WO2017006823A1 - Dispositif d'assistance à l'injection de floculant et système d'assistance à l'injection de floculant - Google Patents

Dispositif d'assistance à l'injection de floculant et système d'assistance à l'injection de floculant Download PDF

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Publication number
WO2017006823A1
WO2017006823A1 PCT/JP2016/069269 JP2016069269W WO2017006823A1 WO 2017006823 A1 WO2017006823 A1 WO 2017006823A1 JP 2016069269 W JP2016069269 W JP 2016069269W WO 2017006823 A1 WO2017006823 A1 WO 2017006823A1
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Prior art keywords
water
flocculant
injection
current value
value
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PCT/JP2016/069269
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English (en)
Japanese (ja)
Inventor
美意 早見
清一 村山
法光 阿部
卓 毛受
太 黒川
服部　大
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株式会社東芝
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Publication of WO2017006823A1 publication Critical patent/WO2017006823A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/30—Control equipment

Definitions

  • Embodiments of the present invention relate to a flocculant injection support device and a flocculant injection support system.
  • flocculant is injected into the water storage part in the water purification process.
  • the injection amount or injection rate of the flocculant is determined based on the flow current value of the raw water.
  • the flowing current value needs to be corrected according to a parameter relating to water quality (hereinafter referred to as “water quality parameter”).
  • the water quality parameters are, for example, pH (logarithm of hydrogen ion concentration), conductivity, and water temperature.
  • the problem to be solved by the present invention is to provide a flocculant injection support device and a flocculant injection support system that can support the determination of the injection amount or injection rate of the flocculant even when the water quality parameter changes. is there.
  • the flocculant injection support device of the embodiment has a correction unit and a control unit.
  • the correction unit is the water quality parameter of the water collected from the water collected from the water reservoir into which the flocculant is injected, or the water flowing current value collected from the upstream side of the water flow with respect to the water reservoir. Correct based on The control unit determines a candidate for the injection amount or injection rate of the flocculant based on the corrected flow current value.
  • the figure which shows the example of a relationship between electrical conductivity and flowing current value in embodiment The figure which shows the example of a relationship between the electrical conductivity represented by the logarithm, and the corrected flowing current value in embodiment.
  • FIG. 1 is a diagram illustrating a configuration example of a water treatment system 1 including an injection support device (coagulant injection support device).
  • the water treatment system 1 is referred to as a “water treatment system 1a”.
  • the water treatment system 1a is not limited to a specific facility as long as the facility includes a device (solid-liquid separation device) that performs treatment using a flocculant on water.
  • the water treatment system 1a is, for example, a water purification plant, a paper factory, or a food factory.
  • the water treatment system 1a is a water purification plant as an example.
  • the water treatment system 1a includes a intake well 10, a landing well 20, a contact pond 30, a mixing basin 40, a flock formation basin 50, a sedimentation basin 60, a sand filtration ridge 70, a water distribution basin 80, and an adjustment unit. 90, a flocculant 100, and an injection support system 200 (coagulant injection support system).
  • the intake well 10 is located most upstream with respect to the flow of water.
  • the distribution reservoir 80 is located most downstream with respect to the flow of water.
  • the intake well 10 temporarily stores raw water.
  • the raw water from the intake well 10 is sent to the landing well 20.
  • plants and earth and sand are settled and separated from the raw water.
  • the supernatant water of the landing well 20 is sent to the contact pond 30.
  • the water sent from the landing well 20 and the adsorbent are mixed.
  • the adsorbent is, for example, activated carbon.
  • the adsorbent adsorbs the chromaticity component and the soluble component contained in the supernatant water of the landing well 20.
  • the soluble component is, for example, a soluble organic substance.
  • the contact pond 30 is provided with a conductivity meter 31 and a water temperature meter 32.
  • the conductivity meter 31 measures the conductivity of the supernatant water of the contact pond 30.
  • the conductivity meter 31 transmits information representing the measurement result of the conductivity to the injection support system 200.
  • the water thermometer 32 measures the temperature of the supernatant water of the contact pond 30.
  • the water temperature gauge 32 transmits information representing the measurement result of the water temperature to the injection support system 200.
  • the contact basin 30 includes a flow meter 33 in a pipe that leads to the mixing basin 40.
  • the flow meter 33 measures the flow rate of water sent to the mixing basin 40 at a predetermined time.
  • the flow meter 33 transmits information representing the flow measurement result to the injection support system 200.
  • the water temperature meter 32 may measure the temperature of the water measured by the conductivity meter 31.
  • the water temperature meter 32 may measure the temperature of the water whose flow rate is measured by the flow meter 33.
  • the conductivity meter 31 may be installed in the mixing basin 40.
  • the supernatant water of the contact basin 30 is sent to the mixing basin 40 (rapid stirring basin).
  • the coagulant 100 is poured into water by the adjusting unit 90.
  • the flocculant 100 may be poured into water manually by an operator of the water treatment system 1a.
  • the mixing basin 40 is provided with a mixing device 41 and a pH meter 42.
  • the mixing device 41 mixes the water sent from the contact pond 30 and the flocculant 100.
  • the mixing device 41 uses, for example, a rapid stirring device (flash mixer), a stirring device having a driving unit such as a motor, a stirring device without a driving unit (static mixer), or a circulating flow generated by a submersible pump. It is a stirring device.
  • the charged state of the suspended matter (Suspended Solids) is neutralized by the flocculant 100. Due to the neutralization of the charged state, the suspended material aggregates. Suspended substances are, for example, earth and sand having a fine particle size, chromaticity components, soluble components, and algae.
  • fine flocs are formed in the water by the stirring by the mixing device 41.
  • the pH meter 42 measures the pH value of water (logarithm of hydrogen ion concentration) immediately after the flocculant 100 is mixed. In the first embodiment, the pH meter 42 measures the pH value of the water in the mixing basin 40. The pH meter 42 transmits information representing the measurement result of the pH value to the injection support system 200. A pH adjusting agent may be injected into the contact basin 30 or the mixing basin 40.
  • Water containing fine flocs is sent from the mixing basin 40 to the floc formation pond 50.
