JPH10151483A - Purifying tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely adjust a treatment flow rate of treated water without hindrance. SOLUTION: This purifying tank is constituted so that a membrane separator 5 is provided within an aeration tank 4 aerobically and biologically treating water to be treated with activated sludge so as to be immersed in the water to be treated and a treated water storage tank 6 is provided so as to communicate with the aeration tank through the treated water piping 9 connected to the membrane separator and, further, the treated water storage tank communicates with a disinfection tank 8 through a discharge pipe 15 having a discharge pump 12 provided on the way thereof. In this case, a water level detection means 19 is provided to the treated water storage tank and a control part 10 controlling the operation of the discharge pump so as to realize the predetermined water head difference related to the aeration tank and the treated water storage tank on the basis of the water level detected by the water level detection means is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a septic tank. More specifically, the present invention relates to a purification tank in which a membrane separation device separates water to be treated into solid and liquid by using a head difference between an aeration tank and a treated water storage tank as a driving source and sends the treated water to the treated water storage tank. The present invention relates to a septic tank capable of surely adjusting a processing flow rate without any trouble.

[0002]

2. Description of the Related Art Conventionally, night soil, daily cooking, washing,
BACKGROUND ART Septic tanks capable of purifying household wastewater generated by bathing and the like have been provided. As one of the septic tanks, for example, there is a membrane separation type septic tank shown in FIG. As shown in FIG. 3, the membrane separation type septic tank is provided with a membrane separation device (5) in an aeration tank (4) for aerobically biologically treating the water to be treated with activated sludge. The interior is immersed in treated water. The membrane separation device (5) is for solid-liquid separation of the water to be treated in the aeration tank (4), and the driving source for the separation is a head between the aeration tank (4) and the treated water storage tank (6). Use the difference. In this solid-liquid separation, the membrane separation device (5) holds the activated sludge in the aeration tank (4) while treating the filtered membrane permeate as treated water into the aeration tank (4) through the treated water pipe (9). The water is sent to the treated water storage tank (6).

[0003] The treated water is then pumped up from a treated water storage tank (6) by a discharge pump (12), sent to a disinfection tank (8) through a discharge pipe (15), and then discharged outside the tank. In such a membrane type septic tank, a sedimentation separation tank (1) and an anaerobic filter bed tank (2) are provided on the drainage inflow side, and after treatment, treated water is transferred to a transfer pump (3).
To the aeration tank (4). Reference numeral 14 denotes a sludge transfer pipe that forms a transfer passage for sludge.

The aeration tank (4) further includes a diffuser (7)
Is provided, and the air sent from the blower (16) connected thereto is sent to the aeration tank (4) through the air diffuser (7) so that an aerobic state is formed. . In the aeration tank (4), activated sludge treatment of the water to be treated is performed in an aerobic state. In the septic tank, the water levels of the sedimentation separation tank (1), the anaerobic filter bed tank (2) and the aeration tank (4) are determined by water level detection means provided in each of the anaerobic filter tank (2) and the aeration tank (4). (11) The operation of the transfer pump (3) is controlled by the control unit (10) according to the detected water level detected by the control unit (13). The control unit (10) includes, as a reference for operation control of the transfer pump (3), each tank (1) (2)
The upper and lower water levels (L1) and (L2) in (4) are set.

[0005]

As shown in FIG. 3, for example, the conventional septic tank of the membrane separation type, as shown in FIG. Since the driving source for transfer to the treated water storage tank (6) is obtained from the head difference between the aeration tank (4) and the treated water storage tank (6), a driving means such as a pump is unnecessary, and the structure is simplified. And has the advantage of being able to contribute to cost reduction. On the other hand, the solid-liquid separation of the water to be treated and the transfer of the treated water are performed in the aeration tank (4) and the treated water storage tank (6). Between head differences. When the head difference is large, a large driving force is obtained, but when the difference is small, the driving force decreases. Therefore, when adjusting the treatment flow rate of the treated water, the adjustment can be realized by controlling the head difference between the aeration tank (4) and the treated water storage tank (6).

