Rapid detection and analysis method for total nitrogen and phosphorus content in fertilizer industrial wastewater

Abstract

The invention provides a rapid detection and analysis method for the total nitrogen and phosphorus content in fertilizer industrial wastewater, belongs to the technical field of wastewater detection, and solves the technical problems of poor sampling effect and the like in the prior art. The rapid detection and analysis method for the total nitrogen and phosphorus content in the fertilizer industrial wastewater comprises the following steps: preparing a potassium persulfate solution, and putting the potassium persulfate solution into a storage box for later use; the method comprises the following steps: putting sampling equipment into a sampling pool, separating part of wastewater in a wastewater pool into a closed space by the sampling equipment, and dispersing the bottom of the wastewater; after the dispersion is completed, pumping the wastewater into a sampling box for storage by using a suction pump; the sampling box is mounted on the detection equipment through the quick connection mechanism, the sampling box is communicated with the detection box, and then the wastewater in the sampling box is fed into the detection box; and the potassium persulfate solution in the storage box is added into the detection box by using the quantitative liquid feeding mechanism, and is mixed and reacted with the wastewater. The method has the advantage of improving the detection accuracy and convenience of the total nitrogen and phosphorus content.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater monitoring and relates to a rapid detection and analysis method, in particular to a rapid detection and analysis method for total nitrogen and phosphorus contents in fertilizer industry wastewater. Background Art

[0002] Total nitrogen includes inorganic nitrogen such as nitrate, nitrite, and ammonium salts, and organic nitrogen such as proteins, amino acids, RNA, enzymes, and organic amines. Total nitrogen content is a key indicator of water quality, often used to indicate the degree of nutrient contamination in water bodies and is a key item in environmental water testing. Total phosphorus includes elemental phosphorus, orthophosphate, condensed sulfate, pyrophosphate, metaphosphate, and organically bound phosphates. Its main sources are domestic sewage, fertilizers, organophosphorus pesticides, and phosphate builders used in modern detergents. Excessive phosphorus can cause water to become foul and smelly, leading to eutrophication in lakes and the occurrence of red tides in bays. Therefore, the testing of total nitrogen and total phosphorus is extremely necessary.

[0003] A search revealed a Chinese patent document that discloses a method and system for detecting total nitrogen and total phosphorus [Application Number: 201410249295.6; Publication Number: CN 103983597 B]. This method involves heating a water sample containing potassium persulfate to 70-110°C in an alkaline, sealed environment for digestion for 1-10 minutes. The pH of the water sample is then adjusted to an acidic environment, and the sample is digested for another 1-10 minutes at 125-250°C to obtain a completely digested water sample. This avoids corrosion of the test vessel caused by the high-temperature alkaline environment, and the high temperature of 125-250°C accelerates the digestion process. The total nitrogen content is then determined using existing ultraviolet spectrophotometry. Ammonium molybdate reagent is then added to the completely digested water sample, and the total phosphorus content in the water sample is determined using ammonium molybdate spectrophotometry. In this way, after the water sample is digested, the total nitrogen and total phosphorus can be detected sequentially without the need for secondary digestion of the water sample, which further speeds up the detection time and improves the detection efficiency.

[0004] Although the detection method disclosed in this patent can perform sequential detection of total nitrogen and total phosphorus after the water sample is digested, without the need for secondary digestion of the water sample, which further speeds up the detection time and improves the detection efficiency, since wastewater will produce precipitation during storage, some nitrogen and phosphorus substances will settle to the bottom. When sampling, only the liquid above will be taken, which affects the accuracy of the detection. Even if a part of the precipitation is taken out during sampling, the ratio of precipitation to wastewater cannot be guaranteed, and the detection accuracy is limited. Summary of the Invention

[0005] The purpose of the present invention is to address the above-mentioned problems in the existing technology and propose a rapid detection and analysis method for the total nitrogen and phosphorus content in fertilizer industrial wastewater. The technical problem to be solved by this invention is: how to improve the accuracy and convenience of total nitrogen and phosphorus content detection.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A rapid detection and analysis method for total nitrogen and phosphorus content in fertilizer industry wastewater comprises the following steps:

[0008] S1. Prepare potassium persulfate solution and place it in a storage box for standby use;

[0009] S2. Place the sampling device into the sampling pool. The sampling device separates part of the wastewater into a closed space in the wastewater pool and then disperses the bottom of the wastewater;

[0010] S3. After dispersion is completed, the wastewater is pumped into a sampling box using a suction pump for storage;

[0011] S4. Install the sampling box on the testing equipment through the quick-connect mechanism, connect the sampling box with the testing box, and then send the wastewater in the sampling box into the testing box;

[0012] S5. Using a quantitative liquid delivery mechanism, the potassium persulfate solution in the storage box is added to the detection box to mix and react with the wastewater;

[0013] S6. After a reaction period, the light is emitted by the first light source at a wavelength of 220 nm. After passing through the detection box, the light is received by the first photodetector and sent to the circuit board assembly for signal processing and analog-to-digital conversion, thereby generating test data and calculating the total nitrogen content in the water to be tested.

[0014] S7. After the total nitrogen content is detected, sodium molybdate, potassium antimony tartrate, and ascorbic acid are added to the digestion detection pool for color development. The light path with a wavelength of 880 nm is emitted by a second light source. After passing through the detection box, the light is received by the second photodetector and sent to the circuit board assembly for signal processing and analog-to-digital conversion. The test data is then generated to calculate the total phosphorus content in the water body to be tested.

[0015] In step S5, during the reaction, the solution temperature is heated to 80-120° C., and the reaction time is 5-12 minutes.

[0016] The first light source is a deuterium lamp, and the second light source is an LED light source.

