KR102135690B1 - Waste water quality monitoring system including water treatment rtu with fine plastic detection - Google Patents

Abstract

Disclosed is an outlet water quality monitoring system capable of monitoring microplastics contained in the water quality of an outlet by analyzing microplastics in addition to analyzing the hazardous environment around the outlet. Such an outlet water quality monitoring system includes an automatic water collection unit, a microplastic detection unit, a hazardous environment detection unit, an edge computer, and an integrated monitoring system. The automatic water collection unit collects sewage to be inspected from an outlet of a sewage treatment plant. The microplastic detection unit analyzes microplastics of the sewage to be inspected by the automatic water collection unit. The harmful environment detection unit analyzes the harmful gas of the sewage to be inspected by the automatic water collection unit. The edge computer processes the analysis data received from a microplastic analysis module and a harmful gas analysis module. The integrated monitoring system receives the sewage treatment plant and the analysis result from the edge computer and analyzes and diagnoses operation information of the sewage treatment plant as a result of the analysis of the edge computer of each sewage treatment plant if at least one of the microplastic content and the harmful gas content is above the set value.

Description

WATER WATER QUALITY MONITORING SYSTEM INCLUDING WATER TREATMENT RTU WITH FINE PLASTIC DETECTION}

The present invention relates to an outlet water quality monitoring system including a water treatment RTU, and more particularly, to an outlet water quality monitoring system including a water treatment RTU having a microplastic detection function.

Water quality management is a very important issue not only for the surrounding ecosystem, but also for the human life. To this end, technologies for monitoring harmful gases and harmful substances have been developed. However, in recent years, there has been no monitoring of microplastics whose severity has been highlighted.

Due to the misuse of disposable products or micro-plastics scattered in daily life and the absence of micro-plastic management regulations in the operation of sewage treatment facilities, micro-plastics are leaking without being completely removed from wastewater and sewage treatment plants. These microplastics flow into rivers and oceans, polluting water resources (fish, etc.) ecosystems with harmful components, and serious problems that these marine food resources are returned to the human body and accumulate as toxic substances in the human body are emerging as social and international problems. As it becomes possible, a fundamental solution (measurement technology development, diagnostic technology development, integrated management technology development, etc.) is urgently required at home and abroad.

Republic of Korea Patent Publication No. 10-2017-0138297

Accordingly, the problem to be solved by the present invention is to provide an outlet water quality monitoring system capable of simultaneously detecting microplastics that have recently emerged as well as detecting harmful environments around the outlet.

A water quality monitoring system according to an exemplary embodiment of the present invention for solving this problem includes an automatic collection unit, a microplastic detection unit, a hazardous environment detection unit, an edge computer, and an integrated monitoring system. The automatic water collection unit collects sewage to be inspected at a discharge port of a sewage treatment plant. The microplastic detection unit analyzes microplastics of sewage to be inspected in the automatic collection unit. The hazardous environment detection unit analyzes the harmful gas of the sewage subject to be inspected by the automatic collection unit. The edge computer processes analysis data received from the microplastic analysis module and the harmful gas analysis module. The integrated monitoring system, when at least one of the analysis result of the edge computer of each sewage treatment plant, the microplastic content and the harmful gas content is more than a set value, receives the corresponding sewage treatment plant and analysis results from the edge computer from the edge computer, and sewage Analyze and diagnose the operation information of the treatment plant.

For example, the microplastic detection unit may include a sample pre-processing unit, a sample separation unit, an image capturing unit, and an FT-IR analysis unit. The sample pre-processing unit may remove suspended matter including plankton from sewage to be inspected collected from the automatic collection unit. The sample separating part may separate the microplastic inside the sewage to be inspected from which the suspended matter is removed by the sample preprocessing part. The image capturing unit may capture an image of the separated microplastic. The FT-IR analysis unit may analyze the components of the separated microplastic.

For example, the sample pre-processing part may include a metering part, a hydrogen peroxide mixing part, a cleaning part and a drying part. The metering unit may measure the volume of sewage to be inspected. The hydrogen peroxide mixture may mix hydrogen peroxide to the sewage to be tested. The cleaning unit may clean the microplastic of the sewage to be inspected. The drying unit may dry the washed microplastic.

In this case, the sample pre-processing unit may further include an iron sulfide mixing unit.

Meanwhile, the image photographing unit may photograph a 3D image.

For example, the sample separation unit may include a first filter unit and a second filter unit. The first filter unit may filter particles having a first size or more. The second filter unit may filter particles of a second size or more smaller than the first size.