  • the flock formation pond 50 causes fine flocks contained in water to collide with each other to grow flocks.
  • the sedimentation basin 60 sediments flocs grown in water.
  • the sedimentation basin 60 includes a turbidimeter 61 on a pipe that leads to the sand filtration building 70.
  • the turbidimeter 61 measures the turbidity of the supernatant water sent from the sedimentation basin 60.
  • the turbidimeter 61 transmits the measurement result of turbidity to the injection support system 200.
  • the water from the sedimentation basin 60 is sent to the sand filtration building 70.
  • the sand filtration building 70 filters the water sent from the settling basin 60.
  • the sand filtration building 70 has a column shape.
  • the sand filtration building 70 may be a water tank having an opening.
  • the pipe for supplying water may be packed with an adsorbent.
  • the sand filtration building 70 may be a rectangular sand filtration pond.
  • the filtered water is sent from the sand filtration building 70 to the distribution reservoir 80.
  • chlorine is injected into the water.
  • Water disinfected with chlorine is distributed from the distribution reservoir 80.
  • the distributed water is supplied to houses.
  • the adjustment unit 90 is a mechanism that can adjust the injection amount or injection rate of the flocculant 100. Any mechanism that can adjust the injection amount or injection rate of the flocculant 100 may be used.
  • the adjustment unit 90 is, for example, a pump.
  • the adjustment unit 90 injects the injection amount of the flocculant 100 determined by the injection support system 200 including an information processing apparatus or the like into the mixing basin 40.
  • the adjustment unit 90 may inject the flocculant 100 having the injection amount or injection rate determined by the injection support system 200 into the mixing basin 40.
  • the injection amount of the flocculant 100 is adjusted, for example, in units of liters.
  • the injection rate of the flocculant 100 is expressed by the injection amount of the flocculant 100 per unit time and the flow rate measured by the flow meter 33. For example, the unit of the injection rate of the flocculant 100 is “liter / hour”.
  • the adjustment unit 90 may change the injection amount or injection rate of the flocculant 100 using an inverter or a solenoi
  • the flocculant 100 is a drug charged to a positive charge. In addition, suspended substances and bubbles of water are charged with a negative charge.
  • the flocculant 100 injected into the water agglomerates particles such as suspended substances contained in the water by neutralizing the charged state of the suspended substances in the water.
  • the flocculant 100 is, for example, an inorganic flocculant such as polyaluminum chloride (PAC: Poly-Aluminum Chloride), sulfuric acid band, ferric chloride, ferrous sulfate, polysilica iron.
  • the flocculant 100 may be used in combination with a polymer flocculant.
  • the polymer flocculant is, for example, a cationic polymer, an anionic polymer, or an amphoteric polymer.
  • the flocculant 100 may be used in combination with a pH adjuster.
  • the pH adjuster can adjust the pH value of water until it is in a pH range that is suitable for aggregation.
  • the pH adjusting agent may be an acidic adjusting agent or an alkaline adjusting agent.
  • the acidic regulator is, for example, sulfuric acid or hydrochloric acid.
  • Examples of the alkaline adjusting agent are caustic soda and calcium hydroxide.
  • the injection support system 200 includes a flow ammeter 210 (SCD: Streaming Current Detector), a pH correction unit 220, a conductivity correction unit 230, a water temperature correction unit 240, an injection support device 250, and a presentation device 260. .
  • SCD Streaming Current Detector
  • FIG. 2 is a diagram illustrating a configuration example of the flow ammeter 210.
  • the flowing ammeter 210 is a measuring device having a sensor for measuring the flowing current value (SC value) of water.
  • the measuring device may include other sensors that measure other than the flowing current value.
  • the flow ammeter 210 includes a probe 211, a piston 212, and an electrode 213.
  • Water in the mixing basin 40 is sent to the flow ammeter 210 by a water supply mechanism such as a pump or a water level difference.
  • the water sent to the flow ammeter 210 may be returned to the mixing basin 40. Thereby, the flow ammeter 210 can enhance the mixing action in the mixing basin 40.
  • the interval between the probe 211 and the piston 212 is, for example, 0.1 mm.
  • the piston 212 reciprocates in a space surrounded by the probe 211.
  • the electrode 213-1 measures the flowing current of the water poured into the probe 211, and outputs a signal corresponding to the measured flowing current.
  • the flowing current of water is generated by the movement of the charged suspended matter that occurs as the piston 212 moves up and down.
  • Flowing ammeter 210 outputs a flowing current value indicating a signal corresponding to the measured flowing current to injection support apparatus 250. The same applies to the electrode 213-2.
  • the flow ammeter 210 is, for example, a flow electrometer that continuously detects the charged state of the suspended matter.
  • the flow ammeter 210 may be a zeta electrometer that intermittently detects the charge state of the suspended matter.
  • the flowing current value increases or decreases according to the injection amount or injection rate of the flocculant 100.
  • the flow ammeter 210 continuously measures the flow current value of the water immediately after the flocculant 100 and the raw water are stirred and mixed. In the following, the flow ammeter 210 continuously measures the flow current value of the water in the mixing basin 40 and transmits it to the injection support device 250 based on a preset time period.
  • the flow ammeter 210 may continuously measure the flow current value of the water at the outlet of the mixing basin 40 and the inlet of the flock formation basin 50.
  • the flow ammeter 210 may transmit the flow current value of the water at the outlet of the mixing basin 40 or the inlet of the flock formation pond 50 to the injection support device 250 based on a preset time period.
  • the flowing current value is easily affected by the water quality parameter, it is corrected based on the water quality parameter.
  • the flowing current value is corrected by the pH correction unit 220 based on the measurement result of pH.
  • the flowing current value is corrected by the water temperature correction unit 240 based on the conductivity measurement result.
  • the flowing current value is corrected by the water temperature correction unit 240 based on the measurement result of the water temperature.
  • FIG. 3 is a diagram showing an example of the relationship between the flowing current value and turbidity.
  • the horizontal axis represents the flowing current value.
  • the flowing current value changes according to the injection amount of the flocculant 100.
  • the left vertical axis represents turbidity (NTU: Nephelometric Turbidity Unit).
