JP5343891B2 - Water treatment system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water treating system capable of preventing deterioration of the quality of treated water even when the system has a long feed-water waiting time. <P>SOLUTION: The system includes a raw water line L1, a filtration device 4, a treated water line L2, a treated water blow line L8, a treated water blow valve 24, a flowmeter 19 used as a flowing state detector, and a controller 30. The controller 30 further includes a flow stop time measuring section for measuring a flow stop time of the treated water W2 when it is detected that the treated water W2 flow does not flow, a prescribed time lapse determination section for determining whether the flow stop time has lapsed over a first prescribed time, and a treated water blow valve control section for controlling opening/closing of the treated water blow valve 24 on the basis of the detection result of the flowing state detector and the determination result of the prescribed time lapse determination section. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a water treatment system provided with a filtration device that produces suspended water by capturing suspended substances contained in raw water with a filter medium.

Conventionally, there is provided a water treatment system including a filtration device that captures suspended matter (for example, fine particles, organic matter, oxidized precipitates of dissolved iron, etc.) contained in raw water such as groundwater and produces treated water. (For example, see Patent Documents 1 and 2).
The filtration apparatus of such a water treatment system includes filtration means such as a filtration tower. The raw water is supplied to the filtering means through the raw water line. The raw water is usually added with certain chemicals such as a flocculant for flocking fine particles and an oxidizing agent for insolubilizing dissolved iron (suspended material) as a treatment before being supplied to the filtering means. The
The raw water to which the drug has been added is introduced into the filtering means, and suspended substances contained in the raw water are captured and cleaned by the filter medium. And this purified treated water is supplied to a user through a treated water line as clean water or industrial water.

Japanese Patent Laid-Open No. 62-191014 JP 2003-190973 A

By the way, the use aspect of the treated water by a user is various. For example, when treated water is used as industrial water in factories or the like, the use of treated water is stopped for a long time at night or holidays when the factory is not in operation, and the waiting time for water supply in the water treatment system is also long. Become.
Therefore, while the treated water stays in the filtration tower for a long time, the quality of the treated water may be deteriorated depending on the characteristics of the filter medium.

  However, in the water treatment systems described in Patent Documents 1 and 2, the treated water stayed in the filtration tower for a long time when the operation of the factory is resumed (at the start of water supply of the water treatment system) It was configured to supply. Therefore, depending on the user, there is a possibility that the treated water may not satisfy the predetermined management water quality standard.

  An object of this invention is to provide the water treatment system which can suppress the water quality deterioration of treated water even when water supply standby | waiting time is long.

  The present invention includes a raw water line through which raw water circulates, a filtration processing device that is provided at an end portion on the downstream side of the raw water line, captures suspended substances contained in the raw water with a filter medium, and produces treated water, and the filtration A treated water line connected to the treatment device and through which treated water produced by the filtration treatment device flows, and a treated water blower connected to the treated water line and discharging the treated water flowing through the treated water line to the outside of the system A treatment water blow line on / off valve provided in the treatment water blow line for opening and closing the treatment water blow line, and detecting a flow stop state and a flow start state of the treatment water in the filtration device and the treatment water line. A distribution state detecting unit, a distribution stop time measuring unit for measuring a distribution stop time of treated water when the distribution state detecting unit detects that the treated water is in a distribution stop state, A set time elapsed determination unit that determines whether or not the distribution stop time measured by the distribution stop time measurement unit has passed a predetermined set time; a detection result by the distribution state detection unit; and a set time elapsed determination unit. The present invention relates to a water treatment system including a treated water blow line on / off valve control unit that controls opening / closing of the treated water blow line on / off valve based on a determination result.

  The treated water blow line on / off valve control unit detects that the flow of treated water is started by the flow state detection unit, and sets the flow stop time to a first set time by the set time elapse determination unit. When it is determined that the time has elapsed, it is preferable to control the opening / closing of the treated water blow line on / off valve.

  The treated water blow line on / off valve controller controls the opening / closing of the treated water blow line on / off valve every time the set time elapse determining unit determines that the distribution stop time has passed the second set time. It is preferable to do.

  The treated water blow line on / off valve controller controls the opening / closing of the treated water blow line on / off valve every time the set time elapse determining unit determines that the distribution stop time has passed the second set time. And when it is detected that the distribution of the treated water has been started by the distribution state detection unit, and the determination that the distribution stop time has passed the first set time by the set time elapse determination unit, It is preferable to control the opening / closing of the treated water blow line on / off valve.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where water supply waiting time is long, the water treatment system which can suppress the water quality deterioration of treated water can be provided.

It is a lineblock diagram showing water treatment system 1 of a 1st embodiment. It is a functional block diagram concerning control of water treatment system 1 of a 1st embodiment. It is a time chart which shows blow control of the water treatment system 1 of 1st Embodiment. It is a flowchart which shows the blow control of the water treatment system 1 of 1st Embodiment. It is a time chart which shows blow control of the water treatment system 1 of 2nd Embodiment. It is a flowchart which shows the blow control of the water treatment system 1 of 2nd Embodiment. It is a time chart which shows blow control of the water treatment system 1 of 3rd Embodiment. It is a flowchart which shows the blow control of the water treatment system 1 of 3rd Embodiment.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. Drawing 1 is a lineblock diagram showing water treatment system 1 of a 1st embodiment of the present invention. Drawing 2 is a functional block diagram concerning control of water treatment system 1 of a 1st embodiment.

