JP2007021393A - Water treatment plant using fine bubble - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an economical and reliable water treatment plant using fine ozone bubbles. <P>SOLUTION: Ozone gas generated in an ozone generator 2 is mixed with water to be treated in an injector 3 to form a gas-liquid two-phase flow. The gas-liquid two-phase flow is pressurized by a high-pressure pump 4, and then passed through a fine bubble generator 5 comprising variable hole number type perforated plates to generate the fine ozone bubbles. In a water treatment tank 1, measured signals of a pressure gauge 10, a flowmeter 11, and a dissolved ozone concentration meter 18 are input to a controller 8, and the controller controls the revolution number of the high-pressure pump 4, the hole number of the fine bubble generator 5, and the flow rate of ozone gas generated in the ozone gas generator 2. Thereby, the injection flow rate of ozone to a water treatment tank 1 can be adjusted while maintaining a pressure for generating the fine ozone bubbles, which reduces used electric power to improve the economical efficiency of the water treatment plant. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a water treatment facility using fine bubbles that can be used for purification, sterilization, and disinfection of tap water, sewage, river water, lake water, and industrial wastewater.

  There is [Non-patent Document 1] that describes the use and effect of fine bubbles in purification, sterilization, and disinfection. Moreover, there exists [nonpatent literature 2] as what described the bactericidal effect by ozone water.

  In [Non-Patent Document 1], fine bubbles are bubbles called microbubbles having a diameter of 50 micrometers or less. Generally, bubbles of this size are dissolved in the liquid by the dissolution of the gas in the bubbles into the surrounding fluid. Since the diameter of the microbubbles decreases as they dissolve into the surrounding liquid, the inside becomes high temperature and high pressure due to the effect of surface tension, and the bubbles become finer. Although the surface area ratio to volume increases, the dissolution efficiency increases. However, the dissolution is further accelerated by Henry's law, where the solubility increases in proportion to the pressure of the gas, and the microbubbles generate radicals with bactericidal power when they disappear. However, it is described that bacteria, organic matter can be decomposed by this radical, so that purification, disinfection and disinfection effects can be obtained. Hereinafter, the fine bubbles are defined as described above.

  [Non-Patent Document 2] describes that ozone water in which gaseous ozone is dissolved has a high redox potential and has a strong bactericidal effect, and if fine bubbles are used in the production of ozone water, the dissolution rate is high. There is described an ozone sterilizer that uses less gas bubbles from the liquid surface and improves ozone utilization efficiency, and refinement of the gas phase by a water pump.

  One of the generation methods and utilization methods of fine bubbles is a method using pressure reduction as described in [Patent Document 1]. In this method, ozone gas generated by ozone generating means is mixed with water to be treated by an ejector, and water mixed with this ozone gas (referred to as mixed water) is pumped by a high-pressure pump and passed through an orifice. Is a method in which fine bubbles are generated by reducing the pressure, and the liquid in which the generated ozone fine bubbles are mixed is injected into the treatment tank and used for liquid treatment.

  In the method of generating fine bubbles described in [Patent Document 2], the fine bubbles are generated by passing through the orifice in the same manner as the fine bubble generating part described in [Patent Document 1]. An opening is formed in the shape of the flow path, and an inverter for controlling the number of revolutions of the pump is provided to control the pressurizing pressure to a pressure most suitable for generating fine bubbles.

  In the water and sewage treatment method and control method described in [Patent Document 3], fine bubbles are generated by passing through an orifice in the same manner as in the fine bubble generating section described in [Patent Document 1]. Measures ozone concentration, exhausted ozone concentration, or dissolved ozone concentration, adjusts the opening of the orifice with a small diameter to adjust the pressurization pressure, and controls the exhausted ozone concentration and dissolved ozone concentration. .

JP-A-10-225696 JP 2003-117365 A Japanese Patent Laid-Open No. 10-99877 “Characteristics of Water and New Utilization Technology”, NTS Corporation, pages 142-146, 2004 "New Technology for Utilizing Ozone", Sanyu Shobo, 74-83, 1988

  The conventional technique described in [Non-Patent Document 1] describes the characteristics of fine bubbles, but does not disclose a method for generating fine bubbles or a specific water treatment method. Further, the conventional technique described in [Non-Patent Document 2] is a method of generating bubbles by shearing the impeller of the pump, and this method of generating bubbles has a problem that the bubbles are not sufficiently miniaturized.

  In the prior art described in [Patent Document 1], the mixed water is pressurized at the upstream side of the orifice with a high-pressure pump and is reduced in pressure when passing through the orifice to generate fine bubbles, but the orifice has a fixed channel area. Therefore, there is a problem that cannot be coped with when it is necessary to change the required flow rate of the mixed water of ozone fine bubbles. Moreover, since the diameter and generation amount of fine bubbles change when the pressurizing pressure changes, there is a problem that the ozone dissolution efficiency changes and the water treatment performance becomes unstable. In order to change the pressurization pressure and flow rate by this method, it is possible to adopt a method in which a bypass channel having a flow rate adjusting valve is provided in the high-pressure pump and a part of the mixed water is passed through the bypass channel. The mixed water that has passed through the bypass flow path is wasted because it is not sent to the orifice, and the loss of power applied to the high-pressure pump increases.

  In the conventional technique described in [Patent Document 2], the pressurization pressure of the orifice can be controlled by adjusting the pump rotation speed with an inverter. However, since the orifice channel area is fixed, [Patent Document 2] As in the case of 1], when dealing with the change in the required flow rate of ozone fine bubble mixed water, there is a problem that the pressurized pressure changes and the fine bubbles cannot be generated stably.

  In the conventional technique described in [Patent Document 3], the pressure of the orifice is variably adjusted to control the pressurization pressure. By this method, the flow rate of the ozone fine bubble mixed water can also be controlled. However, when the restriction of the flow path of the orifice changes, the flow rate when passing through the orifice changes, and the amount of pressure reduction in the orifice part for generating fine bubbles changes. For this reason, when the balance between pressurization and depressurization changes, the diameter and generation amount of fine bubbles change, so that there is a problem that the ozone dissolution efficiency changes and the water treatment performance becomes unstable.

  The first object of the present invention is to control ozone pressure and the flow rate of gas-liquid two-phase flow to stabilize the diameter and generation amount of fine bubbles, thereby maintaining ozone dissolution efficiency and improving water treatment performance. To provide water treatment facilities.

  The second object of the present invention is to provide a water treatment facility that improves the operational economy by reducing the pump drive power without applying excessive pressure.

