CN115552217A

CN115552217A - Flow-down device, water quality inspection system and water quality inspection method

Info

Publication number: CN115552217A
Application number: CN202180033807.3A
Authority: CN
Inventors: 福水圭一郎; 横山知士; 宮之下友明
Original assignee: Organo Corp
Current assignee: Organo Corp
Priority date: 2020-09-07
Filing date: 2021-07-29
Publication date: 2022-12-30
Also published as: WO2022049941A1; JP7481967B2; TW202212797A; JP2022044371A

Abstract

The invention provides a flow-down device which can easily perform stable water quality inspection of target water in a water treatment facility. The flow-down device (200) is used for shooting water flowing down by using a camera, and comprises: an inflow unit (210) which is connected to the water treatment device and into which the supply water flows; and a flow-down part (230) that discharges the inflowing water so that the water flowing into the inflow part (210) flows down.

Description

Flow-down device, water quality inspection system and water quality inspection method

Technical Field

The invention relates to a flow-down device, a water quality inspection system and a water quality inspection method.

Background

In clean water plants, sewage treatment plants, and other water treatment facilities, it is necessary to measure the quality of treated water. For example, light is irradiated to the measurement target water, light transmitted through the measurement target water is received, and the received light intensity is compared with a threshold value. A water quality sensor that obtains water quality information using the result of the comparison is considered (for example, see patent document 1).

Prior art documents

Patent document

Patent document 1: japanese patent laid-open publication No. 2011-22083

Disclosure of Invention

(problems to be solved by the invention)

In the water quality sensor described in patent document 1, the water quality sensor is contaminated by suspended substances and the like contained in the measurement target water. Therefore, there is a problem that the sensitivity of the water quality sensor is lowered and the maintenance frequency is increased.

The invention aims to provide a flow-down device, a water quality inspection system and a water quality inspection method, which can easily perform stable water quality inspection on target water.

(means for solving the problems)

The present invention provides a flow-down device for imaging water flowing down by using a camera, comprising:

an inflow unit which is connected to a water treatment device and into which water to be supplied flows; and

and a flow-down part which discharges the water so that the water flowing into the inflow part flows down.

Further, the water quality inspection system of the present invention includes:

a flow-down device;

an imaging device that images water flowing down from the lower stream portion through an air layer; and

an arithmetic device that performs an arithmetic operation based on the image captured by the imaging device,

the flow-down device is a flow-down device for shooting water flowing down by using a camera, and comprises:

and a flow-down part which discharges the water flowing into the inflow part so as to flow downward.

The water quality inspection method of the present invention includes the following steps:

a step of allowing water stored in a water treatment apparatus to flow into a flow-down device from an inflow unit connected to the water treatment apparatus;

a process of discharging the water flowing into the inflow part in a manner of flowing down from the flow-down device;

a process of imaging the water flowing down from the flowing-down device by an imaging device arranged outside the flowing-down device; and

the arithmetic device performs a predetermined arithmetic process based on the captured water image.

(effect of the invention)

In the present invention, stable water quality inspection of target water can be easily performed.

Drawings

Fig. 1 is a diagram showing a water quality inspection system according to a first embodiment of the present invention.

Fig. 2 is a view showing an example of the internal structure of the flow-down device shown in fig. 1.

Fig. 3 is a diagram showing a water quality inspection system according to a second embodiment of the present invention.

Fig. 4 is a view showing an example of the internal structure of the flow-down device shown in fig. 3.

Fig. 5 is a view showing an example of a cross section of the flow-down device shown in fig. 4.

Fig. 6 is a diagram showing an example of arrangement positions of the imaging device shown in fig. 3 in a case where 2 light sources are provided in the imaging range.

Fig. 7 is a diagram showing an example of the correlation between the characteristic amount calculated by the arithmetic device shown in fig. 3 and the suspended solids concentration.

Fig. 8 is a diagram showing a water quality inspection system according to a third embodiment of the present invention.

Fig. 9 is a view showing an example of the internal structure of the flow-down device shown in fig. 8.

