The nano-crystalline titanium dioxide fiber optic catalyticreactor side of comprising precursor reactant groove, monolateral porous cloth stream dividing plate, porous cloth stream plate, the automatic supply transfer lime of oxygenant, ultraviolet lamp, parabolic type aluminum lampshade, nano-crystalline titanium dioxide fiber optic catalyticreactor water-in and nano-crystalline titanium dioxide fiber optic catalyticreactor water outlet; The top of precursor reactant groove inside, the parabolic type aluminum lampshade side of being positioned at wherein, ultraviolet lamp is placed horizontally at the axial focus place of parabolic type aluminum lampshade; The automatic supply transfer lime of oxygenant is placed horizontally at the below at parabolic type aluminum lampshade edge; Monolateral porous cloth stream dividing plate equidistantly vertically in the side's of embedding precursor reactant groove, is parallel to each other, and the porous cloth of adjacent separator stream part position opposite; Porous cloth stream plate is between the monolateral porous cloth stream dividing plate of nano-crystalline titanium dioxide fiber optic catalyticreactor water inlet oral-lateral and square precursor reactant groove cell wall, with monolateral porous cloth stream divider upright; Evenly fill the nano-crystalline titanium dioxide fiber between the adjacent monolateral porous cloth stream dividing plate; Nano-crystalline titanium dioxide fiber optic catalyticreactor water-in and nano-crystalline titanium dioxide fiber optic catalyticreactor water outlet are arranged in one side that monolateral porous cloth stream dividing plate does not have hole.
The present invention compared with prior art, its remarkable advantage:
1, low liquid level, large-area reactor layout.In theory, the liquid layer meeting absorb light between light source and catalyzer, scattered light, and the photoabsorption of catalyzer is weakened.Therefore, select low liquid level for use, large-area reactor layout is immersed in titania fiber in the liquid basically near the dipped beam face of liquid, has significantly reduced the photoabsorption obstacle, has improved catalytic effect and efficient.Compare with traditional closed reactor, open cubic type reactor makes that the filling of titania fiber is even more, it is convenient to change.
2, adopt Parabolic aluminum lampshade, utilize the distinctive curve character of para-curve, reflected light vertical incidence liquid level.Both reduce the loss of UV-light, increased substantially the utilization ratio of light, overcome the problem that the horizontal fluorescent tube is placed the light serious waste phenomenon, made UV-light uniform irradiation liquid level again.Simultaneously, the setting of lampshade has effectively reduced phlegma and has been back on the ultraviolet lamp tube, has improved the work-ing life of ultraviolet lamp.
3, a series of special parallel baffles are provided with specific path for the current that advance.The stroke of winding type had both significantly reduced flow velocity, defined the position of fiber again, and the relative movement of fiber can be ignored in narrow scope, and current are fully passed fibre gap generation light-catalyzed reaction.Simultaneously, effectively avoided fiber because of excessive and disconnected broken, the loss of current.Porous cloth stream plate, reduction of speed one by one that the edge of each dividing plate all is processed into.Like this, the control problem of the interior flow velocity of whole photo catalysis reactor is solved effectively.Dividing plate has also guaranteed the stroke unanimity of different moment current light-catalyzed reaction in reactor, and degree for the treatment of is suitable, and the water treatment homogeneity improves greatly.
4, fully take into account hydrogen peroxide to the contribution of reaction efficiency, the while is to the automatic supply hydrogen peroxide of reaction solution in the water treatment procedure.To make pipeline by oneself and place the liquid level top, hold a certain amount of hydrogen peroxide.Determine the size of aperture on the pipeline as required, hydrogen peroxide splashes in the reaction solution of below catalyzed reaction automatic slowly under the effect of gravity.
5, the reactor based on nano-crystalline titanium dioxide fiber optic mechanism of catalytic reaction of the present invention is selected the reaction vessel of cubes formula for use, compares with traditional cylindrical reactor vessel, and cost of manufacture obviously reduces, and difficulty of processing significantly reduces.Simultaneously, assemble simplyr, the utilization ratio of physical space increases substantially.