[0017] The equipment used in steps S1-S6 is a rapid detection equipment, which includes a frame, a detection box is fixed on the frame, a storage box is fixed on the upper end of the detection box, detection windows are provided on the left and right sides of the detection box, a first mounting plate and a second mounting plate are fixed on the upper side of the frame, a first light source and a second light source are fixed on the first mounting plate, a first photodetector and a second photodetector are fixed on the second detection plate, a quantitative liquid feeding mechanism is provided between the detection box and the storage box, a limit frame is fixed on the front side of the frame, a sampling box is provided in the limit frame, a quick connection mechanism is provided between the sampling box and the detection box, a sampling device is provided on the sampling box, an airbag is fixed on the outer periphery of the sampling box, and a handle is provided on the sampling box.

[0018] The working principle of the present invention is: when the working environment next to the wastewater pool is suitable for the detection equipment to pass through, the sampling box is placed on the limit frame, connected to the detection box through a quick connection mechanism, and then the device is pushed to the side of the wastewater pool through the frame, and the sampling equipment is placed in the sampling pool. The sampling equipment separates part of the wastewater in a closed space in the wastewater pool, and then disperses the bottom of the wastewater. After the dispersion is completed, the wastewater is pumped into the sampling box by a suction pump and then directly sent into the detection box. The potassium persulfate solution in the storage box is added to the detection box by a quantitative liquid feeding mechanism to mix and react with the wastewater; after a period of reaction, the first light source is used to emit a light path with a wavelength of 220nm, which passes through the detection box and is received by the first photodetector and sent to the circuit board assembly for signal processing and analog-to-digital conversion, thereby generating test data, and the total nitrogen content in the water body to be tested can be calculated; after the total nitrogen content is detected, sodium molybdate and tartaric acid are added to the digestion detection pool. After potassium antimony and ascorbic acid develop color, the second light source with an emission wavelength of 880nm is utilized. After passing through the detection box, it is received by the second photodetector and sent to the circuit board assembly for signal processing and analog-to-digital conversion, thereby generating test data. The total phosphorus content in the water body to be measured can be calculated. When the working environment next to the wastewater pool is not suitable for the detection equipment to pass, the sampling device can be removed first and placed in the sampling pool. The sampling device separates part of the wastewater in a closed space in the wastewater pool and then disperses the bottom of the wastewater. After the dispersion is completed, the wastewater is pumped into the sampling box for storage using a suction pump. The sampling box is installed on the detection equipment through a quick-connect mechanism, the sampling box is connected to the detection box, and the wastewater in the sampling box is then sent to the detection box. The above-mentioned detection steps are repeated. The use of this equipment can not only be applicable to different working environments, but also can make sampling more uniform, preventing precipitation at the bottom of the wastewater pool from affecting the accuracy of detection.

[0019] A storage chamber and a quantitative chamber are provided in the storage box, an extraction port is provided between the quantitative chamber and the storage chamber, the quantitative liquid feeding mechanism includes a piston slidably connected to the quantitative chamber, a threaded rod is rotatably connected to the piston, the other end of the threaded rod extends out of the storage box and is fixed with a handle, an adjustment plate is threadedly connected to the second threaded rod, the adjustment plate is slidably connected to the quantitative chamber, a discharge port is provided at the lower end of the quantitative chamber, a liquid feeding pipe is fixedly connected to the discharge port, the lower end of the liquid feeding pipe is communicated with the detection box, a one-way valve is provided in both the discharge port and the extraction port, an observation window is provided on the quantitative chamber, and a scale is provided on the observation window.

[0020] With the above structure, when delivering liquid, the handle is used to pull the piston to move, and the potassium persulfate solution in the storage chamber is extracted into the quantitative chamber until the adjustment plate contacts the side wall of the quantitative chamber. Then, the piston is pushed in the opposite direction to deliver the potassium persulfate solution in the quantitative chamber into the detection box through the liquid delivery pipe. When the amount of liquid delivery needs to be adjusted, the adjustment plate is driven to move by rotating the threaded rod, and the position of the adjustment plate is observed through the observation window, which facilitates precise adjustment and realizes the adjustment limit of the piston movement distance to meet different detection needs.

[0021] The quick-connect mechanism includes a first quick-connect assembly and a second quick-connect assembly, the first quick-connect assembly includes a liquid inlet pipe, the liquid inlet pipe is connected to the detection box, the other end of the liquid inlet pipe is fixed with a first quick connector, a first quick-connect cavity is provided in the first quick connector, the first quick-connect cavity is provided with a first insertion port at one end away from the liquid inlet pipe, a first inclined surface is provided at one end of the first quick-connect cavity close to the first insertion port, a plurality of first positioning rings are provided in the first quick-connect cavity, a first spring is fixed in the first quick-connect cavity, the other end of the first spring conflicts with the first positioning ring, a first positioning pipe is fixed in the first quick-connect cavity, the liquid inlet pipe is connected to the first positioning pipe, a sealing gasket is provided inside the first positioning pipe, the inlet of the sealing gasket is a trumpet-shaped structure, a suction pump is fixed on the sampling box, a water outlet pipe is fixed on the suction pump, the other end of the water outlet pipe passes through the first insertion port and the first positioning ring in sequence and is inserted into the first positioning pipe, and an unlocking port connected to the first quick-connect cavity is provided on the first quick connector.

[0022] With the above structure, when working, the other end of the water outlet pipe is passed through the first insertion port and the first positioning ring in sequence and then inserted into the first positioning tube. The connection between the detection box and the sampling box can be completed by utilizing the cooperation of the first spring, the positioning ring and the first inclined surface. The operation is simple and convenient, and the inlet of the sealing gasket is a trumpet-shaped structure to facilitate the water outlet pipe to enter the first positioning tube, and ensure the sealing of the connection to prevent leakage of waste liquid. When disassembly is required, a screwdriver or other tool is inserted into the unlocking port and the first positioning ring is adjusted to release the limit on the liquid delivery pipe, so that the liquid delivery pipe can be easily pulled out, saving time and effort.

