Rainfall on-line monitoring system

Abstract

The rainfall on-line monitoring system comprises a rainwater collection module, a detection module, an ion chromatographic analysis module and a waste discharge pipeline, the ion chromatographic analysis module comprises an ion chromatographic analysis device and a multi-stage purification device, and the multi-stage purification device is connected between a circulation tank and the ion chromatographic analysis device; the multi-stage purification device comprises at least two stages of filtering devices which are sequentially connected, each stage of filtering device comprises a sedimentation tank and a filter, and the filter extends into the sedimentation tank and is used for filtering rainwater flowing to the next stage of filtering device or the ion chromatographic analysis device; the waste discharge pipeline is respectively connected with the conductivity detection device, the PH detection device, the multi-stage purification device and the ion chromatographic analysis device. According to the rainfall online monitoring system disclosed by the embodiment of the invention, high-precision detection on a sample can be realized, the filter membrane can be prevented from being blocked, the service life is prolonged, and the pretreatment time before an ion chromatographic analysis device is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental monitoring, and in particular to an online precipitation monitoring system. Background Art

[0002] Precipitation monitoring is an important task in my country's environmental protection work. With the development of my country's automation technology and analytical detection technology, precipitation monitoring has gone through three stages: manual sampling monitoring, automatic sampling manual monitoring, and online monitoring. At present, the composition of the domestic precipitation detection system is relatively simple. The usual method is to complete the detection of rainwater samples by extracting rainwater from the rain funnel through a sample extraction pump and transporting it to the detection device; however, the rainwater may contain impurities, which will affect subsequent detection, such as easy clogging and affecting the normal detection of rainwater and the normal operation time and service life of the monitoring system. Summary of the invention

[0003] The purpose of the present invention includes, for example, providing an online precipitation monitoring system that can achieve high-precision detection of samples, prevent filter membrane clogging, extend service life, and reduce pretreatment time before ion chromatography analysis.

[0004] Therefore, according to the precipitation online monitoring system of the embodiment of the present invention, by setting up a multi-stage purification device, it is possible to improve the filtering effect and pretreatment time of the sample flowing to the ion chromatography analysis device, and there is no need to frequently replace and repair the filtering device, which can increase the working time and service life of the precipitation online monitoring system.

[0005] The present invention can be implemented like this: The present invention discloses an online precipitation monitoring system, comprising: a rainwater collection module, comprising a funnel, a flow slot and a sample collection device connected in sequence, wherein the funnel is used to receive rainwater, and the sample collection device is connected to the funnel through the flow slot to collect sampled rainwater; a detection module, comprising a conductivity detection device and a PH detection device, wherein the flow slot, the conductivity detection device and the PH detection device are connected in sequence; An ion chromatography analysis module comprises an ion chromatography analysis device and a multi-stage purification device, wherein the multi-stage purification device is connected between the circulation tank and the ion chromatography analysis device, and the multi-stage purification device comprises at least two stages of filtering devices connected in sequence, wherein each stage of the filtering device comprises a sedimentation tank and a filter, and the filter extends into the sedimentation tank to filter rainwater flowing to the filtering device or the ion chromatography analysis device of the next stage; and a waste discharge pipeline, wherein the waste discharge pipeline is respectively connected to the conductivity detection device, the pH detection device, the multi-stage purification device and the ion chromatography analysis device.

[0006] According to some embodiments of the present invention, the multi-stage purification device includes a first filtering device and a second filtering device, the first filtering device includes a first sedimentation tank and a first filter, the second filtering device includes a second sedimentation tank and a second filter, the first sedimentation tank is connected to the circulation channel, the first filter extends into the first sedimentation tank and is connected to the second sedimentation tank, and the second filter extends into the second sedimentation tank and is connected to the ion chromatography analysis device.

[0007] According to some embodiments of the present invention, each stage of the filtration device also includes an overflow pipe and an overflow liquid level sensor, one end of the overflow pipe is connected to the upper part of the sedimentation tank and the other end is connected to the waste discharge pipe, and the overflow liquid level sensor is arranged on the filter overflow pipe to detect the overflow signal of the sedimentation tank to control the rainwater delivery of the sedimentation tank.

[0008] According to some embodiments of the present invention, the precipitation online monitoring system further includes an ultrafiltration device, and the ultrafiltration device is disposed between the multi-stage purification device and the ion chromatography analysis device.

[0009] According to some embodiments of the present invention, the filtration device also includes a waste liquid pipeline connected to the bottom of the sedimentation tank, the waste liquid pipeline of the last stage of the filtration device is connected to the ultrafiltration device, and the waste liquid pipelines of the remaining filtration devices are connected to the waste discharge pipeline.

[0010] According to some embodiments of the present invention, the precipitation online monitoring system further includes: a conductivity calibration device for conductivity calibration, the conductivity calibration device including a first standard pump and a first standard liquid barrel, the first standard pump being used to pump the first standard liquid in the first standard liquid barrel to the conductivity detection device; A PH calibration device for PH calibration, the PH calibration device comprising at least one set of a second standard pump and a second standard liquid barrel, the second standard pump being used to pump the second standard liquid in the second standard liquid barrel to the PH detection device.