  • the unit of turbidity is not limited to NTU, but may be “degree” or “mg / L”.
  • the right vertical axis represents the suction filtration time ratio (STR: Suction Time Ratio).
  • An example of the relationship between the flowing current value and the turbidity is stored in the storage unit 253 in the form of table data, for example.
  • the flowing current value increases.
  • the turbidity of water measured by the turbidimeter 61 decreases.
  • the control value (reference value) and the suction filtration time ratio is the lowest, the load on the downstream sand filtration building 70 is reduced with respect to the flow of water. In this case, the water becomes the clearest overall. In FIG. 3, the water is clearest when the turbidity is lowest.
  • the target value of the injection amount (injection rate) of the flocculant 100 is the injection amount (injection rate) at which water is clarified.
  • the control unit 252 acquires the measurement result of the turbidity measured by the turbidimeter 61 from the interface 251.
  • the control unit 252 determines the injection amount or injection rate candidate of the flocculant 100 based on the measurement result of turbidity so that the flowing current value becomes the target value.
  • the controller 252 injects the flocculant 100 until the turbidity measurement result reaches the turbidity threshold.
  • the turbidity threshold is a turbidity determined in advance based on the result of the water quality test so that the water becomes the clearest.
  • the control unit 252 may increase the target value of the flowing current value when the measurement result of the turbidity measured by the turbidimeter 61 exceeds the turbidity threshold.
  • the control unit 252 may acquire the measurement result of the suction filtration time ratio from the interface 251.
  • the controller 252 determines a candidate for the injection amount or injection rate of the flocculant 100 based on the measurement result of the suction filtration time ratio so that the flowing current value becomes the target value. Candidates for the injection amount or injection rate of the flocculant 100 are presented to the presentation device 260.
  • the control unit 252 acquires, from the interface 251, the injection amount or injection rate selected by the operator of the water treatment system 1 a among the injection amount or injection rate candidates of the flocculant 100.
  • the control unit 252 transmits the injection amount or injection rate selected by the operator of the water treatment system 1a to the adjustment unit 90.
  • the controller 252 causes the adjusting unit 90 to inject the flocculant 100 having the injection amount or injection rate selected by the operator.
  • the control unit 252 injects the flocculant 100 having the injection amount or injection rate selected by the operator until the measurement result of the suction filtration time ratio reaches the STR threshold value.
  • the STR threshold is a suction filtration time ratio determined in advance based on the result of the water quality test so that the water becomes the clearest.
  • the flowing current value is easily affected by water quality parameters. For this reason, the measured flowing current value is converted into the flowing current value in the standard state based on the water quality parameter. That is, the measured flowing current value is corrected based on the water quality parameter. Candidates for the injection amount or injection rate of the flocculant 100 are determined based on the corrected flow current value.
  • the standard state is, for example, a state where water is 25 degrees Celsius, pH 7.0, and conductivity 10 mS / m.
  • the standard state may be defined by an operator of the water treatment system 1a.
  • the operator of the water treatment system 1a may define the standard state based on the annual average value or the monthly average value of the raw water quality of the water treatment system 1a that is actually operated.
  • the pH correction unit 220 acquires the measurement result of the pH value from the pH meter 42.
  • the pH correction unit 220 corrects the flowing current value measured by the flowing ammeter 210 based on the measurement result of the pH value.
  • FIG. 4 is a diagram showing an example of the relationship between pH and flowing current value.
  • the horizontal axis indicates pH.
  • the vertical axis represents the flowing current value.
  • An example of the relationship between pH and flowing current value is stored in the storage unit 253 in the form of table data, for example.
  • the a streaming current and pH a linear relationship monotonically decreasing slope of K pH.
  • the control unit 252 determines a correction value (hereinafter referred to as “pH correction value”) based on the measurement result of the pH value.
  • the flowing current value is corrected based on the pH correction value.
  • the control unit 252 determines the pH correction value based on the formula (1) indicating the relationship between the pH and the flowing current value.
  • ⁇ Z pH indicates a pH correction value.
  • pH indicates the measurement result of the pH value.
  • pH m indicates a pH value in a standard state.
  • Operator of the water treatment system 1a defines the value of K pH by quality test. The operator of the water treatment system 1a may determine the value of the change amount KpH of the flowing current value based on the operation results of the water treatment system 1a.
  • the pH correction unit 220 adds the pH correction value ⁇ Z pH to the flowing current value measured by the flowing ammeter 210.
  • the conductivity correction unit 230 acquires the conductivity measurement result from the conductivity meter 31.
  • the conductivity correcting unit 230 corrects the flowing current value measured by the flowing ammeter 210 based on the measurement result of the conductivity.
  • FIG. 5 is a diagram showing an example of the relationship between conductivity and flowing current value.
  • the horizontal axis indicates the conductivity.
  • the vertical axis represents the flowing current value.
  • the flowing current value approaches the value 0 nonlinearly as the conductivity increases. That is, the absolute value of the flowing current value is smaller as the conductivity increases. Therefore, the sensitivity of the flow ammeter 210 is higher as the conductivity is smaller.
  • FIG. 6 is a diagram showing an example of the relationship between the electrical conductivity expressed in logarithm and the flowing current value.
  • the horizontal axis shows the conductivity expressed by logarithm.
  • the vertical axis represents the flowing current value.
  • An example of the relationship between the electrical conductivity and the flowing current value expressed in logarithm is stored in the storage unit 253 in the form of table data, for example. Since the sensitivity of the flow ammeter 210 is higher as the conductivity is smaller, the conductivity correction unit 230 corrects the flow current value measured by the flow ammeter 210 based on the measurement result of the conductivity expressed by logarithm. .
  • the relationship between the electrical conductivity and the flowing current value can be linearized using a logarithm as shown in Equation (2).
  • a linear relationship of monotonically increasing slope is K EC.
  • the control unit 252 determines a correction value (hereinafter referred to as “EC correction value”) based on the measurement result of the conductivity (EC).
  • the flowing current value is corrected based on the EC correction value.
  • the control unit 252 determines the EC correction value based on Expression (2) indicating the relationship between the conductivity and the flowing current value.
  • ⁇ Z EC indicates an EC correction value.