  To achieve the above object, a water treatment facility using fine bubbles according to the present invention comprises an ozone generator for generating ozone gas, an ozone gas injection device for injecting the generated ozone gas into the water to be treated, and a target to which ozone gas has been injected. A high-pressure pump that pressurizes the treated water, and a micro-bubble generating device that includes a porous plate having a plurality of communication holes in the flow path between the high-pressure pump and the water treatment tank and has a variable effective number of holes, and controls the inverter. Thus, the rotation speed is controlled so that the pressurization pressure of the high-pressure pump is within an allowable range. By adjusting the effective number of holes in the perforated plate and controlling the pressurized pressure of the high pressure pump within an allowable range, the treated water into which pressurized ozone gas has been injected is in an appropriate pressurized state upstream of the hole. Then, water can be passed through the perforated plate with an appropriate pore diameter to reduce the pressure in the hole portion, and fine bubbles can be effectively generated.

  Also, instead of variably adjusting the number of effective holes of the perforated plate, a plurality of perforated plates having different numbers of holes and a plurality of flow paths each having the perforated plates are provided, and valves are provided in the plurality of flow paths. The number of effective holes of the perforated plate provided between the high-pressure pump and the water treatment tank may be variably adjusted by switching the flow path through which water flows by opening and closing.

  Also, a portion of the water to be treated in the water treatment tank is extracted, and the ozone gas generated by the ozone generator is injected into the extracted water to be treated to form a circulation loop for the water to be treated. To be treated is mixed with water to be treated.

  In addition, by controlling the injection flow rate of water to be treated with ozone fine bubbles into the water treatment tank and the pressurized pressure upstream of the perforated plate by a high-pressure pump, the amount of ozone gas generated is controlled by the ozone generator. The amount of ozone injected into the water can be controlled.

  Moreover, the water to be treated may be directly used for mixing ozone fine bubbles into the water treatment tank, or a water tank may be provided to store the water to be treated in the aeration tank and used as the water to be treated with ozone fine bubbles. good.

  Also, a controller and a dissolved ozone concentration measuring device for the water to be treated are provided downstream from the injection point of ozone fine bubbles in the water treatment tank, and the target value of the dissolved ozone concentration of the water to be treated is input to the controller. Compare the measured value of the dissolved ozone concentration meter with the target value of the dissolved ozone concentration, calculate the excess or deficiency of the ozone amount injected into the water treatment tank, and calculate the pump rotation speed and perforated plate based on the calculation result by the controller The amount of ozone injected into the water treatment tank is adjusted by controlling the number of effective pores and the amount of ozone generated by the ozone generator. If the amount of ozone injected into the water treatment tank is insufficient, the controller The number of effective holes in the plate was increased, the number of pump revolutions was increased to maintain the pressurized pressure, the amount of ozone generated by the ozone generator was increased, and the amount of ozone injected into the water treatment tank was excessive. By the controller Reducing the effective number of pores perforated plate, Hesi the pump speed so as to maintain the applied pressure and controls to reduce the ozone generation amount of the ozone generator.

  In addition, for the purpose of control responsiveness and energy saving, a water quality meter and a flow meter for the water to be treated introduced into the water treatment tank are provided, and the water quality parameters and flow rate of the water to be treated are input to the controller to If the water quality deteriorates or the flow rate increases, the required ozone amount increment value is calculated by the controller, and if the treated water quality improves or the flow rate decreases, the required ozone amount decrement value is calculated by the calculator. The controller calculates the amount of ozone injected into the water treatment tank by controlling the number of rotations of the pump and the number of effective holes of the perforated plate based on the calculation result by the controller.

  Further, in order to prevent clogging of the holes in the perforated plate, the flow direction passing through the perforated plate is reversed and the perforated plate is backwashed. Further, as a means for injecting the generated ozone gas into the water to be treated, a gas phase suction by an ejector may be used, or a gas phase mixing and refinement function of an air diffuser may be used.

  According to the present invention, the diameter and generation amount of fine bubbles can be stabilized, the ozone dissolution efficiency can be maintained, and the water treatment performance can be improved, so that the amount of ozone used can be reduced and the economics of the water treatment facility can be improved. In addition, since the pump driving power can be reduced without applying an excessive pressurizing pressure, the operation economy in the water treatment facility can be improved.

  The state of the water treatment tank, such as the dissolved ozone concentration of the water to be treated, is fed back, and the pressure and flow rate of the gas-liquid two-phase flow are controlled by the microbubble generator to generate microbubbles with a stable bubble diameter and generation amount. Thus, the amount of ozone injected into the water treatment tank is adjusted to provide water treatment equipment with improved water treatment performance.

  Embodiment 1 of the present invention will be described below with reference to FIGS. FIG. 1 is a configuration diagram of a water treatment facility using microbubbles according to the present embodiment, FIGS. 2 to 4 are structural diagrams of a microbubble generator using a variable pore number perforated plate, and FIG. 5 is a bubble in the microbubble generator. The measurement result of a diameter distribution is shown.

The water treatment facility of the present embodiment is configured as shown in FIG. A water treatment tank 1 is provided in which sewage treatment water from a sewage treatment facility is injected and the treated water is discharged as reclaimed water, and the water treatment tank 1 is divided into a plurality of tanks by a plurality of partition plates 13. . The partition plate 13 is provided with partition plates 13a, 13c, 13e fixed at the upper portion and partition plates 13b, 13d fixed at the lower portion, and sewage treated water (also referred to as treated water) injected from the sewage treatment facility. ) Flows from the space below the partition plate 13a to the next tank on the downstream side, passes over the partition plate 13b having the lower part fixed thereto, and flows to the next tank on the downstream side, so that it is discharged as reclaimed water. It has become. A pipe line for discharging ozone is provided on the upper part of the partition plate 13b, and the exhaust ozone treatment device 12 is connected to the pipe. The waste ozone treatment device 12 is a device for treating ozone released from the treated water and accumulating in the water treatment tank 1 and releasing it to the atmosphere. A dissolved ozone concentration meter 18 is provided near the discharge port of the reclaimed water, and the dissolved ozone concentration of the reclaimed water is measured.

