CN210005427U - total phosphorus detection system - Google Patents
total phosphorus detection system Download PDFInfo
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- CN210005427U CN210005427U CN201920607730.6U CN201920607730U CN210005427U CN 210005427 U CN210005427 U CN 210005427U CN 201920607730 U CN201920607730 U CN 201920607730U CN 210005427 U CN210005427 U CN 210005427U
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Abstract
The utility model provides an total phosphorus detecting system includes at least that the pretreatment module for reduce the particulate matter in the fluid that awaits measuring, the photocatalysis digestion module, with the pretreatment module intercommunication is cleared up based on the photocatalytic reaction, is arranged in turning into inorganic phosphorus with the organic phosphorus in the fluid that awaits measuring, microfluid detection module, with the photocatalysis digestion module intercommunication includes the microfluid mixed subassembly and the microfluid detection subassembly of intercommunication in proper order, microfluid mixed subassembly is used for mixing the colour development with the fluid that awaits measuring and detection agent, microfluid detection subassembly is used for detecting the fluid's that awaits measuring absorbance after the colour development.
Description
Technical Field
The utility model relates to a fluid processing field especially relates to kinds based on total phosphorus detecting system.
Background
The total phosphorus is a general name of elements such as phosphorus, pyrophosphate, orthophosphate, condensed phosphate, metaphosphate, phosphate combined with organic groups and the like, the main pollution sources of the total phosphorus are domestic sewage, chemical fertilizers, organic phosphorus pesticides, phosphate builders used by modern detergents and the like, moreover, the phosphorus is key elements necessary for the growth of algae in water, but the excessive phosphorus content can cause the water body to generate dirt and deep odor, so that the water body is eutrophicated, even generates red tide, and in the development process of phosphorus chemical industry, the byproducts thereof also bring a large amount of pollution, such as dust, waste water and solid waste, which can cause great damage to the environment when entering the environment, such as waste gas and dust, mainly contain carbon oxide, carbon dioxide, hydrogen fluoride, hydrogen phosphide, hydrogen sulfide and the like, the waste water contains toxic and harmful substances such as phosphorus, fluorine, sulfur, chlorine, arsenic, alkali, uranium and the like, the solid waste contains tailings, waste rock, phosphorus slag, iron slag, calcium, iron and the like discharged from the production of yellow phosphorus, the slag.
Before the water body polluted by phosphorus is treated, the content of total phosphorus in the water body needs to be determined, so that the best treatment scheme can be worked out.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide total phosphorus detection systems.
To achieve the above and other related objects, the present invention provides total phosphorus detection systems, the total phosphorus detection system at least comprising:
the pretreatment module is used for reducing particulate matters in the fluid to be detected;
the photocatalytic digestion module is communicated with the pretreatment module, is used for carrying out digestion based on photocatalytic reaction and is used for converting organic phosphorus in the fluid to be detected into inorganic phosphorus;
the microfluid detection module is communicated with the photocatalytic digestion module and sequentially comprises a microfluid mixing component and a microfluid detection component which are communicated, wherein the microfluid mixing component is used for mixing and developing the fluid to be detected and the detection medicament, and the microfluid detection component is used for detecting the absorbance of the fluid to be detected after the development.
As mentioned above, the utility model discloses a total phosphorus detecting system has following beneficial effect:
the utility model discloses a total phosphorus detecting system volume is very little, and reaction rate is fast, and is effectual. The device has the advantages of no blockage, high accuracy, repeated use, small volume, low cost, high automation degree, resource waste prevention, cost saving, environmental protection and no need of high-temperature and high-pressure equipment.
Drawings
Fig. 1 is a schematic view of the total phosphorus detection system according to the present invention.
FIG. 1.1 is a schematic diagram showing the plane structure of the total phosphorus detection system (with electrolyte mixing module) of the present invention
Fig. 2 is a schematic diagram showing a planar structure of a pretreatment module of the total phosphorus detection system of the present invention.
Fig. 3 is a schematic view showing a three-dimensional structure of a pretreatment module of the total phosphorus detection system of the present invention.
Fig. 4 shows an explosion diagram of the photocatalytic digestion module of the total phosphorus detection system of the present invention.
Fig. 5 is a schematic diagram of the cathode and anode-free reaction cell of the photocatalytic digestion module of the total phosphorus detection system of the present invention.
Fig. 6 is a schematic diagram of the reaction cell containing the cathode and the anode of the photocatalytic digestion module of the total phosphorus detection system of the present invention.
Fig. 7 shows that the photocatalytic digestion module of the total phosphorus detection system of the present invention is assembled to complete the figure.
Fig. 8 is a schematic view of the structure of the microfluidic detection module of the total phosphorus detection system of the present invention.
Fig. 9 is a schematic top view of the microfluidic detection module of the total phosphorus detection system of the present invention.
Fig. 10 shows a cross-sectional view (B-B direction) of a top view of a microfluidic detection module of the total phosphorus detection system of the present invention.
Fig. 11 shows a perspective view of an electrolyte mixing module of the total phosphorus detection system of the present invention.
Fig. 12 is an exploded top perspective view of the electrolyte mixing module of the total phosphorus detection system of the present invention.
Fig. 13 is an exploded bottom view of the electrolyte mixing module of the total phosphorus detection system of the present invention.
Fig. 14 shows a perspective view of a top view of an electrolyte mixing module of the total phosphorus detection system of the present invention.
Fig. 15 shows a cross-sectional view (section a-a) of the electrolyte mixing module of the total phosphorus detection system of the present invention.
Fig. 16 is a turbidity graph of effluent from the pre-treatment module according to an example of the present invention, wherein blue indicates effluent from the fourth outlet (inner turbidity) and green indicates effluent from the third outlet (outer turbidity).
