CN113044914A - Taylor vortex type photocatalytic water treatment test device and test method - Google Patents
Taylor vortex type photocatalytic water treatment test device and test method Download PDFInfo
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
-
- 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
- C02F1/325—Irradiation devices or lamp constructions
-
- 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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- 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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
-
- 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
- C02F2201/009—Apparatus with independent power supply, e.g. solar cells, windpower, fuel cells
-
- 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
-
- 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
Abstract
The invention discloses a Taylor vortex type photocatalytic water treatment test device which can be used for purifying and treating landscape water, sewage (waste) water and black and odorous water and comprises an outer barrel and an inner barrel which are concentrically arranged and can relatively rotate, wherein the outer barrel is sleeved outside the inner barrel, the inner barrel can be completely or partially arranged inside the outer barrel, the inner barrel is driven to rotate by a motor, an ultraviolet lamp is arranged in the inner barrel, the inner barrel has light transmittance, a photocatalytic reaction channel is arranged between the outer barrel and the inner barrel, a catalyst is arranged in the photocatalytic reaction channel, and a water inlet and a water outlet are formed in the outer barrel. According to the Taylor vortex type photocatalytic water treatment test device and the test method, the influence condition of factors in photocatalytic reaction on the photocatalytic reaction can be determined very clearly by controlling a variable method, the optimal test condition can be found out in multiple tests, the photocatalytic reaction efficiency is improved, the whole device is simple in structure, low in cost and convenient to apply, and the test method is simple, direct, rapid and accurate.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a Taylor vortex type photocatalytic water treatment test device and a test method.
Background
Japanese scientists a.fujishima and k.honda in 1972 discovered that irradiated Ti02 single crystal electrodes could decompose water, and attracted the interest of technologists in photo-induced redox reactions, thereby driving the interest of organic and inorganic photo-redox reactions.
Photocatalytic oxidation is a process that uses Ultraviolet (UV) radiation in combination with an oxidizing agent. Under the excitation of ultraviolet light, the oxidant is decomposed to generate free radicals (such as 0H) with stronger oxidizing power and active oxygen. Hydroxyl radicals have a very high oxidizing electrode potential (2.80v), second only to F (3.06 v). The electron affinity of the material is 596.3KJ, and the material is easy to attack high electron cloud density points. This determines that the 0H-attack is fast and can react with contaminants in water indiscriminately by electron transfer and addition reactions. By breaking chain and breaking bond, the pollutants are oxidized into carbon dioxide and water, and partial substances are directly mineralized into salt, so that secondary pollution is avoided. This makes it have strong photooxidation-reduction function, can oxidize and decompose various organic compounds and partial inorganic substances, can destroy the cell membrane of bacteria and solidify the protein of virus, and can oxidize
Many recalcitrant organic pollutants that cannot be decomposed with oxidizing agents alone. The combined use of ultraviolet light and oxidant makes the photocatalytic oxidation far exceed the generation of hydroxyl radical 0H. by light induction no matter on the oxidation capacity or reaction rate, and is a novel advanced oxidation device which has much attention in water treatment engineering in recent years.
The photocatalytic oxidation method has the characteristics of good chemical stability, mechanical stability, light corrosion resistance, low cost, no toxicity and the like, so that the photocatalytic oxidation method is widely applied to anti-pollution coatings, sterilization, solar sensitized cells, photocatalytic treatment of environmental pollutants and the like. However, in practice, when water is treated by a photocatalytic oxidation method, because ultraviolet light is needed for photocatalysis, the ultraviolet light can generate a large amount of energy consumption under long-term illumination; and in the whole photocatalytic reaction process, factors influencing the reaction rate are more, such as contact area, fluid speed and the like, and the optimal reaction condition of the photocatalytic reaction needs to be obtained through experiments by controlling the contrast of quantitative factors and variable factors.
Therefore, in order to solve the above problems, a taylor vortex type photocatalytic water treatment test device and a test method are needed, which can store solar energy to provide electric energy for an ultraviolet lamp, and are convenient for testing the influence of variable factors on the photocatalytic reaction rate, so as to optimize the test method for obtaining the optimal reaction condition.