  On the side of the inlet of the sewage treatment water of the water treatment tank 1, a drawing water flow path 6 for taking out the sewage treatment water is connected to the lower side. The extraction flow path 6 is connected to the ozone gas injection device 3 via a flow rate adjustment valve 62. An ozone generator 2 is connected to the ozone gas injection device 3 via a flow rate adjusting valve 61 so that ozone gas can be injected. The ozone generator 2 is provided with an ozone flow meter for measuring a flow rate discharged from the ozone generator 2 (not shown). The treated water in the water treatment tank 1 is extracted from the extraction flow path 6 and flows into the ozone gas injection device 3. The ozone gas generated by the ozone generator 2 is mixed with the water to be treated by the ozone gas injector 3 to form a gas-liquid two-phase flow. As the ozone gas injection device 3, an ejector type, a diffuser type, a gas-liquid mixing type such as direct mixing is applied.

  A high pressure pump 4 is connected to the downstream side of the ozone gas injection device 3, and the high pressure pump 4 is connected to the water treatment water tank 1 through a fine bubble generating device 5. An inverter 9 for driving is connected to the high-pressure pump 4. The gas-liquid two-phase flow is sucked into the high-pressure pump 4, boosted by the high-pressure pump 4, and then flows into the fine bubble generating device 5. Here, as the high-pressure pump 4, the vortex pump is excellent in the two-phase flow discharge performance, but a general pump can also be used.

  As shown in FIG. 2, the microbubble generating device 5 includes a seal portion 24 provided in the inflow channel 7, a drive shaft 23 attached to the seal portion 24, and a shutter plate 22 attached to the drive shaft 23. The perforated plate 21 is fixed to the inflow channel 7. A pressure gauge 10 is provided on the upstream side of the fine bubble generating device 5, and a flow meter 11 is provided on the downstream side.

  As shown in FIG. 3, the perforated plate 21 is provided with a plurality of holes having the same diameter, and is processed so that the distribution of the number of holes is locally different for each fan-shaped region. As shown in FIG. 4, the shutter plate 22 is provided with a fan-shaped flow portion 22a and a baffle plate portion 22b. When the drive shaft 23 is rotated by a motor (not shown), the flow portion 22a is rotated accordingly. It has become. For this reason, the number of holes through which the gas-liquid two-phase flow passes can be changed by controlling the rotation angle of the drive shaft 23 and changing the rotation angle of the shutter plate 22. Here, the number of holes may be changed by fixing the shutter plate 22 and rotating the porous plate 21. The number of holes through which this gas-liquid two-phase flow passes is referred to as the effective number of holes for convenience.

A controller 8 for controlling the ozone generator 2, the high-pressure pump 4, and the fine bubble generator 5 is provided. The controller 8 includes a signal from the dissolved ozone concentration meter 18, a signal from the pressure gauge 10, and a flow meter 11. Signal and ozone flow meter signal are fed back.

  Here, the process of generating fine bubbles in the fine bubble generating apparatus 5 will be described in detail. The gas-liquid two-phase flow mixed with the ozone gas discharged from the high-pressure pump 4 reaches the fine bubble generating device 5 while being partially dissolved in the liquid by the pressure. The upstream side of the porous plate 21 shown in FIG. 2 has a high pressure, and the downstream side has a low pressure. The water to be treated that flows into the perforated plate 21 from the high-pressure upstream side causes a pressure loss when passing through the hole, and the flow velocity increases, so that the pressure is reduced and reduced as represented by Bernoulli's theorem. . For this reason, bubbles dissolved under pressure are deposited as fine bubbles. Further, since the flow path area increases on the downstream side of the porous plate 21, pressure recovery is achieved, but the pressure becomes unstable due to a sudden change in the flow path area, and the bubbles further collapse. Due to the reduced pressure and pressure instability, fine bubbles are generated.

  As a result of experiments, a pore diameter in the range of 0.1 mm to 5 mm is suitable for generating fine bubbles, and if the pore diameter is in the range of 0.5 mm to 2 mm, the generation of fine bubbles becomes more stable and the production efficiency Found it to be better. The pressurizing pressure was within an allowable range of 0.1 MPa to 1.0 MPa. Regarding the pressurizing pressure, the range in which fine bubble generation is more stable and advantageous in terms of cost is in the range of 0.3 MPa to 0.7 MPa.

  FIG. 5 shows the result of measuring the bubble diameter distribution of the generated bubbles using the fine bubble generating device 5 of this example. In this measurement, bubbles generated when passing through the perforated plate 21 were measured with a particle counter to obtain the relationship between the bubble diameter and the bubble number distribution. From this measurement, it was confirmed that the bubble diameter was concentrated in the microbubble region, and it was possible to generate fine bubbles having the same bubble diameter with the fine bubble generating apparatus of this example.

  In the water treatment equipment configured as described above, signals from the ozone flow meter, pressure meter 10, flow meter 11, and dissolved ozone concentration meter 18 are input, and the inverter 9 of the high-pressure pump 4 and the microbubble generator 5 are connected. The rotation angle of the shutter plate 22 and the flow rate generated by the ozone gas generator 2 are controlled. The control sequence will be described with reference to FIG.

  In step 100, input data is read. Main input data include dissolved ozone concentration set value Cs, dissolved ozone concentration allowable range ΔC, high pressure pump pressurizing pressure set value Ps, high pressure pump pressurizing pressure allowable range ΔP, injection of ozone fine bubble mixed liquid The amount allowable range ΔF and the parameter increase / decrease rate ΔX. In step 101, it is determined whether or not the measurement operation is ON. If the measurement operation is not ON, the process ends. If the measurement operation is ON, in step 102, signals from the ozone flow meter, pressure meter 10, flow meter 11, and dissolved ozone concentration meter 18 are input to the controller 8, and the dissolved ozone concentration value Cm, high pressure pump added The pressure Pm, the injection amount Fm, and the ozone generator flow rate fom are read.

In step 103, a comparison operation is performed on the set value Cs of the dissolved ozone concentration, the allowable range ΔC of the dissolved ozone concentration, and the dissolved ozone concentration value Cm in the input data. That is, the dissolved ozone concentration value Cm is compared with Cs−ΔC, Cs + ΔC, which are numerical ranges obtained by adding the allowable range ΔC of the dissolved ozone concentration to the set value Cs of the dissolved ozone concentration. If the dissolved ozone concentration Cm is between Cs−ΔC and Cs + ΔC, the timer measures the time, returns to step 101 after the set time has elapsed, and repeats the operations from step 101 to step 103.

  When the dissolved ozone concentration value Cm is lower than Cs−ΔC, or when the dissolved ozone concentration value Cm is higher than Cs + ΔC, the change rate a of the dissolved ozone concentration is calculated by Equation 1 in Step 104.

In step 105, it is determined whether or not the calculated change rate a of the dissolved ozone concentration is greater than 0. If it is greater than 0, the target value Fp of the injection amount F and the target of the ozone generation flow rate fo are calculated according to Equation 2, for example. The value fop is calculated.