6, of the present invention based on nano-crystalline titanium dioxide fiber optic mechanism of catalytic reaction etc. the parallel circulating water treatment device of the folded formula of journey and technology, have handiness and the efficient of height.Can according in the actual water treatment to the requirement of index, the number of on-off reaction device is reassembled into the complete water treatment device of a cover easily.Compare with the circulation of traditional single-stage, the water treatment mechanism of parallel circulation has significantly improved efficient and the treatment effect of water treatment.Can carry out the dynamically water treatment operation continuously of big flow, system stability and treatment effect are fine, have important application value.
Below in conjunction with accompanying drawing the present invention is described in further detail.
Description of drawings
Fig. 1 is the overall structure synoptic diagram that the present invention is based on the water treatment device of nano-crystalline titanium dioxide fiber optic mechanism of catalytic reaction;
Fig. 2 the present invention is based on parabolic type lampshade ultraviolet light principle of reflection synoptic diagram in the nano-crystalline titanium dioxide fiber optic catalyticreactor of water treatment device of nano-crystalline titanium dioxide fiber optic mechanism of catalytic reaction;
Fig. 3 the present invention is based in the nano-crystalline titanium dioxide fiber optic catalyticreactor of water treatment device of nano-crystalline titanium dioxide fiber optic mechanism of catalytic reaction monolateral porous cloth stream dividing plate efficiently to subtract stream, the firm principle schematic of fiber.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
A kind of water treatment device based on nano-crystalline titanium dioxide fiber optic mechanism of catalytic reaction, comprise n nano-crystalline titanium dioxide fiber optic catalyticreactor, water pump 1, tank 2, pipe connecting 3, first valve 4, second valve 5, under meter 6, spray aeration head 7 and rising pipe 8, n is more than or equal to 1; Wherein, tank 2 water outlets link to each other with water pump 1 water-in, water pump 1 water outlet is divided into two-way, wherein left road is connected with first valve 4, right wing links to each other with second valve 5, first valve 4 links to each other with under meter 6 water-ins, under meter 6 water outlets link to each other with nano-crystalline titanium dioxide fiber optic catalyticreactor water-in 15, nano-crystalline titanium dioxide fiber optic catalyticreactor water outlet 16 links to each other with next stage nano-crystalline titanium dioxide fiber optic catalyticreactor water-in 15 by pipe connecting 3, form circulation with this, linked to each other with tank 2 by rising pipe 8 by last step nano-crystalline titanium dioxide fiber optic catalyticreactor water outlet 16, second valve 5 links to each other with spray aeration head 7, and spray aeration head 7 is positioned at tank 2 tops; The nano-crystalline titanium dioxide fiber optic catalyticreactor side of comprising precursor reactant groove 9, monolateral porous cloth stream dividing plate 10, porous cloth stream plate 11, the automatic supply transfer lime 12 of oxygenant, ultraviolet lamp 13, parabolic type aluminum lampshade 14; The top of precursor reactant groove 9 inside, parabolic type aluminum lampshade 14 side of being positioned at wherein, ultraviolet lamp 13 is placed horizontally at the axial focus place of parabolic type aluminum lampshade 14; The automatic supply transfer lime 12 of oxygenant is placed horizontally at the below at parabolic type aluminum lampshade 14 edges; Monolateral porous cloth stream dividing plate 10 equidistantly vertically in the side's of embedding precursor reactant groove 9, is parallel to each other, and the porous cloth of adjacent separator stream part position opposite; Porous cloth stream plate 11 is between the monolateral porous cloth stream dividing plate 10 of nano-crystalline titanium dioxide fiber optic catalyticreactor water-in 15 sides and square precursor reactant groove 9 cell walls, and is vertical with monolateral porous cloth stream dividing plate 10; Evenly fill the nano-crystalline titanium dioxide fiber between the adjacent monolateral porous cloth stream dividing plate 10; Nano-crystalline titanium dioxide fiber optic catalyticreactor water-in 15 is arranged in one side that monolateral porous cloth stream dividing plate 10 does not have hole with nano-crystalline titanium dioxide fiber optic catalyticreactor water outlet 16.