  • EC m indicates the conductivity in the standard state.
  • EC indicates the measurement result of conductivity.
  • Conductivity correction unit 230 adds the EC correction value [Delta] Z EC to flow a current value measured by the streaming current meter 210.
  • the water temperature correction unit 240 acquires the measurement result of the water temperature from the water temperature gauge 32.
  • the water temperature correction unit 240 corrects the flowing current value measured by the flowing ammeter 210 based on the measurement result of the water temperature.
  • FIG. 7 is a diagram illustrating a relationship example between the water temperature and the flowing current value.
  • the horizontal axis indicates the water temperature.
  • the vertical axis represents the flowing current value.
  • the vertical axis represents the flowing current value.
  • An example of the relationship between the water temperature and the flowing current value is stored in the storage unit 253 in the form of table data, for example.
  • the relationship between water temperature and flow current value a linear relationship with monotonically decreasing slope of K t.
  • the controller 252 determines a correction value (hereinafter referred to as “water temperature correction value”) based on the measurement result of the water temperature.
  • the flowing current value is corrected based on the water temperature correction value.
  • the control unit 252 determines the water temperature correction value based on the equation (3) indicating the relationship between the water temperature and the flowing current value.
  • ⁇ Z t represents a water temperature correction value.
  • t m represents the water temperature in the standard state.
  • t indicates the measurement result of the water temperature.
  • Operator of the water treatment system 1a defines the value of K t the water quality testing.
  • Water temperature correction unit 240 adds the water temperature correction value [Delta] Z t to flow current value measured by the streaming current meter 210.
  • the corrected flowing current value is represented by the equation (4) based on the flowing current value measured by the flowing ammeter 210, the pH correction value ⁇ Z pH , the EC correction value ⁇ Z EC, and the water temperature correction value ⁇ Z t. .
  • Corrected flowing current value Measured flowing current value + ⁇ Z pH + ⁇ Z EC + ⁇ Z t (4)
  • Injection support device 250 is an information processing device such as a computer terminal or a server device. Injection support device 250 may be a single device or a plurality of devices. When the injection support apparatus 250 is a plurality of apparatuses, the injection support apparatus 250 may be operated by cloud computing technology. The injection support apparatus 250 may perform operations on various types of data in the key value store format using cloud computing technology. In the injection support apparatus 250, a web browser may operate. In the injection support apparatus 250, at least one of monitoring, failure handling, and operation of the injection support apparatus 250 may be performed by a proxy service.
  • an entity for example, ASP: “Application” Service ”Provider
  • an entity other than the entity that operates the water treatment system 1a may act on behalf of the injection support apparatus 250 to monitor, troubleshoot, and operate.
  • the injection support apparatus 250 may be monitored, handled by the injection support apparatus 250, and operated by a plurality of entities.
  • the injection support apparatus 250 includes an interface 251, a control unit 252, and a storage unit 253. Some or all of the interface 251 and the control unit 252 are software function units that function when a processor such as a CPU (Central Processing Unit) executes a program stored in the storage unit 253, for example. Also, some or all of these functional units may be hardware functional units such as LSI (Large Scale Integration) and ASIC (Application Specific Integrated Circuit).
  • LSI Large Scale Integration
  • ASIC Application Specific Integrated Circuit
  • the interface 251 acquires the turbidity measurement result from the turbidimeter 61.
  • the interface 251 acquires the flowing current value measured by the flowing ammeter 210 from the flowing ammeter 210.
  • the measured flowing current value is corrected by at least one of the water temperature correction unit 240, the conductivity correction unit 230, and the pH correction unit 220. Therefore, the interface 251 acquires the flowing current value corrected by at least one of the water temperature correction unit 240, the conductivity correction unit 230, and the pH correction unit 220.
  • the control unit 252 acquires the flowing current value corrected by at least one of the water temperature correction unit 240, the conductivity correction unit 230, and the pH correction unit 220 from the interface 251.
  • the control unit 252 sends the target value Z SV of the flowing current value, the limit value of the injection rate RPAC of the flocculant 100, and the dilution rate D of the flocculant 100 to the outside of the injection support system 200 via the interface 251. Get from.
  • the controller 252 determines a candidate for the injection amount A PAC or the injection rate R PAC of the flocculant 100 by PI (Proportional Integral) control based on the corrected flow current value.
  • the control unit 252 may determine a candidate for the injection amount A PAC or the injection rate R PAC of the flocculant 100 by PID (Proportional Integral Derivative) control based on the corrected flowing current value.
  • control unit 252 a streaming current Z PV corrected on the basis of the water quality parameters, the difference e n between the target value Z SV of streaming current is determined based on the equation (5).
  • Z SV indicates a target value of the flowing current value (SC value).
  • Z PV indicates a flowing current value corrected based on the water quality parameter.
  • Control unit 252 calculates the difference between the difference e n-1 of the streaming current in the difference e n and (n-1) th control period of streaming current in the control period of the n-th.
  • the control unit 252 determines candidates for the injection amount of the flocculant 100 per liter of water based on the equation (6). That is, the control unit 252 determines a candidate for the injection amount of the flocculant 100.
  • a PAC K p ⁇ (e n ⁇ e n ⁇ 1 ) (6)
  • a PAC indicates the injection amount (in milliliters) of the flocculant 100 per liter of water.
  • the control unit 252 determines the injection rate of the flocculant 100 based on the equation (7).
  • R PAC A PAC ⁇ D ⁇ f ⁇ r PAC ⁇ 1 ⁇ 10 ⁇ 3 (7)
  • RPAC indicates the injection rate (in milliliters) of flocculant 100 per minute. That is, A PAC indicates the injection rate (milliliter / minute) of the flocculant 100. D indicates the dilution factor of the flocculant 100. f indicates the flow rate (liter) of water per minute. r PAC indicates the specific gravity of the flocculant 100.