Fig. 17 is a graph showing the particle size of the effluent from the fourth outlet of the pretreatment module according to an embodiment of the present invention.
Fig. 18 shows a particle size diagram of the effluent from the third outlet of the pretreatment module according to an embodiment of the present invention.
Fig. 19 shows the effect of the 0.45 μm filter membrane filtration of the pretreatment module in the example of the present invention.
Fig. 20 shows the effect of heating on the photocatalytic reaction, where red is the effect of heating and blue is the effect of no heating.
Description of the element reference numerals
1 preprocessing module
1.1 pretreatment Inlet
1.2 arcuate separation channel
1.2.1 outlet
1.2.2 second outlet
1.3 Power Module
1.3.1 th drive Pump
1.3.2 second drive Pump
1.4 second arcuate separation channel
1.4.1 second inlet
1.4.2 third outlet
1.4.3 fourth outlet
1.5 Primary Filter Assembly
1.6 water purifying tank
1.7 waste water tank
1.8 water pump
2 photocatalysis digestion module
2.1 photocatalytic digestion inlet
2.2 photocatalytic digestion reaction tank
2.2.1 anodes
2.2.2 cathodes
2.3 ultraviolet lamp
2.4 photocatalytic digestion outlet
2.5 light-transmitting glass
2.6 ultraviolet lamp cover
2.7 cathode channel
2.8 electrode holes
3 microfluidic detection module
3.1 microfluidic mixing Assembly
3.1.1 microfluid injection port
3.1.2 microfluidic drug ports
3.1.3 microfluidic mixing Chamber
3.1.3.1 air vents
3.1.4 vibrator
3.2 microfluidic detection Assembly
3.2.1 microfluidic detection Chamber
3.2.2 optical element
3.3 flow control Assembly
3.4 microfluidic Outlet
4 electrolyte mixing module
4.1 mixing body
4.2 electrolyte mixing liquid inlet
4.3 Mixed liquid outlet for electrolyte
4.4 mixing Unit
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
Please refer to fig. 1 to 20, it should be understood that the structures, ratios, sizes, etc. shown in the drawings attached to the present specification are only used for matching with the disclosure of the present specification, so as to be known and read by those skilled in the art, and are not used for limiting the practical limitations of the present invention, so they have no technical essential meaning, and any modification of the structures, changes of the ratio relationships, or adjustments of the sizes should still fall within the scope of the technical contents disclosed in the present invention without affecting the function and the achievable purpose of the present invention.
As shown in fig. 1, for the total phosphorus detection system provided by the present invention, the total phosphorus detection system at least includes:
the pretreatment module 1 is used for reducing particulate matters in the fluid to be detected;
the photocatalytic digestion module 2 is communicated with the pretreatment module, is used for carrying out digestion based on photocatalytic reaction and is used for converting organic phosphorus in the fluid to be detected into inorganic phosphorus;
the microfluid detection module 3 is communicated with the photocatalytic digestion module and sequentially comprises a microfluid mixing component 3.1 and a microfluid detection component 3.2 which are communicated with each other, wherein the microfluid mixing component is used for mixing and developing the fluid to be detected and the detection medicament, and the microfluid detection component is used for detecting the absorbance of the fluid to be detected after the development.
Further , as shown in fig. 2 and 3, the pre-processing module 1 includes:
a pre-treatment inlet 1.1 for receiving a fluid to be measured;
an th arc-shaped separation channel 1.2, which comprises a th liquid inlet and a 0 th liquid outlet, wherein the th liquid inlet is arranged at the end of the th arc-shaped separation channel 1.2 and is communicated with the pretreatment inlet 1.1, the th liquid outlet is arranged at the other end of the th arc-shaped separation channel 1.2 and comprises an th outlet 1.2.1 and a second outlet 1.2.2, and the th outlet 1.2.1 is far from the arc center of the arc center than the second outlet 1.2.2;
a power assembly 1.3 comprising an th drive pump 1.3.1 and a second drive pump 1.3.2, the th drive pump 1.3.1 and second drive pump 1.3.2 driving fluid flow from the th outlet 1.2.1 and the second outlet 1.2.2, respectively.
The maximum particle size of the particulate matter contained in the th outlet effluent is greater than the maximum particle size of the particulate matter contained in the second outlet effluent.
, the power assembly 1.3 further includes a controller connected to the th drive pump 1.3.1 and the second drive pump 1.3.2, respectively.
The controller can be a single chip microcomputer which can be 8-bit minimum systems, different brands and models or controllers or processors with higher bits can be selected for the controller, the controller can be used for installing relevant control programs, and after the relevant control programs are installed, the controller can control the pump speeds of the th driving pump and the second driving pump according to requirements.
, the th actuation pump 1.3.1 has a different pumping speed than the second actuation pump 1.3.2.
In embodiments, the th actuation pump 1.3.1 has a pump speed greater than the second actuation pump 1.3.2.
In , the speed of the drive pump 1.3.1 at is 70-150mL/min and/or the speed of the second drive pump 1.3.2 is 60-130 mL/min.
In , the pretreatment module further includes a second curved separation channel 1.4 including a second inlet 1.4.1 and a second outlet, the second inlet 1.4.1 is disposed at end of the second curved separation channel 1.4 and is communicated with the second outlet 1.2.2, the second outlet is disposed at another end of the second curved separation channel 1.4 and includes a third outlet 1.4.2 and a fourth outlet 1.4.3, wherein the third outlet 1.4.2 is farther from the center of the arc than the fourth outlet 1.4.3.
The second arcuate separation channel is configured to further separate the particulate matter from the fluid.