[0011] According to some embodiments of the present invention, the precipitation online monitoring system further includes a PH protection device, which includes a protection barrel for storing protection liquid and a maintenance pump for extracting the protection liquid.

[0012] According to some embodiments of the present invention, the precipitation online monitoring system further includes a cleaning device and a gas purge device, and both the cleaning device and the gas purge device are connected to the circulation slot.

[0013] According to some embodiments of the present invention, the cleaning device is further connected between any adjacent filtering devices.

[0014] According to some embodiments of the present invention, the ion chromatography analysis module further includes a sample pool, the ultrafiltration device is connected to the sample pool, and is connected to the ion chromatography analysis device via the sample pool.

[0015] According to some embodiments of the present invention, the sample collection and retention device includes a plurality of sample retention barrels, each of which is connected to the flow channel, and each of which is used to collect and retain rainwater for a corresponding period of time.

[0016] According to some embodiments of the present invention, the online precipitation monitoring system further includes a refrigerated box, and the plurality of sample barrels are placed in the refrigerated box.

[0017] According to some embodiments of the present invention, a solenoid valve is provided between the circulation channel and each of the sample retaining barrels.

[0018] According to some embodiments of the present invention, solenoid valves are provided between the circulation channel and the sample collecting and retaining device, and between the funnel and the circulation channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic diagram of the structure of an online precipitation monitoring system according to an embodiment of the present invention; Figure 2 It is a structural schematic diagram of an automatic negative ion sampling component of an online precipitation monitoring system according to an embodiment of the present invention; Figure 3 It is a structural schematic diagram of an anion chromatography analysis component of an online precipitation monitoring system according to an embodiment of the present invention; Figure 4 It is a structural schematic diagram of an anion eluent generator component of a precipitation online monitoring system according to an embodiment of the present invention; Reference numerals: 1000: precipitation online monitoring system, 100: waste pipe; 1: funnel; 2: solenoid valve between funnel and circulation slot; 3: solenoid valve between air pump and circulation slot; 4: air pump; 5: circulation slot; 6: solenoid valve between sample collection device and circulation slot; 7: solenoid valve between circulation slot and three-way valve; 8: sample collection device, 81: sample barrel, 82: solenoid valve upstream of the inlet corresponding to each sample barrel; 9: pure water pump of cleaning device; 10: sample pump between circulation slot and detection module; 11: three-way valve; 12: maintenance pump; 13: first standard liquid barrel; 14: first standard pump; 15: conductivity detection device; 16: pinch valve of waste liquid pipeline of conductivity detection device; 17: protection barrel; 18: overflow level sensor of PH detection device; 19: pinch valve of waste liquid pipeline of PH detection device; 20: PH detection device; 21: second standard pump; 22: second standard liquid barrel; 27: solenoid valve on waste liquid pipeline of first filter device; 28: first sedimentation tank; 29: first filter; 30: first filter device Overflow level sensor of the sample pool; 31: sample pump between adjacent filter devices; 32: online filter; 33: solenoid valve between adjacent filter devices; 34: pure water pump between the pure water bucket and the second filter device; 35: pure water bucket; 36: double-head sample pump; 37: ultrafiltration device; 38: overflow level sensor of the sample pool; 39: sample pool; 40: anion automatic sampling component; 41: anion chromatography analysis component; 42: anion eluent generator component; 43: nitrogen bottle; 44: cation eluent generator 45: cation chromatography analysis component; 46: cation automatic injection component; 47: overflow level sensor of the second filter device; 48: solenoid valve of the waste liquid pipeline of the second filter device; 49: second filter; 50: second sedimentation tank; 401: ten-hole injection distribution pump; 402: anion standard sample bottle; 403: quality control sample bottle; 411: six-way valve; 412: detection component, 421: anion eluent generator; 422: high-pressure infusion pump; 423: pure water bucket of anion eluent generator component. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0024] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0026] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0027] The following describes a precipitation online monitoring system 1000 according to an embodiment of the present invention with reference to the accompanying drawings. Figure 1-Figure 4 As shown, the precipitation online monitoring system 1000 according to an embodiment of the present invention may include a rainwater collection module, a detection module, an ion chromatography analysis module and a waste discharge pipeline 100 .

[0028] Specifically, the rainwater collection module includes a funnel 1, a flow slot 5 and a sample collection device 8 connected in sequence. The funnel 1 is used to receive rainwater. The sample collection device 8 is connected to the funnel 1 through the flow slot 5 to collect sample rainwater. In this way, the rainwater received by the funnel 1 can flow through the flow slot 5 to the sample collection device 8 for sample storage. Figure 1 As shown, a solenoid valve 2 is provided between the funnel 1 and the circulation groove 5, and a solenoid valve 6 is provided between the circulation groove 5 and the sample collecting and retaining device 8. The solenoid valve can control the circulation of the sample (i.e., rainwater) between the funnel 1, the circulation groove 5, and the sample collecting and retaining device 8.