[0023] The second quick-connect assembly includes a connecting rod, one end of the connecting rod is fixedly connected to the detection box, and the other end of the connecting rod is fixed with a second quick connector, a second quick-connect cavity is provided in the second quick connector, a second insertion port is provided at an end of the second quick-connect cavity away from the connecting rod, a second inclined surface is provided at an end of the second quick-connect cavity close to the second insertion port, a plurality of second positioning rings are provided in the second quick-connect cavity, a second spring is fixed in the second quick-connect cavity, the other end of the second spring is in conflict with the second positioning ring, a second positioning tube is fixed in the second quick-connect cavity, a plug-in rod is fixed on the sampling box, the other end of the plug-in rod passes through the second insertion port and the second positioning ring in sequence and is inserted into the second positioning tube, and an unlocking port connected to the second quick-connect cavity is provided on the second quick connector.

[0024] With the above structure, when the detection box is connected with the sampling box, the connecting rod is passed through the second insertion port and the second positioning ring in sequence and then inserted into the second positioning tube. Under the action of the second spring, the second inclined surface and the second positioning ring, the second positioning ring locks the connecting rod to achieve fixation to the sampling box. In combination with the first quick-connect assembly, the sampling box has high stability. When disassembling, it can be operated in the same way as the first quick-connect assembly, which is simple and convenient.

[0025] The sampling equipment includes a connecting frame, which is fixedly connected to the sampling box, a flip motor is fixed on the connecting frame, a flip seat is fixed to the output shaft end of the flip motor, a sampling seat is fixed on the flip seat, a telescopic tube is fixed to the lower end of the sampling seat, a counterweight seat is fixed to the lower end of the telescopic tube, a water pump is fixed on the sampling box, the water pump is connected to the sampling seat through a hose, a winding mechanism is fixed inside the counterweight seat, a pull rope is provided on the winding mechanism, and the other end of the pull rope is fixedly connected to the sampling seat.

[0026] With the above structure, when the sampling box is installed on the frame for use, the telescopic tube and the sampling box are ensured to be parallel, the frame pushes the sampling box to the side of the wastewater pool, and the telescopic tube is placed into the wastewater pool. Then the winding mechanism performs the pay-off operation, and under the action of the counterweight seat, the telescopic tube sinks to the bottom of the wastewater pool, so that the telescopic tube separates the wastewater pool into a sealed environment, which is convenient for sealed sampling. When the sampling box works alone, the sampling box is directly placed in the wastewater pool, and the sampling box floats to the surface under the action of the airbag. At the same time, through the cooperation of the flip motor and the flip seat, the telescopic tube is made perpendicular to the sampling box, and then the above operation is repeated to perform sampling. It can not only meet different usage needs, but also when not in use, the telescopic tube can be folded up without taking up space, which is convenient for transfer and storage.

[0027] An inflation cavity is provided inside the counterweight seat, an air pump is fixed in the inflation cavity, an air inlet pipe of the air pump is connected to the outside through a pipeline, an air jet pipe is fixed at the air outlet end of the air pump, and a plurality of air jet ports are provided on the periphery of the air jet pipe.

[0028] With the above structure, when the counterweight seat sinks to the bottom of the wastewater pool, it is inflated by the air pump, so that the jet pipe sprays air to the surrounding areas, thereby lifting the sediment at the bottom of the wastewater pool, making it evenly distributed inside and improving the uniformity of sampling.

[0029] A partition is fixed in the detection box, and a driving cavity is formed between the lower side of the partition and the detection box, a rotating motor is fixed in the driving cavity, a rotating disk is fixed to the output shaft end of the rotating motor, a first magnet and a second magnet are fixed on the rotating disk, the upper side of the partition is rotatably connected to a rotating ring, the rotating ring consists of a third magnet and a fourth magnet, a stirring column is fixed on the rotating ring, a plurality of stirring blades are fixed on the stirring column, an elastic component is fixed on the upper side of the partition, a catapult plate is fixed on the elastic component, a plurality of trapezoidal seats are distributed in a ring on the upper side of the catapult plate, a support rod is fixed on the stirring column, a rotating wheel is rotatably connected to the support rod, and the rotating wheel fits with the trapezoidal seat.

[0030] With the above mechanism, when working, the rotating motor drives the first magnet and the second magnet to rotate through the rotating disk, the first magnet and the third magnet are attracted, and the second magnet and the fourth magnet are attracted, thereby driving the stirring blade to rotate through the rotating ring to stir and mix the reaction liquid, thereby improving the reaction effect. At the same time, the setting of this structure can prevent the stirring blade from blocking the detection window, ensuring the normal progress of the detection work, and the rotating motor has no contact with the stirring blade, so that the temperature of the internal reaction liquid will not be transmitted to the rotating motor, ensuring the stability of the work. When the stirring column rotates, it drives the rotor to rotate, and the cooperation of the rotor and the trapezoidal seat can press the ejection plate down, and the spring ejection plate bounces up under the action of the elastic component, thereby raising the sediment at the bottom, thereby improving the reaction effect.

[0031] Compared with the existing technology, this rapid detection and analysis method for total nitrogen and phosphorus content in fertilizer industrial wastewater has the following advantages:

[0032] 1. By adopting the detection method of the present invention, the nitrogen and phosphorus substances in the wastewater can be evenly distributed during sampling, thereby ensuring the accuracy of sampling and thus the accuracy of detection. At the same time, it is not necessary to disturb all the wastewater in the wastewater pool, thereby reducing the detection cost and difficulty. This method is not only applicable to different working environments, but also can make the sampling more uniform, preventing precipitation at the bottom of the wastewater pool from affecting the accuracy of detection.

