JP2520919Y2 - Sewage treatment tank - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact aeration type sewage treatment tank.

[0002]

2. Description of the Related Art Conventionally, in a contact aeration type sewage treatment tank, a backwashing device is a necessary component for removing the biofilm deposited on the contact material 1. In general, an annular backwash pipe 2a is arranged below the contact material 1 as shown in FIG. 4 aiming at uniform discharge of the washing air.

[0003]

However, in this one, the backwash pipe 2a is mounted on the pedestal 16 installed at the bottom of the tank main body, but the tank main body is placed horizontally. The backwash pipe 2a is also arranged in a horizontal state in the installed state. If the horizontal state at the time of construction is incorrect, the backwash air is partially discharged from a part of the backwash pipe 2a. Therefore, even if the backwash pipe 2a is formed in an annular shape to widen the discharge range of the air for backwash, there is only one air discharge portion, and there is a problem that the backwash cannot be performed normally. there were. Therefore, by providing two or more independent backwashing pipes 2a as shown in FIG. 5, the range of backwashing can be widened and the amount of air per unit length can be increased. It is conceivable that backwashing can be performed regardless of madness. However, there is a problem in that mounting work during construction increases in proportion to the number of divisions, which makes mounting time-consuming.

The present invention is intended to solve the above-mentioned problems, and it is possible to reliably carry out backwashing and to easily install a plurality of discharge parts in a tank without time and effort. It is intended to provide a wastewater treatment tank.

[0005]

In the present invention, in order to achieve the above object, a discharge portion 2 for discharging backwash air, which is annularly formed, is arranged below a contact material 1 arranged in a processing tank. In the sewage treatment tank, two or more discharge units 2 are independently arranged, and each discharge unit 2 is connected by a joint member 3 in the same horizontal plane to be integrated.

[0006]

Since the independent discharge parts 2 are connected and integrated by the joint members 3, the backwash air discharged from the independent discharge parts 2 performs backwash over a wide range. In addition, in mounting, it is possible to simultaneously mount two independent discharge units 2 in a single mounting step without any trouble.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the illustrated embodiments. The sewage treatment tank is made of FRP or other synthetic resin and is divided into upper and lower parts as shown in FIG. 3, and the upper tank body 4a and the lower tank body 4b are aligned at the flange portion so that the bolts and nuts are joined together. The processing tank main body 4 is formed by fixing. Partition plate 5 in the processing tank body 4
A plurality of processing chambers are formed by the processing tank body 4
The sewage that flows in is treated by passing through each treatment chamber, cleaned, and then drained. In the illustrated embodiment, the anaerobic filter bed first chamber a, the anaerobic filter bed second chamber b, which serves as a processing chamber, extends from the sewage inlet 6 side.
A contact aeration tank c, a precipitation tank d, and a disinfection tank e are sequentially formed. Reference numeral 7 is a sludge return pipe for returning the sludge from the contact aeration tank c to the anaerobic filter bed first chamber a, 8 is a chemical pipe arranged in the disinfection tank e, 9 is a manhole, and 10 is an inspection port. 1
1 is an outlet.

A contact material 1 is installed in the contact aeration tank c, and a discharge portion 2 for discharging backwash air is provided below the contact material 1.
Is arranged. As shown in FIG. 1, the discharge part 2 has an annular backwash pipe 2a having a large number of air ejection holes 12 formed therein.
And the air ejection hole 12 of the backwash pipe 2a.
The biofilm deposited on the contact material 1 can be peeled off by ejecting more air for backwashing. The discharge parts 2 are independently arranged in two lines, and the discharge parts 2 are connected and integrated in the same horizontal plane by a joint member 3. An air supply pipe 13 having an on-off valve 14 is connected to each discharge part 2, and air is separately sent from each air supply pipe 13 to the discharge part 2.

The joint member 3 includes cheeses 3a provided at the opposite ends of the respective discharge parts 2 facing each other in the same horizontal plane,
It is composed of a connecting rod 3b that is installed between the opposing cheeses 3a. Here, the joint member 3 is not limited to this, and may be a connection clamp or the like. FIG. 3 shows another embodiment, in which three discharge units are provided. Also in this structure, the respective discharge parts 2 are connected to each other in the same plane by the joint member 3. In the illustrated embodiment, the discharge units 2 are arranged in two series or three series. However, as long as the discharge sections 2 are two series or more, any number of series may be provided.

However, the biofilm deposited on the contact material 1 is peeled off by ejecting the backwashing air from the independent backwashing pipes 2a. At this time, the independent backwashing pipes 2a are formed. It is possible to carry out backwashing over a wide range by the air for backwashing discharged more. In addition, since the discharge parts 2 are installed in the contact aeration tank c because the discharge parts 2 are connected and integrated by the joint member 3, two or more independent discharges can be performed in one mounting process. The parts 2 can be attached and constructed simultaneously without any trouble, and even if two or more discharge parts 2 are arranged, the assembly can be easily performed without any trouble.

[0011]

As described above, according to the present invention, since two or more discharge units are independently arranged and each discharge unit is connected and integrated in the same horizontal plane by a joint member, two independent discharge units are provided. Backwashing can be performed over a wide range by the backwashing air discharged from each of the above discharge units.
In addition, when mounting in the tank, it is possible to simultaneously mount and install two or more independent discharge units in one mounting process without taking time and effort.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing an embodiment of the present invention.

FIG. 2 is a partial perspective view showing another embodiment of the above.

FIG. 3 is a cross-sectional view showing an internal structure of the above wastewater treatment tank.

FIG. 4 is a partial perspective view of a conventional example.

FIG. 5 is a partial perspective view showing another conventional example.

[Explanation of symbols]

 1 Contact material 2 Discharge part 3 Joint member

Claims (1)

(57) [Scope of utility model registration request] 1. A sewage treatment tank in which a discharge portion for discharging backwash air, which is formed in an annular shape, is disposed below a contact material arranged in the treatment tank, and the discharge portions are independent of two or more series. Place and
A wastewater treatment tank in which each discharge part is connected and integrated in the same horizontal plane by a joint member.