Fig. 10 is a view showing an example of a cross section of the flow-down device shown in fig. 9.

Fig. 11 is a view of the flow-down device shown in fig. 10 as viewed from the direction a.

Fig. 12 is a view of the flow-down device shown in fig. 10 as viewed from the direction B.

FIG. 13 is a view showing another example of the cross section of the flow-down device shown in FIG. 9.

FIG. 14 is a view showing an example of a cross section of the flow-down device after the multi-stage bypass flow mechanism shown in FIG. 10 is connected.

Fig. 15 is a diagram showing a water quality inspection system according to a fourth embodiment of the present invention.

Fig. 16 is a view showing an example of the internal structure of the flow-down device shown in fig. 15.

Fig. 17 is a view showing an example of a cross section of the flow-down device shown in fig. 16.

Fig. 18 is a diagram showing a first application example of the water quality inspection system of the present invention.

Fig. 19 is a diagram showing a second application example of the water quality inspection system of the present invention.

Fig. 20 is a diagram showing a third application example of the water quality inspection system of the present invention.

Detailed Description

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

(first embodiment)

Fig. 1 is a diagram showing a water quality inspection system according to a first embodiment of the present invention. As shown in fig. 1, the water quality inspection system of the present embodiment includes a water treatment apparatus 100, a flow-down apparatus 200, an imaging apparatus 300, and a calculation apparatus 400.

The water to be treated, which is raw water containing suspended matter, flows into the water treatment apparatus 100. The water treatment apparatus 100 is a storage tank for storing the inflow water to be treated. The water treatment apparatus 100 is also a reaction tank into which a flocculant is injected from the outside with respect to the stored water to be treated. The flow-down device 200 is connected to a main line from the water treatment device 100. The flow-down device 200 rectifies water from the water treatment apparatus 100. The image pickup device 300 picks up an image of the water rectified by the downflow device 200. The imaging device 300 may be an image sensor (camera) that captures an image of water, for example. When the image pickup device 300 is an image sensor, the image pickup device 300 may be a camera (for example, a camera for taking a moving image) that picks up an image of the water rectified by the flow-down device 200 at a time interval equal to or shorter than a predetermined time interval. An example of a camera that can be used as the imaging device 300 is k8-USB (manufactured by KATO photonics K.K.). In the case of using a high-speed camera as the imaging device 300, the imaging speed (frame rate) of the imaging device 300 is preferably faster. For example, the imaging speed of the imaging device 300 is more preferably 60fps or more. The number of pixels of the image pickup device 300 is preferably larger. For example, the number of pixels of the imaging device 300 is more preferably 130 ten thousand or more. The shutter speed of the image pickup apparatus 300 is preferably faster. For example, the shutter speed of the imaging device 300 is more preferably 1/8s or less. The image sensor of the image pickup device 300 may be a CCD, a CMOS, or the like, and is not particularly limited, but it is preferable to combine a monochrome CMOS and a monochrome back plate (described later). The arithmetic unit 400 performs a predetermined arithmetic operation on the image captured by the image capturing device 300. For example, the arithmetic device 400 calculates a feature amount (for example, an area of a white portion (white area)) from an image captured by the imaging device 300. The imaging device 300 and the arithmetic device 400 may be connected so long as they can communicate with each other. The connection between the imaging device 300 and the arithmetic device 400 may be, for example, a wireless connection or a wired connection. The imaging device 300 and the arithmetic device 400 may be connected via a communication network.

Fig. 2 is a view showing an example of the internal structure of the flow-down device 200 shown in fig. 1. As shown in fig. 2, the flow-down device 200 shown in fig. 1 has an inflow portion 210, a rectifying portion 220, and a flow-down portion 230. Fig. 2 shows only the main components of the present embodiment among the components of the flow-down device 200 shown in fig. 1.

The inflow unit 210 is connected to a main line through which water stored in the water treatment apparatus 100 flows. Water from the water treatment device 100 flows into the inflow portion 210. The rectifying unit 220 rectifies the water flowing from the inflow unit 210. The downflow part 230 causes the water rectified by the rectifying part 220 to flow down to the outside of the downflow device 200. The flow-down device 200 having these structures may be a valve connected to a main line through which water flows from the water treatment device 100.

