JP5100155B2 - Water treatment equipment - Google Patents

Description

  The present invention relates to a water treatment apparatus, and more particularly to a water quality detection sensor installed in a water retention area where treated water stays in the water treatment apparatus.

Conventionally, in various water treatment equipment that treats treated water such as domestic wastewater discharged from ordinary households and sewage such as industrial wastewater, a water quality detection sensor is installed in the water retention area where the treated water stays. A configuration is known in which various water qualities such as turbidity and SS are detected by this water quality detection sensor. By the way, in such a water quality detection sensor, there is a concern that the sensor detection performance may be deteriorated due to deterioration over time due to long-term use, and therefore, it is preferable to periodically perform a sensor calibration process of the water quality detection sensor. Regarding this sensor calibration, as described in Patent Document 1 below, the operator manually takes out the water quality detection sensor from the inside of the treatment tank to the outside of the treatment tank, and calibrates the sensor in the atmosphere or fresh water outside the treatment tank. Processing was common.
JP 2001-56291 A

However, in the method described in Patent Document 1, since it is necessary for an operator to go to each water treatment apparatus installed in the field and directly perform the sensor calibration process of the water quality detection sensor, there is a problem that it takes time to calibrate the sensor. I have it.
Therefore, the present invention has been made in view of such points, and in a water treatment apparatus having a configuration in which a water quality detection sensor is installed in a water retention region where treated water stays, the sensor calibration of the water quality detection sensor is rational. It is an object of the present invention to provide an effective technique for performing the following.

  The present invention is configured to solve the above problems.

  A water treatment apparatus according to the present invention is a water treatment apparatus having a structure in which a water treatment mechanism that performs water treatment on water to be treated is accommodated in a treatment tank, and includes at least a water quality detection sensor and a control unit.

A water quality detection sensor is comprised as a sensor which detects the water quality information in the water retention area | region where to-be-processed water retains among water treatment mechanisms. The “water treatment mechanism” here is a mechanism for performing predetermined water treatment on various types of water to be treated. Typically, a site for removing impurities and solids, organic contamination in the water to be treated It is comprised by combining suitably the site | part which carries out an aerobic process, anaerobic process, or the filtration process of a substance, the site | part which performs temporary storage in the to-be-processed water, and disinfection process, etc. as needed. The “water quality information” here includes water turbidity, transparency, SS (suspended suspended solid amount), BOD (biochemical oxygen demand), DO (dissolved oxygen), pH, ultraviolet light (UV ) Information on water quality such as absorbance is widely included.
The control means is configured to change the relative height between the water level of the water to be treated and the water quality detection sensor retained in the water retention area, so that the water quality detection sensor is submerged in water, the water immersion state It is comprised as a means which can be controlled to the water immersion cancellation | release state which cancel | released.

In the present invention, the water quality detection sensor is configured to be fixed at a predetermined position in the water retention region. Further, the control means is configured to change the water level of the water to be treated retained in the water retention area by controlling the inflow amount or the outflow amount of the water to be treated in the water retention area. As used herein, “control of inflow or outflow of water to be treated” refers to such aspects as stopping or starting the inflow or outflow of water to be treated or changing the inflow or outflow of water to be treated. Control is possible.
In such a configuration, the water quality detection sensor is controlled to be in a flooded state where the water is immersed in the water by the control means when the water quality is detected. On the other hand, at the time of sensor calibration, this water quality detection sensor is controlled to be in a water-released state in which water is released by the control means while being closed in the treatment tank.

