JPH0622480Y2 - Anaerobic ▲ floor ▼ floor tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an anaerobic floor tank used for treating sewage, and more particularly to improvement of an advection pipe of the anaerobic floor tank.

[Conventional technology]

Conventionally, treatment methods based on aerobic biological action such as activated sludge method, contact aeration method, and rotating disk method have been mainly used for treating organic wastewater such as domestic wastewater, but in recent years, anaerobic organisms have been used. A treatment method called an anaerobic bed method based on action has come to be used.

The anaerobic bed method is to fill and immerse an appropriate material with a biofilm composed of anaerobic organisms on the surface in a tank, pass sewage through this material, and contact the sewage with the biofilm. It purifies.

This treatment method has a slightly lower treatment efficiency than the aerobic contact aeration method, etc., but unlike the aeration method, the blower for propagating aerobic organisms and its power are not required, so equipment costs, It has the advantage of low maintenance costs. For this reason, it has been particularly noted as a treatment method suitable for treating small-scale domestic wastewater.

In order to effectively operate the anaerobic floor tank, as shown in FIGS. 3 and 4, the tank 1'is usually provided with overflow partition walls 2 ', and usually two or three material storage chambers 3', 4 ', 5 are provided. The advection pipe 6'which is divided into two in the cross-sectional direction by the partition wall 2'is provided at the boundary portion at a substantially central portion of the partition wall 2 '. Reference numeral 7'denotes a contact aeration tank in the next step, and 8'denotes a disinfection tank in the final step.

[Problems to be solved by the invention] The material storage chamber has a substantially rectangular shape, and on the other hand, since one advection pipe provided in the central portion of the overflow partition wall, that is, one advection part performs advection of sewage, Sewage transferred from the first chamber 3'to the second chamber 4'and from the second chamber 4'to the third chamber 5'is not evenly distributed within the second chamber 4'and the third chamber 5 ', respectively. The volume of the dead water part A where the flow of dirty water is stagnant increases,
The entire volume of the tank could not be used effectively.

Also, it is necessary to periodically remove the sludge accumulated on the bottom of the floor tank, but since the advection pipe is provided at one place, it was not possible to absorb the sludge on the entire bottom using a vacuum hose.

[Means for solving problems]

The above-mentioned drawbacks in the prior art are that each has a side wall and an end wall and a bottom that face each other, and the space between the end walls is bounded by a plurality of material storage chambers for storing the anaerobic material through the overflow partition wall. , An anaerobic floor tank provided with an advection pipe connecting the respective material storage chambers across the partition wall at the boundary portion, wherein the first and second material storage chambers among the plurality of material storage chambers are accommodated. Two advection pipes 13 are provided at the boundary between the chambers 6 and 7, and the advection pipes are arranged close to the opposing side walls 2 and 2, respectively, and the upper end of the advection pipe 13 is at a desired water level W. ． Anaerobic floor formed by opening above L and opening the lower end in the vicinity of the bottoms of the material storage chambers 6 and 7 to communicate from the bottom of the first material storage chamber 6 to the bottom of the second material storage chamber 7. Achieved by the tank.

〔Example〕

 An embodiment of the present invention will be described with reference to FIGS.

The anaerobic floor tank 1 is formed in a substantially rectangular box shape having an upper part opened by a side wall 2, an end wall 3 and a bottom wall 4, and the upper part is usually covered with a slab with an inspection manhole. . The space between the end walls is bounded by two overflow partition walls 5 into three material storage chambers, that is, first, second and third material storage chambers 6, 7, and 8. The third material storage chamber 8
And a disinfection tank 10 is provided in connection with the contact gas chamber 9. In the case of this embodiment, the right end wall 3 and the wall between the contact aeration tank 9 and the disinfection tank 10 are formed in an overflow shape.

