JPH083499Y2 - Sewer system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a sewage system for transporting and collecting sewage discharged from homes and the like using a pressure difference.

[Conventional technology]

In recent years, a so-called vacuum sewage system has been proposed in which a negative pressure is generated in a sewer pipe, and sewage is transported and collected using a pressure difference. This is shown in FIGS. 4 (a) and 4 (b).

The sewage system is used for households as shown in Fig. 4 (a).
Vacuum valve unit 20 that temporarily collects sewage discharged from 10 kitchens, bathrooms, toilets, etc., a vacuum sewage pipe 30 that conveys sewage from the vacuum valve unit 20 by a pressure difference, a vacuum sewage pipe 30 having a negative pressure source And a vacuum station 40 for temporarily collecting the sewage and temporarily storing the sewage.

In the vacuum valve unit 20, when the amount of sewage collected inside exceeds a predetermined amount, the valve body that closes the inlet to the vacuum sewage pipe 30 automatically opens, and the sewage is sucked into the vacuum sewage pipe 30. It is what makes me. Further, as shown in an enlarged view in FIG. 4 (b), the vacuum station 40 temporarily stores the sewage transported by the vacuum sewage pipe 30 and then sends it to a sewage treatment plant or the like. Negative pressure source 41 for sucking sewage
And a pressure pump 50 for delivering dirty water.

The negative pressure generation source 41 is an ejector pump and generates negative pressure by the following mechanism. That is, sewage sucked from the lower intake part 43 by the pump 42 is vigorously ejected from the upper discharge part 44, so that a pressure difference based on the Benchery effect is generated in the pressure reducing part 45 provided in the middle of the discharge path. , This is used to obtain negative pressure. Since the vacuum sewer pipe 30 is communicated with the depressurizing unit 45 which thus generates the negative pressure, the pump 42
The sewage is sucked by the operation of and is transported in the sewer pipe 30.
The waste water conveyed in the vacuum sewer pipe 30 is discharged from the discharge unit 44 to the storage unit 46 of the vacuum station 40.

Since the vacuum sewage system configured as above is forcibly transported by the pressure difference, it is possible to transport sewage with a certain degree of rising gradient, so it is less affected by the topography of the laying area, and the pipe diameter of the sewer pipe is reduced. It has a number of advantages that it can be made small and there is no risk of toxic gas or sewage leaking out due to the negative pressure inside the sewer pipe, and the construction cost is extremely low.

[Problems to be solved by the device]

Although the vacuum sewage system has many advantages, it is designed to temporarily store sewage in the vacuum station 40 and then deliver it to the sewage treatment plant. Therefore, in addition to the negative pressure generating pump 42, sewage delivery system A pressure pump 50 is required. Therefore, the equipment cost is high and the construction and maintenance are troublesome.

[Means for solving the problem]

The present invention is a sewage system devised in view of the above problems, and is characterized in that sewage stored in the tank is sucked into an anaerobic treatment tank for treating the sewage under anaerobic conditions. A pump provided with an intake part and a discharge part for discharging this sewage into the tank is provided, and a depressurization part having a Venturi effect is provided in the discharge path of the pump to configure an ejector and suction to the depressurization part. That is, a sewage pipe that forms a part and guides sewage to the anaerobic treatment tank is connected to the suction part of the pump.

[Action]

The sewage system according to the present invention employs an ejector type pump as a drive source for circulating or stirring the sewage stored in the anaerobic treatment tank, and conveys the sewage to the suction part that leads to the decompression section of the ejector type pump. The sewer is connected. When the sewage circulation and stirring process in the anaerobic treatment tank is executed based on such a configuration, a negative pressure is generated in the sewage pipe through the suction part due to the Venturi effect generated in the depressurization part, and the sewage is sucked into the sewage pipe. That is, the sewage is forcibly transported along with the execution of the anaerobic treatment.

〔Example〕

Hereinafter, details of the present invention will be described with reference to the drawings showing embodiments.

(First Embodiment) FIGS. 1 (a) and 1 (b) show a sewer system A according to the present invention.
The first embodiment of the present invention is shown. In the sewage system A, an anaerobic treatment tank 1 is provided with an ejector type pump 2 which is used for circulating sewage and is also a source of negative pressure. The ejector type pump 2 is a pump 2a having a wastewater intake part 2b and a wastewater discharge part 2c, and a depressurizing part 2e having a venturi effect is provided in the middle of the wastewater discharge path 2d to configure an ejector. The sewage pipe 3 which forms the suction part 2f leading to the decompression part 2e and guides the sewage into the treatment tank 1 is connected to the suction part 2f.
Connected to.

As shown in FIG. 3A, the waste water discharged from each home 10 is collected in the vacuum valve unit 20. Vacuum valve unit
As in the conventional case, 20 is set so that the vacuum valve is automatically opened when the amount of waste water reaches a predetermined amount.