For example, at least one of the first filter unit and the second filter unit may include a rotating plate, a filter, and a motor. The rotating plate includes at least one opening. The filter may be rotatably disposed in the opening. The motor can rotate the filter.

The outlet water quality monitoring system according to another exemplary embodiment of the present invention includes a microplastic detection unit, a hazardous environment detection unit, an edge computer, and an integrated monitoring system. The microplastic detection unit analyzes microplastics of sewage to be inspected. The hazardous environment detection unit analyzes the harmful gas of the sewage to be inspected. The edge computer processes analysis data received from the microplastic analysis module and the harmful gas analysis module. The integrated monitoring system receives the corresponding sewage treatment plant and analysis results from the edge computer from the edge computer when at least one of the analysis results of the edge computer of each sewage treatment plant, at least one of the fine plastic content and the harmful gas content is greater than a set value, the sewage treatment plant Analyze and diagnose the operation information. At this time, the microplastic detection unit includes a sample pre-processing unit, a sample separation unit, and an FT-IR analysis unit. The sample pre-processing unit removes suspended substances including plankton from the sewage to be inspected. The sample separating part separates the microplastic inside the sewage to be inspected from which the suspended matter is removed by the sample pre-processing part. The FT-IR analysis unit analyzes the components of the separated microplastic.

For example, the sample pre-processing part may include a metering part, a hydrogen peroxide mixing part, a cleaning part and a drying part. The metering unit may measure the volume of sewage to be inspected. The hydrogen peroxide mixture may mix hydrogen peroxide to the sewage to be tested. The cleaning unit may clean the microplastic of the sewage to be inspected. The drying unit may dry the washed microplastic.

For example, the microplastic detection unit may further include an image capturing unit capturing a 3D image of the separated microplastic.

As described above, the outlet water quality monitoring system according to the present invention is configured to analyze microplastics in addition to the conventional harmful gas analysis, and can monitor the microplastics included in the outlet water quality.

In addition, the discharge water quality monitoring system can improve the accuracy of the inspection by removing suspended particles having a size distribution similar to that of microplastics such as plant and animal plankton and suspended clay, before proceeding with the analysis of the microplastics.

In addition, the outlet water quality monitoring system is equipped with both an image capture unit and an FT-IR analysis unit, and can simultaneously analyze the morphological characteristics and materials of the microplastic.

In addition, the water quality monitoring system of these outlets analyzes the water quality at the outlets of each sewage treatment plant, and transmits it to the integrated monitoring system only when a problem occurs, reducing the amount of data transmitted and received, and processing faster Is possible.

Fig. 1 is a block diagram of an outlet water quality monitoring system according to an exemplary embodiment of the present invention.
FIG. 2 is a block diagram of the sample preprocessing unit shown in FIG. 1.
3 is a block diagram of the sample separation unit shown in FIG. 1.
4 is a plan view of the sample separator shown in FIG. 3.
5A and 5B are side views and perspective views for explaining a photographing principle of a 3D image when the image photographing unit of FIG. 1 photographs a 3D image, respectively.
6 is a graph showing the spectral characteristics of each particle of the microplastic.
7 is a graph showing the output of the infrared spectrophotometer (FT-IR) of the present invention.

The present invention may be variously modified and may have various forms, and specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosure form, and it should be understood that all modifications, equivalents, and substitutes included in the spirit and scope of the present invention are included. In describing each drawing, similar reference numerals are used for similar components. In the accompanying drawings, the dimensions of the structures may be exaggerated than actual ones for clarity of the present invention.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from other components. For example, the first component may be referred to as a second component without departing from the scope of the present invention, and similarly, the second component may also be referred to as a first component.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, terms such as “include” or “have” are intended to indicate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, or that one or more other features or It should be understood that the presence or addition possibilities of numbers, steps, actions, components, parts or combinations thereof are not excluded in advance. Also, A and B are'connected' and'joined' means that other components C are included between A and B in addition to A and B being directly connected or joined, so that A and B are connected or combined. It includes things.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. Terms, such as those defined in a commonly used dictionary, should be interpreted as having meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined in the present application. Does not. Also, in the claims of a method invention, the order of each step may be interchanged with each other, unless each step is clearly bound to the order.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.

Fig. 1 is a block diagram of an outlet water quality monitoring system according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the outlet water quality monitoring system 1000 according to an exemplary embodiment of the present invention includes a microplastic detection unit 1100, a hazardous environment detection unit 1200, an edge computer 1400, and an integrated monitoring system 1500 ). Meanwhile, the water quality monitoring system 1000 of the outlet may further include an automatic collection unit 1300.

