CN109179820B - Novel external suspension photocatalytic film water purifier - Google Patents
Novel external suspension photocatalytic film water purifier Download PDFInfo
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- CN109179820B CN109179820B CN201811147728.1A CN201811147728A CN109179820B CN 109179820 B CN109179820 B CN 109179820B CN 201811147728 A CN201811147728 A CN 201811147728A CN 109179820 B CN109179820 B CN 109179820B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 187
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- 239000000725 suspension Substances 0.000 title claims description 4
- 239000012528 membrane Substances 0.000 claims abstract description 71
- 238000000926 separation method Methods 0.000 claims abstract description 46
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 41
- 230000004913 activation Effects 0.000 claims abstract description 24
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- 239000007788 liquid Substances 0.000 claims description 38
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- 239000011941 photocatalyst Substances 0.000 claims description 13
- 239000012510 hollow fiber Substances 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 7
- 238000007146 photocatalysis Methods 0.000 claims description 7
- 239000004575 stone Substances 0.000 claims description 7
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- 230000003213 activating effect Effects 0.000 abstract description 3
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- 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
- C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
-
- 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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
Abstract
The invention discloses a novel external suspended photocatalytic film water purifier, which comprises: the device comprises a water inlet tank, a water pump, a first filter, an activated carbon filter, a photocatalytic reactor, a membrane separation system, an activation mineralization device, a reflux pump, a suction pump, first to sixth electromagnetic valves and an air compressor, wherein the water inlet tank is sequentially connected with the water pump, the first filter and the activated carbon filter; the active carbon filter is connected with the photocatalytic reactor, the photocatalytic reactor is connected with the membrane separation system after being connected with the sixth electromagnetic valve, a first water outlet of the photocatalytic reactor is sequentially connected with the three-way valve and the suction pump, the suction pump is connected with the fifth electromagnetic valve and then is connected with the activation mineralization device, and a second water outlet of the photocatalytic reactor is connected with the third electromagnetic valve and then is connected with the photocatalytic reactor; an aeration pipe is arranged in the photocatalytic reactor, and a microporous aeration mechanism is arranged in the membrane separation system and is connected to the air compressor through pipelines respectively. The invention can enhance the catalytic efficiency and the pollution resistance of the membrane and reduce the operation energy consumption; the treated water is large, and the water quality activating and mineralizing functions are achieved.
Description
Technical Field
The invention relates to a novel external suspension photocatalytic film water purifier, and belongs to the technical field of water purifiers.
Background
The water is the source of life, the life is the origin, the water is everywhere in human body and is closely related to human health, however, along with the high-speed development of modern industrial and agricultural production, the water resource in the living environment of human is short, the drinking water is seriously polluted, and the conventional water purifying process can not meet the requirements of people on the quality of living drinking water, so that the water purifying process has to be modified on the basis of the traditional process, and new technology is developed.
Photocatalytic oxidation technology is an emerging and promising technology for water treatment, which uses photoexcited hydroxyl radicals (. OH) and peroxy radicals (. O) 2 - ) Mineralizing toxic and harmful macromolecular organic matters in water into nontoxic and harmless micromolecular inorganic matters such as CO 2 、H 2 O, etc., thereby thoroughly removing contaminants in the water. Wherein nano TiO 2 As a photocatalyst which is most commonly used, the photocatalyst has the advantages of high efficiency, high stability, low cost, low selectivity and no harm to the environment. Fixed TiO 2 In comparison, suspended TiO 2 Has the advantages of small particle size, less mass transfer, large reaction area and high catalytic efficiency, but has a plurality of factors which restrict the application of suspended photocatalytic technology, such as TiO 2 Difficult separation and recovery, batch reactor operation, inability to operate continuously, and improved photocatalytic efficiency.
In recent years, technologies for coupling and separating photocatalysis and membrane separation and recovering catalysts are gradually rising, and the technologies become a research hot spot. The technology mainly uses the high-efficiency interception function of the membrane to intercept the photocatalyst, and the water solution permeates the membrane to achieve the effect of solid-liquid separation. The immersion type photocatalytic film reactor is mostly adopted in the currently applied patent, and has many advantages in use, such as high reaction rate, large treatment capacity, easy operation and sustainable catalyst recovery and reuse, but is very troublesome in the aspect of film component replacement and cleaning, and a baffle is also often arranged between a lamp and a film component to prevent ultraviolet light from directly irradiating an organic film, so that the utilization rate of the ultraviolet lamp is reduced, and the film is seriously polluted. In addition, the traditional external photocatalytic film reactor has the advantages of early appearance time, easy replacement and cleaning of the film component compared with immersion type film component, high operating pressure, high energy consumption, small water treatment amount and serious film pollution.