[0033] 2. When the working environment next to the wastewater pool is suitable for the detection equipment to pass through, the sampling box is placed on the limit frame, connected to the detection box through the quick connection mechanism, and then the device is pushed to the side of the wastewater pool through the frame, and the sampling equipment is placed in the sampling pool. The sampling equipment separates part of the wastewater in a closed space in the wastewater pool, and then disperses the bottom of the wastewater. After the dispersion is completed, the wastewater is pumped into the sampling box by a suction pump and then directly sent into the detection box. The potassium persulfate solution in the storage box is added to the detection box by a quantitative liquid feeding mechanism to mix and react with the wastewater; after a period of reaction, the first light source is used to emit a light path with a wavelength of 220nm. After passing through the detection box, it is received by the first photodetector and sent to the circuit board assembly for signal processing and analog-to-digital conversion, and then the test data is generated, and the total nitrogen content in the water to be tested can be calculated; after the total nitrogen content is tested, sodium molybdate, potassium antimony tartrate and antimony tartrate are added to the digestion detection pool. After ascorbic acid develops color, the second light source is used to emit an 880nm optical path at a wavelength. After passing through the detection box, it is received by the second photodetector and sent to the circuit board assembly for signal processing and analog-to-digital conversion, thereby generating test data. The total phosphorus content in the water body to be measured can be calculated. When the working environment next to the wastewater pool is not suitable for the detection equipment to pass, the sampling device can be removed first and placed in the sampling pool. The sampling device separates part of the wastewater in a closed space in the wastewater pool and then disperses the bottom of the wastewater. After the dispersion is completed, a suction pump is utilized to draw the wastewater into the sampling box for storage. The sampling box is installed on the detection equipment through a quick-connect mechanism, the sampling box is connected to the detection box, and the wastewater in the sampling box is then sent into the detection box. The above-mentioned detection steps are repeated. The use of this equipment can not only be applicable to different working environments, but also can make sampling more uniform, preventing the sedimentation at the bottom of the wastewater pool from affecting the accuracy of detection.

[0034] 3. When delivering liquid, pull the piston by the handle to move the potassium persulfate solution in the storage chamber to the quantitative chamber until the adjustment plate contacts the side wall of the quantitative chamber, and then push the piston in the opposite direction to deliver the potassium persulfate solution in the quantitative chamber into the detection box through the liquid delivery tube. When the amount of liquid delivery needs to be adjusted, the adjustment plate is driven to move by rotating the threaded rod, and the position of the adjustment plate is observed through the observation window, so as to facilitate precise adjustment and realize the adjustment limit of the piston movement distance to meet different detection needs.

[0035] 4. During operation, the other end of the water outlet pipe is passed through the first insertion port and the first positioning ring in sequence and then inserted into the first positioning tube. The connection between the detection box and the sampling box can be completed by utilizing the cooperation of the first spring, the positioning ring and the first inclined surface. The operation is simple and convenient, and the inlet of the sealing gasket is a trumpet-shaped structure, which is convenient for the water outlet pipe to enter the first positioning tube and ensure the sealing of the connection to prevent leakage of waste liquid. When disassembly is required, a screwdriver or other tool is inserted into the unlocking port and the first positioning ring is adjusted to release the limit on the liquid delivery pipe, so that the liquid delivery pipe can be easily pulled out, saving time and effort.

[0036] 5. When the sampling box is installed on the frame for use, the telescopic tube and the sampling box are ensured to be parallel. The frame pushes the sampling box to the side of the wastewater pool, places the telescopic tube into the wastewater pool, and then the reeling mechanism performs the pay-off operation. Under the action of the counterweight seat, the telescopic tube sinks to the bottom of the wastewater pool, so that the telescopic tube separates the wastewater pool into a sealed environment, which is convenient for sealed sampling. When the sampling box works alone, the sampling box is directly placed in the wastewater pool. Under the action of the airbag, the sampling box floats to the surface. At the same time, through the cooperation of the flip motor and the flip seat, the telescopic tube is made perpendicular to the sampling box, and then the above operation is repeated to perform sampling. It can not only meet different usage needs, but also when not in use, the telescopic tube can be put away without taking up space, which is convenient for transfer and storage.

[0037] 6. When the counterweight seat sinks to the bottom of the wastewater pool, it is inflated by the air pump, so that the jet pipe sprays air to the surrounding areas, thereby lifting the sediment at the bottom of the wastewater pool, making it evenly distributed inside and improving the uniformity of sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a process flow chart of the present invention.

[0039] Figure 2 It is a structural schematic diagram of the rapid detection equipment in the present invention.

[0040] Figure 3 It is a structural schematic diagram of the storage box in the present invention.

[0041] Figure 4 It is a structural schematic diagram of the sampling box in the present invention.

[0042] Figure 5 It is a structural schematic diagram of the sampling device in the present invention.

[0043] Figure 6 It is a structural schematic diagram of the detection box in the present invention.

[0044] Figure 7 It is a structural schematic diagram of the ejection plate in the present invention.

[0045] Figure 8It is a structural schematic diagram of the second quick-connect assembly in the present invention.

[0046] Figure 9 It is a structural schematic diagram of the first quick-connect assembly in the present invention.

[0047] In the figure, 1, frame; 2, detection box; 3, first mounting plate; 4, first light source; 5, second light source; 6, second mounting plate; 7, second photoelectric detector; 8, first photoelectric detector; 9, storage box; 10, liquid feeding pipe; 11, liquid inlet pipe; 12, storage chamber; 13, quantitative chamber; 14, extraction port; 15, discharge port; 16, piston; 17, threaded rod; 18, handle; 19, adjustment plate; 20, observation window; 21, detection window; 22, first quick connector; 23, connecting rod; 24, second quick connector; 25, sampling box; 26, suction pump; 27, water outlet pipe; 28, handle; 29, plug-in rod; 30, air bag; 31, connecting frame; 32, flip motor; 33, flip seat; 34. Sampling seat; 35. Telescopic tube; 36. Counterweight seat; 37. Water pump; 38. Pull rope; 39. Inflatable chamber; 40. Air pump; 41. Jet tube; 42. Partition; 43. Rotating motor; 44. Rotating disk; 45. First magnet; 46. Second magnet; 47. Fourth magnet; 48. Third magnet; 49. Stirring column; 50. Stirring blade; 51. Elastic component; 52. Support rod; 53. Ejection plate; 54. Rotating wheel; 55. Trapezoidal seat; 56. Second insertion port; 57. Second positioning ring; 58. Second positioning tube; 59. Second spring; 60. First insertion port; 61. First positioning ring; 62. First spring; 63. First positioning tube; 64. Sealing pad; 65. Winding mechanism. DETAILED DESCRIPTION

