A small multi-parameter water quality on-line monitoring system and method with integrated flow path and application thereof

Abstract

The application provides a small multi-parameter water quality on-line monitoring system and method with integrated flow path and application thereof, comprising a sample inlet flow path module, a chemical pretreatment module and a spectrum detection module; the sample inlet flow path module comprises a pneumatic device composed of multiple gas valves, a multi-way valve, a peristaltic pump and connecting pipelines to realize effective switching, sequential sampling and waste discharge of water samples to be measured, standard solutions, chemical reagents and pure water; the chemical pretreatment module comprises an ammonia-nitrogen digestion chamber, a permanganate index digestion chamber and a total nitrogen / total phosphorus digestion chamber; after total phosphorus and total nitrogen are digested in the same digestion chamber, the total phosphorus enters the ammonia-nitrogen digestion chamber for spectrum detection and analysis. The application realizes simultaneous measurement of four chemical module parameters, i.e. ammonia-nitrogen, total phosphorus, total nitrogen and permanganate index, through three digestion / colorimetric devices; therefore, the multi-parameters are integrated in the integrated flow path, and the complexity of the whole detection equipment is reduced.

Description

Technical Field

[0001] This invention relates to the field of water quality monitoring technology, and in particular to a small-scale multi-parameter online water quality monitoring system, method, and application with an integrated flow path. Background Technology

[0002] Water quality monitoring mainly involves monitoring and measuring the types of pollutants in water bodies, the concentrations and trends of various pollutants, and evaluating the water quality status.

[0003] Water quality monitoring encompasses a wide range of topics, including both unpolluted and polluted natural water, as well as various types of industrial wastewater. The main monitoring items fall into two categories: one is comprehensive indicators reflecting water quality, such as temperature, color, turbidity, pH, conductivity, suspended solids, dissolved oxygen, chemical oxygen demand (COD), and biochemical oxygen demand (BOD); the other is toxic substances, such as phenols, cyanides, arsenic, lead, chromium, cadmium, mercury, and organochlorine pesticides. The most crucial aspect of water quality monitoring is the objective evaluation of the water quality of rivers and oceans.

[0004] Traditional environmental water quality testing primarily relies on manual sampling and laboratory instrument analysis. This method only offers comprehensive analytical capabilities in well-equipped laboratories. Current testing requirements typically demand high monitoring frequency and minimal sampling errors to reflect changes in pollution levels and meet real-world testing needs. Based on existing monitoring requirements and the increasing rigor and strictness of relevant national policies, laws, and regulations, high-quality instruments, micro-scale design, simultaneous multi-parameter measurement, modular design, and network-based information technology have become the development trends for next-generation instruments.

[0005] Existing online monitoring systems are mostly single-parameter or two-parameter systems. Multi-parameter systems typically require the integration of multiple flow paths to achieve complete detection functionality, resulting in excessively large overall equipment size, limited applicability to various operating conditions, high site requirements, and low equipment integration. Furthermore, the repetitive and cumbersome sample introduction process, the cross-fertilization of multiple reagents, and the sharing of quantitative systems can easily lead to long testing procedures, affecting the stability and accuracy of measurements.

[0006] Existing water quality analyzers typically can only detect one type of parameter. To detect multiple types of parameters, multiple controllers are needed to control multiple types of sensors, resulting in limited functionality and poor data interpretability.

[0007] Existing online multi-parameter water quality monitoring instruments require multiple units, or multiple units integrated with multiple flow paths, to complete the measurement of multiple parameters, resulting in a large number of accessories and a large footprint. The small multi-parameter analyzer described in this invention uses the same digestion conditions and oxidant for total nitrogen and total phosphorus, allowing for the sharing of the same digestion chamber, thus reducing the consumption of digestion chambers and oxidant. It can complete the digestion and measurement of multiple parameters under the same flow path, effectively reducing the equipment footprint and improving the overall integrity and mobility of the equipment.

[0008] Existing multi-parameter online monitoring instruments require repeated quantitative sampling of reagents, and the time of multiple parameters is superimposed, resulting in slow detection speed and low efficiency.

[0009] As a water quality monitoring instrument that requires the detection of multiple parameters, how to solve the problems of redundant detection systems and large size of water quality monitoring instruments, and achieve stable measurement of multiple parameters in a miniaturized and accurate manner, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0010] To address the aforementioned problems, the first objective of this invention is to provide a small-scale, multi-parameter online water quality monitoring system with an integrated flow path.

