CN102295318A - Nanometer rotating disc photocatalytic water treatment device - Google Patents

Nanometer rotating disc photocatalytic water treatment device Download PDF

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Publication number
CN102295318A
CN102295318A CN2011102368921A CN201110236892A CN102295318A CN 102295318 A CN102295318 A CN 102295318A CN 2011102368921 A CN2011102368921 A CN 2011102368921A CN 201110236892 A CN201110236892 A CN 201110236892A CN 102295318 A CN102295318 A CN 102295318A
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rotating disk
nanometer
tank
treatment device
water treatment
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CN102295318B (en
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周继军
张雁秋
刘碧波
武秀琴
陈纳
马梦娟
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Henan Institute of Engineering
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Henan Institute of Engineering
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/30Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37Wastewater or sewage treatment systems using renewable energies using solar energy

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Abstract

The invention relates to a nanometer rotating disc photocatalytic water treatment device which has a large area of mass transfer in gas and liquid phase, a large lighting area, high luminous absorption efficiency, repeatedly usable nano-materials and high photocatalysis efficiency. The invention enables effective solving of problems of high cost and poor effects of treatment of waste water, impossible recovery of powdery nano-materials and poor photocatalysis efficiency of nanometer films existing in the prior art. A technical scheme in the invention for the solving of the problems is as follows: the device comprises a water tank and rotating discs; a plurality of the rotating discs are uniformly arranged on a rotating shaft in the water tank which is coated by a layer of nano-materials; ultraviolet lamps or visible lighting tubes are installed between every two adjacent rotating discs; baffle plates are arranged around the rotating discs and at the upper part of the water tank; one end of the water tank is provided with a waste water inlet while the other end is provided with a sludge outlet; the upper part of baffle plates is provided with an overflow weir; the thickness of the layer of nano-materials is normally in a range of 10 nm to 1 mu m. The invention has the advantages of a unique structure, convenient usage and good treating effects of waste water, and shows innovation to treating devices for waste water.