The automatic collection unit 1300 collects sewage to be inspected at a discharge port of a sewage treatment plant. The automatic collection unit 1300 is installed at a discharge port of a sewage treatment plant, and pumps sewage to be inspected using a small pump.

The microplastic detection unit 1100 analyzes the microplastics of sewage to be inspected by the automatic collection unit 1300. For example, the microplastic detection unit 1100 may include a sample pre-processing unit 1110, a sample separation unit 1120, and an FT-IR analysis unit 1140. The microplastic detection unit 1100 may further include an image photographing unit 1130.

The sample pre-processing unit 1110 may remove suspended matter including plankton from sewage to be inspected collected from the automatic collection unit. In the sewage to be tested, there may be suspended particles having a size distribution similar to that of microplastics such as phytoplankton and animal plankton, suspended clays, and these substances may act as a major factor that interferes with the qualitative and quantitative analysis of microplastics. Therefore, in the outlet water quality monitoring system 1000 according to the present invention, the accuracy of the inspection can be improved by extracting only the fine plastic by the sample pre-processing unit 1110 and performing the analysis. The sample pre-processing unit 1110 will be described in more detail with reference to FIG. 2.

The sample separation unit 1120 may separate the microplastic inside the sewage to be inspected, in which suspended substances are removed by the sample pre-processing unit 1110. The sample separator 1120 will be described in more detail with reference to FIGS. 3 and 4.

The image photographing unit 1130 may capture an image of the separated microplastic. Meanwhile, the image photographing unit 1130 may photograph a 2D or 3D image. Depending on the shape, the microplastic may be classified into fabric, fragment, pellet, and sheet types. The image photographing unit 1130 photographs a 2D or 3D image of the microplastic By sending it to the edge computer 1400, the edge computer 1400 can classify the morphological features of these microplastics. To this end, the edge computer 1400 may analyze a database (not shown) that stores characteristics of each shape of the microplastic and characteristics of each shape through the comparison unit 1420 and the determination unit 1430.

Meanwhile, in order for the image photographing unit 1130 to photograph a 3D image, the image photographing unit 1130 may include a laser irradiation unit (not shown) and a CCD camera that irradiates a linear laser.

5A and 5B are side views and perspective views for explaining a photographing principle of a 3D image when the image photographing unit of FIG. 1 photographs a 3D image, respectively.

Referring to FIGS. 5A and 5B, when a linear laser is inclinedly irradiated toward an object to be inspected, the height of the object to be inspected can be known. For example, when irradiating a linear laser at an angle of θ relative to the ground, the linear laser is shifted by a distance d by the object to be tested, so the height h of the object to be tested can be calculated as d×tanθ. Therefore, when scanning a linear laser in a predetermined direction and capturing an image at a predetermined time interval, a 3D image of the object to be inspected can be analyzed.

Referring to FIG. 1 again, the image capturing unit 1130 described above is for morphological characterization of the microplastic, while the FT-IR analysis unit 1140 analyzes the components of the separated microplastic. Can. In the case of microplastics, depending on the materials of construction, polypropylene (PP), EPS, polyethylene (PE), polyvinylchloride (PVC), polyvinyl alcohol (PVA), polyvinyl sulfite ( polyvinylsulfate: PVS). Since each polymer has a different IR spectrum, it may be possible to track different contaminants (eg, fishing gear, dyes, and other plastics) from constituent materials classified through FT-IR analysis results.

Figure 6 is a graph showing the spectral characteristics of each particle of the microplastic, Figure 7 is a graph showing the output of the infrared spectrophotometer (FT-IR) of the present invention. As described above, since the infrared spectral luminosity varies depending on the type of the polymer, in the present invention, the constituent materials of the microplastic can be analyzed through the FT-IR analysis unit 1140. The particle-specific spectrum as shown in FIG. 6 is stored in the plastic spectrum database 1450.

Referring back to FIG. 1, the hazardous environment detection unit 1200 analyzes the harmful gas of sewage to be inspected by the automatic collection unit. The harmful environment detection unit 1200 may include a sensor unit 1210 and an RTU (1220, Remote Terminal Unit, 1220).

The sensor unit 1210 includes a sensor for detecting harmful gas. In more detail, the sensor unit 1210 may include at least one of gas sensors such as an electrochemical gas sensor, a catalytic gas sensor, a semiconductor gas sensor, and an optical gas sensor.

