JP3104867B2 - Treatment water discharge device for batch type water treatment tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treated water discharge device for a batch type water treatment tank, and more particularly, to a treated water discharge device having a float which is floated on the surface of the treated tank when the treated water is discharged, and which is raised and held above the water surface when the discharge is stopped. The present invention relates to a treated water discharge device for a batch type water treatment tank using a water collecting device.

[0002]

2. Description of the Related Art A batch activated sludge method for purifying wastewater is described as follows.
In accordance with a set time schedule, the processes of inflow, aeration, sedimentation, and discharge of wastewater are sequentially repeated as one cycle in a single treatment tank, and treated water is intermittently discharged. When discharging the treated water, scum or settled sludge is involved to collect water (hereinafter referred to as sludge roll-up).
And it is necessary to discharge only the treated water. Tokuho as a treated water discharge device with little settling sludge
Japanese Patent Application Publication No. 6-018603 discloses a clarified water discharge device for a wastewater treatment tank in which a suction direction of a pump is always kept horizontal by a link mechanism. JP-A-3-174202 discloses a treated water discharge device for a water treatment tank in which a collecting weir device with a float is held at the other end of a support arm member whose one end is pivotally supported on the water surface of the treatment tank.

FIGS. 3 and 4 show a treated water discharging device disclosed in Japanese Patent Application Laid-Open No. 3-174202. The treated water discharge device shown in FIG.
Arm 3, one end of which is pivotally supported by a pivot pin 40a fixed at a position higher than the high water level HWL, a collecting weir device 19a held at a free end of the support arm 3, and below the surface of the treated water 2. The fixed discharge pipe 14 penetrating the wall of the processing tank 1 and the collecting weir device 19a
Swivel fitting on the upper end communicating with the lower part and the discharge pipe 14
A telescoping drain device 15a having a lower end coupled at 45 and a lifting mechanism 48 coupled to the support arm member 3 to pivot the support arm member 3 about a pivot pin 40a. When the drainage is stopped, the water collecting weir device 19a is held at a position higher than the high water level HWL of the treatment tank 1 by the upward rotation of the support arm member 3 by the lifting mechanism 48, and the downward rotation of the support arm member 3 by the lifting mechanism 48 during the drainage operation. By the movement, the catch weir device 19a is lowered onto the treated water surface, and the treated water 13 flows down from the catch weir device 19a to the telescopic drainage device 15a.

[0004] The treated water discharge devices of Figs. 3 and 4 have the following advantages. That is, since the water collecting weir device is raised above the water surface during the stirring / aeration step, it is possible to reliably prevent untreated water from flowing into the water collecting weir device. In addition, since the discharge pipe can be fixed to the processing tank wall by using a telescopic drainage pipe device,
Excellent workability and waterproof properties. Further, since the rotation center of the support arm member is provided on the water surface, the downward speed of the water collecting weir at the free end of the support arm member can be reduced as the sludge approaches, and the actual overflow weir load can be reduced. It is difficult for sludge to roll up.

[0005]

However, in the conventional treated water discharger shown in FIGS. 3 and 4, the amount of sludge settled in the settling process varies in each cycle (hereinafter referred to as a treatment cycle) of the batch activated sludge method. In such a case, the sludge may be raised in the discharging step. In other words, the conventional discharge device predicts the amount of settled sludge in each treatment cycle,
The low water level LWL is set based on the predicted sedimentation amount, and in the discharging process, the falling of the water collecting weir device 19a to the low water level LWL or less is prevented to prevent sludge from being lifted. Therefore, if sludge settling in the settling process of a certain treatment cycle exceeds the expected, the low water level LWL will be set in the subsequent discharging process.
There is a possibility that the collecting weir device 19a may lift sludge upward.

Accordingly, an object of the present invention is to provide a treated water discharge device for a batch type water treatment tank that can reliably prevent sludge from being rolled up.

[0007]

Means for Solving the Problems Referring to the embodiment of FIGS.
In comparison, the treated water discharge of the batch type water treatment tank of the present inventionapparatus
Is movable to a treated water discharge pipe 14 fixed to the batch type water treatment tank 1.
A water collecting hole 10 communicating through a water pipe device 15 and a surrounding of the water collecting hole.
Water collecting device 19 with float 4, depending on lifting signal
Set the water collecting device 19 higher than the high water level HWL of the treatment tank 1 (see FIG. 3).
Lifting device 46 that raises and holds the water to a position
Distance detector 8 attached downward to 19, and pull up
Connected to the sensing device 46 and the distance detector 8And residual water required
Is setEquipped with a control device 6It is.