Description

Nanometer rotating disk photocatalytic water treatment device
Technical field
The present invention relates to water treatment device, especially be applicable to a kind of nanometer rotating disk photocatalytic water treatment device of the wastewater treatment that biochemical is relatively poor.
Background technology
Nano material has good light induced electron-hole to characteristic, and the hole has stronger oxidation capacity, can will be adsorbed in the oxidation operation of nano-material surface, also can be with the OH of surface adsorption -Oxidation generates OH, simultaneously, and O 2Also can capture the e of nano-material surface -Generate O 2 -,O 2 。-With H 2O and OH -The chemical reaction of a series of complexity takes place, also can generate OH, and the OH extremely strong free radical that is oxidation capacity, almost can be with all oxidation operations in the water, produce carbonic acid gas, water and inorganic salt, in addition, a lot of nanometers also have inexpensive, stable and eco-friendly characteristics, will play an important role in water treatment field.
The biodegradability of a lot of trade effluents is relatively poor, as dyeing waste water, antibiotic waste water, agricultural chemicals waste water etc., and at this type of wastewater treatment, many both at home and abroad at present based on biochemical process, be aided with chemical method, but ubiquity is handled shortcomings such as investment cost is big, running cost is high, treatment effect is not good, is badly in need of new technology and method it is handled.
The nano-photo catalytic water technology has a good application prospect, and its advantage is: (1) degradation speed is fast, generally only needs dozens of minutes can obtain good water treatment effect to several hrs; (2) degraded non-selectivity, any organism of almost degrading is particularly suitable for chlorinatedorganic, polycyclic aromatic hydrocarbons etc.; (3) oxidation reaction condition gentleness, less investment, energy consumption is low, with under UV-irradiation or the sunlight photocatalysis oxidation reaction taking place; (4) non-secondary pollution, organism thoroughly are degraded to CO 2And H 2O; (5) applied range, nearly all sewage and waste water can adopt.
At present, nano powder photocatalyst agent preparation technology is comparatively ripe, and the photocatalytic degradation effect is also relatively good.
Yet Powdered nano-photocatalyst in use exists dispersion and recovery difficulty, can't reuse and, absorptivity not high a series of problems strong to scattering of light, even has the potentially dangerous of nano-powder pollution.This also is the major cause that is difficult to large-scale application and commercialization popularization based on the photocatalysis technology of nano powder photocatalyst agent.
Since the nineties in 20th century, states such as the U.S., Japan have carried out the research of nanometer powder immobilization or nano thin-film preparation.Up to the present, test the feasibility of multiple film preparing technology, and in various organic photocatalytic degradation researchs, obtained certain effect.Nano-film photocatalyst is compared with nanometer powder to have and is not had the advantage of separating, can reuse, but photocatalysis efficiency is compared the reduction that all has in various degree with nanometer powder, this is because the fixing back of catalyzer specific surface area reduces, cause its adsorption and utilization ratio to reduce, thereby reduced the activity of nano-photocatalyst.
Summary of the invention
At above-mentioned situation, for overcoming the defective of prior art, the present invention's purpose just provides a kind of nanometer rotating disk photocatalytic water treatment device that gas-liquid phase mass transfer area is big, illuminating area is big, efficiency of light absorption is high, nano material is reusable and photocatalysis efficiency is high, can effectively solve the problem of the high and weak effect of existing wastewater treatment expense and the powder nanometer material can't reclaim and the problem of nano thin-film photocatalysis efficiency difference.
The technical scheme of its solution is, comprise tank and rotating disk, all be equipped with a plurality of rotating disks on the rotation axis in the tank, be coated with layer of nanomaterial on the rotating disk, ultraviolet lamp or visible fluorescent tube are housed between two adjacent rotating disks, in the tank upper end baffle plate is housed around the rotating disk, tank one end has the waste water import, the other end has sludge outlet, and there is overflow weir the baffle plate upper end, and said nano material layer thickness is generally between the 10nm-1 μ m.
Structure uniqueness of the present invention, easy to use, good waste water treatment effect is the innovation on the wastewater treatment equipment.
Description of drawings
Fig. 1 is a three-dimensional structure diagram of the present invention.
Fig. 2 takes away the three-dimensional structure diagram of ceiling for the present invention.
Fig. 3 takes away the left view of ceiling and baffle plate for the present invention.