  When the change rate a of the dissolved ozone concentration is 0 or smaller than 0, the target value Fp of the injection amount F and the target value fo of the ozone generation flow rate fo are calculated by Equation 3, for example.

  When the target value Fp of the injection amount F and the target value fop of the ozone generation flow rate fo are calculated, the number of holes of the perforated plate 21 is controlled in step 108 so that the injection amount value Fm falls within the range shown in Formula 4. Do.

  In step 109, the rotational speed of the high-pressure pump 4 is controlled so that the high-pressure pump pressurization pressure Pm is within the range shown in Formula 5.

  In step 110, it is determined whether or not the injection amount value Fm and the high-pressure pump pressurization pressure Pm are within the ranges of Equations 4 and 5. If they are within the ranges, the process returns to Step 101 and the operations up to Step 110 are performed. repeat. If it is not within the range, the process returns to step 108 and the operations up to step 110 are repeated.

  When the dissolved ozone concentration measured by the dissolved ozone concentration meter 18 is lower than the set value Cs−the dissolved ozone concentration allowable range ΔC, a control signal is transmitted from the controller 8 to the fine bubble generating device 5 to drive the shutter plate 22. The mechanism is controlled to rotate the shutter plate 22 to increase the number of holes. By increasing the number of holes, the pressure loss in the perforated plate 21 is reduced, the flow rate is increased, and the pressurizing pressure of the high-pressure pump 4 is decreased. The high-pressure pump pressurization pressure Pm measured by the pressure gauge 10 is fed back to the controller 8 and a control signal is transmitted to the inverter 9 of the high-pressure pump 4 so that it falls within the range shown in Equation 5, and the rotation speed of the pump 4 Is controlled to increase. In addition, a control signal is transmitted to the ozone generator 2 so as to increase the amount of ozone gas generated. In the fine bubble generating device 5, the amount of ozone injected into the water treatment tank 1 can be increased by increasing the generated flow rate of the ozone gas generating device 2 and the circulating flow rates of the extraction flow channel 6 and the injection flow channel 7.

  By controlling in this way, it is possible to control the change in the pressurizing pressure for generating ozone fine bubbles within an allowable range and increase the ozone injection amount to increase the circulation flow rate, so that the water treatment tank 1 It is possible to control the dissolved ozone concentration within an allowable range.

  When the dissolved ozone concentration measured by the dissolved ozone concentration meter 18 is higher than the set value Cs + the dissolved ozone concentration allowable range ΔC, the porous plate 21 is rotated to reduce the number of holes. By reducing the number of holes, the pressure loss in the perforated plate 21 increases, the flow rate decreases, and the pressurizing pressure of the high-pressure pump 4 increases. The high-pressure pump pressurization pressure Pm measured by the pressure gauge 10 is fed back to the controller 8 and a control signal is transmitted to the inverter 9 of the high-pressure pump 4 so that it falls within the range shown in Equation 5, and the rotation speed of the pump 4 Is controlled to decrease. In addition, a control signal is transmitted to the ozone generator 2 so as to reduce the amount of ozone gas generated.

  By controlling in this way, it is possible to control the change in the pressurizing pressure for generating ozone fine bubbles within an allowable range, and to reduce the amount of ozone injected to reduce the circulation flow rate. It is possible to control the dissolved ozone concentration within an allowable range.

  In addition, since the circulation flow rate of ozone injection can be increased or decreased while maintaining the pressurization pressure of the high-pressure pump 4 at a pressure suitable for generating fine bubbles, waste of pump power can be saved.

  The gas-liquid two-phase flow in which fine bubbles are mixed in the fine bubble generating device 5 passes through the injection flow path 7 and is discharged to the water treatment tank 1. Due to the action of the fine bubbles, the dissolution efficiency of ozone is increased, the dissolved ozone concentration is increased, and a strong disinfection action is generated. Moreover, the disinfection action is further promoted by the generation of radicals when the bubbles are dissolved.

  A portion of the water to be treated which has been injected with ozone and discharged into the water treatment tank 1 flows again into the fine bubble generating device 5 from the extraction flow path 6, and the remaining water to be treated continues its ozone oxidation action. It flows in the water treatment tank 1 and is discharged as recycled water from the treatment tank outlet.

  Here, since ozone is consumed as the water to be treated flows through the flow path of the water treatment tank 1 while being disinfected, the dissolved ozone concentration decreases. For this reason, the ozone fine bubble mixed liquid injection flow path 7 is provided with a plurality of lines, or the fine bubble generating device 5 is provided with a plurality of lines, and the ozone fine bubble mixed liquid is injected into a plurality of locations in the flow path of the water treatment tank 1. You may do it.

  According to the water treatment facility using fine bubbles of the present embodiment, the diameter and generation amount of fine bubbles can be stabilized, ozone dissolution efficiency can be maintained, and water treatment performance can be improved. Can be reduced and the economics of the water treatment facility can be improved. In addition, since the pump driving power is reduced by controlling the pressurizing pressure within an allowable range, it is possible to improve the operation economy in the water treatment facility. In addition, by calculating the water quality parameters and flow rate of the water to be treated, and controlling the pump rotation speed and the number of holes in the perforated plate by the inverter, the control responsiveness is improved and energy saving operation becomes possible. Economic efficiency can be improved.

  According to the water treatment facility using ultrafine bubbles of the present embodiment, it becomes possible to sterilize and disinfect sewage treated water without using a lot of chlorine for sterilizing and disinfecting, so the economic efficiency of the sewage treated water recycling facility is improved. Has the effect of improving the sterilization performance.

  In addition, although the water treatment tank of a present Example demonstrated the thing of the type which the to-be-processed water inject | poured the ozone fine bubble mixing water moves a some tank, contacting ozone, a storage type or a pressurization type processing apparatus It is also applicable to.

  A second embodiment of the present invention will be described with reference to FIG. The present embodiment is a modification of the first embodiment, and FIG. 7 is a structural diagram of a plurality of perforated plate channel type fine bubble generating apparatuses. In the first embodiment, the micro-bubble generating device 5 using the variable-hole-number perforated plate 21 shown in FIGS. 2 to 4 is used. However, in this embodiment, a plurality of perforated plates having a fixed number of holes. 14 and 15 are provided. In this example, the number of holes in the porous plate 14 is increased and the number of holes in the porous plate 15 is decreased.