Nano-crystalline titanium dioxide fiber optic catalyticreactor water-in 15 has all been laid the cotton filtering layer 17 of one deck organic fibre with nano-crystalline titanium dioxide fiber optic catalyticreactor water outlet 16; Laying between the monolateral porous cloth stream dividing plate 10 is spaced apart 8-10cm; Laying between the porous cloth stream plate 11 is spaced apart 6-8cm; The automatic supply transfer lime 12 of oxygenant is arranged in the both sides of the edge of parabolic type aluminum lampshade 14; Monolateral porous cloth stream dividing plate 10 is rectangle, and the width of length and square precursor reactant groove 9 adapts, and height 8-10cm arranges hole at a lateral edges 1/5 place of monolateral porous cloth stream dividing plate 10; Porous cloth stream plate 11 height are consistent with monolateral porous cloth stream dividing plate 10, evenly lay a series of holes.
The top of parabolic type aluminum lampshade 14 side's of being fixed in precursor reactant grooves 9 places its axial focus place with ultraviolet lamp 13, namely on the sea line that it is parabolic with vertically all focuses of cross section parabolic type intersection constitute.Take full advantage of para-curve and pass through the light vertical reflection of focus to this geometric properties of top of liquid level, make light uniform irradiation nano-crystalline titanium dioxide fiber, light-catalyzed reaction takes place.
A series of square precursor reactant grooves 9 that pile up are rectangular parallelepiped, pile up conveniently, stablize, and make simple.
The automatic supply transfer lime 12 of oxygenant is placed horizontally at the liquid level top, and is parallel with ultraviolet lamp 13, realizes effective catalyst H
2O
2Automatic supply conveying function, according to the light-catalysed reaction mechanism of nano-crystalline titanium dioxide fiber, significantly improved the efficient of light-catalyzed reaction.
One end of monolateral porous cloth stream dividing plate 10 contains porous cloth stream part, forms the current forward stroke of winding type, realizes slowing down one by one.The porous cloth stream plate 11 that the low order end radial symmetry distributes has significantly reduced from nano-crystalline titanium dioxide fiber optic catalyticreactor water-in 15 current, reaches the purpose of even step stream; Between equally spaced monolateral porous cloth stream dividing plate 10, fill the nano-crystalline titanium dioxide fiber, define the position of fiber effectively, light-catalyzed reaction fully takes place in the scatter gap that current pass the nano-crystalline titanium dioxide fibre three-dimensional, and simultaneously open layout makes that the replacing of the filling of nano-crystalline titanium dioxide fiber and fiber is convenient.
Everywhere nano-crystalline titanium dioxide fiber optic catalyticreactor water-in 15 has all been laid the cotton filtering layer 17 of one deck organic fibre with nano-crystalline titanium dioxide fiber optic catalyticreactor water outlet 16, circulating water treatment through N level nano-crystalline titanium dioxide fiber optic catalyticreactor has reached the purpose of filtering layer by layer.
In conjunction with Fig. 1, the present invention is based on the circulating water treatment device of nano-crystalline titanium dioxide fiber optic catalyticreactor, constitute water-flow circuit by nano-crystalline titanium dioxide light-catalyzed reaction combiner, water pump 1, tank 2, pipe connecting 3, first valve 4, second valve 5, under meter 6, spray aeration head 7, rising pipe 8; Wherein, tank 2 water outlets are connected with water pump 1 water-in, water pump 1 water outlet is divided into two-way, wherein one the tunnel is connected with first valve 4, another road is connected with second valve 5, first valve 4 links to each other with under meter 6 water-ins, under meter 6 water outlets link to each other with nano-crystalline titanium dioxide fiber optic catalyticreactor water-in 15, the nano-crystalline titanium dioxide fiber optic catalyticreactor water outlet 16 of last step leads to tank 2 tops by pipe water outlet 8, second valve 5 links to each other with spray aeration head 7, and spray aeration head 7 is positioned at tank 2 tops.
