JP5873585B1 - Wastewater treatment facility drainage tank, wastewater treatment facility - Google Patents

Abstract

Disclosed is a technique capable of efficiently recovering energy contained in drainage in a drainage tank of a wastewater treatment facility. A drainage tank of a wastewater treatment facility, a water tank body having a cylindrical inner wall surface, a water supply pipe connected to the water tank body and supplying drainage into the water tank body along a tangential direction of the cylindrical inner wall surface; Connected below the water supply port of the water tank in the water tank body, has a drain pipe that discharges waste water from the water tank body, and a shaft with a blade arranged in the water tank body, forming a vortex along the cylindrical inner wall surface A generator that generates power by rotating the shaft with the blades by the energy of the drainage. [Selection] Figure 2

Description

  The present invention relates to a drainage tank of a wastewater treatment facility, a wastewater treatment facility, and a wastewater energy recovery method.

  Factory wastewater discharged from factories and hospital wastewater discharged from hospitals contain many pollutants, so after removing these pollutants or reducing their concentration below the standard value, It is necessary to discharge to public water areas such as rivers. For this reason, a waste water treatment facility (a waste water treatment device) for treating waste water is usually provided in factories and hospitals. Various techniques have been proposed for wastewater treatment (see, for example, Patent Document 1).

  This type of wastewater treatment equipment (wastewater treatment equipment) usually has a plurality of drainage tanks, and the wastewater is transferred to each drainage tank in order to remove pollutants contained in the wastewater, reduce the concentration, etc. To be done.

JP 2009-136823 A

  Conventional wastewater treatment facilities consume a large amount of power to perform wastewater treatment in various drainage tanks, and there is room for improvement from the viewpoint of energy saving.

  This invention is made | formed in view of said subject, The objective is to provide the technique which can collect | recover efficiently the energy which waste_water | drain has in the drainage tank of a wastewater treatment facility.

  In order to solve the above problems, the drainage tank of the wastewater treatment facility according to the present invention provides drainage by supplying drainage along a tangential direction of the cylindrical inner wall surface from a water supply pipe connected to the water tank body having the cylindrical inner wall surface. An eddy current was formed on the shaft, and power was generated by rotating the bladed shaft of the generator with the energy of the waste water forming the vortex.

  More specifically, the present invention is a drainage tank of a wastewater treatment facility, which is connected to the water tank body having a cylindrical inner wall surface and the water tank body, and discharges waste water along the tangential direction of the cylindrical inner wall surface. A water supply pipe that is connected to a lower side than a water supply port of the water supply pipe in the water tank main body and discharges waste water from the water tank main body, and a shaft with a blade disposed in the water tank main body. And a generator for generating electric power by rotating the shaft with blades by the energy of drainage forming a vortex along the inner wall surface of the cylinder.

  According to this, while the drainage tank of the wastewater treatment facility has conventionally consumed power, the drainage tank of the wastewater treatment facility according to the present invention efficiently uses the energy held by the wastewater. It is very good from the viewpoint of energy saving.

Here, the water tank main body may be provided with a sensor for analyzing the quality of the waste water in the water tank main body. According to the present invention, since the vortex can be formed in the waste water in the water tank body and the waste water can be efficiently stirred, the measurement accuracy of the sensor can be increased.

  Further, the sensor may be arranged at a position shifted from the water supply port by a half circumference along the cylindrical inner wall surface when viewed from a direction perpendicular to the central axis of the water tank body. According to this, since the sensor is installed at a position that is not easily affected by bubbles generated by friction between the drainage swirling along the inner wall surface of the cylinder and the inner wall surface of the cylinder, the measurement error of the sensor is less likely to occur. Water quality can be analyzed accurately.

  Moreover, this invention can also be specified as wastewater treatment equipment provided with the drainage tank to the above-mentioned. The present invention can also be specified as a wastewater energy recovery method. That is, the present invention is a drainage energy recovery method in a drainage tank of a wastewater treatment facility, wherein drainage is drained along a tangential direction of the cylindrical inner wall surface by a water supply pipe connected to the tank body having a cylindrical inner wall surface. The swirl of the drainage swirling along the inner wall surface of the cylinder by discharging the drainage from the tank body through a drain pipe connected to the water tank body below the water supply port of the water pipe. And generating power by rotating the bladed shaft of the generator with the energy of the drainage that forms a vortex along the inner wall surface of the cylinder.