In use, the release signal is released.
When the water collecting device 19 lands on the water surface 2 of the treatment tank,
The distance L1 from the water surface 2 to the top surface of the settled sludge 16 is detected.
The control device 6 sets the distance L1 to the top surface of the sludge 16 and
Calculating the dischargeable water amount based on the remaining necessary water amount and
At the end of the discharge of the dischargeable water, it is raised to the lifting device 46
Output a signal.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The lifting device 46 shown in FIGS.
The water collecting device 19 is lifted and held above the treatment tank water surface 2 in response to the output of the lifting signal from the control device 6, and the water collecting device 19 is lowered to the water surface 2 by releasing the lifting signal. For example, the control device 6 may be provided with the inflow, aeration, precipitation,
The time schedule of each step of discharging can be stored, and the control device 6 can control the release of the pull-up signal according to the time schedule.

As shown in FIG. 2, the water collecting device 19 has a water collecting hole 10 connected to the upper end of a movable drainage device 15 and a float 4 around the water collecting hole 10. The treated water flows down from the water hole 10 to the movable drainage device 15. The treated water that has flowed down is discharged out of the tank from a discharge pipe 14 communicating with a lower end of a movable drain pipe device 15 (FIG. 1). By making the drainage pipe device 15 movable, the lower end of the drainage pipe device 15 is connected to the discharge pipe 14 fixed to the treatment tank 1 even though the water collecting device 19 at the upper end of the drainage pipe device 15 is raised or lowered. Can be combined.

According to the present invention, the distance detector 8 is attached to the water collecting device 19, and when the water collecting device 19 lands on the water surface 2 of the treatment tank,
From the sludge 16 to the top surface of the sludge 16 is detected. An example of the distance detector 8 is an ultrasonic range finder.
Any instrument capable of detecting the distance to the top surface of the sixteen can be used. By detecting the distance detector 8 when the water collecting device 19 lands on the sufficiently clear treated water immediately after the end of the sedimentation step, an error in the detection distance caused by floating sludge or the like is avoided, and the water is collected from the water surface 2. An accurate distance L1 to the top surface of the sludge 16 can be detected.

The distance detector 8 is connected to the control device 6, and the distance from the water surface 2 detected by the distance detector 8 to the top surface of the sludge 16
L1 is transmitted to the control device 6, and the control device 6 calculates the dischargeable water amount of the treated water based on the distance L1. For example, when the treatment tank 1 has a constant cross-sectional area S, the maximum dischargeable water amount is calculated as the product of the constant cross-sectional area S and the distance L1 (S × L1), and the actual dischargeable water amount is maximum dischargeable. It can be determined appropriately based on the amount of water. However, the method of calculating the dischargeable water amount is not limited to the above example.

Preferably, a distance L2 corresponding to the amount of residual water required for preventing sludge from being rolled up is set in the control device 6,
The dischargeable water amount is calculated based on the distance L1 and the distance L2. In the above example, for example, when the distance L2 corresponding to the required remaining water amount of about 30 cm is set above the sludge 16, the dischargeable water amount is set to the constant sectional area S and the difference L3 between the distances L1 and L2 (L3 = L1−L2). And (S × L3). By setting the required amount of residual water, the drainage process can be stopped while leaving a margin above the sludge top surface.

In the process of discharging treated water, the cumulative discharge water amount is measured, and the control device 6 compares the cumulative discharge water amount with the dischargeable water amount to detect the end of discharge of the dischargeable water amount. A lifting signal is output to the lifting device 46 to stop the discharge of the treated water. The discharged accumulated water amount can be obtained, for example, by measuring the lowering position of the water collecting device 19 by the lifting device 46. Also exhaust pipe 14
A flow meter or the like is provided in the apparatus to measure the cumulative amount of discharged water.

According to the present invention, the dischargeable water amount is obtained at the start of the discharge step in each treatment cycle of the batch activated sludge method, and the discharge step is terminated immediately after the dischargeable water amount is discharged. Even if the value fluctuates, it is possible to reliably prevent sludge from being rolled up in the discharging step. Further, in the present invention, since the distance detector is brought into contact with the treated water only at the time of the drainage process, it is possible to reduce the adhesion of dirt to the detector as compared with a case where the distance detector is fixed to the treatment tank and is constantly in contact with the wastewater. And the necessity of maintenance and inspection can be reduced. Further, since the distance detector is moved up and down together with the water collecting device, an independent driving device for the detector is not required, and the distance detector can be easily added to an existing treated water discharge system.

As described above, the object of the present invention is to provide a treated water discharge device for a batch type water treatment tank capable of reliably preventing sludge from being rolled up.
The provision of location "can be achieved.