In this way, in the water quality inspection system of the present embodiment, the downflow device 200 rectifies the treated water from the water treatment device 100. The image pickup device 300 picks up an image of the rectified water. The arithmetic device 400 performs a predetermined arithmetic operation based on the image captured by the imaging device 300. Therefore, stable water quality inspection of the target water can be easily performed.

(second embodiment)

Fig. 3 is a diagram showing a water quality inspection system according to a second embodiment of the present invention. As shown in fig. 3, the water quality inspection system of the present embodiment includes a water treatment apparatus 100, a flow-down apparatus 201, an imaging apparatus 300, and a calculation apparatus 400. The water treatment apparatus 100, the imaging apparatus 300, and the arithmetic apparatus 400 are the same as those of the first embodiment.

Fig. 4 is a diagram showing an example of the internal structure of the flow-down device 201 shown in fig. 3. As shown in fig. 4, the flow-down device 201 shown in fig. 3 has an inflow portion 211, a rectifying portion 221, and a flow-down portion 231. Fig. 4 shows only the main components related to this embodiment among the components of the flow-down device 201 shown in fig. 3.

The inflow portion 211 is connected to a branch line branching from a main line through which water stored in the water treatment apparatus 100 flows. The inflow portion 211 is an opening into which a part of the water from the water treatment apparatus 100 flows. The rectifying unit 221 rectifies the water flowing from the inflow unit 211. A specific rectifying structure of the rectifying unit 221 will be described later. The downflow part 231 discharges the water flowing into the inflow part 211 to the outside of the downflow device 201 so that the water flows downward. Specifically, the flow-down part 231 causes the water rectified by the rectifying part 221 to flow down to the outside of the flow-down device 201.

Fig. 5 is a view showing an example of a cross section of the flow-down device 201 shown in fig. 4. As shown in fig. 5, the inflow portion 211 is provided on a side wall surface of the flow-down device 201. The downflow unit 231 is provided on a side surface of the downflow unit 202 opposite to the side wall surface on which the inflow unit 211 is provided. The flow-down portion 231 has a pipe shape in which the discharge port 2312 faces downward in the vertical direction. The drain port 2312 is an opening through which the water flowing into the downflow device 201 is discharged to the outside of the downflow device 201. The opening portion of the discharge port 2312 is circular in cross section. This is because the cross-sectional shape of the water discharged (flowing down) from the discharge port 2312 is circular. A valve 2311 serving as an on-off valve for adjusting the amount of water flowing downward is provided in the lower flow portion 231. Further, the valve 2311 may not be provided in the lower flow portion 231. The flow control unit 221 is provided with a shielding plate 241 and 2 channels 251 and 261. Further, a back panel 271 is provided outside the side wall surface of the downflow device 201 where the downflow portion 231 is provided.

The shielding plate 241 is disposed to extend in the substantially vertical direction in the under-flow device 201 so as to shield the flow of water in a direction perpendicular to the flow direction of the water flowing in from the inflow portion 211. The flow path 251 is a first flow path for guiding water flowing from the inflow portion 211 and blocked by the blocking plate 241 in the horizontal direction vertically downward (in a direction perpendicular to the flow direction of the inflowing water). The flow path 261 is a second flow path for guiding water from the lower portion of the flow path 251 to the downflow portion 231. Thus, the rectifying unit 221 includes a bypass mechanism including the shielding plate 241 and the channels 251 and 261. The bypass flow mechanism is a mechanism that changes the direction of the flow of water flowing in the horizontal direction from the inflow portion 211 in the vertical downward direction, and further changes the direction of the flow in the vertical upward direction to guide the flow to the flow lower portion 231. The downflow portion 231 is disposed in the flow path 261. The downflow part 231 is disposed at a position higher than the connecting position between the flow channel 251 and the flow channel 261 and lower than the height at which the inflow part 211 is disposed. Further, the size of the shielding plate 241 is preferably larger than the opening area of the inflow portion 211. The mounting position of the shielding plate 241 is preferably a position where the lower end of the shielding plate 241 is located lower than the downflow part 231. The inflow portion 211 may be provided below the flow-down device 201 (near or at the bottom). In this case, the shielding plate 241 may be provided or may not be provided.