According to such a configuration of the water treatment apparatus according to the present invention, it is possible to automatically perform sensor calibration of the water quality detection sensor by controlling the water quality detection sensor to the inundation release state by the control means at the time of sensor calibration. It is reasonable that the operator does not have to take out the water quality detection sensor itself directly from the inside of the processing tank to the outside of the processing tank during sensor calibration.
Moreover, in this Embodiment, since a water quality detection sensor is controlled to a water immersion cancellation | release state in the state closed in the processing tank at the time of sensor calibration, a sensor calibration process becomes difficult to be influenced by sunlight or disturbance light. Therefore, the accuracy of the sensor calibration process is increased, and it is not necessary to provide a determination circuit or the like for determining the influence of disturbance, and the structure is simplified. In particular, in household water treatment equipment that accepts and treats domestic wastewater, the frequency of maintenance and inspection is lower than that of factories (for example, once every four months), and the water quality detection sensor is used over a long period of time. However, there is a high demand for proper sensor calibration before the next maintenance inspection. Therefore, as in this configuration, a structure in which the sensor calibration process is not easily affected by disturbance is particularly effective.

In addition, by changing the water level of the water to be treated that has accumulated in the water retention area, it is possible to switch between the inundation state and the inundation release state of the fixed water quality detection sensor on the water retention area side. The structure is simplified as compared with the configuration driven in the vertical direction, and the effect of reducing the apparatus cost can be obtained.

The water treatment apparatus of the further form concerning this invention is further provided with a pressure detection part and a calibration process part. The pressure detection unit has a function of detecting pressure information acting on the water quality detection sensor. The calibration processing unit has a function of performing sensor calibration of the water quality detection sensor. And after the control means controls the water quality detection sensor to the inundation release state , the calibration processing unit operates when it is determined that the pressure acting on the water quality detection sensor corresponds to the atmospheric pressure based on the pressure information. Is done. That is, the sensor calibration is performed after confirming that the water quality detection sensor is exposed to the atmosphere and is in a preferable state for the sensor calibration. Such a configuration is effective in increasing the reliability of the sensor calibration process.

In the water treatment apparatus of the further form concerning this invention, when the said calibration process part has discriminate | determined that the pressure which acts on a water quality detection sensor corresponds to atmospheric pressure based on pressure information , the said water quality detection sensor The sensor calibration is performed by using only the detection information detected in the above as sensor calibration data . According to such a configuration, it is possible to use only appropriate detection information as sensor calibration data, so that the reliability of the sensor calibration process can be further improved.

  As described above, according to the present invention, in the water treatment apparatus having a configuration in which the water quality detection sensor is installed in the water retention area where the water to be treated is retained, the water quality detection sensor is closed in the treatment tank particularly during sensor calibration. By adopting a configuration that controls the state to be in a water-released state, the operator can automatically calibrate the sensor without directly removing the water quality detection sensor out of the treatment tank. It became possible to perform the calibration rationally.

  Below, the water treatment apparatus of one embodiment in the present invention is explained based on a drawing. In addition, this Embodiment demonstrates the construction technique of the water treatment apparatus (septic tank) which performs the water treatment of the to-be-processed water discharged | emitted from a general household.

The processing flow of the water treatment apparatus 100 of one embodiment of the “water treatment apparatus” in the present invention is shown in FIG.
As shown in FIG. 1, the water treatment apparatus 100 of this Embodiment has accommodated various water treatment mechanisms in the tank main body 101 shape | molded in the tank shape. This tank body 101 corresponds to a “treatment tank” in the present invention. When roughly classified, each water treatment mechanism of the contaminant removal tank 110, the anaerobic filter bed tank 130, the contact aeration tank 150, the precipitation tank 170, and the disinfection tank 190 from the upstream (left side in FIG. 1) corresponding to the order of the treatment steps. Is accommodated in the tank body 101. The waste water that has flowed into the tank body 101 having such a structure is subjected to water treatment in the contaminant removal tank 110, the anaerobic filter bed tank 130, the contact aeration tank 150, the sedimentation tank 170, and the disinfection tank 190, and then the tank. It is discharged outside the main body 101. In the present embodiment, waste water to be treated in each tank and water flowing in the treatment process for treating the waste water are referred to as “water to be treated” or “water”.