[0011] Therefore, the above-mentioned objectives of the present invention are achieved through the following technical solutions:

[0012] A small-scale, multi-parameter online water quality monitoring system with an integrated flow path is characterized by comprising a sample inlet flow path module, a chemical pretreatment module, and a spectral detection module. The sample inlet flow path module includes a pneumatic device consisting of multiple air valves, a multi-port valve, a peristaltic pump, and connecting pipelines to achieve effective switching, sequential injection, and waste discharge of the water sample to be tested, standard solution, chemical reagents, and pure water. The water sample to be tested and the chemical reagents are sent by the sample inlet flow path module to the chemical pretreatment module for high-temperature and high-pressure online digestion and spectral detection and analysis. The chemical pretreatment module includes an ammonia nitrogen digestion chamber, a permanganate index digestion chamber, and a total nitrogen / total phosphorus digestion chamber, wherein total phosphorus is digested in the same digestion chamber as total nitrogen, and then enters the ammonia nitrogen digestion chamber for spectral detection and analysis.

[0013] While adopting the above technical solutions, the present invention may also adopt or combine the following technical solutions:

[0014] As a preferred technical solution of the present invention: the upper ports of the ammonia nitrogen digestion chamber and the permanganate index digestion chamber are connected to a pneumatic device composed of multiple air valves and a multi-pump peristaltic pump, and a pressure relief vent is provided. Ammonia nitrogen, total phosphorus and permanganate reagents are simultaneously and accurately quantified by the multi-pump peristaltic pump and sent into the corresponding digestion chambers by the pneumatic device composed of multiple air valves and the second peristaltic pump. The digestion tubes of each digestion chamber are equipped with a temperature control heating device and a fan.

[0015] As a preferred technical solution of the present invention: each digestion chamber has optical fibers and spectrometers corresponding to the detection light source wavelength on both sides of the digestion tube for spectral detection and analysis.

[0016] As a preferred technical solution of the present invention: total nitrogen and total phosphorus are digested in the total nitrogen / total phosphorus digestion chamber, and the total nitrogen is subjected to spectral detection and analysis. After the ammonia nitrogen spectral detection and analysis are completed, the liquid in the total nitrogen / total phosphorus digestion chamber is sent to the ammonia nitrogen digestion chamber for testing by a second peristaltic pump.

[0017] Another objective of this invention is to provide a small-scale, multi-parameter online water quality monitoring method using an integrated flow path in the system described above.

[0018] Therefore, the present invention is achieved through the following technical solution:

[0019] Water samples are drawn by the first peristaltic pump and quantitatively introduced into the ammonia nitrogen digestion chamber, permanganate index digestion chamber, and total nitrogen / total phosphorus digestion chamber by the second peristaltic pump. Pure water is drawn by the first peristaltic pump to clean the total nitrogen / total phosphorus digestion chamber, and waste liquid is discharged by the peristaltic pump.

[0020] In the ammonia nitrogen digestion chamber, ammonia nitrogen blank detection is performed by introducing ammonia nitrogen reagent through the second peristaltic pump and starting digestion. In the total nitrogen / total phosphorus digestion chamber, reagent is extracted by the first peristaltic pump and quantitatively introduced into the total nitrogen through the second peristaltic pump and starting digestion. In the permanganate index digestion chamber, permanganate reagent is introduced through the second peristaltic pump and starting digestion.

[0021] The ammonia nitrogen digestion chamber completes ammonia nitrogen detection. Waste liquid is discharged through a peristaltic pump, and pure water is drawn through a second peristaltic pump to clean the ammonia nitrogen digestion chamber. The waste liquid is discharged again through a peristaltic pump. The total nitrogen / total phosphorus digestion chamber completes total nitrogen colorimetric analysis. The digestion solution is pumped into the ammonia nitrogen digestion chamber through a second peristaltic pump for total phosphorus blank detection. Total phosphorus reagent is introduced through a second peristaltic pump for total phosphorus colorimetric analysis.

[0022] The total nitrogen / total phosphorus digestion chamber is cleaned with pure water by the second peristaltic pump, and a blank test for total nitrogen is completed. The permanganate index digestion chamber completes the permanganate colorimetric test, and the waste liquid is discharged into the waste liquid outlet of the second multi-way valve by the first peristaltic pump. The ammonia nitrogen digestion chamber is cleaned with pure water by the first peristaltic pump, and a blank test for permanganate is completed. The waste liquid is discharged into the waste liquid outlet of the second multi-way valve again by the second peristaltic pump. The ammonia nitrogen digestion chamber completes the total phosphorus test, and the waste liquid is discharged externally by the peristaltic pump. The chemical module process measurement is completed by the first peristaltic pump, which also draws pure water and discharges the waste liquid externally.

