JP2019162602A - Diluted sludge imaging system, flocculant addition amount control system, sludge thickening system and diluted sludge imaging method - Google Patents

Abstract

To provide a diluted sludge imaging system that can reduce errors due to imaging of sludge that is a processing object.SOLUTION: A diluted sludge imaging system includes: a storage unit for introducing and storing flocculated sludge after a flocculant and sludge are mixed; a dilution water supply unit for supplying dilution water to the storage unit; and an imaging unit for imaging a liquid level in the storage unit.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a diluted sludge imaging system, a flocculant addition amount control system, a sludge concentration system, and a diluted sludge imaging method.

Solid-liquid separators are used in facilities such as water treatment plants for the purpose of concentrating or dewatering materials to be treated such as sludge. As such a solid-liquid separator, for example, an object to be treated in which a polymer flocculant as an electrolyte is added to sludge is supplied into a cylindrical filtration screen, and a screw arranged in the filtration screen is driven to rotate. There is a concentrating device for filtering an object to be treated and discharging the filtrate. Generally, when the amount of the polymer flocculant added is increased, solid-liquid separation of the object to be processed tends to be promoted.
In controlling the amount of the flocculant injected, for example, the sludge in the flocculent mixing tank is imaged, and the flocculant is injected according to the reflocculated sludge (eg, floc) formation status (eg, floc area). There are ways to control the amount. For example, in the flocculant injection control device of Patent Document 1, in a test tank or the like, an area where a flock can exist in the depth direction of the tank is photographed to evaluate the aggregated sludge.

JP 2005-007338 A

  However, when the flocculant injection control device described above eliminates the measurement error caused by the overlap of flocs caused by the depth of the flocculent mixing tank, the floc average area is measured by photographing the flocs multiple times. It is necessary to ask. Therefore, the floc must be photographed a plurality of times, and in order to improve the measurement accuracy, it is necessary to increase the number of photographing.

  The present invention has been made in view of such circumstances, and its purpose is to measure the properties of the coagulated sludge without the need to increase the number of photographing even when coagulated sludge exists in the depth direction. A diluted sludge imaging system, a flocculant addition amount control system, a sludge concentration system, and a diluted sludge imaging method are provided.

  In order to solve the above-described problem, the present invention introduces and stores the aggregated sludge after the flocculant and sludge are mixed, a dilution water supply unit that supplies dilution water to the storage unit, An imaging unit that images the liquid level of the storage unit.

  The present invention also includes the above-described diluted sludge imaging system, an area detection unit that detects the area of suspended solids present in the separation liquid from the imaging data obtained from the imaging unit, and imaging data obtained from the imaging unit. A contour detection unit that detects a contour of suspended solids present in the separation liquid, a determination unit that compares a relationship between the area of the suspended solids and the contour of the suspended solids, and a reference range, and a comparison of the determination units A flocculant addition amount control system having a control unit that controls the addition amount of the flocculant added by the flocculant addition unit based on the result.

  Moreover, this invention is a sludge concentration system comprised including the above-mentioned flocculant addition amount control system.

  In the present invention, the storage unit stores the coagulated sludge branched from the supply path through which the coagulant and the sludge mixed with the coagulant are supplied, and the dilution water supply unit includes the dilution water in the storage unit. The diluted sludge imaging method in which the imaging unit images the liquid level of the storage unit.

  As described above, according to the present invention, since the aggregated sludge is diluted with the dilution water and the liquid level is photographed, the aggregated sludge is diluted even when photographing a portion having a depth. As a result, it is possible to shoot with a reduced sludge concentration. Thus, by reducing the amount of suspended solids existing in the depth direction, it is possible to take a picture with a reduced overlap and measure the properties of the aggregated sludge. In addition, it is not always necessary to perform a plurality of shootings in order to perform one measurement.

It is a schematic block diagram which shows the structure of the sludge concentration system 1 using the flocculant addition amount control apparatus in 1st Embodiment. 3 is a schematic configuration diagram showing a configuration of an agglomerated sludge monitoring box 34. FIG. 6 is a diagram illustrating a case where a camera 90 images a liquid level of a storage container 341. 6 is a diagram illustrating a case where a camera 90 images a liquid level of a storage container 341. FIG. 2 is a schematic block diagram for explaining a part of functions of a control panel 70, a camera 90, and a computer 80. It is a figure which shows an example of the image data imaged with the camera. It is a figure which shows an example of the image data imaged with the camera. It is a figure showing the relationship between a color area and total perimeter. It is a figure showing the relationship between a color area and the value which divided the color area by total perimeter. 2 is a flowchart illustrating the operation of the sludge concentration system 1. It is a schematic block diagram in the sludge concentration system 1a in 2nd Embodiment.

Hereinafter, a sludge concentration system according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing a configuration of a sludge concentration system 1 using the flocculant addition amount control device according to the first embodiment as an embodiment of the present invention.
The sludge concentration system 1 includes a flocculant supply pump 10, a flocculant flow meter 11, a sludge supply pump 20, a sludge concentration meter 21, a sludge flow meter 22, a mixing tank 30, a pressure gauge 31, a condensed sludge extraction pump 32, and a dilution water supply. The pump 33, the aggregated sludge monitoring box 34, the diluted aggregated sludge supply pump 35, the vertical filtration and concentration device 40, the concentrated sludge extraction pump 50, the control panel 70, and the computer 80 are configured.

The flocculant supply pump 10 supplies chemicals to the processing object in the mixing tank 30 and the path supplied from the sludge supply pump 20 to the mixing tank 30 in accordance with the instruction from the control panel 70. This chemical is, for example, an electrolyte substance containing a component for performing a concentration treatment of an object to be processed, and is, for example, a polymer flocculant (hereinafter also simply referred to as a flocculant). The flocculant supply pump 10 supplies the flocculant so as to obtain a supply amount (also referred to as an injection amount or an injection rate) according to a control signal output from the control panel 70.
The flocculant flow meter 11 measures the supply amount of the flocculant supplied from the flocculant supply pump 10 and outputs the measurement result to the control panel 70.

The sludge supply pump 20 supplies an object to be treated such as sludge supplied from the outside to the mixing tank 30 in accordance with an instruction from the control panel 70. The amount (for example, the volume of the object to be processed per unit time) that the sludge supply pump 20 supplies to the mixing tank 30 is determined based on the drive signal supplied from the control panel 70.
The sludge concentration meter 21 measures the concentration (for example, the concentration of suspended solids in the sludge) supplied from the sludge supply pump 20 and outputs the measurement result to the control panel 70.
The sludge flow meter 22 measures the supply amount of the object to be processed supplied from the sludge supply pump 20 and outputs the measurement result to the control panel 70.

In the mixing tank 30, the flocculant supplied from the flocculant supply pump 10 and the workpiece to be processed supplied from the sludge supply pump 20 are mixed and aggregated.
The pressure gauge 31 detects the pressure (filtration pressure) applied to the filtration screen in the vertical filtration concentrator 40 and outputs the detection result to the control panel 70.

  The agglomerated sludge extraction pump 32 supplies the agglomerated sludge to the agglomerated sludge monitoring box 34 via a branch path branched from a supply path where the agglomerated sludge is fed from the agglomeration mixing tank for mixing the aggregating agent and sludge to the solid-liquid separator. To do. The supply amount of the coagulated sludge supplied by the coagulated sludge extraction pump 32 may be determined by inverter control based on a drive signal supplied from the control panel 70. Further, the aggregated sludge extraction pump 32 may be turned on / off based on a drive signal supplied from the control panel 70. In this case, the supply amount of the coagulated sludge while the coagulated sludge extraction pump 32 is on is constant.

