JP2012047593A - Concentration meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concentration meter capable of shortening time to be required for measurement of concentration distribution.SOLUTION: A storage unit 30 stores a plurality of pieces of interface data showing different positions of an interface of sludge in a treatment tank 2 and a plurality of pieces of concentration data showing the concentration distribution of the sludge in the treatment tank 2 corresponding to each of the plurality of pieces of interface data. An interface meter 32 measures a position of the interface based on time until reflection waves on the interface are received after transmitting ultrasonic waves to a liquid for measurement containing the sludge at a state that the liquid for measurement is in the treatment tank 2. A specification unit 33a specifies applicable interface data with the highest coincidence degree with a measurement result of the interface meter 32 among the pieces of interface data in the storage unit 30. An output unit 33b specifies and outputs relevant concentration data associated with the applicable interface data among the pieces of concentration data in the storage unit 30.

Description

  The present invention relates to a densitometer, and more particularly to a densitometer using ultrasonic waves.

  There is known a water treatment system for purifying sewage such as domestic wastewater or factory wastewater using activated sludge containing microorganisms such as bacteria.

  In the water treatment system, sewage mixed with activated sludge is supplied to a settling tank, and then the sewage is stirred in the settling tank. Microorganisms in the activated sludge purify the sewage by decomposing organic substances contained in the sewage. When stirring is stopped, the activated sludge precipitates over time.

  As precipitation of activated sludge proceeds, a layer of supernatant water is formed at the top of the settling tank, and a precipitate layer of activated sludge is formed at the bottom of the settling tank. In addition, sedimentation of activated sludge proceeds even within the activated sludge sedimentation layer. For this reason, the interface between the supernatant water layer and the activated sludge sedimentation layer sinks over time, and the concentration distribution of the activated sludge in the sedimentation tank also changes over time.

  The sedimentation layer of activated sludge is discharged from the settling tank through a discharge pipe attached to the bottom of the settling tank. Hereinafter, the interface between the supernatant water layer and the activated sludge precipitation layer is simply referred to as “interface”, and the activated sludge precipitation layer is simply referred to as “precipitation layer”.

  In the water treatment system, depending on the progress of water treatment, the activated sludge is added to the settling tank or the settling layer is discharged from the settling tank. Therefore, the water treatment system needs to grasp the progress of sewage treatment.

  Patent Document 1 describes a water treatment system that measures the position of an interface and the concentration of activated sludge and grasps the progress of sewage treatment based on the measurement results.

  Furthermore, in Patent Document 1, as a method for measuring the concentration distribution of activated sludge in the settling tank, the sludge concentration sensor is moved up and down in the settling tank to measure the distribution of sludge concentration in the vertical direction in the settling tank. The technology to do is described.

JP 2009-22865 A

  In the technique for measuring the concentration distribution of activated sludge in the settling tank described in Patent Document 1, the sludge concentration sensor is moved up and down in the settling tank to measure the vertical sludge concentration distribution in the settling tank. The

  For this reason, for example, when measuring the concentration of activated sludge every time Acm advances in the depth direction, it is necessary to measure the concentration of activated sludge every time the sensor of the sludge densitometer is sunk Acm. A is an arbitrary positive number.

  Therefore, the method for measuring the concentration distribution of the activated sludge described in Patent Document 1 has a problem that it takes a lot of time to measure the concentration distribution.

  An object of the present invention is to provide a densitometer capable of solving the above-described problems.

  The concentration meter of the present invention is a concentration meter for measuring the concentration distribution of the sludge in a treatment tank for precipitating sludge contained in a liquid, and a plurality of interfaces indicating different positions of the sludge interface in the treatment tank. Storage means for storing data and a plurality of concentration data indicating the concentration distribution of sludge in the treatment tank corresponding to each of the plurality of interface data, and a liquid to be measured containing sludge enters the treatment tank The ultrasonic wave is transmitted to the liquid to be measured, the reflected wave of the ultrasonic wave generated at the sludge interface in the treatment tank is received, and the reflected wave is received after the ultrasonic wave is transmitted. Measuring means for measuring the position of the sludge interface in the treatment tank based on the time until, the position of the interface shown in the measurement result of the measuring means, and each of the plurality of interface data in the storage means The degree of coincidence with the interface position shown in Calculating and specifying the interface data having the highest degree of coincidence with the measurement result of the measuring means among the interface data, and the specifying means out of the concentration data in the storage means And output means for specifying related density data corresponding to the interface data and outputting the related density data.