  • the control unit 252 performs footback control of the injection rate of the flocculant 100 based on the corrected flowing current value. For example, when the injection rate of the flocculant 100 is within a predetermined limit value, the control unit 252 outputs the injection rate of the flocculant 100 to the adjustment unit 90. The adjustment unit 90 injects the flocculant 100 into the mixing basin 40 based on the injection rate of the flocculant 100. For example, the control unit 252 outputs the limit value to the adjustment unit 90 when the injection rate of the flocculant 100 is not within a predetermined limit value range. The adjustment unit 90 injects the flocculant 100 into the mixing basin 40 based on the limit value.
  • the storage unit 253 includes, for example, a nonvolatile storage medium (non-temporary recording medium) such as a ROM (Read Only Memory), a flash memory, and an HDD (Hard Disk Drive).
  • the storage unit 253 may include, for example, a volatile storage medium such as a RAM (Random Access Memory) or a register.
  • the storage unit 253 stores, for example, a program for causing the software function unit to function.
  • the storage unit 253 stores, for example, a data table.
  • the presentation device 260 is a display device having a display screen (presentation unit) such as a liquid crystal display (LCD).
  • the presentation device 260 acquires the target value of the injection amount of the flocculant 100 from the control unit 252 via the interface 251.
  • the presentation device 260 displays the target value of the injection amount of the flocculant 100 on the display screen.
  • the operator of the water treatment system 1a can adjust the injection amount of the flocculant 100 by operating the adjustment unit 90 so that the injection amount of the flocculant 100 becomes the target value of the flocculant 100.
  • the presentation device 260 displays a target value of the injection amount of the flocculant 100 and a determination result indicating whether the flocculant 100 is excessive or insufficient on the display screen according to control by the control unit 252. Also good.
  • the presentation device 260 may be a voice processing device including a speaker (presentation unit).
  • the presentation device 260 may present the target value of the injection amount of the flocculant 100 and a determination result indicating whether the flocculant 100 is excessive or insufficient to the operator by voice.
  • the injection support apparatus 250 and the injection support system 200 of the first embodiment include the correction unit (pH correction unit 220, water temperature correction unit 240, conductivity correction unit 230) and the control unit 252.
  • the correction unit collects the water current collected from the water storage unit such as the mixing basin 40 into which the flocculant 100 is injected, or the water flowing current value collected from the upstream side of the water storage unit with respect to the water flow. Correction based on the water quality parameters.
  • the control unit 252 determines a candidate for the injection amount or injection rate of the flocculant 100 based on the corrected flowing current value. Thereby, the injection support apparatus 250 and the injection support system 200 of the first embodiment can support the determination of the injection amount or the injection rate of the flocculant 100 even when the water quality parameter changes.
  • the conventional injection support system calculates the injection rate (injection amount) of the flocculant based on a simple relational expression for determining the injection rate of the flocculant.
  • the conventional injection support system can perform feedforward control (FF control) for the injection of the flocculant.
  • FF control feedforward control
  • Flow current meter and flow potential meter measure the electrical properties of the generated floc floc after adding a flocculant to the raw water of a water treatment system such as a water purification plant.
  • the conventional injection support system can execute feedback control (FB control) for the injection of the flocculant so that the measured values of the flowing current and the flowing potential become target values.
  • FB control feedback control
  • the simple relational expression used for feedforward control is unchanged.
  • pouring assistance system cannot follow the water quality fluctuation
  • the flocculant may be excessive or insufficient depending on the quality of the raw water.
  • raw water is taken from a plurality of water sources, and the flow rate ratio is frequently changed.
  • the operator has to re-determine the relational expression (correction expression) as appropriate using a jar test or the like. For this reason, the burden on the operator was heavy. In addition, it was difficult to inherit the skills of the operators.
  • Zeta potential is an index representing the aggregation state of particles.
  • the zeta potential is the difference between the charged particle potential in water and the electrically neutral potential. When the value of the zeta potential approaches 0, the water becomes an electric atmosphere in which charge neutralization proceeds and the water tends to aggregate. In order to properly control the state of aggregation, the zeta potential is measured continuously. The zeta potential is difficult to measure continuously in a short time.
  • the flowing current value is an index instead of the zeta potential.
  • the flowing current value is a value obtained by indirectly measuring the zeta potential.
  • the flow ammeter is effective as a sensor that can continuously measure the aggregation state.
  • the piston reciprocates inside a probe with electrodes.
  • the flow ammeter measures the generated current value.
  • the distance between the probe and the piston is, for example, 0.1 mm.
  • the charge density becomes high, and the measurement range may be exceeded.
  • the measurement accuracy may decrease.
  • the flow ammeter measures the flow current value of water between the rapid agitation pond and the floc formation pond.
  • the electrical conductivity meter measures the electrical conductivity of the landing well.
  • the conventional injection support system adjusts the flow current value of water between the rapid agitation pond and the floc formation pond and the electric conductivity of the landing well by a PID controller.
  • the injection amount is controlled by a pump.
  • the operator of the water treatment system had to obtain the relationship between the flowing current value and the water quality parameter in advance by actually conducting a water quality test.
  • the water quality test it is necessary to set up a test system so as not to affect the actual operation of the water treatment plant and to define a correction formula for each water quality parameter or water source. For this reason, the water quality test takes adjustment time at the water purification plant.
  • Another problem is that it is difficult to secure engineers with knowledge of water quality.
  • the operator of the water treatment system 1a of the first embodiment does not need to bother the raw water quality test to determine the relational expression between the flowing current value and the water quality parameter.
  • the operator of the water treatment system 1a of the first embodiment does not need to construct a correction formula for each water quality parameter or water source.
  • the operator of the water treatment system 1a of the first embodiment does not have to set up a test system that does not affect the actual operation of the water purification plant.
  • the injection support device 250 and the injection support system 200 of the first embodiment can reduce the local adjustment time.
  • the injection support apparatus 250 and the injection support system 200 according to the first embodiment can reduce the initial cost related to the introduction of the injection support system 200 using the flowing current value.
  • the injection support apparatus 250 and the injection support system 200 according to the first embodiment can reduce the amount of the flocculant used even when it is difficult to secure an engineer who has knowledge about water quality.
  • the injection support apparatus 250 and the injection support system 200 of the first embodiment can reduce sludge generation and reduce sludge disposal costs.
  • the injection support device 250 and the injection support system 200 of the first embodiment can appropriately control the injection of the flocculant 100 based on the injection rate of the flocculant 100.