Nano-crystalline titanium dioxide fiber optic catalyticreactor is by square precursor reactant groove 9, monolateral porous cloth stream dividing plate 10, porous cloth stream plate 11, the automatic supply transfer lime 12 of oxygenant, ultraviolet lamp 13, parabolic type lampshade 14, nano-crystalline titanium dioxide fiber optic catalyticreactor water-in 15, nano-crystalline titanium dioxide fiber optic catalyticreactor water outlet 16, the cotton filtering layer 17 of organic fibre, pipe connecting 3 constitutes, it specifically is configured to: monolateral porous cloth stream dividing plate 10 is arranged in parallel in square precursor reactant groove 9 bottoms, porous cloth stream plate 11 is arranged in deflection nano-crystalline titanium dioxide fiber optic catalyticreactor water-in 15 1 sides, monolateral porous cloth stream dividing plate 10 is all vertically placed with porous cloth stream plate 11, and orthogonal, and the height of porous cloth stream plate 11 is lower than the height of monolateral porous cloth stream dividing plate 10; The automatic supply transfer lime 12 of oxygenant, ultraviolet lamp 13, precursor reactant groove 9 tops, parabolic type lampshade 14 side of being fixed in, ultraviolet lamp 13 is positioned at the focus place of parabolic type aluminum lampshade 14, and automatic supply transfer lime 12 height of oxygenant are a little less than parabolic type aluminum lampshade 14 belows and the side's of being attached to precursor reactant groove 9 internal surfaces; Nano-crystalline titanium dioxide fiber optic catalyticreactor water-in 15 is arranged in one side that monolateral porous cloth stream dividing plate 10 does not have hole with nano-crystalline titanium dioxide fiber optic catalyticreactor water outlet 16, be evenly distributed with the 1-3mm aperture, the effect that reaches even distribution current and prevent the nano-crystalline titanium dioxide fiber loss on monolateral porous cloth stream dividing plate 10 1 sides and the porous cloth stream plate 11; Nano-crystalline titanium dioxide fiber optic catalyticreactor water-in 15, nano-crystalline titanium dioxide fiber optic catalyticreactor water outlet 16 all are placed with the cotton filtering layer 17 of organic fibre, play the effect of filtering Inlet and outlet water; The nano-crystalline titanium dioxide fiber optic catalyticreactor water outlet 16 of each grade all is connected by the nano-crystalline titanium dioxide fiber optic catalyticreactor water-in 15 of pipe connecting 3 with next stage; The nano-crystalline titanium dioxide fiber optic catalyticreactor mirror image symmetry of adjacent two-stage; The nano-crystalline titanium dioxide fiber is the side's of being layered on precursor reactant groove 9 bottoms evenly.