  The concentration meter of the present invention is a concentration meter for measuring the concentration distribution of the sludge in a treatment tank for precipitating sludge contained in a liquid, and a plurality of interfaces indicating different positions of the sludge interface in the treatment tank. Storage means for storing data and a plurality of concentration data indicating the concentration distribution of sludge in the treatment tank corresponding to each of the plurality of interface data, and a liquid to be measured containing sludge enters the treatment tank The ultrasonic wave is transmitted to the liquid to be measured, the reflected wave of the ultrasonic wave generated at the sludge interface in the treatment tank is received, and the reflected wave is received after the ultrasonic wave is transmitted. Measuring means for measuring the position of the sludge interface in the treatment tank based on the time until, the position of the interface shown in the measurement result of the measuring means, and each of the plurality of interface data in the storage means The degree of coincidence with the interface position shown in For each specific interface data specified by the specifying means, the specifying means for specifying a plurality of specific interface data in descending order of coincidence with the measurement result of the measuring means from the interface data in the storage means The related density data corresponding to the specific interface data is specified from the density data in the storage means, the average value of the density distribution indicated by the related density data specified for each specific interface data is calculated, and the density Output means for outputting an average value of the distribution.

  According to the present invention, the storage means includes a plurality of interface data indicating different positions of the sludge interface in the treatment tank, and a plurality of concentrations indicating the concentration distribution of the sludge in the treatment tank corresponding to each of the plurality of interface data. Store data. The measuring means measures the position of the sludge interface in the processing tank based on the time from when the ultrasonic wave is transmitted to the liquid to be measured in the processing tank until the reflected wave generated at the interface is received. The specifying unit specifies the corresponding interface data having the highest degree of coincidence with the measurement result of the measuring unit among the interface data. The output means specifies related density data corresponding to the interface data among the density data, and outputs the related density data.

  For this reason, when the position of the sludge interface in the liquid to be measured is measured using the reflected wave of the ultrasonic wave at the interface, the concentration data indicating the concentration distribution of the sludge corresponding to the measurement result of the interface position Is output. Therefore, in order to measure the sludge concentration distribution of the liquid to be measured, it is not necessary to move the sensor of the sludge concentration meter up and down in the sedimentation tank containing the liquid to be measured. Therefore, the time required for measuring the concentration distribution can be shortened.

  The specifying means specifies a plurality of specific interface data from the interface data in descending order of coincidence with the measurement result of the measuring means, and the output means corresponds to the specific interface data among the concentration data for each specific interface data. The related density data may be specified, the average value of the density distribution indicated by the related density data specified for each specific interface data may be calculated, and the average value of the density distribution may be output.

1 is a block diagram of a water treatment system including a concentration meter according to a first embodiment of the present invention. It is explanatory drawing which showed an example of the density data 30a. It is explanatory drawing which showed an example of measurement data. It is the figure which showed the example of a display of the density distribution of the sludge by the display part. It is a block diagram of 1 A of water treatment systems containing the concentration meter of 2nd Embodiment of this invention. It is the figure which showed an example of the smoothing process. It is a block diagram of water treatment system 1B including the concentration meter of a 3rd embodiment of the present invention. It is a block diagram of 1 C of water treatment systems containing the concentration meter of 4th Embodiment of this invention.

  Embodiments of the present invention will be described below.

(First embodiment)
FIG. 1 is a block diagram showing a water treatment system including a concentration meter according to the first embodiment of the present invention.

  In FIG. 1, a water treatment system 1 includes a treatment tank 2, a concentration meter 3 that also functions as an interface meter, and a treatment management unit 4. The processing tank 2 includes a discharge pipe 2a and a discharge valve 2b. The densitometer 3 includes a storage unit 30, a concentration sensor 31, an interface meter 32, a control unit 33, and a display unit 34. The control unit 33 includes a specifying unit 33a and an output unit 33b.

  The treatment tank 2 is fed with sewage mixed with activated sludge. The sewage is, for example, domestic wastewater or factory wastewater. In addition, the sewage mixed with activated sludge may not be flowed into the treatment tank 2, but first, the sewage may flow into the treatment tank 2, and then the activated sludge may be supplied to the treatment tank 2. The sludge mixed with activated sludge is an example of a liquid containing sludge. Hereinafter, the activated sludge is simply referred to as “sludge”.

  When the sewage mixed with sludge flows into the treatment tank 2, the sewage is stirred by a stirrer (not shown). Microorganisms in the sludge purify the sewage by decomposing organic substances contained in the sewage. When the stirring is stopped, the sludge settles with time. As the sludge sedimentation progresses, a supernatant water layer 21 is formed in the upper part of the treatment tank 2, and a sludge precipitation layer 22 is formed in the lower part of the treatment tank 2, thereby forming a sludge interface 23. . In addition, sludge sedimentation proceeds in the sludge sedimentation layer 22.