[0048] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0049] like Figures 1-9 As shown, the rapid detection and analysis method for the total nitrogen and phosphorus content in fertilizer industrial wastewater includes the following steps:

[0050] S1, prepare potassium persulfate solution, put it into storage box 9 for standby;

[0051] S2. Place the sampling device into the sampling pool. The sampling device separates part of the wastewater into a closed space in the wastewater pool and then disperses the bottom of the wastewater;

[0052] S3. After dispersion is completed, the wastewater is pumped into the sampling box 25 by the suction pump 26 for storage;

[0053] S4. Install the sampling box 25 on the detection equipment through the quick-connect mechanism, connect the sampling box 25 with the detection box 2, and then send the wastewater in the sampling box 25 into the detection box 2;

[0054] S5. Use a quantitative liquid delivery mechanism to add the potassium persulfate solution in the storage box 9 into the detection box 2 to mix and react with the wastewater;

[0055] S6. After a period of reaction, the light is emitted by the first light source 4 at a wavelength of 220 nm. After passing through the detection box 2, it is received by the first photodetector 8 and sent to the circuit board assembly for signal processing and analog-to-digital conversion, thereby generating test data and calculating the total nitrogen content in the water to be tested;

[0056] S7. After the total nitrogen content is detected, sodium molybdate, potassium antimony tartrate and ascorbic acid are added to the digestion detection pool for color development. The second light source 5 is used to emit a light path with a wavelength of 880nm. After passing through the detection box 2, it is received by the second photodetector 7 and sent to the circuit board assembly for signal processing and analog-to-digital conversion, thereby generating test data, and the total phosphorus content in the water to be tested can be calculated.

[0057] In step S5, during the reaction, the solution temperature is heated to 80-120° C., and the reaction time is 5-12 minutes.

[0058] The first light source 4 is a deuterium lamp, and the second light source 5 is an LED light source.

[0059] The equipment used in steps S1-S6 is a rapid detection equipment, which includes a frame 1, a detection box 2 is fixed on the frame 1, a storage box 9 is fixed on the upper end of the detection box 2, and detection windows 21 are provided on the left and right sides of the detection box 2, a first mounting plate 3 and a second mounting plate 6 are fixed on the upper side of the frame 1, a first light source 4 and a second light source 5 are fixed on the first mounting plate 3, a first photoelectric detector 8 and a second photoelectric detector 7 are fixed on the second detection plate, a quantitative liquid feeding mechanism is provided between the detection box 2 and the storage box 9, a limit frame is fixed on the front side of the frame 1, a sampling box 25 is provided in the limit frame, a quick connection mechanism is provided between the sampling box 25 and the detection box 2, a sampling device is provided on the sampling box 25, an airbag 30 is fixed on the outer periphery of the sampling box 25, and a handle 28 is provided on the sampling box 25.

[0060] The working principle of the present invention is: when the working environment next to the wastewater pool is suitable for the detection equipment to pass through, the sampling box 25 is placed on the limit frame, connected to the detection box 2 through the quick connection mechanism, and then the device is pushed to the side of the wastewater pool through the frame 1, and the sampling equipment is placed in the sampling pool. The sampling equipment separates part of the wastewater in a closed space in the wastewater pool, and then disperses the bottom of the wastewater. After the dispersion is completed, the wastewater is pumped into the sampling box 25 by the suction pump 26 and then directly sent into the detection box 2. The potassium persulfate solution in the storage box 9 is added to the detection box 2 by the quantitative liquid feeding mechanism to mix and react with the wastewater; after a period of reaction, the first light source 4 is used to emit a light path with a wavelength of 220nm. After passing through the detection box 2, it is received by the first photodetector 8 and sent to the circuit board assembly for signal processing and analog-to-digital conversion, and then the test data is generated, and the total nitrogen content in the water body to be tested can be calculated; after the total nitrogen content is detected, sodium molybdate and tartaric acid are added to the digestion detection pool. After antimony potassium and ascorbic acid develop the color, utilizing the second light source 5 emission wavelengths is 880nm light path, after passing detection box 2, receive by the second photodetector 7, be sent to circuit board assembly and carry out signal processing and analog to digital conversion, and then generate test data, the total phosphorus content in the water body to be measured can be calculated, when the working environment beside the wastewater pond was not suitable for detection equipment in the past, sampling device can be taken off earlier, sampling device is put in the sampling pond, sampling device is separated in the wastewater pond by part wastewater in the enclosed space, and then the bottom of wastewater is dispersed; After dispersion is completed, utilize suction pump 26 that wastewater is pumped into the sampling box 25 and deposit; Sampling box 25 is installed on the detection equipment by quick-connect mechanism, sampling box 25 is communicated with detection box 2, then the wastewater in the sampling box 25 is sent in the detection box 2, repeat above-mentioned testing step, adopt this equipment not only can be applicable to different working environments, and can make sampling more even, prevent the accuracy that the wastewater pond bottom sedimentation influences detection.

[0061] A storage chamber 12 and a quantitative chamber 13 are provided in the storage box 9, and an extraction port 14 is provided between the quantitative chamber 13 and the storage chamber 12. The quantitative liquid feeding mechanism includes a piston 16 slidably connected to the quantitative chamber 13, and a threaded rod 17 is rotatably connected to the piston 16. The other end of the threaded rod 17 extends out of the storage box 9 and is fixed with a handle 18. An adjustment plate 19 is threadedly connected to the second threaded rod 17, and the adjustment plate 19 is slidably connected to the quantitative chamber 13. A discharge port 15 is provided at the lower end of the quantitative chamber 13, and a liquid feeding pipe 10 is fixedly connected to the discharge port 15. The lower end of the liquid feeding pipe 10 is communicated with the detection box 2. A one-way valve is provided in the discharge port 15 and the extraction port 14. An observation window 20 is provided on the quantitative chamber 13, and a scale is provided on the observation window 20.