  The contaminant removal tank 110 is disposed in the uppermost stream portion of the tank body 101, and is configured such that water to be treated flows into the contaminant removal tank 110 through an inlet (not shown). The contaminant removal tank 110 is a tank that performs a process of separating contaminants contained in the treated water from the treated water using solid-liquid separation means such as an inflow baffle (not shown). Performs solid-liquid separation function. The water after the contaminant removal process is performed in the contaminant removal tank 110 is transferred to the anaerobic filter bed tank 130 disposed downstream thereof.

  The anaerobic filter bed tank 130 is configured as a treatment tank having a function of anaerobically treating (reducing) organic pollutants in the water to be treated. Typically, the anaerobic filter bed is filled with a predetermined amount of filter medium to which anaerobic microorganisms for anaerobically treating organic pollutants are attached. This anaerobic treatment can reduce BOD and reduce sludge. The water after being treated in the anaerobic filter bed tank 130 is transferred to a contact aeration tank 150 disposed downstream thereof.

  The contact aeration tank 150 is configured as a treatment tank having a function of aerobically treating (oxidizing) organic pollutants in the water to be treated. Typically, a predetermined amount of contact material to which aerobic microorganisms for aerobically treating organic pollutants adhere is filled, and air fed from a blower (blower) is supplied to the contact material. In this configuration, the aerobic microorganisms attached to the contact material aerobically treat organic pollutants in the water to be treated with the help of oxygen in the air sent from a blower (blower). A part of the water treated in the contact aeration tank 150 is circulated as circulating water to the contaminant removal tank 110 by a transfer means such as a transfer pump, while the rest is transferred to the precipitation tank 170 disposed downstream. Advection. The circulating water circulated to the contaminant removal tank 110 is typically water containing solids such as sludge.

  The sedimentation tank 170 is configured as a treatment tank having a function of temporarily retaining water transferred from the contact aeration tank 150 to precipitate and remove suspended substances in the water. The water that has been treated in the settling tank 170 is transferred to a disinfection tank 190 disposed downstream thereof.

  The disinfecting tank 190 is a processing tank having a function of disinfecting water flowing from the treating water tank 170. Typically, the disinfecting tank 190 is filled with a disinfectant (solid chlorine agent) for performing disinfecting treatment (described later). The medicine cylinder 191) is provided. The water sterilized in the sterilization tank 190 is discharged to the outside of the tank body 101.

  Here, FIG. 2 is referred to regarding a specific configuration of the anaerobic filter bed tank 130 described above. FIG. 2 shows the internal structure of the anaerobic filter bed tank 130 of the present embodiment. As shown in FIG. 2, the anaerobic filter bed tank 130 of the present embodiment includes an anaerobic filter bed 131 filled with a filter medium 131a, a drain pump 132, a water level detection unit 133, and a water quality detection sensor 140.

  The drainage pump 132 is configured as a pump that drains water after being processed in the anaerobic filter bed tank 130 to transfer the water to the contact aeration tank 150. Typically, the drainage pump 132 is configured by an airlift pump that performs drainage using an airlift action (also referred to as “air flow action”), an electric submersible pump, or the like. Further, the drain pump 132 is configured to be used for the purpose of lowering the water level in the anaerobic filter bed tank 130 in “sensor air calibration control” described later.

  The water level detection unit 133 has a function of detecting the water level in the anaerobic filter bed tank 130, and typically detects that the water level in the tank has become a low water level (LWL) or a high water level (HWL). It is constituted by a water level sensor, for example, a float type water level sensor. The water level information detected by the water level detection unit 133 is output to the control unit 210 of the sensor calibration system 200 described later.