  In the present embodiment, in order to acquire data stored in the storage unit 30, first, data acquisition sewage containing sludge flows into the treatment tank 2. As the sewage for data acquisition, sewage actually processed by the water treatment system 1 is used. Then, data is acquired about the sewage for data acquisition in the processing tank 2. Thereafter, sewage for data acquisition is discharged from the treatment tank 2. Subsequently, the measurement target sewage containing sludge flows into the treatment tank 2, and the sludge interface position and sludge concentration distribution in the measurement target sewage are measured by the densitometer 3.

  The storage unit 30 is an example of a storage unit.

  The storage unit 30 is measured at different measurement periods in a period (hereinafter referred to as “sedimentation period”) in which sludge in the sewage for data acquisition in the processing tank 2 for data acquisition is settling. Stored data.

  Specifically, the storage unit 30 measures the concentration data 30a indicating the concentration distribution of the sludge in the treatment tank 2 measured during the measurement period and the measurement data during the measurement period. The interface data 30b indicating the position of the sludge interface in the treatment tank 2 is stored in association with each other.

  In the present embodiment, the storage unit 30 has concentration data 30a indicating the concentration distribution of sludge in the treatment tank 2 measured by the concentration sensor 31 during the measurement period for each different measurement period within the settling period, The interface data 30b indicating the position of the interface of the sludge in the treatment tank 2 measured by the interface meter 32 during the measurement period is stored in association with each other.

  Therefore, the storage unit 30 includes a plurality of interface data 30b indicating different positions of the sludge interface in the treatment tank 2, and a plurality of sludge concentration distributions in the treatment tank 2 corresponding to the plurality of interface data 30b. Density data 30a is stored.

  The number of measurement periods is 30 for example. The number of measurement periods is not limited to 30 and can be changed as appropriate.

  The concentration sensor 31 is, for example, a transmission ultrasonic densitometer that includes a transmission unit 31a that transmits ultrasonic waves and a reception unit 31b that receives ultrasonic waves. The transmission unit 31a and the reception unit 31b are arranged to face each other with a predetermined interval.

  The transmitter 31a transmits ultrasonic waves toward the sewage for data acquisition in a situation where the sewage for data acquisition exists in the measurement region between the transmitter 31a and the receiver 31b. A part of the ultrasonic wave transmitted from the transmitter 31a is lost due to scattering and reflection by sludge in the measurement region. For this reason, the receiving unit 31b receives an ultrasonic wave whose intensity decreases as the amount of sludge in the measurement region increases.

  The concentration sensor 31 determines the concentration of sludge existing in the measurement region based on the intensity of the ultrasonic wave received by the receiving unit 31b.

  In addition, if the concentration of sludge existing in the measurement area varies, the transmission ultrasonic densitometer cannot measure the variation (concentration distribution) of the sludge present in the measurement area and exists in the measurement area. Only one concentration measurement result is output for sewage for data acquisition.

  For this reason, when measuring the concentration distribution of the sludge in the processing tank 2 using the concentration sensor 31 which is a transmission ultrasonic densitometer, for example, it is divided into a plurality of measurement target layers for each Acm in the depth direction. When measuring the density | concentration of the sludge in each measuring object layer with respect to sewage, whenever the density | concentration sensor 31 sinks Acm in the processing tank 2, the density | concentration of sludge is measured.

  Therefore, the concentration sensor 31 represents the concentration data indicating the concentration distribution of the sludge in the treatment tank 2 as the concentration data 30a indicating the concentration at a plurality of preset positions from the water surface to the depth direction. Output.

  In the present embodiment, the concentration distribution of sludge in the treatment tank 2 is measured using the concentration sensor 31 for each measurement period within the precipitation period. Concentration data 30 a indicating the sludge concentration distribution measured by the concentration sensor 31 for each measurement period within the settling period is stored in the storage unit 30 by the control unit 33.

  FIG. 2 is an explanatory diagram showing an example of the density data 30a. In FIG. 2, in the concentration data 30a, the horizontal axis represents the depth from the surface of the sewage for data acquisition, and the vertical axis represents the concentration of sludge.

  The concentration sensor 31 is preferably removed from the treatment tank 2 after the concentration data is acquired for each measurement period within the settling period of the sewage for data acquisition.

  The interface meter 32 is an example of a measuring unit.

  The interface meter 32 transmits ultrasonic waves to the sewage in the treatment tank 2 in a state where the sewage containing sludge is in the treatment tank 2, and the reflected wave of the ultrasonic waves generated at the sludge interface 23 in the treatment tank 2. Receive. The interface meter 32 measures the position of the sludge interface 23 in the treatment tank 2 based on the time from when the ultrasonic wave is transmitted until the reflected wave is received.

  In the present embodiment, the interface meter 32 creates data representing the transition of the reception state of the reflected wave for a predetermined time after transmitting the ultrasonic wave, and calculates the time in the created data from the depth of the sewage water. The changed data is output as measurement data indicating the position of the sludge interface 23 in the treatment tank 2. In addition, the depth from the water surface of sewage respond | corresponds with progress of time until receiving the reflected wave after transmitting an ultrasonic wave.

