JPS6261606A - Apparatus for filtering sewage - Google Patents

Abstract

PURPOSE:To rapidly and uniformly perform the washing of a pre-filter material, by a method wherein sewage is aerated in a pre-filter bed to be passed therethrough from above and passed through a main filter bed from below through a sedimentation tank while a washing pipe is provided to the upper surface of the pre-filter material. CONSTITUTION:Sewage is sent into a pre-filter bed 5 from a sewage pipe 14 through an aeration pipe 15 directed upwardly and passed through a pre-filter material 13 to be sent into a sedimentation tank 10. At this time, sludge 33 is sedimented. Subsequently, the sewage is passed through the main filter material 21 in a main filter bed 6 from below while the filtered purified water flows in a water collection box 26 to be gathered to a water gathering chamber 7. When clogging was generated in the pre-filter material 13, the inflow of the sewage is stopped and a second sludge discharge valve 32 is opened to empty the filter apparatus 1 and fresh water is subsequently injected to the upper surface of the pre-filter material 13 from a first washing pipe 18. Fresh water is ejected onto the upper surface of the pre-filter material 13 while the aeration pipe 15 is revolved around the horizontal axis in a downwardly directed state to further rapidly wash the pre-filter material 13.

Description

[Detailed description of the invention] [Industrial application field] The present invention communicates a preliminary filtration tank and a main filtration tank through a sedimentation tank provided below them, and after aerating wastewater in the preliminary filtration tank, The sludge was passed from above between the preliminary filter media in the preliminary filtration tank, then passed through the settling tank and between the main filter media in the main filtration tank from below for purification, and the sludge was settled in the settling tank. This relates to sewage filtration equipment.

[Conventional technology]

As a device for cleaning the main filter material in the main filtration tank in the above-mentioned sewage filtration device, for example, the Japanese Patent Publication No. 47-1
Some of them are disclosed in Japanese Patent Application Laid-open No. 4860, Japanese Patent Application Laid-Open No. 153908/1980, and the like.

However, as far as the inventors know, there has not been a device that can effectively clean the preliminary filter medium.

[Problem that the invention seeks to solve]

Conventionally, after draining the wastewater from the preliminary filtration tank, fresh water was sprayed from the sewage inlet pipe to clean the preliminary filtering material, but since the cleaning area was too small to do so alone, a bucket, etc., was used as an auxiliary method. Cleaned by spraying clean water.

Therefore, cleaning was time consuming and extremely troublesome.

[Means for solving problems]

The present invention connects a preliminary filtration tank and a main filtration tank through a sedimentation tank provided below them, and allows wastewater to pass through the preliminary filtration material in the preliminary filtration tank from above, through the sedimentation tank, and then from below to the main filtration tank. It passes through the main filter material in the filter tank to purify it,
In addition, the above-mentioned problem is solved by providing above the preliminary filter medium a cleaning pipe with a valve that can spray fresh water onto the upper surface of the preliminary filter medium.

[For production]

According to the invention, fresh water is evenly injected onto the prefilter through a dedicated cleaning pipe, so that the prefilter is cleaned quickly and evenly.

〔Example〕

The drawing shows a sewage filtration device to which the present invention is applied,
Concrete filtration device i! (1) The top opening is
It is closed with an upper lid (2).

The inside of the filtration device (1) is partitioned by a vertical first partition wall (3) and a second partition wall (4), and is divided into a preliminary filtration tank (5), a main filtration tank (6), and a water collection tank arranged on the side. (7) is formed,
Below the perforated plates (8) and (9), which are the bottoms of the preliminary filtration tank (5) and the main filtration tank (6), there is a sedimentation tank (10).
is formed.

Inspection holes (11) are provided above each of the tanks (5), (6), and (7) in the upper lid (2), and each inspection hole (11) is normally closed with a cover (12). There is.

On the perforated plate (8) in the preliminary filter tank (5), a preliminary filter material (13) made of crushed stone or gravel and whose particle size gradually becomes finer toward the top is laminated to a required thickness.

At the top of the preliminary filtration tank (5), a horizontal wastewater pipe (14) is installed that penetrates the side wall of the filtration device 1 (1), and at its inner end, it always faces upward, but if necessary Accordingly, the first
As shown by the imaginary line in the figure, an aeration pipe (15) that can be rotated around a horizontal axis by appropriate means is connected so as to face downward.

The outer end of the waste water pipe (14) is connected to a waste water valve (16) and a fresh water valve (1).
7), it is connected to a dirty water source and a fresh water source, which are not shown.

As shown in FIG. 2, a first cleaning pipe (18) bent in a U-shape in plan view is arranged at a predetermined height from the preliminary filter material (13) on the inner surface of the preliminary filter tank (5). ing. The first cleaning pipe (18) is provided with a large number of water fountain holes (not shown) facing toward the preliminary filter material (13).

The first cleaning pipe (18) is connected to the first cleaning valve (19) through the first cleaning valve (19).
Connected to a fresh water source.

On the perforated plate (9) of the main filtration tank (6), a second cleaning pipe (2
0) is mounted, and above it, a main filter material (21) made of crushed stone or gravel and sand, whose particle size gradually becomes finer toward the top, is laminated to a required thickness.

The outer end of the second cleaning pipe (20) passes through the front wall of the filtration device (1) and is connected to a fresh water source via a second cleaning valve (22).

