Sewage purification equipment abnormality detection system

Abstract

Provided is a sewage purification apparatus abnormality detection system that can detect the aeration and water level conditions in the sewage purification apparatus and more accurately and effectively detect abnormalities in the sewage purification apparatus. [Solution] An abnormality detection system for a sewage purification device that uses a blower 22 to send air into the inside of a septic tank 10 to aerate it and purify the sewage W2 inside the septic tank 10 using aerobic microorganisms, and is equipped with a float 1 that is installed on the surface of the sewage W2 inside the septic tank 10 and can sway in accordance with the swaying of the surface of the sewage W2, a vibration sensor 6 installed inside the float 1, a management device 30 that receives a detection signal sent from the vibration sensor 6, an abnormality determination means 34 that determines that there is an abnormality if the magnitude of the vibration of the float 1 calculated from the detection signal of the vibration sensor 6 is below a reference value, and an abnormality notification means 35 that issues an abnormality signal based on the determination by the abnormality determination means 34.

Description

[Technical Field]

[0001] The present invention relates to an abnormality detection system that detects abnormalities in sewage purification equipment such as a septic tank. [Background technology]

[0002] A septic tank is a device that purifies wastewater, including domestic wastewater and human waste, generated from homes. The organic matter contained in the wastewater is decomposed by aerobic microorganisms inside the tank, and the purified treated water is discharged into drains or rivers via drainage pipes. In addition, when the organic matter contained in the wastewater is decomposed by the aerobic microorganisms inside the tank, air is sent into the tank using a blower (air pump), which stimulates the activity of the aerobic microorganisms inside the tank and promotes contact with the organic matter through agitation.

[0003] However, if there is an abnormality in the blower or aeration pipe (for example, the blower stops or an air leak from the aeration pipe), the appropriate amount of air cannot be sent into the septic tank (poor aeration), which causes the activity of aerobic microorganisms in the septic tank to stagnate and causes poor mixing, preventing the sewage that flows into the septic tank from being properly purified, resulting in the generation of foul odors and a deterioration in water quality.

[0004] In light of the above background, devices have been proposed to detect abnormalities in septic tanks, including a device that uses a barometric sensor to detect electrical abnormalities in the blower, abnormal air supply, air leaks in the air supply piping, and clogged air diffusers (Patent Document 1), and a device that uses a sensor to detect the blower's discharge pressure, continuously compares the detected pressure with upper and lower reference pressures, and issues an alarm when it determines an abnormality (Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-169310 [Patent Document 2] Patent No. 3976072 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the abnormality detection devices of Patent Documents 1 and 2 do not detect the aeration state inside the septic tank, and if the aeration state inside the septic tank could be detected, it would be possible to more accurately detect abnormalities in the septic tank.

[0007] The present invention has been made in consideration of the above-mentioned problems, and aims to provide an abnormality detection system for a sewage purification device that can detect the aeration and water level state within the sewage purification device and more accurately and effectively detect abnormalities in the sewage purification device. [Means for solving the problem]

[0008] In order to solve the above problems, The abnormality detection system for a sewage purification apparatus according to the present invention comprises: In an abnormality detection system for a sewage purification device, air is sent into the inside of a septic tank by a blower to aerate the tank, and the sewage inside the septic tank is purified by aerobic microorganisms inside the septic tank. Hanging by a string A float that is installed on the surface of the wastewater inside the septic tank and can sway in accordance with the swaying of the surface of the wastewater; A motion sensor installed inside the floating body; The detection signal transmitted from the vibration sensor is received, and the magnitude of the vibration of the floating body calculated from the detection signal is below the reference value. , and the magnitude of the tilt of the floating body calculated from the detection signal is less than a reference value. an abnormality determination means for determining that an abnormality exists when A first feature is that the device is provided with an abnormality notification means for issuing an abnormality signal based on the determination by the abnormality determination means.

