JP2014025235A - Septic tank drainage treatment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a septic tank drainage treatment system capable of curbing a running cost by reducing operating time of a pump device when treating drainage discharged from a septic tank.SOLUTION: A pump tank 20 has a pump device 25 and a water level detection device 27 provided with liquid surface detection units 27A and 27B arranged at different heights from each other. When a water level inside the pump tank 20 increases and reaches the liquid surface detection unit 27A at a high water level side, the pump device is turned from a non-drive state to a drive state. When the liquid surface detection unit 27B at a low water level side detects that the water level reaches the same, the pump device 25 is turned from the drive state to the non-drive state.

Description

  The present invention relates to a septic tank wastewater treatment system for discharging wastewater discharged from a septic tank to a discharge destination.

  Conventionally, in areas where public sewerage facilities are not in place, wastewater from ordinary households is purified using a septic tank and discharged into drainage facilities such as gutters and rivers. Here, when the bottom height of the drainage pipe of the septic tank is sufficiently higher than the water level of the discharge destination, the drainage of the septic tank can be allowed to flow naturally toward the discharge destination, Depending on conditions such as a long distance to the discharge destination, the septic tank drainage may not be allowed to flow naturally to the discharge destination. Therefore, where there is a case where the septic tank drainage cannot be allowed to flow naturally to the discharge destination, a configuration has been proposed in which the septic tank drainage is forcibly sent to the discharge destination using a pump (for example, a patent) References 1 and 2).

  In the configuration disclosed in Patent Document 1, the pump tank is detachably supported on the outside of the septic tank body, spaced from the upper surface of the floor board on which the septic tank body is installed.

  The configuration disclosed in Patent Document 2 is provided with a vent valve that switches between opening and closing when the submersible pump is operating and stopped at a height that does not immerse in the liquid in the tank of the liquid feeding pipe that passes through the upper part of the outer tank of the pump tank. ing.

JP 2002-248484 A JP 2003-65279 A

  However, the conventional configurations so far have the following problems. That is, when the septic tank and the discharge destination are constructed at the same height, the pump must always be driven because it may not be allowed to flow down naturally to the discharge destination. However, since the water level at the discharge destination changes, the water level at the discharge destination may be higher or lower than the bottom of the drainage pipe of the septic tank. The water level at the discharge destination is lower than the bottom of the pipe. In such a case, natural flow is possible, and in practice, it is not necessary to drive the pump. For this reason, the conventional configuration has the problem that the operating time of the pump becomes unnecessarily long and the running cost increases. On the other hand, the configuration in which the water level at the discharge destination is constantly monitored to control ON / OFF of the pump is complicated and the monitoring burden is too large.

  Therefore, an object of the present invention is to provide a septic tank wastewater treatment system including a pump device, which can reduce the running cost of the pump device with a simple configuration.

  The present invention is a septic tank wastewater treatment system for discharging wastewater discharged from a septic tank to a discharge destination, comprising a pump tank into which wastewater discharged from the septic tank flows, and further draining water flowing into the pump tank. In the drainage path connecting the pump tank and the discharge destination for discharging to the discharge destination, backflow prevention means for preventing the drainage from flowing back into the pump tank from the downstream side of the drainage path is provided. The pump tank has a pump device that can selectively change the state between a driving state in which the wastewater that has flowed into the pump tank is discharged to the discharge destination and a non-driving state in which the drainage is not discharged, And a water level detection means having a pair of liquid level detection units arranged at different heights, the water level detection means rising the water level in the pump tank and causing the water level to be at a high level. Reached the liquid level detector on the side And detecting that the water level in the pump tank has fallen and the water level has reached the low level liquid level detection unit, and the water level detection means is on the high level side when the pump device is in a non-driven state. When it is detected that the water level has reached the liquid level detection unit, the pump device is in a driving state. On the other hand, when the pump device is in a driving state, the water level detection means reaches the low level liquid level detection unit. When this is detected, the septic tank wastewater treatment system is characterized in that the pump device is brought into a non-driven state.