The electrochemical gas sensor detects gas by changing electromotive force between electrodes due to reaction with gas, and can detect CO, CO ₂ , O ₃ , SO ₂ , NO, NO ₂ , and VOC. In addition, the contact-combustion type gas sensor detects gas by changing the resistance of the heating wire by an exothermic reaction with the combustible gas, and can detect flammable gases such as H ₂ , CH ₄ , C ₃ H ₈ , and C ₄ H ₁₀ . have. In addition, the semiconductor gas sensor detects gas by changing the resistance of the metal oxide according to the reaction with the gas, and is suitable for gas detection of CO, NO ₂ , SO ₂ , H ₂ S, VOC (alcohol, HCHO, etc.) In addition, the optical gas sensor detects gas by changing the infrared absorption by the gas, and is suitable for detecting gases such as CO, CO ₂ , NO, NO ₂ , SO ₂ , O ₂ , and C _x H _y .

The RTU 1210, although not shown, may be configured to include a CPU, I/O, a communication module, an IoT connection module, and a security module.

The edge computer 1400 processes the analysis data received from the microplastic analysis module and the harmful gas analysis module. To this end, the edge computer 1400 may include a transceiver 1410, a comparison unit 1420, a determination unit 1430, a harmful gas database 1440 and a plastic spectrum database 1450.

The transceiver 1410 receives data from the image capturing unit 1130 and the FT-IR analysis unit 1140, and transmits the results to be analyzed by the edge computer 1400 to the integrated monitoring system 1500.

The comparison unit 1420, the data of the image capture unit 11300 and the FT-IR analysis unit 1140 or the harmful gas data of the hazardous environment detection unit 1200 plastic spectrum database 1450 and harmful gas database, respectively Compared to the data stored in (1440), the shape and composition of the microplastic and the composition of the harmful gas are sequentially compared.

Subsequently, the determination unit 1430 determines the shape of the microplastic and the components of the harmful gas using the data having the same pattern.

On the other hand, such, the automatic collection unit 1300, the microplastic detection unit 1100. The hazardous environment detection unit 1200 and the edge computer 1400 are individually installed in respective sewage treatment plants such as, for example, Jungnang Sewage Treatment Plant in Seoul, Nanji Sewage Treatment Plant, Seonam Sewage Treatment Plant, and the integrated monitoring system 1500 It is for integrated management of all sewage treatment plants.

The integrated monitoring system 1500, when the analysis results of the edge computer 1400 of each sewage treatment plant, at least one of the fine plastic content and the harmful gas content is more than the set value, the corresponding sewage treatment plant and analysis results from the edge computer 1400 Is received from the edge computer 1400, and analyzes and diagnoses operation information of the sewage treatment plant.

As described above, the water quality monitoring system 1000 according to the present invention analyzes water quality at the discharge ports of each sewage treatment plant in the edge computer 1400 and transmits it to the integrated monitoring system 1500 only when a problem occurs. , It reduces the amount of data transmitted and received, and enables faster processing.

FIG. 2 is a block diagram of the sample preprocessing unit shown in FIG. 1.

1 and 2, for example, the sample pre-processing unit 1110 may include a metering unit 1111, a hydrogen peroxide mixing unit 1112, a washing unit 1113, and a drying unit 1114. Meanwhile, the sample pre-processing unit 1110 may further include an iron sulfide mixing unit 1115.

The metering unit 1111 may measure the volume of sewage to be inspected. Alternatively, the metering unit 1111 may measure the mass of sewage to be inspected. As described above, by measuring the volume of the sewage to be inspected in the metering unit 1111, the microplastic content of the sewage to be inspected per unit volume can be calculated, along with the quantity of the microplastic to be measured.

The hydrogen peroxide mixing unit 1112 may mix hydrogen peroxide (H ₂ O ₂ ) with sewage to be tested. The hydrogen peroxide is for decomposing organic substances, and approximately 30% of hydrogen peroxide water can be mixed. At this time, the iron sulfide mixture 1115 may further include 0.05M of iron sulfide.

The cleaning unit 1113 may clean microplastics of sewage to be inspected. General water may be used to clean the microplastic.

The drying unit 1114 may dry the washed microplastic. The drying unit 1114 may blow air to dry the microplastic, or blow hot air for faster drying.

3 is a block diagram of the sample separator shown in FIG. 1, and FIG. 4 is a plan view of the sample separator shown in FIG. 3.

Referring to FIGS. 3 and 4, for example, the sample separation unit 1120 may include a first filter unit 1121 and a second filter unit 1122. In FIG. 3, two filter units are provided, but one or three or more filters may be provided as necessary.

The first filter unit 1121 may filter particles having a first size or more.

The second filter unit 1122 may filter particles of a second size or more smaller than the first size.

The first size and the second size above can be arbitrarily selected, so that plastics in the range of 1 to 5 mm and plastics of 1 mm or less can be detected.