In , the pre-treatment module further includes a primary filter assembly 1.5 disposed between the pre-treatment inlet 1.1 and the th arcuate separation channel 1.2 for filtering large particles in the fluid to be tested.
In embodiments, the primary filter assembly 1.5 includes a filter having a screen with a pore size of no greater than 120 mesh for preventing clogging by the entry of excessively large particles into the hollow cylindrical separation channel.
In , the fluid system further includes a fresh water tank 1.6 for storing the fluid discharged from the fourth outlet.
In embodiments, the fluid system further comprises a waste water tank 1.7 for collecting fluid discharged from the th outlet and the third outlet.
In embodiments, the arc-shaped separation channel has a central angle of 179-181, optionally 179, 180, 181, to ensure adequate path for the particles to diffuse toward the outer turn without taking up excessive volume.
In embodiments, the second arcuate separation channel has a central angle of 179-181, optionally 179, 180, 181, ensuring that the second arcuate separator has sufficient travel so that liquid purified by the arcuate separator can continue to be separated again by the second arcuate separation channel.
In kinds of embodiments, arc separation channel 1.2's cavity is curved cuboid, arc separation channel 3's cavity height is 0.4-2mm, wide 5-15mm the cavity of second arc separation channel 1.4 is curved cuboid, the biggest internal diameter of second arc separation channel 9 is high 0.4-2mm, wide 5-15 mm.
In the embodiment, the pre-treatment inlet 1.1 is driven by a suction pump 1.8, as shown in fig. 2.
, the photocatalytic digestion module includes:
the photocatalytic digestion inlet 2.1 is communicated with the pretreatment module 1 and is used for receiving the fluid to be detected from the pretreatment module 1;
the photocatalytic digestion reaction pool 2.2 is communicated with the photocatalytic digestion inlet 2.1 and is used for carrying out photocatalytic reaction; the photocatalytic digestion reaction pool is internally provided with an anode 2.2.1 and a cathode 2.2.2, the anode is paved at the bottom of the photocatalytic digestion reaction pool, and the cathode 2.2.2 is arranged on the side wall of the photocatalytic digestion reaction pool and is not in direct contact with the anode 2.2.1;
an ultraviolet lamp 2.3 for providing a light source for the photocatalytic digestion reaction tank 2.2;
and the photocatalytic digestion outlet 2.4 is communicated with the photocatalytic digestion reaction pool 2.2 and is used for discharging the fluid to be tested after reaction.
And the photocatalytic digestion inlet 2.1 is communicated with a purified water tank 1.6 of the pretreatment module.
In embodiments, the anode 2.2.1 is in the form of a sheet, optionally a rectangular parallelepiped.
As shown in figure 5, the side wall of the photocatalytic digestion reaction pool is provided with a cathode slot 2.7 for fixing a cathode.
And fixed distance is arranged between the cathode slot and the bottom of the photocatalytic digestion reaction pool to prevent the cathode from directly contacting the anode.
In embodiments, the cathode 2.2.2 surrounds the sidewall without interruption, and preferably, the cathode 2.2.2 surrounds at least of the perimeter of the sidewall.
In , the inner cavity of the photocatalytic digestion reaction pool is a straight prism.
In embodiments, as shown in fig. 5 and fig. 6, the side wall of the photocatalytic digestion reaction pool is provided with an electrode hole 2.8 for leading the cathode and the anode out of the photocatalytic digestion reaction pool respectively for connecting with a power supply, voltages are applied between the anode and the cathode so as to prevent the recombination of electron and hole pairs, thereby continuously generating-OH free radicals and increasing the efficiency of photoelectrocatalysis.
In embodiments, the supply voltage is between 0.5-1V.
In embodiments, the volume of the photocatalytic digestion reaction pool 2.2 is 25-1500 microliter.
The reaction tank 2 is a reaction tank with fixed length.
In embodiments, the maximum length of the inner cavity of the photocatalytic digestion reaction pool is 10mm-50 mm.
In embodiments, the maximum width of the inner cavity of the photocatalytic digestion reaction pool is 5mm-10 mm.
In embodiments, the maximum height of the inner cavity of the photocatalytic digestion reaction pool is 0.5mm-3 mm.
In embodiments, the anode 2.2.1 is a titanium dioxide electrode.
In embodiments, the cathode 2.2.2 is a titanium electrode.
In the embodiments, as shown in fig. 7, an ultraviolet lamp cover 2.6 is provided above the ultraviolet lamp 2.3.
In embodiments, the photocatalytic digestion module further comprises a photocatalytic digestion heating assembly for heating the photocatalytic digestion reaction cell.
, the heating component includes a heating plate disposed in the reaction tank.
In embodiments, the heating assembly controls the temperature of the reaction cell within the range of 60 + -15 deg.C to improve the reaction efficiency.
, arranging a light-transmitting opening at the side of the photocatalytic digestion reaction tank , arranging the ultraviolet lamp above the light-transmitting opening, arranging light-transmitting glass 2.5 at the light-transmitting opening, ensuring that the ultraviolet light can be absorbed, and simultaneously preventing the liquid in the reaction tank from polluting the ultraviolet lamp.
In embodiments, the length of the UV lamp 2.3 is greater than times the length of the light transmissive opening to ensure that the UV lamp has a length of and that the entire face of the anode is illuminated.
In embodiments, the width of the ultraviolet lamp 2.3 does not exceed the width of the photocatalytic digestion reaction pool, the volume of the whole device is reduced, and the waste of resources is reduced.
In embodiments, the ultraviolet lamp 2.3 is attached to the transparent glass 2.5, so that the ultraviolet light is directly irradiated into the photocatalytic digestion reaction tank, and the optical path is reduced.