Above the main filtration material (21) on the inner wall of the main filtration tank (6), a sludge drainage groove (23) that is horizontal and projects inward is formed. A first mud drainage pipe (24) that penetrates the front wall of the filtration device (1) is connected to the mud drainage groove (23), and a first mud drainage pipe (24) is connected to the outer end of the first mud drainage pipe (24). A valve (25) is attached.

A horizontal water collecting box (26) with an open top is suspended from the upper lid (2) at the upper part of the inner side of the main filter tank (6).

A water conduit pipe (27) passing through the second partition wall (4) is connected to the bottom of the water collection box (26).

Inside the water collection tank (7), there is a V-notch plate (28) for flow rate detection.
is installed, and a filtration device (
A water purification pipe (29) penetrating the side wall of 1) is connected. A water purification valve (3o) is attached to the water purification pipe (29).

A second wandering pipe (31) that penetrates the side wall of the filtration device (1) is connected to the lower part of the settling tank (10). A second wandering mud valve (32) is attached to the second wandering mud pipe (31).

The filtration device mentioned above! In (1), close the fresh water valve (17), the first and second washing valves (19), (22) and the first and second mud valves (25: (32), and close the dirty water valve (16) and the clean water valve. (3
0) and open the aeration pipe (
15) and then sends the wastewater to the preliminary filtration tank (5).
The sewage is aerated and then passes through the preliminary filter material (13) from above, removing relatively coarse sewage and settling it.
While passing through R[(10), the sludge (33) settles.

The wastewater is then completely filtered while passing through the main filter material (21:) in the main filter tank (6) from below.

The filtered purified water flows into the water collection box (26), passes through the water guide pipe (27), collects in the water collection room (7), and flows into the water purification pipe (29:
water is distributed to desired locations.

The sludge (33) settled in the settling tank (10) is transferred to the second tank at any time.
By opening the wandering mud valve (32), the second wandering mud pipe (31)
more excreted.

If the above-mentioned filtration device is used for a long time and the preliminary filtration device (13) becomes clogged with sludge (33), the sewage pipe (16)
is closed to stop the inflow of sewage, the second sludge drain valve (32) is opened to empty the inside of the filtration device (1), and the first cleaning valve (19) is opened to As shown by the imaginary line, clean water is passed through the preliminary filter material (13) from the first cleaning pipe (18).
Spray on the top surface.

Then, the sludge (33) that had adhered to the preliminary filter material (13)
) is washed away by fresh water injected from the first washing pipe (18), flows down into the sedimentation tank (10), and flows out from the second mud pipe (32).

At this time, open the inspection hole (11) of the preliminary filtration tank (5),
Rotate the aeration pipe (15) of the waste water pipe (14) downward around the horizontal axis, open the fresh water valve (17), and pour fresh water from the aeration pipe (15) into the preliminary filter material (13). By spraying on the upper surface, the preliminary filter material (13) can be cleaned more quickly.

Also, when the main filter material (21) becomes clogged, as mentioned above, send it to the filter bag! (1) After emptying the inside of the second sludge valve (3
2), open the first wandering valve (25), and open the second
Open the flush valve (22).

Then, the fresh water injected from the second cleaning pipe (20) removes the sludge (33
) is washed into the settling tank (10).

When the settling tank (10) is filled with sewage, the second cleaning pipe (
The fresh water spouted from 20) passed upward through the main filter material (21) at high speed. The sludge (33) adhering between the fine particles is removed and flows out from the drain (23) through the first sludge pipe (24), and the sludge from each part of the main filter material (21) is removed. .

Therefore, with a simple operation, the preliminary filter material (13) and the main filter material (21) can be unclogged and used repeatedly for a long period of time.

In the above embodiment, the wastewater pipe (14) is also used for spraying fresh water, but a dedicated fresh water spraying pipe may be provided separately.

(Effects of the Invention) As described above, according to the present invention, clogging of the pre-filter material, which has been troublesome in the past, can be easily and completely eliminated, and the equipment cost is also extremely low.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of one embodiment of the sewage filtration apparatus of the present invention, and FIG. 2 is a transverse plan view taken along the line A-A in FIG. 1.

Claims (3)

[Claims] (1) The preliminary filtration tank and the main filtration tank are connected through a sedimentation tank installed below them, and the wastewater is passed through the preliminary filtration material in the preliminary filtration tank from above, passes through the sedimentation tank, and is filtered from below. A sewage filtration system that purifies water by passing through the main filter medium in the tank, and further comprising a washing pipe with a valve provided above the preliminary filter medium and capable of injecting fresh water onto the top surface of the preliminary filter medium. Device. (2) The preliminary filtration tank and the main filtration tank are connected through a sedimentation tank installed below them, and the wastewater is passed through the preliminary filtration material in the preliminary filtration tank from above, passes through the sedimentation tank, and is filtered from below. The main filter medium in the tank is passed through for purification, and above the preliminary filter medium is provided a cleaning pipe with a valve that can inject clean water onto the top surface of the preliminary filter medium, and further above the preliminary filter medium. A sewage filtration device characterized in that a fresh water injection pipe that can rotate around a horizontal axis and face downward is provided. (3) The sewage pipe is also used for fresh water injection, and the upward aeration pipe provided at the inner end thereof can be rotated around a horizontal axis. Sewage filtration equipment.