JP6541263B2 - Stirring system, water treatment equipment - Google Patents

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a stirring system provided with a stirring tank for stirring water to be treated with a stirring blade, and a water treatment facility provided with the stirring system.

  In the water treatment equipment for treating treated water such as sewage and sewage, treated water is mixed with the treatment water and chemicals such as pH adjusters and flocculants by the stirring blade installed inside the stirring tank Means of mixing are used.

  For example, in patent document 1, as pretreatment of the methane fermentation process in a methane fermentation tank, pH adjusters, such as an alkali agent, metal cations, nutrients necessary for methane fermentation, trace elements, etc. are added and stirred and mixed. Adjustment steps are described. This adjustment step can store organic wastewater and is carried out by a control tank equipped with a stirring means.

JP, 2014-133211, A

  In a water treatment facility, power saving is required because a large amount of power is consumed to use equipment such as a pump and an aeration device.

As a result of intensive studies on the above problems, the present inventor focuses on the water flow energy of the water to be treated flowing in the stirring tank, and rotates the stirring blades by the water flow energy in a stirring tank for stirring the water to be treated with a stirring blade. The present invention has been completed by finding that power can be obtained from the stirring system by recovering the rotational energy of the stirring blade as the power.
Specifically, the following agitation system, and a water treatment facility equipped with this agitation system.

  The stirring system according to the present invention for solving the above problems recovers, as electric power, a stirring tank that stirs water to be treated with a stirring blade, and rotational energy of the stirring blade that is rotated by the flow of water to be treated in the stirring tank. A power recovery means is provided.

According to this stirring system, it is possible to rotate the stirring blade by using the water flow energy of the treated water flowing in the stirring tank, and to recover the rotational energy of the rotating stirring blade by the power recovery means as the power. And since the electric power collect | recovered by this stirring system can be utilized to another installation etc., power saving of a water treatment installation can be realized.
In addition, the rotation of the stirring blade causes the effect of stirring the water to be treated in the stirring tank while recovering the power by the power recovery means.

  Furthermore, in the stirring system according to the present invention, the stirring tank includes an inflow portion into which the water to be treated flows, an outflow portion flowing out the stirred treated water agitated by the stirring blades, and an agitation blade between the inflow portion and the outflow portion. And the inflow part at the upper part of the agitation tank and the outflow part at the lower part, or the outflow part at the upper part of the agitation tank and the inflow part at the lower part Have.

The water to be treated flows from the upper or lower portion of the stirring tank and flows out from the lower or upper portion, whereby the water to be treated flows through the entire inside of the stirring tank, so that the retention of the water to be treated can be suppressed.
Further, by providing the stirring blade between the inflow portion and the outflow portion, the water to be treated flows so as to pass through the installation region of the stirring blade, so the function of rotating the stirring blade is enhanced and the recovery amount of power is increased. be able to.

  Furthermore, the stirring system of the present invention includes a control unit that controls the rotation of the stirring blade, a stirring detection unit that detects the stirring power of the water to be treated, or a water quality detection unit that detects the water quality of the water to be treated. The control unit can execute an agitation mode in which power is supplied to rotate the agitation blades, and a power recovery mode in which the agitation blades are rotated by the flow of the water to be treated. The stirring power detected by the detection unit falls below a predetermined stirring power, or the water quality detected by the water quality detection unit is switched to the stirring mode when the water quality becomes a predetermined range.

  According to this feature, when the stirring power is lowered or when the predetermined stirring power is required, the mode is switched to the stirring mode in which the power is supplied and the stirring blade is rotated, so the function as the stirring tank is not impaired I can drive.

  Moreover, the water treatment equipment of the present invention for solving the above-mentioned problems is provided with a stirring tank for stirring the water to be treated with a stirring blade, and electric power for rotating energy of the stirring blade rotated by the flow of the water to be treated in the stirring tank. In addition to the above-mentioned stirring system provided with the electric power recovery means to collect as, it has a post-stage processing unit which processes the stirring process water stirred in the stirring tank.

  According to this water treatment facility, as described above, since the power is recovered from the stirring system, it is possible to provide a water treatment facility excellent in terms of power saving.