The photocatalytic digestion inlet 2.1 and the photocatalytic digestion outlet 2.4 are both arranged at the bottom of the photocatalytic digestion reaction tank. The water body can be discharged without external force.
Further , as shown in fig. 8-10, the microfluidic mixing assembly 3.1 includes:
the microfluid sample inlet 3.1.1 is communicated with the photocatalytic digestion module and is used for receiving a fluid to be detected from the photocatalytic digestion module;
a microfluidic medicament port 3.1.2 for receiving a medicament capable of reacting with a fluid to be tested;
the microfluid mixing chamber 3.1.3 is respectively communicated with the microfluid sample inlet 3.1.1 and the microfluid medicament port 3.1.2 and is used for mixing fluid to be detected and medicament to enable a fluid flow sample to be detected to react with the medicament, as shown in fig. 10, a vent hole 3.1.3.1 is arranged on the side of the microfluid mixing chamber 3.1.3 .
The microfluid sample inlet 3.1.1 is communicated with the photocatalytic digestion outlet 2.4 of the photocatalytic digestion module.
As shown in fig. 10, the microfluidic detection assembly 3.2 comprises:
the microfluid detection cavity 3.2.1 is communicated with the microfluid mixing cavity 3.1.3 and is used for detecting a liquid flow sample to be detected after reaction;
an optical element 3.2.2 for providing a light source to the microfluidic detection chamber 3.2.1. And (5) detecting the absorbance.
The medicament opening can be provided in plurality. Such as 2.
When the medicament and the liquid flow sample to be detected are mixed, bubbles can be generated, and the air vent can enable the bubbles to escape into the atmosphere, so that the influence of the bubbles on subsequent detection is prevented. Meanwhile, the vent hole connected with the atmosphere is arranged, so that the resistance generated by the system can be avoided when the sample is injected into the microfluid mixing cavity, and if the vent hole is not arranged, the sample cannot enter the mixing cavity due to the air resistance in the cavity; in the process of emptying the liquid, the liquid can be quickly discharged due to the existence of the air holes, and if the air holes are not arranged, the liquid cannot be discharged due to the action of air pressure.
In embodiments, the microfluidic injection port 3.1.1 has a diameter of 0.5-2 mm.
In embodiments, the microfluidic medicament port 3.1.2 has a diameter of 0.5-2 mm.
In embodiments, the microfluidic mixing chamber 3.1.3 has a cross-sectional area of 10-20mm2。
The cross-sectional area of the mixing chamber refers to the cross section from the microfluid injection port to the microfluid mixing chamber in the direction a.
In embodiments, the microfluidic detection chamber 3.2.1 has a volume of 50-100mm3。
In embodiments, the vent 3.1.3.1 is located in the side wall and/or top end of the microfluidic mixing chamber 3.1.3.
In embodiments, the vent holes 3.1.3.1 can be provided in the side wall of the microfluidic mixing chamber 3.1.3, the height of the vent holes is 30% -90% of the height of the microfluidic mixing chamber 3.1.3, and the vent holes are at a higher position to prevent liquid from overflowing.
In embodiments, the vent holes 3.1.3.1 have a diameter of 1-5 mm.
In embodiments, the microfluidic mixing chamber is a hollow cylinder.
In embodiments, a catheter fixing component is further provided outside the microfluidic sample inlet 3.1.1 and the microfluidic drug port 3.1.2 for fixing a catheter feeding liquid to the sample inlet or the drug port, and in embodiments, the catheter fixing component is provided with spiral threads for fixing.
In embodiments, a vibrator 3.1.4 is provided under the microfluidic mixing chamber 3.1.3 for vibrating during mixing to generate a lot of micro turbulence in the liquid, so as to accelerate the mixing of the liquid, and simultaneously prevent the sediment generated in the reaction from scaling on the inner wall of the mixing chamber, prevent the system from being blocked, make the whole device reusable and greatly reduce the cost.
In embodiments, the vibrator 5 is selected from FLAT vibrators, which may be, for example, a Shenzhen Yadid technology, Inc. YDF1027L pin FLAT miniature vibrating motor, or Shenzhen Shenkun Penta electromechanical, Inc. KPD-FLAT-0827.
In embodiments, the vibrator has a frequency of 10000-.
Further , the microfluidic detection chamber 3.2.1 is light permeable.
In embodiments, the optical element 3.2.2 is located above the microfluidic detection chamber 3.2.1.
, the microfluid detecting device further comprises a microfluid outlet 3.4, which is communicated with the microfluid detecting cavity and used for discharging the detected liquid.
In , the microfluidic detection module further comprises a flow control assembly 3.3 for driving the sample of the liquid stream to be detected to flow in the microfluidic detection device and/or controlling the flow rate of the fluid to be detected.
In , the flow control assembly includes a drive pump and valve for controlling the flow of fluids to the microfluidic inlet, the microfluidic outlet, and the microfluidic medicament port, respectively, the valve is disposed at the microfluidic inlet, the microfluidic outlet, and the microfluidic medicament port, respectively.
The flow control assembly further comprises a peristaltic pump for injecting the liquid flow sample to be detected into the microfluidic detection cavity.
In embodiments, the actuation pump is a piezoelectric pump.
In embodiments, the valve is a shape memory alloy microvalve (SMA valve ) the opening and closing of the valve can be controlled by changing the temperature to control the deformation of the memory alloy in the valve body).
In embodiments, the microfluidic cartridge body is made of PMMA, and includes a microfluidic sample inlet, a microfluidic drug port, a microfluidic mixing chamber, and a microfluidic detection chamber, but does not include opto-electronic device components such as flow control components, vibrators, and optical elements.