[0029] The detection module includes a conductivity detection device 15 and a PH detection device 20. The circulation slot 5, the conductivity detection device 15 and the PH detection device 20 are connected in sequence, that is, the conductivity detection device 15 is connected to the sample collection device 8 through the circulation slot 5, so that the sample can flow to the conductivity detection device 15 and the PH detection device 20 through the circulation slot 5. The conductivity detection device 15 is used to perform conductivity detection on the rainwater sample, and the PH detection device 20 is used to perform PH detection on the sample. The precipitation online monitoring system 1000 also includes a controller. The conductivity detection device 15 and the PH detection device 20 are both connected to the controller, and the detection data can be transmitted to the controller. It should be noted that the rainwater entering the conductivity detection device 15 and the PH detection device 20 does not need to be filtered.

[0030] like Figure 1 As shown, the precipitation online monitoring system 1000 also includes a sample pump 10. The sample pump 10 and the electromagnetic valve 3 are arranged between the circulation slot 5 and the detection module. The sample pump 10 can pump the sample from the sample collection device 8 through the electromagnetic valve 6 and the circulation slot 5 to the detection module for detection. The conductivity detection device 15 and the pH detection device 20 are connected, and the sample is transported to the pH detection device 20 through the conductivity detection device 15. The structure is simple and the connection is convenient.

[0031] The ion chromatography analysis module includes an ion chromatography analysis device and a multi-stage purification device. The ion chromatography analysis device is used to perform ion chromatography analysis on samples. The multi-stage purification device is connected between the circulation slot 5 and the ion chromatography analysis device. The multi-stage purification device can perform multi-stage pre-purification filtration on the sample flowing to the ion chromatography analysis device, thereby improving the filtration effect of the sample entering the ion chromatography analysis device.

[0032] It is understandable that based on the high-precision requirements of the ion chromatography analysis device for the detection samples, the samples need to be filtered with high precision before ion chromatography analysis. For example, 0.45μm filter membrane can be used for filtration. Direct filtration with a filter membrane with high filtration accuracy is prone to blockage, resulting in a short life of the filter membrane, which requires frequent replacement and also affects the time for rainwater samples to enter the ion chromatography analysis device. The present invention adopts a multi-stage purification device, which can perform multiple filtrations. Compared with directly using a high-filtration accuracy filter membrane, it can not only ensure the filtration effect, but also reduce the frequency of maintenance and replacement, and reduce the pretreatment time of rainwater samples before entering the ion chromatography analysis device.

[0033] Specifically, in an embodiment of the present invention, the multi-stage purification device includes at least two stages of filtering devices connected in sequence, that is, the multi-stage purification device may include two stages of filtering devices or more than two stages of filtering devices, at least two stages of filtering devices are connected in series, and the sample flows through at least two stages of filtering devices in sequence and then flows to the downstream ion chromatography analysis device.

[0034] Each stage of filtration includes a sedimentation tank (e.g. Figure 1 The first sedimentation tank 28 and the second sedimentation tank 50 shown in FIG. Figure 1 As shown in the figure, the first filter 29 and the second filter 49 are extended into the sedimentation tank to filter the sample flowing to the next filtering device or ion chromatography analysis device. In this way, the sample can first be allowed to stand and settle in the sedimentation tank to pre-treat the rainwater sample. The sample after standing and settling is filtered through the filter and then enters the next filtering device or ion chromatography analysis device. In this way, each filtering device can settle and filter the rainwater sample, which not only improves the filtering effect but also reduces the clogging and damage to the filter. Finally, the rainwater sample flows to the ion chromatography analysis device after multi-stage filtration, which can also reduce unnecessary pretreatment time. The filter of each filtering device does not need to be set with a high filtering accuracy, which can also reduce costs and reduce damage and maintenance of the filter.

[0035] The waste discharge pipeline 100 is respectively connected to the conductivity detection device 15, the pH detection device 20, the multi-stage purification device and the ion chromatography analysis device. The samples detected by the conductivity detection device 15, the pH detection device 20, the multi-stage purification device and the ion chromatography analysis device and the remaining samples settled at the bottom of the sedimentation tank can be discharged to the waste discharge pipeline 100.

[0036] Therefore, according to the precipitation online monitoring system 1000 of the embodiment of the present invention, by setting up a multi-stage purification device, it is possible to improve the filtering effect and pretreatment time of the water flowing to the ion chromatography analysis device, and there is no need to frequently replace and repair the filtering device, which can increase the working time and service life of the precipitation online monitoring system 1000.

[0037] like Figure 1 As shown, the multi-stage purification device may include a first filtering device and a second filtering device, the first filtering device includes a first sedimentation tank 28 and a first filter 29, the second filtering device includes a second sedimentation tank 50 and a second filter 49, the first sedimentation tank 28 is connected to the flow slot 5, the first filter 29 extends into the first sedimentation tank 28 and is connected to the second sedimentation tank 50, and the second filter 49 extends into the second sedimentation tank 50 and is connected to the ion chromatography analyzer. In this way, the sample enters the first sedimentation tank 28 and is allowed to settle. After the settling, the sample flows to the second sedimentation tank 50 through the first filter 29, and is allowed to settle in the second sedimentation tank 50. After the settling, the sample flows to the ion chromatography analyzer. Through two sets of settling and filtering, the filtering effect can be improved, and the damage to the filter can be reduced, thereby increasing the service life.

[0038] It should be noted that the filtering accuracy of each stage of the filter may be different. For example, in the flow direction of the sample, the filtering accuracy of the multi-stage filter gradually increases, thereby improving the filtering effect and reducing the filtering burden of each stage of the filter to ensure its service life.