  According to this, while the drainage tank of the wastewater treatment facility has conventionally consumed power, the drainage tank of the wastewater treatment facility according to the present invention efficiently uses the energy held by the wastewater. It is very good from the viewpoint of energy saving.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which can collect | recover efficiently the energy which waste_water | drain has in the wastewater tank of a wastewater treatment facility can be provided.

FIG. 1 is a diagram illustrating a schematic configuration of a wastewater treatment facility in the embodiment. FIG. 2 is an external perspective view of the adjustment tank according to the embodiment. FIG. 3 is a side view of the adjustment tank according to the embodiment. FIG. 4 is a cross-sectional view of the adjustment tank according to the embodiment. FIG. 5 is a longitudinal sectional view of the adjustment tank according to the embodiment. Drawing 6 is a figure explaining the eddy current formed by the drainage in the tank main part of the adjustment tank concerning an embodiment. FIG. 7 is a diagram for explaining a conventional method for stirring a drainage tank.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the invention will be described in detail with reference to the drawings.

<Embodiment>
FIG. 1 is a diagram illustrating a schematic configuration of a wastewater treatment facility (drainage treatment facility device) 1 according to the embodiment. The wastewater treatment facility 1 is a facility for removing pollutants contained in factory wastewater and hospital wastewater, and includes a reaction tank 11, an adjustment tank 12, an aeration tank 13, a storage tank 14, a discharge tank 15, and a control unit 2. Yes. The control part 2 is comprised by the computer provided with the arithmetic unit (CPU), the memory | storage device, the input device, the display apparatus etc., for example, and controls the whole waste water treatment facility 1. FIG.

The reaction tank 11 is a drainage tank that receives the raw water of the wastewater to be treated and removes solid residues and sediments contained in the raw water. The reaction tank 11 is provided with a drug charging device 110 capable of selectively charging the first drug and the second drug. The first drug and the second drug are the pH of the waste water.
It is a drug for adjusting. For example, a 1st chemical | medical agent is a chemical | medical agent for neutralizing acidic waste_water | drain, and a 2nd chemical | medical agent is a chemical | medical agent for neutralizing alkaline waste_water | drain. The medicine charging device 110 adds the first medicine or the second medicine to the wastewater, so that the pH of the wastewater is adjusted. The reaction tank 11 is connected to the adjustment tank 12 by a first pipe 16. In addition, a pump 17 is installed at the bottom of the reaction tank 11. When the pump 17 is driven, the wastewater treated in the reaction tank 11 is transferred to the adjustment tank 12 through the first pipe 16.

  The adjustment tank 12 is a drain tank that receives the waste water treated in the reaction tank 11 and adjusts the amount of waste water in order to optimize the reaction in the aeration tank 13. The adjustment tank 12 is provided with a pH sensor 120 that detects the pH of the waste water. The pH sensor 120 is electrically connected to the control unit 2, and the detection result is monitored by the display device of the control unit 2. Further, based on the detection result of the pH sensor 120, the control unit 2 controls the medicine injection device 110 in the reaction tank 11. That is, when the pH of the wastewater is acidic, the first medicine is added from the medicine charging device 110 to the wastewater. On the other hand, when the pH of the wastewater is alkaline, the second medicine is added from the medicine charging device 110 to the wastewater. Further, the adjustment tank 12 is connected to the aeration tank 13 by the second pipe 18, and the drainage of the adjustment tank 12 is transferred to the aeration tank 13 through the second pipe 18.

  The aeration tank 13 is a drainage tank that promotes the decomposition and oxidation of pollutants by microorganisms in the wastewater by receiving the wastewater from the adjustment tank 12 and supplying oxygen to the wastewater. At the bottom of the aeration tank 13, an aeration diffuser tube 130 for supplying oxygen into the waste water is disposed. The aeration air diffuser 130 is configured such that aeration air is sent from the blower 132 through the aeration passage 131. In the aeration tank 13, for example, the concentration of BOD, COD, nitrogen, phosphorus, etc. is reduced using microorganisms by the activated sludge method. The aeration tank 13 is connected to the storage tank 14 by a third pipe 19, and the wastewater treated in the aeration tank 13 is transferred to the storage tank 14 through the third pipe 19.