The downflow part 231 has a shape that allows water to flow from the side surface of the downflow device 201 toward the outlet 2312, which allows water to flow downward in the vertical direction. Therefore, a gap can be generated between the flow-down portion 231 and the side wall surface of the flow-down device 201. Therefore, as shown in fig. 5, an air layer can be formed between the back plate 271 and water flowing downward in the vertical direction from the outlet 2312. The imaging device 300 images water flowing down from the flow-down part 231 through an air layer. That is, the back panel 271 is provided at a position facing the image pickup device 300 with water flowing down from the downflow part 231 therebetween. The color of the back panel 271 is not particularly limited. The color of the back panel 271 is preferably 2 colors of white and black in order to obtain stable image data by absorption and reflection of light from the treated water.

Further, light may be irradiated from a light source in the imaging range of the imaging device 300. Fig. 6 is a diagram showing an example of the arrangement position of the imaging device 300 shown in fig. 3 when 2 light sources are provided in the imaging range. As shown in fig. 6, 2 light sources 500-1, 500-2 irradiate light in the shooting range of the image pickup device 300. The light source 500-1 and the light source 500-2 irradiate light from the imaging device 300 in a direction orthogonal to the imaging direction of the imaging device 300 and the flow direction of water, in the imaging range in which water is imaged with the back plate 271 as the back surface. In addition, the light source 500-1 and the light source 500-2 irradiate light from directions opposite to each other, respectively. In addition, it is preferable that the distance from the light source 500-1 to the water flowing in the photographing range is equal to the distance from the light source 500-2 to the water flowing in the photographing range. In addition, the intensity of the light irradiated from the light source 500-1 is preferably equal to the intensity of the light irradiated from the light source 500-2. The intensity of light emitted from the light sources 500-1 and 500-2 is preferably 5,000 to 100,000lx. The type of illumination emitted from the light sources 500-1 and 500-2 and the wavelength of the light to be emitted are not particularly limited. Further, by performing in advance a component analysis of a substance to be detected or a spectroscopic measurement using a spectroscope, the detection accuracy of the substance can be improved.

The arithmetic unit 400 analyzes the image captured by the imaging device 300. For example, the arithmetic unit 400 may calculate a feature amount of an image captured by the imaging device 300 and calculate the suspension concentration of water based on the calculated feature amount in order to check the quality of water captured by the imaging device 300. The following description will be given by way of specific examples. The arithmetic unit 400 performs image processing on the still image captured by the imaging device 300 and converts image information into numerical values. For example, the arithmetic device 400 may perform binarization processing on the image captured by the imaging device 300 and calculate the suspended solids concentration of the water based on the value obtained as a result of the binarization processing. In this case, the arithmetic unit 400 may perform binarization processing on a plurality of images, average the respective numerical values, and calculate the suspended matter concentration of water based on the average value.

Fig. 7 is a diagram showing an example of the correlation between the characteristic amount calculated by the arithmetic unit 400 shown in fig. 3 and the suspended solids concentration. As shown in fig. 7, the correlation between the suspended matter concentration and the characteristic quantity such as the white area obtained from the image is calculated in advance. Based on this correlation, the arithmetic device 400 can obtain the suspended solid concentration corresponding to the feature amount (white area) calculated from the image captured by the imaging device 300. The calculation method in the calculation device 400 is not limited to this, and is not particularly limited as long as the water quality can be obtained from the image captured by the imaging device 300.

The arithmetic device 400 is not particularly limited as long as it performs arithmetic Processing by a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), or the like.