[0011] The abnormality detection system for a sewage purification apparatus according to the present invention comprises: The magnitude of the floating body's sway calculated from the detection signal sent from the sway sensor is below the reference value. And when the magnitude of the tilt of the floating body calculated from the detection signal is less than the reference value The abnormality determination means determines whether an aeration abnormality or The first step is to determine whether the water level is abnormal. 2 The characteristics of this system are as follows:

[0012] The abnormality detection system for a sewage purification apparatus according to the present invention comprises: In an abnormality detection system for a sewage purification device, air is sent into the inside of a septic tank by a blower to aerate the tank, and the sewage inside the septic tank is purified by aerobic microorganisms inside the septic tank. a float that is suspended by a string and placed on the surface of the wastewater inside the septic tank and can sway in accordance with the swaying of the surface of the wastewater; A motion sensor installed inside the floating body; an abnormality determination means for receiving a detection signal transmitted from the oscillation sensor, and determining that an abnormality has occurred when the magnitude of the oscillation of the float calculated from the detection signal exceeds a reference value and the magnitude of the inclination of the float calculated from the detection signal is equal to or greater than a reference value; The device is provided with an abnormality notification means for notifying an abnormality signal based on the determination by the abnormality determination means. That is the first 3 The characteristics of this system are as follows: [Effects of the Invention]

[0014] As described above, according to the present invention, the aeration and water level conditions within the sewage purification device can be detected using a swing sensor built into the float, thereby achieving the effect of accurately and effectively detecting abnormalities in the sewage purification device. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a diagram showing the configuration of an abnormality detection system for a wastewater purification apparatus according to the present invention. [Figure 2] (A) is a front view of the float, and (B) is a diagram of the sensor module. [Figure 3] FIG. 2 is a configuration diagram of a management device. [Figure 4] (A) is a diagram showing the vibration sensor installed inside the floating body and the three axis directions, and (B) is a diagram showing the vibration sensor and the angle of the two axes (XZ axes) and the X axis after tilting. [Figure 5] (A) shows normal aeration conditions, and (B) shows abnormal aeration conditions. [Figure 6] (A) shows an abnormal water level (rising), and (B) shows an abnormal water level (falling). [Figure 7] FIG. 1 shows the results of an aeration test. [Figure 8] FIG. 1 shows the results of an aeration test. [Figure 9] FIG. 10 shows the results of a water level test. BEST MODE FOR CARRYING OUT THE INVENTION

[0016] The best mode for carrying out the present invention will be described with reference to the drawings. Figure 1 shows the configuration of an anomaly detection system for a sewage purification device according to the present invention, in which symbol S denotes the anomaly detection system and symbol 10 denotes a septic tank (sewage purification device).

[0017] First, the septic tank 10 will be described. The septic tank 10 is a device for purifying domestic wastewater and wastewater containing human waste generated in homes, and as shown in Figure 1, it includes a septic tank main body 11. The interior of the septic tank main body 11 is partitioned, from upstream to downstream, into a first anaerobic filter bed tank 12, a second anaerobic filter bed tank 13, a contact aeration tank 14, a settling tank 15, and a disinfection tank 16. An inlet 17 is provided in the first anaerobic filter bed tank 12, and an outlet 18 is provided in the disinfection tank 16.

[0018] The first anaerobic filter bed tank 12 uses anaerobic microorganisms attached to the contact material (anaerobic filter bed) 19 to perform primary removal (organic matter decomposition) of suspended matter (solid matter) contained in the wastewater W0 flowing in from the inlet 17. The second anaerobic filter bed tank 13 uses anaerobic microorganisms attached to the contact material (anaerobic filter bed) 20 to perform secondary removal (organic matter decomposition) of suspended matter (solid matter) contained in the wastewater W1 flowing in from the first anaerobic filter bed tank 12.

[0019] In the contact aeration tank 14, aerobic microorganisms attached to the contact material (aerobic filter bed) 21 decompose organic matter, including suspended matter, contained in the wastewater W2 flowing in from the second anaerobic filter bed tank 13. Inside the contact aeration tank 14, an aeration pipe 23 continuing from an external blower (air blower) 22 extends to near the bottom.

[0020] The air diffuser 23 is a type of air piping, and when the blower 22 is operated, it supplies air (oxygen) to the vicinity of the bottom inside the contact aeration tank 14, thereby activating the activity of aerobic microorganisms attached to the contact material 21. In addition, the sewage W2 inside the contact aeration tank 14 is circulated to promote contact with the aerobic microorganisms.

[0021] Sedimentation tank 15 is a tank in which solids are precipitated from treated water W3 after organic decomposition inside contact aeration tank 14, and the supernatant water after settling of the solids is sent from the outlet of sedimentation tank 15 through filter 24 to disinfection tank 16. A return pipe 25 is arranged between the inside of contact aeration tank 14 near sedimentation tank 15 and first anaerobic filter bed tank 12, for returning the solids that have settled inside sedimentation tank 15 to first anaerobic filter bed tank 12.

