CN111072126A - Integrated photocatalytic oxidation-membrane separation circulating fluidized bed reaction device - Google Patents
Integrated photocatalytic oxidation-membrane separation circulating fluidized bed reaction device Download PDFInfo
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- CN111072126A CN111072126A CN201811218987.9A CN201811218987A CN111072126A CN 111072126 A CN111072126 A CN 111072126A CN 201811218987 A CN201811218987 A CN 201811218987A CN 111072126 A CN111072126 A CN 111072126A
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- shell
- membrane
- fluidized bed
- circulating fluidized
- photocatalytic oxidation
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- 239000012528 membrane Substances 0.000 title claims abstract description 69
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 40
- 230000001699 photocatalysis Effects 0.000 title claims abstract description 37
- 238000000926 separation method Methods 0.000 title claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000005273 aeration Methods 0.000 claims abstract description 18
- 239000010802 sludge Substances 0.000 claims abstract description 9
- 230000035515 penetration Effects 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000010453 quartz Substances 0.000 claims description 4
- 239000003054 catalyst Substances 0.000 abstract description 19
- 238000012546 transfer Methods 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000004064 recycling Methods 0.000 abstract description 2
- 239000003344 environmental pollutant Substances 0.000 description 10
- 238000007254 oxidation reaction Methods 0.000 description 10
- 231100000719 pollutant Toxicity 0.000 description 10
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 9
- 238000013032 photocatalytic reaction Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 6
- 239000002351 wastewater Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000011941 photocatalyst Substances 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000007146 photocatalysis Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000004408 titanium dioxide Substances 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000009295 crossflow filtration Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/32—Details relating to UV-irradiation devices
- C02F2201/322—Lamp arrangement
- C02F2201/3227—Units with two or more lamps
Abstract
The invention discloses an integrated photocatalytic oxidation-membrane separation circulating fluidized bed reaction device, which comprises a shell, an ultraviolet light source, a membrane component, a cylindrical sleeve and an aeration device, and is characterized in that: the bottom of the shell is provided with a water inlet, the aeration device, the cylindrical sleeve, the ultraviolet light source and the membrane assembly are respectively arranged inside the shell, a water outlet of the membrane assembly is connected with a water outlet of the shell, the cylindrical sleeve is connected with the upper end of the shell, the bottom of the shell is provided with a sludge discharge port, and the distance between the ultraviolet light source and the membrane assembly is greater than the penetration distance of ultraviolet light. The integrated photocatalytic oxidation-membrane separation circulating fluidized bed reaction device has the advantages of good mass transfer performance, capability of repeatedly recycling the catalyst, simple structure and energy consumption saving.
Description
Technical Field
The device relates to a photocatalysis-membrane separation circulating fluidized bed reactor for treating toxic and harmful degraded organic wastewater.
Background
With the rapid development of socioeconomic of China, a large amount of waste pollutants are inevitably generated, which causes serious environmental pollution and ecological damage. The traditional treatment method can not thoroughly eliminate the degradation pollutants, is easy to cause secondary pollution, and has narrow application range and high energy consumption. In recent years, the degradation of pollutants by photocatalytic oxidation has received much attention.
The photocatalytic oxidation technology has the advantages of strong oxidation capacity, small secondary pollution, simple operation and the like, and becomes an effective method for treating the difficultly degraded wastewater, particularly TiO2The research and application of the photocatalysis technology are more; TiO 22One of the main problems faced by photocatalytic technology is to develop a novel integrated photocatalytic reactor based on the research of mechanism and actual catalytic oxidation kinetics of wastewater and to optimize the design of the developed reactor. Therefore, the development of a high-efficiency multifunctional integrated practical photocatalytic reactor will promote the development of TiO2The application of the photocatalysis technology in the field of wastewater treatment, in particular to the treatment of organic wastewater difficult to degrade and the removal of three substances in drinking water.
The types of the existing integrated photocatalytic reaction devices are divided into 3 types according to the existing state of a catalyst, and the reaction devices have respective advantages and disadvantages.
1) Suspension type photocatalytic reaction device: such a reaction apparatus usually adds photocatalyst powder to a solution to be treated, and has advantages that contaminants easily come into contact with the photocatalyst during the reaction, there is no limitation in mass transfer, but there is also a disadvantage that the treatment efficiency is not high; when the concentration of the catalyst is increased, suspension is turbid, light penetration is affected, and the light efficiency is reduced; and the separation, recovery and reuse of the catalyst are difficult to realize, and the wastewater treatment cost is expensive.