In this way, in the water quality inspection system of the present embodiment, the downflow device 201 causes water flowing in the horizontal direction from the inflow portion 211 provided on the side wall surface to flow downward in the vertical direction from the downflow portion 231 provided on the side wall surface on the opposite side. At this time, the water flowing in the horizontal direction from the inflow portion 211 is guided vertically downward by the flow path 251 using the shielding plate 241 provided in the vertical direction. Next, the water guided in the vertically downward direction is guided by the flow path 261 connected to the flow path 251 to the flow-down portion 231 provided on the side wall surface of the downflow device 201 at a position higher than the connection position and lower than the inflow portion 211. Then, the water guided to the pipe-shaped flow-down portion 231 flows down from the vertical direction toward the discharge port 2312 provided downward. The water flows down from the outlet 2312 having a circular cross-sectional shape. Then, the image pickup device 300 picks up the water flowing down with the cross-sectional shape being circular. The arithmetic device 400 performs a predetermined arithmetic operation based on the image captured by the imaging device 300. Therefore, an image can be obtained that facilitates calculation of the water quality of the water stored in the water treatment apparatus 100. In addition, stable water quality inspection of the target water can be easily performed.

(third embodiment)

Fig. 8 is a diagram showing a water quality inspection system according to a third embodiment of the present invention. As shown in fig. 8, the water quality inspection system of the present embodiment includes a water treatment apparatus 100, a flow-down apparatus 202, an imaging apparatus 300, and a calculation apparatus 400. The water treatment apparatus 100, the imaging apparatus 300, and the arithmetic apparatus 400 are the same as those of the first embodiment.

Fig. 9 is a diagram showing an example of the internal structure of the flow-down device 202 shown in fig. 8. As shown in fig. 9, the flow-down device 202 shown in fig. 8 has an inflow portion 211, a rectifying portion 221, and a flow-down portion 232. Fig. 9 shows only the main components related to this embodiment among the components of the flow-down device 202 shown in fig. 8.

The inflow portion 211 is connected to a branch line branched from a main line through which water stored in the water treatment apparatus 100 flows. The inflow portion 211 is an opening into which a part of water from the water treatment apparatus 100 flows. The rectifying unit 221 rectifies the water flowing from the inflow unit 211. A specific rectifying structure of the rectifying unit 221 will be described later. The downflow part 232 is an opening through which the water rectified by the rectifying part 221 flows down to the outside of the downflow device 202.

Fig. 10 is a view showing an example of a cross section of the flow-down device 202 shown in fig. 9. As shown in fig. 10, the inflow portion 211 is provided on a side wall surface of the flow-down device 202. The downflow unit 232 is provided on the side surface of the downflow unit 202 opposite to the side wall surface on which the inflow unit 211 is provided. The flow straightening portion 221 is provided with a shielding plate 241 and 2 flow paths 251 and 261. Further, a rear plate 271 is provided on the outer side of the side wall surface of the downflow device 202 on which the downflow portion 232 is provided.

The shielding plate 241 is disposed to extend in the substantially vertical direction in the under-flow device 202 so as to shield the flow of water in a direction perpendicular to the flow direction of water flowing in from the inflow portion 211. The flow path 251 is a first flow path for guiding water flowing from the inflow portion 211 and blocked by the blocking plate 241 in the horizontal direction vertically downward (in a direction perpendicular to the flow direction of the inflowing water). The flow path 261 is a second flow path for guiding water from the lower portion of the flow path 251 to the lower portion 232. Thus, the rectifying unit 221 includes a bypass mechanism including the shielding plate 241 and the channels 251 and 261. The bypass flow mechanism is a mechanism that changes the direction of the flow of water flowing in the horizontal direction from the inflow portion 211 in the vertical downward direction, and further changes the direction of the flow in the vertical upward direction to guide the water to the flow lower portion 232. The downflow portion 232 is disposed in the flow path 261. The downflow part 232 is disposed at a position higher than the connecting position of the flow channel 251 and the flow channel 261 and lower than the height at which the inflow part 211 is disposed. The size of the shielding plate 241 is preferably larger than the opening area of the inflow portion 211. The mounting position of the shielding plate 241 is preferably a position where the lower end of the shielding plate 241 is located lower than the lower flow portion 232. The inflow portion 211 may be provided below the flow-down device 202 (near or at the bottom). In this case, the shielding plate 241 may be provided or may not be provided.