[0062] With the above structure, when delivering liquid, the handle 18 is used to pull the piston 16 to move, and the potassium persulfate solution in the storage chamber 12 is extracted into the quantitative chamber 13 until the adjustment plate 19 contacts the side wall of the quantitative chamber 13, and then the piston 16 is pushed in the reverse direction to deliver the potassium persulfate solution in the quantitative chamber 13 into the detection box 2 through the liquid delivery pipe 10. When the amount of liquid delivery needs to be adjusted, the threaded rod 17 is rotated to drive the adjustment plate 19 to move, and the position of the adjustment plate 19 is observed through the observation window 20, so as to facilitate precise adjustment and realize the adjustment limit of the moving distance of the piston 16 to meet different detection requirements.

[0063] The quick-connect mechanism includes a first quick-connect assembly and a second quick-connect assembly. The first quick-connect assembly includes a liquid inlet pipe 11, which is connected to the detection box 2. A first quick-connect joint 22 is fixed to the other end of the liquid inlet pipe 11. A first quick-connect cavity is provided in the first quick-connect joint 22. A first insertion port 60 is provided at one end of the first quick-connect cavity away from the liquid inlet pipe 11. A first inclined surface is provided at one end of the first quick-connect cavity close to the first insertion port 60. A plurality of first positioning rings 61 are provided in the first quick-connect cavity. A first spring 62 is fixed in the first quick-connect cavity. The first spring 62 The other end of the first positioning ring 61 is in conflict with the first positioning tube 63, and the first quick-connect cavity is fixed with a first positioning tube 63. The liquid inlet pipe 11 is connected to the first positioning tube 63. A sealing gasket 64 is provided inside the first positioning tube 63. The inlet of the sealing gasket 64 is a trumpet-shaped structure. A suction pump 26 is fixed on the sampling box 25, and a water outlet pipe 27 is fixed on the suction pump 26. The other end of the water outlet pipe 27 passes through the first insertion port 60 and the first positioning ring 61 in sequence and is inserted into the first positioning tube 63. The first quick connector 22 is provided with an unlocking port connected to the first quick-connect cavity.

[0064] With the above structure, when working, the other end of the water outlet pipe 27 is passed through the first insertion port 60 and the first positioning ring 61 in turn and then inserted into the first positioning tube 63. The first spring 62, the positioning ring and the first inclined surface cooperate to complete the connection between the detection box 2 and the sampling box 25. The operation is simple and convenient, and the inlet of the sealing gasket 64 is a trumpet-shaped structure to facilitate the water outlet pipe 27 to enter the first positioning tube 63, and ensure the sealing of the connection to prevent waste liquid leakage. When disassembly is required, a screwdriver or other tool is inserted into the unlocking port and the first positioning ring 61 is adjusted to release the limit on the liquid delivery pipe 10, so that the liquid delivery pipe 10 can be easily pulled out, saving time and effort.

[0065] The second quick-connect assembly includes a connecting rod 23, one end of the connecting rod 23 is fixedly connected to the detection box 2, and the other end of the connecting rod 23 is fixed with a second quick connector 24, a second quick-connect cavity is provided in the second quick connector 24, and the second quick-connect cavity is provided with a second insertion port 56 at the end away from the connecting rod 23, and a second inclined surface is provided at the end of the second quick-connect cavity close to the second insertion port 56, a plurality of second positioning rings 57 are provided in the second quick-connect cavity, a second spring 59 is fixed in the second quick-connect cavity, the other end of the second spring 59 is in conflict with the second positioning ring 57, a second positioning tube 58 is fixed in the second quick-connect cavity, a plug-in rod 29 is fixed on the sampling box 25, and the other end of the plug-in rod 29 passes through the second insertion port 56 and the second positioning ring 57 in sequence and then is inserted into the second positioning tube 58, and the second quick connector 24 is provided with an unlocking port connected to the second quick-connect cavity.

[0066] With the above structure, when the detection box 2 is connected to the sampling box 25, the plug-in rod 29 is sequentially passed through the second insertion port 56 and the second positioning ring 57 and then inserted into the second positioning tube 58. Under the action of the second spring 59, the second inclined surface and the second positioning ring 57, the second positioning ring 57 locks the plug-in rod 29 to fix the sampling box 25. In combination with the first quick-connect assembly, the sampling box 25 has high stability. When disassembling, it can be operated in the same way as the first quick-connect assembly, which is simple and convenient.

[0067] The sampling equipment includes a connecting frame 31, which is fixedly connected to the sampling box 25. A flip motor 32 is fixed on the connecting frame 31, a flip seat 33 is fixed to the output shaft end of the flip motor 32, a sampling seat 34 is fixed to the flip seat 33, a telescopic tube 35 is fixed to the lower end of the sampling seat 34, a counterweight seat 36 is fixed to the lower end of the telescopic tube 35, a water pump 37 is fixed to the sampling box 25, the water pump 37 is connected to the sampling seat 34 through a hose, a winding mechanism 65 is fixed inside the counterweight seat 36, a pull rope 38 is provided on the winding mechanism 65, and the other end of the pull rope 38 is fixed to the sampling seat 34.

[0068] When the sampling box 25 is installed on the frame 1 for use, the telescopic tube 35 is ensured to be parallel to the sampling box 25. The frame 1 pushes the sampling box 25 to the side of the wastewater tank, puts the telescopic tube 35 into the wastewater tank, and then the winding mechanism 65 performs the line-releasing operation. Under the action of the counterweight seat 36, the telescopic tube 35 sinks to the bottom of the wastewater tank, so that the telescopic tube 35 separates the wastewater tank into a sealed environment, which is convenient for sealed sampling. When the sampling box 25 works alone, the sampling box 25 is directly placed in the wastewater tank. Under the action of the airbag 30, the sampling box 25 floats to the surface. At the same time, through the cooperation of the flip motor 32 and the flip seat 33, the telescopic tube 35 is made perpendicular to the sampling box 25. Then the above operation is repeated to perform sampling. It can not only meet different usage needs, but also when not in use, the telescopic tube 35 can be folded up without taking up space, which is convenient for transfer and storage.