In embodiments, the microfluidic detection device is formed in a body, the microfluidic cartridge body includes a microfluidic sample inlet, a microfluidic drug port, a microfluidic mixing chamber, and a microfluidic detection chamber, but does not include opto-electronic instrument components such as flow control components, vibrators, and optical elements.
In embodiments, as shown in fig. 1.1, the total phosphorus detection system further comprises an electrolyte mixing module 4, which is arranged between the pretreatment module 1 and the photocatalytic digestion module 2, and is used for adding and mixing the electrolyte for photocatalytic digestion.
As shown in fig. 11 to 13, the electrolyte mixing module includes: hollow mixed main part 4.1 on the length direction of mixed main part, be equipped with the mixed inlet of electrolyte 4.2 and the mixed liquid outlet of electrolyte 4.3, the mixed liquid outlet of electrolyte 4.3 with 2 intercommunications of photocatalysis digestion module the mixed inlet of electrolyte 4.2 to the mixed liquid outlet of electrolyte 4.3 between, the intercommunication has set gradually a plurality of mixing unit 4.4 in the blender main part, mixing unit 4.4 is hollow prism.
The electrolyte mixing liquid inlet 4.2 is communicated with a purified water tank 1.6 of the pretreatment module.
The electrolyte mixed liquid outlet is communicated with the photocatalytic digestion inlet of the photocatalytic digestion module.
Further , the prisms are straight prisms.
The electrolyte mixing liquid inlet is used for feeding liquid.
The electrolyte mixing liquid outlet is used for discharging mixed liquid.
The mixing unit is used for liquid mixing.
The electrolyte mixing liquid inlet and the electrolyte mixing liquid outlet are communicated through the mixing unit.
The mixing units are connected in series.
In embodiments, the mixing unit 4.4 is selected from any or more of a hollow quadrangular prism, a hexagonal prism, or an octagonal prism for enhancing turbulence of the fluid and accelerating radial mixing of the fluid.
Preferably any kinds of hollow regular quadrangular prism, regular hexagonal prism or regular octagonal prism.
In embodiments, the adjacent mixing units are communicated through the communication ports, and the communication ports are positioned on the same line , which is beneficial to reducing the loss of kinetic energy of liquid, ensuring the minimum water resistance and having lower requirements on the liquid inlet pump.
In the embodiments, adjacent communication ports are provided on opposing edges of the mixing unit, preferably, the communication ports have a cross-sectional area of S20.01-0.36mm2. The turbulent flow of the strong fluid is used, and the radial mixing of the fluid is accelerated.
As shown in fig. 15, the cross-sectional area S2 of the communication port is an area S2 of the communication port in a direction AA perpendicular to a plane in the longitudinal direction c of the mixer main body.
As shown in fig. 14, in the preferred embodiments, the bottom surface of the mixing unit is formed in an axisymmetric pattern, and the axis of symmetry is a line b connecting the intersection points of the edge of the mixing unit, on which the communication port is formed, and the bottom surface of the mixing unit.
In the embodiments, as shown in fig. 15, the height of the hollow cavity of each mixing unit 4.4 is equal, preferably, the height h of the hollow cavity is 0.1-0.6mm, which is beneficial to the rapid mixing of the liquid and the saving of the whole volume of the sample.
Preferably, the upper bottom surfaces of the mixing units are on the same plane, and the lower bottom surfaces of the mixing units are on the same plane.
In embodiments, the bottom area of the mixing unit 4.4 is 20-40mm2. Optionally, 31mm2. The liquid injected into the cavity can quickly form vortex, and the mixing effect is enhanced.
In the embodiments, the bottom areas of the mixing elements 4.4 are the same;
in embodiments, each mixing unit has a shape of 4.4 and a volume of , which is beneficial to maintaining consistency of water resistance of the whole flow channel, facilitating processing and prolonging the service life of the device.
In embodiments, the number of the electrolyte mixing inlet 4.2 is more than 2, and optionally, 2, 3 or 4 or more.
In embodiments, the number of electrolyte mixing outlets 4.3 is 1. the outlet for the mixing unit is only , which ensures the flow velocity of the fluid in the mixing chamber.
In embodiments, the number of mixing units 4.4 is 2-8, and in steps, 2-6, to facilitate mixing of different volumes of liquid.
In embodiments, the electrolyte mixing inlet 4.2 and the electrolyte mixing outlet 4.3 are on the sides of the hollow mixer body for reducing the overall length of the product.
The total phosphorus detection system also comprises a total controller, wherein the total controller can be a single chip microcomputer, the single chip microcomputer can be 8-bit minimum systems, the total controller can also be selected from controllers or processors with different brands and models or higher digits, the total controller can be used for installing related control programs, and after the related control programs are installed, the total controller can control the operation of a vibrator, a driving pump or a valve in each module according to the needs.
The use method of the total phosphorus detection system comprises the following steps:
(1) the pretreatment module is used for pretreating the fluid to be detected, so that particles in the fluid to be detected are reduced;
(2) carrying out photocatalytic digestion on the pretreated fluid to be detected by using a photocatalytic digestion module, and converting organic phosphorus in the fluid to be detected into inorganic phosphorus;
(3) and mixing the digested fluid to be detected with the detection medicament of the microfluid mixing component of the microfluid detection module for color development, detecting the absorbance of the developed fluid to be detected by the microfluid detection component of the microfluid detection module, and calculating the total phosphorus concentration in the fluid to be detected according to the absorbance.
In the step (1), the th driving pump in the pretreatment module is controlled to drive the fluid from the th outlet, and the second driving pump in the pretreatment module is controlled to drive the fluid flow from the second outlet.
The th actuation pump has a different pump speed than the second actuation pump.