  In the example shown in FIG. 7, two channels 19 and 20 having a porous plate 14 and a porous plate 15 are provided. A switching valve 17 is provided at the junction of the channel 19 and the channel 20, and the switching valve 17 is switched by a signal from the controller 8 to switch the channel 19 and the channel 20. The high pressure pump 4 is provided with a bypass valve 16.

  In the water treatment equipment configured as described above, when the dissolved ozone concentration measured by the dissolved ozone concentration meter 18 is lower than the set value Cs−the dissolved ozone concentration allowable range ΔC, the control signal is sent from the controller 8 to the switching valve 17. Is transmitted, and the switching valve 17 is switched to the flow path 19 side. When the flow path 19 is switched, the gas-liquid two-phase flow flows through the porous plate 14 having a large number of holes, so that the pressure loss in the porous plate 14 is reduced, the flow rate is increased, and the pressurized pressure of the high-pressure pump 4 is reduced. . The high-pressure pump pressurization pressure Pm measured by the pressure gauge 10 is fed back to the controller 8 and a control signal is transmitted to the inverter 9 of the high-pressure pump 4 so that it falls within the range shown in Equation 5, and the rotation speed of the pump 4 Is controlled to increase. In addition, a control signal is transmitted to the ozone generator 2 so as to increase the amount of ozone gas generated.

  By controlling in this way, it is possible to control the change in the pressurizing pressure for generating ozone fine bubbles within an allowable range and increase the ozone injection amount to increase the circulation flow rate, so that the water treatment tank 1 It is possible to control the dissolved ozone concentration within an allowable range.

  When the dissolved ozone concentration measured by the dissolved ozone concentration meter 18 is higher than the set value Cs + the dissolved ozone concentration allowable range ΔC, the switching valve 17 is switched to the flow path 20 side. Since the number of holes in the perforated plate 15 is small, the pressure loss increases, the flow rate decreases, and the pressurizing pressure of the high pressure pump 4 increases. The high-pressure pump pressurization pressure Pm measured by the pressure gauge 10 is fed back to the controller 8 and a control signal is transmitted to the inverter 9 of the high-pressure pump 4 so that it falls within the range shown in Equation 5, and the rotation speed of the pump 4 Is controlled to decrease. In addition, a control signal is transmitted to the ozone generator 2 so as to reduce the amount of ozone gas generated.

  By controlling in this way, it is possible to control the change in the pressurizing pressure for generating ozone fine bubbles within an allowable range, and to reduce the amount of ozone injected to reduce the circulation flow rate. It is possible to control the dissolved ozone concentration within an allowable range.

  According to the water treatment facility of the present embodiment, in addition to the effects of the first embodiment, the microbubble generator does not have a rotating part, so that the failure is reduced and the reliability of the sewage treatment water reclamation facility is improved.

  In addition, when the fine bubble production | generation apparatus 5 of a present Example is used, the flow volume adjustment of ozone fine bubble mixed liquid becomes step shape, but by increasing the number of flow paths to three or more systems, ozone fine bubble mixed liquid of Finer flow rate adjustment is possible.

  A third embodiment of the present invention will be described with reference to FIG. FIG. 8 is a configuration diagram of a water treatment facility using fine bubbles according to the present embodiment. In the present embodiment, in addition to the configuration of the first embodiment, a flow meter 25 and an organic substance concentration meter 26 are provided in the flow path of the water to be treated flowing into the water treatment tank 1, and the flow meter 25, the organic substance concentration meter 26 and the controller are provided. 8 is connected by a signal line. In FIG. 8, the organic matter concentration meter 26 is provided to measure the water quality. However, in addition to the organic matter concentration meter, the E. coli sensor, the suspended matter concentration meter, the odor sensor, the chromaticity sensor, etc. may be provided for the water quality measurement. .

  In this embodiment, when the measured value of the flow meter 25 or the organic substance concentration meter 26 is higher than the set value, a control signal is transmitted from the controller 8 to the fine bubble generating device 5 to control the driving mechanism of the shutter plate 22. The shutter plate 22 is rotated to increase the number of holes. By increasing the number of holes, the pressure loss in the perforated plate 21 is reduced, the flow rate is increased, and the pressurizing pressure of the high-pressure pump 4 is decreased. The high-pressure pump pressurization pressure Pm measured by the pressure gauge 10 is fed back to the controller 8, and a control signal is transmitted to the inverter 9 of the high-pressure pump 4 so that the number of rotations of the high-pressure pump 4 is increased. In addition, a control signal is transmitted to the ozone generator 2 so as to increase the amount of ozone gas generated.

  Thereby, the change width of the pressurization pressure for ozone fine bubble production | generation can be made small, the circulation flow volume of ozone can be increased, and the water treatment capacity of the water treatment tank 1 can be improved. As a result, the quality of the reclaimed water can be maintained.

  When the measurement value of the flow meter 25 or the organic substance concentration meter 26 is lower than the set value, the reverse operation, that is, the shutter plate 22 is rotated to decrease the number of holes and the rotation number of the high-pressure pump 4 is decreased. The ozone gas generation amount of 2 is controlled to decrease. By this operation, the circulation flow rate of ozone is reduced, and the water treatment capacity of the water treatment tank 1 can be maintained within an allowable range.

  By controlling in this way, the ozone injection amount can be adjusted on the basis of the flow rate and water quality conditions of the sewage treated water flowing into the water treatment tank 1, so that it is compared with Example 1 in which the ozone concentration after treatment is controlled by feedback. Thus, the quality of the reclaimed water can be controlled in a short time. For this reason, the load followability of the water treatment performance is improved and the fluctuation amount of the operation condition can be reduced, so that waste of pump power can be eliminated.

  According to the water treatment facility of the present embodiment, in addition to the effects of the first embodiment, the economic efficiency related to the operation of the sewage treated water reclamation facility is improved.

  A fourth embodiment of the present invention will be described with reference to FIG. FIG. 9 is a configuration diagram of a water treatment facility using fine bubbles according to the present embodiment.

  In the first embodiment, the extraction channel 6 and the injection channel 7 are laid in the water treatment tank 1, but in the present example, the second extraction channel 28 is provided in the extraction channel 6 and the injection channel 7 is provided. The second injection channel 27 is connected, and the second extraction channel 28 and the second injection channel 27 are installed in the water treatment tank 1 from above the water treatment tank 1.

  According to the present embodiment, since the second extraction channel and the second injection channel are inserted from above the water treatment tank 1, even if the water injection channel or the injection channel breaks, Since the water to be treated in the treatment tank 1 does not flow out of the water treatment tank 1, the safety of the water treatment facility can be improved. In addition, since there is no flow path insertion part or joint part below the water line, maintenance work for maintaining water tightness is not required, and the economics related to inspection can be improved.