Disclosure of Invention
In view of the above, the present invention aims to overcome the defects in the prior art, and provide a taylor vortex type photocatalytic water treatment test apparatus and a test method, which can store solar energy to provide electric energy for an ultraviolet lamp, and facilitate testing of the influence of variable factors on the photocatalytic reaction rate, so as to optimize the test method for obtaining the optimal reaction condition.
The Taylor vortex type photocatalytic water treatment test device comprises an outer cylinder and an inner cylinder which are concentrically arranged and can relatively rotate, wherein the outer cylinder is sleeved outside the inner cylinder, the inner cylinder can be wholly or partially arranged inside the outer cylinder, the inner cylinder is driven by a motor to rotate, an ultraviolet lamp is arranged in the inner cylinder, the inner cylinder has light transmittance, a photocatalytic reaction channel is arranged between the outer cylinder and the inner cylinder, a catalyst is arranged in the photocatalytic reaction channel, the catalyst used by the device is suspended titanium dioxide powder, the outer cylinder is provided with a water inlet and a water outlet, and the water inlet is introduced into a water body to be purified. During the test, the outer cylinder is fixed, the motor drives the inner cylinder to rotate, a Taylor vortex is formed between the two cylinders, the central ultraviolet lamp is used as a light source for catalytic reaction, the vortex drives the water body to be purified to be in full contact reaction with the photocatalytic material, and the reaction efficiency is improved by utilizing the dynamic instability of the water body and the centrifugal instability of the annular size between cylinders. And leading out the purified water body from the water outlet, filtering out the catalytic material suspended in the water, and detecting the purification index. Transparent material is used to the inner tube, and the urceolus improves the ultraviolet ray utilization ratio with reflection of light material, settles the purple light lamp in the inner tube as catalytic reaction's light source, is equipped with water inlet and delivery port on the urceolus and through the external photovoltaic board of wire mouth, and purple light lamp and engine are connected to the photovoltaic board, realize light energy to electric energy conversion. A plurality of reactors can be selected to be operated in series according to the actual purification efficiency.
Furthermore, the photocatalytic reaction channel is positioned between the water inlet and the water outlet, so that the catalytic reaction distance of the water body with purification in the photocatalytic reaction channel is ensured to be long enough, and the photocatalytic reaction efficiency is improved.
Furthermore, the motor and the ultraviolet lamp are electrically connected to the photovoltaic panel through the wire port, and the photovoltaic panel is used for absorbing solar energy and converting the solar energy into electric energy for storage, so that the energy is saved and the environment is protected.
Further, the inner tube adopts transparent material to make, and transparent material can guarantee the penetrability of the purple light that the purple light lamp sent in the inner tube to the at utmost, guarantees that all light sources can both shine on the catalyst.
Further, the inner cylinder rotates relative to the outer cylinder under the drive of the motor, so that water in the photocatalytic reaction channel generates Taylor vortex.
A test method adopting the Taylor vortex type photocatalytic water treatment test device comprises the following test steps:
a. sampling, namely measuring the transparency L of the water body, the dissolved oxygen Q, the oxidation-reduction potential value Eh, the ammonia nitrogen content A of the water body, the chemical oxygen demand COD and the biochemical oxygen demand BOD5 of an initial sample of the extracted water, and recording initial data;
b. preparing a catalyst: firstly hydrolyzing titanium chloride or alkoxide to generate titanium hydroxide (or hydroxyl titanium oxide), then calcining to obtain TiO2, taking titanium tetrachloride as a raw material, and reacting:
TiCl4+4H2O→Ti(OH)4+4HCl，
Ti(OH)4→TiO2+2H2O，