[0022] The disinfection tank 16 is a tank that disinfects the supernatant water sent from the settling tank 15 through the filter 24 with a specified chemical, and the supernatant water disinfected inside the disinfection tank 16 is discharged as purified water W4 from the outlet 18 through a discharge pipe into a street gutter or river.

[0023] Next, the abnormality detection system S will be explained. The abnormality detection system S is a system that detects abnormalities (aeration abnormalities, water level abnormalities) during use of the septic tank 10, and the abnormality detection system S comprises a capsule-shaped float 1, a sensor module 2 installed inside the float 1, and a management device (server) 30. The management device 30 is connected to an administrator terminal 40, and is connectable to a person in charge terminal 41 via a network 50.

[0024] The float 1 is made of a lightweight material such as plastic resin that can float on the surface of the wastewater W2, and as shown in Figure 2(A), it is composed of a main body 1A and a lid 1B that is removably attached to the opening on the top surface of the main body 1A. Inside the main body 1B, there is provided a storage chamber 3 for fixing and storing the sensor module 2, and on the top of the lid 1A, there is provided a locking part 5 for locking a string 4 for suspending the float 1 above the water surface Ws of the wastewater W2.

[0025] The float 1 used is, for example, about 45 mm in diameter and 100 mm in height, and is suspended by strings 4 from an aeration pipe 23 or the like inside the contact aeration tank 14, as shown in Figure 1, and is placed above the water surface Ws of the wastewater W2 when the water level is normal. Furthermore, when the float 1 is the above size, it is placed so that the lower part of the main body 1A is immersed about 2 cm below the water surface Ws of the wastewater W2 when the water level is normal, which allows the swaying of the float 1 to stably follow the swaying of the water surface Ws of the wastewater W2 when the water level is normal.

[0026] The string 4 is made of a non-stretchable and flexible material, and is fastened to the horizontal pipe parts of the air diffuser pipe 23 and the return pipe 25 to suspend the floating body 1.

[0027] As shown in FIG. 2(B), the sensor module 2 includes a swing sensor 6, a signal transmitting unit 7, a control unit (microcomputer) 8, and a power supply unit (battery) 9.

[0028] An acceleration sensor or a vibration sensor is used as the swing sensor 6. In this embodiment, an acceleration sensor is used. The acceleration sensor periodically acquires acceleration data (FIGS. 7 to 9) in the three axial directions (X, Y, and Z axes) (FIG. 4(A)) of the floating body 1 at regular intervals in accordance with the swing of the floating body 1. In this embodiment, the acceleration data in the three axial directions of the floating body 1 is acquired as point data, for example, 60 times every 0.5 seconds, two to three times a day.

[0029] Based on a control signal from the control unit 8, the signal transmitting unit 7 periodically (for example, 2 to 3 times a day) transmits the acceleration data (detection signals) of the floating body 1 in the three-axis direction acquired by the oscillation sensor 6 (data from 60 points) to the management device 30.

[0030] The control unit 8 controls the swing sensor 6, the signal transmission unit 7, and the power supply unit 9, and the power supply unit 9 supplies electricity to the swing sensor 6, the signal transmission unit 7, and the control unit 8, respectively.

[0031] As shown in Figure 3, the management device 30 includes a communication unit 31, a database 32, a calculation unit 33, an abnormality determination unit 34, and an abnormality notification unit 35, and is connected to an administrator terminal 40 and can be connected to a person in charge terminal 41 via a network 50.

[0032] The communication unit 31 transmits and receives data, and receives signals (detection signals) transmitted from the signal transmission unit 7 of the floating body 1 via the network 50 periodically (for example, two to three times a day).

[0033] The database 32 periodically stores the acceleration data in the three axes directions (data for 60 points) acquired by the motion sensor 6, and also stores various information on the magnitude of the motion and the tilt of the floating body 1 quantified by the calculation unit 33, the results determined by the abnormality determination unit 34, and various execution programs including quantification and abnormality determination.

[0034] The calculation unit 33 performs calculation processing on the acceleration data in the three axial directions (data for 60 points) acquired by the motion sensor 6, and first digitizes the magnitude of the motion of the floating body 1. The digitization processing is performed by a calculation program in the following steps (1) to (3).