  • the operator of the water treatment system 1a of the first embodiment can easily grasp the excess or deficiency of the flocculant 100 based on the flowing current value of water.
  • the operator of the water treatment system 1a of the first embodiment can easily grasp the excess or deficiency of the flocculant 100 by comparison with the target value of the flocculant 100.
  • the operator of the water treatment system 1a of the first embodiment injects the flocculant 100 following the change in water quality without frequently performing jar tests for determining the amount of the flocculant 100 to be injected. Can do.
  • the injection support apparatus 250 and the injection support system 200 of the first embodiment can reduce the burden on the operator of the water treatment system 1a.
  • the injection support apparatus 250 and the injection support system 200 of the first embodiment perform not only the use of the flocculant 100 but also the contact basin 30 by injecting the flocculant 100 in the mixing basin 40 without excess or deficiency. The amount of activated carbon used can be reduced.
  • the injection support apparatus 250 and the injection support system 200 of the first embodiment can reduce the frequency of cleaning the sand filtration building 70 and reduce the running cost.
  • the injection support apparatus 250 and the injection support system 200 according to the first embodiment can automate the injection of an appropriate flocculant 100.
  • the injection support apparatus 250 and the injection support system 200 of the first embodiment stabilize the quality of supplied water in consideration of the response to water quality fluctuations, succession of water treatment technology, and reduction of the burden on the operator. be able to.
  • the injection support apparatus 250 and the injection support system 200 of the first embodiment can reduce the influence of other factors that change due to water quality fluctuations by correcting the flowing current value.
  • the injection support apparatus 250 and the injection support system 200 according to the first embodiment can measure the balance between the charge of the suspended matter and the flocculant 100 as a flowing current value. Therefore, the injection support apparatus 250 and the injection support system 200 of the first embodiment can maintain a stable quality of treated water following the water quality change even when the water quality change occurs.
  • Injection support apparatus 250 and infusion support system 200 of the first embodiment can determine a proportional gain K p of the PID control.
  • the injection support apparatus 250 and the injection support system 200 of the first embodiment can determine a proportional gain for PID control.
  • the injection support device 250 and the injection support system 200 of the first embodiment are the target values of the flowing current values shown in FIG.
  • the turbidity of the outlet water of the settling basin 60 can be maintained below a certain value, and the injection control of the flocculant 100 can be continued.
  • the injection support device 250 and the injection support system 200 according to the first embodiment can acquire the flowing current value in the standard state without being affected by the change in the water quality by correcting the flowing current value based on the water quality parameter. Therefore, since the injection support apparatus 250 and the injection support system 200 of the first embodiment can measure the charge state of the particles, the flocculant 100 can be injected according to the fluctuation of the quality of the raw water.
  • candidates for the injection amount or injection rate of the flocculant 100 are determined. decide.
  • the second embodiment is different from the first embodiment in that the control unit 252 combines feedforward control and feedback control. In the second embodiment, only differences from the first embodiment will be described.
  • FIG. 8 is a diagram illustrating a second example of the configuration of the water treatment system 1 including the injection support apparatus 250.
  • the water treatment system 1 is referred to as a “water treatment system 1b”.
  • the contact pond 30 includes a conductivity meter 31, a water temperature meter 32, and a turbidity meter 34.
  • the turbidimeter 34 may be provided in the landing well 20.
  • the sedimentation basin 60 may not include the turbidimeter 61 shown in FIG.
  • the control unit 252 executes feedforward control (FF control). For example, the control unit 252 determines candidates for the injection rate of the flocculant 100 based on the water quality parameters of the raw water. The control unit 252 determines a candidate for the injection rate of the flocculant 100 to a value proportional to the turbidity of the raw water measured by the turbidimeter 34 (turbidity proportional method). The control unit 252 determines a candidate for the injection rate of the flocculant 100 to a value proportional to the flow rate measurement result by the flow meter 33 so that the injection rate of the flocculant 100 is constant (fixed injection rate method).
  • FF control feedforward control
  • the control unit 252 executes feedback control (FB control). For example, the control unit 252 determines a candidate for the injection rate of the flocculant 100 to be output to the adjustment unit 90 based on the flowing current value measured by the flowing ammeter 210.
  • FB control feedback control
  • the control unit 252 injects the flocculant 100 to be output to the adjustment unit 90 based on the injection rate candidate of the flocculant 100 determined by the feedforward control and the injection rate candidate of the flocculant 100 determined by the feedback control. Determine the rate.
  • the injection support apparatus 250 and the injection support system 200 of the second embodiment determine candidates for the injection amount or injection rate of the flocculant 100 before the flocculant 100 is injected into the mixing basin 40. .
  • the injection support device 250 and the injection support system 200 of the second embodiment can shorten the delay of the control time even when the water quality changes.
  • an appropriate injection rate can be determined following water quality fluctuations.
  • candidates for the injection amount or injection rate of the flocculant 100 are determined based on the turbidity measured by the turbidimeter 34 and the corrected flow current value. decide.
  • the third embodiment is different from the second embodiment in that the pH sensitivity characteristic of the flow ammeter 210 is taken into consideration. In the third embodiment, only differences from the second embodiment will be described.
  • FIG. 9 is a diagram showing an example of the relationship between conductivity and flowing current value.
  • the horizontal axis indicates the conductivity.
  • the vertical axis represents the flowing current value.
  • the flowing current value is affected by the pH sensitivity characteristic of the flowing ammeter 210.
  • the flowing current value is affected by the pH value which is one of the water quality parameters of the raw water.
  • FIG. 10 is a diagram illustrating an example of the relationship between the electrical conductivity expressed in logarithm and the corrected flowing current value.
  • the horizontal axis represents the electrical conductivity expressed in logarithm.
  • the vertical axis represents a value obtained by adding the pH correction value ⁇ Z pH calculated using Equation (1) and the measured flowing current value.
  • the value obtained by adding the pH correction value ⁇ Z pH and the measured flowing current value and the conductivity expressed in logarithm have a monotonically increasing linear relationship whose slope is KEC-pH .