  The dilution water supply pump 33 supplies dilution water to the coagulated sludge monitoring box 34. The diluted water may be any liquid that can dilute the coagulated sludge and has little influence on the solid-liquid separation in the vertical filtration concentration apparatus 40 and the reaggregation of the coagulated sludge. For example, water can be used. The supply amount of the dilution water supplied from the dilution water supply pump 33 may be determined by inverter control based on the drive signal supplied from the control panel 70. The dilution water supply pump 33 may be turned on / off based on a drive signal supplied from the control panel 70. In this case, the supply amount of the coagulated sludge while the dilution water supply pump 33 is on is constant.

The agglomerated sludge monitoring box 34 accommodates the agglomerated sludge branched from the supply path to which the agglomerated sludge mixed with the aggregating agent and the sludge is supplied, and the dilution water supplied from the dilution water supply pump 33. A camera 90 is installed in the coagulated sludge monitoring box 34.
The diluted agglomerated sludge supply pump 35 supplies the agglomerated sludge from the agglomerated sludge monitoring box 34 to the vertical filtration concentrator 40. Here, it is a supply path through which the coagulated sludge is supplied from the mixing tank 30 to the vertical filtration concentrator 40, and is supplied to any part of the downstream side of the branch path extracted by the coagulated sludge extraction pump 32. .

The vertical filtration concentrator 40 has a cylindrical filtration screen having a central axis extending in the vertical direction and into which an object to be treated is supplied. The vertical filtration concentration apparatus 40 is accommodated in the filtration screen and rotates around the central axis. A screw and a filtration container for housing the filtration screen so as to cover the outer peripheral portion and the bottom portion on the side surface side of the filtration screen are provided. The vertical filtration concentration device 40 concentrates the object to be processed by solid-liquid separation of the object to be processed after the flocculant is added and supplied from the mixing tank 30. The vertical filtration concentration apparatus 40 discharges the separated liquid and the concentrated sludge from different paths by performing solid-liquid separation.
The vertical filtration concentrating device 40 only needs to have a function of solid-liquid separation. For example, a decanter centrifugal dehydrator, a screw press dehydrator, a belt press dehydrator, or the like can be applied. In this embodiment, the case where the vertical filtration concentration apparatus 40 is used will be described.

  The concentrated sludge extraction pump 50 removes the object to be processed (concentrated sludge) after being concentrated in the vertical filtration concentrator 40 from the discharge pipe connected to the bottom of the filtration container of the vertical filter concentrator 40 (concentrate). Sludge) is extracted and discharged to the subsequent treatment system.

  The control panel 70 includes an amplifier 71 and a sequencer 72, and controls each part of the sludge concentration system 1. The amplifier 71 is connected to the camera 90 via the communication cable 60, and outputs image data obtained from the camera 90 to the sequencer 72. The sequencer 72 controls each part of the sludge concentration system 1 on the basis of image data obtained from the camera 90 and signals obtained from measuring instruments and the like of each part of the sludge concentration system 1.

The camera 90 is connected to the computer 80, performs various information processing such as image processing and signal processing based on instructions from the computer 80, and outputs processing results to the control panel 70.
The camera 90 has an imaging function, and can perform various types of information processing on the image data that is the imaging result.

Next, the aggregated sludge monitoring box 34 will be further described. FIG. 2 is a schematic configuration diagram showing the configuration of the coagulated sludge monitoring box 34.
The aggregated sludge monitoring box 34 is provided with a storage container 341, an overflow weir 342, and a camera 90.
The storage container 341 stores the aggregated sludge supplied by the aggregated sludge extraction pump 32 via the branch path and the diluted water supplied by the dilution water supply pump 33, and temporarily stores them. In the storage container 341, the coagulated sludge is diluted by being mixed with dilution water. The diluted mixture is temporarily stored in the storage container 341 as diluted agglomerated sludge 343.
The overflow weir 342 constitutes a part of the storage container 341, and the inner peripheral side of the overflow overflow weir 342 is configured as the storage container 341. When aggregated sludge and diluted water are stored in the storage container 341 and the liquid level of the diluted aggregated sludge 343 exceeds the upper end of the overflow weir 342, the diluted aggregated sludge 343 overflows over the overflow weir 342. To do. The overflowing diluted agglomerated sludge 343 is supplied to the vertical filtration concentrator 40 by the diluted agglomerated sludge supply pump 35. Here, the overflowing diluted agglomerated sludge 343 contains dilution water, and the amount thereof is agglomerated sludge that is directly supplied from the mixing tank 30 to the vertical filtration concentrator 40 in the processing after the vertical filtration concentrator 40. Even if dilution water is included, the influence on the solid-liquid separation process in the vertical filtration concentration apparatus 40 is small. Further, the dilution water is solid-liquid separated in the vertical filtration concentrator 40 and discharged out of the system as a separation liquid.

In the storage container 341, the height (depth) from the bottom surface of the storage container 341 to the upper part of the overflow weir 342 is preferably, for example, about 150 mm to 200 mm. It is not preferable because it is affected by the SS. On the other hand, when the depth is too deep, the flow rate of the separation liquid inside the box becomes slow, so that stagnation may occur and SS may be deposited. When the transparency of the separation liquid is high and the measurement by the camera is easily influenced by the bottom surface, the depth may be 200 mm or more. However, since the separation liquid flow rate inside the box becomes slow, the pipe connected to the coagulated sludge extraction pump 32 so that the separation liquid residence time inside the box falls within the range of 20 to 60 seconds, preferably within the range of 20 to 40 seconds, or You may set so that the aperture of the piping connected to the dilution water supply pump 33 may be enlarged. When the pipe diameter is smaller than φ20 mm, the SS of the separation liquid may be clogged with the pipe, so it is preferable to set it so as not to clog.
The width of the container 341 is desirably about 150 mm. If the width is narrow, the side plate enters the shooting range of the camera, which is not desirable. On the other hand, if the width is too wide, the flow rate of the separation liquid inside the box becomes slow, stagnation occurs and SS may be deposited, which is not desirable.
Further, the length of the storage container 341 (in the direction toward the back in the drawing) is preferably about 150 mm. The reason is the same as in the width direction.

The camera 90 is provided above the storage container 341 and images the liquid level of the diluted agglomerated sludge 343 temporarily stored in the storage container 341. Here, the height at which the camera 90 is provided is a position higher than the height of the upper end portion of the overflow weir 342.
The camera 90 shoots in the depth direction (depth direction) of the storage container 341 in order to capture images from above the storage container 341 toward the liquid level. That is, the camera 90 captures an image of a region where the aggregated sludge (diluted aggregated sludge) can exist not only in the liquid level but also in the depth direction. In this case, the suspended substances may overlap with each other due to the presence of the coagulated sludge in the depth direction. However, since the coagulated sludge is diluted with the dilution water, the density of the coagulated sludge is reduced. Since the number of suspended substances that can be present in the camera can be reduced, it is possible to photograph in a state in which the overlapping of suspended substances is reduced. Therefore, by diluting, it is possible to shoot in a state where the overlapping of suspended substances when viewed from above in the depth direction is reduced, so that measurement errors caused by overlapping of suspended substances can be reduced. Can do. In addition, it is not always necessary to perform a process of taking a plurality of times for one measurement and calculating an average value of the area.

Here, a transparent cover may be provided between the camera 90 and the container 341. Thereby, even if the diluted agglomerated sludge 343 of the storage container 341 is splashed, the camera 90 is not directly soiled. In this case, since the cover only needs to be cleaned, maintenance is easy.
Further, since the liquid level of the camera 90 is picked up from a position at a certain distance in the height direction from the liquid level of the diluted agglomerated sludge 343, the droplets of the diluted agglomerated sludge 343 are difficult to reach the lens of the camera 90. Such a cover is not necessarily provided. In this case, dirt attached to the cover does not enter the captured image, so that measurement errors due to dirt can be eliminated.
The focal length of the camera 90 is set so as to correspond to the distance from the camera 90 to the liquid level. For this reason, the camera 90 can accurately image the liquid level of the diluted agglomerated sludge. The focal length may be fixedly set.
An illumination device that illuminates the liquid surface of the diluted agglomerated sludge 343 is disposed in the vicinity of the camera 90.