[0017]

1 and 2, a pivot device 40 is fixed at a position higher than a high water level HWL of a treatment tank 1, and a pivot pin 40 of the pivot device 40 is fixed.
The embodiment of the present invention in which a supporting arm member 3 whose one end is pivotally supported is provided at a, and a water collecting device 19 is held at a free end of the supporting arm member 3 is shown. The lifting device 46 is provided above the supporting arm member 3, and the lower end of the lifting device 46 is connected to a bracket 52 provided on the supporting arm member 3 by a locking pin 53, and the supporting arm member 3 is pivotally supported by the lifting device 46. The water collecting device 19 is pulled up and held at a position higher than the high water level HWL of the treatment tank 1 by rotating the water collecting device 19 around 40a. The lifting device 46 can be, for example, an electric cylinder. Reference numeral 9 in FIG.
46, a protection cover for accommodating the control device 6 and the like.

FIG. 2 shows an example of the water collecting device 19. The water collecting device 19 shown in FIG. 2 has a water collecting pipe 21 and a pair of floats 4 arranged on both sides thereof in parallel via a horizontal member 22. The water collecting pipe 21 is rotatably attached to the horizontal member 22 by pins at both ends of the water collecting pipe 21, and the pair of floats 4 is floated horizontally on the water surface 2 of the treated water with the water collecting pipe 21, so that the pair of floats 4 is connected to the water collecting pipe. It fulfills the function of preventing scum from flowing into 21. An upward water collecting hole 10 is formed in the water collecting pipe 21, and a movable drainage pipe device 15 is connected to the lower part of the central part through a T-shaped joint 11. The movable drainage pipe device 15 shown in FIG. 1 is an upper drainage pipe communicating with the T-shaped joint 11 from below.
26, and a lower drain pipe 27 connected to the upper drain pipe 26 and the discharge pipe 14 of the treatment tank 1 via a swivel fitting 45, respectively. Reference numeral 29 in FIG. 2 indicates a flange for connecting the T-shaped joint 11 and the upper drain pipe 26. Water collecting pipe from water collecting hole 10
The treated water flowing into 21 is a T-shaped joint 11, an upper drain pipe 26,
Then, through the lower drain pipe 27, the water is discharged from the discharge pipe 14 penetrating the processing tank wall under the water surface of the processing tank 1 to another room.

In the embodiment shown in FIG. 1, a winding drum 5 is provided above the supporting arm member 3, and the drum 5 and the supporting arm member 3 are provided.
A wire 7a made of, for example, stainless steel is stretched between them, a connection cable 7 that is loosely stretched between the drum 5 and the distance detector 8 is provided, and the end of the connection cable 7 on the drum 5 side is connected to the control device 6. The connection is made, and the wire 7a and the cable 7 are wound around the drum 5. When the discharge is stopped, the wire 7a is stretched between the support arm member 3 and the drum 5 on the water surface,
The drum 5 winds up the wire 7a and the cable 7. At this time, by winding the wire 7a and the cable 7 together, the cable 7 can be kept gently stretched while the wire 7a is tensioned, and the cable 7 can be protected from excessive tension load. On the other hand, at the time of discharging the treated water, the support arm member 3 descends against the winding force of the drum 5, and the wire 7 a and the cable 7 are also unwound from the drum 5 according to the descending of the support arm device 3. Also in this case, the wire 7a and the cable 7 are fed out of the drum 5 integrally.

In the embodiment shown in FIGS. 1 and 2, instead of detecting the end of discharge by comparing the accumulated discharge water amount and the dischargeable water amount, the control device 6 uses the dischargeable water amount and the flow rate of water collected by the water collection device 19. The scheduled discharge time is calculated, and the end of the discharge can be determined based on the lapse of the scheduled discharge time. In this case, the controller 6 outputs a pulling signal to the pulling device 46 when the scheduled discharge time has elapsed. The discharge flow rate of the water collecting device 19 can be determined before the operation of the processing cycle is started based on the position of the water collecting hole 10 with respect to the float 4 and the like. By calculating the scheduled discharge time, preparation for the next step in the processing cycle can be performed in parallel with the discharge step, so that efficient operation of the processing cycle can be achieved.

In the embodiment shown in FIG. 1, the lifting device 46 is an electric cylinder, and the downward pressing force applied to the water collecting device 19 from the electric cylinder is controlled by the pressing signal of the control device 6. That is, the flow rate of water collected by the water collecting device 19 is increased by applying a downward force against the buoyancy of the float 4, and the flow rate of water collected by the water collecting device 19 is appropriately adjusted by a change in a push-down signal from the control device 6. For example, by reducing the flow rate of water collection as the water collecting device 19 approaches the settled sludge 16, more reliable prevention of sludge roll-up can be expected.

[0022]

As described above, the treated water discharge device of the batch type water treatment tank according to the present invention uses the distance detector to measure the distance from the water surface to the top of the settled sludge at the time of landing on the water surface of the treatment tank of the water collecting device. Since the distance is detected, the dischargeable water amount is calculated based on the detected distance and the remaining required water amount, and the water collecting device is raised above the water surface of the treatment tank when the discharge of the dischargeable water amount is completed, the following remarkable effects are obtained.