  In such a configuration, when the rainfall level increases and the water level at the discharge destination rises and the water level at the discharge destination becomes higher than that of the septic tank or the pump tank, the water at the discharge destination flows back toward the septic tank via the drainage path. However, this can be appropriately prevented by the backflow prevention means provided in the drainage path. Here, in a state where the backflow prevention means prevents backflow, the wastewater cannot be allowed to flow naturally toward the discharge destination through the drainage path, but the wastewater is continuously discharged from the septic tank. Can be appropriately drained by the pump device of the pump tank. In addition, in the present invention, since the water level detection means including the liquid level detection units having different set height positions from each other is provided in the pump tank, the warning that the water level in the pump tank is set to the high level side, for example, When the water level is reached, the pump device is driven. On the other hand, when the safe water level is set to the low level side, the pump device can be stopped. And when this pump apparatus is a non-driving state which stopped, drainage can be made to flow naturally through the drainage channel according to the water level of a discharge destination. As described above, the present invention is configured such that when the water level at the discharge destination is low, the pump device can be stopped and allowed to flow down naturally to the discharge destination, so that the pump device can be prevented from operating unnecessarily for a long time. The running cost of the pump device can be appropriately suppressed.

  The drainage from the septic tank flows into the pump tank via an inflow pipe connected to the pump tank, and the liquid level detection unit on the high level side in the water level detection means is the pump tank. It is preferable to arrange at the height of the top of the inflow pipe arranged on the inner peripheral wall.

  By adopting such a configuration, a situation in which the water level is higher than the top of the inflow pipe can be avoided as much as possible, so that the treated water in the septic tank is not retained.

  Further, the waste water from the septic tank flows into the pump tank via an inflow pipe connected to the pump tank, and the liquid level detection unit on the low level side in the water level detection means includes the pump tank It is preferable to arrange at the height of the pipe bottom of the inflow pipe arranged on the inner peripheral wall.

  Thus, by setting the height of the liquid level detection part on the low level side to the height of the bottom of the inflow pipe, the water level in the pump tank descends to the bottom of the inflow pipe, and the septic tank The pump device can be stopped when the situation where there is no concern about backflow into the pump is possible. For this reason, when the water level of a discharge destination is low, it becomes unnecessary to operate this pump apparatus wastefully, and the operating time of this pump apparatus can be shortened significantly.

  Since the septic tank wastewater treatment system of the present invention can shorten the operation time of the pump device, there is an effect that the running cost of the pump device can be significantly suppressed while the septic tank wastewater can be appropriately treated.

Explanatory drawing which shows the outline | summary of a septic tank wastewater treatment system. Explanatory drawing which shows the flow of the discharge in the septic tank wastewater treatment system at the normal time. Explanatory drawing which shows the outline | summary of the septic tank waste_water | drain processing system at the time of backflow prevention. Explanatory drawing which shows the water level state in a pump tank. The time chart figure in a septic tank wastewater treatment system. Explanatory drawing which shows the modification of a backflow prevention means.

  Hereinafter, the Example which actualized the septic tank waste_water | drain processing system 1 of this invention is described in detail.

  As shown in FIG. 1, the septic tank wastewater treatment system 1 includes a pump tank 20 into which wastewater discharged from the septic tank 10 flows. Specifically, drainage flows into the pump tank 20 via an inflow pipe 11 having one end connected to the septic tank 10 and the other end connected to the pump tank 20.

  Further, on the downstream side of the pump tank 20, a drainage path 22 that connects the pump tank 20 and the side groove 30 that is a discharge destination is formed. That is, the waste water that has flowed into the pump tank 20 can naturally flow down to the side groove 30 via the drain passage 22.

  Further, the drainage passage 22 is constituted by an outflow pipe 21, and a backflow prevention device 40 as a backflow prevention means is provided at an intermediate portion of the outflow pipe 21. The backflow prevention unit 40 includes a main body 41 into which waste water that has flowed down naturally from the pump tank 20 flows, and a backflow prevention device 42 that prevents backflow from the downstream side is disposed in the main body 41. Yes. Specifically, the backflow prevention device 42 is provided with an open / close lid 43 as a valve body so as to be rotatable in the vertical direction. The open / close lid 43 opens and closes according to the direction of the water flow, so that the inside of the main body 41 and the side groove 30 on the downstream side are opened, or the inside of the main body 41 and the side groove 30 are opened. And the state is changed to a closed state that prevents the drainage from flowing back into the pump tank 20.