  The discharge part 348 is provided in the lower part of the storage container 341 and has an open / close valve that opens and closes based on an instruction from the control panel 70. Further, the discharge unit 348 opens the open / close valve according to a control signal supplied from the control panel 70 in accordance with the discharge timing, thereby discharging the diluted agglomerated sludge 343 temporarily stored in the storage container 341 to the outside of the storage container 341. .

3 and 4 are diagrams illustrating a case where the liquid level of the container 341 is imaged by the camera 90. FIG. Here, FIG. 3 represents the case where dilution water is not added to the coagulated sludge, and FIG. 4 represents the case where dilution water is added to the coagulated sludge.
3A is a cross-sectional view of the aggregated sludge monitoring box 34 as viewed from the side, and FIG. 3B is a diagram of the liquid level of the diluted aggregated sludge 343 as viewed from the upper side in the vertical direction. It is. In FIG. 3A, the camera 90 images the liquid level of the coagulated sludge 346 stored in the storage container 341. In this case, when imaging the liquid level, the camera 90 images from the upper side to the lower side of the storage container 341, so the image is taken in the depth direction of the diluted agglomerated sludge 343. At this time, when the coagulated sludge in the storage container 341 is somewhat turbid or the SS is floating, as shown in FIG. 3B, suspended substances (aggregated sludge) present on the liquid surface A lot of SS or suspended matter existing below the liquid level will be imaged, so that the suspended matter present on the liquid level is a single mass or exists on the liquid level. It is difficult to identify whether or not an image is captured as if it is a large mass, because the SS floating below the liquid surface (in the depth direction) is imaged with respect to the suspended solids that are adjacent to each other. It becomes a state. Then, when detecting the area of the suspended matter existing on the liquid surface, a detection error occurs.

  Therefore, in this embodiment, the aggregated sludge is diluted by adding dilution water to the aggregated sludge in the storage container 341. Thereby, as shown to Fig.4 (a), when the liquid level of the storage container 341 is imaged from the camera 90, since the coagulated sludge is diluted, the amount of SS existing below the liquid level is When compared with the case of not being diluted (for example, FIG. 3 (a)) In addition, the distance in the depth direction from the suspended substance existing on the liquid surface to the SS existing below the liquid surface tends to be larger than that in the case where the liquid is not diluted. Therefore, the amount of SS imaged at a position adjacent to the suspended matter existing on the liquid surface can be reduced. Further, even if the SS existing below the liquid surface is imaged, the SS floating at a position close to the liquid surface is reduced as compared with the case where the aggregated sludge is not diluted. Since there are few SSs in the vicinity and near the liquid level of the coagulated sludge, the SS is a suspended substance existing on the liquid level or floating below the liquid level from the image captured by the camera 90. It becomes easy to identify. That is, for example, as will be described later, as the distance in the depth direction (depth direction) between the suspended matter present on the liquid surface and the SS floating below the liquid surface increases, the suspended material present on the liquid surface. And the SS floating below the liquid surface tends to increase, and as the distance between the SS floating below the liquid surface and the liquid surface in the depth direction (depth direction) increases, the camera increases. The color of the SS component viewed from the 90 side is easily affected by the color of the liquid component of the diluted agglomerated sludge 343. Furthermore, since the number of SSs floating below the liquid level is small, it is possible to reduce the fact that SS floating below the liquid level is measured as a suspended substance existing on the liquid level.

FIG. 5 is a schematic block diagram for explaining a part of the functions of the control panel 70, the camera 90, and the computer 80. FIGS. 6 and 7 are diagrams illustrating an example of image data captured by the camera 90. FIG.
The control panel 70 includes a storage unit 701, a determination unit 702, and a control unit 703. The camera 90 includes an area detection unit 901, a contour detection unit 902, and a storage unit 903. The computer 80 has a setting unit.
In the control panel 70, the storage unit 701 previously stores a reference range (described later) in the relationship between the color area of SS (floating solid) and the detected contour value (total perimeter) of SS. Here, data indicating a reference range in the relationship between the SS color area determined as shown in FIG. 8 (or FIG. 9) described later and the SS contour detection value is stored.
The determination unit 702 refers to the data stored in the storage unit 701 to compare the relationship between the area of the suspended substance and the outline of the suspended substance and the reference range.
The determination unit 702 refers to the data stored in the storage unit 701 for a comparison between the value obtained by dividing the area of the suspended solids by the perimeter and the reference range.

The control unit 703 controls the addition amount of the flocculant added by the flocculant supply pump 10 (flocculant addition unit) based on the relationship between the area of the suspended solid and the outline of the suspended solid.
When the area of the suspended solid is less than the reference area, the control unit 703 decreases the amount of the flocculant added.
Based on the comparison result of the determination unit 702, the control unit 703 determines that the value based on the relationship between the area of the suspended substance and the outline of the suspended substance is below the reference range (or may be less than the reference range). Increases the addition amount of the flocculant, and decreases the addition amount of the flocculant when the value based on the relationship between the area of the suspended solid and the outline of the suspended solid exceeds the reference range.
The control unit 703 controls the addition amount of the flocculant added by the flocculant supply pump 10 (flocculant addition unit) based on the comparison result of the determination unit 702.

The control unit 703 includes a dilution water supply control unit 7031, a sludge supply control unit 7032, and an agglomerated sludge discharge control unit 7033.
The dilution water supply control unit 7031 controls the supply amount to supply the dilution water to the storage container 341 of the coagulated sludge monitoring box 34 by outputting a drive signal to the dilution water supply pump 33 according to the measurement result of the sludge concentration meter 21. To do.
The sludge supply control unit 7032 controls the supply amount of the aggregated sludge supplied to the storage container 341 by outputting a drive signal to the aggregated sludge extraction pump 32 according to the measurement result of the sludge concentration meter 21.
Here, the control unit 703 agglomerates so that the concentration of the diluted agglomerated sludge 343 in the storage container 341 is lower than the agglomerated sludge supplied from the mixing tank 30 and is in a predetermined range. Control is performed to increase or decrease the supply amount of at least one of the sludge extraction pump 32 and the dilution water supply pump 33. The density in the predetermined range may be stored in advance in the storage unit 701 as a density reference range, for example. Here, the control unit 703 sets the concentration reference range from 100 mg / L to 1000 mg / L, and adjusts the concentration sludge extraction pump 32 or the dilution water supply pump 33 so that the concentration in the container 341 falls within this concentration reference range. Control the supply to increase or decrease. The concentration reference range may be 100 mg / L to 1000 mg / L, but is more preferably set to 300 mg / L to 600 mg / L. Here, when the supply amount of the dilution water supplied by the dilution water supply pump 33 is a fixed amount (when it is a fixed value), the control unit 703 determines the aggregated sludge extraction pump 32 according to the measurement result of the sludge concentration meter 21. When the extraction amount of the coagulated sludge extraction pump 32 is a constant amount (when it is a fixed value), the dilution water supply pump 33 supplies it according to the measurement result of the sludge concentration meter 21. You may control to increase / decrease the supply amount of the dilution water to perform.
Further, the supply amount of the dilution water supply pump 33 and the coagulated sludge extraction pump 32 may be a volume supplied per unit time or a supply volume.
Aggregated sludge discharge control unit 7033 performs control to open or close the open / close valve by outputting a control signal to the open / close valve provided in discharge unit 348 of storage container 341. Further, the aggregated sludge discharge control unit 7033 opens the opening / closing valve, discharges the diluted aggregated sludge 343 accommodated in the storage container 341, closes the opening / closing valve when the discharge is completed, and then the aggregated sludge extraction pump via the supply path. By storing the coagulated sludge supplied from the storage container 341 in the storage container 341, the diluted coagulated sludge in the storage container 341 is replaced. Even when this replacement is performed, the coagulated sludge is diluted by supplying dilution water according to the measurement result of the sludge concentration meter 21.
In addition, the replacement of the diluted agglomerated sludge in the storage container 341 is performed by supplying diluted water supplied from the dilution water supply pump 33 or the agglomerated sludge supplied from the agglomerated sludge extraction pump 32 to the storage container 341 for a certain period of time. You may carry out by making the dilution aggregation sludge in the container 341 overflow.