The present invention is based on nano-crystalline titanium dioxide fiber optic mechanism of catalytic reaction etc. the technology of the parallel circulating water treatment of the folded formula of journey, its concrete technical process is as follows: the waste water that will contain organic pollutant (passes through filtration treatment in advance, do not contain suspended solid) inject in the tank 2, open water pump 1 and ultraviolet lamp 13, waste water then pumps through water pump 1 from tank 2 left ends, the moisture that pumps is left and right sides two-way, the left road water under meter 6 of after first valve 4 is regulated flows, flowing through wherein, after nano-crystalline titanium dioxide fiber optic catalyticreactor water-in 15 first filtrations that are equipped with the cotton filtering layer 17 of organic fiber are arranged, current under the effect of gravity, the vertical side's of inflow precursor reactant groove 9.The porous cloth stream plate 11 that distributes through several radial symmetry has reached even cloth stream and the purpose that reduces current successively.The stroke winding type that current are set along monolateral porous cloth stream dividing plate 10 moves ahead, and under ultraviolet lamp 13 and the 14 catoptrical effects of parabolic type aluminum lampshade, passes the gap location generation light-catalyzed reaction of the nano-crystalline titanium dioxide fibre three-dimensional dispersion of filling.Meanwhile, the automatic supply transfer lime 12 of the oxygenant of horizontal positioned begins to splash into oxygenant, participates in reaction.The application of monolateral porous cloth stream dividing plate 10, significantly reduced water flow velocity, define the range of movement of nano-crystalline titanium dioxide fiber simultaneously, guaranteed under the flow action of big flow, fiber is difficult for by disconnected broken, loss, the influence that brings because of the relative movement with current obviously reduces, and both fully contact.Current flow into next stage nano-crystalline titanium dioxide fiber optic catalyticreactor water-ins 15, formation circulating water treatment by after the nano-crystalline titanium dioxide fiber optic catalyticreactor water outlet 16 that is equipped with the cotton filtering layer 17 of organic fiber is arranged filtering again by pipe connecting 3.Form circulation with this, current are back to the left end of tank 2 by last step nano-crystalline titanium dioxide fiber optic catalyticreactor by pipe water outlet 8; The right wing water that water pump 1 pumps is behind second valve, 5 control flows, directly arrive tank 2 top-right spray aeration heads 7, a plurality of orifice jet ejections from spray aeration head 7, carry out aeration aerating, the waste water that is rich in dissolved oxygen sprays into tank 2 right-hand members, flow to left end again and pump through water pump 1, form another set of circulation.Behind the circulation certain hour, the organism that contains in the waste water can all be explained, and is CO until thorough mineralising
2And H
2O.
The principle of the invention is as follows:
In the technical process of the present invention, waste water is extracted out through water pump, flow in the first step photo catalysis reactor by the water inlet that is plugged with the cotton filtering layer of organic fibre, flow the purpose that plates reach even step stream, reduce flow velocity through a series of special parallel baffles and porous cloth again, effectively reduced the impact to the nano-crystalline titanium dioxide fiber, guaranteed the dynamic fixing of fiber in reactor, current are able to abundant reaction through the gap.The current of first step reactor flow into the next stage reactor through the water outlet that is plugged with the cotton filtering layer of organic fibre, form parallel circulation.Between different reactors, filter step by step.If there is not the setting of dividing plate, then fiber can impact a jiao of reactor under the effect of current, does not have good three-dimensional scatter gap to pass by current, and optical loss is serious, almost unglazed catalytic effect.For the wastewater treatment of big current, be difficult to drop into actual production application.
The present invention is according to the meeting of the liquid layer between light source and catalyzer absorb light, scattered light, and on the theoretical basis that the photoabsorption that makes catalyzer weakens, design low liquid level, large-area layout, do not have the problem of traditional cylindrical reactor illumination " blind area ", significantly improved light-catalysed effect.And the application of parabolic type lampshade has then overcome the drawback of traditional water flat fluorescent tube arranged light serious waste phenomenon, has significantly reduced optical loss.Simultaneously, the distinctive curve character of parabolic type makes reflected light vertical irradiation liquid level, and illumination is even.