Japanese Unexamined Patent Publication No. Hei 6-218237 discloses, as one of the measures, an overflow pipe having a water collecting port capable of moving up and down in a membrane separation tank, and adjusting the water level in the membrane separation tank according to the position of the water collecting port. Is disclosed. However, since the water to be treated in the membrane separation tank, that is, the aeration tank (4) is activated sludge having a high concentration, the overflow pipe is liable to be clogged, and there is a problem that it is difficult to reliably control the water level.

SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances described above, and has been made to solve the problem of adjusting the flow rate of treated water in a conventional septic tank, and to surely adjust the treated flow rate of treated water without hindrance. It aims to provide a septic tank that can be used.

[0008]

The present invention solves the above-mentioned problems by providing an aeration tank for aerobically biologically treating water to be treated with activated sludge, and a membrane separation device for treating water to be treated. A treated water storage tank is provided in communication with the aeration tank through a treated water pipe connected to the membrane separation device, and the treated water storage tank is provided with a discharge pump in the middle of the pipeline. The membrane separation device communicates with the disinfection tank via a discharge pipe, and the membrane separation device performs solid-liquid separation of the water to be treated using the head difference between the aeration tank and the treated water storage tank as a driving source, and transfers the treated water to the treated water storage tank. On the other hand, the activated sludge is held in the aeration tank, and in the purification tank, a water level detecting means is provided in the treated water storage tank. Based on the water level detection by the water level detecting means, predetermined settings for the aeration tank and the treated water storage tank are set. Operation of the discharge pump so that a head difference is realized To provide a septic tank, characterized in that the control unit that controls are provided (claim 1).

According to the present invention, a membrane separation device is provided in an aeration tank for aerobically biologically treating the water to be treated with activated sludge so as to be immersed in the water to be treated, and is connected to the membrane separation device. A treated water storage tank is provided in communication with the aeration tank via a treated water pipe, and the treated water storage tank is further connected to a disinfection tank through a discharge pipe provided in the middle of the pipe, and the membrane separation is performed. The apparatus separates the water to be treated into solid and liquid by using the head difference between the aeration tank and the treated water storage tank as a driving source and sends the treated water to the treated water storage tank, while the activated sludge is held in the aeration tank in a purification tank. Flow rate detecting means is provided in the middle of the treated water pipe,
A purifying tank provided with a control unit for controlling the operation of the discharge pump so that a predetermined set flow rate is realized based on the detection of the processing flow rate by the flow rate detection means. (Claim 2).

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the septic tank of the present invention will be described in more detail with reference to the accompanying drawings and embodiments.

[0011]

FIG. 1 is a block diagram showing one embodiment of a septic tank according to the present invention. For example, in the example shown in FIG. 1, some improvements are added while following the conventional septic tank shown in FIG. That is, a water level detecting means (19) is provided in the treated water storage tank (6). Control unit (1
0) controls the operation of the discharge pump (12) based on the water level detection detected by the water level detection means (19). A predetermined head difference is preset in the control unit (10) for the aeration tank (4) and the treated water storage tank (6), and the operation of the discharge pump (12) is performed so that the set head difference is realized. Control. The head difference set in the control unit (10) is based on the premise that the water level in the treated water storage tank (6) is lower than the water level in the aeration tank (4).

That is, in the example shown in FIG. 1, by controlling the water level of the treated water storage tank (6), the head difference between the aeration tank (4) and the treated water storage tank (6) is controlled. The processing flow rate of the treated water is adjusted. Unlike the case of the control using the overflow pipe described above, the target of the water level control is the treated water in the treated water storage tank (6), and this treated water is treated after being treated by the membrane separation device (5). The water quality is good and no clogging problem occurs. The processing flow rate of the treated water is adjusted without any trouble.