As a preprocessing, the camera 90 extracts a target area to be processed from all areas of the image of the image data obtained by the imaging function. For example, from the image data captured by the camera 90, the inner peripheral side of a circle having a predetermined radius with respect to the center position of the imaging region is extracted as the target region 100 (FIG. 6).
In the camera 90, the area detection unit 901 detects the area of the suspended matter present in the separation liquid from the imaging data obtained from the camera 90.
The contour detection unit 902 detects the contour of the suspended substance present in the separation liquid from the imaging data obtained from the camera 90.
The contour detection unit 902 is a pixel that can form a contour when the difference between the pixel value of the pixel corresponding to the suspended substance in the imaging data and the pixel value of the pixel corresponding to the substance other than the suspended substance is greater than or equal to a certain value. Detect as.
The contour detection unit 902 obtains the perimeter of adjacent pixels among a plurality of pixels detected as pixels that can form the contour. Here, when there are a plurality of groups of pixels of the suspended matter detected as the color area in the target region, the contour detection unit 902 obtains the respective perimeters and obtains the total perimeter that is the sum of them. For example, when there are a plurality of masses of suspended solids, the sum of the perimeters is obtained.

Next, the camera 90 refers to the pixel value of each pixel in the target area 100 and determines for each pixel whether or not the pixel corresponds to the suspended matter.
The determination of whether or not the substance is a suspended substance is performed by conducting an experiment in advance so that the operator of the sludge concentration system 1 confirms the image data actually captured by the camera 90 and the actual liquid level of the diluted agglomerated sludge 343. Then, a worker sets a pixel value that is a criterion for determining whether or not to make a suspended substance. For example, for the hue, saturation, and brightness of the pixels in the image data, ranges to be included as suspended substances are determined, and are written and stored in the storage unit 903 as reference ranges.
Whether the area detection unit 901 refers to the color (pixel value) of each pixel of the target region 100 and the pixel value corresponding to the suspended substance is within the reference range stored in the storage unit 903. A determination is made based on whether or not the substance is in the reference range, and the substance is determined as a suspended substance. This determination is performed for each pixel.
That is, when the diluted agglomerated sludge 343 is imaged, the area detecting unit 901 displays the color of the suspended agglomerated sludge 343 stored in the above-described storage unit 903 (hue, saturation). , Brightness) based on the area of the target area in the shooting range, the ratio of the area of the pixel corresponding to the color of the SS component set in advance (hereinafter also referred to as color area) (unit:%, for example) Detect whether to do. For example, the SS density is higher as the color area ratio of the detected SS component is larger, and the SS density is lower as the color area ratio is smaller.
Here, the ratio of the color area can be obtained by using the master image in addition to the method of obtaining the area of the pixel corresponding to the color of the SS component with respect to the area of the target region. Here, the master image is used as the master image by obtaining the area of the pixel corresponding to the SS component for an image in which some pixels corresponding to the SS component exist in the image data obtained by photographing the diluted agglomerated sludge 343. Then, the ratio of the area of the pixel corresponding to the SS component in the target area of the image data to be determined to the area of the pixel corresponding to the SS component in the master image may be obtained. When the master image is used, a larger value is obtained as compared with the case where the master image is not used.

Here, the SS concentration of the diluted agglomerated sludge 343 can be measured by the color area. However, when the SS concentration is increased, the cause is due to insufficient addition of the aggregating agent or the addition of the aggregating agent. It is not possible to determine from the SS concentration alone whether it is due to excess of water or whether the operation in the sludge concentration system 1 is not appropriate.
The contour detection unit 902 sets the boundary line as a contour based on the color contrast between the pixel specified as the color area of the image data and the pixel adjacent to the pixel and not specified as the color area. If it is determined that the contour is to be used, the number of pixels of the contour is measured as a contour detection value. The criterion for determining whether or not to use the contour can use contrast. For example, a pixel specified as the color area of the image data and a pixel that is adjacent to the pixel and is not specified as the color area If the difference between the pixel values is equal to or greater than the reference contrast value, it is determined to be an outline, and if it is less than the reference contrast value, it is determined not to be an outline. The reference contrast value can be arbitrarily set based on the property of the object to be handled, the operation standard, and the like. When the reference contrast value is set to a large value, the sensitivity is set low because it is detected as a contour when the pixel value difference between the suspended matter determined to be the color area and its surroundings (background) is large. When the reference contrast value is set to a small value, the contour is detected even if the difference between the pixel values of the suspended matter determined to be the color area and the surrounding (background) is small. Therefore, the sensitivity can be set high. Such a reference contrast value is stored in the storage unit 903.
The contour detection unit 902 counts the number of connected pixels when the pixels detected to be contours are connected so as to be adjacent to each other and surround the pixels of the suspended solids determined as the color area. To measure the perimeter. Here, even if some of the pixels are not connected, as long as the number of pixels that are separated is equal to or less than a predetermined number, the perimeter may be measured even if it is regarded as a contour.

Here, when the injection rate of the flocculant is insufficient, the aggregated sludge grains formed in the mixing tank 30 become small and some of them are not agglomerated and suspended in the aggregated sludge as sludge particles. The agglomerated sludge is charged into the agglomerated sludge monitoring box 34 by the agglomerated sludge extraction pump 32, diluted with dilution water, and stored as a diluted agglomerated sludge 343. The diluted agglomerated sludge 343 is a state in which the particles of the agglomerated sludge are small and fine sludge particles are suspended in the same manner as the original agglomerated sludge. Therefore, the pixel determined as the color area and the color area adjacent to the pixel The difference in pixel value from the pixel that has not been determined as is less than the reference contrast value. As a result, the contour detector 902 cannot detect the contour even if the SS concentration in the diluted agglomerated sludge 343 is high.
On the other hand, when the injection rate of the flocculant is more than appropriate, since the particles of the diluted agglomerated sludge 343 are large and the fine sludge particles are not suspended, the contour detection unit 902 can detect the contour of the SS. it can.
Therefore, when the value of the total perimeter detected as a contour is small with respect to the color area of the diluted agglomerated sludge 343, it can be determined that the coagulant is insufficient, and when the value of the total perimeter is large, It can be determined that the agent is excessive or the operating conditions of the concentrator are not appropriate.