  A fifth embodiment of the present invention will be described with reference to FIG. FIG. 10 is a configuration diagram of a sewage treatment facility to which a water treatment facility using fine bubbles is applied.

As shown in FIG. 10, the sewage treatment facility of this embodiment includes a sedimentation basin 31, a biological reaction tank 32, a final sedimentation basin 33, a sedimentation basin 31, a biological reaction tank 32, and a final sedimentation basin 33 connected in series. And a sludge treatment device 35 connected to the concentration tank 34, and a water treatment facility 30 of any of the first to fourth examples connected to the final sedimentation basin 33. ing. A flow path is connected so that a part of the sewage treated in the final sedimentation basin 33 is returned to the biological reaction tank 32.

  The sewage first flows into the settling basin 31 and the suspended solids having a large specific gravity mainly composed of organic substances are removed. The sewage from which suspended solids mainly composed of organic substances are removed flows into the biological reaction tank 32. In the biological reaction tank 32, organic nitrogen, phosphorus and the like are biologically processed. The sewage after the biological treatment flows into the final sedimentation basin 33, and suspended solids having a small specific gravity, mainly microbial flocs, are removed. The sludge removed in the sedimentation basin 31, the biological reaction tank 32 and the final sedimentation basin 33 is sent to the concentration tank 34 and is sent to the sludge treatment device 35 after concentration.

  The treated water from which the suspended solids mainly composed of microbial flocs are removed in the final sedimentation basin 33 flows into the water treatment facility 30 and treats the entire amount of sewage treated water. As described above, the water treatment facility 30 using the fine bubbles is provided at the rear stage of the final sedimentation basin 33, and the reclaimed water is used as flush water, water for spraying, landscape water, water for hydrophilicity, etc. in addition to the discharged water. Since the water treatment facility 30 using fine bubbles uses ozone, the disinfection effect is high, and there is an effect that the chlorine injection and sterilization processes can be simplified as compared with the conventional sewage treatment facility. As a result, according to the present embodiment, it is possible to simplify the sewage treatment facility, and it is possible to improve the economy related to facility construction and operation.

  A sixth embodiment of the present invention will be described with reference to FIG. FIG. 11 is another configuration diagram of a sewage treatment facility to which a water treatment facility using fine bubbles is applied.

  The sewage treatment facility of this example is configured in the same manner as in Example 5. However, as shown in FIG. 11, the water treatment facility 30 and the sterilization tank 36 are provided in parallel at the subsequent stage of the final sedimentation basin 33. In addition, a chlorine injection section is provided on the upstream side of the sterilization tank 36.

  The sewage flowing into the settling basin 31 is processed as described in the fifth embodiment up to the final settling basin 33. A part of the sewage treated water treated in the final sedimentation basin 33 flows into the sterilization tank 36 and is mixed with chlorine. After the contact time is secured in the sterilization tank 36, the treated water is discharged. The remainder of the sewage treated water treated in the final sedimentation basin 33 is guided to the water treatment facility 30 of any one of the first to fourth embodiments and processed. The treated reclaimed water is used for flushing water, watering water, landscape water, hydrophilic water, etc. in addition to the discharged water.

  According to the present embodiment, the water treatment facility 30 using fine bubbles has a high disinfection effect because ozone is used, and the chlorine injection and sterilization steps can be omitted depending on the application and the usage standard. Moreover, compared with the conventional sewage treatment facility, there is an effect that the chlorine injection and sterilization processes can be simplified. In addition, simplification of the sewage treatment facility is possible, and the economy related to the construction and operation of the facility can be improved.

  A sterilization tank 36 for injecting chlorine into the reclaimed water and mixing the chlorine may be provided after the water treatment facility 30 using fine bubbles, and the contact time in the sterilization tank 36 may be provided. After being secured, the treated water is discharged.

  A seventh embodiment of the present invention will be described with reference to FIG. FIG. 12 is another configuration diagram of a sewage treatment facility to which a water treatment facility using fine bubbles is applied.

  The sewage treatment facility of this example is configured in the same manner as in Example 6. However, as shown in FIG. 12, a sand filtration basin 37 is installed between the final sedimentation basin 33 and the water treatment facility 30, and sand filtration is performed. A part of the cleaning liquid filtered in the pond 37 is connected to the concentration tank 34. In the sand filtration basin 37, the suspended matter in the sewage treated water, and nitrogen, phosphorus, etc. adhering to the suspended matter are removed, and the treated water treated in the sand filtration basin is any one of the first to fourth embodiments. It is guided to the water treatment facility 30 and processed. As a result, the quality of the water to be treated in the water treatment facility 30 using fine bubbles is improved and the water quality is stabilized.

  According to the present embodiment, since the amount of ozone consumed by the water treatment facility using fine bubbles is reduced by improving the quality of the water to be treated, the economy related to the operation of the sewage treatment facility can be improved.

  An eighth embodiment of the present invention will be described with reference to FIG. FIG. 13 is another configuration diagram of a sewage treatment facility to which a water treatment facility using fine bubbles is applied.

  The sewage treatment facility of this example is configured in the same manner as in Example 6. However, as shown in FIG. 13, a coagulation sedimentation basin 38 is installed between the final sedimentation basin 33 and the water treatment facility 30, and the coagulation sedimentation is performed. It is connected so that the sludge in the pond 38 is returned to the concentration tank 34. A flocculant injection part is provided on the upstream side of the coagulation sedimentation basin 38, and suspended solids and organic substances in the sewage treatment water are removed by the injected flocculant. As a result, the quality of the water to be treated in the water treatment facility 30 using fine bubbles is improved and the water quality is stabilized.

  According to the present embodiment, since the amount of ozone consumed by the water treatment facility using fine bubbles is reduced by improving the quality of the water to be treated, the economy related to the operation of the sewage treatment facility can be improved.

  A ninth embodiment of the present invention will be described with reference to FIGS. FIG. 14 is a configuration diagram of a water treatment facility using fine bubbles, and FIG. 15 is a diagram illustrating a flow in the water treatment tank.

  The sewage treatment facility of this example is configured in the same manner as in Example 1, but, as shown in FIGS. A baffle plate 41 is provided in the flow path 43. In the example shown in FIG. 14, the flow paths that become the downward flow are the three positions of the flow paths 43, 43 a, and 43 b, and baffle plates 41, 41 a, and 41 b are respectively provided.