Fig. 11 is a view of the flow-down device 202 shown in fig. 10 as viewed from the direction a. As shown in fig. 11, the opening of the lower portion 232 has a rectangular shape that is horizontally long. In addition, guide plates 281 are provided on 2 short sides of the opening portion of the flow lower portion 232, respectively. The opening area of the flow-down portion 232 is larger than that of the inflow portion 211.

Fig. 12 is a view of the flow-down device 202 shown in fig. 10 as viewed from the direction B. As shown in fig. 12, the guide plate 281 shown in fig. 11 is provided so as to extend from the lower portion 232 in the direction of the water flow. The water flowing down from the lower flow part 232 flows out in the horizontal direction from the lower flow part 232. Then, the flow direction of the water is changed in a waterfall manner toward a vertically downward direction due to gravity. This is because the flow-down part 232 is arranged at the side of the flow-down device 202. The length of the guide plate 281 is at least the length of the water flowing out from the lower part 232 in the horizontal direction. By providing the guide plate 281 in this manner, surface tension of water acts between the water flowing out in the horizontal direction from the flow-down portion 232 and the guide plate 281. By this surface tension, the water is sucked into the guide plate 281 and flows vertically downward in a flat state along the side surface of the flow-down device 202 where the flow-down portion 232 is provided.

Fig. 13 is a view showing another example of the cross section of the flow-down device 202 shown in fig. 9. By using the guide plate 282 extending in the vertically downward direction as shown in fig. 13, an effect of more stably capturing an image of a flow can be obtained as compared with the case of using the guide plate 281 shown in fig. 10. In the example shown in fig. 13, the guide plate 282 extends to the bottom of the flow-down device 202.

Further, the liquid flows out in the horizontal direction from the lower flow portion 232 as described above. Therefore, as shown in fig. 13, an air layer can be formed between the water flowing down in the vertical downward direction and the back plate 271. The imaging device 300 images water flowing down from the flow-down part 232 through an air layer. A back panel 271 is provided at a position facing the image pickup device 300 with water flowing down from the flow-down part 232 interposed therebetween. The color of the back panel 271 is not particularly limited. The color of the back panel 271 is preferably 2 colors of white and black in order to obtain stable image data by absorption and reflection of light from the treated water.

Further, the above-described bypass flow mechanism may be connected in multiple stages. FIG. 14 is a view showing an example of a cross section of the flow-down device after the multi-stage bypass flow mechanism shown in FIG. 10 is connected. The rectifying portion 222 of the downflow device 203 shown in fig. 14 is provided with a plurality of shielding plates 241. The rectifying unit 222 guides the water flowing from the inflow unit 211 to the lower flow unit 232 through the flow path 251, the flow path 252, the flow path 253, and the flow path 254, and flows down from the lower flow unit 232.

In this way, in the water quality inspection system of the present embodiment, the downflow device 202 rectifies the treated water from the water treatment apparatus 100. The downflow device 202 guides water flowing in the horizontal direction from the inflow portion 211 provided on the side wall surface to the vertically lower side through the flow path 251 by using the shielding plate 241 provided in the vertical direction. Then, the flow path 261 connected to the flow path 251 leads to the downflow portion 232 provided on the side wall surface of the downflow device 202 at a position higher than the connection position and lower than the inflow portion 211. Then, the water guided to the lower flow portion 232 flows out in the horizontal direction from the lower flow portion 232. After flowing out in the horizontal direction from the downflow unit 232, the imaging device 300 images water flowing down in the vertical downward direction due to gravity. The arithmetic device 400 performs a predetermined arithmetic operation based on the image captured by the imaging device 300. Therefore, an image can be obtained that facilitates calculation of the water quality of the water stored in the water treatment apparatus 100. In addition, stable water quality inspection of the target water can be easily performed.