FIG. 6 is an image after image processing is performed on imaging data obtained by imaging the liquid level of the diluted agglomerated sludge 343 when the injection rate of the aggregating agent with respect to the sludge is appropriate. Here, an image in the case where the camera 90 detects the color area corresponding to the suspended matter for the target region 100 is shown. FIG. 6A shows an image after the area detection unit 901 determines the color area. Here, the flocculant remaining in the diluted agglomerated sludge 343 reacts with SS to be re-agglomerated, and the suspended substance (for example, reference numeral 101) present in the liquid surface portion of the separation liquid 405 is determined as the color area. In this figure, a plurality of parts detected as such a color area are detected in the target area. Reference numeral 102 denotes an image of a portion of the illumination device where the illumination light is reflected, but such a pixel is not detected as a color area because it does not fall within the reference range of the pixel that is the target of the color area. .
FIG. 6B illustrates an image after the contour detection unit 902 detects the contour of the image in which the color area is detected. Here, a plurality of detected contours (reference numeral 110) are detected in the target region.
As described above, when the injection rate of the flocculant is appropriate, the total perimeter as the contour also increases / decreases as the color area increases / decreases. Therefore, the number of color areas with respect to the total perimeter (color area ÷ total perimeter) is a low value to some extent.

  FIG. 7 is an image after image processing is performed on imaging data obtained by imaging the liquid level of the diluted agglomerated sludge 343 when the injection rate of the aggregating agent to the sludge is insufficient. Here, an image in the case where the computer 80 detects the color area corresponding to the suspended matter for the target region 100 is shown. FIG. 7A shows an image after the area detection unit 901 determines the color area. Here, since the flocculant hardly remains in the diluted flocculated sludge 343, it does not re-aggregate with SS. Therefore, the SS floats as fine particles on the liquid surface side of the diluted agglomerated sludge 343, and as a result, suspended substances (for example, reference numeral 101) present on the liquid surface part of the diluted agglomerated sludge 343 are determined as the color area. On the other hand, even in a pixel that is not determined as the color area, the pixel exists as a pixel having a value close to the pixel determined as the color area, and the contrast is less than the reference contrast value. Therefore, as shown in FIG. 7B, the contour is hardly detected even though the number of pixels detected as the color area is large. Therefore, when the injection rate of the flocculant is insufficient, the value of the color area is large, and the total perimeter of the detected contour is low despite a large amount of SS leaking into the separation liquid 405. The number of color areas relative to the total perimeter (color area / total perimeter) is a larger value than when the injection rate is appropriate.

Data such as the color area, the perimeter, and the addition amount of the flocculant is accumulated in various scenes, and the control unit 703 controls the addition amount of the flocculant by using this data.
FIG. 8 is a diagram illustrating the relationship between the color area and the total perimeter.
In this figure, the horizontal axis represents the SS color area, and the vertical axis represents the SS contour detection value (total perimeter). A curve indicated by reference numeral 300 represents a case where the addition amount of the flocculant is the first value, and a curve indicated by reference numeral 310 represents a case where the addition amount is larger than the first value and is an appropriate addition amount. The curve indicated by reference numeral 320 represents a case where the addition amount is larger than the second value and is an appropriate addition amount. These code 300, code 310, and code 311 collect color area values and contour detection values at different addition amounts, and the obtained measurement results are used as color area values on the horizontal axis and contour detection values on the vertical axis. It is a curve obtained by plotting as an approximate curve.
The curve indicated by reference numeral 300 represents a case where the amount of the flocculant added is insufficient and is not re-aggregated in the separation liquid 405. Therefore, even if the SS color area is increased, the contour is almost the same. Since it is not detected, the graph is almost flat.
On the other hand, the curves indicated by reference numerals 310 and 320 have a relationship in which the SS contour detection value increases as the numerical value of the SS color area increases. This is because the addition amount of the flocculant is appropriate, and the flocculant reacts with SS in the separation liquid 405 to reaggregate. Therefore, the detected contour increases as the color area increases, so the total perimeter increases. There is a tendency.
In this embodiment, in this way, data of color area values and contour detection values at different addition amounts are collected, and based on the results, a value that is an appropriate addition amount is determined in advance, Used to control the amount added. Here, each of the curves shown by reference numerals 310 and 320 represents a case where the addition amount of an appropriate flocculant is shown, but as to which case is used for controlling the addition amount of the flocculant, sludge concentration is used. What is necessary is just to select based on the property of the sludge supplied to the system 1 as a to-be-processed object, a driving | operation standard, etc. For example, the case where the addition amount of the flocculant in the case indicated by reference numeral 310 is used for control as a value that provides an appropriate addition amount will be described as an example.
Here, a certain range is defined as a reference range with reference to the curve indicated by reference numeral 310. For example, the reference range is ± 20%, preferably ± 10% of the value indicated by this curve, and the injection rate is controlled so as to be within that range. The curve indicated by reference numeral 311 represents the upper limit value of the reference range, and the curve indicated by reference numeral 312 represents the lower limit value of the reference range.

FIG. 9 is a diagram illustrating the relationship between the color area and the value obtained by dividing the color area by the total perimeter. FIG. 9 shows a case where the vertical axis represents the value obtained by dividing the color area by the detected contour value in the measurement result shown in FIG. 8, and the horizontal axis represents the color area in the measurement result shown in FIG. With respect to the reference range described with reference to FIG. 8, the case where the reference range is defined in the relationship between the color area and the contour detection value has been described. In this way, the value obtained by dividing the color area by the contour detection value and the color area The reference range may be determined in the relationship.
Here, the straight line indicated by reference numeral 350 has a relationship corresponding to the curve indicated by reference numeral 300 in FIG. 8 (the same amount of flocculant is added), and the straight line indicated by reference numeral 360 corresponds to the curve indicated by reference numeral 310 in FIG. The relationship (the same amount of coagulant is added), and the straight line indicated by reference numeral 370 is the relationship corresponding to the curve indicated by reference numeral 320 in FIG. For example, when the straight line indicated by reference numeral 360 is used for controlling the addition amount of the flocculant, a predetermined range (± 20%, preferably ± 10%) can be determined as the reference range with reference to the straight line indicated by reference numeral 360. . The curve indicated by reference numeral 361 represents the upper limit value of the reference range, and the curve indicated by reference numeral 362 represents the lower limit value of the reference range.

  Note that the setting unit 801 of the computer 80 can also perform various settings of the camera 90. For example, the illumination brightness of the lighting device, focus, shooting frequency, registration of reference image, detection range, detection content setting (color area, contour detection, etc.), and the color to be detected (hue, (Saturation, lightness) is set according to the content operated by the operator from an input device such as a keyboard or a mouse. When contour detection is used, the sensitivity for detecting the contour can also be set.

Among the configurations described above, the diluted sludge imaging system may be configured to include the functions of the storage container 341, the diluted water supply pump 33, and the camera 90, and the sludge concentration meter 21 and the diluted water supply control unit 7031 are further included. The diluted sludge imaging system may be configured to include at least one of the sludge concentration meter 21, the sludge supply control unit 7032, and the aggregated sludge discharge control unit 7033.
Further, the flocculant addition amount control system may be configured so that the diluted sludge imaging system includes the functions of the area detection unit 901, the contour detection unit 902, the determination unit 702, and the control unit 703.
Further, the functions of the area detection unit 901, the contour detection unit 902, and the storage unit 903 may be provided in the control panel 70 or may be provided as functions of the computer 80.

FIG. 10 is a flowchart for explaining the operation of the sludge concentration system 1.
The control unit 703 of the control panel 70 determines whether or not the replacement timing in the storage container 341 of the coagulated sludge monitoring box 34 has arrived (step S10). A predetermined time is set as the replacement timing, and it is determined by referring to the value of the timer included in the control unit 703 whether or not the set time has come. Here, if the replacement timing has not arrived, the process of step S11 is skipped and the process proceeds to step S12. If the replacement timing has arrived, the process of step S11 is executed. In step S11, the control unit 703 outputs a control signal for opening the valve to the open / close valve of the discharge unit 348 from the coagulated sludge discharge control unit 7033, thereby opening the open / close valve and diluting and coagulating stored in the storage container 341. Sludge 343 is discharged. In addition, although the exchange in the storage container 341 in this step S11 was demonstrated about the case where it replaces by opening and closing an opening-and-closing valve and discharging | emitting the diluted aggregation sludge 343 stored in the storage container 341, exchange is an opening-and-closing valve. You may make it carry out by the method different from the method of discharging | emitting the diluted aggregation sludge 343 using this. For example, in the replacement, the dilution water supplied from the dilution water supply pump 33 or the coagulation sludge supplied from the coagulation sludge extraction pump 32 is supplied to the storage container 341 for a certain time, and the dilution coagulation sludge in the storage container 341 overflows. You may make it carry out. In this case, step S11 may be skipped and the process may proceed to step S12. Further, for this replacement, the supply of dilution water from the dilution water supply pump 33 and the supply of coagulated sludge from the coagulated sludge extraction pump 32 may be performed at an arbitrary timing.