[0023] The third objective of this invention is the application of a small-scale, multi-parameter online water quality monitoring system using the integrated flow path of the system described above.

[0024] Therefore, the present invention is achieved through the following technical solution:

[0025] The system includes a chassis, a pre-water circuit, a water distribution unit, a detection module, a data acquisition and transmission unit, and a control unit. The pre-water circuit collects water samples from the water body to be monitored for analysis. The water distribution unit distributes the water samples collected by the pre-water circuit to the detection module for analysis. The detection module includes a chemical detection module and a conventional five-parameter detection pool. The data acquisition and transmission unit collects and processes the output signals from the detection module in a predetermined manner and transmits the detection data and operating parameters to the host computer. The control unit includes a touch screen and a microcontroller control system. The touch screen displays various detection parameters in real time, and the detection is operated by the microcontroller control system. The chassis is layered, with the pre-water circuit at the bottom. The conventional five-parameter detection pool and the chemical detection module are arranged sequentially on the pre-water circuit. The pre-water circuit provides water samples to the five-parameter detection pool and the chemical detection module through the water distribution unit and the layers of each layer.

[0026] While adopting the above technical solutions, the present invention may also adopt or combine the following technical solutions:

[0027] As a preferred technical solution of the present invention: the pre-water circuit includes a water intake pump and a water intake pipeline. The water intake pipeline is connected to the water distribution unit to inject, drain, and clean the water samples from the five-parameter detection pool and the chemical detection module.

[0028] As a preferred technical solution of the present invention: the chassis is equipped with an air conditioner to regulate the internal ambient temperature of the chassis, and the exhaust vent of the air conditioner is discharged through the side wall of the chassis.

[0029] As a preferred technical solution of the present invention: a touch screen is provided on the upper end of the front cover of the chassis, and the touch screen is connected to the microcontroller control system through a circuit. The microcontroller control system is located on the top layer of the chassis.

[0030] The present invention has the following technical effects:

[0031] (1) It can realize the simultaneous measurement of four chemical module parameters, namely ammonia nitrogen, total phosphorus, total nitrogen permanganate index, through three digestion / colorimetric devices; thus, multiple parameters are integrated into an integrated flow path, reducing the complexity of the entire detection equipment.

[0032] (2) The integrated flow path has the function of simultaneously and accurately and stably measuring permanganate index, ammonia nitrogen, total nitrogen and total phosphorus, which improves the integration of the equipment. At the same time, the equipment has the function of measuring the five conventional parameters. The overall integration is high, the equipment occupies a small area, and the application scenarios and working conditions are more extensive.

[0033] (3) The integrated flow path detection is fast, and multiple reagents can be quantified at one time, reducing the testing time for multiple parameters. The peristaltic pump air-push system ensures a small dead volume and ultra-high synchronization rate, ensuring the stability and accuracy of quantitative injection, and ultimately ensuring the accuracy and stability of test data.

[0034] (4) The integrated flow path small multi-parameter online water quality monitoring system of the present invention is applied to a small outdoor water quality monitoring station and is used as the chemical detection module of the small outdoor water quality monitoring station. That is, the water body is tested for five parameters turbidity, conductivity, dissolved oxygen, temperature and pH through the pre-water path, and the water is pumped into the integrated chemical module for testing by the peristaltic pump. The ammonia nitrogen, total phosphorus, total nitrogen and permanganate index are detected synchronously in the same flow path system. The permanganate index is colorimetrically measured in an independent digestion chamber, and the total phosphorus and total nitrogen are digested in the same digestion chamber. The total nitrogen is colorimetrically measured. The digested total phosphorus and ammonia nitrogen share the same colorimetric device. The ammonia nitrogen digestion and colorimetry are performed first, and then the total phosphorus is colorimetrically measured.

[0035] (5) The integrated flow path small-scale multi-parameter online water quality monitoring system of the present invention will share water sample tubes, pure water tubes and waste liquid tubes, reducing the number of water samples in various water quality analyses, reducing the total amount of waste liquid, and reducing the amount of consumables used during maintenance. Each chemical module supports independent operation and detection, avoiding reagent interference, improving detection accuracy and the flexibility of equipment detection combinations.

[0036] (6) In each digestion system of the present invention, the optical fiber (total nitrogen xenon lamp), the spectral detector and the digestion system are integrated, which facilitates the digestion process and the measurement is completed in the digestion system, saving measurement time and flow path space.