[0035] Step (1): Calculate the jerk. For each point of data in the three axial directions (X, Y, and Z axes) (Fig. 4(A)) acquired by the vibration sensor 6, the rate of change in acceleration (jerk) is calculated compared to the data of the previous point. The rate of change of acceleration over time is used to calculate the jerk. Specifically, the following formula is used to calculate the difference in acceleration between the data of each point (i) and the data of the previous point (i-1). TIFF0007774358000002.tif32134Next, the Euclidean norm is used to calculate the combined jerk value of the three axes. TIFF0007774358000003.tif14134This is repeated 59 times (since there are 60 data points, there are 59 combinations of adjacent data points).

[0036] Step (2): Calculate the sum of all jerks (totalJerk). Add up all the jerks (total = 59) (jerkSum). TIFF0007774358000004.tif13134

[0037] Step (3): Calculate the average jerk (avgJerk). The average jerk (avgJerk) is calculated by dividing the sum of all jerks (totalJerk) by the number of data point combinations (60 - 1 = 59). TIFF0007774358000005.tif13134

[0038] By following steps (1) to (3) above, we can find the average value of the rate of change of acceleration (jerk) every 0.5 seconds in the three axial directions (X, Y, and Z axes) of float 1. If the average value of the rate of change of acceleration is large, we can determine that the acceleration change of float 1 is severe (float 1 is experiencing a lot of swaying, vibration, and impact), and if the average value of the rate of change of acceleration is small, we can determine that the acceleration change of float 1 is small (float 1 is experiencing little swaying, float 1 is stable).

[0039] Next, the calculation unit 33 performs calculation processing on the acceleration data (60 points of data) in the three-axis directions acquired by the motion sensor 6, and digitizes the magnitude of the tilt of the floating body 1. The digitization processing is performed by a calculation program in the following steps (1) to (2).

[0040] Step (1): Calculate the angle of the X axis (θx). Specifically, from the acceleration data (60 points of data) in the three axis directions (X, Y and Z axes) (Fig. 4(A)) acquired by the vibration sensor 6 60 times every 0.5 seconds, the tilt (θx) of the X axis, i.e., the angle (θx) of the X axis relative to the direction of gravity G (Fig. 4(B)), is calculated for each point.

[0041] Referring to Figures 4(A) and 4(B), the tilt of the X-axis (θx) is defined as 0° when the X-axis points in the direction of gravity G (vertical downward relative to the ground). The instantaneous angle of the X-axis (θx) is calculated using the ratio of the acceleration data for the two axes (X and Z axes) at each point using the following formula that uses the atan2 function. TIFF0007774358000006.tif13134 Note that depending on the change in the posture of the oscillation sensor 6 installed inside the floating body 1 (e.g., from vertical to horizontal posture), the calculation results are adjusted within the range of 0° to 180° (tilt of the X-axis after adjustment: θx'). TIFF0007774358000007.tif13134Repeat this for each of the 60 data points.

[0042] Step (2): Calculate the average angle. To reduce momentary variations in the data for each of the 60 points, the average value of the X-axis angle is calculated. TIFF0007774358000008.tif13134

[0043] The average value of the X-axis angle (θx) every 0.5 seconds is calculated using the above steps (1) and (2). If the average value of the X-axis angle (θx), with the direction of gravity G being 0°, is approximately 0° or close to that angle (approximately 1 to 10°), it can be determined that the motion sensor 6 is in a normal orientation (Figs. 5(A)(B), Fig. 6(B)). If the average value is close to 90°, it can be determined that the motion sensor 6 is in a sideways orientation (Fig. 6(A)). If the average value is close to 180°, it can be determined that the motion sensor 6 is in an upside-down orientation.

[0044] In the above case, if the oscillation sensor 6 is in a normal orientation, it can be determined that the water level is normal (Figures 5(A)(B)) or that the water level is abnormal due to a drop in water level (Figure 6(B)). If the oscillation sensor 6 is in a sideways or upside-down orientation, it can be determined that the water level is abnormal due to a rise in water level (Figure 6(A)).