  The water quality detection sensor 140 has a function of detecting the water quality in the anaerobic filter bed tank 130 as the “water retention region” in the present invention, and typically includes turbidity, transparency, and SS (floating suspended solid content). ) And the like are configured as a water quality detection sensor. Although details will be described later, the water quality detection sensor 140 is configured to be fixed at a predetermined position in the anaerobic filter bed tank 130, and when the water level of the anaerobic filter bed tank 130 is at a high water level (HWL), When at least the detection portion (substantially sensing portion) is in a flooded state, but the water level of the anaerobic filter bed tank 130 reaches a low water level (LWL), the detection portion is in a flooded release state, that is, exposed to the atmosphere. It is arranged to be in a state. This water quality detection sensor 140 corresponds to the “water quality detection sensor” in the present invention.

  Here, FIG. 3 is referred to regarding the specific configuration of the water quality detection sensor 140 and the system of the sensor calibration system 200 including the water quality detection sensor 140. FIG. 3 shows a system configuration of the sensor calibration system 200 of the present embodiment. As shown in FIG. 3, the sensor calibration system 200 according to the present embodiment is mainly composed of a water quality detection sensor 140, a drainage pump 132, a water level detection unit 133, and a control unit 210.

  The water quality detection sensor 140 of the present embodiment is configured to accommodate at least a water quality detection unit 141, a pressure detection unit 145, an arithmetic processing unit 146, and a display unit 147 in the sensor housing 140a. The water quality detection unit 141 is a part of the water quality detection sensor 140 that substantially detects the quality of the water to be treated in the anaerobic filter bed tank 130 and is configured as a so-called “transmitted light type water quality sensor”. The The water quality detection unit 141 includes a light projecting unit 142 having a light projecting element such as an LED, a light receiving unit 143 having a light receiving element, and a sample (in a flooded state between the light projecting unit 142 and the light receiving unit 143). The sample cell unit 144 in which the water to be treated in the anaerobic filter bed tank 130 stays.

  The incident light or transmitted light irradiated from the light projecting unit 142 and passed through the sample cell unit 144 is converted into an electric signal by the light receiving element of the light receiving unit 143 and output to the arithmetic processing unit 146. In the arithmetic processing unit 146, the absorbance is calculated based on the electrical signal in the light receiving element of the light receiving unit 143. The absorbance is typically obtained from the ratio of the light intensity detected by the light receiving unit 143 when the sample is present in the sample cell unit 144 and when there is no sample. In the calculation processing unit 146, water quality information such as turbidity is further calculated based on the calculated absorbance and output to the display unit 147 and the control unit 210. For example, when detecting turbidity as water quality information, a calibration curve indicating the relationship between light intensity and turbidity created in advance is used, and the turbidity is converted from the detected light intensity.

  The pressure detection unit 145 is configured as a pressure sensor that detects pressure acting on the water quality detection sensor 140. The pressure detection information detected continuously or at regular intervals by the pressure detection unit 145 is output to the control unit 210 via the arithmetic processing unit 146 in the same manner as the water quality information detected by the water quality detection sensor 140. . The pressure detection unit 145 corresponds to the “pressure detection unit” in the present invention. As shown in FIG. 3, the pressure detection unit 145 may be configured to be housed in the sensor housing 140 a of the water quality detection sensor 140, that is, a component of the water quality detection sensor 140, or may be a water quality detection sensor. 140 may be configured separately.

  The control unit 210 has a function of controlling the drainage pump 132 based on information output from the arithmetic processing unit 146 of the water quality detection sensor 140 and information output from the water level detection unit 133. The control unit 210 may be used only for controlling the drain pump 132 in the water treatment apparatus 100, or may be used for controlling another device in addition to the drain pump 132. The control unit 210 is installed for one or a plurality of water treatment apparatuses 100. The installation location of the control unit 210 in this case may be a region near the installation location where the water treatment apparatus 100 itself is installed, or may be separated from the water treatment device 100 instead of or in addition to the vicinity region. Thus, it may be a remote area where remote monitoring is performed.