  When the fine bubbles generated in the fine bubble generating device 5 are combined in the injection flow channel 7 or the flow channel 43 in the water treatment tank 1 and the bubble diameter increases, the rising speed increases as the diameter increases. The flow path 43 may rise. If such coalesced bubbles reach the liquid level and escape into the upper space of the water treatment tank 1, not only the load of the exhaust ozone treatment increases, but the amount of ozone used for the water treatment may decrease.

In this embodiment, as shown in FIG. 15, since the baffle plate 41 is provided, the flow passage area of the flow passage 43 is reduced, and the flow velocity at the reduced portion is locally greater than the rising speed of the combined bubbles. The coalesced bubbles do not escape upward from the reduced portion, and the utilization efficiency of ozone is improved. Moreover, since a vortex is generated at a location where the flow path area below the baffle plate 41 is enlarged, the stirring and collapse of bubbles are promoted. As a result, the bubbles are refined again and the dissolution into the liquid is promoted. Accordingly, high ozone utilization efficiency and dissolution efficiency can be maintained even when coalesced bubbles are generated. The flow velocity at the contracted portion formed by the baffle plate 41 is obtained from the rated treated water flow rate and the flow path area, but preferably about 0.4 m / s or more, which is the upper limit value of the bubble rising speed. is there.

  According to the present embodiment, the utilization efficiency and dissolution efficiency of ozone can be maintained, so that the economy related to the operation of the sewage treated water reclamation facility can be maintained.

  A tenth embodiment of the present invention will be described with reference to FIGS. FIG. 16 is a configuration diagram of a water treatment facility using fine bubbles according to the present embodiment, and FIG. 17 is a diagram illustrating a flow in the water treatment tank.

  The sewage treatment facility of the present embodiment is configured in the same manner as in the first embodiment. However, as shown in FIGS. 14 and 15, the baffle plates 44 are provided above and below the injection port of the injection channel 7 in the channel 43. , A baffle plate 45 is provided.

  As described in the ninth embodiment, the baffle plate 44 causes an increase in the flow velocity and agitation and collapse of the bubbles due to the contraction of the flow, thereby preventing the combined bubbles from rising. In the baffle plate 45, the flow velocity is increased by the contraction of the flow, and the bubbles are agitated and collapsed to promote the mixing of the fine bubbles. Thereby, high utilization efficiency and dissolution efficiency of ozone can be maintained.

  According to the present embodiment, the utilization efficiency and dissolution efficiency of ozone can be maintained, so that the economy related to the operation of the sewage treated water reclamation facility can be maintained.

  An eleventh embodiment of the present invention will be described with reference to FIG. FIG. 18 is a configuration diagram of the fine bubble generating device of the present embodiment.

  The present embodiment is configured in the same manner as the fine bubble generating apparatus of the first embodiment. However, as shown in FIG. 18, a mixer 50 is provided in a flow path 49 that connects the ozone generator 2 and the ozone gas injector 3. A flow path 47 branched from the mixer 50 is connected to the fine bubble generating device 5 via a flow rate adjusting valve 48 and a gas-liquid separator 46, and the gas-liquid separator 46 is connected to the injection flow path 7. Yes. In order to promote gas-liquid separation by reducing the flow rate, the gas-liquid separator 46 is formed with an enlarged flow channel in a part of the injection flow channel 7 so that the upper volume is larger than the lower volume. .

  In the gas-liquid separator 46, coalescence of fine bubbles occurs in the injection flow path 7, and the generated coarse bubbles are gas-liquid separated. The gas phase separated by the gas-liquid separator 46 reaches the mixer 50 through the flow path 47 and is mixed with the ozone gas sent from the ozone generator 2 and flowing into the mixer 50. The ozone gas mixed by the mixer 50 is again injected into the liquid phase by the ozone gas injection device 3. As a result, the coarse bubbles generated by the combination of the fine bubbles are refined again, so that it is possible to inject bubbles with good ozone utilization efficiency and dissolution efficiency into the water treatment tank 1.

  According to the present embodiment, the utilization efficiency and dissolution efficiency of ozone can be maintained, so that the economy related to the operation of the sewage treated water reclamation facility can be maintained.

  A twelfth embodiment of the present invention will be described with reference to FIGS. 19 and 20 are system diagrams of the fine bubble generating device of the present embodiment. The fine bubble generating apparatus of the present embodiment is provided with a backwashing device so that it can be cleaned when dirt or sludge adheres to the porous plate 21.

  The fine bubble generating device 5 of the present embodiment is configured in the same manner as in the first embodiment, but a three-way valve 54 is provided in the flow path between the high pressure pump 4 and the fine bubble generating device 5 as shown in FIG. In addition, one side of the three-way valve 54 is connected to the fine bubble generating device 5, and the connecting portion is branched and connected to the sludge treatment facility via the on-off valve 51. The other side of the three-way valve is connected to the backwash channel 52 and connected to the downstream side of the fine bubble generating device 5. An opening / closing valve 53 is provided in the injection channel 7 on the water treatment tank 1 side from the connection point of the backwash channel 52.

At the time of normal operation, as shown in FIG. 19, the backwash flow path 52 side of the three-way valve 54 is closed, the open / close valve 51 is closed, and the open / close valve 53 is opened. Thereby, the ozone gas injection water discharged from the high pressure pump 4 passes through the fine bubble generating device 5 and is injected into the water treatment tank 1.

  On the other hand, at the time of backwashing, as shown in FIG. 20, the backwashing flow path 52 side of the three-way valve 54 is opened, the on-off valve 53 is closed, and the on-off valve 51 is opened. Thereby, the ozone gas injection water discharged from the high-pressure pump 4 flows backward through the fine bubble generating device 5 and flows to the sludge treatment device through the on-off valve 51. When ozone gas injection water flows back through the perforated plate 21, dirt and sludge adhering to the holes are removed, and the holes are washed. In addition, clean water such as tap water and reclaimed water is preferably used during backwashing.

  By washing the perforated plate 21 by backwashing, it is possible to generate stable fine bubbles and maintain ozone utilization efficiency and dissolution efficiency.

  According to the present embodiment, since the block of the fine bubble generating device 5 is prevented, the reliability of the sewage treated water recycling facility can be maintained. Moreover, since the utilization efficiency and dissolution efficiency of ozone can be maintained, the economy related to the operation of the sewage treatment water reclamation facility can be maintained.

