JPS6310876Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a domestic sewage septic tank.

Conventionally, septic tanks were aerated regardless of the amount of sewage flowing into them. However, carrying out aeration even when there is no inflow of sewage leads to overaeration, which changes the water quality, and has the drawback of increasing operating costs in view of the recent rise in electricity rates.

This idea was made to eliminate the above-mentioned drawbacks, and aeration is carried out after a predetermined period of time has elapsed since the inflow of sewage was detected and when there is no inflow of sewage for a predetermined period of time, thereby preventing over-aeration. The purpose of the present invention is to provide a domestic sewage septic tank with low operating costs.

Hereinafter, embodiments of this invention will be described in detail with reference to FIGS. 1 to 3.

First, Figure 1 shows a septic tank to which this invention is applied. Reference numeral 1 denotes a septic tank body made of synthetic resin such as FRP, and has a sewage inlet 2 formed on the front side and an outlet 3 formed on the rear side. The inside of the septic tank main body 1 is partitioned into an aeration chamber 5 and a precipitation chamber 6 by a first separator 4. The aeration chamber 5 has an aerator 7a suspended by a hanger 7. This aerator 7a consists of a cylindrical drafter 9 attached to the hanger 7 via an attachment 8 and a runner 10 provided on the top of the drafter 9. The runner 10 is rotated by the rotation of a motor 11. By doing so, gas and liquid are mixed at the liquid level and scattered to the surrounding area, and a stirring flow as shown by the arrow is formed in the aeration chamber 5, resulting in aeration.
I do. Note that the aerator may be of a diffused type.

On the other hand, the precipitation chamber 6 is divided into a first precipitation chamber A and a second precipitation chamber B by a second separator 12. A disinfection chamber 14 is provided in the second precipitation chamber B to which the separated liquid is supplied via an overflow weir 13. A chemical cylinder 15 is installed in the disinfection chamber 14, and the separated liquid is discharged from the outlet 3 after being disinfected. A detection unit 16 is provided at the overflow weir 13 or at the liquid level of the disinfection chamber 14 to detect the inflow of waste water. This detection section 16
may be any detection electrode that generates some kind of electrical signal in response to a rise in liquid level or the arrival of a liquid component, for example. In other cases, when the septic tank is a single septic tank that only uses domestic fecal water, a switch may be provided on the flush valve and this may be used as the detection section 16.

A detection signal from the detection unit 16 is supplied to a control circuit (control device) 17. The control circuit 17 outputs a drive command signal to the drive circuit 18 after a predetermined time delay after the detection signal is sent. Drive circuit 1
8 connects the motor 11 to the power source and drives it for a certain period of time from this point. In the case of the diffuser type, the drive of the blower motor is controlled.

The drive circuit 18 can, for example, use a separately provided 24-hour cycle timer relay.
Sequences are created to enable various control modes to be described later.

Next, the operation of this invention will be explained according to the time charts shown in FIGS. 2 and 3.

First, FIG. 2 shows the basic operation of the control circuit 17. When the detection section 16 detects inflow water, its output is transmitted to the control circuit 17. Then, when the detection signal is sent and the Tx time elapses, the aerator is driven, and once it is activated, its output state is maintained for a certain period of time.
Sustain and then stop. If new sewage flows in before the time To has elapsed, the operation state will continue for a new To time after a delay of Tx time from the new inflow.

Next, FIGS. 3a to 3c show specific control modes, where a indicates the operation of the cycle timer, and b to
c shows four control modes corresponding to the operation.

Control mode [1] (Fig. 3b) operates the aerator 7a continuously when the cycle timer is ON, and intermittently when the cycle timer is OFF, that is, the operation (T _ON ) shown in Fig. 2 and at regular intervals. Drive.
In this case, if there is no inflow of sewage within a certain period of time (T _pff ), the system will automatically operate.

In control mode [2] (FIG. 3c), the aerator 7a is operated intermittently regardless of the cycle timer.

In each of the above figures, the arrow indicates the time when sewage flows in, and although the aerator 7a is shown to be driven in synchronization with this timing in the drawings, in reality it is as shown in Fig. 2. , the aerator is operated after a certain time delay.

As described above, in this invention, the aerator 7a is driven for a certain period of time even when there is no inflow of sewage within a certain period of time, so even if there is no inflow of sewage for a long period of time, sewage treatment can be carried out reliably. I can do it. By the way, in a household septic tank, the bottom of the aeration chamber and the bottom of the settling chamber are generally in communication, as shown in Figure 1, so when the aerator 7a is operated, the settling chamber is completely drained due to the influence of water flow or vibration. However, when the aerator 7a is stopped, a complete stationary state can be obtained. As a result, when the aerator 7a is stopped, the sludge is reliably separated by sedimentation. Therefore, in this idea, the second
As shown in the figure, we decided to detect the inflow of wastewater and drive the aerator at a timing delayed by the Tx time, so for a while after the inflow (until the water level in the tank reaches the normal water level). Since the aeration chamber 5 is also used as the settling chamber 6 to reduce the burden on the settling chamber 6, the discharge of sludge flocs can be prevented.

As described above, according to this invention, aeration is carried out after a predetermined period of time has elapsed from the time when the inflow of sewage is detected, and when there is no inflow of sewage for a predetermined period of time, thereby preventing overaeration and reducing operating costs. A sewage septic tank is obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an embodiment of this invention, and FIGS. 2 and 3 are time charts for explaining the operation of essential parts of the embodiment. 1... Septic tank body, 5... Aeration chamber, 6... Sedimentation chamber, 7a... Aerator, 11... Motor, 16
...Detection unit, 17...Control circuit (control device), 1
8...Drive circuit.

Claims (1)

[Scope of utility model registration request] A household septic tank that has an aeration chamber into which sewage intermittently flows in and a settling chamber that communicates with the aeration chamber has a detection unit that detects the inflow of sewage and generates a detection signal, and a detection unit that detects the inflow of sewage and generates a detection signal. The aerator that aerates, and the aerator is driven for a predetermined time after a predetermined time has passed after receiving the detection signal, and when the detection signal is not supplied within the predetermined time and the aerator is not driven for a predetermined time, A domestic sewage septic tank having an aeration chamber and a settling chamber communicating with the aeration chamber, characterized in that the household sewage septic tank is equipped with a control device for controlling the aerator so as to drive the aerator for a certain amount of time.