  Furthermore, the water treatment facility of the present invention is provided with a return line for returning the treated water treated in the post-stage treatment unit to the stirring tank, and the power recovery means is returned from the untreated water in the stirring tank or the return line. It is characterized in that the rotational energy of the stirring blade rotated by the flow of the treated water is recovered as electric power.

  According to this feature, since the stirring blade is rotated using the flow of the treated water processed by the post-stage processing unit, the amount of power recovered by the power recovery means can be increased.

According to the stirring system of the present invention, it is possible to rotate the stirring blades by using the water flow energy of the treated water flowing in the stirring tank, and to recover the rotational energy of the rotating stirring blades by the power recovery means as electric power.
And according to the water treatment equipment of the present invention, since the electric power recovered by this stirring system can be used for other equipment etc, power saving can be realized.

It is a schematic explanatory drawing which shows the structure of the stirring system of the 1st Example of this invention. It is a schematic explanatory drawing explaining the function of the control part of the stirring system of the 1st Example of this invention. It is a schematic explanatory drawing which shows the structure of the stirring system of the 2nd Example of this invention. It is a schematic explanatory drawing which shows the structure of the water treatment installation provided with the stirring system of the 3rd Example of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic explanatory drawing which shows the structure of the water treatment installation provided with the stirring system of the 1st Example of this invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

First Embodiment
FIG. 1 is a schematic explanatory view showing the configuration of a stirring system 1A according to a first embodiment of the present invention. The stirring system 1A is a stirring system installed in a water treatment facility, and, for example, a neutralization tank for adjusting the pH of the water to be treated, a mixing tank for mixing the water to be treated and a coagulant, an anaerobic organism The nutrient salts, trace elements, etc. of the above are used for the adjustment tank etc. which add to treated water.

  The water treatment equipment may be any equipment for purifying water, for example, sewage treatment equipment for treating organic wastewater or inorganic wastewater, sewage treatment equipment for treating sewage, drinking water and industrial water And water producing equipment for producing purified water and the like.

The stirring system 1A of the first embodiment adjusts the number of rotations of the stirring tank 2 for storing the water to be treated W0, the stirring blade 3 for stirring the water to be treated W0, the motor 4 for rotating the stirring blade 3 and the motor 4 A regenerative inverter device 5 is provided.
Further, the motor 4 has a function of generating electric power E by the rotational energy of the stirring blade 3 when the stirring blade 3 is rotated by the flow of the water to be treated W0, and the regenerative inverter device 5 recovers the power E It has a function as a means.

  The regenerative inverter device 5 has an inverter circuit 51 and a regenerative converter 52, the power supply 6 and the regenerative converter 52 are connected, and the inverter circuit 51 and the motor 4 are connected. The regenerative converter 52 has a function of converting alternating current supplied from the power supply 6 into direct current, and also has a function of converting direct current flowing back from the inverter circuit 51 into alternating current and regenerating the same into the power supply 6 It is.

When an alternating current is supplied from the power supply 6 to the regenerative inverter device 5, the regenerative converter 52 once rectifies it into a direct current, and the inverter circuit 51 converts the direct current into an alternating current of a predetermined frequency. And the rotation speed of the motor 4 is adjusted according to the frequency of alternating current.
On the other hand, when the stirring blade 3 rotates in a state where the current supply from the power supply 6 is stopped, the motor 4 generates a current E and flows back in the direction of the power supply 6. The current E flows into the regenerative inverter device 5 as a direct current through the inverter circuit 51, is converted into an alternating current by the regenerative converter 52, and is recovered by the power supply 6.

The configuration of circuits such as the inverter circuit and the regenerative converter may be appropriately designed in accordance with the type of motor and power source. For example, in the case of using a direct current power supply and an alternating current motor, only the inverter may be provided. In this case, the direct current from the power supply is converted to a predetermined alternating current by the inverter to rotate the motor, and the power generated from the motor rotated by the flow of the treated water flows back through the inverter and is recovered as the direct current Ru. In addition, in the case of using an AC power supply and a DC motor, only a regenerative converter may be provided.
In addition, in a stirring system using a direct current power supply and a direct current motor, a circuit may be used in which direct current power generated from the direct current motor is directly recovered to the direct current power supply or directly used for other devices.