  By the way, when the water quality detection sensor 140 having the above-described configuration is used for a long period of time, there is a concern that the light projection amount of the light projecting element of the light projecting unit 142 and the light sensitivity of the light receiving element of the light receiving unit 143 may decrease due to deterioration over time. Is done. Therefore, it is preferable that the water quality detection sensor 140 is periodically calibrated to appropriately detect the water quality. Conventionally, this sensor calibration processing is generally performed in the atmosphere or fresh water outside the processing tank by an operator manually taking out the water quality detection sensor itself from the processing tank to the outside of the processing tank. However, in this method, it is necessary for the operator to go to each water treatment device installed in the field and directly perform the sensor calibration processing of the water quality detection sensor, and this has the problem that it takes time and effort to calibrate the sensor. A rational calibration process was desired. Therefore, the present inventor has conceived control using the sensor calibration system 200 of the present embodiment in order to rationalize the calibration process of the water quality detection sensor.

  Here, sensor atmosphere calibration control for calibrating the water quality detection sensor 140 to the atmosphere will be described with reference to FIGS. Here, FIG. 4 shows a processing flow relating to sensor atmospheric calibration control of the water quality detection sensor 140 of the present embodiment, and FIG. 5 shows an anaerobic filter bed equipped with the water quality detection sensor 140 of the present embodiment. The state at the time of sensor atmospheric calibration in the tank 130 is shown.

  As shown in FIG. 4, the sensor atmospheric calibration control of the present embodiment is made possible by sequentially performing steps S101 to S104. This series of sensor atmospheric calibration control may be performed periodically by control of a timer or the like, or may be performed starting from a manual operation such as a specific operation switch.

  First, in step S101, sensor cleaning of the water quality detection sensor 140 is performed. This sensor cleaning can be performed by a structure that applies a water flow to the water quality detection sensor 140, a bubbling structure, a structure that injects pressure water, and the like. This sensor cleaning can be omitted if necessary.

  Next, in step S <b> 102, the control unit 210 controls the drainage pump 132 to perform drainage control for draining the water in the anaerobic filter bed tank 130 to the downstream contact aeration tank 150. By this drainage control, as shown in FIG. 5, the water level in the anaerobic filter bed tank 130 can be lowered to a low water level (LWL), and the water quality detection unit 141 of the water quality detection sensor 140 is exposed to the atmosphere. Is formed. That is, the water level of the water to be treated in the anaerobic filter bed tank 130 is made variable by the drain pump 132 by the control unit 210, and thereby the relative level between the water level of the water to be treated in the anaerobic filter bed tank 130 and the water quality detection sensor 140. The height is variable, and the water quality detection sensor 140 is set in a flooded state at the time of water quality detection, and is set in a flooded release state at the time of sensor calibration. Therefore, the “control means” in the present invention is configured by the drain pump 132 and the control unit 210 that controls the drain pump 132 here.

  Next, the sensor atmospheric exposure is detected in step S103, and it is detected whether or not the water quality detection sensor 140 is reliably exposed to the atmosphere and is in a preferable state for performing atmospheric calibration. Specifically, based on the pressure detection information detected by the pressure detection unit 145, when the detected pressure matches the atmospheric pressure, it is determined that the water quality detection sensor 140 is exposed to the atmosphere. Further, based on the water level detection information detected by the water level detection unit 133, when the water level in the anaerobic filter bed tank 130 is a low water level (LWL), it is determined that the water quality detection sensor 140 is exposed to the atmosphere. To do. In the present embodiment, it is preferable to determine whether or not the water quality detection sensor 140 is exposed to the atmosphere using detection information of at least one of the pressure detection unit 145 and the water level detection unit 133.

  If necessary, it is possible to employ a configuration in which a step for cleaning the water quality detection sensor 140 is provided at the end of step S103 or at the end of step S102 described above. In this case, it is preferable to perform sensor cleaning using wiper-type cleaning that wipes and cleans the sensor surface using a wiper member, air-type cleaning using air injection, or the like. According to such a configuration, although the drainage control is finished, the sensor air exposure is not properly performed due to reasons such as water droplets remaining on the sensor portion of the water quality detection sensor 140. It becomes possible to deal with cases.