In step S12, the control unit 703 acquires the concentration measurement result from the sludge densitometer 21 (step S12), and supplies dilution water depending on whether or not the acquired concentration value is within the concentration reference range. The amount is determined (step S13). For example, when the concentration value is higher than the concentration reference range, the dilution water supply control unit 7031 increases the supply amount of the dilution water. Here, the supply amount may be determined such that the higher the degree that the concentration value exceeds the concentration reference range, the greater the increase amount of the dilution water supply amount. Further, the supply amount may be determined so as to decrease the supply amount of the coagulated sludge by the sludge supply control unit 7032, and the higher the degree that the value of the concentration exceeds the concentration reference range, the supply of the coagulated sludge. The supply amount may be determined so as to reduce the amount. Here, the supply amount of the dilution water from the dilution water supply pump 33 is relatively increased with respect to the extraction amount of the coagulated sludge extraction pump 32, and it may be controlled so as to proceed to the dilution tendency.
Here, the inside of the container 341 is agitated by supplying dilution water. Thereby, even if dilution water is supplied, the density | concentration in the storage container 341 tends to become uniform. The measurement accuracy can be increased by making the concentration after dilution uniform.

When the supply amount of the dilution water is determined, the control unit 703 controls the dilution water supply pump 33 so as to be the determined supply amount of the dilution water (step S14).
Thereafter, the control unit 703 waits until a certain wait time elapses (step S15), and proceeds to step S101. Here, by waiting until a certain waiting time elapses, it is possible to wait until the concentration of the diluted agglomerated sludge 343 in the container 341 becomes uniform. In addition, the diluted agglomerated sludge 343 overflows to some extent from the overflow weir 342 of the storage container 341, so that the liquid level can be stabilized.

When a certain weight time has elapsed, the camera 90 images the liquid level of the diluted agglomerated sludge 343 (step S101). The area detector 901 of the camera 90 detects the color area based on the captured image data (step S102). When the color area is detected, the contour detection unit 902 detects the contour of the suspended matter detected as the color area (step S103), and detects the perimeter of the detected contour (step S104). Here, when the color area is detected at multiple locations in the target area of the image data, the total perimeter is detected by calculating the sum of the perimeters of the respective outlines of the suspended matter detected as the color area. To do.
When the perimeter is detected, the determination unit 702 refers to the data of the reference range stored in the storage unit 701 and compares the value of the perimeter (contour detection value) with respect to the color area and the reference range. (Step S105).
Based on the comparison result of the determination unit 702, the control unit 703 maintains the addition amount of the flocculant supplied by the flocculant supply pump 10 when the value of the perimeter (contour detection value) with respect to the color area is within the reference range. (Step S106). Thereafter, after a certain waiting time elapses, the process proceeds to step S10.

  On the other hand, when the perimeter length value for the color area is outside the reference range, the determination unit 702 compares the perimeter length value for the color area with the lower limit value of the reference range (step S107). The control unit 703 increases the supply amount of the coagulant supplied from the coagulant supply pump 10 when the value of the perimeter for the color area is less than the lower limit value of the reference range in the comparison result of the determination unit 702 ( Step S108). Here, for example, a plurality of different levels specifying the supply amount of the flocculant supplied from the flocculant supply pump 10 is set in advance, and the control unit 703 is more than the current level among the plurality of levels. A control signal is output to the coagulant supply pump 10 so as to increase the level by one so that the supply amount of the coagulant increases. The flocculant supply pump 10 supplies the flocculant by increasing the supply amount of the flocculant by one stage. Thereby, the supply amount of the flocculant supplied from the flocculant supply pump 10 increases, and the amount of the flocculant that can react in the mixing tank 30 increases. After step S107, after a certain wait time elapses, the process proceeds to step S10.

  On the other hand, in the comparison result of the determination unit 702, the control unit 703 determines that the perimeter length value for the color area is not the lower limit value of the reference range, that is, the perimeter length value for the color area exceeds the upper limit value of the reference range. First, the supply amount of the flocculant supplied from the flocculant supply pump 10 is decreased (step S109). Here, for example, the control unit 703 outputs a control signal to the flocculant supply pump 10 so as to lower one of the plurality of levels so that the supply amount of the flocculant is lower than the current level. . The flocculant supply pump 10 supplies the flocculant in such a manner that the supply amount of the flocculant is reduced by one stage. Thereby, the supply amount of the flocculant supplied from the flocculant supply pump 10 decreases, and the amount of the flocculant that can react in the mixing tank 30 tends to decrease. After step S109, after a predetermined time has elapsed, the process proceeds to step S10.

  In step S10, the control unit 703 determines whether or not the replacement timing has come. If the replacement timing has come, the control unit 703 temporarily stops driving the dilution water supply pump 33 and the coagulated sludge extraction pump 32. Then, all the diluted agglomerated sludge 343 in the storage container 341 is discharged by opening the opening / closing valve of the discharge unit 348, and the replacement process is performed by closing the opening / closing valve, and the process proceeds to step S12. Here, after the flocculant supply amount is controlled in step S108 and step S109, even if the flocculant supply amount increases or decreases, the flocculant supply amount is controlled. After the flocculent sludge reaches the storage container 341, the replacement process can be performed. As a result, the flocculant sludge after the supply amount of the flocculant is changed is introduced into the storage container 341. The liquid level can be imaged by the camera 90.

In the embodiment described above, the color area and the contour may be detected using only one of the image data captured in step S101. However, in the image data of the past predetermined period of the captured image data. The determination unit 702 may compare the detected average values of the color areas and the detected contour values, and the control unit 703 may perform control based on the comparison result. For example, a moving average may be obtained for past image data of about 10 minutes, and the determination by the determination unit 702 and the control by the control unit 703 may be performed. Also, depending on the shooting conditions of the camera, these detection values may fluctuate greatly depending on whether or not the SS is floated within the imaging range of the camera 90. In such a case, The determination accuracy of the determination unit 702 can be improved by using the latest past average value (moving average or the like).
Further, the determination unit 702 is not limited to the determination in step S105 and step S107 in the flowchart of FIG. 10, and compares the upper limit value of the reference range stored in the storage unit 701 with the value of the perimeter for the color area, and then Alternatively, the determination may be made by comparing the lower limit value of the reference range stored in the storage unit 701 with the value of the perimeter for the color area. Alternatively, the lower limit value of the reference range stored in the storage unit 701 is compared with the value of the perimeter for the color area, and then the upper limit value of the reference range stored in the storage unit 701 and the perimeter of the color area. You may determine by contrasting with a value.