Disclosure of Invention
The invention aims to solve the technical problems of overcoming the defects of the prior art, providing a novel external suspended photocatalytic film water purifier and solving the problems of low catalytic efficiency, high energy consumption, small water treatment amount and serious film pollution of the traditional external photocatalytic film reactor.
The technical scheme adopted by the invention specifically solves the technical problems as follows:
a novel external suspended photocatalytic film water purifier, comprising: the device comprises a water inlet tank, a water pump, a first filter, an activated carbon filter, a photocatalytic reactor, a membrane separation system, an activation mineralization device, a reflux pump, a suction pump, first to sixth electromagnetic valves and an air compressor, wherein a water outlet of the water inlet tank is connected with the water pump through a pipeline, and the water pump is connected with a water inlet of the first filter through a pipeline; the water outlet of the first filter is connected with the water inlet of the activated carbon filter through a pipeline; the water outlet of the activated carbon filter is connected with the water inlet of the photocatalytic reactor, and the water outlet of the photocatalytic reactor is connected with the water inlet of the membrane separation system after being connected with a sixth electromagnetic valve through a pipeline; the first water outlet of the membrane separation system is sequentially connected with a three-way valve and a water pumping port of a suction pump through a pipeline, the water outlet of the water pumping pump is connected with a water inlet of an activation mineralization device after being connected with a fifth electromagnetic valve through a pipeline, and the second water outlet of the membrane separation system is connected with a water inlet of a photocatalytic reactor after being connected with a third electromagnetic valve through a pipeline; an aeration pipe is arranged in the photocatalytic reactor, and is connected to the air compressor after being sequentially connected with a first electromagnetic valve and a multi-way valve through pipelines; a microporous aeration mechanism is arranged in the membrane separation system and is connected to the air compressor after being sequentially connected with a second electromagnetic valve and a multi-way valve through pipelines; one end of the fourth valve is connected with the multi-way valve through a pipeline, and the other end of the fourth valve is connected with the three-way valve through a pipeline; and taking the water outlet of the activation mineralization device as the water outlet of the water purifier.
Further, as a preferable technical scheme of the invention: the photocatalysis reactor comprises a closed shell, a quartz sleeve, an ultraviolet lamp and an ultraviolet lamp controller, wherein the quartz sleeve is arranged in the closed shell, and the ultraviolet lamp is hermetically arranged in the quartz sleeve; the ultraviolet lamp controller is electrically connected with the ultraviolet lamp; and a photocatalyst is filled between the closed shell and the quartz sleeve.
Further, as a preferable technical scheme of the invention: and the first filter is internally filled with a PP cotton filter element.
Further, as a preferable technical scheme of the invention: the device also comprises a liquid level sensor and a liquid level controller, wherein the liquid level sensor and the liquid level controller are used for detecting the liquid level height in the photocatalytic reactor, the liquid level sensor is electrically connected with the liquid level controller, and the liquid level controller is electrically connected with the water pump.
Further, as a preferable technical scheme of the invention: the membrane separation system comprises a separation cylinder and an external pressure type hollow fiber membrane component arranged in the separation cylinder.
Further, as a preferable technical scheme of the invention: the external pressure type hollow fiber membrane component adopts a filtering membrane, and the filtering membrane is made of PP or PVDF, PES, PAN, PS, PE.
Further, as a preferable technical scheme of the invention: the activation mineralization device is internally provided with a mixed filter consisting of coconut shell activated carbon, medical stone and Muyu stone.
Further, as a preferable technical scheme of the invention: the device also comprises a flowmeter, wherein the flowmeter is arranged on the pipeline connected with the aeration pipe and the first electromagnetic valve.
Further, as a preferable technical scheme of the invention: the suction pump is connected with the pipeline connected with the fifth electromagnetic valve.
Further, as a preferable technical scheme of the invention: the electromagnetic valve controller is electrically connected with each electromagnetic valve.