  When it is determined in step S103 that the water quality detection sensor 140 is exposed to the atmosphere, in step S104, the arithmetic processing unit 146 that performs sensor atmosphere calibration of the water quality detection sensor 140 is activated to automatically perform sensor atmosphere calibration. . Therefore, the arithmetic processing unit 146 constitutes the “calibration processing unit that performs sensor calibration of the water quality detection sensor” in the present invention. According to such a configuration, the sensor calibration is performed after the pressure detection unit 145 or the water level detection unit 133 detects that the water quality detection sensor 140 is exposed to the atmosphere, so that the reliability of the sensor calibration is increased. On the other hand, if it is determined in step S103 that the water quality detection sensor 140 is not exposed to the atmosphere, step S103 is continued. The sensor air calibration of the water quality detection sensor 140 is performed in the arithmetic processing unit 146. Note that step S103 may be omitted as necessary. In this case, it is possible to employ a configuration in which the process automatically proceeds to step S104 after a predetermined time has elapsed from the start of drainage control in step S102 by the control of a timer or the like.

  In step S <b> 104, incident light or transmitted light that has been irradiated from the light projecting unit 142 and passed through the sample cell unit 144 with the water quality detection sensor 140 being exposed to the atmosphere has a light intensity by the light receiving element of the light receiving unit 143. It is converted into an electrical signal. At this time, since there is almost no water to be treated in the sample cell unit 144, this detection information in the atmosphere is output to the arithmetic processing unit 146 as sensor atmospheric calibration data. For example, when detecting turbidity as water quality information, based on the detection result at this time, the conversion coefficient in the case of zero turbidity is obtained and stored. The turbidity of is calculated.

  In the present embodiment, pressure detection by the pressure detection unit 145 is continued even during sensor atmospheric calibration, and the pressure acting on the water quality detection sensor 140 is detected based on the pressure information detected by the pressure detection unit 145. Only detection information detected by the water quality detection sensor 140 when it corresponds to atmospheric pressure is preferably used as sensor atmospheric calibration data. For example, even if the water level rises carelessly at the time of sensor air calibration and the water quality detection sensor 140 is in a flooded state, the detection information at that time is canceled and not used as sensor air calibration data. Can do. According to such a configuration, it is possible to use only appropriate detection information as sensor atmospheric calibration data, so that the reliability of sensor atmospheric calibration can be improved. If necessary, the present configuration for continuing the pressure detection by the pressure detection unit 145 even during sensor atmospheric calibration can be omitted.

  As described above, if the water treatment apparatus 100 of the present embodiment is used, the sensor air calibration of the water quality detection sensor 140 can be automatically performed in the anaerobic filter bed tank 130. Specifically, all the series of processes from the process of exposing the water quality detection sensor 140 to the surface of the water to the completion of the atmospheric calibration process are performed with the water quality detection sensor 140 disposed in the anaerobic filter bed tank 130. It becomes possible to carry out comprehensively and automatically. Thus, it is reasonable that the operator does not have to take out the water quality detection sensor 140 itself directly from the inside of the processing tank to the outside of the processing tank at the time of sensor calibration. In particular, by using a configuration in which the water quality detection sensor 140 is exposed to the atmosphere by lowering the water level in the anaerobic filter bed tank 130 using the drain pump 132 during sensor air calibration, the water quality detection sensor 140 is moved vertically. Since the structure is simplified compared to the driving configuration, an effect of reducing the apparatus cost can be obtained.

  Moreover, in this Embodiment, since air | atmosphere calibration is performed inside the tank main body of the state closed with the manhole cover etc., a sensor calibration process becomes difficult to receive to the influence by sunlight or disturbance light. Therefore, the accuracy of the atmospheric calibration process is improved, and it is not necessary to provide a determination circuit or the like for determining the influence of disturbance, and the structure is simplified. In particular, in a domestic water treatment apparatus that accepts and processes domestic wastewater, the frequency of maintenance and inspection is lower than that of a factory or the like (for example, once every four months), and the water quality detection sensor 140 has a long period of time. When used, there is a high demand for proper sensor calibration before the next maintenance inspection. Therefore, the structure of the present embodiment in which the sensor calibration process is not easily affected by disturbance is particularly effective.