In the above-described embodiment, the mixing tank 30 may be a line mixer, or the line mixer and the mixing tank 30 may be combined. The agglomerated sludge formed by mixing the sludge and the aggregating agent is introduced from the upper part of the vertical filtration concentrator 40 and separated into solid and liquid via the filtration screen 402. The camera 90 images the liquid surface of the separation liquid 405, and thereby, the color area of SS and the outline (size) of SS contained in the separation liquid 405 are measured. If the water quality (SS concentration) of the separation liquid is good, it can be determined that the SS color area is small and the solid-liquid separation of sludge is efficiently performed.
As described above, whether the aggregation is good or bad is determined by the SS concentration of the separation liquid and the SS contour (size). The relationship (curve) between the SS color area and the SS contour detection value at the optimum injection rate of the flocculant is previously determined. By grasping, the injection rate of the flocculant may be automatically adjusted so that the optimum curve is within the range of ± 20%, preferably ± 10%. The optimum curve may be an approximate straight line of “SS color area” and “SS color area / SS contour detection value”.
When the actually measured result falls within the optimum curve ± 20%, preferably ± 10%, the injection rate of the flocculant is maintained.

However, when the measured result falls below the range of the optimal curve ± 20%, preferably ± 10% (when using the approximate line of “SS color area” and “SS color area / SS contour detection value”) ), The coagulant injection rate is judged to be insufficient, and the coagulant supply pump speed is increased by one step to increase the coagulant injection rate. Note that the amount of increase per step of the flocculant supply pump can be arbitrarily set.
When the actual measurement result exceeds the range of the optimal curve ± 20%, preferably ± 10% (lower than the approximate line of “SS color area” and “SS color area / SS contour detection value”) ), The coagulant injection rate is judged to be excessive, and the rotation speed of the coagulant supply pump is decreased by one step to decrease the coagulant injection amount. Note that the amount of reduction per stage of the flocculant supply pump can be arbitrarily set.
The SS color area and SS contour of the separation liquid are always measured continuously, but after increasing or decreasing the amount of flocculant injected, about 10 to 20 minutes considering the residence time of the mixing tank and concentrator. After the waiting time elapses, it may be determined again whether the injection of the flocculant is insufficient or appropriate, and the supply amount of the flocculant may be controlled.
Since the SS concentration of the separation liquid temporarily rises during the cleaning process of the vertical filtration concentrator, this control is not performed for about 10 minutes during the cleaning process and after the cleaning process.
As described above, since the injection rate of the flocculant is automatically controlled so as to be optimal, the SS recovery rate of the vertical filtration concentrator is maintained high, and the amount of the flocculant used can be reduced.

  In addition, the supply amount of the flocculant supplied from the flocculant supply pump 10 is set as a plurality of levels in advance as the supply level, and the value of the perimeter (contour detection value) for the color area deviates from the reference range. The supply level according to the degree may be determined.

Next, a second embodiment will be described.
In the first embodiment, the aggregated sludge branched from the route for supplying the aggregated sludge from the mixing tank 30 to the vertical filtration concentrator 40, that is, the aggregated sludge before solid-liquid separation is supplied to the aggregated sludge monitoring box 34. Although the case where it introduces was demonstrated, in 2nd Embodiment, the case where the separated liquid after solid-liquid separation is introduce | transduced into the aggregation sludge monitoring box 34a is demonstrated. Here, since the separated liquid after the solid-liquid separation contains not only moisture but also agglomerated sludge, in the second embodiment, the separated liquid is diluted with diluted water, and the liquid level is reduced. Take a picture with the camera.

FIG. 11 is a schematic configuration diagram of the sludge concentration system 1a according to the second embodiment. About the part which is not shown by this figure, since the structure is the same as the sludge concentration system 1 in 1st Embodiment, illustration and its description are abbreviate | omitted and the structure different from 1st Embodiment is demonstrated.
In the first embodiment, the aggregated sludge branched from the route for supplying the aggregated sludge from the mixing tank 30 to the vertical filtration concentrator 40, that is, the aggregated sludge before solid-liquid separation is supplied to the aggregated sludge monitoring box 34. Although the case where it introduces was demonstrated, in 2nd Embodiment, the case where the separated liquid after solid-liquid separation is introduce | transduced into the aggregation sludge monitoring box 34a is demonstrated. Here, since the separated liquid after the solid-liquid separation contains not only moisture but also agglomerated sludge, in the second embodiment, the separated liquid is diluted with diluted water, and the liquid level is reduced. Take a picture with the camera.
In the first embodiment, the case where the vertical filtration concentration device 40 is used as the solid-liquid separation device has been described. However, in the second embodiment, the vertical filtration concentration device is particularly suitable as long as it is a solid-liquid separation device. A decanter type centrifugal dehydrator, a screw press type dehydrator, a belt press type dehydrator or the like may be used.

The solid-liquid separator 40a used in this embodiment performs solid-liquid separation of the coagulated sludge supplied from the mixing tank 30. The separation liquid discharged from the solid-liquid separation device 40a is discharged from the discharge path of the solid-liquid separation apparatus 40a, and a part of the separation liquid is branched from the discharge path, and the aggregated sludge is separated by the separation liquid supply pump 32a. It is supplied to the monitoring box 34a.
The separation liquid supply pump 32a supplies the separation liquid to the coagulated sludge monitoring box 34a in accordance with a control signal output from the control unit 703 of the control panel 70. The supply amount of the separation liquid supplied by the separation liquid supply pump 32 a may be determined by inverter control based on a drive signal supplied from the control panel 70. The separation liquid supply pump 32 a may be turned on / off based on a drive signal supplied from the control panel 70. In this case, the supply amount of the coagulated sludge supplied by the separation liquid supply pump 32a is constant.
The dilution water supply pump 33a supplies dilution water to the coagulated sludge monitoring box 34a. The dilution water supply pump 33a basically has the same function as the dilution water supply pump 33 in the first embodiment, except that the destination for supplying dilution water is the coagulated sludge monitoring box 34a.
The agglomerated sludge monitoring box 34a has the same configuration as that of the agglomerated sludge monitoring box 34 in the first embodiment, but branches from a route for supplying the agglomerated sludge from the mixing tank 30 to the vertical filtration concentrator 40 as described above. Instead of the agglomerated sludge, the separated liquid after solid-liquid separation in the solid-liquid separation device 40a is supplied.
The control unit 703 of the control panel 70 outputs a drive vibration to the separation liquid supply pump 32a or the dilution water supply pump 33 according to the measurement result of the sludge concentration meter 21, so that the concentration of the diluted separation liquid 343a in the storage container 341a is increased. Control to be within the density reference range. Here, although the sludge concentration meter 21 is provided in the latter stage of the sludge supply pump 20, in this embodiment, you may make it provide in the path | route which discharges | emits the separated liquid of the solid-liquid separator 40a.
The storage container 341a stores and temporarily stores the separation liquid supplied from the separation liquid supply pump 32a and the dilution water supplied from the dilution water supply pump 33a. The separation liquid and dilution water stored in the storage container 341a are mixed in the storage container 341a, so that the separation liquid is diluted with the dilution water and temporarily stored as the diluted separation liquid. When the liquid level of the diluted separated liquid exceeds the overflow weir 342a, it overflows and is discharged out of the system.
The discharge unit 348a can store or discharge the diluted separation liquid stored in the storage container 341a by opening and closing the open / close valve in accordance with a control signal from the control unit 703.
The camera 90 a is provided above the storage container 341 a, images the liquid level of the separation liquid temporarily stored in the storage container 341 a, and outputs image data as an imaging result to the control panel 70.

The concentration of SS in the separation liquid is generally about several tens mg / L to 1500 mg / L. If the concentration of the separation liquid does not need to be diluted, it is possible to take an image directly with the camera 90a without supplying dilution water. On the other hand, when the concentration of the separation liquid is a high value exceeding the concentration reference range, the control unit 703 supplies the separation liquid in the storage container 341a by supplying the dilution water with the dilution water supply pump 33a. Dilute.
Similar to the first and second embodiments, the control panel 70 detects the color area and the contour based on the image data, and controls the supply amount of the flocculant based on the detection result.

