KR200429242Y1 - On-line sludge volume index meter using image analysis - Google Patents

Abstract

The present invention relates to the measurement of activated sludge sedimentation capacity and sludge state diagnosis apparatus in a sewage treatment plant using an image analysis technique. The activated sludge is supplied to the mass cylinder type column 41 from the aeration tank R through the sludge supply unit 46. The sludge layer is taken at a predetermined time interval using the camera 42 for the entire process of inflow, stagnation and precipitation for a predetermined time, and the image is transmitted to the computer 45 connected to the camera for analysis. It is possible to check the sedimentation status in real time, and the Sludge Volume Index (SVI), which is the sludge sedimentation index, can be obtained through the sludge settling height measured in this device together with the concentration value of activated sludge entered into the database. In addition, the present invention relates to a sludge sedimentation capacity measurement and sludge state diagnosis apparatus for predicting the sedimentation capacity according to the variation of the SVI values thus obtained, and analyzing the image of the supernatant during sedimentation.

That is, the present invention measures the sludge blanket height and the supernatant turbidity by measuring the measuring mass cylinder in which activated sludge is introduced into the bioreactor of the sewage treatment plant, etc., and the sludge blanket height obtained by the image analysis and the MLSS (Mixed Liquor) of the database. The present invention relates to an apparatus for measuring SVI using Suspended Solid concentration, and estimating Suspended Solid (SS) concentration by analyzing supernatant turbidity obtained by the image analysis.

Sludge Sedimentation System, SVI, Image Analysis, Sludge Sedimentation Capacity, Sewage Treatment Plant

Description

        On-line sludge volume index meter using image analysis}

1 is a perspective view showing a sludge sedimentation characteristic measuring apparatus according to the prior art.

Figure 2 is a perspective view showing a device for quantitatively measuring the area, brightness, distribution, etc. of activated sludge using an optical microscope and a CCD camera according to the prior art.

3 is a perspective view showing an activated sludge interface measuring apparatus according to the prior art.

Figure 4 is a system configuration of the sludge sedimentation capacity measurement apparatus using the image analysis technique of the present invention.

5 is a schematic diagram of an image analysis software program for acquiring and analyzing photographed images according to the present invention;

           <Description of the symbols for the main parts of the drawings>

41: cylindrical cylinder cylinder type 42: camera for image recording

43: light source for securing the light 43A: high-degree LED bulb plate

44: outside natural light blocking wall 45: computer

46: sludge supply device 46A: sludge inflow pump

46B: inlet pipe 46C: inlet valve

47: sludge outflow device 47A: sludge outflow pump

47B: Outlet Pipe 47C: Outlet Valve

48: washing device 48A: washing water injection pump

48B: Washing water pipe 49: Overflow water outlet

R: Aeration tank D: Drain tank

The present invention relates to an automatic sludge sedimentation capacity measurement and sludge condition diagnosis device, and more specifically, activated sludge flows into the cylinder type column, and the sludge sedimentation index by photographing the process of sedimentation for a predetermined time using a camera The present invention relates to a sludge sedimentation capacity measurement and sludge state diagnosis apparatus capable of predicting sedimentation capacity according to a variation pattern of a SVI (Sludge Volume Index) value and also analyzing the image of the supernatant during sedimentation.

 Generally, in the biological wastewater treatment process that removes contaminants in the wastewater by the growth of microorganisms, the sludge settling process of the secondary sedimentation tank separating the generated microbial cells and the contaminant-free wastewater is one of the most important processes of sewage treatment. Therefore, since more than 95% of the sewage treatment plants are currently operated as biological treatment processes, an apparatus for measuring sedimentation characteristics and sludge conditions of activated sludge in the sludge settling process of the secondary sedimentation tank is essential.

The Sludge Volume Index (SVI) is a sedimentation index for activated sludge, which provides representative quantitative information in the management of sewage treatment plants, and is an important basis for the operator to determine the state of activated sludge. This is the most used argument. Sludge Volume Index (SVI) is a rough measure of sedimentation characteristics in the daily operation of sewage treatment processes. This can be defined as the volume occupied by 1 g of sludge after 30 minutes of settling in the cylinder, indicating how much the concentration process has progressed after a standard time of 30 minutes. Due to the simplicity and ease of use of the assay, SVI is used extensively and for the quantitative determination of sludge sedimentation properties.