[0037] (7) The device of the present invention has the functions of five-parameter probe and chemical module testing. The maintenance of each detection function is centralized and convenient. The replacement and maintenance of pure water, waste liquid and reagents are also more centralized, which increases the convenience of equipment management and increases the maintenance and start-up speed of equipment testing.

[0038] (8) The present invention uses a quantitative loop for quantitative injection. This quantitative injection mode has a simple structure, good repeatability and stability, is easy to replace, has low maintenance costs, and is applicable to a wider range of platforms. Attached Figure Description

[0039] Figure 1 This is a flow path diagram of the small-scale multi-parameter online water quality monitoring system with integrated flow path according to the present invention;

[0040] Figure 2 This is a front view of the open chassis of the small outdoor water quality monitoring station of the present invention;

[0041] Figure 3 This is a rear view of the small outdoor water quality monitoring station of the present invention with the rear cover of the casing open.

[0042] In the attached diagram, the following components are included: 1. Pre-water supply line; 102. Water intake pipeline; 2. Water distribution unit; 3. Conventional five-parameter detection pool; 4. Chemical detection module; 5. Touch screen; 6. Chassis; 7. Third peristaltic pump; 8. Air conditioner; 9. Refrigerator; 10. Air pump; 11. Single-chip microcomputer control system; 12. Multi-unit peristaltic pump; 13. Pneumatic device composed of multi-way air valves; 14. Ammonia nitrogen digestion chamber; 15. Permanganate index digestion chamber; 21. Total nitrogen / total phosphorus digestion chamber; 16. First peristaltic pump; 17. Second peristaltic pump (air pump); 18. Waste liquid peristaltic pump; 19. First multi-way valve; 20. Second multi-way valve; 22. Liquid level gauge. Detailed Implementation

[0043] The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

[0044] like Figure 1 This invention discloses a small-scale multi-parameter online water quality monitoring system with an integrated flow path, comprising a sample inlet flow path module, a chemical pretreatment module, and a spectral detection module. The sample inlet flow path module includes a pneumatic device consisting of multiple air valves, a multi-way valve, a peristaltic pump, and connecting pipelines to achieve effective switching, sequential injection, and waste discharge of the water sample to be tested, standard solution, chemical reagents, and pure water. The water sample to be tested and the chemical reagents are sent by the sample inlet flow path module to the chemical pretreatment module for high-temperature and high-pressure online digestion and spectral detection and analysis. The chemical pretreatment module includes an ammonia nitrogen digestion chamber 14, a permanganate index digestion chamber 15, and a total nitrogen / total phosphorus digestion chamber 21, wherein total phosphorus is digested in the same digestion chamber as total nitrogen, and then enters the ammonia nitrogen digestion chamber for spectral detection and analysis.

[0045] This invention discloses a small-scale multi-parameter online water quality monitoring system with an integrated flow path. The flow path includes a pneumatic device composed of multiple air valves, a digestion chamber, and an air blowing pipeline composed of a multi-connected peristaltic pump and air valves. The second peristaltic pump 17 is connected to the first multi-port valve 19, mainly serving as a channel for total nitrogen reagent and waste liquid, and is connected to the lower ends of the ammonia nitrogen digestion chamber 14, the permanganate index digestion chamber 15, and the total nitrogen / total phosphorus digestion chamber 21. The common end of the second multi-port valve 20 is connected to the first multi-port valve 19, mainly serving as a channel for water sample, standard solution, pure water, and waste liquid. The level gauge 22 between the second multi-port valve 20 and the second peristaltic pump 17 performs quantitative measurement of the liquid within the multi-port valve.

[0046] The upper ports of the ammonia nitrogen digestion chamber 14 and the permanganate index digestion chamber 15 are connected to a pneumatic device 13 consisting of multiple gas valves and a multi-pump peristaltic pump 12, and a pressure relief vent is provided. Ammonia nitrogen, total phosphorus and permanganate reagents are simultaneously and accurately quantified by the multi-pump peristaltic pump 12, and sent into the corresponding digestion chambers through the gas valves in the pneumatic device 13 consisting of multiple gas valves and the provided second peristaltic pump 17. Each digestion chamber digestion tube has a temperature control heating device and a fan, and optical fibers and spectral detectors of the corresponding detection light source wavelengths are provided on both sides of the digestion tube.