[0039] Furthermore, if Figure 1 As shown, a sample pump 31, an online filter 32 and a solenoid valve 33 are provided in sequence between the first filter device and the second filter device, wherein the sample pump 31 is used to provide power for the flow of the sample, the online filter 32 is used to further filter the rainwater sample flowing through, and the solenoid valve 33 is used to control the circulation of the sample.

[0040] like Figure 1 As shown, each stage of the filtration device also includes an overflow pipe and an overflow liquid level sensor (such as Figure 1 As shown in the overflow liquid level sensor 30 and the overflow liquid level sensor 47, one end of the overflow pipe is connected to the upper part of the sedimentation tank and the other end is connected to the waste discharge pipeline 100. The overflow liquid level sensor is arranged on the overflow pipe to detect the overflow signal of the sedimentation tank. Therefore, after the sample enters the sedimentation tank, the excess sample can be discharged to the waste discharge pipeline 100 through the overflow pipe. The overflow liquid level sensor is arranged on the filter overflow pipe. When the sample flows through the overflow pipe, the overflow liquid level sensor can detect the overflow signal, which can reflect the amount of rainwater sample in the sedimentation tank. For example, the rainwater sample has filled the sedimentation tank. At this time, the rainwater sample can be stopped from being transported to the sedimentation tank, for example, the upstream sample pump is closed.

[0041] The precipitation online monitoring system 1000 of the embodiment of the present invention further includes an ultrafiltration device 37, which is disposed between the multi-stage purification device and the ion chromatography analysis device, and further filtration can be performed through the ultrafiltration device 37. Figure 1 As shown, the filter device also includes a waste liquid pipeline connected to the bottom of the sedimentation tank, through which the remaining rainwater samples in the sedimentation tank can be emptied. The waste liquid pipeline of the last filter device is connected to the ultrafiltration device 37, and the waste liquid pipelines of the remaining filter devices are connected to the waste discharge pipeline 100, so that the excess rainwater samples after precipitation of the multi-stage purification device located upstream can be discharged through the waste liquid pipeline, and the samples at the bottom of the sedimentation tank of the last filter device can flow to the ultrafiltration device 37. Since the rainwater samples have been filtered by the filter of the upstream filter device, the rainwater samples in the last filter device are relatively clean, and the bottom samples after static sedimentation can also be filtered by the ultrafiltration device 37 and flow to the ion chromatography analysis device, thereby providing more samples for ion chromatography analysis.

[0042] In some embodiments of the present invention, the precipitation online monitoring system 1000 of the embodiment of the present invention also includes a conductivity calibration device for conductivity calibration and a pH calibration device for pH calibration, thereby realizing conductivity calibration and pH calibration and improving detection accuracy.

[0043] The conductivity calibration device includes a first standard pump 14 and a first standard liquid barrel 13, and the first standard pump 14 is used to pump the first standard liquid in the first standard liquid barrel 13 to the conductivity detection device 15; the pH calibration device includes at least one set of second standard pumps 21 and second standard liquid barrels 22, and the second standard pump 21 is used to pump the second standard liquid in the second standard liquid barrel 22 to the pH detection device 20. Figure 1 As shown, the pH calibration device may include three sets of second standard pumps 21 and second standard liquid barrels 22. The three second standard liquid barrels 22 store different standard liquids respectively. For example, the three second standard liquid barrels 22 store PH4 standard liquid, PH7 standard liquid and PH9 standard liquid respectively.

[0044] like Figure 1 As shown, the precipitation online monitoring system 1000 of the embodiment of the present invention also includes a PH protection device, which includes a protection barrel 17 for storing protection liquid and a maintenance pump 12 for extracting the protection liquid. Specifically, when the maintenance pump 12 is turned on, the protection liquid in the protection barrel 17 can be extracted to the PH detection device 20. When the protection liquid reaches a preset value or a preset position of the PH detection device 20, the maintenance pump 12 is turned off.

[0045] In such Figure 1 In the example shown, the pH detection device 20 also includes a pH overflow pipe and an overflow liquid level sensor 18 arranged on the pH overflow pipe. When the liquid in the pH detection device 20 (such as rainwater sample and protective liquid, standard liquid) reaches a certain position or amount, it can flow from the pH overflow pipe to the waste pipe 100. At the same time, the overflow liquid level sensor 18 can detect the overflow signal, thereby controlling the liquid to stop delivering liquid to the pH detection device 20, such as controlling the sample pump 10 and the maintenance pump 12 to shut down.

[0046] In some embodiments of the present invention, the online precipitation monitoring system 1000 also includes a cleaning device and a gas purge device, both of which are connected to the circulation slot 5. The cleaning device is used to clean the rainwater collection module, the detection module, the ion chromatography analysis module and the connecting pipes therebetween, and the gas purge device is used to purge the rainwater collection module, the detection module, the ion chromatography analysis module and the connecting pipes therebetween.