or alkoxide is used as a raw material, and the reaction is
Ti(OR)4+4H2O→Ti(OH)4+4ROH，
Ti(OH)4→TiO2+2H2O; the prepared TiO2 is the catalyst;
c. quantitative determination for variable test studies:
c1. setting the rotation speed of the inner cylinder as a variable to ensure that the conditions of the rest photocatalytic reaction are unchanged, and sequentially recording the water transparency L after the photocatalytic reaction according to different inner cylinder rotation speed test batches1、L2、L3H. dissolved oxygen Q1、Q2、Q3A value of oxidation-reduction potential Eh1、Eh2、Eh3Water ammonia nitrogen content A1、A2、A3Chemical oxygen demand COD1、COD2、COD3DEG. biochemical oxygen demand BOD51、BOD52、BOD53Recording data and comparing and analyzing to find out the inner cylinder rotating speed which can lead the photocatalytic reaction efficiency to be the highest;
c2. setting the length of the inner cylinder in the outer cylinder as variable to ensure the condition of the rest photocatalytic reaction to be unchanged, and recording the water transparency L after the photocatalytic reaction in turn according to different built-in length test batches of the inner cylinder1、L2、L3H. dissolved oxygen Q1、Q2、Q3A value of oxidation-reduction potential Eh1、Eh2、Eh3Water ammonia nitrogen content A1、A2、A3Chemical oxygen demand COD1、COD2、COD3DEG. biochemical oxygen demand BOD51、BOD52、BOD53Recording data, comparing and analyzing to find out the optimal built-in length of the inner cylinder and provide data support for subsequent tests;
c3. setting the diameter of the inner cylinder as a variable to ensure that the rest photocatalytic reaction conditions are unchanged, and sequentially recording the water transparency L after photocatalytic reaction according to different diameter test batches of the inner cylinder1、L2、L3H. dissolved oxygen Q1、Q2、Q3A value of oxidation-reduction potential Eh1、Eh2、Eh3Water bodyContent of Ammonia Nitrogen A1、A2、A3Chemical oxygen demand COD1、COD2、COD3DEG. biochemical oxygen demand BOD51、BOD52、BOD53Recording data, comparing and analyzing to find out the optimal diameter of the inner cylinder, and providing data support for subsequent tests;
c4. setting the retention time of the water to be purified in the photocatalytic reaction channel as variable to ensure the remaining photocatalytic reaction conditions to be unchanged, and recording the water transparency L after the photocatalytic reaction in sequence according to the test batches with different retention times of the water to be purified in the photocatalytic reaction channel1、L2、L3H. dissolved oxygen Q1、Q2、Q3A value of oxidation-reduction potential Eh1、Eh2、Eh3Water ammonia nitrogen content A1、A2、A3Chemical oxygen demand COD1、COD2、COD3DEG. biochemical oxygen demand BOD51、BOD52、BOD53Recording data and comparing and analyzing to find out the optimal residence time of the purified water in the photocatalytic reaction channel so as to provide data support for subsequent experiments.
Further, the water transparency L, the dissolved oxygen Q, the oxidation-reduction potential value Eh, the ammonia nitrogen content A, the chemical oxygen demand COD and the biochemical oxygen demand BOD5 in the step c are all measured after the catalyst in the water is filtered out from the water which is led out from the water outlet.
The invention has the beneficial effects that: the invention discloses a Taylor vortex type photocatalytic water treatment test device and a test method, which are provided with a photovoltaic panel, can convert solar energy into electric energy for storage, fully utilize energy, save photocatalytic reaction time, simultaneously save energy and protect environment, improve the interface area of water and catalyst contact in the photocatalytic reaction in the operation process of the whole Taylor vortex type photocatalytic water treatment test device, improve the reaction efficiency, can very clearly determine the influence condition of each factor in the photocatalytic reaction on the photocatalytic reaction by controlling a variable method, can find out the optimal test condition in multiple tests, improve the photocatalytic reaction efficiency, have simple structure and low cost, are convenient to apply, and have simple, direct, rapid and accurate test method.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
fig. 3 is a schematic cross-sectional view of fig. 1.