[Other Embodiments]
In addition, this invention is not limited only to said embodiment, A various application and deformation | transformation can be considered. For example, each of the following embodiments to which the above embodiment is applied can be implemented.

  In the above embodiment, the sensor air calibration of the water quality detection sensor 140 attached to the anaerobic filter bed tank 130 is described as the treatment area where the water level fluctuates, but the sensor air calibration of the water quality detection sensor installed in another treatment area. Similarly, the present invention can be applied to sensor air calibration of a water quality detection sensor mounted in a treatment area where the water level does not change. 6 and 7 are referred to regarding the sensor air calibration of the water quality detection sensor 193 attached to the disinfection tank 190 as a treatment area where the water level does not change. Here, FIG. 6 shows a state of water quality detection in the disinfection tank 190 to which the water quality detection sensor 193 of the present embodiment is mounted, and FIG. 7 shows the water quality detection sensor 193 of the present embodiment mounted. The state at the time of sensor atmospheric calibration is shown in the sterilized tank 190.

  As shown in FIG. 6, the disinfection tank 190 is similar to the drug cylinder 191 filled with a disinfectant (solid chlorine agent) for disinfecting the water to be treated, the drain pump 192 similar to the drain pump 132, and the water quality detection sensor 140. The water quality detection sensor 193 is fixed to a predetermined position in the disinfection tank 190. The water quality detection sensor 193 has a function of detecting the water quality in the disinfection tank 190 as the “water retention area” in the present invention. The water quality detection sensor 193 corresponds to the “water quality detection sensor” in the present invention. The drainage pump 192 is stopped during normal operation, that is, when water quality is detected by the water quality detection sensor 193, while being operated during sensor air calibration, the water in the disinfection tank 190 is forcibly drained.

Therefore, in the disinfection tank 190, the water level in the tank does not change during normal operation because the water level in the tank is defined by the discharge pipe 190a. On the other hand, as shown in FIG. 7, at the time of sensor atmospheric calibration, the drainage pump 192 is operated, and the drainage pump 192 drains until the water quality detection sensor 193 reaches a water level exposed to the atmosphere. That is, the same processing as step S102 in FIG. 4 is performed. Thereafter, the sensor atmospheric calibration can be automatically performed by the same processing as steps S103 and S104 in FIG.
According to such a configuration, it is possible to automatically perform the sensor air calibration of the water quality detection sensor 193 in the disinfection tank 190 as in the case of performing the sensor air calibration of the water quality detection sensor 140 in the anaerobic filter bed tank 130. Because it is reasonable.

  In the above embodiment, the water quality detection sensor is submerged in water by changing the water level of the water to be treated in the water retention area such as the anaerobic filter bed tank 130 and the disinfection tank 190, and Although the case of controlling to the inundation release state in which the inundation state has been released has been described, in the present invention, the vertical position relative to the water level is automatically changed by driving the water quality detection sensor side in the vertical direction instead of or in addition to this configuration. Accordingly, it is possible to adopt a configuration in which the water quality detection sensor is switched between the flooded state and the flooded release state. In addition, when adopting a configuration for changing the water level of the water to be treated retained in the water retention region, including the configuration using means such as the discharge pumps 132 and 192 of the above embodiment, the water to be treated in the water retention region. A configuration for controlling the inflow amount or the outflow amount can be appropriately used.

  Moreover, in the said embodiment, although the sensor calibration in the water quality detection sensor which detects turbidity of a to-be-processed water, transparency, and SS was described as a typical example, as other water quality, BOD (biochemical oxygen demand amount), The present invention can also be applied to sensor calibration in a water quality detection sensor that detects information about water quality such as DO (dissolved oxygen), pH, and ultraviolet (UV) absorbance.