Further, as the power recovery means, any configuration may be used as long as it can recover the rotational energy of the stirring blade rotated by the flow of the water to be treated W0 as the power. For example, as in the second embodiment to be described later, a stirring blade not having a motor and a generator that generates electric power by the energy of rotation of the stirring blade are provided, and the electric power generated by the generator is supplied to other devices. You may store electricity.
In the stirring system 1A of the first embodiment provided with the motor 4, when the flowing water energy of the water to be treated W0 is small and the stirring power is weak, the power can be supplied from the power supply 6 to increase the stirring power supplementarily. .

  The power recovered in the stirring system of the present invention may be used in any manner, and may be used for another device, or may be temporarily stored in a storage battery before being used for another device. As another apparatus, it may be used for any power apparatus regardless of the system inside or outside of the stirring system or the water treatment facility. For example, transport pumps and valve systems for treated water W0, stirred treated water W1, return sludge, etc., pH detectors, trace element detectors, water quality detectors such as oxidation reduction potential detectors, aeration devices, stirring systems, lighting, etc. It can be used to

As described above, in the stirring system 1A of the present invention, when the stirring blade 3 is rotated by the flow of the water to be treated W0, the power E generated by the motor 4 can be recovered and regenerated to the power supply 6.
Further, when the stirring blade 3 is rotated by the flow of the water to be treated W0, not only the power E is recovered, but also the stirring action of the water to be treated W0 is exhibited as a stirring system.

  Stirring tank 2 is provided with the inflow part into which treated water W0 flows in, and the outflow part which flows out agitation processing water W1 stirred by the stirring blade. In the stirring system 1A of the first embodiment, the inflow portion is provided at the upper portion of the stirring tank 2 and the outflow portion is provided at the lower portion, and the water to be treated W0 flows in from the upper portion of the stirring tank 2 and flows in the stirring tank 2 It is comprised so that it may flow out as agitation treatment water W1 from the lower part.

  Stirring vane 3 is disposed substantially at the center of stirring tank 2 and can be rotated by the flow of water to be treated W0 flowing in the inside of stirring tank 2. The shape of the stirring blade 3 is not particularly limited as long as it can be rotated by the flow of water to be treated, and a screw propeller or the like can be used, for example.

  The inflow portion and the outflow portion of the stirring tank 2 and the installation position of the stirring blade 3 are not particularly limited as long as the stirring blade 3 can be rotated by the flow of the water to be treated W0 flowing in the stirring tank 2. As in Example 1, the inflow part is provided at the upper part of the stirring tank 2 and the outflow part is provided at the lower part, the stirring blade 3 is installed between the inflow part and the outflow part, and a downward flow is formed inside the stirring tank 2 to stir Alternatively, the blades 3 may be rotated, or the inflow portion may be provided in the lower part of the stirring tank 2 and the outflow part may be provided in the upper part, and a rising flow may be formed inside the stirring tank 2 to rotate the stirring blades 3. Further, an inflow portion is installed in the upper portion of the stirring tank 2 so as to flow the water to be treated W0 tangentially, and a spiral flow is formed inside the stirring tank 2, and the stirring blade 3 is rotated in response to the spiral flow. It may be configured as follows.

  The stirring blade 3 is preferably installed between the inflow portion and the outflow portion of the stirring tank 2 from the viewpoint that rotational energy can be efficiently obtained by directly receiving flowing water energy of the water to be treated W0. Furthermore, it is preferable to provide an inflow part in the upper part of the stirring tank 2, and an outflow part in the lower part from a viewpoint that flowing water energy can be raised more.

  In addition, the flowing water energy of the to-be-processed water W0 can be obtained by the energy which arises in a water treatment installation. For example, potential energy obtained by water head pressure, or flowing water energy formed by another device such as a pump can be used.

Furthermore, the stirring system 1A of the first embodiment has a control unit 8 for controlling the rotation of the stirring blade 3.
Further, as a stirring detection unit for detecting the stirring force by the stirring blade 3, a rotation number detector 7A for detecting the number of rotations of the stirring blade 3 is provided.