The th actuation pump has a pump speed greater than the pump speed of the second actuation pump.
the pump speed of the driving pump is 70-150mL/min, and/or the pump speed of the second driving pump is 60-130 mL/min.
The step (2) comprises the following steps:
a. reaction: irradiating by an ultraviolet lamp, applying voltage, and carrying out photocatalytic reaction;
b. liquid drainage: discharging the reacted fluid;
c. electrode regeneration: after the reaction is finished, adding flushing liquid, applying reverse voltage, and then short-circuiting the electrode to regenerate the electrode;
d. the rinse liquid is drained.
The intensity of the illumination radiation of the ultraviolet lamp is 300-500 microwatts/square centimeter.
The power supply voltage is 0.5-1V. The generated electrons and holes can be effectively prevented from being compounded, the photocatalytic efficiency is improved, and the extra electrochemical reaction is prevented.
The liquid inlet is intermittent liquid inlet. Ensuring the fluid to fully react.
The hydraulic retention time of the photocatalytic reaction is 10-40 min. Ensuring the fluid to fully react.
In the step c, the time for applying the reverse voltage is 10-30s, and the electrode short-circuit time is 10-60 s.
In step c, the washing solution is selected from deionized water, sodium hydroxide aqueous solution or ethanol aqueous solution.
The mass concentration of the sodium hydroxide aqueous solution is 1-5%, and the mass concentration of the ethanol aqueous solution is 10-50%.
Step a, adding concentrated sulfuric acid and/or sodium sulfate aqueous solution into the fluid needing reaction. Enhance the conductivity and the oxidation property.
The concentrated sulfuric acid is a sulfuric acid aqueous solution with the mass fraction of more than or equal to 70%.
The concentrated sulfuric acid accounts for 2-10% of the volume of the feed liquid, and/or the sodium sulfate aqueous solution accounts for 5-10% of the volume of the feed liquid, and the concentration of the sodium sulfate is 10-200 mg/mL.
When the electrode regeneration is carried out, reverse voltage is applied to cause the double electric layers on the surfaces of the cathode and the anode to be destructured, phosphate ions remained in the double electric layers of the cathode and cations remained in the double electric layers of the anode can be rapidly desorbed from the double electric layers and enter a flushing liquid, and then the circuit control is carried out to short the cathode and the anode so as to enable the phosphate to be continuously desorbed and to be stable. At the moment, most of phosphate ions remained on the surface of the electrode enter the washing liquid, and then the washing liquid is emptied, so that the aim of regeneration is fulfilled.
The reverse voltage refers to a voltage opposite in direction to the power supply voltage in step a.
And heating the photocatalytic digestion reaction tank during reaction. The heating temperature is controlled within the interval of 60 +/-15 ℃. The reaction efficiency is improved. For example, in an experiment of digestion efficiency of phosphorus-containing organic matter within 20 minutes, the digestion efficiency can be improved by about 10 percentage points by heating, and the result is shown in fig. 20.
Electrolyte is added before photocatalytic digestion. The electrolyte may be sodium sulfate.
The step (3) comprises the following steps:
1) simultaneously opening a microfluid medicament port valve to quantitatively inject the medicament into the microfluid mixing cavity;
2) opening the vibrator to mix the medicament, and closing the vibrator and the microfluid medicament port valve after mixing uniformly;
3) quantitatively injecting the sample into the microfluid mixing chamber;
4) opening the vibrator to fully mix and react the medicament and the sample;
5) and injecting the reacted medicament into a microfluid detection cavity for detection.
The device introduces digested or undigested liquid containing phosphate radicals into the microfluidic detection device through pump valve control, firstly adds a medicament, performs mixing and color development reaction, and judges the concentration of the phosphate radicals in a sample through an absorbance test of the colored liquid. The addition of the agents was controlled by pump valves, respectively ammonium molybdate solution and ascorbic acid. The ammonium molybdate solution can be complexed with the phosphate travel in the sample. The main reaction equation is as follows:
PO4 3-+12MoO4 2-+27H+→H3PO4(MoO3)12+12H2O (1)
H3PMo(VI)12O40+Reductant→[H4PMo(VI)8Mo(V)4O40]3-(2)
the reaction is a famous molybdenum blue reaction, and comprises two steps, wherein in the step, as shown in a formula , phosphate ions react with molybdate ions under acidic conditions to generate heteropoly acid H3PO4(MoO3)12. in the second step, the heteropoly acid formed in the step is reduced into a blue product, and the absorbance of the blue product can generate a linear relation in a range with the concentration of phosphate in a sample, so that the concentration of phosphate can be obtained through absorbance measurement.
The step (3) may include the steps of:
1) simultaneously, microfluidic drug port valve is opened and then a metered amount of drug (molybdate solution and ascorbic acid) is injected into the microfluidic mixing chamber by a piezo-electric pump.
2) The vibrating motor at the bottom of the microfluid mixing chamber is turned on to mix the medicament for 10-30s, and then the vibrating motor is turned off.
3) Valve of the microfluidic medicament port is closed.
4) The sample pump (solenoid pump) was turned on to inject a fixed amount of sample into the microfluidic mixing chamber, and then turned off.
5) The vibrating motor is turned on again and mixed for 10-20 s.
6) And waiting for ten minutes to allow the reagent and the sample to generate molybdenum blue color reaction.
7) The mixed solution is pumped into the vibrator detection chamber by a peristaltic pump downstream of the vibrator detection chamber.
8) And turning on a light source and a detector for detection, and collecting a current signal.
9) Empty of liquid, the next samples could be tested.