As shown in FIG. 1, the water treatment system 1 according to the first embodiment of the present invention includes a raw water line L1 through which raw water W1 such as groundwater circulates, a raw water pump 2, a raw water valve 3, and a downstream side of the raw water line L1. A filtration device 4 for producing treated water W2 by capturing suspended substances contained in the raw water W1 by a filter medium (not shown), a treated water line L2 through which the treated water W2 flows, A water supply valve 7 that opens and closes the treated water line L2, a treated water tank 8 that is provided at an end on the downstream side of the treated water line L2, and stores the treated water W2, and a treated water W2 in the treated water tank 8 that has a demand point ( A treated water distribution line L3, a treated water distribution pump 9, a backwash water supply line L5, a treated water blow line L8, a backup water supply line Lb, a chemical addition device 11, and a treated water Water quality meter 18 and distribution A flow meter 19 as a state detection unit, is mainly composed with the control unit 30.
In addition, the “line” in this specification is a general term for a line capable of flowing a fluid such as a flow path, a path, and a pipeline.

  The upstream end of the raw water line L1 is connected to a supply source (not shown) of the raw water W1. The downstream end of the raw water line L1 is connected to the filtration device 4 (a control valve 6 described later). The raw water pump 2 is provided in the raw water line L1. The raw water pump 2 sends raw water W1 such as groundwater to the filtration device 4. Operation (drive and stop) of the raw water pump 2 is controlled by a control device 30 (described later). The raw water valve 3 is provided in the raw water line L1, and opens and closes the raw water line L1. Opening and closing of the raw water valve 3 is controlled by a control device 30 (described later).

  The raw water line L1 is configured such that a predetermined drug is added by the drug adding device 11 at the addition point J1. The drug addition device 11 adds a predetermined drug to remove suspended substances in the filtration device 4 (described later) located on the downstream side of the raw water line L1. The drug is a flocculant or an oxidizing agent, and is appropriately selected according to the filtration method of the filtration apparatus 4. Details of the drug will be described later.

The drug addition device 11 includes a drug storage unit 11a and a drug addition pump 11b. The medicine storage unit 11a stores a medicine. The chemical addition pump 11b sends the chemical stored in the chemical reservoir 11a to the raw water W1 and adds it at the addition point J1 of the raw water line L1. The operation (drive and stop) of the medicine addition pump 11b is controlled by a control device 30 (described later).
A backwash water supply line L5 (described later) is joined to the junction J3 of the raw water line L1.

  The filtration device 4 is provided at the downstream end of the raw water line L1, and produces treated water W2 by capturing suspended substances contained in the raw water W1 with a filter medium (not shown). The filtration apparatus 4 includes a filtration tower 5 having a filter medium therein, a control valve 6, and a drain line L4, and is configured so that the filter medium can be periodically washed (reverse washing process and water washing process are performed). ing.

  That is, during the backwashing process, the filtration treatment device 4 is washed water (in this embodiment, treated water W2) through the backwashing water supply line L5 (described later). The suspended substances trapped by the filter medium are discharged out of the system together with the washing water. At the time of the water washing process, the filtration device 4 is supplied with rinsing water (raw water W1 in this embodiment) to the filter medium in order to rinse the back-washed filter medium, and the rinsing water rinsed with the filter medium is discharged out of the system. It is comprised so that.

The filtration tower 5 has a filter medium (not shown) for filtering suspended substances therein.
The control valve 6 controls the flow path of water (raw water W1, treated water W2, backwash water or rinsing water at the time of cleaning the filter medium) flowing into or out of the filter tower 5. The control valve 6 is controlled to be opened and closed by a control device 30 (described later).
The drainage line L4 is connected to the control valve 6 and discharges backwash water (treated water W2) at the time of washing the filter medium, which will be described later, rinse water (raw water W1) at the time of washing the filter medium, and the like.

  The filtration device 4 is configured to be backwashable by the treated water W2 (backwash water) supplied from the treated water tank 8 via the backwash water supply line L5. The backwash water supply line L5 has an upstream end connected to the treated water tank 8, and a downstream end joined the junction J3 of the raw water line L1.

  The backwash water supply line L5 is provided with a backwash water supply pump 15 for sending backwash water and a backwash valve 16 for opening and closing the backwash water supply line L5. The backwash water supply pump 15 is connected to a control device 30 (described later), and the operation (drive and stop) is controlled by the control device 30. The backwash valve 16 is connected to a control device 30 (described later), and its opening and closing is controlled by the control device 30.

  The filtration device 4 is variously selected according to the substance to be removed in the raw water W1. Examples of the filtration processing device 4 include the following sand filtration device, iron removal manganese removal device, and activated carbon filtration device. All of these apparatuses can capture and remove suspended substances contained in the raw water W1 by the sieving effect of the filter medium.

  The sand filtration device captures and removes suspended substances such as fine particles contained in the raw water W1 with a filter medium (not shown). Examples of the sand filtration device include a tower type having a filter medium layer (not shown) formed from a coarse filter medium such as meteorite and a fine filter medium such as anthracite and filter sand. When a sand filtration device is used as the filtration processing device 4, it is necessary to make the suspended substances contained in the raw water W1 coagulate (floc) and easily remove them. Therefore, a flocculant is added by the chemical | medical agent addition apparatus 11 arrange | positioned in the upstream of a filtration tower. As the flocculant, for example, an inorganic flocculant can be used, and specific examples include polyaluminum chloride (PAC) and aluminum sulfate.

  The iron removal manganese removal apparatus captures and removes dissolved iron and dissolved manganese together with suspended substances such as fine particles contained in the raw water W1 with a filter medium (not shown), and a filtration tower packed with the filter medium. It has. Usually, particulate manganese chamotte or manganese zeolite is used for the filter medium. Moreover, when an iron removal manganese removal apparatus is used as the filtration processing apparatus 4, dissolved iron and dissolved manganese contained in the raw water W1 are oxidized and then removed. Therefore, an oxidizing agent (for example, sodium hypochlorite) is added by the chemical | medical agent addition apparatus 11 arrange | positioned in the upstream of a filtration tower.

  Specifically, the dissolved iron contained in the raw water W1 is oxidized by the action of the oxidant, and is converted into ferric hydroxide through insoluble ferrous hydroxide (that is, suspended into a substance). Filtered by the filter medium. When the dissolved manganese contained in the raw water W1 comes into contact with the filter medium by the action of the oxidizing agent, the oxidation proceeds, and is adsorbed and removed by the filter medium.