[0047] Since the oxidant and digestion conditions are the same as those for total phosphorus, the total nitrogen / total phosphorus is digested in the total nitrogen / total phosphorus digestion chamber 21, and the total nitrogen is tested. Then, it is discharged into the ammonia nitrogen digestion chamber 14 through the second peristaltic pump 17 to test the total phosphorus. At the same time, since the ammonia nitrogen test process is faster and the wavelength of the main channel light source is the same as that of total phosphorus, the ammonia nitrogen test process is performed before the total phosphorus digestion enters the ammonia nitrogen digestion chamber 14. In order to prevent the reagents from affecting the metering loop from the second multi-way valve 20 to the second peristaltic pump 17, the waste liquid in the ammonia nitrogen digestion chamber 14 is directly discharged through the waste liquid peristaltic pump 18.

[0048] In this invention, the ammonia nitrogen digestion chamber is equipped with a direct discharge system to improve the stability of equipment operation. Based on the mutual influence of oxidation-reduction reactions between reagents, a peristaltic pump is installed in the ammonia nitrogen digestion chamber to directly discharge the reaction reagents and cleaning waste liquid from ammonia nitrogen and total phosphorus tests. This avoids the mutual influence between parameters by bypassing the common quantitative loop and reduces the amount of cleaning liquid used. While saving testing time, this invention combines a multi-pump-air-push precise quantitative method to ensure the stability and accuracy of equipment operation.

[0049] The integrated flow path miniaturized multi-parameter online measurement method of the present invention includes the following steps:

[0050] Reagents (ammonia nitrogen, total phosphorus, permanganate) are introduced into the multi-unit peristaltic pump 12, and each digestion tube is emptied. Water samples are drawn through the first peristaltic pump 16 and quantitatively introduced into the ammonia nitrogen digestion chamber 14, the permanganate index digestion chamber 15, and the total nitrogen / total phosphorus digestion chamber 21 through the second peristaltic pump 17. Pure water is drawn through the first peristaltic pump 16 to clean the total nitrogen / total phosphorus digestion chamber 21, and waste liquid is discharged through the waste liquid peristaltic pump 18.

[0051] In the ammonia nitrogen digestion chamber 14, ammonia nitrogen blank detection is performed by introducing ammonia nitrogen reagent through the second peristaltic pump 17 and starting digestion. In the total nitrogen / total phosphorus digestion chamber 21, reagent is drawn by the first peristaltic pump 16 and quantitatively introduced into the total nitrogen through the second peristaltic pump 17 and starting digestion. In the permanganate index digestion chamber 15, permanganate reagent is introduced through the second peristaltic pump 17 and starting digestion.

[0052] The ammonia nitrogen digestion chamber 14 completes the ammonia nitrogen detection. Waste liquid is discharged through the waste liquid peristaltic pump 18, and pure water is drawn through the second peristaltic pump 17 to clean the ammonia nitrogen digestion chamber 14. The waste liquid is discharged again through the waste liquid peristaltic pump 18. The total nitrogen / total phosphorus digestion chamber 21 completes the total nitrogen colorimetric determination. The digestion solution is pumped into the ammonia nitrogen digestion chamber 14 through the second peristaltic pump 17 for the total phosphorus blank detection. The total phosphorus reagent is introduced through the second peristaltic pump 17 for the total phosphorus colorimetric determination.

[0053] The total nitrogen / total phosphorus digestion chamber 21 is cleaned with pure water by the second peristaltic pump 17, and a blank test of total nitrogen is completed. The permanganate index digestion chamber 15 completes the permanganate colorimetric test and the waste liquid is discharged into the waste liquid outlet of the second multi-way valve 20 by the first peristaltic pump 16. The ammonia nitrogen digestion chamber 14 is cleaned with pure water by the first peristaltic pump 16, and a blank test of permanganate is completed. The waste liquid is discharged into the waste liquid outlet of the second multi-way valve 20 by the second peristaltic pump 17 again. The ammonia nitrogen digestion chamber 14 completes the total phosphorus test and the waste liquid is discharged through the waste liquid peristaltic pump 18. The pure water is drawn by the first peristaltic pump 16 and the waste liquid is discharged through the waste liquid peristaltic pump 18.