The present invention has taken into full account hydrogen peroxide in the importance based on nano-crystalline titanium dioxide fiber optic mechanism of catalytic reaction, has increased in the reaction solution device of supply hydrogen peroxide automatically, and this also is one of innovative point of giving prominence to of the present invention.Drawn simultaneously among the patent CN.201010503062.6 when light-catalyzed reaction is carried out, to handling the measure that waste water sprays the oxygen that exposes to the sun.In the light-catalyzed reaction in the process, O
2With H
2O
2Participation seem of crucial importance.The oxygen that is adsorbed in catalyst surface can be captured light induced electron e
-, be e
-Effective receptor, oxygen and e
-Reduction reaction not only generate the required hydroxyl radical free radical of surface light catalytic oxidation (OH), and provide required OH for the hole
-And H
2O further produces OH, forms a surface of good photocatalytic process, reduces the right recombination rate in semiconductor light-catalyst surface electronic-hole, improves speed of reaction greatly.Hydrogen peroxide, also can capture the oxygen that is adsorbed in catalyst surface is light induced electron e
-, generate hydroxyl radical free radical (OH), similar to the mechanism of oxygen.Because the meltage of water oxygen gas is very little, even spray exposes to the sun after the oxygen, does not have yet and significantly improve.And hydrogen peroxide adds reaction solution with liquid form, with surface and the reaction solution full contact of nano-crystalline titanium dioxide fiber.Than the expose to the sun behave of oxygen of spray, the katalysis of supply hydrogen peroxide is more obvious automatically, and catalytic effect increases significantly in the real reaction.The light-catalysed reaction mechanism of nano-crystalline titanium dioxide fiber is as follows:
O
2+TiO
2(e
-)→TiO
2+?·O
2 -
·O
2 -+2H
2O+TiO
2(e
-)→TiO
2+H
2O+2OH
-
H
2O
2+TiO
2(e
-)→TiO
2+·OH+OH
-
TiO
2(h
+)+H
2O→TiO
2+H
++·OH
TiO
2(h
+)+OH
-→TiO
2+·OH
The invention will be further described below in conjunction with example.
Single-stage reactor rectangular parallelepiped length 400mm, width 250mm, height 150mm.Above liquid level, place a parabolic type aluminum lampshade, its focal length reactor head 50mm.The medium pressure mercury lamp level of 50W places on the determined axis of its focus, evenly fills 100g nano-crystalline titanium dioxide fiber.Adopt the 25W water pump, conditioned reaction device water flow is 9L/min, and liquid level is 50mm when stablizing.Adopt 5 stage reactors to pile up in the experiment, the current lift velocity is about 2cm/min, and processing 1000L concentration capable of circulation was the X-3B reactive brilliant red waste water from dyestuff of 20mg/L in one day, and current consumption only is 6.6 degree/sky.
Claims (8)
1. water treatment device based on nano-crystalline titanium dioxide fiber optic mechanism of catalytic reaction, comprise n nano-crystalline titanium dioxide fiber optic catalyticreactor, water pump [1], tank [2], pipe connecting [3], first valve [4], second valve [5], under meter [6], spray aeration head [7] and rising pipe [8], n is more than or equal to 1; Wherein, tank [2] water outlet links to each other with water pump [1] water-in, water pump [1] water outlet is divided into two-way, wherein left road is connected with first valve [4], right wing links to each other with second valve [5], first valve [4] links to each other with under meter [6] water-in, under meter [6] water outlet links to each other with nano-crystalline titanium dioxide fiber optic catalyticreactor water-in [15], nano-crystalline titanium dioxide fiber optic catalyticreactor water outlet [16] links to each other with next stage nano-crystalline titanium dioxide fiber optic catalyticreactor water-in [15] by pipe connecting [3], form circulation with this, linked to each other with tank [2] by rising pipe [8] by last step nano-crystalline titanium dioxide fiber optic catalyticreactor water outlet [16], second valve [5] links to each other with spray aeration head [7], and spray aeration head [7] is positioned at tank [2] top; It is characterized in that: the nano-crystalline titanium dioxide fiber optic catalyticreactor side's of comprising precursor reactant groove [9], monolateral porous cloth stream dividing plate [10], porous cloth stream plate [11], the automatic supply transfer lime of oxygenant [12], ultraviolet lamp [13], parabolic type aluminum lampshade [14], nano-crystalline titanium dioxide fiber optic catalyticreactor water-in [15] and nano-crystalline titanium dioxide fiber optic catalyticreactor water outlet [16]; The inner top of parabolic type aluminum lampshade [14] side's of being positioned at precursor reactant groove [9] wherein, ultraviolet lamp [13] is placed horizontally at the axial focus place of parabolic type aluminum lampshade [14]; The automatic supply transfer lime of oxygenant [12] is placed horizontally at the below at parabolic type aluminum lampshade [14] edge; Monolateral porous cloth stream dividing plate [10] equidistantly vertically in the side's of embedding precursor reactant groove [9], is parallel to each other, and the porous cloth of adjacent separator stream part position opposite; Porous cloth stream plate [11] is positioned between the monolateral porous cloth stream dividing plate [10] of nano-crystalline titanium dioxide fiber optic catalyticreactor water-in [15] side and square precursor reactant groove [9] cell wall, and is vertical with monolateral porous cloth stream dividing plate [10]; Evenly fill the nano-crystalline titanium dioxide fiber between the adjacent monolateral porous cloth stream dividing plate [10]; Nano-crystalline titanium dioxide fiber optic catalyticreactor water-in [15] is arranged in one side that monolateral porous cloth stream dividing plate [10] does not have hole with nano-crystalline titanium dioxide fiber optic catalyticreactor water outlet [16].