Examples of the invention
1.1 Total phosphorus detection System, the system comprising a pre-processing module, the pre-processing module comprising:
an inlet for receiving a fluid;
the primary filtering component is used for filtering large particles in fluid and comprises a filter, and the pore size of a filter screen of the filter is 120 meshes;
an th arc-shaped separation channel, which comprises a th liquid inlet and a 0 th liquid outlet, wherein the th liquid inlet is arranged at the end of the th arc-shaped separation channel and is communicated with the inlet, the th liquid outlet is arranged at the other end of the th arc-shaped separation channel and comprises an th outlet and a second outlet, and the th outlet is farther away from the arc center of the circle than the second outlet;
a power assembly includes a controller, a first driven pump and a second driven pump, the first driven pump and the second driven pump respectively drive fluid flow from the outlet and fluid flow from the second outlet, a water flow rate in the passageway is ensured, a controller respectively controls pump speeds of the first driven pump and the second driven pump, the driven pump has a pump speed of 100mL/min, and the second driven pump has a pump speed of 85 mL/min.
The second arc-shaped separating channel comprises a second liquid inlet and a second liquid outlet, the second liquid inlet is formed in the end of the second arc-shaped separating channel and communicated with the second outlet, the second liquid outlet is formed in the other end of the second arc-shaped separating channel and comprises a third outlet and a fourth outlet, and the third outlet is far away from the arc circle center compared with the fourth outlet.
The central angle of the th arc-shaped separation channel is 180 degrees.
The central angle of the second arc-shaped separation channel is 180 degrees.
arc fractionating passage's cavity height 1mm, wide 15mm, second arc fractionating passage's cavity height is 0.4mm, and wide 5 mm.
1.2. Water filtration was performed using the fluid system described in 1.1.
1.3. And (4) measuring the turbidity of the effluent at the th outlet and the fourth outlet, and analyzing the granularity of the effluent by using a granularity analyzer, wherein the granularity analyzer is a Shanghai Sanxin TN100 turbidity meter and is operated according to the specification.
1.4. Analysis of results
As shown in FIG. 16, where green is the third outlet turbidity value and blue is the fourth outlet turbidity value, we can find that under different total flow conditions, 185mL/min can achieve the best separation effect, with the largest outlet turbidity value and the smallest fourth outlet turbidity value.
The effluent size analysis at the fourth outlet is shown in fig. 17, and most of the particles are about 20 microns, and the effluent size analysis at the third outlet is shown in fig. 18, and most of the particles are in the interval of 1000 microns. A separation effect can be achieved.
The effect of 0.45 micron filter filtration is shown in FIG. 19. The dark color is a filter graph of the outlet water of the third outlet, and the light color is a filter graph of the outlet water of the fourth outlet, which shows that after long-term operation, the accumulative effect can be seen by naked eyes, most particles are separated from the third outlet, and only a few particles flow out from the fourth outlet.
It will be appreciated by those skilled in the art that changes in this embodiment may be made without departing from the principles and spirit of the invention, the scope of which is defined by the claims appended hereto, and their equivalents in .
Claims (12)
1, Total phosphorus detection System, characterized in that, the Total phosphorus detection System at least includes:
the pretreatment module (1) is used for reducing particulate matters in the fluid to be detected;
the photocatalytic digestion module (2) is communicated with the pretreatment module, is used for carrying out digestion based on a photocatalytic reaction and is used for converting organic phosphorus in the fluid to be detected into inorganic phosphorus;
the microfluid detection module (3), with the photocatalysis digestion module intercommunication includes microfluid mixed subassembly (3.1) and microfluid detection subassembly (3.2) of intercommunication in proper order, microfluid mixed subassembly is used for mixing the colour development with the fluid that awaits measuring and detect with the medicine agent, microfluid detection subassembly is used for detecting the absorbance of the fluid that awaits measuring after the colour development.
2. The total phosphorus detection system according to claim 1, wherein the pre-processing module (1) comprises:
a pre-treatment inlet (1.1) for receiving a fluid to be tested;
an th arc-shaped separation channel (1.2) comprising a th liquid inlet and a 0 th liquid outlet, wherein the th liquid inlet is arranged at the end of the th arc-shaped separation channel (1.2) and is communicated with the pretreatment inlet (1.1), the th liquid outlet is arranged at the other end of the th arc-shaped separation channel (1.2) and comprises an th outlet (1.2.1) and a second outlet (1.2.2), and the th outlet (1.2.1) is far from the center of the arc-shaped circle compared with the second outlet (1.2.2);
a power assembly (1.3) comprising an th drive pump (1.3.1) and a second drive pump (1.3.2), the th drive pump (1.3.1) and second drive pump (1.3.2) driving fluid flow from the th outlet (1.2.1) and from the second outlet (1.2.2), respectively.
3. The total phosphorus detection system of claim 2, further comprising or more of the following features:
1) the power assembly (1.3) further comprises a controller which is respectively connected with the th driving pump (1.3.1) and the second driving pump (1.3.2);
2) the pretreatment module also comprises a second arc-shaped separation channel (1.4) and a second liquid outlet, wherein the second arc-shaped separation channel comprises a second liquid inlet (1.4.1) and a second liquid outlet, the second liquid inlet (1.4.1) is arranged at the end of the second arc-shaped separation channel (1.4) and is communicated with the second outlet (1.2.2), the second liquid outlet is arranged at the other end of the second arc-shaped separation channel (1.4) and comprises a third outlet (1.4.2) and a fourth outlet (1.4.3), and the third outlet (1.4.2) is far away from the arc-shaped circle center compared with the fourth outlet (1.4.3);
3) the pretreatment module also comprises a primary filter assembly (1.5) which is arranged between the pretreatment inlet (1.1) and the th arc-shaped separation channel (1.2) and is used for filtering large particles in the fluid to be detected.