When the ejector type pump 2 is operated to circulate the sewage water in the anaerobic treatment tank 1, the sewage water in the treatment tank 1 is sucked from the intake portion 2b by the pump 2a and is then vigorously ejected from the discharge portion 2c. At this time, a pressure difference based on the Venturi effect occurs in the pressure reducing section 2e provided in the discharge path 2d. As a result, a negative pressure is generated in the sewer pipe 3 connected to the suction unit 2f communicating with the depressurization unit 2c, and the waste water collected in the vacuum valve unit 20 is sucked and conveyed to the processing tank 1. The conveyed sewage merges with the sewage sucked from the intake section 2b by the pump 2a at the decompression section 2e, is ejected from the discharge section 2c, and circulates in the tank 1.

In order to maintain the anaerobic state of the sewage, it is desirable that the discharge port 2c of the ejector pump 2 be located below the water level of the sewage stored in the anaerobic treatment tank 1.
The sewage thus anaerobically treated is transferred to the subsequent treatment tank (not shown) through the advection pipe 4 and subjected to, for example, aerobic treatment.

The sewage system A described above is an alternative to the conventional vacuum station 40 (see FIG. 4), and the anaerobic treatment tank 1 has a temporary storage of waste water conveyed from the vacuum valve unit 20 and a first stage treatment of waste water. It has two functions.

The sewage system A according to the present invention can also be connected to the conventional vacuum station 40. In this case, the collection of sewage is done at the vacuum station 40 as before,
Transfer of sewage from the vacuum station 40 to the anaerobic treatment tank 1,
It can be performed by the ejector pump 2 installed in the anaerobic treatment tank 1. As a result, the pressure pump 50 for delivering dirty water, which is conventionally provided in the vacuum station 40, is omitted. Further, the sewage system A according to the present invention is provided with a treatment tank at a later stage,
For example, it can be applied to a treatment tank for denitrification.

Second Embodiment The structure of the sewage system according to the present invention is not limited to that shown in FIG. For example, a plurality of nozzles 5 for agitating the inside of the anaerobic treatment tank 1 may be arranged in the discharge passage 2d of the ejector pump 2 as in the sewer system B of FIG. In this embodiment, by operating the ejector pump 2, the wastewater guided to the sewer pipe 3 and the wastewater sucked from the intake 2b are ejected from the plurality of nozzles 5 to stir the stored wastewater in the treatment tank 1. To do.

(Third Embodiment) The present invention can be applied to a system for returning sludge, which is mixed with sewage and transferred to the next-stage treatment tank connected to the anaerobic treatment tank 1, to the anaerobic treatment tank 1. In this case, as in the sewage system C in FIG. 3, the suction section 2f of the ejector pump 2 is
The sludge return pipe 6 is connected with the sewage pipe 3. By doing so, the sludge can be sucked from the next-stage treatment tank by the negative pressure generated in the decompression unit 2e by the operation of the ejector pump 2 and ejected from the discharge unit 2c into the treatment tank 1.

In this embodiment, the upper void portion 8 of the anaerobic treatment tank 1 and the depressurizing portion 2e of the ejector pump 2 are communicated with each other through the suction portion 2f by the intake pipe 7, and the anaerobic gas in the treatment tank 1 is entrained, It was configured to be ejected from the discharge part 2c together with the circulating wastewater. As a result, it is possible to promote the crushing of the solid content in the wastewater.

In addition, the embodiment of the present invention can be variously modified according to the embodiment.

[Effect of device]

As is clear from the above description, the sewage system according to the present invention employs an ejector type pump as a means for circulating and stirring the wastewater stored in the anaerobic treatment tank, which is used as a negative pressure source for collecting the wastewater. As a result, it is possible to omit the conventional pressure pump required for feeding the sewage from the vacuum station to the sewage treatment plant. Further, if the anaerobic treatment tank is used for temporary storage of wastewater, the vacuum station can be eliminated.

In short, the present invention provides a sewage system excellent in practical effects such as low equipment cost and easy construction work as compared with the conventional one.

[Brief description of drawings]

FIGS. 1 (a) and 1 (b) show a first embodiment of the present invention, and FIG. 1 (a) is a side sectional view schematically showing a state of installation of a sewer system according to the present invention. (B) is a side sectional view of the sewer system. FIG. 2 is a side sectional view showing a second embodiment of the present invention, and FIG. 3 is a side sectional view showing a third embodiment of the present invention. FIGS. 4 (a) and 4 (b) show a conventional vacuum sewage system, wherein FIG. 4 (a) is a side sectional view showing the outline of the installation situation, and FIG. 4 (b) is a side sectional view of a vacuum station. Is. A, B, C …… Sewage system 1 …… Anaerobic treatment tank 2 …… Ejector pump 2a …… Pump 2b …… Intake part 2c …… Discharge part 2d …… Discharge path 2e …… Decompression part 2f …… Suction part 3 …… Sewage pipe 4 …… Advection pipe

Claims (1)

[Scope of utility model registration request] 1. A pump provided with an anaerobic treatment tank for treating sewage under anaerobic conditions, comprising an intake section for sucking the sewage stored in the tank and a discharge section for discharging the sewage into the tank. Provided in the middle of the discharge path of the pump is a depressurizing section that exhibits a Venturi effect to form an ejector and a suction section that communicates with the depressurizing section is formed, and a sewage pipe that guides sewage to the anaerobic treatment tank is provided in the pump. A sewage system characterized by being connected to a suction unit.