Fig. 4 takes away the front view of ceiling and baffle plate for the present invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Provide by Fig. 1 to Fig. 4, the present invention includes tank and rotating disk, all be equipped with a plurality of rotating disks 3 on the rotation axis 2 in the tank 1, be coated with layer of nanomaterial on the rotating disk 3, ultraviolet lamp be housed between two adjacent rotating disks 3 or visible fluorescent tube 4(determines according to the nano material band-gap energy), in tank 1 upper end baffle plate 5 is housed around the rotating disk 3, tank 1 one ends have waste water import 6, the other end has sludge outlet 7, and there is overflow weir 12 baffle plate 5 upper ends, and said nano material layer thickness is generally between the 10nm-1 μ m.
In order to guarantee result of use, the thickness of said rotating disk 3 is generally the 2-6 millimeter, and diameter is 30-300 centimetre (determining according to wastewater flow), and two adjacent rotating disk spacings are about 20-30 centimetre, the lower edge of rotating disk 3 is 0.5-3 centimetre apart from tank 1 distance from bottom, and rotating disk 3 rotating speeds are that 2-3 changes /Minute, its material is for having certain intensity and toughness, and corrosion-resistant material makes, and when rotating disk 3 diameters are big, adorns a plurality of ultraviolet lamps or visible fluorescent tube between two adjacent rotating disks.
Said baffle plate 5 is skewed, there is vertical packaged type ceiling 8 its upper end, when the wind and rain sky, can avoid rotating disk 3 and fluorescent tube 4 by dust storm and rainwater piping and druming, at fine day, when wind speed is moderate, but Xiang Yiduan removes ceiling 8, make full use of sunlight, when removing ceiling 8, the baffle plate 5 of inclination can increase the area of solar radiation rotating disk 3.
Said ultraviolet lamp or visible fluorescent tube 4 are the long fluorescent tube of circular arc, are fixed between the rotating disk 3 through the support on the baffle plate 59, and the supply lead of ultraviolet lamp or visible fluorescent tube 4 places in the supply lead fixed tube 10 in baffle plate 5 outsides, and links to each other with power supply.
Said tank 1 is semicircle hollow body, and sludge outlet 7 places semicircular base, links to each other with tank 1 through sludge bucket 11, is convenient to the sedimentary discharge in the waste water.
Layer of nanomaterial of the present invention prepares nanoparticle by methods such as sol-gel method, sol method, hydrothermal methods, mode by rotation or dip-coating, Nano sol or gel are coated in disc surfaces equably, heating at high temperature again, can obtain nanocrystal, and crystal combines closely with disc surfaces.Some nanoparticle that utilizes aforesaid method to obtain utilizes methods such as hydrothermal method again, can the production nanometer rod, nano wire (as ZnO), add specific ionogen, can also produce nanotube.
In addition, can also be by utilizing direct oxidation method or anonizing (as TiO 2), can then metallic film be covered disc surfaces becoming nano material on the metallic film surface; Also can utilize galvanic deposit/alumina formwork method, can generate nanometer rod, nanotube, nano wire, the nano belt of various semiconductor materials on the metallic film surface, can improve the specific surface area of nanometer greatly, thereby improve its catalytic performance, the metallic film film covers disc surfaces then, makes the nano material rotating disk.
The layer of nanomaterial of indication of the present invention comprises that all can be used for light-catalysed semiconductor nano material, as metal oxide TiO 2, ZnO, SnO 4, ZrO 2, Cu 2O, Ce 2O, W 2O 3Deng, metallic sulfide CdS, PbS, Ag 2S, Sb 2S 3, ZnS, Bi 2S 3Deng, also comprise the complex metal oxides conductor material, as BiVO 4Deng.
Above-mentioned nano material, as band-gap energy big (greater than 3.0eV), by methods such as doping metals or non-metallic element, narrow gap semiconductor sensitization, noble metal nano particles sensitization, the sensitizations of organo-metallic pigment, its band gap is narrowed down, absorption spectrum (can not only utilize UV-light to the visible light expansion, also can utilize sunlight), and can prolong the right retention time in light induced electron-hole, thus improve its catalytic performance greatly.
Service condition of the present invention is, waste water is after waste water import 6 enters tank 1, under the rotation of rotating disk 3, it is attached to form the thin moisture film of one deck on the nanometer layer on the rotating disk 3, because rotating disk quantity (at a distance of about 20-30cm) is more, improved illuminating area greatly, accelerate light-catalyzed reaction speed, so simultaneously, the directly water transmission in tank of airborne oxygen, and moisture film transmission that can also be on rotating disk, improve the gas-liquid phase mass transfer area of oxygen greatly, because moisture film is thinner, significantly reduced the resistance of liquid mass transfer of oxygen simultaneously, thereby improved the speed that oxygen transmits greatly in water, also reduce reflection and the sorption of water greatly, improve efficiency of light absorption, thereby greatly improve light-catalyzed reaction speed light, waste water after the processing is drained through overflow weir 12, and mud is discharged through sludge outlet 7.
Structure uniqueness of the present invention, easy to use, good waste water treatment effect, cost is low, is the innovation on the relatively poor sewage treatment equipment of biochemical.