By adopting the technical scheme, the invention can produce the following technical effects:
the novel external suspended photocatalytic membrane water purifier disclosed by the invention is combined with the external membrane separation system, so that the problem that a catalyst is difficult to separate can be solved, the repeated use of the catalyst is ensured, and the single-side dead-end hollow fiber membrane component is used in the membrane separation system. In addition, microporous aeration is also arranged in the membrane separation system, membrane pollution can be slowed down under the scouring action of water flow and bubbles, and the membrane is automatically and regularly subjected to air backwashing, so that the high flux of the membrane can be maintained, and the service life of the membrane can be prolonged.
In addition, the PP cotton filter element and the granular activated carbon are used as a pretreatment filtering system of the reactor, so that suspended matters and colloid substances in water can be effectively removed, the turbidity of water body can be reduced, and part of metal substances can be removed, thereby ensuring the transmission of ultraviolet light and ensuring the photocatalysis reaction rate. Further, self-made powdery nano TiO is used in the photocatalytic reactor 2 The photocatalysis reaction rate is improved; the aeration pipe can generate a large amount of bubbles to accelerate the internal circulation and the full mixing of the reactor, thereby ensuring the catalytic efficiency.
The invention provides a novel continuous external suspended photocatalytic film water purifier which can reduce film pollution and lower operating pressure on the premise of keeping higher catalytic efficiency by improving the traditional external photocatalytic film reactor, so that the catalytic efficiency and the film anti-pollution capability of the novel continuous external suspended photocatalytic film water purifier are enhanced, and the operation energy consumption is reduced; the water purifier is used for treating micro-polluted water and drinking water, has large water treatment amount, can effectively remove small molecular natural organic matters in large water amount, can greatly reduce cancerogenic substances, bacteria and the like in water, and has the function of activating mineralized water quality.
Drawings
Fig. 1 is a schematic structural diagram of the novel external suspended photocatalytic film water purifier.
FIG. 2 is a schematic diagram of the structure of the activation mineralization device of the present invention.
Wherein the reference numerals explain: the device comprises a water inlet tank 1, a water pump 2, a first filter 3, an activated carbon filter 4, a photocatalytic reactor 5, an ultraviolet lamp 5-1, a quartz sleeve 5-2, a closed shell 5-3, an aerator pipe 5-4, an ultraviolet lamp controller 5-5 and a liquid level controller 5-6; a membrane separation system 6, a hollow fiber membrane module 6-1 and a microporous aeration mechanism 6-2; the activation mineralization device 7, the flowmeter 8-1, the air compressor 9, the reflux pump 10, the suction pump 11, the three-way valve 12, the first electromagnetic valve 13-1, the second electromagnetic valve 13-2, the third electromagnetic valve 13-3, the fourth electromagnetic valve 13-4, the fifth electromagnetic valve 13-5, the sixth electromagnetic valve 13-6, the one-way valve 14 and the electromagnetic valve controller 15.
Detailed Description
Embodiments of the present invention will be described below with reference to the drawings.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As shown in FIG. 1, the invention designs a novel external suspended photocatalytic film water purifier, which comprises: the water inlet tank 1, the water pump 2, the first filter 3, the activated carbon filter 4, the photocatalytic reactor 5, the membrane separation system 6, the activation mineralization device 7, the reflux pump 10, the suction pump 11, the three-way valve 12, the first to sixth electromagnetic valves and the air compressor 9, wherein a water outlet of the water inlet tank 1 is connected with the water pump 2 through a pipeline, and the water pump 2 is connected with a water inlet of the first filter 3 through a pipeline; the water outlet of the first filter 3 is connected with the water inlet of the activated carbon filter 4 through a pipeline; the water outlet of the activated carbon filter 4 is connected with the water inlet of the photocatalytic reactor 5, and the water outlet of the photocatalytic reactor 5 is connected with the water inlet of the membrane separation system 6 after being connected with the sixth electromagnetic valve 13-6 through a pipeline; the first water outlet of the membrane separation system 6 is sequentially connected with a three-way valve 12 and a water pumping port of a suction pump 11 through a pipeline, the water outlet of the suction pump 11 is connected with a water inlet of an activation mineralization device 7 after being connected with a fifth electromagnetic valve 13-5 through a pipeline, and the second water outlet of the membrane separation system 6 is connected with a water inlet of a photocatalytic reactor 5 after being connected with a third electromagnetic valve 13-3 through a pipeline; an aeration pipe 5-4 is arranged in the photocatalytic reactor 5, and the aeration pipe 5-4 is connected with a first electromagnetic valve 13-1 and a multi-way valve in sequence through a pipeline and then connected to an air compressor 9; a microporous aeration mechanism is arranged in the membrane separation system 6 and is connected with a second electromagnetic valve 13-2 and a multi-way valve in sequence through a pipeline and then connected to an air compressor 9; one end of the fourth valve 13-4 is connected with the multi-way valve through a pipeline, and the other end of the fourth valve 13-4 is connected with the three-way valve 12 through a pipeline; and the water outlet of the activation mineralization device 7 is used as the water outlet of the water purifier.