Detailed Description
Fig. 1 is a schematic structural diagram of the present invention, fig. 2 is a sectional view of fig. 1, and fig. 3 is a schematic cross-sectional diagram of fig. 1, as shown in the drawings, the taylor vortex photocatalytic water treatment test apparatus and test method in this embodiment includes an outer cylinder 1 and an inner cylinder 2 which are concentrically arranged and can relatively rotate, the outer cylinder 1 is sleeved outside the inner cylinder 2, the inner cylinder 2 can be wholly or partially arranged inside the outer cylinder 1, the inner cylinder 2 is driven to rotate by a motor, an ultraviolet lamp 3 is arranged in the inner cylinder 2, the inner cylinder 2 has light transmittance, a photocatalytic reaction channel is arranged between the outer cylinder 1 and the inner cylinder 2, a catalyst 6 is arranged in the photocatalytic reaction channel, the catalyst 6 used by the apparatus is suspended titanium dioxide powder, a water inlet 4 and a water outlet 5 are arranged on the outer cylinder 1, and. During the test, the outer cylinder 1 is fixed, the motor drives the inner cylinder 2 to rotate, a Taylor vortex is formed between the two cylinders, the central ultraviolet lamp 3 is used as a light source for catalytic reaction, the vortex drives the water to be purified to be in full contact reaction with a photocatalytic material, and the reaction efficiency is improved by utilizing the dynamic instability of the water and the centrifugal instability of the annular size between cylinders. And the water outlet 5 leads out the purified water body, filters out the catalytic material suspended in the water and carries out purification index detection. Inner tube 2 is with transparent material, and urceolus 1 improves the ultraviolet ray utilization ratio with reflection of light material, settles purple light lamp 3 in the inner tube 2 and regard as catalytic reaction's light source, is equipped with water inlet 4 and delivery port 5 on the urceolus 1 and through the external photovoltaic board 7 of electric wire mouth, and purple light lamp 3 and engine are connected to photovoltaic board 7, realize light energy to electric energy conversion. A plurality of reactors can be selected to be operated in series according to the actual purification efficiency.
In this embodiment, the photocatalytic reaction channel is located between the water inlet 4 and the water outlet 5, so that the catalytic reaction distance of the water body with purification in the photocatalytic reaction channel is long enough, and the photocatalytic reaction efficiency is improved.
In this embodiment, the motor and the ultraviolet lamp 3 are electrically connected to the photovoltaic panel 7 through the wire port, and the photovoltaic panel 7 is used for absorbing solar energy and converting the solar energy into electric energy for storage, so that the energy conservation and the environmental protection are realized.
In this embodiment, inner tube 2 adopts transparent material to make, and transparent material can guarantee the penetrability of the purple light that 2 interior purple light lamps 3 of inner tube sent by furthest, guarantees that all light sources can both shine on catalyst 6.
In this embodiment, the inner cylinder 2 is driven by a motor to rotate relative to the outer cylinder 1, so that the water in the photocatalytic reaction channel generates taylor vortex.
A test method adopting the Taylor vortex type photocatalytic water treatment test device comprises the following test steps:
a. sampling, namely measuring the transparency L of the water body, the dissolved oxygen Q, the oxidation-reduction potential value Eh, the ammonia nitrogen content A of the water body, the chemical oxygen demand COD and the biochemical oxygen demand BOD5 of an initial sample of the extracted water, and recording initial data;
b. preparation of catalyst 6: firstly hydrolyzing titanium chloride or alkoxide to generate titanium hydroxide (or hydroxyl titanium oxide), then calcining to obtain TiO2, taking titanium tetrachloride as a raw material, and reacting:
TiCl4+4H2O→Ti(OH)4+4HCl，
Ti(OH)4→TiO2+2H2O，
or alkoxide is used as a raw material, and the reaction is
Ti(OR)4+4H2O→Ti(OH)4+4ROH，
Ti(OH)4→TiO2+2H2O; the prepared TiO2 is the catalyst 6;
c. quantitative determination for variable test studies:
c1. the rotating speed of the inner cylinder 2 is set as a variable to ensure that the rest photocatalytic reaction conditions are unchanged, and water after photocatalytic reaction is recorded in sequence according to different rotating speed test batches of the inner cylinder 2Bulk transparency L1、L2、L3H. dissolved oxygen Q1、Q2、Q3A value of oxidation-reduction potential Eh1、Eh2、Eh3Water ammonia nitrogen content A1、A2、A3Chemical oxygen demand COD1、COD2、COD3DEG. biochemical oxygen demand BOD51、BOD52、BOD53Recording data and comparing and analyzing to find out the rotating speed of the inner cylinder 2 which can ensure that the photocatalytic reaction efficiency is highest;