[0045] The abnormality determination unit 34 determines whether or not there is an abnormality (aeration abnormality, water level abnormality) from a combination of the magnitude of the swaying of the float 1 and the magnitude of the tilt of the float 1. The abnormality determination unit 34 first determines whether or not there is an abnormality (aeration abnormality, water level abnormality) from a combination of the magnitude of the swaying of the float 1 and the magnitude of the tilt of the float 1. 3 ) and the numerical value of the magnitude of the tilt of the float 1 is less than the reference value (average value of the X-axis angle θx = 20°), it is determined that there is no abnormality (aeration is normal and the water level is normal) (Figure 5(A)).

[0046] Secondly, the abnormality determination unit 34 determines whether the numerical value of the magnitude of the swing of the floating body 1 is equal to or greater than the reference value (average value of jerk=0.3 m / s 3 ) and the numerical value of the magnitude of the tilt of the float 1 is equal to or greater than the reference value (average value of the X-axis angle θx = 20°), it is determined that there is an abnormality (abnormal water level (rising)) (Figure 6(A)).

[0047] Thirdly, the abnormality determination unit 34 determines whether the numerical value of the magnitude of the swing of the floating body 1 is equal to or greater than the reference value (average value of jerk=0.3 m / s 3 ) or less and the numerical value of the magnitude of the tilt of the float 1 is less than the reference value (average value of the X-axis angle θx = 20°), it is determined that there is an abnormality (aeration abnormality or water level abnormality (drop)) (Figure 5(B), Figure 6(B)).

[0048] The reference value of the magnitude of the swing of the floating body 1 (average jerk = 0.3 m / s 3 ) was set based on the actual measured values ​​from the aeration test. As shown in Figures 7 and 8, under normal conditions (Figure 5(A)), the average jerk value was 0.3 m / s 3 However, when aeration was stopped (Fig. 5(B)), the value was 0.1 to 0.2 m / s. 3 Although there may be shaking when there is an inflow or backflow of sewage (backflow from the discharge pipe due to rainwater, etc.), the value is 0.3 m / s. 3 It never exceeded that.

[0049] The reference value for the inclination of float 1 (average value of X-axis angle θx = 20°) was set based on the actual measured value of the water level test conducted at the same time as the aeration test. As shown in Figures 7 and 8, at normal water levels (Figure 5(A)), the inclination is less than 20°, but as the water level rises, the inclination of float 1 increases (25-35°) and finally turns sideways (Figure 6(A)). At normal water levels, even if swaying occurs due to inflow, etc., as mentioned above, the value never exceeds 20°.

[0050] Figure 9 shows the results of a single water level test. The average value of the X-axis angle θx at normal water levels was approximately 1 to 2°. However, when the water level was raised by 5 cm from the normal level (abnormal water level), the average value of the X-axis angle θx was approximately 22 to 23°. Furthermore, when the water level was raised by 10 cm from the normal level (abnormal water level), the average value of the X-axis angle θx was approximately 65 to 70°.

[0051] When the abnormality determination unit 34 determines that an abnormality has occurred, the abnormality notification unit 35 transmits an abnormality signal to the manager terminal 40 and the person in charge terminal 41 via the communication unit 31, thereby notifying the abnormality. Note that the abnormality notification unit 35 may be configured to transmit an abnormality signal when an abnormality has been determined to have occurred two times in a row.

[0052] Next, a method for detecting an abnormality in the septic tank 10 using the abnormality detection system S having the above configuration will be described below.

[0053] First, under normal conditions (Fig. 5(A)), the blower 22 operates normally, sending an appropriate amount of air from the air diffuser 23 into the contact aeration tank 12 of the septic tank 10, and aeration is performed normally. In addition, the water level of the wastewater W2 is at the normal water level (reference water level), and the water surface Ws of the wastewater W2 is swaying to a certain extent due to aeration.

[0054] The float 1, which is suspended from the aeration pipe 23 by a string 4 in the contact aeration tank 12, sways in accordance with the fluctuations of the water surface of the wastewater W2, in accordance with the height of the water surface (normal water level) of the wastewater W2. Data (60 times every 0.5 seconds) of points (Xi, Yi, Zi) in three axial directions (XYZ axes) acquired by the sway sensor 6 from the float 1 is transmitted to the management device 30 periodically (2 to 3 times a day).

[0055] In the management device 30, the calculation unit 33 quantifies the swaying and tilting of the float 1 based on the data of points in the three axial directions transmitted from the float 1, and the abnormality determination unit 34 determines whether or not there is an abnormality based on the magnitude of the quantified swaying and tilting of the float 1.