2) Coating catalyst reaction unit: the catalyst of the reaction device mainly exists in the form of a film, for example, the titanium dioxide photocatalyst is coated on the inner wall, the outer wall, the lamp tube wall, the optical fiber material and the like of the reaction device, and the catalyst film degrades and mineralizes pollutants adsorbed on the surface of the film under the irradiation of ultraviolet light. Its main features are no need of separating catalyst, limited mass transfer and small treating capacity of reactor.
3) Packed bed type photocatalytic reaction apparatus: the reaction device is usually a reaction device filled with titanium dioxide particles or silica gel, alumina, quartz sand, glass beads and the like coated with a titanium dioxide film on the surface, can effectively allow light to pass through, has a high specific surface area, can not be limited by mass transfer in reaction, but has the defects that the collision among particles can cause the falling of the film, the light utilization rate is low, and the replacement of the catalyst is very difficult.
Because the suspended photocatalytic reaction device has the problems of difficult separation and recovery of the catalyst and unsuitability for large-scale and commercial popularization and application in the application process, a suspended photocatalytic-membrane separation coupling technology is gradually developed, the defects of the suspended photocatalytic reaction device are overcome by utilizing the coupling of photocatalytic oxidation and a membrane technology, but the suspended photocatalytic membrane separation reaction device is divided into an integral type and a split type according to different membrane materials. The surface of the organic membrane is irradiated by an ultraviolet lamp for a long time and the membrane material is decomposed under the action of the photocatalyst, so that the organic membrane separation and photocatalytic coupling process is separated, and an inorganic membrane is generally adopted in the integrated coupling process.
Patent CN 101875001 a discloses a photocatalytic oxidation-membrane separation circulating fluidized bed reactor, in which the photocatalytic reaction zone and the membrane separation zone are separated. The catalyst has good mass transfer performance, and can realize separation and recycling of the catalyst; however, the reaction device has the disadvantages of complex structure, high energy consumption and the like, so that the application of the reaction device is limited to a certain extent.
Disclosure of Invention
In order to simplify the structure of the reaction device in CN 101875001A and save energy consumption, the invention provides an integrated photocatalytic oxidation-membrane separation fluidized bed reaction device. The device has the characteristics of good mass transfer, energy conservation, consumption reduction, small pollution, recyclable catalyst, simple structure, uniform illumination and the like.
Therefore, the technical scheme of the invention is as follows:
the utility model provides an integral type photocatalytic oxidation-membrane separation circulating fluidized bed reaction unit, includes casing, ultraviolet source, membrane module, cylindrical sleeve pipe and aeration equipment, its characterized in that: the bottom of the shell is provided with a water inlet, the aeration device, the cylindrical sleeve, the ultraviolet light source and the membrane assembly are respectively arranged in the shell, the water outlet of the membrane assembly is connected with the water outlet of the shell, the cylindrical sleeve is connected with the upper end of the shell, and the bottom of the shell is provided with a sludge discharge port; the distance between the ultraviolet light source and the membrane assembly is larger than the penetration distance of ultraviolet light. The membrane module is an immersed membrane module.
The aeration device is arranged at the bottom of the shell.
Preferably, the aeration device is horizontally arranged at the bottom of the shell, and the aeration device can also be annularly arranged at the bottom of the shell.
Preferably, the ultraviolet light source comprises an ultraviolet lamp and a quartz sleeve or a quartz cold trap sleeve arranged on the outer cover of the ultraviolet lamp.
Preferably, the housing is cylindrical in shape.
Preferably, the bottom of the shell is also provided with a sludge discharge port for discharging residual gas and sludge residues in the reaction device.
Preferably, a cylindrical sleeve which is concentric with the shell is arranged in the shell.
Preferably, a liquid level meter is arranged in the shell.
When the integrated photocatalytic oxidation-membrane separation circulating fluidized bed reaction device provided by the invention is used for treating wastewater, the following effects are achieved:
1) under the action of aeration airflow, the catalyst, waste water and air bubbles can be fully mixed and contacted in the reaction device, the photocatalytic oxidation reaction is carried out under the excitation of photons, and pollutants are effectively decomposed, so that the mass transfer efficiency and the light energy utilization rate are higher, and the photocatalytic oxidation reaction efficiency is higher.
2) No isolation plate is arranged between the ultraviolet light source and the membrane component, so that the device has the advantages of simple structure, easiness in operation and maintenance and the like; meanwhile, the distance between the two is larger than the penetration distance of light, so that the film is prevented from being decomposed by an ultraviolet light source.