The activated carbon filter removes impurities such as organic substances, chromaticity components, and odor components together with suspended substances contained in the raw water W1 with a filter medium made of an adsorbent, and includes a filter tower filled with the adsorbent. ing. Usually, particulate or fibrous activated carbon is used as the adsorbent.
The activated carbon filtration device may be used in combination with the sand filtration device and / or the iron removal manganese removal device. In that case, it is preferable to arrange the activated carbon filtration device on the downstream side of the sand filtration device and / or the iron removal manganese removal device. This is because, for example, residual chlorine derived from the oxidizing agent that has passed through the iron removal manganese removal apparatus can be decomposed by the activated carbon filtration apparatus by arranging in this way.

A treated water line L2 is connected to the filtration processing device 4 configured as described above. The upstream end of the treated water line L2 is connected to the filtration device 4 (control valve 6). The downstream end of the treated water line L2 is connected to the treated water tank 8. The treated water W2 produced by the filtration device 4 flows through the treated water line L2.
A water supply valve 7 is provided in the treated water line L2. The water supply valve 7 opens and closes the treated water line L2. The water supply valve 7 is connected to a control device 30 (described later), and the opening and closing of the water supply valve 7 is controlled by the control device 30.

  In addition, a treated water quality meter 18 is connected to the treated water line L2 at a measurement point J5. The treated water quality meter 18 measures the quality (for example, turbidity or chromaticity) of the treated water W2 flowing through the treated water line L2. The treated water quality meter 18 is connected to a control device 30 (described later). The signal measured by the treated water quality meter 18 is input to the control device 30, and the control device 30 determines the quality of the treated water W2.

  Moreover, the flowmeter 19 is connected to the treated water line L2 at the measurement point J6. The flow meter 19 measures the flow rate of the treated water W2 flowing through the treated water line L2, and functions as a flow state detection unit. The flow meter 19 is connected to a control device 30 (described later). The signal measured by the flow meter 19 is input to the control device 30, and the flow rate of the treated water W2 is calculated by the control device 30.

  Moreover, the treated water blow line L8 branches from the branch point J7 of the treated water line L2. This branch point J7 is located on the downstream side of the filtration device 4 and the upstream side of the water supply valve 7 in the treated water line L2.

  The treated water blow line L8 is connected to the branch point J7 of the treated water line L2, and discharges the treated water W2 staying in the filtration tower 5 out of the system. Hereinafter, in the present specification, discharging the treated water W2 out of the system under a predetermined condition is referred to as “performing the blow of the treated water W2” as appropriate.

  The treated water blow line L8 is provided with a treated water blow valve 24 as a treated water blow line opening / closing valve. The treated water blow valve 24 opens and closes the treated water blow line L8. The treated water blow valve 24 is connected to a control device 30 (described later) and is controlled to be opened and closed by the control device 30.

The treated water tank 8 is connected to the downstream end of the treated water line L2 and stores treated water W2 introduced through the treated water line L2.
The treated water tank 8 includes a water level gauge 8a. The water level meter 8a measures the water level of the treated water W2 stored in the treated water tank 8. The water level gauge 8a is connected to a control device 30 (described later). The signal measured by the water level gauge 8a is input to the control device 30. The water level of the treated water tank 8 is calculated by the control device 30.

  In the filtration apparatus 4 of the present embodiment, when the distribution of the treated water W2 is requested, the treated water distribution pump 9 described later is operated, and the treated water W2 in the treated water tank 8 is distributed to a demand point (not shown). The Therefore, the control device 30 detects the decrease in water and the full water in the treated water tank 8 by the water level gauge 8a, so that the water supply start timing and the water supply stop timing of the treated water W2 (that is, the drive and stop of the raw water pump 2) during the filtration process. Timing).

  Further, a backup water supply line Lb is connected to the treated water tank 8. The backup water supply line Lb is treated water or clean water produced by a separate water treatment system or the like when the amount of treated water W2 stored in the treated water tank 8 is insufficient with respect to the demand amount of the treated water W2. Is to supply the treated water tank 8 to the treated water tank 8.

  A backup water supply valve 26 is provided in the backup water supply line Lb. The backup water supply valve 26 opens and closes the backup water supply line Lb. The backup water supply valve 26 is connected to a control device 30 (described later), and the opening and closing of the backup water supply valve 26 is controlled by the control device 30.

  The treated water distribution line L3 is configured such that treated water W2 stored in the treated water tank 8 can be distributed. The upstream end of the treated water distribution line L3 is connected to the treated water tank 8. The downstream end of the treated water distribution line L3 is connected to a demand point (not shown) of the treated water W2. A treated water distribution pump 9 is provided in the treated water distribution line L3. The treated water distribution pump 9 sends treated water W2 from the treated water tank 8 to a downstream demand point. The treated water distribution pump 9 is connected to a control device 30 (described later), and the operation (drive and stop) is controlled by the control device 30.

Next, with reference to FIG. 2, the function which concerns on control of the water treatment system 1 of 1st Embodiment is demonstrated. Drawing 2 is a functional block diagram concerning control of water treatment system 1 of a 1st embodiment.
The control apparatus 30 controls each part in the water treatment system 1 of 1st Embodiment. As shown in FIG. 2, the control device 30 includes, for example, the raw water pump 2, the treated water distribution pump 9, the chemical addition pump 11b, the backwash water supply pump 15, the raw water valve 3, the control valve 6, the water supply valve 7, and the backwash. The valve 16, the backup water supply valve 26, and the treated water blow valve 24 are electrically connected.

  Moreover, the control apparatus 30 is electrically connected to each measurement apparatus in the water treatment system 1, and receives measurement information from each measurement apparatus. The measuring device is, for example, a flow meter 19, a water level meter 8a, and a treated water quality meter 18.

  The control device 30 includes a control unit 31 and a memory unit 45. The control unit 31 includes a distribution stop time measurement unit 32, a set time passage determination unit 33, and a treated water blow valve control unit 34 as a treated water blow line on / off valve control unit.