  The control unit 8 can execute, for the regenerative inverter device 5, an agitation mode in which power is supplied to rotate the agitation blade and a power recovery mode in which the agitation blade is rotated by the flow of the water to be treated. When the value of the rotation speed of the rotation speed detector 7A falls below a predetermined value, the power recovery mode is controlled to be switched to the stirring mode. According to this control part 8, when the stirring power of the stirring blade 3 falls, electric power can be supplied to the stirring blade 3, and stirring power can be assisted.

Here, the detector for detecting the stirring power of the stirring blade 3 may detect anything as long as it is an index for determining the stirring state of the water to be treated W0. For example, as in the stirring system 1A of the first embodiment, a rotation number detector for detecting the rotation number of the stirring blade 3 may be mentioned.
In addition, pH detectors that detect the pH of stirred process water W0, trace element detectors that detect trace elements in stirred process water W0, redox potential detectors that detect the oxidation-reduction potential of treated water W0, etc. Water quality detectors can also be used. When a water quality detector is used as a detector for detecting the stirring force, it is sufficient to calculate the fluctuation value of the water quality at a predetermined time.

  Also, in the determination of switching between the power recovery mode and the stirring mode in the control unit 8, water quality detectors such as a pH detector, a trace element detector, an oxidation reduction potential detector, etc., instead of the stirring force detected by the stirring detection unit. The value of may be used as it is. For example, in the case of controlling in a pH adjustment tank where pH is increased by adding an alkaline agent, a pH detector is provided, and when the pH falls below a predetermined value, the mode is switched to the stirring mode with the injection of the alkaline agent. If exceeded, the configuration may be such that the mode is switched to the power recovery mode with the termination of the injection of the alkali agent. Similarly, in the adjustment tank where trace elements are added to adjust the trace element amount to a predetermined value or more, or in the denitrification pretreatment tank where methanol is added according to the predetermined oxidation reduction potential of the removal chamber, The addition and agitation modes may be configured to be synchronized.

  Next, the function of the control unit 8 of the stirring system 1A of the first embodiment will be described in detail using FIG. Note that FIG. 2 is an example of the function of the control unit 8, and the present invention is not limited to this.

FIG. 2 is a graph in which the rotational speed of the stirring blade 3 detected by the rotational speed detector 7A is recorded over time.
The water to be treated W0 flows into the stirring tank 2 and a flow of the water to be treated W0 is formed in the stirring tank 2, so that the stirring vanes 3 are rotated by the flowing water energy. Therefore, the power supply from the power supply 6 is stopped, and the power recovery mode is executed in the regenerative inverter device 5.
However, since the flow of the water to be treated W0 is not constant, the number of rotations of the stirring blade 3 is also in a state of fluctuating elevation.

  Here, the control unit 8 is controlled to switch from the power recovery mode to the stirring mode when the number of rotations P is lower than a predetermined number of revolutions P (shaded area in the figure). In the stirring mode, electric power is supplied to the regenerative inverter device 5 set to adjust to a rotation speed higher than the rotation speed P, and the rotation speed of the stirring blade 3 is increased. Then, when the rotational speed P is exceeded, the supply of power is stopped, and the stirring mode is switched to the power recovery mode.

The switching from the stirring mode to the power recovery mode may be performed at any timing. For example, switching may be performed at a timing when the rotation speed exceeds P, or switching may be performed at a timing when the rotation speed is higher than the rotation speed P set by the regenerative inverter device 5.
When switching at timing when the rotational speed exceeds P, the time of the power recovery mode becomes long, which is preferable from the viewpoint of power saving. However, when the water flow energy of the water to be treated W0 is small, the operation may not be stable because the agitation mode and the power recovery mode are frequently switched. On the other hand, when switching at a timing when the number of rotations is higher than the number of rotations P, stable operation can be performed although the power saving is somewhat inferior.

Second Embodiment
FIG. 3 is a schematic explanatory view showing a configuration of a stirring system 1B according to a second embodiment of the present invention.
In the stirring system 1B of the second embodiment, a generator 9 is provided as a power recovery means in place of the motor 4 and the regenerative inverter 5 of the first embodiment.

  As in the first embodiment, the stirring blade 3 has a shape that can be rotated by the flow of the water to be treated, and when the water to be treated W0 flows down the stirring tank 2, the stirring blade 3 is rotated by the flow. And to-be-processed water W0 is stirred by the effect | action to which the stirring blade 3 rotates, and flows out from the stirring tank 2 as the stirring process water W1.