3) The membrane component can be provided with a membrane bottom aeration device according to needs, when the membrane bottom aeration device is arranged, the gas-liquid-solid three-phase flow forms a cross flow filtration state of the membrane surface, and the rising bubbles generate longitudinal shearing force when passing through the membrane surface, so that membrane filaments are shaken, and the adhesion of a catalyst on the membrane surface can be effectively avoided, and the membrane pollution is reduced.
4) The membrane component in the membrane separation zone at the upper part of the reaction device can intercept the catalyst entering the upper part in the reaction device and enter the photocatalytic oxidation reaction zone again, so that the cyclic utilization of the photocatalyst is realized; when the undegraded pollutant is also intercepted, the concentration of the pollutant in the photocatalytic oxidation reaction area can be concentrated, and the reaction speed is improved.
5) Three low-voltage ultraviolet lamps are arranged in a certain range of the circle centers of the concentric circles of the shell and the sleeve at equal intervals. In the area between the shell and the sleeve, the included angle between the three low-pressure ultraviolet lamps is 120 degrees, so that the light energy can be effectively utilized, and the energy consumption is reduced.
6) The arrangement of the liquid level meter can realize continuous and intermittent operation in the reaction process, and when the intermittent reaction operation is adopted, the photocatalysis and the membrane water outlet process can be separately carried out in time sequence.
7) The immersed membrane component in the A1 area can effectively separate treated water from catalyst particles, simultaneously can intercept undecomposed pollutants according to the interception performance of the membrane, and conveniently controls the concentration of pollutants in the photocatalytic reactor by controlling the operating conditions such as photocatalytic oxidation pretreatment time, membrane water outlet flux and the like, thereby being beneficial to improving the photocatalytic reaction efficiency.
Drawings
FIG. 1 is a structural diagram of an integrated photocatalytic oxidation-membrane separation circulating fluidized bed reaction device;
FIG. 2 is a sectional view taken along line A-A in FIG. 1.
Detailed Description
The structure of the invention will be described in detail below with reference to fig. 1 and specific implementation.
As shown in fig. 1, the integrated photocatalytic oxidation-membrane separation circulating fluidized bed reaction apparatus is divided into a cylindrical housing 2 and a concentric cylindrical sleeve 6 connected to the housing. A water inlet and a sludge discharge port are arranged below the shell 2, aeration devices 5 are uniformly arranged under the sleeve 6, an immersed membrane component 1 is arranged in the area of the sleeve 6, and the membrane component 1 is connected with a water outlet. Three low-pressure ultraviolet lamps 4 are arranged in a certain range of the circle centers of the concentric circles of the shell 2 and the cylindrical sleeve 6 at equal intervals and are arranged in a reaction area between the shell 2 and the cylindrical sleeve 6, the included angle between the three low-pressure ultraviolet lamps is 120 degrees, and a liquid level meter is fixed in the cylindrical sleeve. The distance between the low-pressure ultraviolet lamp and the membrane component is large, and damage to the membrane component is avoided.
As shown in the figure, the photocatalytic oxidation-membrane separation circulating fluidized bed reaction system is divided into two reaction areas A1 and A2, and the operation process is as follows:
first, water enters the apparatus from the water inlet, and under the action of the bubbles generated by the aeration means, the sewage moves upward in the area A1, and comes into full contact with the catalyst in the jacket. Then the water flow moves to the area A2 under the driving action of the aeration facility and is irradiated by the ultraviolet lamp, so that pollutants in the sewage are effectively removed. Meanwhile, the membrane module positioned in the A2 area can effectively remove catalyst TiO2And (4) intercepting and finally draining water from a water outlet above. The water level in the reactor is reduced due to the membrane water outlet, when the water level reaches a low water level, the water inlet pump automatically feeds water under the sensing of the liquid level meter, and when the water inlet reaches a high water level, the water inlet pump automatically stops feeding water. Under the action of the aeration device, solid, liquid and gas phases in the whole device are fully mixed to form a three-phase fluidized bed system. The residual gas and sludge residue are discharged from a sludge discharge port below the device.
Claims (9)
1. The utility model provides an integral type photocatalytic oxidation-membrane separation circulating fluidized bed reaction unit, includes casing (2), ultraviolet source, membrane module (1), cylindrical sleeve pipe (6) and aeration equipment (5), its characterized in that: the bottom of the shell (2) is provided with a water inlet, the aeration device (5), the cylindrical sleeve (6), the ultraviolet light source and the membrane assembly (1) are respectively arranged inside the shell (2), a water outlet of the membrane assembly (1) is connected with a water outlet of the shell (2), the cylindrical sleeve (6) is connected with the upper end of the shell (2), the bottom of the shell (2) is provided with a sludge discharge port, and the distance between the ultraviolet light source and the membrane assembly (1) is greater than the penetration distance of ultraviolet light.