  Moreover, in the said embodiment, each water treatment mechanism of the contaminant removal tank 110, the anaerobic filter bed tank 130, the contact aeration tank 150, the sedimentation tank 170, and the disinfection tank 190 is accommodated in the tank main body 101. However, in the present invention, the combination of the water treatment mechanisms accommodated in the tank body 101 can be changed as appropriate according to the design specifications and the like.

It is a figure which shows the processing flow of the water treatment apparatus 100 of one Embodiment of the "water treatment apparatus" in this invention. It is a figure which shows the structure in the tank of the anaerobic filter bed tank 130 of this Embodiment. It is a figure which shows the system configuration | structure of the sensor calibration system 200 of this Embodiment. It is a figure which shows the processing flow regarding the sensor air | atmosphere calibration control of the water quality detection sensor 140 of this Embodiment. It is a figure which shows the mode at the time of sensor atmospheric calibration in the anaerobic filter bed tank 130 with which the water quality detection sensor 140 of this Embodiment was mounted | worn. It is a figure which shows the mode at the time of water quality detection in the disinfection tank 190 with which the water quality detection sensor 193 of this Embodiment was mounted | worn. It is a figure which shows the mode at the time of sensor air | atmosphere calibration in the disinfection tank 190 with which the water quality detection sensor 193 of this Embodiment was mounted | worn.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Water treatment apparatus 101 ... Tank main body 110 ... Contaminant removal tank 130 ... Anaerobic filter bed tank 131 ... Anaerobic filter bed 131a ... Filter medium 132 ... Drain pump 133 ... Water level detection part 140 ... Water quality detection sensor 140a ... Sensor housing 141 ... Water quality Detection unit 142 ... Projection unit 143 ... Light reception unit 144 ... Sample cell unit 145 ... Pressure detection unit 146 ... Calculation processing unit 147 ... Display unit 150 ... Contact aeration tank 170 ... Precipitation tank 190 ... Disinfection tank 190a ... Discharge pipe 191 ... Drug cylinder 192 ... Drain pump 193 ... Water quality detection sensor 200 ... Sensor calibration system 210 ... Control unit

Claims (3)

A water treatment device that houses a water treatment mechanism for treating water to be treated in a treatment tank,
A water quality detection sensor for detecting water quality information in a water retention region where treated water stays in the water treatment mechanism;
By varying the relative height between the water level of the water to be treated that has accumulated in the water retention area and the water quality detection sensor, the water quality detection sensor is submerged in water, and Control means that can be controlled to the unlocked release state,
With
The water quality detection sensor is configured to be fixed at a predetermined position of the water retention region,
The control means is configured to vary the water level of the water to be treated retained in the water retention region by controlling the inflow amount or the outflow amount of the water to be treated in the water retention region,
When the water quality is detected, the water quality inspection sensor is controlled to be in the flooded state by the control means, and at the time of sensor calibration, the water quality inspection sensor is controlled to be in the flooded release state by the control means while being closed in the treatment tank. Water treatment device characterized by. The water treatment device according to claim 1 ,
A pressure detection unit for detecting pressure information acting on the water quality detection sensor;
A calibration processing unit for calibrating the water quality detection sensor;
With
After the control means controls the water quality detection sensor to the inundation release state, the calibration processing unit operates when it is determined that the pressure acting on the water quality detection sensor corresponds to atmospheric pressure based on the pressure information. The water treatment apparatus characterized by the above-mentioned. The water treatment device according to claim 2 ,
The calibration processing unit determines only the detection information detected by the water quality detection sensor as sensor calibration data when determining that the pressure acting on the water quality detection sensor corresponds to atmospheric pressure based on the pressure information. A water treatment apparatus characterized by using a sensor calibration .

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