  The distribution stop time measuring unit 32 performs processing when the flow meter 19 detects that the treated water W2 is in a distribution stopped state (the flow rate of the treated water W2 is zero) in the filtration device 4 and the treated water line L2. It is determined that the water W2 is in a distribution stop state, and the distribution stop time t of the treated water W2 is measured (calculated).

  The “circulation stop time” of the treated water W2 means the “residence time” during which the treated water W2 stays in the filtration tower 5. In other words, the “circulation stop time” of the treated water W2 means a “waiting time” during which the filtration apparatus 4 is waiting for the supply of the treated water W2 without performing the filtration process. This refers to the time from when the flow stop of the treated water W2 is detected to when the flow meter 19 again detects the start of the flow of the treated water W2. Therefore, the “waiting time” includes a time during which the filtration apparatus 4 performs a cleaning process described later.

  The set time passage determination unit 33 determines whether or not the distribution stop time t measured by the distribution stop time measurement unit 32 has passed the first set time t1 (see FIG. 3). The first set time t1 is a threshold value of the residence time, and is a time set to perform the blow simultaneously with the start of the distribution of the treated water W2. The first set time t1 is set in consideration of the upper limit threshold of the residence time during which the treated water W2 can maintain a predetermined water quality. Further, since the residence time (standby time) includes the time of the cleaning process, the first set time t1 is set to be longer than the total time of the cleaning process.

  The treated water blow valve control unit 34 controls opening / closing of the treated water blow valve 24 based on the measurement information (detection result indicating the distribution stop state and the distribution start state) by the flow meter 19 and the determination result by the set time elapsed determination unit 33. To do. A specific control method will be described later.

  The memory unit 45 stores a control program and various data necessary for controlling the water treatment system 1. Specifically, the memory unit 45 includes a control program for operating various functions necessary for controlling the water treatment system 1, various measurement data measured by the measurement devices (for example, flow rate data from the flow meter 19, treated water Water quality data by the water meter 18), various threshold values (for example, the first set time t1), various calculated values (for example, the circulation stop time t of the treated water W2), and the like are stored.

  Next, the basic operation of the water treatment system 1 of the first embodiment will be described with reference to FIG. First, an operation during normal operation in which the treated water W2 is not blown from the treated water blow line L8 will be described. Control related to the blow of the treated water W2 (hereinafter also referred to as “blow control” as appropriate) will be described later.

  In the case of a filtration process during normal operation, the control valve 6 of the filtration apparatus 4 is set as a flow path for the filtration process, and the treated water blow valve 24 of the treated water blow line L8 is closed. When there is a distribution request for the treated water W2, the treated water distribution pump 9 is operated by the control device 30, whereby the treated water W2 stored in the treated water tank 8 is sent to the downstream demand point (distribution start). ). When the water level gauge 8a detects a decrease in the treated water tank 8, the control device 30 activates the raw water pump 2 and the chemical addition pump 11b in the raw water line L1, and opens the raw water valve 3. Further, the control device 30 opens the water supply valve 7 of the treated water line L2. In this case, the backwash water supply pump 15 in the backwash water supply line L5 is not operated, and the backwash valve 16 remains closed.

The raw water W1 is supplied to the raw water line L1 by the raw water pump 2. Then, a predetermined drug is added by the drug adding device 11 at the addition point J1.
The raw water W1 to which the chemical has been added is introduced into the filtration tower 5 through the control valve 6 of the filtration processing device 4. In the filtration tower 5, the raw water W1 is caused to flow so as to descend with respect to the filter medium layer. Thereby, the suspended substance contained in the raw water W1 is captured by the filter medium, and the treated water W2 is produced. The manufactured treated water W2 is circulated to the treated water line L2 via the control valve 6 and stored in the treated water tank 8.

In the treated water line L2, the quality of the treated water W2 is measured by the treated water quality meter 18, and the flow rate of the treated water W2 is measured by the flow meter 19. These pieces of measurement information are received by the control device 30.
When the distribution request for the treated water W2 disappears, the treated water distribution pump 9 is stopped by the control device 30 (distribution stop). Subsequently, when the water level gauge 8a detects that the treated water tank 8 is full, the control device 30 stops the raw water pump 2 and the chemical addition pump 11b in the raw water line L1, and closes the raw water valve 3. . Further, the control device 30 closes the water supply valve 7 of the treated water line L2.

  When the control device 30 determines that the water level of the treated water W2 in the treated water tank 8 has reached a predetermined lower limit value, the control device 30 opens the backup water supply valve 26 of the backup water supply line Lb. The Thereby, the backup water Wb is supplied to the treated water tank 8.

Next, the washing process (back washing process and water washing process) of the filtration apparatus 4 will be described.
At the time of the reverse cleaning process, the control device 30 stops the raw water pump 2 in the raw water line L1, closes the raw water valve 3, and the control valve 6 of the filtration device 4 serves as a flow path for the reverse cleaning process. Is set. Further, the control device 30 closes the water supply valve 7 of the treated water line L2, operates the backwash water supply pump 15 in the backwash water supply line L5, and opens the backwash valve 16. Thereby, in the filtration tower 5, the treated water W2 is flowed so as to rise with respect to the filter medium layer, and the filter medium is developed. The backwash water after washing is discharged out of the system through the drain line L4.

  At the time of the water washing process, the raw water pump 2 in the raw water line L1 is operated by the control device 30, the raw water valve 3 is opened, and the control valve 6 of the filtration apparatus 4 is used as a flow path for the water washing process. Is set. Further, the control device 30 maintains the water supply valve 7 of the treated water line L2 in the closed state, the backwash water supply pump 15 in the backwash water supply line L5 is stopped, and the backwash valve 16 is closed. The Thereby, in the filtration tower 5, the raw water W1 as rinsing water is caused to flow downward with respect to the filter medium layer, and the filter medium is rinsed. The rinsing water after the water washing is discharged out of the system through the drain line L4.