  FIG. 3 is an explanatory diagram showing an example of measurement data. In the measurement data shown in FIG. 3, the horizontal axis represents the depth from the surface of the sewage, and the vertical axis represents the intensity of the reflected wave (the magnitude of the amplitude of the reflected wave).

  Ultrasonic waves are greatly reflected at the portion where the concentration change of the sludge is large. For this reason, the measurement data shown in FIG. 3 indicates that the sludge interface 23 exists at a depth position where the intensity of the reflected wave is strong (specifically, at a depth = 30 position). .

  Of the places where the intensity of the reflected wave is strong, the places near the water surface of the sewage are directly received by the interface meter 32 without the transmitted ultrasonic waves being reflected in the sewage. It has occurred. For this reason, the location near the water surface of the sewage among the locations where the intensity of the reflected wave is strong is not caused by the reflected wave generated at the interface.

  In addition, among the places where the intensity of the reflected wave is strong, the place near the bottom of the processing tank 2 is caused by the reflected wave generated by the transmitted ultrasonic wave being reflected by the lower part of the processing tank 2. It is a place to do. For this reason, among the places where the intensity of the reflected wave is strong, the place near the bottom of the treatment tank 2 is not caused by the reflected wave generated at the interface.

  The interface meter 32 transmits ultrasonic waves to the sewage for data acquisition in the treatment tank 2 for each measurement period within the settling period in which the sewage for data acquisition enters the treatment tank 2, and The reflected wave is received and measurement data as shown in FIG. 3 is output. The measurement data output for each measurement period within the precipitation period is stored in the storage unit 30 as interface data by the control unit 33. The interface meter 32 may measure the position of the interface a plurality of times within one measurement period within the precipitation period.

  The interface meter 32 transmits ultrasonic waves toward the measurement target sewage in the treatment tank 2 and receives the reflected waves of the ultrasonic waves in a state where the measurement target sewage containing sludge is in the treatment tank 2. The measurement data as shown in FIG. 3 is output.

  The control unit 33 is, for example, a data processor. The control unit 33 has, for example, a data acquisition mode and a measurement mode.

  The control unit 33 is set to the data acquisition mode during the precipitation period in which the sewage for data acquisition is in the treatment tank 2. In the data acquisition mode, the control unit 33 operates the concentration sensor 31 and the interface meter 32 for each measurement period within the precipitation period, and receives the concentration data from the concentration sensor 31 and the measurement data from the interface meter 32. . The control unit 33 stores the concentration data and measurement data (interface data) received during the same measurement period in the storage unit 30 in association with each other.

  The control unit 33 is set to the measurement mode during the precipitation period in which the sewage to be measured is in the treatment tank 2. When receiving the measurement data from the interface meter 32 under the measurement mode, the control unit 33 outputs data indicating the sludge concentration distribution.

  The specifying unit 33a is an example of a specifying unit.

When the specifying unit 33a receives measurement data from the interface meter 32 under the measurement mode,
The degree of coincidence between the position of the interface indicated by the measurement data from the interface meter 32 and the position of the interface indicated by each of the interface data 30b in the storage unit 30 is calculated.

  For example, for each of the interface data 30b, the specifying unit 33a calculates the absolute value of the difference between the position of the interface indicated by the interface data 30b and the position of the interface indicated by the measurement data from the interface meter 32, and the calculation result Is output as the degree of coincidence. In this case, the smaller the coincidence value, the higher the coincidence with the measurement data from the interface meter 32.

  The method for calculating the degree of coincidence can be changed as appropriate.

  For example, the specifying unit 33a may perform a matching process on each waveform of the interface data 30b in the storage unit 30 with the waveform of the measurement data from the interface meter 32, and output the degree of matching as the degree of coincidence.

  Further, the specifying unit 33a may calculate the degree of coincidence as follows.

  The specifying unit 33a specifies the interface position indicated by the measurement data from the interface meter 32, that is, the depth at which the interface 23 exists, and then the depth indicated by the horizontal axis of the measurement data shown in FIG. Among these areas, a predetermined area centering on the depth where the interface 23 exists is set as the interface existing area. Note that the size of the interface existence region can be changed as appropriate.

  When the interface 33 is set, the specifying unit 33a sets, for each interface data 30b, the same depth (hereinafter referred to as “comparison reference depth”) of the reflected wave intensity indicated by the interface data 30b and the reflected wave intensity indicated by the measurement data. The absolute value of the difference between the intensities is calculated while changing the comparison reference depth, and the absolute value of the difference is added. The specifying unit 33a multiplies the absolute value of the difference in intensity at the depth belonging to the interface existence region by a weighting coefficient B (B is a positive number of 1 or more), and adds the multiplication results. The specifying unit 33a uses the added value calculated for each interface data 30b as the degree of coincidence. In this case, the smaller the added value is, the higher the matching degree is.