The first filter 3 is preferably internally filled with a PP cotton filter core, so that various particle impurities in the filtered liquid can be effectively removed; the pretreatment system composed of the first filter and the granular activated carbon filter is used for removing granular substances and metal substances in the inflow water to a large extent, so that the subsequent photocatalytic reaction rate is ensured, and the efficient and stable operation of the device is maintained.
The photocatalysis reactor 5 mainly comprises a metal closed shell 5-3, a quartz sleeve 5-2, an ultraviolet lamp 5-1 and an ultraviolet lamp controller 5-5, wherein the quartz sleeve 5-2 is arranged in the closed shell 5-3, and the ultraviolet lamp 5-1 is hermetically arranged in the quartz sleeve 5-2; the ultraviolet lamp controller 5-5 is electrically connected with the ultraviolet lamp 5-1; and a photocatalyst is filled between the closed shell 5-3 and the quartz sleeve 5-2. Wherein, the ultraviolet lamp 5-1 is filled in the quartz sleeve 5-2, the starting of the light source is controlled by the ultraviolet lamp controller 5-5, the power of the ultraviolet lamp is selected to be 50w, the chemical adsorption effect of the catalyst can be improved by increasing the temperature of the reaction liquid, the activation energy is reduced, the catalytic reaction rate is improved, and in addition, the ultraviolet light has stronger sterilization effect and replaces the traditional chlorine sterilization.
In this example, the photocatalyst is powdered nano TiO 2 The particle size of the particles is generally between ten and several hundred nanometers, and TiO 2 The concentration of the solution is 0.5-2.5g/L. The catalyst is prepared by sol-gel method, and is selected fromButyl titanate is used as a titanium source, and the specific process is as follows: (1) preparing an ethanol aqueous solution of butyl titanate; (2) Adding acetic acid into the solution to form sol, (3) aging the sol to form gel; (4) Gel drying and calcining to obtain powdery nano TiO 2 。
Preferably, the water purifier further comprises a liquid level sensor and a liquid level controller 5-6 for detecting the liquid level in the photocatalytic reactor, wherein the liquid level sensor is electrically connected with the liquid level controller 5-6, and the liquid level controller 5-6 is electrically connected with the water pump 2. In this embodiment, a liquid level sensor is disposed in the sealed housing 5-3 of the photocatalytic reactor 5, and the liquid level sensor is electrically connected to the water pump 2 after being connected to the liquid level controller 5-6, where the liquid level controller 5-6 can be used to control the start and stop of the water pump. When the liquid level of the photocatalytic reactor 5 detected by the liquid level sensor is lower than a set level, the liquid level controller 5-6 controls the water pump 2 to be started, the inlet water is processed by the water inlet tank 1 through the first filter 3 of the PP cotton filter core and the granular activated carbon filter 4 and then enters the photocatalytic reactor 5, and when the liquid level in the photocatalytic reactor 5 detected by the liquid level sensor is higher than the set level, the liquid level controller 5-6 controls the water pump 2 to stop running, so that the processed water quantity in the photocatalytic reactor 5 is ensured to be kept stable.
The membrane separation system 6 comprises a separation cylinder and an external pressure type hollow fiber membrane component 6-1 arranged at the single-side dead end in the separation cylinder, wherein the external pressure type hollow fiber membrane component 6-1 preferably adopts a micro-filtration membrane or an ultra-filtration membrane, and the material of the filtration membrane can be PP or PVDF, PES, PAN, PS, PE.