  Next, the blow control of the treated water W2 in the water treatment system 1 of the first embodiment will be described with reference to FIGS. FIG. 3 is a time chart showing blow control of the water treatment system 1 of the first embodiment. FIG. 4 is a flowchart showing blow control of the water treatment system 1 of the first embodiment.

  In the control method of the present embodiment, for example, in a time zone such as a night when operation of a factory or the like is suspended and distribution of the treated water W2 to a demand point is stopped, the treated water W2 is not blown, In the morning, when the treated water W2 is distributed for the first time, the blow is performed.

  In FIG. 3, reference numeral t <b> 1 is a first set time (described later) and indicates a threshold value of the residence time (waiting time) of the treated water W <b> 2. The symbol ta (<t1) indicates the elapsed time of the water treatment system 1 after the first set time t1 has elapsed. A symbol tb indicates a blow time (period) during which the treated water W2 is blown. Reference numerals T1, T2, T3, and T4 indicate time (time). Specifically, T1 indicates the time when the distribution stop state of the treated water W2 is detected. T2 indicates the time when the first set time t1 has elapsed. T3 is the time when the distribution start state of the treated water W2 is detected, and indicates the blow start time. T4 indicates the blow end time.

  That is, FIG. 3 shows, for example, that the treated water W2 is blown in a time zone such as at night (between time T1 and time T3) when the operation of the factory is stopped and the distribution of the treated water W2 is stopped. The time chart in the case of performing blow at the time when the treated water W2 is first distributed in the morning (time T3) is shown.

  Next, the control method of this embodiment will be described in detail. As shown in FIG. 4, in step ST <b> 1, the circulation stop time measuring unit 32 determines whether or not the treated water W <b> 2 is in a circulation stopped state based on the measurement information from the flow meter 19. That is, the distribution stop time measuring unit 32 determines the distribution state (distribution stop state and distribution start state) of the treated water W2.

  If the filtration process is interrupted by stopping the distribution of the treated water W2 or performing the cleaning process and the treated water W2 is in a distribution stopped state (YES) (corresponding to time T1 and thereafter in FIG. 3), the process proceeds to step ST2. When the filtration process is being performed for the distribution of the treated water W2 and the treated water W2 is not in a distribution stopped state (NO) (corresponding to before time T1 in FIG. 3), the treated water W2 is in a distribution stopped state. Wait (repeat step ST1).

  In step ST2, the distribution stop time measuring unit 32 measures the distribution stop time (residence time) t of the treated water W2, and proceeds to step ST3.

In step ST <b> 3, the circulation stop time measuring unit 32 determines whether or not the treated water W <b> 2 is in a distribution start state (whether or not the filtration process has been resumed) based on the measurement information from the flow meter 19.
When the treated water W2 is in a distribution start state (YES) (corresponding to the case at time T3 in FIG. 3), the process proceeds to step ST4. On the other hand, when the treated water W2 is not in the distribution start state (NO) (corresponding to the period from time T2 to time T3 (standby time ta) in FIG. 3), the process returns to step ST2 and the distribution start state of the treated water W2 is The measurement of the distribution stop time t is continued until it is detected.

  In step ST4, the set time elapsed determination unit 33 determines whether or not the distribution stop time t measured by the distribution stop time measuring unit 32 has passed the first set time t1 (see FIG. 3) (t ≧ t1). Determine.

  The first set time t1 is a time during which the treated water W2 cannot maintain a predetermined water quality, and is shorter than a period during which the distribution of the treated water W2 is stopped (between time T1 and time T3). Are set in advance. The first set time t1 is a set value when the treated water W2 staying in the filtration tower 5 is within a reference temperature (for example, 25 ° C.).

  When the distribution stop time t has passed the first set time t1 (YES) (corresponding to time T2 in FIG. 3), the treated water W2 cannot maintain the predetermined water quality, so the filtration process is immediately interrupted, Proceed to step ST5. On the other hand, when the distribution stop time t has not passed the first set time t1 (NO) (corresponding to the period from time T1 to time T2 in FIG. 3), the treated water W2 can maintain a predetermined water quality. Therefore, the filtration process is continued and the process proceeds to step ST6.

  In step ST5, the treated water blow valve control unit 34 opens the treated water blow valve 24 for a certain period of time tb (corresponding to the period from time T3 to time T4 in FIG. 3), and then closes again. Thus, after the treated water W2 is blown, the process returns to the filtration process and proceeds to step ST6.

  When the treated water W2 is blown, the old treated water W2 that has stayed in the filtration tower 5 for the first set time t1 or more is discharged out of the system from the treated water blow line L8, and the discharge amount is reduced. Corresponding new treated water W2 needs to be produced and replenished into the filtration tower 5. That is, it is necessary to replace the old treated water W2 with the new treated water W2.

Therefore, when the treated water W2 is blown, specifically, the following control is performed.
First, the raw water pump 2 is operated, the raw water valve 3 is opened, and the water supply valve 7 is closed. At the same time, the drug is added by the drug adding device 11. Further, the treated water blow valve 24 is opened, and the old treated water W2 is discharged out of the system through the treated water blow line L8 while performing the filtration process by the filtration treatment device 4.

  The blow time tb is set in advance so that the old treated water W2 staying in the filtration tower 5 is completely discharged out of the system from the treated water blow line L8. As a result, the old treated water W2 staying in the filtration tower 5 for a predetermined time can be sufficiently replaced with the new treated water W2, and the treated water W2 that may have deteriorated water quality is not supplied. be able to.

  In step ST6, the distribution stop time measuring unit 32 resets the measured distribution stop time t and ends the control.