[0056] When the aeration and water level are normal (Fig. 5(A)), the magnitude of the sway of the floating body 1 is within the reference value (average jerk = 0.3 m / s 3 ) and the magnitude of the tilt of the floating body 1 is less than the reference value (average value of the X-axis angle θx = 20°) (Figures 7 and 8), so it is determined that there is no abnormality (normal).

[0057] When an aeration abnormality occurs, the blower 22 stops or air leaks from the aeration pipe 23, aeration stops or is in a poor state, and the water surface of the wastewater W2 in the contact aeration tank 12 is still or fluctuates very little.

[0058] When the aeration is abnormal and the water level is normal (Fig. 5(B)), the magnitude of the sway of the float 1 is within the reference value (average jerk = 0.3 m / s 3 ) or less, and the magnitude of the tilt of the float 1 is less than the reference value (average value of the X-axis angle θx = 20°) (Figures 7 and 8), the abnormality determination unit 34 determines that there is an abnormality (aeration abnormality), and the abnormality notification unit 35 sends an abnormality signal to the manager terminal 40 and the person in charge terminal 41.

[0059] When the water level is abnormal (rising), the water level rises from the normal water level due to factors such as clogging of the discharge pipe, backflow from the discharge pipe (rainwater, etc.), failure of the discharge pump, clogging of the return pipe 25, etc., and the inclination of the float 1 becomes greater.

[0060] When the aeration is normal and the water level is abnormal (rising) (Fig. 6(A)), the magnitude of the sway of floater 1 is equal to the reference value (average jerk = 0.3 m / s 3 ) and the magnitude of the tilt of the float 1 exceeds the reference value (average value of the X-axis angle θx = 20°) (Figure 8), the abnormality determination unit 34 determines that there is an abnormality (abnormal water level), and the abnormality notification unit 35 sends an abnormality signal to the manager terminal 40 and the person in charge terminal 41.

[0061] When the water level becomes abnormal (drops), the water level drops from the normal level due to factors such as leakage caused by damage to the contact aeration tank 12, damage to the disinfection tank 16, or a short circuit caused by gaps in the discharge pipe joints, and the float 1 becomes uninclined.

[0062] When the aeration is normal and the water level is abnormal (lowered) (Fig. 6(B)), the magnitude of the swing of floater 1 is equal to the reference value (average jerk = 0.3 m / s 3 ) or less, and the numerical value of the magnitude of the tilt of the float 1 becomes less than the reference value (average value of the X-axis angle θx = 20°), the abnormality determination unit 34 determines that there is an abnormality (abnormal water level), and the abnormality notification unit 35 sends an abnormality signal to the manager terminal 40 and the person in charge terminal 41.

[0063] According to the abnormality detection system S of this embodiment, the manager and person in charge can immediately grasp abnormalities (aeration abnormalities, water level abnormalities) in the septic tank 10 by receiving abnormality signals from the management device 30, and can take prompt measures to address the abnormalities in the septic tank 10.

[0064] In the abnormality detection system S of this embodiment, the calculation unit 33 quantifies the magnitude of the swaying of the float 1 and the magnitude of the tilt of the float 1 from the acceleration data in the three axes directions acquired by the vibration sensor 6, and the abnormality determination unit 34 determines whether or not there is an abnormality (aeration abnormality, water level abnormality) from the magnitude of the swaying of the float 1 and the magnitude of the tilt of the float 1, but it may also be configured to simply determine only abnormalities in either the aeration or water level.

[0065] In this case, the calculation unit 33 may digitize only the magnitude of the sway of the float 1 from the acceleration data in the three axes directions acquired by the sway sensor 6, and may digitize only the magnitude of the tilt of the float 1, and the abnormality determination unit 34 may determine the presence or absence of an aeration abnormality from the magnitude of the sway of the float 1, and may determine the presence or absence of a water level abnormality from the magnitude of the tilt of the float 1. Furthermore, the calculation unit 33 may select either an aeration abnormality or a water level abnormality based on the magnitude of the sway of the float 1 and the magnitude of the tilt of the float 1 digitized by the calculation unit 33, and detect the abnormality.

[0066] The abnormality detection system S of this embodiment accurately grasps the aeration state and water level state inside the contact aeration tank 12 based on the magnitude of sway and tilt of the float 1, which is suspended by a string 4 inside the contact aeration tank 12 and is stably positioned so that it can sway above the surface of the wastewater W2, and can accurately and quickly determine whether there are any aeration abnormalities or water level abnormalities in the septic tank 10 using a simple device.