c2. the length of the inner cylinder 2 placed in the outer cylinder 1 is set as a variable to ensure that the conditions of the rest photocatalytic reaction are unchanged, and the water transparency L after the photocatalytic reaction is recorded in sequence according to different built-in length test batches of the inner cylinder 21、L2、L3H. dissolved oxygen Q1、Q2、Q3A value of oxidation-reduction potential Eh1、Eh2、Eh3Water ammonia nitrogen content A1、A2、A3Chemical oxygen demand COD1、COD2、COD3DEG. biochemical oxygen demand BOD51、BOD52、BOD53Recording data, comparing and analyzing to find out the optimal built-in length of the inner cylinder 2 and provide data support for subsequent tests;
c3. the diameter of the inner cylinder 2 is set as a variable to ensure that the conditions of the rest photocatalytic reaction are unchanged, and the water transparency L after the photocatalytic reaction is recorded in sequence according to the test batches with different diameters of the inner cylinder 21、L2、L3H. dissolved oxygen Q1、Q2、Q3A value of oxidation-reduction potential Eh1、Eh2、Eh3Water ammonia nitrogen content A1、A2、A3Chemical oxygen demand COD1、COD2、COD3DEG. biochemical oxygen demand BOD51、BOD52、BOD53Recording data and comparing and analyzing to find the optimal diameter of the inner cylinder 2 so as to provide data support for subsequent tests;
c4. the water to be purified is photo-catalyzedSetting the residence time in the reaction channel as variable to ensure the rest photocatalytic reaction condition to be unchanged, and recording the water transparency L after photocatalytic reaction according to the test batches with different residence times of the water to be purified in the photocatalytic reaction channel1、L2、L3H. dissolved oxygen Q1、Q2、Q3A value of oxidation-reduction potential Eh1、Eh2、Eh3Water ammonia nitrogen content A1、A2、A3Chemical oxygen demand COD1、COD2、COD3DEG. biochemical oxygen demand BOD51、BOD52、BOD53Recording data and comparing and analyzing to find out the optimal residence time of the purified water in the photocatalytic reaction channel so as to provide data support for subsequent experiments.
In this embodiment, the water transparency L, the dissolved oxygen Q, the oxidation-reduction potential value Eh, the ammonia nitrogen content a of the water, the chemical oxygen demand COD, and the biochemical oxygen demand BOD5 in step c are measured after the catalyst 6 in the water is filtered out from the water led out from the water outlet 5.
The invention discloses a Taylor vortex type photocatalytic water treatment test device and a test method, which are provided with a photovoltaic panel, can convert solar energy into electric energy for storage, fully utilize energy, save photocatalytic reaction time, simultaneously save energy and protect environment, improve the interface area of water and catalyst contact in the photocatalytic reaction in the operation process of the whole Taylor vortex type photocatalytic water treatment test device, improve the reaction efficiency, can very clearly determine the influence condition of each factor in the photocatalytic reaction on the photocatalytic reaction by controlling a variable method, can find out the optimal test condition in multiple tests, improve the photocatalytic reaction efficiency, have simple structure and low cost, are convenient to apply, and have simple, direct, rapid and accurate test method.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. The utility model provides a taylor vortex formula photocatalysis water treatment test device which characterized in that: including setting up with one heart and just relative rotation's urceolus and inner tube, the urceolus cover is located outside the inner tube, the inner tube can be whole or the part is arranged in inside the urceolus, the inner tube is rotatory by motor drive, it has the light transmissivity to set up purple light lamp and inner tube in the inner tube, be provided with the catalyst in it for the photocatalytic reaction passageway between urceolus and the inner tube, water inlet and delivery port have been seted up on the urceolus.
2. The taylor vortex type photocatalytic water treatment test device as set forth in claim 1, wherein: the photocatalytic reaction channel is positioned between the water inlet and the water outlet.
3. The taylor vortex type photocatalytic water treatment test device as set forth in claim 2, wherein: the motor and the ultraviolet lamp are electrically connected to the photovoltaic panel through the wire ports, and the photovoltaic panel is used for absorbing solar energy and converting the solar energy into electric energy for storage.
4. The taylor vortex type photocatalytic water treatment test device as set forth in claim 1, wherein: the inner cylinder is made of transparent materials.
5. The Taylor vortex type photocatalytic water treatment test device as set forth in claim 4, wherein: the inner cylinder rotates relative to the outer cylinder under the drive of the motor to enable water in the photocatalytic reaction channel to generate Taylor vortex.