According to the water treatment system 1 of 1st Embodiment demonstrated above, each effect shown below is show | played.
In the water treatment system 1 of the first embodiment, the raw water line L1, the filtration device 4, the treated water line L2, the treated water blow line L8, the treated water blow valve 24, the flow meter 19, and the treated water. When it is detected that W2 is in a distribution stop state, the distribution stop time measuring unit 32 that measures the distribution stop time t of the treated water W2 and whether the distribution stop time t has passed a predetermined set time are determined. And a treated water blow valve control unit 34 for controlling the opening and closing of the treated water blow valve 24 based on the detection result by the flow meter 19 and the determination result by the set time elapsed determination unit 33.

  Therefore, the old treated water W2 staying in the filtration tower 5 can be discharged out of the system from the treated water blow line L8, and the treated water W2 that may have deteriorated water quality is not supplied. it can. Therefore, even if the water supply standby time is long, deterioration of the water quality of the treated water W2 can be suppressed.

  Further, in the water treatment system 1 of the first embodiment, the treated water blow valve control unit 34 detects that the flow of the treated water W2 is started by the flow meter 19 and stops the flow by the set time elapsed determination unit 33. When it is determined that the time t has passed the first set time t1, the open / close control of the treated water blow valve 24 is configured.

Therefore, by setting the first set time t1 shorter in advance than the period during which the distribution of the treated water W2 is stopped (known period), the time zone such as the night when the distribution of the treated water W2 is stopped In FIG. 5, the blow of the treated water W2 is not performed, and the blow can be performed only when the treated water W2 is first distributed in the morning (when the filtration process is resumed).
Accordingly, the number of times the treated water W2 is blown can be minimized (once), and water resources can be saved and water production costs can be reduced.

  Next, another embodiment of the present invention will be described. The other embodiments will be described mainly with respect to points different from the control method of the first embodiment. The same reference numerals are given to the same configurations as those of the first embodiment, and detailed descriptions thereof will be omitted. For the points not specifically described in other embodiments, the description of the first embodiment is appropriately applied or incorporated.

[Second Embodiment]
Next, a control method of the water treatment system 1 according to the second embodiment of the present invention will be described with reference to FIGS. 5 and 6. FIG. 5 is a time chart showing blow control of the water treatment system 1 of the second embodiment. FIG. 6 is a flowchart showing blow control of the water treatment system 1 of the second embodiment.
The basic configuration of the water treatment system 1 of the second embodiment is the same as the basic configuration of the water treatment system 1 of the first embodiment. The second embodiment is different from the first embodiment in the configuration related to the control.

  In the present embodiment, for example, the treatment water W2 is blown regularly (for example, every four hours) in a time zone such as a night when the operation of the factory is stopped and the distribution of the treatment water W2 is stopped. It is what I did.

  In FIG. 5, a symbol t2 indicates a second set time t2 (described later). Symbol tc (<t2) indicates the standby time of the water treatment system 1 after the second blow is completed (the residence time of the treated water W2). Symbols T5, T6, T7, T8, and T9 indicate time (time). Specifically, T5 is the time when the second set time t2 has elapsed, and indicates the first blow execution start time. T6 indicates the execution end time of the first blow. T7 is the time when the second set time t2 has elapsed after the completion of the first blow, and indicates the second blow start time. T8 indicates the execution end time of the second blow. T9 is the distribution request time of the treated water W2, and indicates the time when the distribution start state of the treated water W2 is detected.

  That is, FIG. 5 shows, for example, the second set time t2 (for example, in the time zone (between the time T1 and the time T9) such as the night when the operation of the factory is stopped and the distribution of the treated water W2 is stopped. 4 shows a time chart when the treated water W2 is blown every time 4 hours).

  Next, the control method of this embodiment will be described in detail. As shown in FIG. 6, in step ST <b> 11, the circulation stop time measuring unit 32 determines whether or not the treated water W <b> 2 is in a circulation stopped state based on the measurement information from the flow meter 19.

  If the filtration process is interrupted by stopping the distribution of the treated water W2 or performing the washing process and the treated water W2 is in a distribution stopped state (YES) (corresponding to time T1 and thereafter in FIG. 5), the process proceeds to step ST12. When the filtration process is being performed for the distribution of the treated water W2 and the treated water W2 is not in a distribution stopped state (NO) (corresponding to before time T1 in FIG. 5), the treated water W2 is in a distribution stopped state. Wait (repeat step ST11).

  In step ST12, the distribution stop time measuring unit 32 measures the distribution stop time (residence time) t of the treated water W2, and proceeds to step ST13.

  In step ST13, the set time elapsed determination unit 33 determines whether or not the distribution stop time t measured by the distribution stop time measurement unit 32 has passed the second set time t2 (see FIG. 5) (t ≧ t2). Determine.

  The second set time t2 is a time during which the treated water W2 can no longer maintain a predetermined water quality, and is a period of time such as nighttime when the distribution of the treated water W2 is stopped (a period from time T1 to time T9). For example, 10 hours). That is, the second set time t2 is set so that the blow of the blow time tb can be performed at least once (for example, 4 hours). In the present embodiment, the second set time t2 is set so that two blows can be performed. The second set time t2 is a set value when the treated water W2 staying in the filtration tower 5 is within a reference temperature (for example, 25 ° C.).

  In step ST13, when the distribution stop time t has not passed the second set time t2 (NO) (corresponding to the period from time T1 to time T5 in FIG. 5), the process returns to step ST12 and the distribution stop time. Wait until t passes the second set time t2 (repeat step ST12).

  In step ST13, when the distribution stop time t has passed the second set time t2 (YES) (corresponding to time T5 in FIG. 5), the process proceeds to step ST14 and the first blow of the treated water W2 is performed. To do.

  Specifically, in step ST14, the treated water blow valve control unit 34 opens the treated water blow valve 24 for a certain blow time tb (corresponding to the period from time T5 to time T6 in FIG. 5), By closing again, the 1st blow of the treated water W2 is implemented, and it progresses to step ST15.

  In step ST15, the distribution stop time measuring unit 32 resets the measured distribution stop time t, and proceeds to step ST16.