  • the control unit 252 determines the pH sensitivity characteristic of the flowing ammeter 210 and the measurement result of the conductivity (EC). A correction value based on this (hereinafter referred to as “ECpH correction value”) is determined.
  • ⁇ Z EC-pH represents an EC pH correction value.
  • the change amount of the flowing current value ( ⁇ (SCD + pH correction value)) in consideration of the pH sensitivity characteristic of the total 210 is shown.
  • EC m indicates the conductivity in the standard state.
  • EC indicates the measurement result of conductivity.
  • the operator of the water treatment system 1b determines the value of KEC-pH by a water quality test.
  • the conductivity correcting unit 230 adds the EC pH correction value ⁇ Z EC-pH to the flowing current value measured by the flowing ammeter 210.
  • the injection support device 250 and the injection support system 200 of the third embodiment linearize the relationship between the conductivity and the flowing current value.
  • the injection support device 250 and the injection support system 200 of the third embodiment correct the flowing current value based on the ECpH correction value.
  • the injection support apparatus 250 and the injection support system 200 of the third embodiment can correct the flowing current value even if the raw water has water quality that is strongly influenced by pH.
  • the water quality that is strongly influenced by the pH is, for example, a water quality with low electrical conductivity.
  • the injection support apparatus 250 and the injection support system 200 according to the third embodiment can determine the injection amount or injection rate candidate of the flocculant 100 even if the water quality or the flow rate varies.
  • the injection support device 250 and the injection support system 200 of the third embodiment can reduce running costs and stabilize the quality of the treated water.
  • FIG. 11 is a diagram illustrating a third example of the configuration of the water treatment system 1 including the injection support apparatus 250.
  • the water treatment system 1 is referred to as a “water treatment system 1c”.
  • the contact pond 30 is provided with a conductivity meter 31 and a turbidity meter 34.
  • the injection support system 200 includes a flow ammeter 210, a pH correction unit 220, a conductivity correction unit 230, an injection support device 250, and a presentation device 260.
  • the conductivity meter 31 may have a temperature compensation function.
  • the conductivity meter 31 can switch the temperature compensation function between valid (present) and invalid (none).
  • the conductivity meter 31 can convert the measured conductivity into conductivity in a state where the water temperature is 25 degrees Celsius, for example.
  • FIG. 12 is a diagram showing an example of the relationship between the raw water temperature and conductivity.
  • the horizontal axis indicates the water temperature.
  • the vertical axis represents conductivity (EC).
  • the conductivity is substantially constant with respect to a change in water temperature when the temperature compensation function of the conductivity meter 31 is effective.
  • the conductivity is proportional to the change in water temperature when the temperature compensation function of the conductivity meter 31 is disabled. Therefore, when the true conductivity of the raw water is substantially constant, the control unit 252 can estimate the water temperature of the raw water based on the conductivity measured by the conductivity meter 31 whose temperature compensation function is invalid. it can.
  • the control unit 252 measures the estimated water temperature and the conductivity based on the conductivity measurement result EC t by the conductivity meter 31 whose temperature compensation function is invalid and the conductivity change amount K EC-t.
  • a correction value based on (hereinafter referred to as “EC t correction value”) is determined.
  • the flowing current value is corrected based on the EC t correction value.
  • the EC t correction value is expressed by Equation (9).
  • ⁇ Z EC-t represents an EC t correction value.
  • the change amount of the flowing current value in consideration of the water temperature of the raw water ( ⁇ (SCD + EC t correction value)) is shown.
  • EC m indicates the conductivity in the standard state.
  • EC t indicates the measurement result of conductivity by the conductivity meter 31 in which the temperature compensation function is invalid.
  • the operator of the water treatment system 1c determines the value of KEC-t through a water quality test.
  • the conductivity correcting unit 230 adds the EC t correction value ⁇ Z EC ⁇ t to the flowing current value measured by the flowing ammeter 210.
  • the corrected flowing current value is expressed by equation (10).
  • Corrected flowing current value measured flowing current value + ⁇ Z pH + ⁇ Z EC ⁇ t (10)
  • the injection support apparatus 250 and the injection support system 200 according to the fourth embodiment correct the flowing current value based on the EC t correction value. Accordingly, the injection support apparatus 250 and the injection support system 200 according to the fourth embodiment are configured such that the conductivity measurement result EC t by the conductivity meter 31 whose temperature compensation function is invalid and the conductivity change amount K EC-t. Based on the above, a change in the water temperature can be estimated.
  • the operator of the water treatment system 1c does not need to perform a water quality test for determining the water temperature correction formula shown in Formula (3).
  • the injection support device 250 and the injection support system 200 according to the fourth embodiment can reduce the time for adjusting the water treatment on site.
  • the injection support apparatus 250 and the injection support system 200 of the fourth embodiment can reduce initial costs.
  • the injection support device 250 and the injection support system 200 of the fourth embodiment can reduce the installation cost of the water temperature gauge 32.
  • the fifth embodiment is different from the fourth embodiment in that the injection support system 200 does not include the conductivity correction unit 230. In the fifth embodiment, only differences from the fourth embodiment will be described.
  • FIG. 13 is a diagram illustrating a fourth example of the configuration of the water treatment system 1 including the injection support device 250.
  • the water treatment system 1 is referred to as a “water treatment system 1d”.
  • the contact pond 30 is provided with a conductivity meter 31.
  • the injection support system 200 includes a flow ammeter 210, a pH correction unit 220, an injection support device 250, and a presentation device 260.
  • the control unit 252 determines the pH correction value based on the formula (1) indicating the relationship between the pH and the flowing current value.
  • the corrected flowing current value is expressed by Equation (11).
  • the injection support apparatus 250 and the injection support system 200 of the fifth embodiment correct the flowing current value based on the pH correction value.
  • the injection support device 250 and the injection support system 200 of the fifth embodiment have changed water quality parameters in a water purification plant with a raw water conductivity as small as about 5 mS / m or a water purification plant with a small change in conductivity. Even in this case, the determination of the injection amount or injection rate of the flocculant 100 can be assisted.
  • the injection support apparatus 250 and the injection support system 200 according to the fifth embodiment support determination of the injection amount or injection rate of the flocculant even when the water quality parameter changes in a water purification plant that does not have a conductivity meter. be able to.
