JPH08243308A - Floating filter medium packed sedimentation basin - Google Patents

Abstract

PURPOSE: To provide a floating filter medium packed sedimentation basin whose scale is increased without the depth of a hopper for collecting mud being enlarged. CONSTITUTION: A hopper 3 is installed in the bottom part on the waste water inflow side of a rectangular sedimentation basin 1 equipped with a floating filter medium packed part 4. In a natural sedimentation part below the floating filter medium packed part 4, a scraper 10 of such a type that a lot of transfer elements 13 is reciprocated in the longitudinal direction of the rectangular sedimentation basin 1 is installed. The transfer elements 13 each has an almost vertical front surface and an inclined back surface, and only by reciprocating them, sludge is transferred to the hopper 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating filter-filled type sedimentation basin used for wastewater treatment.

[0002]

2. Description of the Related Art In a floating filter medium-filling type sedimentation basin, in which a floating filter medium filling portion having a specific gravity of 1 or less is filled in the upper part of a tank, and the lower part is a natural sedimentation portion The sludge is collected by using the entire surface of the bottom of the pond as a hopper as shown in FIG.

However, since this hopper usually requires an inclination angle of 60 degrees or more, the depth of the hopper must be made very large when the inflow of waste water is large and the area of the sedimentation basin needs to be enlarged. There is a problem that it must be. It is also possible to divide the sedimentation basin into a plurality of parts to avoid this problem, but this is not practical because the operation becomes complicated and a plurality of inflow pumps, inflow pipes, etc. are required. For this reason, the conventional floating filter-filled sedimentation basin is usually relatively small.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and enables to collect mud in the natural sedimentation portion without making the depth of the hopper very large, and to collect a large amount of waste water. It was made to provide a flotation filter-filled type sedimentation tank that can be used.

[0005]

The present invention, which has been made to solve the above-mentioned problems, provides a hopper at the bottom of a rectangular sedimentation tank equipped with a floating filter material filling portion on the wastewater inflow side, and
At the bottom of the floating filter medium filling section, a scraper of a type that reciprocates in the longitudinal direction of the rectangular sedimentation tank, is provided with a large number of transfer elements having a substantially vertical front surface and an inclined rear surface. .

[0006]

In the flotation tank filled with the floating filter material of the present invention, the sludge in the natural sedimentation section can be transferred by the scraper installed at the bottom of the floating filter material packing section and collected in the hopper on the waste water inflow side. Therefore, even if the area of the sedimentation tank is increased, it is not necessary to increase the depth of the hopper as in the conventional case.
Moreover, since the scraper of the present invention is of a type in which the transfer element is reciprocated in the longitudinal direction of the rectangular sedimentation tank, the drive mechanism may be installed only at the bottom of the pond, and the floating filter material filling section and the drive mechanism above it may be installed. There is no interference.

[0007]

The present invention will be described below in more detail with reference to the illustrated embodiments. In FIG. 1, 1 is a large rectangular sedimentation tank capable of handling a large amount of wastewater, 2 is its wastewater inlet, 3
Is a hopper for collecting mud provided at the bottom of the wastewater inflow side. Reference numeral 4 is a floating filter material filling section partitioned by a partition plate 5, and is filled with a floating filter material having a specific gravity of 1 or less.

The partition plate 5 has an upper end higher than the water surface,
It is installed so that the lower end is in the middle of the water depth and divides the water surface of the rectangular sedimentation tank, but the partition plate 5 may be omitted and the entire floating filter material filling section 4 may be used. Further, 6 is a water collecting pipe provided near the water surface of the floating filter material filling portion 7, 7 is a net for preventing the floating filter material from flowing out, and 8 is a blowout air for backwashing when solids are accumulated in the floating filter material. It is an air tube.

The portion of the rectangular settling tank 1 on the wastewater inlet 2 side of the partition plate 5 and the portion below the floating filter material filling section 4 are natural settling sections 9, and a scraper 10 is installed at the bottom of the pond. ing. This scraper 10 has a large number of transfer elements 13 having a substantially vertical front surface 11 and an inclined rear surface 12 as shown in FIGS. 3 and 4. As shown in FIG. Connected by 14. Further, each transfer element 13 has a length that is the full width of the bottom of the pond as shown in FIG.

As shown in FIG. 1, a link type drive mechanism 16 driven by a motor 15 is provided at the end of the drive rod 14, and the drive rod 14 is connected to the rectangular sedimentation tank 1.
Reciprocate in the longitudinal direction. The transfer element 13 connected to the driving rod 14 has a front surface which is a substantially vertical and gentle concave surface when moved leftward as shown in FIG.
The sludge at the bottom of the pond is moved to the left by 11, but Fig. 4
When returning to the right as shown in, the sludge rides over the sloped convex rear surface 12 and stays almost at the original position.
As a result, the sludge at the bottom of the pond is gradually moved toward the hopper 3 for collecting mud by simply reciprocating the driving rod 14, and is collected inside the hopper 3. The moving speed of the transfer element 13 in the left direction is, for example, 3 m / min, and the returning speed in the right direction is, for example, 12 m / min.

As described above, according to the present invention, the sludge settling at the bottom of the pond in the natural settling section 9 is transferred to a large number of transfer elements 13
Since the scraper 10 is provided with a hopper 3 provided at the bottom of the waste water inflow side, the depth of the hopper 3 does not need to be increased even when the rectangular sedimentation tank 1 is enlarged. Further, as shown in FIG. 5, the chain-driven scraper conventionally used in the first settling tank of the sewage treatment plant requires the return part of the endless chain to be provided in the upper part of the tank, so that the floating filter material filling part 4 May interfere with
Since the scraper 10 of the present invention can be installed only on the bottom of the pond,
It does not interfere with the floating filter material filling section 4.

[0012]

As described above, the flotation medium-filled type sedimentation basin of the present invention can easily collect mud in the natural sedimentation part even when it is made large enough to handle a large amount of wastewater. , Doesn't need a deep hopper. Therefore, it is suitable for treating a large amount of wastewater.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view in the width direction showing an example of the present invention.

FIG. 3 is a side view showing the forward movement of the transfer element.

FIG. 4 is a side view showing the return movement of the transfer element.

FIG. 5 is a sectional view showing a first settling tank equipped with a conventional chain-driven scraper.

FIG. 6 is a cross-sectional view showing a conventional floating filter-filled type sedimentation tank.

[Explanation of symbols]

1 rectangular sedimentation tank, 2 wastewater inlet, 3 hopper for mud collection, 4 floating filter material filling section, 5 partition plate, 6 water collection pipe,
7 Floating filter medium outflow prevention net, 8 Backwash air pipe, 9
Natural sink, 10 scrapers, 11 generally vertical front, 12
Inclined rear surface, 13 transfer elements, 14 drive rods, 15 motors, 16 drive mechanisms

Claims (1)

[Claims] A hopper is provided at the bottom of the rectangular sedimentation basin equipped with a floating filter material filling portion on the wastewater inflow side, and the basin portion of the floating filter material filling portion has a large number of front and sloping rear surfaces. A flotation filter-filled sedimentation tank characterized in that a scraper of the type in which the transfer element is reciprocated in the longitudinal direction of the rectangular sedimentation tank is installed.