The structure of the activation mineralization device 7 is as shown in fig. 2, and a mixed filter consisting of coconut shell activated carbon 7-1, medical stone 7-2 and Muyu stone 7-3 is arranged in the activation mineralization device in sequence in fig. 2 or in other arrangement modes, and the activation mineralization device is not limited by the invention. The produced water of the membrane separation system 6 is filtered by three filter elements in sequence, the produced water can be directly drunk, and the water contains a plurality of mineral elements beneficial to human bodies, so that the mineral beneficial to the human bodies can be provided. Certain distance is reserved between different filter material layers in the device, so that the filter material is convenient to install and detach.
The photocatalytic reactor 5 and the membrane separation system 6 are respectively provided with an aeration pipe 5-4 and a microporous aeration system 6-2, which are connected with a corresponding electromagnetic valve and a multiway valve through pipelines and then connected with an air compressor 9; the photocatalysis reactor 5 is provided with an aeration pipe 5-4 for perforation aeration, so that the turbulence degree of fluid in the reactor is enhanced, and a microporous aeration mechanism 6-2 is arranged at the water outlet end of the membrane separation system 6, so that the scouring of the surface of the membrane is enhanced; the device also comprises a flowmeter 8-1, wherein the flowmeter 8-1 is arranged on a pipeline connected with the aeration pipe 5-4 and the first electromagnetic valve 13-1 and is used for detecting the flow of liquid in the pipeline; further, the electromagnetic valve control device further comprises an electromagnetic valve controller 15, wherein the electromagnetic valve controller 15 is electrically connected with each electromagnetic valve, so that the opening of the electromagnetic valve is controlled by the electromagnetic valve controller 15 in a centralized manner.
The water purifier also comprises a one-way valve 14, wherein the one-way valve 14 is arranged on a pipeline connected with the suction pump and the fifth electromagnetic valve 13-5, so that liquid delivery is realized and backflow is prevented.
The working principle of the invention is as follows:
firstly, raw water in a water inlet tank 1 is introduced into a pretreatment system consisting of a first filter 3 of a PP cotton filter element and a granular activated carbon filter 4 by a water pump 2, pretreated yielding water is connected between a sealed shell 5-3 of a suspended photocatalytic reactor 5 and a quartz sleeve 5-2 through a pipeline, an ultraviolet lamp controller 5-5 controls an ultraviolet lamp 5-1 to be started, ultraviolet light irradiated by a light source combines with photocatalyst in the ultraviolet lamp to sterilize and perform photocatalytic treatment on the yielding water, then a water outlet of the sealed shell 5-3 of the photocatalytic reactor 5 is introduced into a separation barrel of a membrane separation system 6 through a pipeline through a sixth electromagnetic valve 13-6, the yielding water is filtered through an external pressure type hollow fiber membrane component 6-1 in the barrel, the yielding water enters a multifunctional activation mineralizing device 7 through a first water outlet of the separation barrel, the yielding water is discharged through a water outlet of the multi-functional activation mineralizing device, the yielding water can be directly drunk, and concentrated water in the separation barrel can return to the photocatalytic reactor 5 through a backflow pipeline under the action of a backflow pump 10, and the concentrated water is filled into the water inlet of the sealed shell 5-3 of the photocatalytic reactor through a water inlet of the backflow pump.
Then, the opening of each solenoid valve is controlled by the solenoid valve controller 15, and when the solenoid valve controller 15 controls the first solenoid valve 13-1 and the second solenoid valve 13-2 to open and the fourth solenoid valve 13-4 to closeWhen the air is introduced into the multi-way valve through the air compressor 9, the flowmeter 8-1 detects the gas flow in the pipeline, the aeration pipe 5-4 arranged in the photocatalytic reactor 5 aerates the inside of the sealed shell 5-3, the internal circulation of liquid and photocatalyst can be promoted through the air flow, the photocatalytic efficiency is improved, and the surface of the film is flushed to slow down the film pollution; when the electromagnetic valve controller 15 controls the fourth electromagnetic valve 13-4 to be opened and the first electromagnetic valve 13-1 and the second electromagnetic valve 13-2 to be closed, the microporous aeration system 6-2 exhausts air from the separating cylinder, air enters the filtering membrane of the hollow fiber membrane component 6-1 from the water inlet of the separating cylinder of the membrane separating system 6, and part of photocatalyst particles are separated from the surface of the membrane by utilizing strong recoil of the air, so that the water treatment capacity of the membrane is improved, the service life of the membrane is prolonged, and then the effluent is discharged into the activation mineralization device 7 through the first water outlet. And in the operation process, the suction pump 11 is started, and simultaneously, the third electromagnetic valve 13-3 is opened, the concentrated water in the membrane separation system 6 is filtered by the hollow fiber filter membrane under the suction effect, and the mixed solution is in powder TiO 2 The water which is trapped and returned to the photocatalytic reactor 5 through the second water outlet of the separating cylinder under the action of the reflux pump 10, and the water which is discharged from the first water outlet of the separating cylinder of the membrane separation system 6 enters the water inlet of the multi-functional activation mineralization device 7 through the pipeline, the three-way valve 12, the suction pump 11, the one-way valve 14 and the fifth electromagnetic valve 13-5.