  Note that the specifying unit 33a may use the added value of the absolute values of the intensity differences at the depths belonging to the interface existing region as the degree of coincidence.

  When the degree of coincidence is calculated, the identifying unit 33a identifies the interface data (hereinafter referred to as “corresponding interface data”) having the highest degree of coincidence with the measurement data from the interface meter 32 among the interface data in the storage unit 30. . When the identifying unit 33a identifies the corresponding interface data, the identifying unit 33a outputs the corresponding interface data to the output unit 33b.

  The output unit 33b is an example of an output unit.

  When the output unit 33b accepts the relevant interface data, the density data associated with the relevant interface data among the density data in the storage unit 30, that is, the density data corresponding to the relevant interface data (hereinafter referred to as “related density data”). Specified). When specifying the related density data, the output unit 33b outputs the related density data and the corresponding interface data to the display unit 34 and the process management unit 4. Note that the output unit 33b may output only the related density data among the related density data and the corresponding interface data to the display unit 34 and the process management unit 4.

  The display unit 34 is an example of a display unit.

  When receiving the related concentration data and the corresponding interface data, the display unit 34 displays the sludge concentration distribution indicated by the related concentration data and the position of the sludge interface indicated by the corresponding interface data. When only the related concentration data is received, the display unit 34 displays the sludge concentration distribution indicated by the related concentration data.

  When receiving the related concentration data and the corresponding interface data, the process management unit 4 grasps the progress status of the water treatment according to the related concentration data and the corresponding interface data.

  The process management unit 4 sets the position of the interface indicated by the corresponding interface data as a condition set in advance as a condition for removing the precipitated sludge, and the condition that the concentration distribution of the sludge indicated by the related density data removes the precipitated sludge. When the concentration distribution is set in advance, the discharge valve 2b is opened. When the discharge valve 2b is opened, the sludge precipitated in the processing tank 2 is discharged from the processing tank 2 through the discharge pipe 2a.

  Next, the operation will be described.

  First, the operation of storing the density data 30a and the interface data 30b in the storage unit 30 will be described.

  Data acquisition sewage containing sludge flows into the treatment tank 2, and then the sewage is stirred in the treatment tank 2 by a stirrer (not shown). Thereafter, the control unit 33 is set to the data acquisition mode.

  In the data acquisition mode, the control unit 33 operates the concentration sensor 31 and the interface meter 32 for each measurement period within the precipitation period, and the concentration data 30a from the concentration sensor 31 and the measurement data 30b from the interface meter 32. And accept. The control unit 33 stores the concentration data 30a and the measurement data (interface data) 30b received in the same measurement period in the storage unit 30 in association with each other.

  When the concentration data 30a and the interface data 30b are stored in the storage unit 30 for each measurement period within the settling period, sewage for data acquisition in the processing tank 2 is discarded.

  Next, the measurement operation for the sewage to be measured will be described.

  The sewage to be measured including sludge flows into the treatment tank 2, and then the sewage is stirred in the treatment tank 2 by a stirrer (not shown). Thereafter, the control unit 33 is set to the measurement mode.

  When the control unit 33 enters the measurement mode, the specifying unit 33a operates the interface meter 32 intermittently.

  Each time the measurement unit 33a receives measurement data from the interface meter 32 under the measurement mode, the specifying unit 33a calculates the degree of coincidence with the measurement data from the interface meter 32 for each of the interface data 30b in the storage unit 30.

  When the degree of coincidence is calculated, the identification unit 33a identifies the interface data having the highest degree of coincidence with the measurement data from the interface meter 32 among the interface data 30a in the storage unit 30. When the identifying unit 33a identifies the corresponding interface data, the identifying unit 33a outputs the corresponding interface data to the output unit 33b.

  When the output unit 33b receives the relevant interface data, the output unit 33b specifies the related density data associated with the relevant interface data from the density data 30a in the storage unit 30, and displays the related density data and the relevant interface data on the display unit 34. And output to the process management unit 4.

  When receiving the related concentration data and the corresponding interface data, the display unit 34 displays the sludge concentration distribution indicated by the related concentration data and the position of the sludge interface indicated by the corresponding interface data.

  FIG. 4 is a diagram showing a display example of the sludge concentration distribution on the display unit 34.

  As shown in FIG. 4, the display unit 34 displays the sludge concentration distribution indicated by the related concentration data in time series.

  Further, when receiving the related concentration data and the corresponding interface data, the processing management unit 4 grasps the progress status of the water treatment according to the related concentration data and the corresponding interface data, and the discharge valve 2b of the discharge valve 2b according to the progress status of the water treatment. Controls opening and closing.