2. The integrated photocatalytic oxidation-membrane separation circulating fluidized bed reaction device according to claim 1, wherein: the membrane module (1) is an immersed membrane module.
3. The integrated photocatalytic oxidation-membrane separation circulating fluidized bed reaction device according to claim 1, wherein: the aeration device (1) is horizontally arranged at the bottom of the shell (2), and the aeration device (1) can also be annularly arranged at the bottom of the shell (2).
4. The integrated photocatalytic oxidation-membrane separation circulating fluidized bed reaction device according to claim 1, wherein: the ultraviolet light source and the membrane module (1) are distributed around the membrane module (1) in the shell (2), and the included angle between the ultraviolet light sources is 120 degrees.
5. The integrated photocatalytic oxidation-membrane separation circulating fluidized bed reaction device according to claim 1, wherein: the ultraviolet light source is a low-pressure ultraviolet lamp (3) and a quartz sleeve or a quartz cold trap sleeve (4) arranged on the outer cover of the low-pressure ultraviolet lamp.
6. The integrated photocatalytic oxidation-membrane separation circulating fluidized bed reaction device according to claim 1, wherein: the shell (2) is cylindrical in shape.
7. The integrated photocatalytic oxidation-membrane separation circulating fluidized bed reaction device according to claim 1, wherein: the bottom of the shell (2) is also provided with a sludge discharge port.
8. The integrated photocatalytic oxidation-membrane separation circulating fluidized bed reaction device according to claim 1, wherein: a cylindrical sleeve (6) which is concentric with the shell is arranged in the shell (2).
9. The integrated photocatalytic oxidation-membrane separation circulating fluidized bed reaction device according to claim 1, wherein: a liquid level meter is arranged in the shell (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811218987.9A CN111072126A (en) | 2018-10-19 | 2018-10-19 | Integrated photocatalytic oxidation-membrane separation circulating fluidized bed reaction device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811218987.9A CN111072126A (en) | 2018-10-19 | 2018-10-19 | Integrated photocatalytic oxidation-membrane separation circulating fluidized bed reaction device |
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| Publication Number | Publication Date |
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| CN111072126A true CN111072126A (en) | 2020-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811218987.9A Pending CN111072126A (en) | 2018-10-19 | 2018-10-19 | Integrated photocatalytic oxidation-membrane separation circulating fluidized bed reaction device |
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| CN (1) | CN111072126A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1994545A (en) * | 2006-12-05 | 2007-07-11 | 天津工业大学 | Integrated photo-catalytic oxidation membrane-separation fluidized bed reactor |
| CN202880955U (en) * | 2012-11-16 | 2013-04-17 | 山东建筑大学 | Photocatalytic sterilizing reactor |
| CN105174361A (en) * | 2015-09-08 | 2015-12-23 | 天津工业大学 | Integral photocatalytic oxidization-membrane separation three-phase fluidized bed reaction device |
| CN205099517U (en) * | 2015-11-05 | 2016-03-23 | 山东黄河三角洲纺织科技研究院有限公司 | Integral type light catalytic oxidation - membrane separation three -phase fluidized bed reaction device |
| CN105481051A (en) * | 2015-12-08 | 2016-04-13 | 天津工业大学 | Integrated photoelectrocatalysis-membrane separation fluidized bed reaction device |
-
2018
- 2018-10-19 CN CN201811218987.9A patent/CN111072126A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1994545A (en) * | 2006-12-05 | 2007-07-11 | 天津工业大学 | Integrated photo-catalytic oxidation membrane-separation fluidized bed reactor |
| CN202880955U (en) * | 2012-11-16 | 2013-04-17 | 山东建筑大学 | Photocatalytic sterilizing reactor |
| CN105174361A (en) * | 2015-09-08 | 2015-12-23 | 天津工业大学 | Integral photocatalytic oxidization-membrane separation three-phase fluidized bed reaction device |
| CN205099517U (en) * | 2015-11-05 | 2016-03-23 | 山东黄河三角洲纺织科技研究院有限公司 | Integral type light catalytic oxidation - membrane separation three -phase fluidized bed reaction device |
| CN105481051A (en) * | 2015-12-08 | 2016-04-13 | 天津工业大学 | Integrated photoelectrocatalysis-membrane separation fluidized bed reaction device |
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Application publication date: 20200428 |
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