A kind of waste disposal plant that utilizes photocatalysis oxidation reaction
Technical field
The utility model relates to a kind of waste disposal plant, particularly relates to a kind of waste disposal plant that utilizes photocatalysis oxidation reaction.
Background technology
Japanese scientist A.Fujishima in 1972 and K.Honda find the TiO of illumination
2Monocrystalline electrode energy water of decomposition causes the interest of scientific worker to the photosensitized oxidation reduction reaction, has promoted the interest of organism and inorganics photoredox reaction thus.
Photocatalytic oxidation is the method that ultraviolet radiation (UV) and oxygenant are used in combination.Under the exciting of UV-light, the oxygenant photolysis produces stronger free radical (as OH) and the active oxygen of oxidation capacity.Hydroxyl radical free radical has high oxidizing electrode current potential (2.80v), is only second to F (3.06v).Its electron affinity power is 596.3KJ, easily the high cloud density point of attack.This has determined the OH attack to have rapidity, and by transfer transport and addition reaction, can not have reacting with pollutants in sewage of selection.Be carbonic acid gas, water by breaking the chain scission of link, oxidizing the contaminants into, the direct mineralising of part material becomes salt, and can not produce secondary pollution.This just makes it have very strong photoxidation restoring function, various organic compound of oxidable decomposition and part inorganics, can destroy the cytolemma of bacterium and solidify the protein of virus, thus can the many single Persistent organic pollutants that can't decompose with oxygenant of oxidation.The common use of UV-light and oxygenant makes photochemical catalytic oxidation no matter on oxidation capacity still is speed of reaction, considerably beyond utilizing photoinduction to produce hydroxyl radical free radical OH, is that engineering of water treatment is paid close attention to more a kind of novel advanced oxidation device in recent years all.
Because photocatalytic oxidation has the cheap characteristic such as nontoxic of good chemical stability, mechanical stability, fast light burn into and is widely used in anti-pollution paint, sterilization, sun power sensitization battery and photocatalysis treatment environmental pollutant etc.But, because TiO
2Particle suspension is in liquid phase, and difficult separation and recycling has limited it in Application of Sewage, causes the research in a lot of sewage of photocatalyst catalyzed oxidation field still to rest in the laboratory scope, does not have the real society that moves towards.Be badly in need of a kind of waste disposal plant that can utilize photocatalysis oxidation reaction.
Summary of the invention
The purpose of this utility model provides a kind of waste disposal plant that utilizes photocatalysis oxidation reaction, and it can satisfy the demand of prior art.
A kind of waste disposal plant that utilizes photocatalysis oxidation reaction, it is characterized in that having an aqua storage tank, the import of gas-liquid mixing pump is communicated with the ozone output tube of the side of aqua storage tank and ozonizer, the gas-liquid mixed pump outlet is communicated with the water inlet pipe that photo catalysis reactor is brought water valve into, water intaking valve is positioned at the side lower part of photo catalysis reactor, the bottom of photo catalysis reactor is provided with the blow-off pipe of wash water valve, the both sides, top of photo catalysis reactor are respectively arranged with the pipeline of reverse flow valve and outlet valve, there is the pipeline of reverse flow valve to be communicated with the top of aqua storage tank, there is the special-purpose ultraviolet lamp of a sewage disposal at photo catalysis reactor inside center place, and spacing is the TiO 2 coating film dish group that 8-10cm is arranged in parallel, described TiO 2 coating film dish is a disc, central hole, ultraviolet lamp is passed by this hole, is furnished with aperture on the card.
The utility model has the advantages that: 1, high molten gas mixing ratio, 2, counter answer between Ting Liu Time long, 3, reaction contact area is big, 4, reaction rate of oxidation height.
Description of drawings
Accompanying drawing is a structural representation of the present utility model.
Embodiment
The utility model has an aqua storage tank 1, gas-liquid mixing pump 2, an ozonizer 3 and a photo catalysis reactor 4.The import of gas-liquid mixing pump 2 is communicated with the side of aqua storage tank 1 and the ozone output tube of ozonizer 3, and the outlet of gas-liquid mixing pump 2 is communicated with the water inlet pipe that photo catalysis reactor 4 is brought water valve 5 into.Water intaking valve 5 is positioned at the side lower part of photo catalysis reactor 4.The bottom of photo catalysis reactor 4 is provided with wash water valve 6, in order to the usefulness of blowdown.The top of photo catalysis reactor 4 is provided with reverse flow valve 8 and outlet valve 7 respectively, and wherein reverse flow valve 8 is communicated with by the top of pipeline with aqua storage tank 1, and recirculation water can be got back in the middle of the aqua storage tank 1.Reactor 4 inside center have the special-purpose ultraviolet lamp 10 of sewage disposal outward, and the TiO 2 coating film dish group 9 that is arranged in parallel of spacing 8-10cm.The TiO 2 coating film dish is a disc-shape, and central hole is furnished with aperture and flows through for air-water mixture so that ultraviolet lamp 10 passes on the card, be coated with the titanium dioxide optical catalyst film on the card.
When using the utility model, sewage at first enters aqua storage tank 1 and stores, and after the recirculation water with photo catalysis reactor 4 mixes, is delivered to photo catalysis reactor 4 bottoms by gas-liquid mixing pump 2 through water intaking valve 5.Simultaneously, the ozone that is produced by ozonizer 3 dissolves in the water with 1: 9 volume ratio of vapour-liquid ratio, and enters photo catalysis reactor 4 inside together along with the running of gas-liquid mixing pump 2.In photo catalysis reactor 4, provide ultraviolet energy by intermediary ultraviolet lamp 10, shine on the nano titanium oxide plated film dish 9 that is arranged in the reactor, under its katalysis, ozone soluble in water, oxygen and water generates hydroxyl radical free radical, organism in the water is decomposed, germicidal action is provided simultaneously.Water successively by each plated film dish, forms plug-flow from the perforation of the TiO 2 coating film dish 9 of arrangement, make after the continuous reduction of COD concentration, enters the upper space of photoreactor 4.Clear water (comprising the air that discharges in the water) after a part is handled is discharged through outlet valve 7, and another part is back to aqua storage tank 1 through reverse flow valve 8, makes the usefulness of former water of dilution and molten gas.Time opening wash water valve 6 is to get rid of the throw out that accumulates for a long time in the photoreactor 4.
The utility model has following characteristics:
1. high molten gas mixing ratio: use special air dissolved pump to carry out molten gas, import at pump forms the negative inspiratory pressure suction, in pump under the running up of impeller with tinyization of waste water bubble, and maintenance high-pressure gas-liquid mixed state, make hydroxyl free radical (OH) fully and pollutant reaction and suspension is dispersed in the reactor, reach the highest mixed reaction.
2. use ozone to replace airborne oxygen as oxidant, can produce than the more hydroxyl radical free radical of oxygenating air, promote reaction to carry out fast.
3. long between the anti-Ting of answering Liu Time: the diversion reaction apparatus that inside reactor is provided with a certain angle makes between Shui power Ting Liu Time enough.
4. reaction contact area is big: all contact surfaces of inside reactor all have TiO 2 coating film, can make the maximization of energy exposure and contact reacts area.
5. reaction rate of oxidation height: evenly the waste water of microbubble shape down with hydroxyl free radical can be rapidly effectively and pollutant reaction, the raising reaction efficiency reaches the optimum extent degradation effect.
6. product modularized design: can adapt to the various water yields.