  According to the second embodiment, the diluted sludge imaging system can be imaged with respect to the separated liquid after solid-liquid separation, and the supply amount of the flocculant can be controlled. Further, the diluted sludge imaging system can be applied not only to the vertical filtration and concentration device but also to other solid-liquid separation devices.

In the first and second embodiments described above, a compressed air supply duct that blows compressed air on the imaging surface of the camera 90 or the camera 90a may be provided. Thereby, even if moisture (spray etc.) may arise from the liquid stored in the storage container and adhere to the imaging surface of the camera 90 or the camera 90a, it can be removed.
The compressed air supply duct includes a dehumidified compressed air pipe and a solenoid valve, supplies compressed air at regular intervals by a timer, and performs cleaning by blowing off water droplets on the lens surface of the camera 90. Also good.

  Further, according to the first and second embodiments, the liquid stored in the storage container overflows over the overflow weir and is then captured by the camera 90 or the camera 90a, so that the liquid is stored from the camera 90 or the camera 90a. The distance to the liquid level of the container can be kept constant. Thereby, the measurement error due to the out of focus can be reduced. In addition, stagnation may occur on the liquid level of the storage container, and if an image is taken with a camera in a state where the SS component does not flow while floating, it may cause measurement errors. However, stagnation is eliminated by shooting after overflowing. Can be taken. Thereby, it is possible to photograph the suspended substance existing on the liquid surface after eliminating the starch, so that the measurement error can be reduced.

  Further, according to the first and second embodiments described above, it is necessary to measure agglomerated sludge in a state in which the instrument and an object to be measured (sludge etc.) are in direct contact with each other like an ultrasonic densitometer or an optical densitometer. Therefore, it is not necessary to store an object to be measured in a transparent container and perform measurement through the transparent container, and measurement errors due to contamination of the instrument and the container can be eliminated.

  Moreover, according to the 1st and 2nd embodiment demonstrated above, in the process of concentrating sludge with a solid-liquid separator, the excessive addition of a flocculant can be prevented. As a result, the flocculant can be controlled to a supply amount that matches the properties of the object to be processed, and it is possible to reduce the waste of adding the flocculant, thereby reducing operation management costs. It becomes possible.

In addition, according to the present embodiment, the concentration and size of the SS component contained in the separated liquid separated by the solid-liquid separation device (vertical filtration concentration device) is measured with the camera, and the vertical filtration is performed based on the measurement result. By properly controlling the supply amount of the flocculant in the concentrator, the following many excellent effects are exhibited.
By measuring the SS concentration of SS and the outline (size) of SS with a camera, it is possible to easily determine the water quality (property) of the NS, and instantly grasp the operating state of the vertical filtration concentrator. Therefore, appropriate and stable operation management can be performed.
Moreover, when controlling the flocculant injection rate of the solid-liquid separator based on the measurement result of the camera, it is possible to properly inject the flocculant, and the water to which the separated liquid returns by maintaining a high SS. It is possible to reduce the load on processing and the amount of the flocculant that has been injected so much in view of safety.
If a high SS recovery rate can be maintained, the separated liquid can be reused as washing water for other dehydrators, which can contribute to reducing the environmental burden of the entire sludge treatment facility.

  Moreover, a to-be-processed object is sludge, such as sludge and digested sludge which generate | occur | produce from the biological treatment process of a sewage treatment plant, for example. Therefore, the properties of such sludge are not always constant, and differ depending on the properties of sewage and the treatment status of the biological treatment process. It can be said that the properties of the supplied sludge always change when the solid-liquid separator is used to separate the solid-liquid. Even if the property of the object to be processed supplied to the solid-liquid separation device changes, the SS in the diluted agglomerated sludge or the diluted separated liquid is imaged with a camera to detect the color area and contour and control the supply amount of the aggregating agent. As a result, even if the properties of the object to be processed have changed, the amount of flocculant supplied is controlled according to the SS generated on the liquid surface of the separation liquid 405, thereby agglomerating in accordance with changes in the properties of the object to be processed. The supply amount of the agent can be determined.

  The area detection unit 901, the contour detection unit 902, and the storage unit 903 in the above-described embodiment are not limited to being provided in the camera 90, and may be provided in a computer. Further, the functions of the area detector 901, the contour detector 902, and the control panel 70 may be realized by a computer. In that case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory inside a computer system serving as a server or a client in that case may be included and a program held for a certain period of time. Further, the program may be a program for realizing a part of the above-described functions, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system. You may implement | achieve using programmable logic devices, such as FPGA (Field Programmable Gate Array).

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1, 1a Sludge concentration system 10 Flocculant supply pump 11 Flocculant flow meter 20 Sludge supply pump 21 Sludge concentration meter 22 Sludge flow meter 30 Mixing tank 31 Pressure gauge 40 Vertical filtration concentration device 40a Solid-liquid separation device 50 Concentrated sludge extraction pump 60 Communication Cable 70 Control Panel 71 Amplifier 72 Sequencer 80 Computer 90, 90a Camera 341, 341a Storage Container 342, 342a Overflow Weir 343 Diluted Aggregated Sludge 343a Diluted Separated Liquid 701 Storage Unit 702 Judgment Unit 703 Control Unit 901 Area Detection Unit 902 Outline Detection unit 903 Storage unit 7031 Dilution water supply control unit 7032 Sludge supply control unit 7033 Coagulated sludge discharge control unit

Claims (8)

A storage unit for introducing and storing the coagulated sludge after the coagulant and sludge are mixed;
A dilution water supply unit for supplying dilution water to the housing unit;
An imaging unit that images the liquid level of the storage unit;
Diluted sludge imaging system. A densitometer for measuring the concentration of the coagulated sludge;
A dilution water supply control unit for controlling the supply amount of the dilution water according to the measurement result of the concentration meter, or a supply amount of the coagulated sludge supplied to the storage unit according to the measurement result of the concentration meter At least one of the sludge supply control units;
The diluted sludge imaging system according to claim 1, comprising: The agglomerated sludge is from a path through which the agglomerated sludge is supplied from a mixing tank in which the aggregating agent and the sludge are mixed to a solid-liquid separator, or from a path from which the separated liquid after solid-liquid separation is discharged from the solid-liquid separator. The diluted sludge imaging system according to claim 1, wherein the diluted sludge imaging system is introduced and accommodated in the accommodating portion. The supply part which supplies the dilution liquid sludge which is the coagulation sludge accommodated in the said accommodating part and diluted with the said dilution water from the said accommodating part to a solid-liquid separator is in any one of Claims 1-3. The diluted sludge imaging system described. 5. The agglomerated sludge discharge part that discharges the diluted agglomerated sludge that is accommodated in the accommodating part and is diluted with the dilution water from the accommodating part and replaces the agglomerated sludge. The diluted sludge imaging system according to item 1. The diluted sludge imaging system according to any one of claims 1 to 5,
An area detection unit for detecting the area of suspended solids present in the separation liquid from the imaging data obtained from the imaging unit;
A contour detection unit for detecting a contour of suspended solids present in the separation liquid from imaging data obtained from the imaging unit;
A determination unit that compares the relationship between the area of the suspended solids and the outline of the suspended solids and a reference range;
Based on the result of comparison in the determination unit, a control unit for controlling the amount of flocculant added by the flocculant addition unit,
A flocculant addition control system.   A sludge concentration system including the flocculant addition amount control system according to claim 6. The storage unit stores the coagulated sludge branched from the supply path for supplying the coagulated sludge after the coagulant and sludge are mixed,
A dilution water supply unit supplies dilution water to the housing unit;
A diluted sludge imaging method in which an imaging unit images the liquid level of the storage unit.