[0047] like Figure 1As shown, the cleaning device may include a pure water barrel 35 for storing pure water for cleaning and a pure water pump 9, the pure water pump 9 is connected between the circulation slot 5 and the pure water barrel 35, so that the pure water in the pure water barrel 35 can flow to the detection module and the ion chromatography analysis module through the circulation slot 5, and the flow path of the pure water can be the same as the flow path of the rainwater sample, thereby improving the cleaning effect; the gas purging device may include an air pump 4 and a solenoid valve 3, the air pump 4 is connected to the circulation slot 5, and the solenoid valve 3 is connected between the air pump 4 and the circulation slot 5, so that the gas purging path can be the same as the flow path of the rainwater sample, thereby ensuring the purging effect.

[0048] like Figure 1 As shown, a solenoid valve 7 and a three-way valve 11 are also provided between the circulation slot 5 and the detection module and the ion chromatography analysis module. The solenoid valve 7 is arranged in parallel with the sample pump 10. When cleaning and purging are performed, the solenoid valve 7 is opened and the sample pump 1 is closed. When testing is performed, the sample pump 10 is opened and the solenoid valve 7 is closed. The three-way valve 11 can switchably connect the multi-stage purification device and the detection module.

[0049] Furthermore, the cleaning device is also connected between any adjacent filtering devices, for example Figure 1 As shown, the cleaning device can be connected between the first filter device and the second filter device, so that each stage of the filter device can be cleaned separately by the cleaning device, and the cleaning effect of each stage of the filter device can be guaranteed.

[0050] like Figure 1 As shown, the ion chromatography analysis module includes a sample pool 39, an ultrafiltration device 37 is connected to the sample pool 39, and the sample pool 39 is connected to the ion chromatography analysis device. Figure 1 In the example shown, the precipitation online monitoring system 1000 also includes a double-head sample pump 36, and the second filtering device is connected to the ultrafiltration device 37 and the sample pool 39 through the double-head sample pump 36. The sample filtered by the second filter 49 flows to the ultrafiltration device 37 through the double-head sample pump 36, and flows to the sample pool 39 after being filtered by the ultrafiltration device 37. When the sample pool 39 is full, the sample overflowing from the sample pool 39, the impurities filtered by the ultrafiltration device 37, and the lower sedimentation sample of the second sedimentation tank 50 can all flow to the waste pipe 100, thereby, the rainwater sample after multiple filtration by the multi-stage purification device and the ultrafiltration device 37 can be stored in the sample pool 39, and the sample pool 39 can be formed as a sample source for the ion chromatography analysis device.

[0051] In some examples, the ion chromatography analysis device includes an anion chromatography analysis device and a cation chromatography analysis device both connected to the sample pool 39, that is, the sample in the sample pool 39 can flow to the anion chromatography analysis device and the cation chromatography analysis device respectively, thereby realizing chromatographic analysis detection of anions and cations.

[0052] like Figure 1As shown, the anion chromatography analysis device includes an anion automatic sampling component 40, an anion chromatography analysis component 41 and an anion eluent generator component 42; the cation chromatography analysis device includes a cation automatic sampling component 46, a cation chromatography analysis component 45 and a cation eluent generator component 44.

[0053] Among them, Figure 1 and Figure 2 As shown, the anion automatic injection assembly 41 includes a ten-hole injection dispensing pump 401, a plurality of anion standard sample bottles 402, a quality control sample bottle 403 and a pure water bucket; Figure 3 As shown, the anion chromatography analysis component 41 includes a six-way valve 411 and a detection component 412, and the detection component 412 may include an analysis column, a suppressor, and a conductivity cell. Figure 4 As shown, the anion eluent generator assembly 42 includes an anion eluent generator 421, a high pressure infusion pump 422 and a pure water bucket 423. It can be understood that the cation automatic injection assembly 46, the cation chromatography analysis assembly 45 and the cation eluent generator assembly 44 can be the same as the anion chromatography analysis device described above.

[0054] In addition, precipitation monitoring systems in related technologies generally use a sample barrel, which can only store and test one sample, or require manual removal of standard samples for testing, and the sample barrel has no anti-deterioration measures, which can easily affect the test results. In some examples of the present invention, the sample collection and retention device 8 of the precipitation online monitoring system 1000 may include multiple sample barrels 81, each sample barrel 81 is connected to the circulation slot 5, and each sample barrel 81 is used to collect and retain rainwater on a corresponding date. Multiple sample barrels 81 can be used to store and collect rainwater at multiple times, so that when testing is required, the rainwater detection at the corresponding time can be achieved by extracting the rainwater sample in the corresponding sample barrel 81. Figure 1 As shown, there are eight sample barrels 81, and the eight sample barrels 81 can collect and store rainwater samples of eight time periods.

[0055] It can be understood that each sample bucket 81 can store rainwater samples corresponding to a certain day, multiple sample buckets 81 correspond to rainwater samples for multiple days, or each sample bucket 81 can correspond to rainwater samples for a certain time period of a day. The corresponding time for each sample bucket 81 can be selected and set as needed.

[0056] Therefore, by setting up multiple sample barrels 81, the multiple sample barrels 81 are set up separately, not only can multiple rainwater samples be preserved and retained, which is convenient for subsequent analysis and testing of rainwater samples, but also detection and analysis and retention of rainwater samples can be carried out as needed, with a high degree of automation, no need to rely on manual operation, and a small workload.