[0054] This invention discloses a small-scale, multi-parameter online water quality monitoring system and method with an integrated flow path. It utilizes the same oxidant and digestion conditions for total phosphorus and total nitrogen (TP), enabling TP and TP to share the same digestion chamber and digestion tube. Simultaneously, it leverages the faster testing process for ammonia nitrogen and the fact that the main channel light source wavelength for ammonia nitrogen is consistent with that for TP. Furthermore, it utilizes the shared spectral detection module for both TP and ammonia nitrogen, achieving chemical pretreatment and spectral analysis of water samples for four water quality parameters through three flow paths. This simplifies the sample introduction flow path module, chemical pretreatment module, and spectral detection module of the integrated flow path small-scale, multi-parameter online water quality monitoring system. It also reduces the amount of water samples and reagents used, lowering water quality monitoring costs, waste discharge costs, and subsequent wastewater treatment costs. This invention provides a small-scale, multi-parameter online water quality monitoring system with an integrated flow path. In this invention, the water quality analysis module control system achieves integration. The control system of the water quality analysis module is set as one, which can simultaneously control three digestion module units to measure permanganate index, ammonia nitrogen, total nitrogen, and total phosphorus, thereby improving the integration level of the integrated flow path equipment. By setting scripts, the various parameters of the integrated flow path can be interleaved, saving the measurement time of multiple parameters while retaining the independence of accurate measurement of individual parameters.

[0055] The integrated flow path based on the multi-pump-air propulsion technology of this invention has significant advantages over multi-parameter testing. The system has a high degree of integration and can achieve simultaneous measurement of multiple parameters through a single flow path. It has a fast detection speed, can quantify multiple reagents at once, and reduces the testing time for multiple parameters.

[0056] This invention discloses a small-scale multi-parameter online water quality monitoring system and method with an integrated flow path, which ensures accurate sample introduction through air propulsion. Due to the multi-channel peristaltic pump for sample introduction, there is no risk of reagent cross-contamination or interference, making it suitable for the detection of various parameters. The multi-channel peristaltic pump-air pump quantitative system ensures synchronization rate, guaranteeing the stability and accuracy of the test.

[0057] The present invention discloses a small-scale multi-parameter online water quality monitoring system and method with an integrated flow path. By synchronously quantifying reagents through a multi-pump peristaltic pump, and with each air pump having its corresponding reagent pipeline independent, redundant reagent replacements are avoided, thus reducing the overall reagent consumption.

[0058] The present invention discloses a small-scale multi-parameter online water quality monitoring system and method with an integrated flow path. Based on the mutual influence of oxidation-reduction reactions between reagents, the system sets up direct discharge of waste liquid in the ammonia nitrogen digestion chamber, avoiding the use of a metering loop to prevent mutual influence between parameters and ensure the stability and accuracy of equipment operation.

[0059] The present invention relates to an application of a small-scale multi-parameter online water quality monitoring system with an integrated flow path, which is used in a small outdoor water quality monitoring station as a chemical detection module.

[0060] A small-scale, multi-parameter online water quality monitoring system with an integrated flow path is applied to a small outdoor water quality monitoring station. The system includes a chassis, a pre-flow water path, a water distribution unit, a detection module, a data acquisition and transmission unit, and a control unit. The pre-flow water path collects water samples from the water body to be monitored for analysis. The water distribution unit distributes the water samples collected by the pre-flow water path to the detection module for analysis. The detection module includes a chemical detection module and a conventional five-parameter detection pool. The data acquisition and transmission unit collects and processes the output signals from the detection module in a predetermined manner and transmits the detection data and operating parameters to a host computer. The control unit includes a touch screen and a microcontroller control system. The touch screen displays various detection parameters in real time, and the detection is operated via the microcontroller control system. The chassis is layered, with the pre-flow water path at the bottom. The conventional five-parameter detection pool and the chemical detection module are sequentially arranged on the pre-flow water path. The pre-flow water path, through the water distribution unit, passes through the layers to provide water samples to the five-parameter detection pool and the chemical detection module.

[0061] In this invention, the conventional five parameters in the conventional five-parameter detection cell 3 refer to pH, conductivity, dissolved oxygen, turbidity, and temperature.

[0062] In this invention, the pre-water system, conventional five-parameter detection pool, and chemical detection module are installed in separate compartments within the chassis 6 through a layered design. This modular design facilitates installation and disassembly. The pre-water system 1 is located at the bottom layer of the chassis 6, while the upper part is divided into two layers with the chemical detection module 4 and the conventional five-parameter detection pool 3. This allows for quick and convenient installation of detection modules as needed. The rational partitioning arrangement minimizes the horizontal area occupied by the testing station, achieving miniaturization and integration of the water quality testing station.

[0063] In this invention, the pre-water circuit 1 includes a water intake pump and a water intake pipeline 102. The water intake pipeline 102 is connected to the water distribution unit 2 and is used for water sample injection, drainage and cleaning of the five-parameter detection pool 3 and the chemical monitoring module 4.