[0069] An inflation chamber 39 is provided inside the counterweight seat 36 , and an air pump 40 is fixed inside the inflation chamber 39 . The air inlet pipe of the air pump 40 is connected to the outside through a pipeline. An air jet pipe 41 is fixed to the air outlet end of the air pump 40 , and a plurality of air jet ports are provided on the periphery of the air jet pipe 41 .

[0070] With the above structure, when the counterweight seat 36 sinks to the bottom of the wastewater pool, it is inflated by the air pump 40, so that the air jet pipe 41 sprays air to the surroundings, thereby lifting the sediment at the bottom of the wastewater pool, making it evenly distributed inside, and improving the uniformity of sampling.

[0071] A partition 42 is fixed in the detection box 2, and a driving cavity is formed between the lower side of the partition 42 and the detection box 2, and a rotating motor 43 is fixed in the driving cavity. A rotating disk 44 is fixed to the output shaft end of the rotating motor 43, and a first magnet 45 and a second magnet 46 are fixed on the rotating disk 44. The upper side of the partition 42 is rotatably connected to a rotating ring, which consists of a third magnet 48 and a fourth magnet 47. A stirring column 49 is fixed on the rotating ring, and a number of stirring blades 50 are fixed on the stirring column 49. An elastic component 51 is fixed on the upper side of the partition 42, and an ejection plate 53 is fixed on the elastic component 51. A number of trapezoidal seats 55 are distributed in a ring on the upper side of the ejection plate 53. A support rod 52 is fixed on the stirring column 49, and a rotating wheel 54 is rotatably connected to the support rod 52, and the rotating wheel 54 is in contact with the trapezoidal seat 55.

[0072] With the above mechanism, when working, the rotating motor 43 drives the first magnet 45 and the second magnet 46 to rotate through the rotating disk 44, the first magnet 45 and the third magnet 48 are attracted, and the second magnet 46 and the fourth magnet 47 are attracted, thereby driving the stirring blade 50 to rotate through the rotating ring, stirring and mixing the reaction liquid, and improving the reaction effect. At the same time, the setting of this structure can prevent the stirring blade 50 from blocking the detection window 21, ensuring the normal progress of the detection work, and the rotating motor 43 has no contact with the stirring blade 50, so that the temperature of the internal reaction liquid will not be transmitted to the rotating motor 43, ensuring the stability of the work. When the stirring column 49 rotates, it drives the turntable 54 to rotate. The cooperation of the turntable 54 and the trapezoidal seat 55 can press the ejection plate 53 down, and the spring ejection plate 53 bounces up under the action of the elastic component 51, thereby raising the sediment at the bottom, improving the reaction effect.

[0073] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A rapid detection and analysis method for total nitrogen and phosphorus content in fertilizer industry wastewater, characterized in that: The following steps are involved: S1, prepare potassium persulfate solution, and place it in a storage box (9) for standby use; S2. Place the sampling device into the sampling pool. The sampling device separates part of the wastewater into a closed space in the wastewater pool and then disperses the bottom of the wastewater; S3. After the dispersion is completed, the wastewater is pumped into the sampling box (25) by using a suction pump (26) for storage; S4, installing the sampling box (25) on the detection equipment through the quick connection mechanism, connecting the sampling box (25) with the detection box (2), and then sending the wastewater in the sampling box (25) into the detection box (2); S5, using a quantitative liquid feeding mechanism to add the potassium persulfate solution in the storage box (9) into the detection box (2) to mix and react with the wastewater; S6. After a period of reaction, the light is emitted by the first light source (4) at a wavelength of 220 nm. After passing through the detection box (2), the light is received by the first photodetector (8) and sent to the circuit board assembly for signal processing and analog-to-digital conversion, thereby generating test data and calculating the total nitrogen content in the water body to be tested; S7. After the total nitrogen content is detected, sodium molybdate, potassium antimony tartrate and ascorbic acid are added to the digestion detection pool for color development. The light path with a wavelength of 880 nm is emitted by the second light source (5). After passing through the detection box (2), it is received by the second photodetector (7) and sent to the circuit board assembly for signal processing and analog-to-digital conversion, thereby generating test data and calculating the total phosphorus content in the water body to be tested.

2. The rapid detection and analysis method for total nitrogen and phosphorus content in fertilizer industrial wastewater according to claim 1, characterized in that: In step S5, during the reaction, the solution temperature is heated to 80-120° C., and the reaction time is 5-12 minutes.

3. The rapid detection and analysis method for total nitrogen and phosphorus content in fertilizer industrial wastewater according to claim 1, characterized in that: The first light source (4) is a deuterium lamp, and the second light source (5) is an LED light source.

4. The rapid detection and analysis method for total nitrogen and phosphorus content in fertilizer industrial wastewater according to claim 1, characterized in that: The equipment used in the steps S1-S6 is a rapid detection equipment, which includes a vehicle frame (1), a detection box (2) fixed on the vehicle frame (1), a storage box (9) fixed on the upper end of the detection box (2), detection windows (21) arranged on both the left and right sides of the detection box (2), a first mounting plate (3) and a second mounting plate (6) fixed on the upper side of the vehicle frame (1), a first light source (4) and a second light source (5) fixed on the first mounting plate (3), a first photoelectric detector (8) and a second photoelectric detector (7) fixed on the second detection plate, a quantitative liquid feeding mechanism arranged between the detection box (2) and the storage box (9), a limit frame fixed on the front side of the vehicle frame (1), a sampling box (25) arranged in the limit frame, a quick connection mechanism arranged between the sampling box (25) and the detection box (2), a sampling device arranged on the sampling box (25), an air bag (30) fixed on the outer periphery of the sampling box (25), and a handle (28) arranged on the sampling box (25).