[0057] Optionally, the precipitation online monitoring system 1000 further includes a refrigerated box, and a plurality of sample barrels 81 are placed in the refrigerated box, so as to better realize the storage of rainwater samples, prevent the samples from deteriorating, and ensure the accuracy of subsequent measurement results.

[0058] like Figure 1 As shown, a solenoid valve 82 is provided between the circulation slot 5 and each sample barrel 81. The solenoid valve 82 can control the transportation of sample rainwater between the circulation slot 5 and the sample barrel 81. By opening and closing a plurality of solenoid valves 82, the corresponding rainwater samples are stored in the corresponding sample barrel 81. At the same time, when the corresponding sample is tested, the corresponding sample barrel 81 and the solenoid valve 82 can be opened, which is easy to operate, improves the degree of automation, and can also avoid sample confusion.

[0059] Combine the following Figure 1 The working principle and process of an online precipitation monitoring system 1000 according to a specific example of the present invention are described.

[0060] Rainwater sample collection: After the rain, the rain funnel 1 collects rainwater, the solenoid valve 2 and the solenoid valve 6 are opened, the solenoid valve 3 and the solenoid valve 7 are closed, and the collecting and retaining sample device 8 opens the corresponding solenoid valve 82 according to the rainfall date, and the rainwater is collected in the corresponding retaining sample barrel 81. The collecting and retaining sample device 8 is integrated in the refrigerator, and there are 8 sample barrels 81 in total, which can complete 8 days of precipitation collection.

[0061] PH and conductivity measurement: If it rained the day before, the measurement can be started at 9 o'clock the next day. Solenoid valve 2, solenoid valve 3, and solenoid valve 7 are closed, and the sample barrel 81 and solenoid valve 82 corresponding to the previous day in the solenoid valve 6 and the sample collection device 8 are opened. The sample pump 10 is running, and the two-position three-way solenoid valve 11 is switched to connect the conductivity detection device 15. Rainwater enters the flow slot 5 from the sample barrel 81 through the solenoid valve 6, enters the conductivity detection device 15 through the sample pump 10 and the two-position three-way solenoid valve 11, and enters the PH detection device 20 through the branch. When the sample is discharged from the overflow port and passes through the overflow liquid level sensor 18, the sample pump 10 stops working. The conductivity detection device 15 and the PH detection device 20 upload the values ​​to the industrial computer (not shown). After the measurement is completed, the pinch valve 16 and the pinch valve 19 are opened to discharge the sample into the waste pipe 100.

[0062] PH and conductivity detection device cleaning: solenoid valve 2, solenoid valve 3, and solenoid valve 6 are closed, the two-position three-way solenoid valve 11 is switched to connect the conductivity detection device 15, and the solenoid valve 7 and pure water pump 9 are turned on. Pure water is sucked into the circulation slot 5, enters the conductivity detection device 15 through the solenoid valve 7 and the two-position three-way solenoid valve 11, and enters the PH detection device 20 through the branch. When the pure water is left from the overflow port and passes through the overflow liquid level sensor 18, the pure water pump 9 stops working, the pinch valve 16 and the pinch valve 19 are opened, and the pure water is discharged into the waste pipe 100. The solenoid valve 3 and the air pump 4 are turned on, and the gas purges the entire pipeline for a certain period of time, for example, 10 seconds, and then the solenoid valve 3, the air pump 4, the pinch valve 16 and the pinch valve 19 are closed.

[0063] PH calibration: First, clean the PH detection device 20 and the conductivity detection device 15 according to the above cleaning steps. The second standard pump 21 is turned on to suck the liquid in the second standard liquid barrel 22 into the PH detection device 20. When the second standard liquid flows out from the overflow port and passes through the overflow liquid level sensor 18, the second standard pump 21 is turned off, and the pinch valve 19 is opened to discharge the second standard liquid and then closed. This is a rinse. The second standard pump 21 is turned on again to suck the liquid in the second standard liquid barrel 22 into the PH detection device 20. When the second standard liquid flows out from the overflow port and passes through the overflow liquid level sensor 18, the second standard pump 21 is turned off, and the system calibrates the PH value. After calibration, the pinch valve 19 is opened to discharge the standard liquid and then closed.

[0064] It should be noted that there are multiple types of second standard solutions, and calibration of multiple pH values ​​can be performed according to the above steps. For example, the second standard solution can include PH7, PH9 and PH4 calibration solutions. When calibrating, the calibration can be performed in the order of PH4, PH7, PH9 according to the above steps.

[0065] Conductivity calibration: Similar to pH calibration, the first standard pump 14 is turned on to suck the liquid in the first standard liquid barrel 13 into the conductivity detection device 15. When the first standard liquid flows out from the overflow port and passes through the overflow liquid level sensor 18, the first standard pump 14 is turned off, and the pinch valve 16 and the pinch valve 19 are opened to discharge the first standard liquid and then closed. This is a rinse. The first standard pump 14 is turned on again to suck the liquid in the first standard liquid barrel 13 into the conductivity detection device 15. When the first standard liquid flows out from the overflow port and passes through the overflow liquid level sensor 18, the first standard pump 14 is turned off, and the system calibrates the conductivity value. After calibration, the pinch valve 16 and the pinch valve 19 are opened to discharge the first standard liquid and then closed.