6. A test method using the Taylor vortex type photocatalytic water treatment test device of any one of claims 1 to 5, characterized in that: the method comprises the following testing steps:
a. sampling, namely measuring the transparency L of the water body, the dissolved oxygen Q, the oxidation-reduction potential value Eh, the ammonia nitrogen content A, the chemical oxygen demand COD and the biochemical oxygen demand BOD5 of the initial sample of the extracted water, and recording initial data;
b. preparing a catalyst: firstly hydrolyzing titanium chloride or alkoxide to generate titanium hydroxide (or hydroxyl titanium oxide), then calcining to obtain TiO2, taking titanium tetrachloride as a raw material, and reacting:
TiCl4+4H2O→Ti(OH)4+4HCl，
Ti(OH)4→TiO2+2H2O，
or alkoxide is used as a raw material, and the reaction is
Ti(OR)4+4H2O→Ti(OH)4+4ROH，
Ti(OH)4→TiO2+2H2O; the prepared TiO2 is the catalyst;
c. quantitative determination for variable test studies:
c1. setting the rotation speed of the inner cylinder as a variable to ensure that the conditions of the rest photocatalytic reaction are unchanged, and sequentially recording the water transparency L after the photocatalytic reaction according to different inner cylinder rotation speed test batches1、L2、L3… dissolved oxygen Q1、Q2、Q3…, oxidation-reduction potential value Eh1、Eh2、Eh3…, ammonia nitrogen content A of water body1、A2、A3… chemical oxygen demand COD1、COD2、COD3… Biochemical oxygen demand BOD51、BOD52、BOD53…, recording data, comparing and analyzing to find out the inner cylinder rotation speed which can make the photocatalytic reaction efficiency the highest;
c2. setting the length of the inner cylinder in the outer cylinder as variable to ensure the condition of the rest photocatalytic reaction to be unchanged, and recording the water transparency L after the photocatalytic reaction in turn according to different built-in length test batches of the inner cylinder1、L2、L3… dissolved oxygen Q1、Q2、Q3…, oxidation-reduction potential value Eh1、Eh2、Eh3…, ammonia nitrogen content A of water body1、A2、A3… chemical oxygen demand COD1、COD2、COD3… Biochemical oxygen demand BOD51、BOD52、BOD53…, recording data, comparing and analyzing to find the best inner length of the inner cylinder, and providing data support for the subsequent test;
c3. setting the diameter of the inner cylinder as a variable to ensure that the rest photocatalytic reaction conditions are unchanged, and sequentially recording the water transparency L after photocatalytic reaction according to different diameter test batches of the inner cylinder1、L2、L3… dissolved oxygen Q1、Q2、Q3…, oxidation-reduction potential value Eh1、Eh2、Eh3…, ammonia nitrogen content A of water body1、A2、A3… chemical oxygen demand COD1、COD2、COD3… Biochemical oxygen demand BOD51、BOD52、BOD53…, recording data, comparing and analyzing to find the optimum diameter of the inner cylinder, and providing data support for subsequent tests;
c4. setting the retention time of the water to be purified in the photocatalytic reaction channel as variable to ensure the remaining photocatalytic reaction conditions to be unchanged, and recording the water transparency L after the photocatalytic reaction in sequence according to the test batches with different retention times of the water to be purified in the photocatalytic reaction channel1、L2、L3… dissolved oxygen Q1、Q2、Q3…, oxidation-reduction potential value Eh1、Eh2、Eh3…, ammonia nitrogen content A of water body1、A2、A3… chemical oxygen demand COD1、COD2、COD3… Biochemical oxygen demand BOD51、BOD52、BOD53…, recording data and comparing and analyzing to find out the best staying time of the purified water in the photocatalytic reaction channel, and providing data support for the subsequent experiment.
7. The testing method of the Taylor vortex type photocatalytic water treatment testing device as claimed in claim 6, wherein: and c, measuring the water transparency L, the dissolved oxygen Q, the oxidation-reduction potential value Eh, the ammonia nitrogen content A of the water, the chemical oxygen demand COD and the biochemical oxygen demand BOD5 in the step c after filtering the catalyst in the water from the water led out from the water outlet.
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