4. The total phosphorus detection system of claim 1, wherein the photocatalytic digestion module comprises:
the photocatalytic digestion inlet (2.1) is communicated with the pretreatment module (1) and is used for receiving the fluid to be tested from the pretreatment module (1);
the photocatalytic digestion reaction pool (2.2) is communicated with the photocatalytic digestion inlet (2.1) and is used for carrying out photocatalytic reaction; the photocatalytic digestion reaction pool is internally provided with an anode (2.2.1) and a cathode (2.2.2), the anode is paved at the bottom of the photocatalytic digestion reaction pool, and the cathode (2.2.2) is arranged on the side wall of the photocatalytic digestion reaction pool and is not in direct contact with the anode (2.2.1);
an ultraviolet lamp (2.3) for providing a light source for the photocatalytic digestion reaction pool (2.2); and the photocatalytic digestion outlet (2.4) is communicated with the photocatalytic digestion reaction pool (2.2) and is used for discharging the fluid to be tested after reaction.
5. The total phosphorus detection system of claim 4, further comprising or more of the following features in the photocatalytic digestion module,
1) the anode (2.2.1) is in the shape of a thin sheet;
2) the cathode (2.2.2) surrounds the side wall without interruption;
3) the volume of the photocatalytic digestion reaction pool (2.2) is 25-1500 microliter;
4) the cathode (2.2.2) is a titanium electrode;
5) the photocatalytic digestion module also comprises a photocatalytic digestion heating component which is used for heating the photocatalytic digestion reaction pool;
6) the side of the photocatalytic digestion reaction tank is provided with a light transmitting opening, the ultraviolet lamp is arranged above the light transmitting opening, and the light transmitting opening is provided with light transmitting glass (2.5).
6. The total phosphorus detection system of claim 5, further comprising one or more of the following features:
7) in feature 6), the length of the ultraviolet lamp (2.3) is greater than halves of the length of the light-transmitting opening;
8) in the characteristic 6), the width of the ultraviolet lamp (2.3) does not exceed the width of the photocatalytic digestion reaction pool;
9) in the characteristic 6), the ultraviolet lamp (2.3) is arranged by being attached to the transparent glass (2.5);
10) feature 2) wherein the cathode (2.2.2) surrounds at least half of the perimeter of the sidewall.
7. The total phosphorus detection system according to claim 1, wherein the microfluidic mixing assembly (3.1) comprises:
the microfluid sample inlet (3.1.1) is communicated with the photocatalytic digestion module and is used for receiving the fluid to be detected from the photocatalytic digestion module;
a microfluidic medicament port (3.1.2) for receiving a medicament capable of reacting with a fluid to be tested;
a microfluid mixing cavity (3.1.3) which is respectively communicated with the microfluid injection port (3.1.1) and the microfluid medicament port (3.1.2) and is used for mixing a fluid to be detected and a medicament to enable a fluid flow sample to be detected to react with the medicament, a vent hole (3.1.3.1) is arranged on the side of the microfluid mixing cavity (3.1.3) , and the microfluid detection component (3.2) comprises:
the microfluid detection cavity (3.2.1) is communicated with the microfluid mixing cavity (3.1.3) and is used for detecting a liquid flow sample to be detected after reaction;
a light element (3.2.2) for providing a light source to the microfluidic detection chamber (3.2.1).
8. The total phosphorus detection system of claim 7, further comprising one or more of the following features:
1) the vent holes (3.1.3.1) are positioned on the side wall and/or the top end of the mixing cavity (3.1.3);
2) the diameter of the vent hole (3.1.3.1) is 1-5 mm;
3) a vibrator (3.1.4) is arranged below the micro-fluid mixing cavity (3.1.3);
4) the microfluid detection module also comprises a flow control component (3.3) which is used for driving the liquid flow sample to be detected to flow in the microfluid detection device and/or controlling the flow rate of the fluid to be detected.
9. The total phosphorus detection system according to claim 1, further comprising an electrolyte mixing module (4) disposed between the pretreatment module (1) and the photocatalytic digestion module (2) for adding and mixing an electrolyte for photocatalytic digestion.
10. The total phosphorus detection system of claim 9, wherein the electrolyte mixing module comprises: hollow mixing body (4.1) on mixing body's length direction, be equipped with mixed inlet of electrolyte (4.2) and the mixed liquid outlet of electrolyte (4.3), the mixed liquid outlet of electrolyte (4.3) with module (2) intercommunication is cleared up to photocatalysis electrolyte mix inlet (4.2) to electrolyte mix between the liquid outlet (4.3), it has a plurality of mixing unit (4.4) to communicate in proper order in mixing body (4.1), mixing unit (4.4) are hollow prism.
11. The total phosphorus detection system of claim 10, further comprising one or more of the following features in the electrolyte mixing module,
1) the mixing units (4.4) are selected from any or more of hollow quadrangular prism, hexagonal prism or octagonal prism;
2) the adjacent mixing units are communicated through communicating ports, and the communicating ports are positioned on the same line of ;
3) the heights of the hollow cavities of the mixing units (4.4) are equal;
4) the bottom area of the mixing unit (4.4) is 20-40mm2；
5) The areas of the bottom surfaces of the mixing units (4.4) are the same;
6) the shape and volume of each mixing unit (4.4) is .
12. The total phosphorus detection system of claim 11, further comprising one or more of the following features:
7) in the feature 1), the mixing units (4.4) are selected from or more hollow regular quadrangular prisms, regular hexagonal prisms or regular octagonal prisms;
8) in the characteristic 3), the height of the hollow cavity is 0.1-0.6 mm.
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