[0066] Passing protection liquid: the maintenance pump 12 is turned on to draw the liquid in the protection liquid barrel 17 to the PH detection device 20. When the protection liquid flows out from the overflow port and passes through the overflow liquid level sensor 18, the maintenance pump 12 is turned off.

[0067] Sampling in the ion chromatography analyzer: solenoid valve 6 is opened, the corresponding sample barrel 81 and solenoid valve 82 in the sample collection device 8 are opened, solenoid valve 2, solenoid valve 3, and solenoid valve 7 are closed, the two-position three-way solenoid valve 11 is switched to connect the multi-stage purification device, and the sample pump 10 is opened. The sample is drawn from the sample collection device 8 into the multi-stage purification device. When the overflow level sensor 30 detects the overflow signal, the sample pump 10, the solenoid valve 6, the corresponding sample barrel 81 and solenoid valve 82 in the sample collection device 8 are closed. After standing for 1 hour, the sample pump 31 and the solenoid valve 33 are opened, and the sample after standing and settling enters the second sedimentation tank 50 through the filter 29 and the online filter 32. When the overflow level sensor 47 detects the overflow signal, the sample pump 31 is closed, the solenoid valve 27 is opened, and the solenoid valve 27 is closed after the remaining sample in the sedimentation tank is emptied. After the sedimentation tank 50 is left to stand for 1 hour, the double-head sample pump 36 is turned on, and the sample enters the sample tank 39 through the filter 49 and the ultrafiltration device 37. When the overflow level sensor 38 detects a signal, the double-head sample pump 36 is turned off, the solenoid valve 48 is turned on, and the solenoid valve 48 is closed after the remaining sample in the sedimentation tank 50 is emptied. The anion automatic injection component 40 and the cation automatic injection component 46 start working, extracting the sample from the sample tank 39 and injecting it into the anion chromatography analysis component 41 and the cation chromatography analysis component 45 for analysis.

[0068] Ion chromatography flow path cleaning stage 1: solenoid valve 2, solenoid valve 3, and solenoid valve 6 are closed, solenoid valve 7 is opened, the two-position three-way solenoid valve 11 is switched to connect to the first sedimentation tank 28, the pure water pump 9 is turned on, and pure water flows into the first sedimentation tank 28 through the circulation slot 5, solenoid valve 7, and the two-position three-way solenoid valve 11. When the overflow liquid level sensor 30 detects a signal, the pure water pump 9 is closed, and the solenoid valve 3, solenoid valve 27, and air pump 4 are opened to empty the sedimentation tank and clean the pipeline. After the set time is reached, the solenoid valve 3, solenoid valve 27, and air pump 4 are closed.

[0069] Chromatographic flow path cleaning stage two: the pure water pump 9 is turned on, and the pure water enters the first sedimentation tank 28 again. When the overflow liquid level sensor 30 detects a signal, the pure water pump 9 is turned off, the sample pump 31, the solenoid valve 33, and the solenoid valve 48 are opened, and the sample enters the second sedimentation tank 50 through the first filter 29 and the online filter 32 to clean the pipeline between the first sedimentation tank 28 and the second sedimentation tank 50. After the set time is reached, the solenoid valve 27 is opened, and the sample pump 31, the solenoid valve 33, and the solenoid valve 48 are closed.

[0070] Phase III of chromatographic flow path cleaning: pure water pump 34 is turned on. When the liquid level sensor 47 detects a signal, pure water pump 34 is turned off, solenoid valve 48 is turned on, pure water in the second sedimentation tank 50 is drained, and solenoid valve 48 is turned off. Pure water pump 34 is turned on again. When overflow liquid level sensor 47 detects a signal, pure water pump 34 is turned off and double-head sample pump 36 is turned on. When overflow liquid level sensor 38 detects a signal, anion automatic sampler assembly 40 and cation automatic sampler assembly 46 start working, extracting pure water from sample pool 39 through ion chromatography analysis assembly 41, 45 and draining into waste pipe 100. After reaching the set time, double-head sample pump 36 stops working, anion automatic sampler assembly 40 and cation automatic sampler assembly 46 completely drain the liquid in sample pool 39 and then stop working. At this point, all flow paths of the entire system are cleaned.

[0071] Anion chromatography calibration curve: Figure 2 As shown, the ten-hole injection dispensing pump 401 extracts standard samples from multiple anion standard sample bottles 402 in sequence according to the set time and injects them into the quantitative loop of the six-way valve 411 of the anion chromatography analysis component 41 through 7 ports to complete the calibration injection.

[0072] The calibration for cation chromatography is the same as that for anion chromatography.

[0073] The quality control sampling is similar to the chromatography calibration method. The ten-hole injection dispensing pump 401 extracts the quality control sample from the quality control sample bottle 407 and injects it into the ion chromatography analysis component according to the set time.

[0074] Cleaning of the anion chromatography analysis component 41: The ten-hole injection dispensing pump 401 draws pure water from the pure water barrel 408 and discharges it into the waste pipe 100 from the 7th port through the anion chromatography analysis component 41, completing the cleaning of the injection barrel and the injection pipe.

[0075] The cleaning method of the cation chromatograph 45 is the same as the cleaning method of the anion chromatograph 41 .