SVI (mL / g) = SV ₃₀ / X

Where X = sludge concentration (g MLSS / L)

SV ₃₀ = volume of 1L of sludge after 30 minutes of settling (mL / L)

1 is a schematic configuration diagram showing a sludge sedimentation characteristic measuring apparatus disclosed in Korea Utility Model Registration No. 20-0395649. As shown in FIG. 1, samples are sequentially supplied from an aeration tank to a table 11 on a disc that is stationary and rotatable at regular intervals, and to a plurality of cylinders 12 arranged upright in an arc at an edge portion of the upper surface of the table. . It is a device for measuring SVI by scanning the amount of activated sludge by reciprocating up and down along one cylinder through a fixed optical sensor provided outside one side of the table. It stops after the table with multiple cylinders is rotated at a certain speed by a certain angle, and the sampling sludge treatment water is supplied to one cylinder while the table is stopped while the SV ₃₀ is measured on the other cylinder and then rotates again. And a technical feature in which a repetitive operation of stopping is performed. However, the sludge deposition process is not measured continuously, but the height of the sludge layer after sedimentation is measured by the optical sensor, and the calculated value is expressed as SV ₃₀ value.

Fig. 2 is a schematic diagram showing an apparatus for quantitatively measuring the area, luminance, distribution, and the like of active sludge using the optical microscope 4a and CCD camera 20 disclosed in Japanese Patent Laid-Open No. Hei 6-114391. The image processing apparatus 21 including the CCD camera 20 is used to measure microorganisms in the aeration tank, and to find a state of the aeration tank by searching the database for an operation method based on the measured data. This is a device that allows the user to take a sample of aeration tank and observe the type and condition of the sludge after observation under a microscope. It is impossible to measure the sludge continuously and cannot measure it online. It is not a device that directly measures the sludge interface.

3 is a schematic diagram which shows the activated sludge interface measuring device disclosed by Unexamined-Japanese-Patent No. 9-145693. Sludge interfacial transducer 33 for converting the ultrasonic signal detected by the sludge interfacial system 32 composed of an ultrasonic transmitter and an ultrasonic receiver which is immersed in the secondary sedimentation basin 31 in the sewage treatment plant to perform vertical scanning. It is a measuring device that compares (34) the electric signal output from the preset value with the preset value, and determines the depth of the interface in the secondary settling basin based on the result of the comparison. Due to the severe change in the value of the reliability is low, there is a problem that is affected by the electrical conductivity, density, transparency.

Sludge sedimentation measuring devices known in the prior art do not directly monitor the sedimentation process of the sludge. In addition, the measurement of the sludge interface measurement method by the ultrasonic signal has a problem that the value is severely changed due to the surrounding environmental factors, the reliability is lowered, and the electrical conductivity, density, and transparency are affected. In addition, the driver is reluctant to use it as a measuring device because it is impossible for the driver to verify or verify the data.

Thus, the present invention can visualize the sedimentation process in real time using an image analysis technique to measure the sedimentation capacity of activated sludge in order to solve the problems of the prior art as described above, it is possible to evaluate or verify the sludge layer It is designed to make it possible.

Quantitative and qualitative information on sludge color, supernatant turbidity, sludge floc size, and settling rate (other than odors, bubbles, etc.) measured and recorded by most operators in active sludge sedimentation processes are available online using image analysis techniques. In the automatic measurement and diagnostics, the sludge blanket height is measured from an image obtained by photographing a measuring cylinder with a camera, and the SVI is calculated using the MLSS (Mixed Liquor Suspended Solid) concentration of the database. It is to provide a device for automatically measuring sludge sedimentation capacity and diagnosing sludge condition by analyzing the image and calculating the concentration of suspended solids (SS).

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the automatic sludge sedimentation measuring apparatus using an image analysis technique according to the present invention.

First, Figure 4 is a schematic diagram showing an automatic sludge sedimentation measurement system using an image analysis technique according to the present invention. As shown, the sludge sedimentation capacity measuring apparatus according to the present invention is a mass cylinder (41), which is a sludge precipitation reactor composed of a cylinder for performing the precipitation experiment; A camera 42 capable of photographing the sedimentation state of the sludge; An LED light source unit 43 for securing an image for photographing; An exterior case 44 for minimizing the effects of light scattering and shadows that may affect the image analysis result; A computer 45 which is a computing device equipped with image analysis software for acquiring and analyzing the photographed image; A sludge supply device 46 for injecting a sample to be measured; A sludge discharge device 47 for discharging the finished sample; A cleaning device 48 for cleaning the inside of the cylinder 41 for next sample measurement; It consists of a monthly water outlet 49 for the discharge of excess sludge injected.