  According to this embodiment, the storage unit 30 has a plurality of interface data 30b indicating different positions of the sludge interface in the treatment tank 2, and the concentration of sludge in the treatment tank 2 corresponding to each of the plurality of interface data 30b. A plurality of density data indicating the distribution are stored. The interface meter 32 is based on the time from when an ultrasonic wave is transmitted to the sewage to be measured in the treatment tank 2 until the reflected wave of the ultrasonic wave generated at the sludge interface in the treatment tank 2 is received. The position of the inner sludge interface 23 is measured. The identifying unit 33a identifies the interface data having the highest degree of coincidence with the measurement result of the interface meter 32 among the interface data. The output unit 33b specifies and outputs related density data corresponding to the interface data in the density data.

  For this reason, if the position of the sludge interface 23 in the sewage to be measured is measured using the reflection of ultrasonic waves at the interface 23, the sludge concentration distribution corresponding to the measurement result of the position of the interface 23 is shown. Concentration data is output. Therefore, in order to measure the concentration distribution of the sludge in the sewage to be measured, it is not necessary to move the sensor of the sludge concentration meter up and down in the treatment tank 2 containing the sewage to be measured. Therefore, the time required for measuring the concentration distribution can be shortened.

(Second Embodiment)
FIG. 5 is a block diagram showing a water treatment system 1A including a concentration meter according to the second embodiment of the present invention. In FIG. 5, the same components as those shown in FIG.

  In the water treatment system 1A shown in FIG. 5, a smoothing processing unit 33c is added to the water treatment system 1 shown in FIG. Hereinafter, the water treatment system 1A will be described focusing on differences from the water treatment system 1 shown in FIG.

  In FIG. 5, the output unit 33b outputs the related density data and the corresponding interface data to the smoothing processing unit 33c.

  The smoothing processing unit 33c is an example of a smoothing processing unit.

  Upon receiving the related density data and the corresponding interface data, the smoothing processing unit 33c performs a smoothing process on the related density data. For example, the smoothing processing unit 33c obtains a smoothing function using the related density data, and outputs a density distribution represented by the smoothing function as density data.

  FIG. 6 is an explanatory diagram showing an example of the smoothing process.

  The smoothing processing unit 33 c outputs the related density data on which the smoothing process has been executed and the corresponding interface data to the display unit 34 and the process management unit 4.

  The smoothing processing unit 33c may output only the related density data for which the smoothing process has been executed among the related density data for which the smoothing process has been executed and the corresponding interface data to the display unit 34 and the process management unit 4. .

  When the display unit 34 receives the related concentration data on which the smoothing process has been performed and the corresponding interface data, the sludge concentration distribution indicated by the related concentration data on which the smoothing process has been executed, and the position of the sludge interface indicated by the corresponding interface data And are displayed. In addition, the display part 34 displays the density distribution of the sludge which the related density data in which the smoothing process was performed shows, when only the related density data in which the smoothing process was performed is received.

  When the process management unit 4 receives the related concentration data and the corresponding interface data on which the smoothing process has been executed, the process management unit 4 grasps the progress status of the water treatment according to the related concentration data and the corresponding interface data on which the smoothing process has been executed. The treatment management unit 4 controls the opening and closing of the discharge valve 2b according to the progress status of the water treatment.

  According to the present embodiment, the smoothing processing unit 33c performs the smoothing process on the related density data and outputs the related density data on which the smoothing process has been executed. By performing the smoothing process, noise in the related density data is reduced, and the user can easily recognize the density distribution indicated by the related density data. Further, by executing the smoothing process, it becomes possible to make the display resolution smaller than the resolution of the related density data.

(Third embodiment)
FIG. 7 is a block diagram showing a water treatment system 1B including a concentration meter according to the third embodiment of the present invention. In FIG. 7, the same components as those shown in FIG.

  In the water treatment system 1B shown in FIG. 7, the specifying unit 33aB is used instead of the specifying unit 33a shown in FIG. 1, and the output unit 33bB is used instead of the output unit 33b shown in FIG. . Hereinafter, the water treatment system 1B will be described focusing on differences from the water treatment system 1 shown in FIG.

  In FIG. 7, the specifying unit 33aB is an example of a specifying unit.

  When receiving the measurement data from the interface meter 32 under the measurement mode, the specifying unit 33aB calculates the degree of coincidence with the measurement data from the interface meter 32 for each of the interface data 30b in the storage unit 30. The matching degree calculation method performed by the specifying unit 33aB is the same as the matching level calculation method performed by the specifying unit 33a.

  When the degree of coincidence is calculated, the identifying unit 33aB identifies a plurality of interface data (hereinafter referred to as “specific interface data”) in descending order of the degree of coincidence with the measurement data from the interface meter 32 from the interface data in the storage unit 30. To do.