  • the injection support apparatus 250 and the injection support system 200 of the fifth embodiment can reduce the period during which the coordinator adjusts the water treatment in the field in order to create the conductivity correction formula.
  • the injection support apparatus 250 and the injection support system 200 of the fifth embodiment can reduce initial costs.
  • the injection support apparatus 250 and the injection support system 200 according to the fifth embodiment can reduce the installation cost of the conductivity meter 31.
  • the sixth embodiment is different from the fourth embodiment in that the injection support system 200 does not include the pH correction unit 220. In the sixth embodiment, only differences from the fourth embodiment will be described.
  • FIG. 14 is a diagram illustrating a fifth example of the configuration of the water treatment system 1 including the injection assisting device 250.
  • the water treatment system 1 is referred to as a “water treatment system 1e”.
  • the contact pond 30 is provided with a conductivity meter 31 and a turbidity meter 34.
  • the mixing basin 40 is provided with a mixing device 41.
  • control unit 252 determines the EC t correction value based on Expression (9) indicating the relationship between the conductivity and the flowing current value.
  • the corrected flowing current value is expressed by Expression (12).
  • the injection support apparatus 250 and the injection support system 200 according to the sixth embodiment correct the flowing current value based on the EC t correction value.
  • the injection support apparatus 250 and the injection support system 200 of the sixth embodiment can be used for the injection amount or injection rate of the flocculant 100 even when the water quality parameter changes in a water purification plant where the change in the conductivity of the raw water is large. Can help make decisions.
  • the seventh embodiment is different from the second embodiment in that the injection support system 200 includes an acquisition unit 270.
  • the injection support system 200 includes an acquisition unit 270.
  • the seventh embodiment only differences from the second embodiment will be described.
  • FIG. 15 is a diagram illustrating a sixth example of the configuration of the water treatment system 1 including the injection support apparatus 250.
  • the water treatment system 1 is referred to as a “water treatment system 1f”.
  • the injection support system 200 includes a flow ammeter 210, an injection support device 250, a presentation device 260, and an acquisition device 300.
  • the acquisition device 300 includes a pH correction unit 220, a conductivity correction unit 230, a water temperature correction unit 240, and an acquisition unit 270.
  • the acquisition unit 270 includes an operation device such as a keyboard and a touch panel.
  • the touch panel may be integrated with the liquid crystal display.
  • the operation device outputs the injection amount or injection rate selected by the operator to the control unit 252 in accordance with the operation by the operator.
  • the operating device obtains a value related to an expression that determines a candidate for the injection amount or injection rate of the flocculant 100.
  • the operation device outputs a value (constant) designated by the operator by an operation by the operator to the control unit 252.
  • the value (constant) specified by the operator is, for example, the value of the slope K pH and the value of the slope K EC .
  • the values designated by the operator are, for example, the value of the slope K t and the value of the slope K EC-pH .
  • the value designated by the operator is, for example, the value of the slope K EC-t .
  • the value designated by the operator is, for example, the value of the water quality parameter in the standard state.
  • the values of the water quality parameter in the standard state are, for example, the pH value pH m in the standard state, the conductivity EC m in the standard state, and the water temperature t m in the standard state.
  • the acquisition unit 270 may be a communication device.
  • the acquisition unit 270 may acquire a value designated by the operator by remote operation using a personal computer or a tablet terminal. That is, the acquisition unit 270 may acquire a value by communication.
  • the injection support device 250 and the injection support system 200 correct the flowing current value based on the value specified by the operator. That is, the control unit 252 determines a candidate for the injection amount or injection rate of the flocculant 100 based on the value acquired by the acquisition unit 270 and the flowing current value corrected by the correction unit of the acquisition device 300. Thereby, the injection support device 250 and the injection support system 200 of the seventh embodiment determine the injection amount or injection rate of the flocculant 100 based on the value designated by the operator even when the water quality parameter changes significantly. Can help.
  • the injection amount or injection of the flocculant can help determine the rate.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

Un dispositif d'assistance à l'injection de floculant selon un mode de réalisation comprend une unité de correction et une unité de commande. La valeur du courant dynamique de l'eau recueillie à partir d'une unité de stockage d'eau dans laquelle un floculant a été injecté, ou de l'eau recueillie à partir d'un emplacement qui est en amont de l'unité de stockage d'eau par rapport à l'écoulement d'eau, est corrigée par l'unité de correction sur la base de paramètres de qualité d'eau de l'eau recueillie. La quantité candidate de floculant à injecter, ou la vitesse à laquelle le floculant doit être injecté, est déterminée par l'unité de commande sur la base de la valeur du courant dynamique corrigée.
PCT/JP2016/069269 2015-07-09 2016-06-29 Dispositif d'assistance à l'injection de floculant et système d'assistance à l'injection de floculant WO2017006823A1 (fr)

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JP2015137992A JP2017018879A (ja) 2015-07-09 2015-07-09 凝集剤注入支援装置及び凝集剤注入支援システム

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03284304A (ja) * 1990-03-30 1991-12-16 Ebara Infilco Co Ltd 凝集剤注入制御方法
JPH06304414A (ja) * 1993-04-26 1994-11-01 Michimasa Oguri 浄水場における凝集沈澱プロセスの制御装置
JP2002239307A (ja) * 2001-02-21 2002-08-27 Nishihara Watertech Corp Ltd 流動電流値による浄水用凝集剤自動注入装置
JP2004223357A (ja) * 2003-01-21 2004-08-12 Toshiba Corp 凝集剤注入制御装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03284304A (ja) * 1990-03-30 1991-12-16 Ebara Infilco Co Ltd 凝集剤注入制御方法
JPH06304414A (ja) * 1993-04-26 1994-11-01 Michimasa Oguri 浄水場における凝集沈澱プロセスの制御装置
JP2002239307A (ja) * 2001-02-21 2002-08-27 Nishihara Watertech Corp Ltd 流動電流値による浄水用凝集剤自動注入装置
JP2004223357A (ja) * 2003-01-21 2004-08-12 Toshiba Corp 凝集剤注入制御装置

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