5. The rapid detection and analysis method for total nitrogen and phosphorus content in fertilizer industrial wastewater according to claim 4, characterized in that: The storage box (9) is provided with a storage chamber (12) and a quantitative chamber (13), an extraction port (14) is provided between the quantitative chamber (13) and the storage chamber (12), a quantitative liquid feeding mechanism comprises a piston (16) slidably connected in the quantitative chamber (13), a threaded rod (17) is rotatably connected to the piston (16), the other end of the threaded rod (17) extends out of the storage box (9) and is fixed with a handle (18), an adjustment plate (19) is threadedly connected to the second threaded rod (17), the adjustment plate (19) is slidably connected to the quantitative chamber (13), a discharge port (15) is provided at the lower end of the quantitative chamber (13), a liquid feeding pipe (10) is fixedly connected to the discharge port (15), the lower end of the liquid feeding pipe (10) is communicated with the detection box (2), a one-way valve is provided in both the discharge port (15) and the extraction port (14), an observation window (20) is provided on the quantitative chamber (13), and a scale is provided on the observation window (20).

6. The rapid detection and analysis method for total nitrogen and phosphorus content in fertilizer industrial wastewater according to claim 4, characterized in that: The quick-connect mechanism includes a first quick-connect assembly and a second quick-connect assembly. The first quick-connect assembly includes a liquid inlet pipe (11), the liquid inlet pipe (11) is connected to the detection box (2), the other end of the liquid inlet pipe (11) is fixed with a first quick connector (22), a first quick-connect cavity is provided in the first quick connector (22), an end of the first quick-connect cavity away from the liquid inlet pipe (11) is provided with a first insertion port (60), an end of the first quick-connect cavity close to the first insertion port (60) is provided with a first inclined surface, a plurality of first positioning rings (61) are provided in the first quick-connect cavity, a first spring (62) is fixed in the first quick-connect cavity, and the other end of the first spring (62) is provided with a first positioning ring (61). The first quick-connect cavity is in conflict with the first positioning ring (61), a first positioning tube (63) is fixed in the first quick-connect cavity, the liquid inlet tube (11) is communicated with the first positioning tube (63), a sealing gasket (64) is provided inside the first positioning tube (63), the inlet of the sealing gasket (64) is a trumpet-shaped structure, a suction pump (26) is fixed on the sampling box (25), a water outlet pipe (27) is fixed on the suction pump (26), the other end of the water outlet pipe (27) passes through the first insertion port (60) and the first positioning ring (61) in sequence and is inserted into the first positioning tube (63), and an unlocking port communicated with the first quick-connect cavity is opened on the first quick-connect cavity.

7. The rapid detection and analysis method for total nitrogen and phosphorus content in fertilizer industrial wastewater according to claim 6, characterized in that: The second quick-connect assembly includes a connecting rod (23), one end of the connecting rod (23) is fixedly connected to the detection box (2), the other end of the connecting rod (23) is fixed with a second quick connector (24), a second quick-connect cavity is provided in the second quick connector (24), the second quick-connect cavity is provided with a second insertion port (56) at one end away from the connecting rod (23), a second inclined surface is provided at one end of the second quick-connect cavity close to the second insertion port (56), a plurality of second positioning rings (57) are provided in the second quick-connect cavity, a second spring (59) is fixed in the second quick-connect cavity, the other end of the second spring (59) is in contact with the second positioning ring (57), a second positioning tube (58) is fixed in the second quick-connect cavity, a plug-in rod (29) is fixed on the sampling box (25), the other end of the plug-in rod (29) passes through the second insertion port (56) and the second positioning ring (57) in sequence and is inserted into the second positioning tube (58), and an unlocking port connected to the second quick-connect cavity is provided on the second quick connector (24).

8. The method for rapid detection and analysis of total nitrogen and phosphorus content in fertilizer industrial wastewater according to claim 4, characterized in that: The sampling device comprises a connecting frame (31), the connecting frame (31) is fixedly connected to the sampling box (25), a turning motor (32) is fixed on the connecting frame (31), a turning seat (33) is fixed to the output shaft end of the turning motor (32), a sampling seat (34) is fixed on the turning seat (33), a telescopic tube (35) is fixed to the lower end of the sampling seat (34), a counterweight seat (36) is fixed to the lower end of the telescopic tube (35), a water pump (37) is fixed to the sampling box (25), the water pump (37) is connected to the sampling seat (34) through a hose, a reeling mechanism (65) is fixed inside the reeling mechanism (65), a pull rope (38) is provided on the reeling mechanism (65), and the other end of the pull rope (38) is fixedly connected to the sampling seat (34).

9. The method for rapid detection and analysis of total nitrogen and phosphorus content in fertilizer industrial wastewater according to claim 8, characterized in that: An inflation chamber (39) is provided inside the counterweight seat (36), an air pump (40) is fixed inside the inflation chamber (39), an air inlet pipe of the air pump (40) is connected to the outside through a pipeline, an air jet pipe (41) is fixed at the air outlet end of the air pump (40), and a plurality of air jet ports are provided on the periphery of the air jet pipe (41).

10. The method for rapid detection and analysis of total nitrogen and phosphorus content in fertilizer industry wastewater according to claim 4, characterized in that: A partition (42) is fixed in the detection box (2), a driving cavity is formed between the lower side of the partition (42) and the detection box (2), a rotating motor (43) is fixed in the driving cavity, a rotating disk (44) is fixed to the output shaft end of the rotating motor (43), a first magnet (45) and a second magnet (46) are fixed on the rotating disk (44), and a rotating ring is rotatably connected to the upper side of the partition (42), and the rotating ring is composed of a third magnet (48) and a fourth magnet (47). A stirring column (49) is fixed on the rotating ring, a plurality of stirring blades (50) are fixed on the stirring column (49), an elastic component (51) is fixed on the upper side of the partition (42), a catapult plate (53) is fixed on the elastic component (51), a plurality of trapezoidal seats (55) are distributed in an annular manner on the upper side of the catapult plate (53), a support rod (52) is fixed on the stirring column (49), a rotating wheel (54) is rotatably connected to the support rod (52), and the rotating wheel (54) is fitted with the trapezoidal seat (55).

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