In step ST <b> 16, the circulation stop time measuring unit 32 determines whether or not the treated water W <b> 2 is in a distribution start state (whether or not the filtration process has been resumed) based on the measurement information from the flow meter 19.
When the treated water W2 is in the distribution start state (YES) (corresponding to the case at time T9 in FIG. 5), the control is terminated.

  In step ST16, when the treated water W2 is in a distribution stop state (NO) (corresponding to the period from time T6 to time T7 in FIG. 5), the process returns to step ST12 and the second blow of the treated water W2 is performed. Prepare for.

  As described above, when the distribution stop time t has passed the second set time t2 (YES) (corresponding to time T7 in FIG. 5) in step ST13, the process proceeds to step ST14, and the treated water W2 The second blow is performed. Thereafter, the control is performed in the same manner as described above. When it is determined in step ST16 that the treated water W2 is in a distribution start state (YES) (corresponding to the time T9 in FIG. 5), the control is performed. finish.

According to the water treatment system 1 of 2nd Embodiment demonstrated above, while having the same effect as the control method of the water treatment system 1 of the said 1st Embodiment, each effect shown below is show | played.
In the water treatment system 1 of the second embodiment, the treated water blow valve control unit 34, every time when the set time elapsed determination unit 33 determines that the circulation stop time t has passed the second set time t2, The treatment water blow valve 24 is configured to be opened and closed.

  Therefore, according to the water treatment system 1 of the second embodiment, for example, the passage of the second set time t2 in a time zone such as at night when the operation of a factory or the like is suspended and the distribution of the treated water W2 is stopped. Every time, the treated water W2 can be blown periodically.

[Third Embodiment]
Next, a control method of the water treatment system 1 according to the third embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a time chart showing blow control of the water treatment system 1 of the third embodiment. FIG. 8 is a flowchart showing blow control of the water treatment system 1 of the third embodiment.

  In the present embodiment, for example, on a holiday (for example, Saturday and Sunday) in which the operation of a factory or the like is suspended and the distribution of the treated water W2 is stopped, the treated water W2 is periodically (eg every 24 hours). In addition to performing the blow, the blow is performed when the treated water W2 is first distributed in the morning after the holiday.

  In FIG. 7, a symbol t1 (<t2) indicates a first set time (described later), and a symbol t2 indicates a second set time (described later). Moreover, the code | symbol td (t1 <td <t2) shows the standby | waiting time (the residence time of the treated water W2) of the water treatment system 1 after completion | finish of implementation of the 2nd blow.

  Reference signs T10 to T16 indicate time (time). Specifically, T10 is the time when the second set time t2 has elapsed, and indicates the first blow execution start time. T11 indicates the execution end time of the first blow. T12 is the time when the second set time t2 has elapsed, and indicates the start time of the second blow. T13 indicates the end time of the second blow. T14 is the time when the first set time t1 has elapsed after the completion of the second blow. T15 is the distribution request time of the treated water W2, indicates the time when the distribution start state of the treated water W2 is detected, and indicates the start time of the third blow. T16 indicates the execution end time of the third blow.

  That is, FIG. 7 shows the second set time on a holiday (for example, between time T1 and time T15 on Saturdays and Sundays) when the operation of the factory or the like is suspended and the distribution of the treated water W2 is stopped. When the treatment water W2 is blown periodically every t2 (for example, 24 hours), and when the treatment water W2 is first distributed (time T15) in the morning after the holiday The time chart is shown.

  Here, as in the case of the first embodiment, the first set time t1 is a threshold value of the residence time t, and is a time set so as to perform the blow simultaneously with the start of the distribution of the treated water W2. It is. The first set time t1 is a set value when the treated water W2 staying in the filtration tower 5 is within a reference temperature (for example, 25 ° C.). In the present embodiment, the first set time t1 can be set as 4 hours, for example.

  In addition, the second set time t2 is set in advance as a time shorter than, for example, a holiday period in which the distribution of the treated water W2 is stopped (for example, between time T1 and time T15 on Saturday and Sunday). It is. In the present embodiment, the second set time t2 is set so that two blows can be performed. The second set time t2 is a set value when the treated water W2 staying in the filtration tower 5 is within a reference temperature (for example, 25 ° C.). The second set time t2 can be set as 24 hours, for example.

  Next, the control method of this embodiment will be described in detail. As shown in FIG. 8, in step ST <b> 21, the circulation stop time measuring unit 32 determines whether or not the treated water W <b> 2 is in a circulation stopped state based on the measurement information from the flow meter 19.

  If the filtration process is interrupted by stopping the distribution of the treated water W2 or performing the cleaning process and the treated water W2 is in a circulation stopped state (YES) (corresponding to time T1 and thereafter in FIG. 8), the process proceeds to step ST22. On the other hand, when the filtering process is being performed for the distribution of the treated water W2 and the treated water W2 is not in the distribution stopped state (NO) (corresponding to before time T1 in FIG. 7), the treated water W2 is in the distribution stopped state. (Step ST21 is repeated).

  In step ST22, the distribution stop time measuring unit 32 measures the distribution stop time (residence time) t of the treated water W2, and proceeds to step ST23.

In step ST23, the distribution stop time measuring unit 32 determines whether or not the treated water W2 is in a distribution start state (whether or not the filtration process has been resumed) based on the measurement information from the flow meter 19.
When the treated water W2 is not in the distribution start state (NO) (corresponding to the period from time T1 to time T10 in FIG. 7), the process proceeds to step ST27.

  In step ST27, the set time elapsed determination unit 33 determines whether or not the distribution stop time t measured by the distribution stop time measurement unit 32 has passed the second set time t2 (see FIG. 7) (t ≧ t2). Determine.

  In step ST27, when the distribution stop time t has not passed the second set time t2 (NO) (in FIG. 7, before the first blow, it corresponds to the period from time T1 to time T10), It returns to step ST22 and waits until the distribution stop time t passes the second set time t2 (the control from step ST22 to step ST23 is repeated).