2. a kind of water treatment device based on nano-crystalline titanium dioxide fiber optic mechanism of catalytic reaction according to claim 1 is characterized in that: nano-crystalline titanium dioxide fiber optic catalyticreactor water-in [15] has all been laid the cotton filtering layer [17] of one deck organic fibre with nano-crystalline titanium dioxide fiber optic catalyticreactor water outlet [16].
3. a kind of water treatment device based on nano-crystalline titanium dioxide fiber optic mechanism of catalytic reaction according to claim 1 is characterized in that: the laying between the monolateral porous cloth stream dividing plate [10] is spaced apart 8-10cm.
4. a kind of water treatment device based on nano-crystalline titanium dioxide fiber optic mechanism of catalytic reaction according to claim 1 is characterized in that: the laying between the porous cloth stream plate [11] is spaced apart 6-8cm.
5. a kind of water treatment device based on nano-crystalline titanium dioxide fiber optic mechanism of catalytic reaction according to claim 1, it is characterized in that: the automatic supply transfer lime of oxygenant [12] is arranged in the both sides of the edge of parabolic type aluminum lampshade [14].
6. a kind of water treatment device based on nano-crystalline titanium dioxide fiber optic mechanism of catalytic reaction according to claim 1, it is characterized in that: monolateral porous cloth stream dividing plate [10] is rectangle, the width of length and square precursor reactant groove [9] adapts, height 8-10cm arranges hole at a lateral edges 1/5 place of monolateral porous cloth stream dividing plate [10].
7. a kind of water treatment device based on nano-crystalline titanium dioxide fiber optic mechanism of catalytic reaction according to claim 1 is characterized in that: porous cloth stream plate [11] is highly consistent with monolateral porous cloth stream dividing plate [10], a series of holes of even laying on it.
8. a kind of water treatment device based on nano-crystalline titanium dioxide fiber optic mechanism of catalytic reaction according to claim 1, it is characterized in that: the square precursor reactant groove [9] of nano-crystalline titanium dioxide fiber optic catalyticreactor is rectangular parallelepiped.
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| CN105439241A (en) * | 2016-01-06 | 2016-03-30 | 江苏大学 | Waste water treatment device based on thin-layer water film ultraviolet-light-catalyzed waste water |
| CN108283913A (en) * | 2017-01-09 | 2018-07-17 | 徐海澜 | The hollow light guide fiber photo catalysis reactor strengthened by three-dimensional electric field and graphene |
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| 二氧化钛纳米晶的制备及光催化活性研究;陈琦丽等;《材料科学与工程学报》;200308;第21卷(第4期);518-520 * |
| 陈琦丽等.二氧化钛纳米晶的制备及光催化活性研究.《材料科学与工程学报》.2003,第21卷(第4期), |
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