(A) Even if the amount of the settled sludge varies in each treatment cycle, the sludge can be reliably prevented from being lifted up in the discharging step. (B) Since the detector is submerged only at the time of distance measurement, the adhesion of dirt to the detector can be kept low, and the processing cycle can be continued for a long time without maintenance work. (C) Even when the distance detector is repeatedly moved up and down, the load on the connection cable of the detector can be reduced with a simple mechanism, so that the reliability of the processing system can be maintained high. (D) Since a highly reliable treatment cycle without sludge rolling can be realized, it is expected that the batch activated sludge method will contribute to automatic operation. (E) The distance detector is moved up and down integrally with the water collecting device, and the control is simple because an independent driving device is not required.
It can be easily added to existing treated water discharge systems.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of one embodiment of the present invention.

FIG. 2 is an explanatory view of a water collecting device of the present invention.

FIG. 3 is a cross-sectional view of a conventional treated water discharge device.

FIG. 4 is a plan view of a conventional treated water discharge device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Batch type water treatment tank 2 ... Water surface 3 ... Support arm member 4 ... Float 5 ... Winding drum 6 ... Control device 7 ... Connection cable 7a ... Wire 8 ... Distance detector 9 ... Protective cover 10 ... Water collecting hole 11 ... T-shaped joint 13 ... treated water 14 ... treated water discharge pipe 15 ... movable drainage pipe device 15a ... telescopic drainage pipe device 16 ... settling sludge 19 ... water collecting device 19a ... water collecting weir device 20 ... water collecting hole 21 ... water collecting pipe 22 … Lateral member 23… pin 26… upper drain pipe 27… lower drain pipe 29… flange 40… fixed pivot device 40 a… pin 45… swivel fitting 46… pulling device 48… pulling mechanism 48 a… support beam 48 b… support frame 48 c ... bearings 49 ... cylinders 52 ... brackets 53, 54 ... locking pins

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tsutomu Kashimura 3-1-16-1006, Yatsu, Narashino-shi, Chiba (72) Inventor Makoto Yamaguchi 9-13, Tsunobe, Daito-shi, Osaka (56) References JP-A-3 −174202 (JP, A) Hikaru 2-86696 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) C02F 3/12

Claims (6)

(57) [Claims] 1. A water collecting device having a water collecting hole communicating with a treated water discharge pipe fixed to a batch type water treatment tank via a movable drain pipe device and a float around the water collecting hole, wherein the water collecting device responds to a pull-up signal. A lifting device for lifting the water collecting device to a position higher than the high water level of the treatment tank, a distance detector attached downward to the water collecting device, and a residual device connected to the lifting device and the distance detector and remaining A control device having a required water amount set is provided, and the distance from the water surface to the top of the settled sludge is detected by the distance detector at the time of landing on the water surface of the treatment tank of the water collecting device by releasing the lifting signal, The distance to the top of the sludge and the amount of residual water required by the controller
DOO calculated drainable water on the basis of to and the discharge water volume the pulling output to become batch water treatment tanks of the processing drainer pulling signal to the device to the discharge end of the. 2. The treated water discharge device according to claim 1, wherein the control device calculates a scheduled discharge time of the dischargeable water amount based on the dischargeable water amount and a flow rate of water collected by the water collecting device, and calculates the scheduled discharge time. Discharge of treated water from a batch type water treatment tank by outputting a withdrawal signal to the withdrawal device when the time elapses
Equipment . 3. The treated water discharging device according to claim 1 , further comprising: a pressing device for applying a downward force to the water collecting device in response to a pressing signal from the control device. A treated water discharging device for a batch type water treatment tank, wherein a collecting flow rate of the device is increased by applying the downward force against the buoyancy of the float, and the controlling device adjusts a collecting flow rate of the water collecting device . Wherein any of the treated water discharge device to <br/> Oite of claims 1 to 3, winding drum provided above the water collecting device,
A wire stretched between the drum and the water collecting device,
And a connection cable that is gently stretched between the drum and the distance detector, the drum-side end of the cable is connected to the control device, and the wire and the cable are wound on the drum. Treated water discharge device for batch type water treatment tank. 5. <br/> Oite in any of the treated water discharge device according to claim 1 to 4, the exhaust pipe through the wall of the processing tank to the treated water discharge pipe in the underwater of the treatment bath A treated water discharge device for a batch-type water treatment tank serving as a drainage device having an upper end communicating the movable drainage device with the water collecting hole from below and a lower end connected to the discharge tube by a swivel pipe joint. 6. <br/> Oite in any of the treated water discharge device according to claim 5, the support for one end pivot pin which is fixed at a higher position than the high water level in the treatment tank is pivotally supported An arm member, holding the water collecting device at a free end of the support arm member, and rotating the support arm member around the pivot pin by the lifting device. Discharge device .