[0064] The chassis 6 is equipped with an air conditioner 8 to regulate the internal temperature of the chassis 6, and the exhaust vent of the air conditioner 8 is discharged through the side wall of the chassis 6.

[0065] The front cover of the chassis 6 is equipped with a touch screen 5. The touch screen 5 is connected to the microcontroller control system through a circuit. The microcontroller control system is located on the top layer of the chassis 6.

[0066] In this invention, the water distribution unit 2 includes a third peristaltic pump 7 disposed on the side wall of the casing 6. The third peristaltic pump is equipped with an air pump 10 to push chemical reagents into the chemical detection module 4 through the third peristaltic pump.

[0067] A refrigerator 9 is also provided to store the reagents required for chemical testing. The refrigerator 9 is placed inside the chassis 6 near the back and at the bottom of the chemical testing module 4.

[0068] The present invention relates to an integrated flow path small multi-parameter online water quality monitoring system, which is applied to a small outdoor water quality monitoring station. It serves as the chemical detection module of the small outdoor water quality monitoring station, integrating an industrial control computer with multiple chemical modules and conventional five parameters into one unit. It can realize flexible combination detection of multiple parameters, select detection range, and has the function of synchronous conventional five-parameter probe, which is suitable for real-time detection of surface water bodies.

[0069] The above specific embodiments are used to explain and illustrate the present invention, and are only preferred embodiments of the present invention, not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made to the present invention within the spirit and scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A small-sized multi-parameter water quality on-line monitoring system with integrated flow path, characterized in that: It includes a sample injection flow path module, a chemical pretreatment module, and a spectral detection module. The sample injection flow path module includes a pneumatic device consisting of multiple air valves, a multi-way valve, a peristaltic pump and its connecting pipelines to achieve effective switching, sequential injection and waste discharge of water samples to be tested, standard solutions, chemical reagents and pure water; The water sample and chemical reagents are fed into the chemical pretreatment module by the sample introduction flow path module for high-temperature and high-pressure online digestion, followed by spectral detection and analysis. The chemical pretreatment module includes: an ammonia nitrogen digestion chamber, a permanganate index digestion chamber, and a total nitrogen / total phosphorus digestion chamber; The permanganate index was measured colorimetrically in a separate permanganate index digestion chamber; total nitrogen and total phosphorus were digested in the same total nitrogen / total phosphorus digestion chamber, and the total nitrogen was then subjected to spectral detection and analysis in the same chamber; the digested total phosphorus was sent to the ammonia nitrogen digestion chamber and used the same colorimetric device as the ammonia nitrogen, where the ammonia nitrogen was digested and colorimetrically measured first, followed by the total phosphorus.

2. The integrated flow path small multi-parameter water quality on-line monitoring system according to claim 1, characterized in that: The peristaltic pump includes a multi-stage peristaltic pump and a second peristaltic pump. The upper ports of the ammonia nitrogen digestion chamber and the permanganate index digestion chamber are connected to a pneumatic device consisting of multiple air valves and the multi-stage peristaltic pump. At the same time, a pressure relief vent is provided. Ammonia nitrogen, total phosphorus and permanganate reagents are simultaneously and accurately quantified by the multi-stage peristaltic pump and sent into the corresponding digestion chambers through the pneumatic device consisting of multiple air valves and the second peristaltic pump. The digestion tubes of each digestion chamber are equipped with a temperature control heating device and a fan.

3. The integrated flow path small-scale multi-parameter online water quality monitoring system as described in claim 2, characterized in that: Each digestion chamber has optical fibers and spectrometers on both sides of the digestion tube corresponding to the detection light source wavelength for spectral detection and analysis.

4. The integrated flow path small-scale multi-parameter online water quality monitoring system as described in claim 3, characterized in that: Total nitrogen and total phosphorus are digested in the total nitrogen / total phosphorus digestion chamber, and the total nitrogen is subjected to spectral detection and analysis. After the ammonia nitrogen spectral detection and analysis are completed, the liquid in the total nitrogen / total phosphorus digestion chamber is sent to the ammonia nitrogen digestion chamber for total phosphorus testing through the second peristaltic pump.