[0067] In the anomaly detection system S of this embodiment, raw data of points in three axial directions (X, Y, and Z axes) acquired by the motion sensor 6 of the floating body 1 is transmitted to the management device 30, and in the management device 30, a database 32, a calculation unit 33, an anomaly determination unit 34, and an anomaly notification unit 35 perform data storage, calculation processing, anomaly determination, and anomaly notification. However, each of these mechanisms may be installed in the control unit 8 of the sensor module 2, and an anomaly signal may be transmitted from the sensor module 2 via the management device 30 or directly to the manager terminal 40 or the person in charge terminal 41. In addition, some of the functions of the management device 30 may be transferred to the sensor module 2.

[0068] The number of times (60 times every 0.5 seconds, 2 to 3 times a day) that the motion sensor 6 of the floating body 1 acquires point data (acceleration data) in the three axis directions (X, Y, and Z axes) is not limited and can be changed as appropriate. In addition, the number of times (2 to 3 times a day) that the data is transmitted to the management device 30 can also be changed as appropriate.

[0069] As explained in detail above, the present invention can more accurately and effectively detect abnormalities in purification equipment (such as poor aeration, aeration stoppage, rising or falling water levels), but the objects that can be detected by the present invention are not limited to purification equipment. For example, the present invention can also be applied to systems that detect abnormalities such as the stoppage of oxygen supply to tanks by blowers or abnormal water levels in tanks in fish farms or eel farms. [Industrial Applicability]

[0070] The present invention can be used as an abnormality detection system that detects abnormalities in a wastewater purification device. [Explanation of symbols]

[0071] 1 Floating body 1A Main body 1B Lid 2 Sensor Module 3. Storage Room 4. String 5 Locking part 6. Vibration sensor 7 Control Unit 8 Signal transmitter 9 Power supply section 10 Septic tank (sewage purification system) 11 Septic tank body 12 First anaerobic filter bed tank 13 Second anaerobic filter bed tank 14 Contact aeration tank 15 Settling tank 16 Disinfection tank 17 Inlet 18 Outlet 19,20,21 Contact material 22 Blois 23 Air diffuser 24 filters 25 Return pipe 30 Management device 40 Administrator terminal 41 Personnel terminal W0, W1, W2, W3 Sewage W4 Purified Water Ws water surface

Claims

1. In an abnormality detection system for a sewage purification device, air is sent into the inside of a septic tank by a blower to aerate the tank, and the sewage inside the septic tank is purified by aerobic microorganisms inside the septic tank. a float that is suspended by a string and placed on the surface of the wastewater inside the septic tank and can sway in accordance with the swaying of the surface of the wastewater; A motion sensor installed inside the floating body; an abnormality determination means for receiving a detection signal transmitted from the oscillation sensor and determining that an abnormality has occurred when the magnitude of the oscillation of the float calculated from the detection signal is equal to or less than a reference value and the magnitude of the inclination of the float calculated from the detection signal is less than a reference value; The device is characterized in that it comprises an abnormality notification means for notifying an abnormality signal based on the determination by the abnormality determination means. Anomaly detection system for sewage purification equipment.

2. The abnormality determination means is characterized in that it determines that there is an aeration abnormality or a water level abnormality when the magnitude of the float's sway calculated from the detection signal transmitted from the sway sensor is equal to or less than a reference value and the magnitude of the float's tilt calculated from the detection signal is less than a reference value. The abnormality detection system for a wastewater purification apparatus according to claim 1.

3. An abnormality detection system for a sewage purification device that uses a blower to send air into the inside of a septic tank to aerate it and purify the sewage inside the septic tank using aerobic microorganisms inside the tank, a float that is suspended by a string and placed on the surface of the wastewater inside the septic tank and can sway in accordance with the swaying of the surface of the wastewater; A motion sensor installed inside the floating body; an abnormality determination means for receiving a detection signal transmitted from the oscillation sensor, and determining that an abnormality has occurred when the magnitude of the oscillation of the float calculated from the detection signal exceeds a reference value and the magnitude of the inclination of the float calculated from the detection signal is equal to or greater than a reference value; The device is characterized in that it comprises an abnormality notification means for notifying an abnormality signal based on the determination by the abnormality determination means. Anomaly detection system for sewage purification equipment.

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