(fourth embodiment)

FIG. 15 is a diagram showing a water quality inspection system according to a fourth embodiment of the present invention. As shown in fig. 15, the water quality inspection system of the present embodiment includes a water treatment apparatus 100, a flow-down apparatus 204, an imaging apparatus 300, and a calculation apparatus 400. The water treatment apparatus 100, the imaging apparatus 300, and the arithmetic apparatus 400 are the same as those of the first embodiment.

Fig. 16 is a view showing an example of the internal structure of the flow-down device 204 shown in fig. 15. As shown in fig. 16, the flow-down device 204 shown in fig. 15 includes an inflow portion 211, a rectifying portion 221, and a flow-down portion 233. Fig. 16 shows only the main components related to this embodiment among the components of the flow-down device 204 shown in fig. 15. The inflow portion 211 and the rectifying portion 221 are respectively the same as those of the second embodiment.

Fig. 17 is a view showing an example of a cross section of the flow-down device 204 shown in fig. 16. The shape of the flow-down part 232 of the flow-down device 202 shown in fig. 10 in the third embodiment is different from the shape of the flow-down part 233 of the flow-down device 204 shown in fig. 17 in this embodiment. The flow-down part 233 has a cylindrical shape. The flow-down portion 233 may have a cylindrical shape (columnar shape) such as a faucet, for example. The shape of the flow-down portion 233 is preferably such that the flow velocity of water in the flow-down portion 233 is 0.1 to 0.5 m/sec.

In this embodiment, for example, the imaging device 300 images tap water containing flocs (substances obtained by adding a flocculant to water to be treated to coarsen suspended substances in the water) as water to be treated. The arithmetic unit 400 calculates a correlation between the white area of the image captured by the imaging device 300 and the suspended matter concentration. This makes it possible to obtain the correlation shown in fig. 7 in advance.

As described above, in the present embodiment, the flow-down part 232 in the third embodiment is the flow-down part 233 having a cylindrical shape. Thus, the image captured by the image capturing apparatus 300 is more stable. The surface tension of water acts by making the shape of the downflow part 232 cylindrical. Therefore, the cylindrical water is formed, and the disturbance of the water surface can be suppressed. By forming the shape of the water to be captured into a cylindrical shape, the depth of the captured image is increased as compared with the third embodiment in which the water flows out in a thin film form, and the change in color can be increased, so that the water can be easily detected even in the case of water having a low suspended matter concentration.

(application example 1)

Fig. 18 is a diagram showing a first application example of the water quality inspection system of the present invention. The water quality inspection system shown in fig. 18 includes a raw water tank 1001, a downflow device 201, an imaging device 300, a computing device 400, an output device 600, a reaction tank 1002, a coagulation tank 1003, a sedimentation tank 1004, and pumps 701 and 702. The pump 701 feeds the water stored in the raw water tank 1001 to the reaction tank 1002. The reaction tank 1002 is a tank for storing water sent from the raw water tank 1001 by the pump 701. An inorganic coagulant is injected into the reaction tank 1002. The inorganic flocculant is usually aluminum (PAC, aluminum sulfate, etc.) or iron (poly-iron, iron chloride), but is not limited to this, and the coagulation tank 1003 is a tank into which water treated in the reaction tank 1002 is poured, and for example, a polymer is poured into the water stored in the coagulation tank 1003. The water treated in the coagulation tank 1003 is poured into the sedimentation tank 1004, and the poured water is separated into treated water and precipitated sludge in the sedimentation tank 1004. The precipitate is discharged (sludge discharge) to the outside of the precipitation tank 1004 by the pump 702.

The downflow device 201 is disposed at a position where the treated water treated in the precipitation tank 1004 flows in. The flow-down means 201 is connected to a branch line of the treated water from the precipitation tank 1004. The image pickup device 300 picks up the water flowing down from the flow-down device 201. The arithmetic unit 400 performs image processing on the water image captured by the imaging device 300. The output device 600 outputs the result of the image processing performed by the arithmetic device 400. The output device 600 may display the result of the image processing performed by the arithmetic device 400, may perform printing, or may transmit the result to another device. When the output device 600 displays the result, the output device 600 may be a display, a touch panel, a mobile communication terminal, or the like. The output device 600 may output a warning when the result of the calculation by the calculation device 400 does not satisfy a predetermined condition. The arithmetic unit 400 and the output unit 600 may be connected so as to communicate with each other. The connection between the arithmetic device 400 and the output device 600 may be a wireless connection or a wired connection. The computing device 400 and the output device 600 may be connected via a communication network. The computing device 400 may also have an output function of the output device 600.