  The storage tank 14 is a drain tank that receives the wastewater treated in the aeration tank 13 and temporarily stores the wastewater. The storage tank 14 is provided with a water supply device 140 that supplies dilution water to waste water. In the storage tank 14, the wastewater is diluted with the dilution water supplied from the water supply device 140 to the wastewater as necessary. The storage tank 14 is connected to the discharge tank 15 by the fourth pipe 20, and the drainage of the storage tank 14 is transferred to the discharge tank 15 through the fourth pipe 20.

The discharge tank 15 is a drain tank that receives drainage from the storage tank 14 and analyzes the quality of the drainage. In the discharge tank 15, a BO that detects the BOD (Biochemical oxygen demand) of the wastewater
A D sensor 150 and a COD sensor 151 for detecting COD (Chemical Oxygen Demand) are installed. BOD is the biochemical oxygen demand and COD is the chemical oxygen demand. The BOD sensor 150 and the COD sensor 151 are electrically connected to the control unit 2, and these detection results are monitored by the display device of the control unit 2. In addition, based on the detection results of the BOD sensor 150 and the COD sensor 151, the control unit 2 controls the water supply device 140 in the storage tank 14 to switch on / off the supply of dilution water and adjust the supply amount. .

  A discharge pipe 21 is connected to the discharge tank 15, and the drainage discharged from the discharge tank 15 to the discharge pipe 21 is discharged into a public water area such as a river by operating a pump 22 provided in the discharge tank 15. It is released. A return pipe 23 is branched from the middle of the discharge pipe 21, and the return pipe 23 is connected to the reaction tank 11.

A flow path switching valve 24 is provided at a branch portion of the return pipe 23 that branches from the discharge pipe 21. The flow path switching valve 24 is electrically connected to the control unit 2 and controlled by the control unit 2. In the present embodiment, the control unit 2 controls the flow path switching valve 24 so that the drainage discharged from the discharge tank 15 is discharged into the river through the discharge pipe 21 in normal times. On the other hand, when either one of the BOD detected by the BOD sensor 150 and the COD detected by the COD sensor 151 exceeds the allowable range, the control unit 2 controls the flow path switching valve 24 to discharge the drainage. Switch the flow path. As a result, the waste water discharged from the discharge tank 15 is returned to the reaction tank 11 through the return pipe 23.

  In the wastewater treatment facility 1 configured as described above, pollutants are removed from wastewater discharged from factories and hospitals, and the concentration of pollutants is reduced to a standard value or less, and then discharged into public water areas such as rivers. To do.

  By the way, the wastewater treatment facility 1 according to the present embodiment includes one or a plurality of drainage tanks with generators (generators) having a function of recovering wastewater energy held by the wastewater and generating power. The details will be described below. Here, the aspect which collect | recovers drainage energy in the adjustment tank 12 mentioned above is demonstrated.

  2-5 is a figure which shows the detailed structure of the adjustment tank 12. As shown in FIG. FIG. 2 is an external perspective view of the adjustment tank 12 according to the embodiment. FIG. 3 is a side view of the adjustment tank 12 according to the embodiment. FIG. 4 is a cross-sectional view of the adjustment tank 12 according to the embodiment. FIG. 5 is a longitudinal sectional view of the adjustment tank 12 according to the embodiment. FIG. 5 shows a cross section taken along line AA shown in FIG.

  The adjustment tank 12 includes a water tank body 30, a water supply pipe 40 and a drain pipe 50 connected to the water tank body 30, and a generator 60. The water tank main body 30 is a bottomed cylindrical container (tank) having a circular bottom portion 31, and has a cylindrical inner wall surface 32 that rises from the bottom portion 31. A plurality of legs 33 are attached to the water tank body 30, and the legs 33 are fixed to a concrete floor slab (not shown).