  For example, the specifying unit 33aB specifies the specific interface data by a predetermined number of two or more in descending order of the degree of coincidence with the measurement data from the interface meter 32 from the interface data in the storage unit 30.

  When specifying the plurality of specific interface data, the specification unit 33aB outputs the plurality of specific interface data to the output unit 33bB.

  The output unit 33bB is an example of an output unit.

  When the output unit 33bB receives a plurality of specific interface data, the output unit 33bB corresponds to the related concentration data associated with the specific interface data, that is, the specific interface data among the concentration data 30a in the storage unit 30 for each specific interface data. Identify relevant concentration data.

  When the output unit 33bB specifies the related density data for each specific interface data, the output unit 33bB calculates an average value of the density distribution indicated by the related density data specified for each specific interface data.

  For example, the output unit 33bB uses the concentration indicated by each of the plurality of related concentration data, and each of the plurality of related concentration data for each of a plurality of measurement positions set in advance from the surface of the sewage toward the depth direction. The average density at the measurement position shown is calculated, and data indicating the average density at the plurality of measurement positions is used as the average value of the density distribution.

  When the average value of the density distribution is calculated, the output unit 33bB outputs the average value of the density distribution and the specific interface data to the display unit 34 and the process management unit 4. Note that the output unit 33b may output only the average value of the density distribution among the average value of the density distribution and the specific interface data to the display unit 34 and the process management unit 4.

  When the display unit 34 receives the average value of the concentration distribution and the specific interface data, the display unit 34 displays the concentration distribution of the sludge indicated by the average value of the concentration distribution and the position of the interface of the sludge indicated by the specific interface data. In addition, the display part 34 displays the density distribution of the sludge which the average value of density distribution shows, when only the average value of density distribution is received.

  When the process management unit 4 receives the average value of the concentration distribution and the specific interface data, the process management unit 4 grasps the progress of the water treatment according to the average value of the concentration distribution and the specific interface data. The treatment management unit 4 controls the opening and closing of the discharge valve 2b according to the progress status of the water treatment.

  In the present embodiment, the specifying unit 33aB specifies a plurality of specific interface data from the interface data in descending order of coincidence with the measurement data from the interface meter 32. For each specific interface data, the output unit 33bB calculates and outputs the average value of the density distribution indicated by the related density data associated with the specific interface data among the density data.

  For this reason, in this embodiment, as in the first embodiment, if the position of the sludge interface 23 in the sewage to be measured is measured using reflection of ultrasonic waves at the interface 23, the interface 23 Concentration data indicating the concentration distribution of sludge according to the position measurement result is output. Therefore, in order to measure the concentration distribution of the sludge in the sewage to be measured, it is not necessary to move the sensor of the sludge concentration meter up and down in the treatment tank 2 containing the sewage to be measured. Therefore, the time required for measuring the concentration distribution can be shortened.

  In addition, since the average value of the density distribution is output, the reliability of the output density distribution can be improved.

(Fourth embodiment)
FIG. 8 is a block diagram showing a water treatment system 1C including a concentration meter according to the fourth embodiment of the present invention. In FIG. 8, the same components as those shown in FIG. 7 are denoted by the same reference numerals.

  In the water treatment system 1C shown in FIG. 8, a smoothing processing unit 33cC is added to the water treatment system 1B shown in FIG. Hereinafter, the water treatment system 1C will be described focusing on differences from the water treatment system 1B shown in FIG.

  In FIG. 8, the output unit 33bB outputs the average value of the density distribution and the specific interface data to the smoothing processing unit 33cC.

  The smoothing processing unit 33cC is an example of a smoothing processing unit.

  When receiving the average value of the density distribution and the specific interface data, the smoothing processing unit 33cC performs a smoothing process on the average value of the density distribution. For example, the smoothing processing unit 33cC obtains a smoothing function using the average value of the density distribution, and outputs the average value of the density distribution represented by the smoothing function as density data.

  The smoothing processing unit 33cC outputs the average value of the density distribution subjected to the smoothing processing and the specific interface data to the display unit 34 and the process management unit 4.

  The smoothing processing unit 33cC outputs, to the display unit 34 and the process management unit 4, only the average value of the density distribution subjected to the smoothing process among the average value of the density distribution subjected to the smoothing process and the specific interface data. May be.

  When the display unit 34 receives the average value of the concentration distribution subjected to the smoothing process and the specific interface data, the sludge concentration distribution indicated by the average value of the concentration distribution subjected to the smoothing process and the sludge indicated by the specific interface data And the position of the interface. In addition, the display part 34 displays the density distribution of the sludge which the average value of the density distribution in which the smoothing process was performed shows, when only the average value of the density distribution in which the smoothing process was performed is received.