  The generator 9 generates electric power using the rotational energy of the stirring blade 3 rotated by the flow of the water to be treated W0. Then, the power generated by the generator 9 is used for other devices. Moreover, you may store electricity temporarily, before utilizing for another apparatus.

Third Embodiment
FIG. 4 is a schematic explanatory view showing a configuration of a water treatment facility 10A provided with a stirring system 1C according to a third embodiment of the present invention.
The stirring system 1C of the third embodiment uses the stirring system 1C as a neutralization tank, replacing the rotation speed detector 7A of the stirring system 1A of the first embodiment with a pH detector 7B. Other configurations in are the same.
In addition, the water treatment facility 10A includes an aeration tank 20 and a settling tank 30 as a post-stage processing unit for treating the stirring process water W1 that has been subjected to the stirring process by the stirring system 1C of the present invention.

  The water treatment facility 10A is a facility suitable for carrying out an activated sludge method for treating organic matter in the water to be treated with aerobic microorganisms, and the aeration tank 20 is the agitating process water W2 subjected to the agitating process by the agitating system 1C. Air is supplied from the aeration tube installed at the bottom of the tank.

  In order to perform activated sludge treatment, it is preferable to adjust the pH of the agitating process water W2 flowing into the aeration tank 20 to a neutral range, and the agitating system 1C mixes the water to be treated W0 and the pH adjuster D1. Adjust pH.

  The settling tank 30 connected with the aeration tank 20 is a structure for separating the floc of the treated water and the activated sludge which decomposed | disassembled the organic substance by the aeration tank 20 by natural sedimentation. The supernatant liquid which has been left to stand for a long time in the precipitation tank 30 and separated is discharged as treated water W3, and the precipitated floc is returned to the stirring system 1C by the return line 11 as the treated water W2. In addition, the return of the treated water W2 is performed by the pump 12 provided in the return line 11.

  The lower portion of the stirring tank 2 is in communication with the lower portion of the aeration tank 20, and the stirred process water W1 subjected to the stirring processing in the stirring tank 2 is configured to flow into the aeration tank 20 by water head pressure. Thereby, a downflow is formed in the inside of the stirring tank 2, and the stirring blade 3 rotates.

  Further, in the water treatment facility 10A of the present invention, the treated water W2 is returned to the stirring tank 2 to be added to the flowing water energy of the water to be treated W0 and the flowing water energy of the treated water W2 returned by the power of the pump 12. Can also be used to recover more power.

  In stirring system 1C of a 2nd example, pH detector 7B is installed as a water quality detector which detects the water quality of treated water W0. In the switching control to the stirring mode in the control unit 8, a predetermined pH range (a neutral region in the activated sludge method) is set, and when a pH outside this is detected, the power is recovered together with the injection of the pH adjuster. The mode is switched to the stirring mode. And if it becomes a predetermined | prescribed pH range, injection | pouring of a pH adjuster will be stopped and it can be switched from stirring mode to electric power recovery mode.

Fourth Embodiment
FIG. 5 is a schematic explanatory view showing the configuration of a water treatment facility 10B provided with the stirring system 1A of the first embodiment of the present invention.
In the water treatment equipment 10B of the fourth embodiment, a methane fermentation tank 40 as a post-stage processing unit is provided at the rear stage of the stirring system 1A of the first embodiment, and the stirring system 1A is used as a control tank.

  The methane fermentation tank 40 is an anaerobic digestion method that holds anaerobic microorganisms in a floating state, an anaerobic fluidized bed method that holds anaerobic microorganisms on the surface of a fluid carrier such as sand or granular activated carbon, or a fixed bed packing material that holds anaerobic microorganisms. Well-known methane fermentation methods, such as the anaerobic fixed bed method hold | maintained on the surface of, are implemented.

  Since methane fermentation requires nutrients such as nitrogen and phosphorus and trace elements such as iron, cobalt and nickel, the water W0 is mixed with these nutrients and trace element D2 by the stirring system 1A. , As a stirred process water W1 is supplied to the methane fermentation tank 40.