Claims (6)

1. nanometer rotating disk photocatalytic water treatment device, comprise tank and rotating disk, it is characterized in that, all be equipped with a plurality of rotating disks (3) on the rotation axis (2) in the tank (1), rotating disk is coated with layer of nanomaterial on (3), ultraviolet lamp or visible fluorescent tube (4) are housed between adjacent two rotating disks (3), in tank (1) upper end baffle plate (5) is housed around the rotating disk (3), tank (1) one end has waste water import (6), the other end has sludge outlet (7), there is overflow weir (12) baffle plate (5) upper end, and said nano material layer thickness is generally between the 10nm-1 μ m.
2. nanometer rotating disk photocatalytic water treatment device according to claim 1, it is characterized in that, the thickness of said rotating disk (3) is generally the 2-6 millimeter, diameter is 30-300 centimetre, two adjacent rotating disk spacings are about 20-30 centimetre, the lower edge of rotating disk (3) is 0.5-3 centimetre apart from tank (1) distance from bottom, and rotating disk (3) rotating speed is that 2-3 changes /Minute, when rotating disk (3) when diameter is big, adorn a plurality of ultraviolet lamps or visible fluorescent tube between two adjacent rotating disks.
3. nanometer rotating disk photocatalytic water treatment device according to claim 1 is characterized in that said baffle plate (5) is skewed, and there is vertical packaged type ceiling (8) its upper end.
4. nanometer rotating disk photocatalytic water treatment device according to claim 1, it is characterized in that, said ultraviolet lamp or visible fluorescent tube (4) are the long fluorescent tube of circular arc, be fixed between the rotating disk (3) through the support (9) on the baffle plate (5), the supply lead of ultraviolet lamp or visible fluorescent tube (4) places in the supply lead fixed tube (10) in baffle plate (5) outside, and links to each other with power supply.
5. nanometer rotating disk photocatalytic water treatment device according to claim 1 is characterized in that said tank (1) is semicircle hollow body, and sludge outlet (7) places semicircular base, links to each other with tank (1) through sludge bucket (11).
6. nanometer rotating disk photocatalytic water treatment device according to claim 1 is characterized in that said layer of nanomaterial is by TiO 2, ZnO, SnO 4, ZrO 2, Cu 2O, Ce 2O, W 2O 3Or CdS, PbS, Ag 2S, Sb 2S 3, ZnS, Bi 2S 3Or BiVO 4A kind of making.
CN201110236892A 2011-08-18 2011-08-18 Nanometer rotating disc photocatalytic water treatment device Expired - Fee Related CN102295318B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104014291A (en) * 2014-06-16 2014-09-03 上海师范大学 Fluorescent rotary plate reactor utilizing Ag/BiOBr visible light catalytic film
CN105347431A (en) * 2015-11-30 2016-02-24 无锡工源机械有限公司 Photocatalytic water storage pool used for sewage treatment
CN106587249A (en) * 2016-11-15 2017-04-26 西安交通大学 Interdigital organic pollutant photodegradation device and preparation method thereof
WO2021218630A1 (en) * 2020-04-26 2021-11-04 Xing Yifan Heterogeneous catalytic reactor

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CN101254961A (en) * 2008-04-10 2008-09-03 上海交通大学 Method for treating refractory organic wastewater by TiO2 film electrode photoelectric turnplate
CN101327968A (en) * 2008-07-08 2008-12-24 广东工业大学 Photoelectric catalysis degrading organic reactor with swivel disc loaded with catalyst and degrading method
CN201458884U (en) * 2009-06-23 2010-05-12 武汉大学 Device for making brine by separating salt solution from glyphosate wastewater
CN101774661A (en) * 2010-01-28 2010-07-14 上海交通大学 Composite rotating disk liquid film reactor and method for processing organic wastewater

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Publication number Priority date Publication date Assignee Title
CN101254961A (en) * 2008-04-10 2008-09-03 上海交通大学 Method for treating refractory organic wastewater by TiO2 film electrode photoelectric turnplate
CN101327968A (en) * 2008-07-08 2008-12-24 广东工业大学 Photoelectric catalysis degrading organic reactor with swivel disc loaded with catalyst and degrading method
CN201458884U (en) * 2009-06-23 2010-05-12 武汉大学 Device for making brine by separating salt solution from glyphosate wastewater
CN101774661A (en) * 2010-01-28 2010-07-14 上海交通大学 Composite rotating disk liquid film reactor and method for processing organic wastewater

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104014291A (en) * 2014-06-16 2014-09-03 上海师范大学 Fluorescent rotary plate reactor utilizing Ag/BiOBr visible light catalytic film
CN105347431A (en) * 2015-11-30 2016-02-24 无锡工源机械有限公司 Photocatalytic water storage pool used for sewage treatment
CN105347431B (en) * 2015-11-30 2018-04-24 无锡工源机械有限公司 A kind of photocatalysis tank for sewage disposal
CN106587249A (en) * 2016-11-15 2017-04-26 西安交通大学 Interdigital organic pollutant photodegradation device and preparation method thereof
CN106587249B (en) * 2016-11-15 2019-06-11 西安交通大学 A kind of interdigitated organic pollutant light degradation device and preparation method thereof
WO2021218630A1 (en) * 2020-04-26 2021-11-04 Xing Yifan Heterogeneous catalytic reactor

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