  Below, the edge part in which the bottom part 31 is provided among the water tank main bodies 30 is defined as a lower end, and the opposite side is defined as an upper end. As shown in FIG. 2, the upper end of the water tank body 30 is an open end and is open to the atmosphere. The water supply pipe 40 is connected to the upper side slightly from the center of the water tank body 30. A connection port with the water tank main body 30 in the water supply pipe 40 is referred to as a water supply port 41. Further, the drain pipe 50 is connected to the bottom 31 of the water tank body 30. Therefore, the drain pipe 50 is connected to a portion of the water tank body 30 that is lower than the water supply port 41 in the water supply pipe 40. Further, as shown in FIG. 4, the water supply pipe 40 in the present embodiment is connected along the tangential direction of the cylindrical inner wall surface 32 in the water tank body 30.

  Here, the water supply pipe 40 is a part of the first pipe 16 shown in FIG. 1, and more specifically, is an end area on the side connected to the adjustment tank 12 in the first pipe 16. Further, the drain pipe 50 is a part of the second pipe 18 shown in FIG. 1, and more specifically, is an end area on the side connected to the adjustment tank 12 in the second pipe 18. Further, the first pipe 16 rises up to a position higher than the water supply port 41 connected to the water tank main body 30, and the head pressure (lift) of the pump 17 is sufficiently secured.

  As shown in FIG. 5, in the connection structure of the bottom 31 and the drain pipe 50 in the water tank main body 30, the end of the drain pipe 50 protrudes upward (inside the water tank main body 30) from the bottom 31. The end portion of the drain pipe 50 has a tapered portion 51 that is widened toward the top, and a drain port 52 is formed at the end portion of the tapered portion 51.

The generator 60 has a bladed shaft 61 disposed in the water tank body 30. The bladed shaft 61 includes a drive shaft 62 and a blade 63 attached to the distal end side of the drive shaft 62. In the present embodiment, a plurality of blades 63 are radially attached to the distal end side of the drive shaft 62, but the number and shape of the blades 63 are not limited to a specific mode. The generator 60 generates electric power when a shaft 61 with a blade (drive shaft 62) is rotationally driven around the axis. The drive shaft 62 of the bladed shaft 61 is arranged coaxially along the central axis of the water tank body 30.

  In the adjustment tank 12 configured as described above, waste water can be supplied into the water tank body 30 along the tangential direction of the cylindrical inner wall surface 32 of the water tank body 30. As a result, the wastewater flowing into the water tank main body 30 through the water supply pipe 40 is guided to the lower drain pipe 50 while being swung along the tangential direction of the cylindrical inner wall surface 32, thereby forming a vortex flow in the water drainage in the water tank main body 30. be able to. FIG. 6 schematically shows a vortex formed by drainage in the water tank main body 30 of the adjustment tank 12 according to the embodiment by a two-dot chain line arrow. In this way, by forming a vortex in the waste water in the water tank body 30, the bladed shaft 61 can be rotated vigorously, and the generator 60 can efficiently generate power.

  Moreover, since the taper part 51 is provided in the drain outlet 52 of the drain pipe 50 in this embodiment, discharge | emission of the waste_water | drain from the water tank main body 30 to the drain pipe 50 can be performed smoothly. Thereby, the waste water supplied into the water tank main body 30 through the water supply pipe 40 can be swirled vigorously along the cylindrical inner wall surface 32, which can contribute to an increase in the amount of power generated by the generator 60.

  Next, the installation mode of the pH sensor 120 in the adjustment tank 12 will be described. By the way, when the waste water supplied from the water supply pipe 40 to the water tank body 30 turns along the cylindrical inner wall surface 32, the coefficient of friction between the cylindrical inner wall surface 32 and the drainage flowing along this is near the water supply port 41. It is relatively high and air bubbles are easily generated. If the pH sensor 120 is installed at such a position where a large number of bubbles are generated, there is a risk of causing a measurement error. On the other hand, in the cross section of the water tank body 30, as the distance from the water supply port 41 along the cylindrical inner wall surface 32 increases, the frictional resistance of the drainage flowing along the cylindrical inner wall surface 32 decreases, and bubbles are less likely to be generated.