In addition, in such a septic tank, a valve (17) and a throttle (18) are connected in parallel to a treated water pipe (9),
The treated water after passing through the membrane separation device (5) can be transferred to the treated water storage tank (6) via the treated water piping (9) through the treated water pipe (9) when the valve (17) is open. The aperture (18)
This is provided to control the flow of the treated water, and for example, a fixed throttle is preferably applied. As for the valve (17), a type in which the opening and closing of a motor-operated valve or the like is automatically controlled can be adopted. In this case, the opening and closing control of the valve (17) can be performed by the control unit (10).

The treated water pipe (9) may be provided with a flow rate detecting means (20) in the middle of the pipe. The flow rate detecting means (20) detects a flow rate of the treated water flowing through the treated water pipe (9), and detects a set flow rate preset in the control unit (10). In some cases, the flow rate detection by the flow rate detection means (20) can be fed back to the control of the processing flow rate. That is, a predetermined processing flow rate is set in the control unit (10) in advance, and the operation of the discharge pump (12) is controlled so as to realize this. By using it together with the flow rate control by the water level detecting means (19), it is possible to more accurately adjust the processing flow rate.

Furthermore, a valve (1) is connected to the treated water pipe (9).
Similar to 7) and the throttle (18), an auxiliary pump (21) can be connected in parallel. This auxiliary pump (21)
Is provided to secure a set flow rate set in advance in the control unit (10), and a structure is adopted in which the treated water does not flow backward during stoppage. In a septic tank in which the driving source of the membrane separation device (5) is the head difference between the aeration tank (4) and the treated water storage tank (6), for example, during construction, when cleaning the membrane separation device (5), etc. Means that air enters the treated water pipe (9) and the treated water hardly flows or stops flowing,
In such a case, the control unit (10) temporarily activates the auxiliary pump (21) to perform the priming operation and secure the set processing flow rate. Whether or not the flow rate of the treated water flowing through the treated water pipe (9) has reached the set treatment flow rate can be confirmed by the flow rate detecting means (20) provided in the middle of the treated water pipe (9). it can. This flow detecting means (2
After 0) detects the set processing flow rate, the control unit (10)
Stops the auxiliary pump (21).

For example, for the septic tank shown in FIG. 1 having the above configuration, the operation of the membrane processing apparatus (5) can be described as follows. The auxiliary pump (21) is operated, the water to be treated in the aeration tank (4) is sucked, and the priming operation is performed until the treated water flow rate detecting means (20) detects the set treatment flow rate. After detecting the set processing flow rate, the auxiliary pump (21) stops.

The discharge pump (12) operates to set the water level in the treated water storage tank (6) to a predetermined water level. This water level
It can be set in the control unit (10) in advance. The operation of the discharge pump (12) is controlled so that the valve (17) is opened and the water level in the treated water storage tank (6) is monitored by the water level detection means (19) so that the set head difference is realized. You. At this time, the flow rate of the treated water can be monitored by the flow rate detecting means (20), and the operation of the discharge pump (12) can be controlled so that the set treated flow rate is realized.

When the suction of the water to be treated is stopped, the valve (1
9) is closed and the auxiliary pump (21) is stopped. FIG.
FIG. 2 is a configuration diagram showing another example of the septic tank of the present invention.
In the example shown in FIG. 2, instead of controlling the head difference between the aeration tank (4) and the treated water storage tank (6), the flow rate of treated water flowing through the treated water pipe (9) is directly controlled. Thus, the processing flow rate is adjusted. For this purpose, a flow rate detection means (20) is provided in the middle of the treated water pipe (9), and a predetermined treatment flow rate is set in the control unit (10).

The water level detecting means (19) employed in the example of FIG. 1 is omitted. And the control unit (10)
Controls the operation of the discharge pump (12) based on the flow rate detection by the flow rate detection means (20). Discharge pump (1
When 2) operates, the treated water in the treated water storage tank (6)
It is transferred to the disinfection tank (8) via the discharge pipe (15).
As a result, the water level in the treated water storage tank (6) decreases, and the head difference from the aeration tank (4) increases. According to the head difference at this time, the water to be treated moves from the aeration tank (4) toward the treated water storage tank (6), and the solid-liquid separation of the treated water and the transfer of the treated water by the membrane separation device (5). Is performed, the flow rate of the treated water is also adjusted by the flow rate detection by the flow rate detection means (20).