  As shown in FIG. 2, the drainage discharged from the septic tank 10 flows into the pump tank 20 through the inflow pipe 11 and is in the pump tank 20 at a normal time when the water level of the side groove 30 is low. The drainage flows into the backflow prevention 40 through the outflow pipe 21. Then, the drainage in the backflow prevention 40 lifts the opening / closing lid 43 and flows further downstream, and is discharged into the side groove 30. In FIG. 2, the drainage in the septic tank wastewater treatment system 1 is omitted as appropriate.

  On the other hand, as shown in FIG. 3, when the water level in the side groove 30 rises during the water increase, the water in the side groove 30 flows backward toward the upstream side of the drainage path 22 through the outflow pipe 21. The opening / closing lid 43 of the backflow prevention 40 is closed, and backflow to the upstream side is prevented. In FIG. 3, the drainage of the pump tank 20 and the like is omitted as appropriate.

  Incidentally, as shown in FIG. 3, when the backflow prevention device 42 is in the backflow prevention state, the open / close lid 43 is in a closed state, so that it is impossible to let the drainage flow down from the pump tank 20 to the downstream side. . Therefore, the septic tank wastewater treatment system 1 is provided with a mechanism that can discharge wastewater from the pump tank 20 to the downstream side even when the backflow prevention device 42 is in the backflow prevention state.

  As shown in FIG. 1 and the like, the pump tank 20 is provided with a pump device 25. The pump device 25 has a suction port (not shown) arranged near the bottom in the pump tank 20 and a pressure feeding pipe 26 that directly pumps the waste water sucked from the suction port to the side groove 30. The pump device 25 is controlled to be turned on and off, so that the wastewater that has flowed into the pump tank 20 is discharged into the side groove 30 via the pressure feeding pipe 26 and the non-discharged state. The state is selectively converted to the driving state. In addition, when the pump device 25 is in a non-driven state, the power consumption of the pump device 25 is reduced compared to when the pump device 25 is in a driven state.

  Further, a water level detection device 27 including a pair of liquid level detection units 27A and 27B arranged at different heights is provided on the peripheral wall in the pump tank 20. Specifically, the liquid level detection unit 27A on the high level side of the water level detection device 27 is placed on the peripheral wall of the pump tank 20 so that it is at the same height as the top of the inflow pipe 11 in the pump tank 20. The low level liquid level detection unit 27 </ b> B is disposed on the peripheral wall of the pump tank 20 so as to be at the same height as the bottom of the inflow pipe 11. The water level detection device 27 constitutes a water level detection means according to the present invention.

  And the said pump apparatus 25 and the said water level detection apparatus 27 are connected so that transmission / reception of an electrical signal is possible, and this water level detection apparatus 27 raises the water level in this pump tank 20, and detects the liquid level of a high level side. When it is detected that the unit 27 </ b> A has been reached, a detection signal notifying this is transmitted to the pump device 25. On the other hand, when the water level detection device 27 detects that the water level in the pump tank 20 has fallen to reach the liquid level detection unit 27B on the low level side, the detection signal is transmitted to the pump device 25. .

  When the pump device 25 receives a detection signal notifying that the water level has reached the high level liquid level detection unit 27A in the non-driving state, the pump device 25 switches to the driving state, and on the other hand, the low level in the driving state. When a detection signal for notifying that the water level has reached the liquid level detection unit 27B on the side is received, the control content for switching to the non-driven state is provided.

  As the liquid level detectors 27A and 27B, a known liquid level sensor can be suitably used. The pump device 25 having the above control content can be suitably configured by a control circuit using, for example, a central processing unit (CPU). However, the configurations of the liquid level detection units 27A and 27B and the pump device 25 are not limited to these.

  In the septic tank wastewater treatment system 1 described above, when the backflow prevention device 42 is in the backflow prevention state (see FIG. 3), the open / close lid 43 is in the closed state. Is discharged, the water level in the pump tank 20 gradually rises accordingly. Then, as shown in FIG. 4a, when the raised water level reaches the high level liquid level detection unit 27A, the liquid level detection unit 27A detects this, and as shown in FIG. From the non-driving state (OFF state) to the driving state (ON state). And the wastewater in this pump tank 20 begins to be forcibly discharged to the side groove 30 via the pressure feed pipe 26, and the wastewater in this pump tank 20 is started appropriately.