[0076] like Figure 2 The syringe pump in the anion automatic sampler assembly 40 shown is placed forward. When the syringe pump draws samples, the remaining air will be concentrated in the upper part of the syringe barrel. When injecting samples, the syringe pump is fully pushed to the stroke limit, so that the gas can be discharged into the pipeline first and the rest is filled with liquid. This method ensures that there are no bubbles in the sample filled in the quantitative loop, which can make the ion chromatography analysis results more accurate.

[0077] like Figure 4 In the anion eluent generator assembly 42 of the present invention, a pipeline is provided in the pure water barrel 423 to connect to the gas cylinder 43, and nitrogen is stored in the gas cylinder 43. This solution can ensure that there is no pollution of carbon dioxide in the air in the pure water barrel 423, and can extend the shelf life of pure water, extend the pure water replacement time, make the ion chromatography detection results more accurate, and save labor costs.

[0078] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A precipitation online monitoring system, characterized in that: include: A rainwater collection module comprises a funnel, a flow slot and a sample collection device connected in sequence, wherein the funnel is used to receive rainwater, and the sample collection device is connected to the funnel through the flow slot to collect sample rainwater; A detection module, comprising a conductivity detection device and a pH detection device, wherein the flow slot, the conductivity detection device and the pH detection device are connected in sequence; An ion chromatography analysis module, comprising an ion chromatography analysis device and a multi-stage purification device, wherein the multi-stage purification device is connected between the circulation tank and the ion chromatography analysis device, and the multi-stage purification device comprises at least two stages of filtering devices connected in sequence, wherein each stage of the filtering device comprises a sedimentation tank and a filter, and the filter extends into the sedimentation tank to filter rainwater flowing to the filtering device or the ion chromatography analysis device of the next stage; A waste discharge pipeline is respectively connected to the conductivity detection device, the pH detection device, the multi-stage purification device and the ion chromatography analysis device.

2. The precipitation online monitoring system according to claim 1, characterized in that: The multi-stage purification device includes a first filtering device and a second filtering device, the first filtering device includes a first sedimentation tank and a first filter, the second filtering device includes a second sedimentation tank and a second filter, the first sedimentation tank is connected to the circulation groove, the first filter extends into the first sedimentation tank and is connected to the second sedimentation tank, and the second filter extends into the second sedimentation tank and is connected to the ion chromatography analysis device.

3. The precipitation online monitoring system according to claim 1, characterized in that: Each level of the filtering device also includes an overflow pipe and an overflow liquid level sensor. One end of the overflow pipe is connected to the upper part of the sedimentation tank and the other end is connected to the waste discharge pipeline. The overflow liquid level sensor is arranged on the overflow pipe to detect the overflow signal of the sedimentation tank to control the rainwater transportation of the sedimentation tank.

4. The precipitation online monitoring system according to claim 1, characterized in that: It also includes an ultrafiltration device, which is arranged between the multi-stage purification device and the ion chromatography analysis device.

5. The precipitation online monitoring system according to claim 4, characterized in that: The filtering device also includes a waste liquid pipeline connected to the bottom of the sedimentation tank. The waste liquid pipeline of the last-stage filtering device is connected to the ultrafiltration device, and the waste liquid pipelines of the remaining filtering devices are connected to the waste discharge pipeline.

6. The precipitation online monitoring system according to claim 1, characterized in that: Also includes: A conductivity calibration device for conductivity calibration, the conductivity calibration device comprising a first standard pump and a first standard liquid barrel, the first standard pump being used to pump a first standard liquid in the first standard liquid barrel to the conductivity detection device; A PH calibration device for PH calibration, the PH calibration device comprising at least one set of a second standard pump and a second standard liquid barrel, the second standard pump being used to pump the second standard liquid in the second standard liquid barrel to the PH detection device.

7. The precipitation online monitoring system according to claim 1, characterized in that: It also includes a PH protection device, which includes a protection barrel for storing protection liquid and a maintenance pump for extracting the protection liquid.

8. The precipitation online monitoring system according to claim 1, characterized in that: It also includes a cleaning device and a gas purge device, and both the cleaning device and the gas purge device are connected to the flow slot.

9. The precipitation online monitoring system according to claim 8, characterized in that: The cleaning device is also connected between any adjacent filtering devices.

10. The precipitation online monitoring system according to claim 4, characterized in that: The ion chromatography analysis module also includes a sample pool, the ultrafiltration device is connected to the sample pool, and is connected to the ion chromatography analysis device through the sample pool.

11. The precipitation online monitoring system according to claim 1, characterized in that: The sample collection and retention device comprises a plurality of sample retention barrels, each of which is connected to the flow slot, and each of which is used to collect and retain rainwater for a corresponding period of time.

12. The precipitation online monitoring system according to claim 11, characterized in that: It also includes a refrigerated box, in which the plurality of sample barrels are placed.

13. The precipitation online monitoring system according to claim 11, characterized in that: A solenoid valve is provided between the circulation slot and each of the sample retaining barrels.

14. The precipitation online monitoring system according to claim 11, characterized in that: Solenoid valves are provided between the circulation groove and the sample collecting and retaining device, and between the funnel and the circulation groove.

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