  Therefore, in the present embodiment, as shown in FIG. 4, when the pH sensor 120 is viewed from a direction perpendicular to the central axis of the water tank body 30, it extends along the cylindrical inner wall surface 32 from the water supply port 41 of the water supply pipe 40. Thus, it is arranged at a position shifted by half a circle (that is, a position shifted by 180 °). According to this, the pH sensor 120 can be installed at a position that is not easily affected by bubbles generated by friction between the drainage swirling along the cylindrical inner wall surface 32 and the cylindrical inner wall surface 32. Therefore, the pH of the waste water can be measured with high accuracy. Moreover, the code | symbol 120a shown in FIG. 6 is a detection part (sensor part) of the pH sensor 120. FIG. In the aspect shown in FIG. 6, since the pH sensor 120 is installed so that the detection part 120a may collide with the flow of the waste water which forms a vortex | eddy_current, the measurement variation in the pH sensor 120 can be suppressed. It should be noted that it is preferable from the viewpoint of reducing measurement variations in the pH sensor 120 that there is no axial direction of the pH sensor 120 and no swirling direction of drainage forming vortex flow and the angle is approximately 30 °.

  Next, the height when the pH sensor 120 is installed in the water tank body 30 will be described. Here, considering the case where the pH sensor 120 is installed near the height of the water supply port 41 in the water tank body 30, in this case, the influence of bubbles generated by friction between the drainage and the cylindrical inner wall surface 32 is affected. The pH sensor 120 may be received. Considering the case where the pH sensor 120 is installed at a position near the height of the drain port 52, in this case, the pH sensor 120 may be affected by the water pressure. Therefore, in the adjustment tank 12 according to the present embodiment, the pH sensor 120 is arranged at a position where the distance from the water supply port 41 and the discharge port 52 is exactly the same in the height direction of the water tank body 30. According to this, the measurement error of the pH sensor 120 can be made more difficult to occur.

  Furthermore, according to the adjustment tank 12 which concerns on this embodiment, since a vortex | eddy_current can be formed in the waste_water | drain in the water tank main body 30, the waste water in the water tank main body 30 can be stirred efficiently. Therefore, since the pH can be measured with respect to the waste water that is stirred more uniformly, there is an advantage that the reliability of the measurement result is high. FIG. 7 is a diagram for explaining a conventional method for stirring a drainage tank. As shown in the drawing, conventionally, the waste water is stirred by rotating the stirring blade P arranged in the drain tank by the motor M. In such a conventional stirring method, it is difficult to efficiently stir the waste water in the entire drainage tank, and the measurement accuracy by the sensor is likely to be lowered. In addition, in order to suppress a decrease in measurement accuracy by the sensor, it is necessary to lengthen the residence time of the drainage in the drainage tank.

  On the other hand, according to the adjustment tank 12 which concerns on this embodiment, since the waste_water | drain in the water tank main body 30 can be stirred efficiently, the measurement precision of a sensor can be improved. In this way, in this embodiment, the retention time of the waste water in the water tank body 30 can be shortened as compared with the conventional water tank while ensuring the measurement accuracy of the sensor. 30) can be made compact compared to the prior art. As a result, the energy held by the wastewater that forms a vortex while turning in the water tank body 30 is increased, which can contribute to an increase in the amount of power generation in the generator 60.

  As described above, according to the adjustment tank 12 of the wastewater treatment facility 1 in the present embodiment, the water is discharged along the tangential direction of the cylindrical inner wall surface 32 by the water supply pipe 40 connected to the water tank body 32 having the cylindrical inner wall surface 32. Along the cylindrical inner wall surface 32, the waste water is supplied into the water tank body 30 and discharged from the water tank body 30 by the drain pipe 50 connected to the water tank body 30 below the water supply port 41 of the water supply pipe 40. A swirling drainage vortex is formed, and the bladed shaft 61 of the generator 60 is driven to rotate by the energy of the drainage that forms the vortex. According to this, while the wastewater treatment facility conventionally consumes electric power, the wastewater treatment facility 1 according to the present embodiment efficiently recovers the energy held by the wastewater. It can generate electricity and is very good from the viewpoint of energy saving.