  In step ST27, when the distribution stop time t has passed the second set time t2 (YES) (corresponding to time T10 in FIG. 7), the process proceeds to step ST28, and the first blow of the treated water W2 is performed. To do.

  Specifically, in step ST28, the treated water blow valve control unit 34 opens the treated water blow valve 24 for a certain blow time tb (corresponding to a period from time T10 to time T11 in FIG. 7). By closing again, the 1st blow of the treated water W2 is implemented, and it progresses to step ST29.

  In step ST29, the distribution stop time measuring unit 32 resets the measured distribution stop time t and returns to step ST22. After step ST22, the second blow is performed in the same manner as the first blow until it is determined in step ST23 that the treated water W2 is in a distribution start state.

In the above-described step ST23, when the treated water W2 is in a distribution start state (YES) (corresponding to time T15 when the second blow is performed and the standby time td has elapsed in FIG. 7), the process proceeds to step ST24. .
In the setting example of the first set time t1 and the second set time t2 in the present embodiment, as shown in FIG. 7, after the second blow is performed, the process proceeds to step ST24.

  In step ST24, the set time elapsed determination unit 33 determines whether or not the distribution stop time t measured by the distribution stop time measuring unit 32 has passed the first set time t1 (see FIG. 7) (t ≧ t1). Determine.

  When the distribution stop time t has passed the first set time t1 (YES) (corresponding to time T14 in FIG. 7), the treated water W2 cannot maintain the predetermined water quality, so the filtration process is immediately interrupted, Proceed to step ST25. On the other hand, when the distribution stop time t has not passed the first set time t1 (NO) (corresponding to the period from time T13 to time T14 in FIG. 7), the treated water W2 can maintain the predetermined water quality. Therefore, the filtration process is continued and the process proceeds to step ST26.

  In step ST25, the treated water blow valve control unit 34 sets the treated water blow valve 24 to a certain blow time tb (corresponding to a period from time T15 to time T16 after the second blow is performed in FIG. 7). After the valve is opened, the valve is closed again to return to the filtration process after the third blow of the treated water W2 is performed. In step ST26, the measured distribution stop time t is reset, and then the control is terminated.

According to the water treatment system 1 of 3rd Embodiment demonstrated above, while having the same effect as the water treatment system 1 of the said 1st Embodiment, each effect shown below is show | played.
In the water treatment system 1 of the third embodiment, each time the treated water blow valve control unit 34 determines that the set suspension time t has passed the second set time t2 by the set time elapsed determination unit 33, The open / close control of the treated water blow valve 24 is performed, the flow state detection unit detects that the flow of the treated water W2 has started, and the set time elapsed determination unit 33 sets the flow stop time t to the first set time t1. And a treated water blow valve control unit 34 that controls the opening and closing of the treated water blow valve 24 when it is determined that the time has elapsed.

  Therefore, by combining the first set time t1 and the second set time t2, the timing at which the treated water W2 is blown can be freely selected. Therefore, it is possible to provide high-quality treated water W2 even for users who have strict water quality management.

As mentioned above, although one Embodiment of this invention was described, this invention is not restrict | limited to embodiment mentioned above, It can change suitably.
For example, in the above embodiment, the first set time t1 and the second set time t2 are exemplified, but the present invention is not limited to this. The magnitude relationship between the first set time t1 and the second set time t2 is also arbitrary.

  In the above embodiment, the first set time t1 and the second set time t2 have been described as set values when the treated water W2 is within a reference temperature (for example, 25 ° C.). Is not limited to. The first set time t1 and / or the second set time t2 may be set by multiplying a predetermined coefficient according to the temperature of the treated water W2.

DESCRIPTION OF SYMBOLS 1 Water treatment system 4 Filtration processing apparatus 8a Water level meter 19 Flowmeter (circulation state detection part)
24 treated water blow valve 30 control device 32 distribution stop time measuring unit 33 set time elapsed judging unit 34 treated water blow valve control unit (treated water blow line on / off valve control unit)
L1 Raw water line L2 Treated water line L8 Treated water blow line W1 Raw water W2 Treated water

Claims (4)

Raw water line through which raw water circulates,
A filtration device that is provided at the downstream end of the raw water line and that captures suspended substances contained in the raw water with a filter medium to produce treated water;
A treated water line connected to the filtration treatment apparatus and through which treated water produced by the filtration treatment apparatus flows;
A treated water blow line connected to the treated water line and discharging treated water flowing through the treated water line out of the system;
A treated water blow line on-off valve provided in the treated water blow line for opening and closing the treated water blow line;
A flow state detecting unit for detecting a flow stop state and a flow start state of treated water in the filtration device and the treated water line;
A distribution stop time measuring unit that measures the distribution stop time of treated water when the distribution state detection unit detects that the treated water is in a distribution stop state;
A set time elapsed determination unit that determines whether or not the distribution stop time measured by the distribution stop time measuring unit has passed a predetermined set time;
A treated water blow line on / off valve control unit that controls opening / closing of the treated water blow line on / off valve based on a detection result by the flow state detection unit and a determination result by the set time elapsed determination unit;
A water treatment system comprising.   The treated water blow line on / off valve control unit is detected by the flow state detecting unit to start the flow of treated water, and the set time elapsed determining unit has passed the first set time. The water treatment system of Claim 1 which controls opening / closing of the said treated water blow line on-off valve, when it determines with.   The treated water blow line on / off valve controller controls opening / closing of the treated water blow line on / off valve every time the set time elapse determining unit determines that the circulation stop time has passed a second set time. Item 2. A water treatment system according to item 1. The treated water blow line on / off valve controller controls opening / closing of the treated water blow line on / off valve every time the set time elapse determining unit determines that the circulation stop time has passed the second set time. ,
When the distribution state detection unit detects that the distribution of treated water has started, and the set time elapse determination unit determines that the distribution stop time has passed the first set time, the treated water blow The water treatment system of Claim 1 which controls opening and closing of a line on-off valve.

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