The multifunctional activation mineralization device 7 is internally provided with a mixed filter of three filter elements of coconut shell activated carbon 7-1, medical stone 7-2 and wooden fish 7-3, membrane produced water discharged from a separation cylinder sequentially passes through the three filter elements to be filtered, a water outlet is used as a water outlet of the water purifier, the water can be directly drunk, and the water contains a plurality of mineral elements beneficial to human bodies.
When the photocatalytic reactor 5 continuously runs, the suction pump 11 and the reflux pump 10 are started, the electromagnetic valve controller 15 starts the first electromagnetic valve 13-1 and the second electromagnetic valve 13-2, the fourth electromagnetic valve 13-4 is closed, when the photocatalytic reactor is in regular recoil, the suction pump 11 is closed, the sixth electromagnetic valve 13-6 is closed, the electromagnetic valve controller 15 starts the fourth electromagnetic valve 13-4, and the first electromagnetic valve 13-1 and the second electromagnetic valve 13-2 are closed for gas recoil.
The water purifier can be combined with an external membrane separation system, so that the problem that a catalyst is difficult to separate can be solved, the repeated use of the photocatalyst is ensured, and compared with the traditional external membrane component, the single-side dead-end hollow fiber membrane component is used in the membrane separation system, the operation pressure is lower, the water flux is larger, and the pollution resistance is stronger.
Examples of specific applications of the present invention are set forth below to demonstrate that the present invention can slow down membrane fouling and increase the rate of photocatalytic reactions.
Example 1,
In this example, water in a certain area is taken, its water quality index is TOC 2.5+ -0.3 mg/L, turbidity is 1.5-2, pH is 6.25-6.5, and total bacteria count is 10 3 CFU/mL, treatment was performed under the following conditions:
filling the photocatalytic reactor with photocatalyst concentration: 1g/L;
average photocatalytic reactor residence time (HRT): 30min;
after the water is treated by the purifier, the water quality index of the water outlet is 0.5+/-0.05 mg/L, the turbidity is 0.1, and the total number of bacteria is 0; the TOC average removal rate was 80%, the turbidity average removal rate was 95%, and the bacterial removal rate was 100%.
EXAMPLE 2,
In the embodiment, tap water in the region is taken, and the water quality index is COD Mn 1.8.+ -. 0.5mg/L, TOC 2.1.+ -. 0.2mg/L, total bacteria 70CFU/mL, under the following conditions:
filling the photocatalytic reactor with photocatalyst concentration: 1g/L;
average photocatalytic reactor residence time (HRT): 30min;
after the treatment by the purifier, the water quality index of the outlet water obtained from the water outlet is COD Mn 0.5+/-0.05 mg/L, 0.3+/-0.02 mg/L TOC and 0 total bacteria; COD (chemical oxygen demand) Mn The average removal rate was 73%, the TOC average removal rate was 86%, and the bacterial removal rate was 100%.
EXAMPLE 3,
In this example, commercial humate is used to prepare water to be treated, TOC is 4.0+ -0.2 mg/L, pH is about 7.0, UV 254 0.3+ -0.05 cm -1 The treatment was performed under the following conditions:
filling the photocatalytic reactor with catalyst concentration: 1g/L;
average photocatalytic reactor residence time (HRT): 30min;
after the water is treated by the purifier, the water quality index of the water outlet is 1.28+/-0.1 mg/L, and the water quality index is UV 254 0.03+ -0.01 cm -1 The method comprises the steps of carrying out a first treatment on the surface of the TOC average removal of 68%, UV 254 The average removal rate was 90%.