  When the process management unit 4 receives the average value of the concentration distribution subjected to the smoothing process and the specific interface data, the process management unit 4 displays the progress of the water treatment according to the average value of the concentration distribution subjected to the smoothing process and the specific interface data. To grasp. The treatment management unit 4 controls the opening and closing of the discharge valve 2b according to the progress status of the water treatment.

  According to the present embodiment, the smoothing processing unit 33cC performs the smoothing process on the average value of the density distribution, and outputs the average value of the density distribution on which the smoothing process has been performed. By performing the smoothing process, noise at the average value of the density distribution is reduced, and the user can easily recognize the density distribution indicated by the average value of the density distribution. Further, by performing the smoothing process, it becomes possible to make the display resolution smaller than the resolution of the average value of the density distribution.

  In each of the above embodiments, as the concentration sensor 31, an optical concentration sensor that detects the concentration of sludge using light may be used. The optical density sensor measures light propagation loss due to sewage by transmitting light between the light emitting element and the light receiving element in a situation where sewage exists between the pair of the light emitting element and the light receiving element. Thus, the concentration of sludge in the sewage is detected.

  Even when an optical density sensor is used as the concentration sensor 31, the sludge concentration distribution in the treatment tank 2 is measured by measuring the concentration of sludge every time the concentration sensor 31 is submerged A cm in the treatment tank 2.

  In each embodiment described above, the illustrated configuration is merely an example, and the present invention is not limited to the configuration.

1, 1A, 1B, 1C Water treatment system 2 Treatment tank 2a Discharge pipe 2b Discharge valve 21 Supernatant water layer 22 Sludge sedimentation layer 23 Interface 3 Concentration meter 31 Concentration sensor 31a Transmitter 31b Receiver 32 Interface meter 33, 33A, 33B, 33C Control unit 33a, 33aB Identification unit 33b, 33bB Output unit 33c, 33cC Smoothing processing unit 34 Display unit 4 Process management unit

Claims (6)

A densitometer for measuring the concentration distribution of the sludge in a treatment tank for precipitating the sludge contained in the liquid;
A storage for storing a plurality of interface data indicating different positions of the sludge interface in the treatment tank and a plurality of concentration data indicating the concentration distribution of the sludge in the treatment tank corresponding to each of the plurality of interface data. Means,
In a state where the liquid to be measured including sludge is in the processing tank, the ultrasonic wave is transmitted to the liquid to be measured and the reflected wave of the ultrasonic wave generated at the interface of the sludge in the processing tank is received, Measuring means for measuring the position of the sludge interface in the treatment tank based on the time from transmitting the ultrasonic wave to receiving the reflected wave;
The degree of coincidence between the position of the interface indicated in the measurement result of the measurement means and the position of the interface indicated in each of the plurality of interface data in the storage means is calculated, and the measurement of the measurement means is included in the interface data. A specific means for identifying the corresponding interface data having the highest degree of coincidence with the result,
A concentration meter comprising: output means for specifying related density data corresponding to the interface data specified by the specifying means among the density data in the storage means, and outputting the related density data. The densitometer according to claim 1,
A densitometer further comprising smoothing processing means for executing a smoothing process on the related density data output from the output means and outputting the related density data on which the smoothing process has been executed. A densitometer for measuring the concentration distribution of the sludge in a treatment tank for precipitating the sludge contained in the liquid;
A storage for storing a plurality of interface data indicating different positions of the sludge interface in the treatment tank and a plurality of concentration data indicating the concentration distribution of the sludge in the treatment tank corresponding to each of the plurality of interface data. Means,
In a state where the liquid to be measured including sludge is in the processing tank, the ultrasonic wave is transmitted to the liquid to be measured and the reflected wave of the ultrasonic wave generated at the interface of the sludge in the processing tank is received, Measuring means for measuring the position of the sludge interface in the treatment tank based on the time from transmitting the ultrasonic wave to receiving the reflected wave;
The degree of coincidence between the position of the interface indicated in the measurement result of the measuring means and the position of the interface indicated in each of the plurality of interface data in the storage means is calculated, and the measurement is performed from the interface data in the storage means. A specifying means for specifying a plurality of specific interface data in descending order of coincidence with the measurement results of the means;
For each specific interface data specified by the specifying means, related density data corresponding to the specific interface data is specified out of the density data in the storage means, and related density data specified for the specific interface data And an output means for calculating an average value of the density distribution indicated by and outputting the average value of the density distribution. The densitometer according to claim 3, wherein
A densitometer further comprising smoothing processing means for executing a smoothing process on the average value of the density distribution output from the output means and outputting an average value of the density distribution subjected to the smoothing process. The densitometer according to claim 1 or 3,
A densitometer further comprising display means for displaying both the output of the output means and the measurement result of the measurement means, or the output of the output means. About the densitometer according to claim 2 or 4,
A densitometer further comprising display means for displaying both the output of the smoothing processing means and the measurement result of the measuring means, or the output of the smoothing processing means.