  When the stirred process water W1 is supplied from the lower part of the methane fermentation tank 40, it diffuses to the layer of methane fermentation bacteria that are deposited at the bottom of the methane fermentation tank 40, and methane fermentation treatment is performed. The methane-fermented treated water W2 flows out from the upper portion of the methane fermentation tank 40 and is discharged, and a portion of the treated water W2 is returned to the upper portion of the stirred tank 2 as a circulating flow via the return line 13. By providing a circulation flow path, the fluctuation of the water to be treated W0 is buffered, and a stable methane fermentation treatment is performed.

  The stirred process water W1 is drawn from the lower portion of the stirring tank 2 using the pump 14 and is sent to the methane fermentation tank 40. Thereby, a downflow is formed in the inside of the stirring tank 2, and the stirring blade 3 rotates.

  Moreover, the return line 13 is sent to the upper part of the stirring tank 2 by natural fall from the upper part of the methane fermentation tank 40. The circulated treated water W2 will increase the head pressure in the stirring tank 2, and can assist in the formation of a downflow.

  The stirring system of the present invention can be used as a stirring system installed in a water treatment facility. For example, a neutralization tank for adjusting the pH of the water to be treated, a mixing tank for mixing the water to be treated and a coagulant, a control tank for adding nutrients, trace elements, etc. of anaerobic organisms to the water to be treated Used for

  Moreover, the water treatment equipment of the present invention can be used for equipment for purifying water. For example, sewage treatment equipment for treating organic wastewater or inorganic wastewater, sewage treatment equipment for sewage treatment, water production equipment for producing drinking water, industrial water, purified water etc. may be mentioned. .

  1A, 1B, 1C stirring system, 2 stirring tank, 3 stirring blade, 4 motor, 5 regenerative inverter device, 51 inverter circuit, 52 regenerative converter, 6 power supplies, 7A rotation number detector, 7B pH detector, 8 control unit, 9 generator, 10A, 10B water treatment equipment, 11, 13 return line, 12, 14 pump, 20 aeration tank, 30 settling tank, 40 methane fermentation tank, W0 treated water, W1 stirred treated water, W2, W3 treated water , D1 pH adjuster, D2 nutrients, E power

Claims (3)

In a stirring system provided with a stirring tank for stirring water to be treated with a stirring blade
It has a power recovery means for recovering as a power the rotational energy of the stirring blade rotated by the flow of the water to be treated in the stirring tank ,
The control unit that controls the rotation of the stirring blade, and a stirring detection unit that detects the stirring power of the water to be treated or a water quality detection unit that detects the water quality of the water to be treated,
The control unit can execute an agitation mode in which power is supplied to rotate the agitation blade, and a power recovery mode in which the agitation blade is rotated by the flow of the water to be treated.
The power recovery mode may be switched to the stirring mode when the stirring force detected by the stirring detection unit falls below a predetermined stirring force or the water quality detected by the water quality detection unit falls within a predetermined range. Stirring system to feature . The stirring tank includes an inflow portion into which the water to be treated flows, an outflow portion which flows out the stirred processed water agitated by the agitation blade, and the agitation blade between the inflow portion and the outflow portion.
The inflow part is provided in the upper part of the stirring tank, and the outflow part is provided in the lower part of the stirring tank, or
The stirring system according to claim 1, wherein the inflow part is provided at a lower part of the stirring tank, and the outflow part is provided at an upper part of the stirring tank. A stirring tank for stirring the water to be treated with a stirring blade;
And a post-treatment unit configured to treat the stirred process water stirred in the stirring tank.
A return line for returning the treated water treated by the post-stage treatment unit to the stirring tank;
A power recovery means for recovering the rotational energy of the stirring blade rotated by the flow of the water to be treated in the stirring tank or the treated water returned from the return line as electric power ;
The control unit that controls the rotation of the stirring blade, and a stirring detection unit that detects the stirring power of the water to be treated or a water quality detection unit that detects the water quality of the water to be treated,
The control unit can execute an agitation mode in which power is supplied to rotate the agitation blade, and a power recovery mode in which the agitation blade is rotated by the flow of the water to be treated.
The power recovery mode may be switched to the stirring mode when the stirring force detected by the stirring detection unit falls below a predetermined stirring force or the water quality detected by the water quality detection unit falls within a predetermined range. Features water treatment equipment.

Images