  In addition, although the aspect which collect | recovers wastewater energy in the adjustment tank 12 of the wastewater treatment facility 1 and performed electric power generation was demonstrated in the said embodiment, other drainage tanks (for example, the reaction tank 11, the aeration tank 13, the storage tank 14, Similarly, in the discharge tank 15 or the like, wastewater energy may be recovered and power generation may be performed. For example, the discharge tank 15 of the wastewater treatment facility 1 may have the same structure as the adjustment tank 12, that is, the structure shown in FIGS. Thereby, also in the discharge tank 15, there exists an effect similar to the case where the collection method of the drainage energy which concerns on this embodiment is applied to the adjustment tank 12. FIG. Further, in the discharge tank 15, when the BOD sensor 150 and the COD sensor 151 are viewed from a direction perpendicular to the central axis of the water tank main body 30, they are displaced from the water supply port 41 of the water supply pipe 40 by a half circumference along the cylindrical inner wall surface 32. It may be arranged at a position (that is, a position shifted by 180 °). As a result, as with the pH sensor 120 in the adjustment tank 12, the BOD sensor 150 and the COD sensor 151 can be made less susceptible to air bubbles generated in the water tank body 30.

As mentioned above, although embodiment which concerns on this case was described, various change, improvement, a combination, etc. are possible about these embodiment. For example, the wastewater treatment facility 1 may include a drainage tank other than that illustrated in FIG. 1, and the drainage tank may adopt the structure shown in FIGS. 2 to 5 to recover drainage energy. In this embodiment, the pH sensor 120 is installed in the adjustment tank 12 of the wastewater treatment facility 1, and the BOD sensor 150 and the COD sensor 151 are installed in the discharge tank 15, but other sensors such as a water temperature sensor are installed. Of course, it may be installed. Moreover, although the drain pipe 50 is connected to the bottom part 31 of the water tank main body 30 in the mode shown in FIGS. For example, the drain pipe 50 may be connected to a portion below the water supply port 41 in the cylindrical inner wall surface 32 of the water tank main body 30. It is possible to suitably form a vortex flow.

DESCRIPTION OF SYMBOLS 1 ... Waste water treatment equipment 2 ... Control part 11 ... Reaction tank 12 ... Adjustment tank 13 ... Aeration tank 14 ... Storage tank 15 ... Discharge tank 30 ... Water tank main body 31 ... Bottom 32 ... Cylinder inner wall surface 40 ... Water supply pipe 41 ... Water supply port 50 ... Drain pipe 51 ... Taper part 52 ... Drain port 60 ... Generator 61 ...・ Shaft with blade

Claims (3)

A drainage tank of a wastewater treatment facility,
A water tank body having a cylindrical inner wall surface;
A water supply pipe connected to the aquarium body and supplying drainage into the aquarium body along a tangential direction of the inner wall surface of the cylinder;
A drainage pipe connected below the water supply port of the water supply pipe among the water tank main body, and discharging drainage from the water tank main body,
A generator having a shaft with a blade disposed in the aquarium body, and generating electricity by rotating the bladed shaft by the energy of drainage forming a vortex along the inner wall surface of the cylinder;
A sensor for analyzing the water quality of the wastewater in the aquarium body provided in the aquarium body;
Equipped with a,
The sensor, when viewed from a direction perpendicular to the central axis of the water tank main body, is disposed at a position shifted from the water supply port by a half circumference along the inner wall surface of the cylinder.
Drainage tank for wastewater treatment equipment. A drainage tank of a wastewater treatment facility,
  A water tank body having a cylindrical inner wall surface;
  A water supply pipe connected to the aquarium body and supplying drainage into the aquarium body along a tangential direction of the inner wall surface of the cylinder;
  A drainage pipe connected below the water supply port of the water supply pipe among the water tank main body, and discharging drainage from the water tank main body,
  A generator having a shaft with a blade disposed in the aquarium body, and generating electricity by rotating the bladed shaft by the energy of drainage forming a vortex along the inner wall surface of the cylinder;
  A sensor for analyzing the water quality of the wastewater in the aquarium body provided in the aquarium body;
  With
  The sensor is disposed at an intermediate position between the drain outlet of the drain pipe and the water inlet in the height direction of the water tank body.
  Drainage tank for wastewater treatment equipment. Wastewater treatment facility comprising a drain tank according to claim 1 or 2.