For example, at least one of the first filter unit 1121 and the second filter unit 1122 may include a rotating plate 1121b, a filter 1121a, and a motor 1121c.

The rotating plate 1121b includes at least one opening. For example, the rotating plate 1121b may be manufactured in a circular plate shape. For example, the opening may also be formed in a circular shape. Such openings can be arranged in a roulette shape.

The filter 1121a may be rotatably disposed in the opening. The motor 1121c may rotate the filter 1121a. When the fine plastic falls from the upper side, for example, to the filter 1121a at 3 o'clock, the rotating plate 1121b rotates around the rotation axis A to rotate the dropped plastic in the direction of 12 o'clock, for example, at 12 o'clock After taking a 2D or 3D image in the image capturing section in the upper direction, and then burning again at 9 o'clock to perform infrared inspection in the FT-IR analysis section in the upper portion at 9 o'clock, after rotating in the 6 o'clock direction, the motor The filter 1121a is turned over by rotating (1121c) to discard the fine plastic on the top of the filter 1121a. At this time, an air blower or a motor capable of applying vibration may be additionally installed on the upper portion so as to more easily fall to the lower part of the microplastic.

In the detailed description of the present invention described above, it has been described with reference to preferred embodiments of the present invention, but those skilled in the art or those skilled in the art will appreciate the spirit of the present invention as set forth in the claims below. And it will be understood that various modifications and changes can be made to the present invention without departing from the scope of the technology.

1000: Outlet water quality monitoring system
1100: microplastic detection unit 1110: sample pre-processing unit
1111: gyerang 1112: hydrogen peroxide mixture
1113: cleaning unit 1114: drying unit
1120: sample separation unit 1121: first filter unit
1121a: filter 1121b: rotating plate
1121c: motor 1122: second filter unit
1130: image capture unit 1140: FT-IR analysis unit
1200: hazardous environment detection unit 1210: sensor unit
1220: RTU 1300: automatic collection unit
1400: edge computer 1410: transceiver
1420: comparison unit 1430: judgment unit
1440: Hazardous Gas Database 450: Plastic Spectrum Database
1500: Integrated monitoring system

Claims (10)

An automatic collection unit for collecting sewage to be inspected at a discharge port of a sewage treatment plant;
A microplastic detection unit for analyzing microplastics of sewage to be inspected;
A hazardous environment detection unit for analyzing the harmful gas of sewage to be inspected by the automatic collection unit;
An edge computer processing analysis data received from the microplastic analysis module and the harmful gas analysis module; And
When the analysis results of the edge computer of each sewage treatment plant, at least one of the fine plastic content and the harmful gas content is more than a set value, the corresponding sewage treatment plant and analysis results are received from the edge computer from the edge computer to analyze the operation information of the sewage treatment plant. Monitoring system to diagnose and diagnose;
Including,
The microplastic detection unit,
A sample pre-treatment unit for removing suspended matter including plankton from sewage to be inspected collected from the automatic collection unit;
A sample separating part for separating the microplastic inside the sewage to be inspected from which the suspended matter is removed by the sample pre-processing part;
An image capturing unit capturing an image of the separated microplastic; And
FT-IR analysis unit for analyzing the components of the separated microplastic;
Including,
The sample separation unit,
A first filter unit that filters out particles of a first size or larger; And
A second filter unit to filter particles of a second size or more smaller than the first size;
It includes,
At least one of the first filter unit and the second filter unit,
A rotating plate comprising at least one opening;
A filter rotatably disposed in the opening; And
Motors for rotating the filters, respectively;
Including,
When the sample pre-processed by the sample pre-processing unit falls on a filter, the rotating plate is rotated 90 degrees first, the image of the sample is taken by the image capturing unit, and the rotating plate is rotated 90 degrees second, and the FT In the IR analysis unit, an infrared inspection is performed, the rotating plate rotates 90 degrees three times, the motor rotates the filter 180 degrees, discharges the sample downward, and the rotating plate rotates 90 degrees fourth Outlet water quality monitoring system, characterized by receiving the sample by rotating.
delete According to claim 1,
The sample pre-processing unit,
A metering unit for measuring the volume of sewage to be inspected;
A hydrogen peroxide mixing unit for mixing hydrogen peroxide with the sewage to be tested;
A cleaning unit for cleaning the microplastics of the sewage to be inspected; And
A drying unit for drying the washed microplastic;
Outlet water quality monitoring system comprising a.
According to claim 1,
The sample pre-processing unit,
Iron sulfide mixture;
Outlet water quality monitoring system further comprising a.
According to claim 1,
The image photographing unit,
Outlet water quality monitoring system, characterized by taking a 3D image.
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