The mass cylinder 41, which is a sludge precipitation reactor composed of cylinders for performing the precipitation experiment, discharges sludge after completion of the measurement with an inlet portion 41A capable of introducing and discharging sludge in the lower portion as shown in FIG. A tap water inlet 41B for cleaning the cylinder inner wall for the next measurement, a dispersing device 41C for supplying tap water to the wall of the cylinder, and a drain pipe 41D for natural discharge of excess sludge during sludge injection. It is composed of

In addition, the interior space for taking images is to increase the accuracy of image shooting by installing a white wall (44) to block the external natural light, the high-brightness LED light source unit 43 to secure the lighting for shooting Install on the top of the cylinder.

Therefore, in order to measure the sedimentation state of the sludge, a certain amount of sludge is pumped into the measuring cylinder 41 using the sludge inflow pump 46A from the aeration tank R, and at this time, the influent automatic valve 46C is opened and the sludge outflow. The valve 47C is closed. The introduced sludge is discharged through the drain pipe 49 except for a certain amount for measuring, so that only a predetermined amount remains. After a certain amount of sludge is injected, the inflow pump 46A and the inlet valve 46C are closed, and from this time, the process of sludge settling at a predetermined time interval is photographed through the image photographing camera 42. The captured image is transmitted to a computer 45, which is a computing device equipped with image analysis software for acquiring and analyzing the captured image in real time. Using the technique of dividing the transmitted image into individual pixels, analyzing the red-green-blue (RGB) code values of the divided pixels, the height of the sludge interface is found, and using the MLSS concentration of the database already stored in the computer. Find the SVI value.

After the measurement is finished, the sludge discharge valve 47C is opened and discharged to the drain storage tank D by the sludge discharge pump 47A. While being discharged, the washing water pump 45A is operated so that the tap water flows into the cylinder and descends along the cylinder wall to clean the first measured residual sludge remaining on the wall so as not to affect the next measurement.

All of these processes can be performed automatically by a pre-programmed program, which is configured to allow the operator to enter the measurements directly. The program thus constructed is shown in FIG. As shown in FIG. 5, the sludge interface is found and visualized based on the transmitted image, and the MMI (Man Mechine Interface) program capable of finding out the SVI value is represented by modeling an image of a process of being deposited. Also, the captured images are stored separately for each measurement time so that they can be viewed according to the user's needs.

Although the above description has been made with reference to the embodiments of the present invention, the present invention is not limited to the above embodiments, and those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description in the specification but should be defined by the claims.

In the present invention configured as described above, it is possible to automatically measure the SV ₃₀ and SVI values of the sedimentation index of the aeration tank sludge. The measured values can be analyzed, stored, and transmitted online. The SVI measurement, which is an indicator of sedimentation, has the advantage of autonomous automation with this device. And by shooting the sludge interface directly with the camera, the error of the analysis value does not occur due to external environmental factors, and after the measurement is completed, the driver can see the stored image again after checking to check the reliability of the measured value. It is a device that can increase the reliability of the analyzed value.

Sludge blanket height of sedimentation tank can be estimated through image analysis through sludge sedimentation experiment, and stable activity as a device that can suggest the alternative by estimating sludge bulking and identifying the cause of sludge sedimentation decay through diagnosis of sedimentation capacity of activated sludge It can be used as a device that can maintain the operation of the sludge process. In addition, it is possible to estimate the concentration of suspended solids (Suspended Solid, SS) through image analysis of supernatant.

Claims (3)

        In the automatic sludge sedimentation measuring device, A cylindrical cylindrical sludge precipitation reactor 41 for performing precipitation experiments; A camera 42 for capturing the cylindrical cylindrical sludge precipitation reactor at regular time intervals to obtain an image; A light source unit 43 for supplying light for image capturing; An exterior case 44 for minimizing the effects of light scattering and shadows that may affect the image analysis result; A computer (45) having a database and a program for analyzing an image obtained from the camera; A sludge feeder 46 for injecting a sample to be measured; A sludge discharge device 47 for discharging the finished sample; And Sludge sedimentation capacity measurement apparatus using an image analysis technique, characterized in that it comprises a washing water supply unit for injecting tap water for washing the inside of the cylinder (41) for measuring the next sample. The method of claim 1, Cylindrical cylindrical sludge sedimentation reactor has an inlet and outlet 41A for inflow and discharge of sludge, and a tap water inlet 41B for discharging the sludge after the measurement is completed and washing the inner wall of the cylinder for the next measurement. Sludge sedimentation capacity measurement apparatus using an image analysis technique comprising a dispersing device (41C) for supplying tap water to the wall of the cylinder, and a drain pipe (41D) for the natural discharge of excess sludge during sludge injection. The method of claim 1, The photographed image may be transmitted to the remote computer 45 in real time using wired or wireless communication, and the user may further include a control means for controlling all functions online from the remote site. Sludge sedimentation capacity measuring device.

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