  As described above, according to each embodiment, the diameter and generation amount of fine bubbles can be stabilized, the ozone dissolution efficiency can be maintained, and the water treatment performance can be improved. Can improve economic efficiency. In addition, since the pump driving power can be reduced without applying an excessive pressurizing pressure, the operation economy in the water treatment facility can be improved. In addition, by calculating the water quality parameters and flow rate of the water to be treated, and controlling the pump rotation speed and the number of holes in the perforated plate by the inverter, the control responsiveness is improved and energy saving operation is possible. Economic efficiency can be improved.

The block diagram of the water treatment facility using the fine bubble which is Example 1 of this invention. 1 is a longitudinal sectional view of a fine bubble generating device according to Embodiment 1. FIG. FIG. 2 is a plan view showing a perforated plate of the fine bubble generating device of the first embodiment. FIG. 3 is a plan view illustrating a shutter plate of the fine bubble generating device according to the first embodiment. The figure which shows the relationship between a bubble diameter and bubble number distribution. The control flow figure of the water treatment facility of Example 1. FIG. FIG. 5 is a structural diagram of a fine bubble generating apparatus that is Embodiment 2 of the present invention. The block diagram of the water treatment facility using the fine bubble which is Example 3 of this invention. The block diagram of the water treatment equipment using the fine bubble which is Example 4 of this invention. The block diagram of the sewage treatment facility which is Example 5 of this invention. The block diagram of the sewage treatment facility which is Example 6 of this invention. The block diagram of the sewage treatment facility which is Example 7 of this invention. The block diagram of the sewage treatment facility which is Example 8 of this invention. The block diagram of the water treatment equipment which is Example 9 of this invention. The figure explaining the flow in the processing tank of Example 9. FIG. The block diagram of the water treatment equipment which is Example 10 of this invention. The figure explaining the flow in the processing tank of Example 10. FIG. The block diagram of the microbubble production | generation apparatus which is Example 11 of this invention. The systematic diagram of the perforated panel washing | cleaning apparatus which is Example 12 of this invention. The systematic diagram of the perforated panel washing | cleaning apparatus which is Example 12 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Water treatment tank, 2 ... Ozone generator, 3 ... Ozone gas injection apparatus, 4 ... High pressure pump, 5 ... Fine bubble production | generation apparatus, 6 ... Extraction flow path, 7 ... Injection flow path, 8 ... Controller, 9 ... Inverter DESCRIPTION OF SYMBOLS 10 ... Pressure gauge 11, 19, 25 ... Flow meter, 12 ... Waste ozone treatment apparatus, 13 ... Partition plate, 14,
DESCRIPTION OF SYMBOLS 15,21 ... Perforated plate, 16 ... Bypass valve, 17 ... Switching valve, 18 ... Dissolved ozone concentration meter, 20, 26 ... Organic substance concentration meter, 22 ... Shutter plate, 23 ... Drive shaft, 24 ... Seal part.

Claims (11)

  An ozone generator for generating ozone gas, an ozone gas injector for injecting ozone gas generated by the ozone generator into the water to be treated, a high-pressure pump for pressurizing the water to be treated with ozone gas injected by the ozone gas injector, It has a fine bubble generating device that generates fine bubbles from the water to be treated mixed with ozone gas pressurized by the high-pressure pump, and the water to be treated mixed with ozone fine bubbles generated by the fine bubble generating device is used as a water treatment tank. Water treatment facility that uses fine bubbles to inject and disinfect treated water.   The fine bubble generating device is installed in a flow path between the high-pressure pump and a water treatment tank, and is used to change the number of effective holes of the porous plate having a plurality of communication holes. The water treatment facility using fine bubbles according to claim 1, comprising a shutter plate.   The fine bubble generating device is installed in a flow path between the high-pressure pump and the water treatment tank, and includes a plurality of perforated plates having different numbers of holes and a plurality of second plates each provided with the perforated plates. And a valve provided in each of the plurality of second flow paths, and the effective number of holes is variably adjusted by switching the second flow path through which the water flows by opening and closing the valves. A water treatment facility using the fine bubbles according to 1.   The high pressure pump is controlled by an inverter, and the rotational speed is controlled so that the pressurizing pressure of the high pressure pump falls within an allowable range. Water treatment facility.   The water treatment tank is provided with a water extraction channel for extracting water to be treated in the water treatment tank, and the water extraction channel is connected to the ozone gas injection device via a flow rate adjustment valve. Water treatment facility using fine bubbles.   Provide a dissolved ozone concentration meter for the treated water downstream from the injection location of the treated water mixed with ozone fine bubbles in the water treatment tank, and compare the measured value of the dissolved ozone concentration meter with the ozone concentration target value by the controller. And calculating an excess or deficiency of the amount of ozone injected into the water treatment tank, and controlling the number of rotations of the pump, the number of effective holes of the perforated plate, and the amount of ozone generated by the ozone generator based on the calculation result. Water treatment equipment using the fine bubbles described.   The water treatment facility using fine bubbles according to any one of claims 1 to 3, wherein the pressure applied to the upstream side of the perforated plate by the high-pressure pump is controlled in the range of 0.1 MPa to 1.0 MPa.   The water treatment facility using fine bubbles according to any one of claims 1 to 7, wherein the ozone injection device is a gas phase mixing device using an ejector or a gas-liquid mixing device using an air diffuser.   If the calculation result of excess or deficiency of the amount of ozone injected into the water treatment tank indicates that the amount of ozone injected into the water treatment tank is insufficient, the controller increases the number of effective holes of the perforated plate and When the pump rotation speed is increased so as to maintain the pressure and pressure, the amount of ozone generated by the ozone generator is controlled to increase, and when the amount of ozone injected into the water treatment tank is excessive, the controller The fine bubbles according to claim 6, wherein the number of effective holes of the perforated plate is reduced by the control, the number of rotations of the pump is reduced so as to maintain the pressurized pressure, and the amount of ozone generated by the ozone generator is reduced. Water treatment equipment used.   A water quality meter and a flow meter for measuring the quality of the water to be treated introduced into the water treatment tank are provided, and the measured value of the water quality meter and the flow rate measured by the flow meter are input to the controller, When the quality of the treated water deteriorates or the flow rate increases, the necessary ozone amount increment value is calculated, and when the quality of the treated water improves or the flow rate decreases, the required ozone amount decrement value is calculated. 5. The water treatment facility using fine bubbles according to claim 4, wherein the amount of ozone injected into the water treatment tank is adjusted by calculating and controlling the number of rotations of the pump and the number of effective holes of the perforated plate based on the calculation result. . The water treatment facility using fine bubbles according to any one of claims 1 to 10, further comprising a backwash cleaning device that reverses the flow direction passing through the porous plate and backwashes the porous plate.

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