Also in the case of the example shown in FIG. 2, similarly to the example shown in FIG. 1, the auxiliary pump (21) together with the valve (17) and the throttle (18) are connected in parallel to the treated water pipe (9). Can be connected. For example, with respect to the septic tank having the above-described configuration and shown in FIG. 2, the operation of the membrane processing apparatus (5) can be described below.

[0021] The auxiliary pump (21) operates to suck the water to be treated in the aeration tank (4), and performs a priming operation until the flow rate detecting means (20) detects the set processing flow rate. After detecting the set processing flow rate, the auxiliary pump (21) stops. The operation of the discharge pump (12) is controlled such that the set processing flow rate is realized while the valve (17) is opened and the monitoring of the processing flow rate is continued by the flow rate detection means (20).

Of course, the present invention is not limited by the above examples. It goes without saying that various aspects are possible for details such as the configuration and structure of the water level detecting means and the flow rate detecting means.

[0023]

As described above in detail, according to the present invention, the membrane separation apparatus separates the water to be treated into solid and liquid by using the head difference between the aeration tank and the treated water storage tank as a driving source, and transfers the treated water to the treated water storage tank. In the septic tank to be sent, the treatment flow rate of the treated water can be surely adjusted without any trouble.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a septic tank according to the present invention.

FIG. 2 is a configuration diagram showing another example of the septic tank of the present invention.

FIG. 3 is a configuration diagram showing a conventional membrane separation type septic tank.

[Explanation of symbols]

 Reference Signs List 1 sedimentation separation tank 2 anaerobic filter bed tank 3 transfer pump 4 aeration tank 5 membrane separation device 6 treated water storage tank 7 diffuser tube 8 disinfection tank 9 treated water pipe 10 control unit 11, 13, 19 water level detecting means 12 discharge pump 14 transfer Pipe 15 Discharge pipe 16 Blower 17 Valve 18 Restrictor 20 Flow rate detecting means 21 Auxiliary pump

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takayoshi Nakaoka 1048 Odakadoma, Kadoma City, Osaka Matsushita Electric Works, Ltd.

Claims (2)

[Claims] 1. An aeration tank for aerobically biologically treating water to be treated with activated sludge, in which a membrane separation device is installed so as to be immersed in the water to be treated, and a treated water pipe connected to the membrane separation device. The treated water storage tank is provided in communication with the aeration tank via, and the treated water storage tank further communicates with the disinfection tank via a discharge pipe provided in the middle of a discharge pump, and the membrane separation device includes: Using the head difference between the aeration tank and the treated water storage tank as a drive source, the water to be treated is separated into solid and liquid, and the treated water is sent to the treated water storage tank, while the activated sludge is stored in the purification tank held in the aeration tank. A tank is provided with a water level detecting means, and based on the water level detection by the water level detecting means, control for controlling the operation of the discharge pump such that a predetermined set head difference between the aeration tank and the treated water storage tank is realized. A septic tank provided with a part. 2. An aeration tank for aerobically biologically treating the water to be treated with activated sludge, in which a membrane separation device is provided so as to be immersed in the water to be treated, and a treated water pipe connected to the membrane separation device. The treated water storage tank is provided in communication with the aeration tank via, and the treated water storage tank further communicates with the disinfection tank via a discharge pipe provided in the middle of a discharge pump, and the membrane separation device includes: The water to be treated is separated into solid and liquid by using the head difference between the aeration tank and the treated water storage tank as a drive source, and the treated water is sent to the treated water storage tank. A flow rate detecting means is provided in the middle of the pipeline, and a control unit for controlling the operation of the discharge pump is provided based on the detection of the processing flow rate by the flow rate detecting means so that a predetermined set flow rate is realized. A septic tank characterized by being.