(application example 2)

Fig. 19 is a diagram showing a second application example of the water quality inspection system of the present invention. In the water quality inspection system shown in fig. 19, the position where the downflow device 201 is disposed is different from that in the first application example. The downflow device 201 is disposed at a position where the treated water treated in the precipitation tank 1004 flows in. The downflow device 201 is connected to a main line of treated water from the settling tank 1004.

(application example 3)

Fig. 20 is a diagram showing a third application example of the water quality inspection system of the present invention. In the water quality inspection system shown in fig. 20, the position where the downflow device 201 is disposed is different from that in the first application example. The flow-down device 201 is disposed between the pump 701 and the reaction tank 1002. The pump 701 feeds the water stored in the raw water tank 1001 to the downflow device 201.

The above application examples 1 to 3 are examples in which the downflow apparatus 201 is applied to a system for performing coagulation sedimentation. The flow-down device 201 may be applied to any system as long as it is a system using a water treatment device for treating suspended substances, dissolved components, and the like. Examples of the system to which the flow-down device 201 can be applied include coagulation and pressurized suspension. Further, in application examples 1 to 3, the example in which the flow-down device 201 is applied is shown, but any of the flow-down devices 200, 203, and 204 may be applied.

In the above description, each function (process) is assigned to each component, but the assignment is not limited to the above assignment. The above-described embodiments are merely examples of the configurations of the components, and are not limited thereto. In addition, the embodiments may be combined.

The present invention has been described above with reference to the embodiments, but the present invention is not limited to the embodiments. The present invention can be modified in various ways within the scope of the present invention as understood by those skilled in the art.

This application claims priority based on Japanese application No. 2020-149962 filed on 7/9/2020 and the disclosure of which is incorporated herein in its entirety.

Claims

1. A running-down device is used for shooting running-down water by a camera,

the flow-down device comprises:

2. Flow-down device according to claim 1,

the outlet of the downflow part for discharging the inflowing water is in a pipeline shape facing downwards in the vertical direction.

3. Flow-down device according to claim 2,

the opening portion of the discharge port has a circular cross section.

4. Flow-down device according to any one of claims 1 to 3,

the flow-down device is also provided with a rectifying part,

the rectifying unit includes:

a shielding plate that shields a flow in a direction perpendicular to a flow direction of the water flowing in from the inflow portion;

a first flow path that guides the water, the flow of which is blocked by the blocking plate, in a direction perpendicular to the flow direction; and

a second flow path that guides the water from the first flow path to the lower flow portion,

the lower flow portion is disposed in the second flow path at a position having the same height as or higher than a connection position of the first flow path and the second flow path.

5. Flow-down device according to claim 4,

the inflow part and the downflow part are respectively arranged on the mutually opposite side wall surfaces of the downflow device,

the second flow path guides the water from a lower portion of the first flow path to the lower flow portion,

the baffle plate extends along the vertical direction in the flow-down device,

the connection position is located below the shielding plate.

6. Flow-down device according to claim 4 or 5,

the shielding plate is located between the first flow path and the second flow path.

7. A flow-down device according to any one of claims 1 to 6,

a back plate is provided between the water flowing down from the flow-down part and the side wall surface of the flow-down device.

8. A water quality inspection system comprises:

a flow-down device according to any one of claims 1 to 7;

an imaging device that images water flowing down from the downstream portion through an air layer; and

and an arithmetic device that performs arithmetic operation based on the image captured by the imaging device.

9. A water quality inspection system according to claim 8,

the water quality inspection system includes a plurality of light sources that irradiate an imaging range of the imaging device with light, and the plurality of light sources irradiate light from directions facing each other across the imaging range.

10. A water quality inspection method comprises the following steps: