JPS60248290A - Apparatus for treating waste water - Google Patents

Abstract

PURPOSE:To allow the waste water to flow in the normal and the reverse direction by separating the inside of an aeration vessel with a U-shaped partition wall, providing a central partition wall vertically at the inside, and furnishing a bubble generator equipped with a bubble inducting device below the central partition wall. CONSTITUTION:A U-shaped partition wall 3 is provided to separate the inside of an aeration vessel 1 into the first treating chamber A1 and the second treating chamber A2 both of which communicate with each other only through a bottom flow passage 2, and a central partition wall 4 is vertically furnished to separate the inside of the partition wall 3 into the first diffusion passage B1 and the second diffusion passage B2. Then treating materials C1 and C2 for generating an aerobic microorganism film are provided respectively in the first treating chamber A1 and the second treating chamber A2, and an air diffuser pipe 5 for generating bubbles is furnished below the central partition wall 4. The passage of air bubbles D is changed over to one of the first diffusion passage B1 and the second diffusion passage B2 with an inductive device 6. Consequently, an air backwashing pipe can be dispensed with, the washing of the treating material is carried out smoothly, and the flow direction of the waste water through the treating material can be changed over.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a wastewater treatment device that purifies wastewater using an aerobic microbial film generated in an aeration tank.

<Prior Art> A conventional wastewater treatment device was configured as shown in FIGS. 4 and 5, for example. That is, the aeration passageway B and the processing chamber are divided by the partition wall 1 in the aeration tank 1, and the bubble generation aeration pipe 12 is installed at the lower part of the aeration passageway B, and the lower side of the treatment material C. A plurality of air backwash pipes 13 were installed.

However, in such a one-sided aeration type, the flow direction of the treated material C is always constant in the direction of the arrow. For this reason, there arises a drawback that the flow resistance in the treatment material C increases.

The cause is (a) Two sides of treated material C are clogged with floating matter.

(b) The thickness of the aerobic microorganism film on the surface of the passage in the treated material C increases, and the passage becomes clogged.

As a countermeasure against this clogging, it is often the case that an air backwash pipe 13 is installed and the treated material C is cleaned using the double-layered air bubbles, but this method has the following drawbacks.

(c) If the blowing rock for the air backwash pipe 13 and the blowing rock for the bubble generating air diffuser pipe 12 are the same, not only will the air from the air bubble generating air diffuser pipe 12 be stopped during backwashing, but also the air flowing from the air bubble generating air diffuser pipe 12 will be stopped. is filled with wastewater, which causes air bubbles to clog the diffuser pipe.

(d) If the above-mentioned two blowing rocks are separate, they will operate at the same time, so the rising backwash bubbles will collide with the downward flow of wastewater in the processing material C, and the It becomes impossible to clean each part smoothly and evenly.

<Purpose> The present invention requires only a bubble-generating diffuser pipe, which requires very little or no installation of an air backwash pipe, and allows the cleaning of treated materials to be carried out smoothly and evenly in all parts. The object of the present invention is to provide a wastewater treatment device that alternately generates forward and reverse flows of wastewater in a treatment material using air bubbles.

<Example> Hereinafter, an example of the present invention will be explained with reference to FIGS. 1 and 2.
In the present invention, a tJ-shaped partition wall 3 is installed vertically to partition the inside of the aeration tank 1 into a first processing chamber A1 and a second processing chamber A2 that communicate with each other only through a bottom flow path 2. A central partition wall 4 that divides the inside into a first air diffusion passage B1 and a second air diffusion passage B2 is installed vertically, and the first processing chamber A1 and the second processing chamber A2 are provided with a net-like or tubular structure in a submerged position. Processing materials CI and C2 for generating an aerobic microbial film consisting of tube bundles having small holes, etc. are installed, and a bubble-generating diffuser pipe 5 is installed below the central partition wall 4, and the bubble-generating diffuser pipe 5 is A bubble guiding device 6 is provided to guide rising bubbles to either one of the first air diffusion passage B1 and the second air diffusion passage B2.

In this embodiment, the bubble guiding device 6 includes a movable wall 8 that is swingably suspended from the lower end of the central partition wall 4 by a hinge 7, and a movable wall 8 that is connected manually or by power via a link or the like. and means (not shown) for appropriately swinging between the first posture 8a and the second posture 81 after a predetermined period of time.

In the present invention, instead of the movable wall 8, the position of the bubble-generating diffuser pipe 5 is alternately moved to one of the first diffuser passage B1 and the second diffuser passage B2 so that the bubbles rise. Good too.

Further, this predetermined time may be a fixed time determined by a timer 3, or may be a difference H between the water pressure at part a1 and the water pressure at the bottom flow path 2 on the bubble separation side in the aeration tank 1.
and the water pressure in the bottom channel 2 and the treatment material CI.

The difference H2 between the waste water in C2 and the water pressure in the outside part A2,
The flow path resistance in the treated materials C] and C2 may be detected and determined by detecting the sum of these (H=81+82).

In addition, 9a, 91] are raw wastewater supply pipes, '] Oa,
] Ob is a discharge pipe for treated water, and switching valves V 1 , V 2 , V 3 , etc. are provided to open one of these, and the selection of the open side is switched in synchronization with the swinging cycle of the movable wall 8. It's okay.

'', the bubble induction device 6 is activated at a predetermined period of time, and the movable wall 8 is swung between the first posture 8a and the second posture 81 at predetermined time intervals manually or by power via a link or the like. When it is moved, the flow direction of the waste water is alternately switched between the forward direction as shown by the solid line arrow and the opposite direction as shown by the dotted line arrow. Therefore, the aerated wastewater is transferred to the first treatment chamber A1 and the second treatment chamber A2.
Since the air flows through the air, the residence time in the aeration tank 1 becomes relatively long.

4- In the present invention, as shown in FIG.
When a collection net F is provided through the branch 4a and the pole joint 4 in the second part, the opening F1 is directed toward the second part for forward and reverse flow of wastewater, respectively, so that detached aerobic microbial films, etc. can collect floating objects.

<Effects> As is clear from the above description, the present invention includes a vertically installed U-shaped partition that partitions the inside of the aeration tank into a first processing chamber and a second processing chamber that communicate with each other only through a bottom flow path, A central partition wall is installed vertically to divide the inside of the U-shaped partition wall into a first air diffusion passage and a second air diffusion passage, and the first treatment chamber and the second treatment chamber are provided with an aerobic microorganism film generating chamber at a submerged position. A treatment material is installed, and a bubble generation/diffusion pipe is installed below the central partition, and the bubbles rising from the bubble generation/diffusion pipe are directed to either the first air diffusion passage or the second air diffusion passage. A bubble guiding device is provided.

Therefore, in the present invention, since the flow direction of wastewater is alternately switched between the forward direction and the reverse direction, the problems (c) and (d) above are solved, and at the same time, the following effects are achieved.

(e) Since the aerated wastewater flows between the first treatment chamber and the second treatment chamber, the retention time in the aeration tank becomes relatively long, which increases the flow velocity in the treatment material. If it is the same as before, the amount of diffused air may be small, and if the amount of air is kept the same, the flow velocity in the treated material will be faster.

(f) Set the operating cycle of the bubble induction device according to the degree of pollution and water quality of the raw wastewater.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of an embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a perspective view of the collection rope section, Fig. 4 is a longitudinal sectional view of a conventional wastewater treatment device, and Fig. 5 is its plan view. 1: Aeration tank, 2: Bottom channel, 3: U-shaped partition, 4: Central partition, 5: Bubble generation diffuser pipe, 6: Bubble guide device, 8:
Movable wall, 8a: first posture, 81): second posture, A1: first processing chamber, A2: second processing chamber, B1: first diffuser passage, B
2: Second aeration passage, C1: Treatment material, C2: Treatment material, D:
Bubbles. 71

Claims (1)

[Claims] A U-shaped partition is installed vertically to divide the inside of the aeration tank into a first processing chamber and a second processing chamber, which communicate with each other only through a bottom flow path, and the inside of the U-shaped partition is divided into a first aeration passage and a second aeration passage. A central partition wall partitioning into an aeration passage is installed vertically, and the first processing chamber and the second processing chamber 1
A treatment material for generating an aerobic microbial film is installed at the submerged position, and a bubble-generating diffuser pipe is installed below the central partition, and the air bubbles are sent from the bubble-generating diffuser pipe to the first diffuser passage. and a second air diffusion passage.