5. A monitoring method for a small-scale multi-parameter online water quality monitoring system employing the integrated flow path described in any one of claims 1-4, characterized in that, The peristaltic pump includes a first peristaltic pump, a second peristaltic pump, and a waste liquid peristaltic pump; the multi-way valve includes a first multi-way valve and a second multi-way valve; the method includes the following steps: Step 1: Extract water samples using the first peristaltic pump, and quantitatively deliver the water samples into the ammonia nitrogen digestion chamber, permanganate index digestion chamber, and total nitrogen / total phosphorus digestion chamber using the second peristaltic pump; use the first peristaltic pump to extract pure water to clean the total nitrogen / total phosphorus digestion chamber, and discharge waste liquid using the waste liquid peristaltic pump; Step 2: In the ammonia nitrogen digestion chamber, an ammonia nitrogen blank test is performed. Ammonia nitrogen reagent is added through the second peristaltic pump, and digestion begins. In the total nitrogen / total phosphorus digestion chamber, reagent is drawn out through the first peristaltic pump, and total nitrogen reagent is quantitatively added through the second peristaltic pump, and digestion begins. In the permanganate index digestion chamber, permanganate reagent is added through the second peristaltic pump, and digestion begins. Step 3: After the ammonia nitrogen detection is completed in the ammonia nitrogen digestion chamber, the waste liquid is discharged through the waste liquid peristaltic pump, and pure water is drawn out to clean the ammonia nitrogen digestion chamber through the second peristaltic pump. The cleaned waste liquid is discharged again through the waste liquid peristaltic pump. After the total nitrogen colorimetric determination is completed in the total nitrogen / total phosphorus digestion chamber, the digestion solution is pumped into the ammonia nitrogen digestion chamber through the second peristaltic pump for total phosphorus blank detection. Then, total phosphorus reagent is added through the second peristaltic pump for total phosphorus colorimetric determination. Step 4: Use the second peristaltic pump to draw pure water to clean the total nitrogen / total phosphorus digestion chamber and complete the total nitrogen blank test; After the permanganate index digestion chamber completes the permanganate colorimetric determination, the waste liquid is pumped out by the first peristaltic pump and discharged into the waste liquid outlet of the second multi-way valve. The first peristaltic pump draws pure water to clean the ammonia nitrogen digestion chamber and completes the permanganate blank test. The waste liquid after cleaning is drawn again by the second peristaltic pump and discharged into the waste liquid section of the second multi-way valve. Step 5: After the ammonia nitrogen digestion chamber completes the total phosphorus test, waste liquid is discharged through the waste liquid peristaltic pump. Pure water is drawn through the first peristaltic pump and discharged through the waste liquid peristaltic pump. The chemical detection module process ends.

6. The application of the integrated flow path miniature multi-parameter online water quality monitoring system according to any one of claims 1-4 as a chemical detection module of a miniature outdoor water quality monitoring station.

7. The application of the integrated flow path small-scale multi-parameter online water quality monitoring system as described in claim 6, characterized in that: The small outdoor water quality monitoring station includes a chassis, a pre-water circuit, a water distribution unit, a detection module, a data acquisition and transmission unit, and a control unit. The pre-water circuit collects water samples from the water body to be monitored for analysis. The water distribution unit distributes the water samples collected by the pre-water circuit to the detection module for analysis. The detection module includes a chemical detection module and a conventional five-parameter detection pool. The data acquisition and transmission unit collects and processes the output signals of the detection module in a predetermined manner and transmits the detection data and operating parameters to the host computer. The control unit includes a touch screen and a microcontroller control system. The touch screen displays various detection parameters in real time, and the detection is operated by the microcontroller control system. The chassis is arranged in layers, with the pre-water circuit at the bottom layer. The conventional five-parameter detection pool and the chemical detection module are arranged sequentially on the pre-water circuit. The pre-water circuit provides water samples to the five-parameter detection pool and the chemical detection module through the water distribution unit and the layers respectively.

8. The application of the integrated flow path small-scale multi-parameter online water quality monitoring system as described in claim 7, characterized in that: The pre-water circuit includes a water intake pump and a water intake pipeline. The water intake pipeline is connected to the water distribution unit to inject, drain, and clean water samples from the five-parameter detection pool and the chemical detection module.

9. The application of the integrated flow path small-scale multi-parameter online water quality monitoring system as described in claim 7, characterized in that: The chassis is equipped with an air conditioner to regulate the internal ambient temperature, and the air conditioner's exhaust vent is located through the side wall of the chassis.

10. The application of the integrated flow path small-scale multi-parameter online water quality monitoring system as described in claim 7, characterized in that: A touch screen is installed on the top of the front cover of the chassis. The touch screen is connected to a microcontroller control system via a circuit. The microcontroller control system is located on the top layer of the chassis.

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