  When the pump device 25 is driven, the water level in the pump tank 20 is lowered, and when the lowered water level reaches the low level liquid level detection unit 27B as shown in FIG. 4b, the liquid level detection unit 27B is This is detected, and as shown in FIG. 5, the pump device 25 changes from the drive state (ON state) to the non-drive state (OFF state). Thereby, the forced discharge to the side groove 30 via the pressure feeding pipe 26 is stopped.

  When the water level in the pump tank 20 rises again and the water level reaches the high level liquid level detection unit 27A, the pump device 25 is changed from the non-driven state to the driven state again. Thus, according to the water level fluctuation in the pump tank 20, the pump device 25 changes its state to a driving state or a non-driving state.

  On the other hand, when the water level in the side groove 30 is low and the open / close lid 43 of the backflow prevention device 42 is open, the water in the pump tank 20 naturally flows toward the side groove 30. In addition, since the pipe diameter of the outflow pipe 21 is set to a thickness that allows the drainage to flow sufficiently naturally based on the normal drainage amount per unit time discharged from the septic tank 10, the backflow prevention is performed as described above. When the open / close lid 43 of the device 42 is in the open state, the water level in the pump tank 20 does not reach the liquid level detector 27A on the high level side.

  Since the septic tank wastewater treatment system 1 can perform drainage control of the septic tank 10 based on only the water level status in the pump tank 20 without measuring the water level in the side groove 30, the management of the entire system is simple. There is an advantage that

The present invention is not limited to the above-described embodiments, and can be appropriately changed in design without departing from the gist of the present invention.
For example, instead of the backflow prevention device 40 as a backflow prevention means, a known backflow prevention valve 50 attached to the outlet of the outflow pipe 21 in the pump tank 20 may be employed as shown in FIG. In such a configuration, it is possible to appropriately take a backflow prevention measure even in a narrow area where it is impossible to install more and more.

  Moreover, as a discharge destination, it is not limited to the side groove 30, A waterway or a river may be sufficient.

  Further, it is of course possible to provide an appropriate gradient when constructing the piping so that the natural flow toward the side groove 30 can be smoothly performed.

1 Septic tank drainage treatment system 10 Septic tank 20 Pump tank 22 Drainage path 25 Pump device 27 Water level detection device (water level detection means)
27A, 27B Liquid level detection part 30 Side groove (discharge destination)
40 Backflow prevention (backflow prevention means)
50 Backflow prevention valve (backflow prevention means)

Claims (3)

A septic tank wastewater treatment system for discharging wastewater discharged from a septic tank to a discharge destination,
It has a pump tank into which waste water discharged from the septic tank flows,
Further, the wastewater flows back into the pump tank from the downstream side of the drainage path to the drainage path connecting the pump tank and the discharge destination for discharging the wastewater flowing into the pump tank to the discharge destination. Backflow prevention means is provided to prevent
In the pump tank,
A pump device capable of selectively changing the state between a driving state in which the wastewater flowing into the pump tank is discharged to the discharge destination and a non-driving state in which the wastewater is not discharged;
A water level detection means having a pair of liquid level detection units disposed at different heights in the pump tank;
Is provided,
The water level detection means
The water level in the pump tank rises and the water level reaches the high level liquid level detector, and the water level in the pump tank drops and the water level reaches the low level liquid level detector. Detecting that,
When the water level detection means detects that the water level has reached the high level liquid level detection unit when the pump device is in the non-driven state, the pump device is in the driven state, while the pump device is in the driven state. When the water level detecting means detects that the water level has reached the low-level liquid level detecting unit, the septic tank wastewater treatment system is characterized in that the pump device is not driven. Through the inflow pipe connected to the pump tank, the drainage from the septic tank flows into the pump tank,
2. The septic tank wastewater treatment system according to claim 1, wherein the high-level liquid level detection unit in the water level detection unit is disposed at a height of a top of the inflow pipe disposed on a peripheral wall in the pump tank. Through the inflow pipe connected to the pump tank, the drainage from the septic tank flows into the pump tank,
3. The septic tank according to claim 1, wherein the liquid level detection unit on the low level side in the water level detection means is disposed at the height of the bottom of the inflow pipe disposed on the peripheral wall in the pump tank. Wastewater treatment system.

Images