Overflow partition wall 5 between the first and second material storage chambers 6 and 7
Desired water level W. Two openings 12 at a level equivalent to L
And two advection pipes 13 are provided so as to straddle the overflow partition wall 5 and surround the opening 12.
The two advection tubes 13 are arranged so as to be wide enough in the width direction, that is, the respective advection tubes 13 are arranged close to the side wall 2. Two advection tubes 14 having substantially the same structure as described above are also provided in the partition wall between the second and third material accommodating chambers 7 and 8, but one advection tube 14 and one opening 12 may be provided for the reason described later. .

15 is an inflow port provided above the first material accommodating chamber 6, and 16
Is an outlet provided in the disinfection tank 10. Contact contact air tank 9
An air pipe 17 communicating with a blower (not shown) is provided in the center of the
However, chlorine sterilizers 18 for disinfection are provided above the disinfection tank 10. An appropriate material P is filled and immersed in each of the material storage tanks 6, 7 and 8 described above, and a biofilm is formed on the surface of the material P by anaerobic organisms.

Next, the operation of the present invention will be described.

The sewage that has flowed in through the inflow port 15 passes through the material P in the first material storage chamber 6 in a downward flow, and stores the second material by the two advection pipes 13 between the first and second material storage chambers 6 and 7. Advection pipe 14 reaching the bottom of chamber 7 and then between second and third material storage chambers 7, 8.
Through the third material storage chamber 8. In this way, the sewage is purified while passing through the material P on which the anaerobic biofilm is formed.

Continuing from the upper part of the third material storage chamber 8
Transferred to. The material Q in the contact aeration tank 9 is formed with an aerobic biofilm, and is aerated by the air blown through the air pipe 17, and sewage is circulated in contact with the aerobic biofilm for purification. Subsequently, the supernatant water of the wastewater that has flowed into the disinfection tank 10 is sterilized with chlorine and then discharged to the outside.

Unlike the conventional anaerobic bed tank, since two advection pipes are provided in the present invention, sewage is evenly distributed in the material accommodating chamber and almost no dead water part is formed, and the contact efficiency of material is much improved. . Therefore, although the two advection pipes 14 are provided between the second and third material accommodating chambers 7 and 8 in this embodiment, the advection pipe 14 may be one. Further, if the first and second material storage chambers 6 and 7 can be sufficiently cleaned, the third material storage chamber 8 can be omitted.

[Effect of device]

In the present invention, the two advection pipes are provided at the boundary between the first and second material accommodating spaces as far as possible, so that the dead water portion in the anaerobic floor tank is reduced and the entire tank can be effectively used. The purification efficiency is improved. Further, since the vacuum hose can be inserted into the bottom of the tank from the two advection pipes, the sludge accumulated on the bottom of the tank can be efficiently sucked, which is a great advantage with a simple structure.

[Brief description of drawings]

1 and 2 are a schematic plan view and a vertical sectional view of an anaerobic floor tank of the present invention, and FIGS. 3 and 4 are a schematic plan view and a vertical sectional view of a conventional anaerobic floor tank. 2 ... Side wall of tank, 4 ... Bottom wall of tank, 6 ... First material storage chamber, 7 ... Second material storage chamber, 8 ... Third material storage chamber, 13 ... Advection pipe.

Claims (1)

[Scope of utility model registration request] 1. A space having a side wall, an end wall, and a bottom portion facing each other, and a space between the end walls is bounded by a plurality of material storage chambers for storing an anaerobic material through an overflow partition wall. Is an anaerobic floor tank provided with an advection pipe that connects the material storage chambers across the partition walls, and is the first or the first of the plurality of material storage chambers (6, 7, 8). Two advection tubes (13) at the boundary between the two material storage chambers (6, 7)
Are provided, the advection pipes are arranged close to the opposite side walls (2, 2), respectively, and the upper end of the advection pipe (13) is opened above a desired water level (W.L), An anaerobic floor tank, the lower end of which is opened in the vicinity of the bottom of the material storage chambers (6, 7) so that the bottom of the first material storage chamber (6) communicates with the bottom of the second material storage chamber (7).