In conclusion, the invention can lower operating pressure, lighten membrane pollution, strengthen the catalytic efficiency and the membrane pollution resistance and reduce the operation energy consumption on the premise of keeping higher catalytic efficiency; the water purifier is used for treating micro-polluted water and drinking water, has large water treatment amount, can effectively remove small molecular natural organic matters in large water amount, can greatly reduce cancerogenic substances, bacteria and the like in water, and has the function of activating mineralized water quality.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (8)
1. Novel external suspension photocatalytic film water purifier, its characterized in that includes: the device comprises a water inlet tank, a water pump, a first filter, an activated carbon filter, a photocatalytic reactor, a membrane separation system, an activation mineralization device, a reflux pump, a suction pump, first to sixth electromagnetic valves and an air compressor, wherein a water outlet of the water inlet tank is connected with the water pump through a pipeline, and the water pump is connected with a water inlet of the first filter through a pipeline; the water outlet of the first filter is connected with the water inlet of the activated carbon filter through a pipeline; the water outlet of the activated carbon filter is connected with the water inlet of the photocatalytic reactor, and the water outlet of the photocatalytic reactor is connected with the water inlet of the membrane separation system after being connected with a sixth electromagnetic valve through a pipeline; the first water outlet of the membrane separation system is sequentially connected with a three-way valve and a water pumping port of a suction pump through a pipeline, the water outlet of the suction pump is connected with a water inlet of an activation mineralization device after being connected with a fifth electromagnetic valve through a pipeline, and the second water outlet of the membrane separation system is connected with a water inlet of a photocatalytic reactor after being connected with a third electromagnetic valve through a pipeline; an aeration pipe is arranged in the photocatalytic reactor, and is connected to the air compressor after being sequentially connected with a first electromagnetic valve and a multi-way valve through pipelines; a microporous aeration mechanism is arranged in the membrane separation system and is connected to the air compressor after being sequentially connected with a second electromagnetic valve and a multi-way valve through pipelines; one end of the fourth electromagnetic valve is connected with the multi-way valve through a pipeline, and the other end of the fourth electromagnetic valve is connected with the three-way valve through a pipeline; and taking the water outlet of the activation mineralization device as the water outlet of the water purifier;
the photocatalysis reactor comprises a closed shell, a quartz sleeve, an ultraviolet lamp and an ultraviolet lamp controller, wherein the quartz sleeve is arranged in the closed shell, and the ultraviolet lamp is hermetically arranged in the quartz sleeve; the ultraviolet lamp controller is electrically connected with the ultraviolet lamp; a photocatalyst is filled between the closed shell and the quartz sleeve;
the activation mineralization device is internally provided with a mixed filter consisting of coconut shell activated carbon, medical stone and Muyu stone.
2. The novel external suspended photocatalytic film water purifier as recited in claim 1, wherein: and the first filter is internally filled with a PP cotton filter element.
3. The novel external suspended photocatalytic film water purifier as recited in claim 1, wherein: the device also comprises a liquid level sensor and a liquid level controller, wherein the liquid level sensor and the liquid level controller are used for detecting the liquid level height in the photocatalytic reactor, the liquid level sensor is electrically connected with the liquid level controller, and the liquid level controller is electrically connected with the water pump.
4. The novel external suspended photocatalytic film water purifier as recited in claim 1, wherein: the membrane separation system comprises a separation cylinder and an external pressure type hollow fiber membrane component arranged in the separation cylinder.
5. The novel external suspended photocatalytic film water purifier as recited in claim 4, wherein: the external pressure type hollow fiber membrane component adopts a filtering membrane, and the filtering membrane is made of PP or PVDF, PES, PAN, PS, PE.
6. The novel external suspended photocatalytic film water purifier as recited in claim 1, wherein: the device also comprises a flowmeter, wherein the flowmeter is arranged on the pipeline connected with the aeration pipe and the first electromagnetic valve.
7. The novel external suspended photocatalytic film water purifier as recited in claim 1, wherein: the suction pump is connected with the pipeline connected with the fifth electromagnetic valve.
8. The novel external suspended photocatalytic film water purifier as recited in claim 1, wherein: the electromagnetic valve controller is electrically connected with each electromagnetic valve.
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| CN1410373A (en) * | 2002-11-22 | 2003-04-16 | 武汉理工大学 | High adsorptivity, photo catalytic and mineralization treatment unit for drinking water |
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