JPS592528B2 - water collection block - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water collection block used in a streambed for a polluted water filtering device in a water treatment plant or the like.

Conventionally, a water collection block used in a stream bed for a filtration device for filtering polluted water such as upper, sewage, or various industrial wastewater has a large number of dispersion holes on the upper surface, as shown in Fig. 1, for example. The interior of the blank main body 1 made of ceramics, synthetic resin, etc., in which 2 are arranged almost regularly, is a partition wall 3 in the shape of a square.
The water collection structure is divided into a dispersion chamber 4 and a water supply chamber 5 in which the dispersion hole 2 is opened, and a plurality of water orifices 6 are provided in the partition wall 3 that divides the dispersion chamber 4 and the water supply chamber 5. Blocks are commonly used.

The blank main body 1 is placed on the bottom of a filter basin 7, as shown in FIG. A support layer 10 made of gravel or the like is placed on top of the groove 9, and a filtration layer 11 made of silica sand, anthracite, etc. is placed above the support layer 10 to form a filtration and water collection section. 12 and a backwashing air supply pipe 13 made of a stainless steel pipe or the like is embedded in the support layer 10.

The filtration device 14 as shown in FIG. 2 is used for a long time and the filter layer 11 becomes clogged with trapped contaminants. Therefore, cleaning is performed at regular intervals to remove contaminants and maintain the filtration function. It is necessary to recover.

This cleaning operation is generally carried out using the water collection groove 9 at the bottom of the filter basin
Air-water mixed cleaning is performed in which cleaning water is supplied from the air supply pipe 13 and cleaning air is supplied from the air supply pipe 13.

However, the conventional water collection block shown in FIG. It takes time and effort to clean the air supply pipes 13 and causes problems such as corrosion of the air supply pipes 13, resulting in high costs. Because the cleaning strength applied to the support layer 10 differs between buried and non-buried locations, the stratified support layer 10 is disturbed, and the support layer 10 of the filtration medium or the top of the block falls down, etc. It had some problems and shortcomings.

Also, nowadays there is no need for a separate air supply pipe, e.g.
As shown in the figure, a dispersion chamber 16 having a large number of dispersion holes 15 opened on the upper surface and a water supply chamber 17 are formed by a plurality of inclined walls 18 such that the dispersion chamber 16 is disposed on the side of the water supply chamber 17. The water supply chamber 17 and the dispersion chamber 16 have a substantially triangular cross section, and have a plurality of air orifices 19 in the middle part of the inclined wall 18, and a plurality of air orifices 19 spaced apart from each other below the air orifices 19. A water collection structure having multiple water orifices 20 has also been proposed.

However, in the water collection block having the structure shown in Fig. 3, the inside of the water supply chamber 11, which has a triangular cross section, is used as a flow path for cleaning air and water. An air layer is formed at the top to create a free water surface, but since the free water surface is greatly undulated, the air orifice 19 is submerged in the water depending on the vertical fluctuations of the water surface due to the rippling, resulting in intermittent air bubbling and dispersion. It has the disadvantage that it is difficult to obtain dispersion.

The water collection block of the present invention was developed to solve these conventional drawbacks and problems, and since it has a cleaning air passage integrally within the block body, a separate backwashing air supply is required. This is a water collecting block that does not require pipes and is free from fluctuations and non-uniformity in air bubble dispersion due to ripples on the free water surface, and has a cylindrical block body with many dispersion holes arranged almost regularly on the top surface. are parallel to the axis of the block, a water supply chamber located on the lower side, a dispersion chamber located above the water supply chamber and in which the dispersion hole opens, and a position approximately adjacent to each of the water supply chamber and the dispersion chamber. The air supply chamber located in the center is separated from the air supply chamber by a partition wall, and the water supply chamber and the dispersion chamber are connected by a water orifice provided in the partition wall, and the water supply chamber or the dispersion chamber is separated from the air supply chamber. This is a water collection block with a structure connected by air orifices.

The more detailed structure of the present invention will be described with reference to FIG. 4 showing a specific example. A rectangular tube preferably made of ceramic or synthetic resin has a large number of dispersion holes 22 arranged in a substantially regular manner on the upper surface. The inside of the block body 21 has a water supply chamber 24, a dispersion chamber 25, and an air supply chamber 26, which are parallel to the block axis 23, and partition walls 27.
It is classified by

That is, the water supply chamber 24 is located below the block body 21, and the dispersion chamber 25 is located above it, and the dispersion hole 22 is opened and communicated with the dispersion chamber 25.

The air supply chamber 26 is located above the water supply chamber 24 and at a substantially central portion adjacent to the water supply chamber 24 and the dispersion chamber 25, respectively.

Also, a partition wall 27a that separates the water supply chamber 24 and the dispersion chamber 25
The water collection block has a structure in which a water orifice 28 is opened and installed therein, and a small-diameter air orifice 29 is provided in a partition wall 27b that separates the air supply chamber 26 and the water supply chamber 24.

In the specific example shown in FIG. 4, the cross-sectional shape of the air supply chamber 26 is circular as shown in the figure, and the air orifice 29 is connected to the partition wall 2 between the air supply chamber 26 and the water supply chamber 24.
7b, but it is not necessarily limited to this; for example, the cross section of the air supply chamber 26 may be triangular as shown in FIG.
9 may be provided on the partition wall 27e between the air supply chamber 26 and the dispersion chamber 25.

Note that the partition wall 2 that divides the water supply chamber 24 as shown in FIG.
7c and the partition wall 27d that divides the dispersion chamber 25 may, of course, be omitted, but if the material of the base is ceramic or the like, it is better to have one for reinforcement.

In addition, the water orifice 28 and the air orifice 29 in the specific example shown in FIGS. 4 and 5 are designed to prevent the air blow-out phenomenon during air-water mixed cleaning and the dispersion chamber 25 during air-only cleaning. In order to prevent uneven air distribution due to differences in ventilation resistance of the dispersion holes 22 due to water hold-up as air bubbles rise, the dispersion holes 22 and the dispersion holes 22 are not provided directly below the dispersion holes 22 in the upper part of the dispersion chamber 25. It is preferable to provide it approximately below the center between the two.

Furthermore, if the total opening area of the air orifice 29 is set to be less than or equal to the total opening area of the dispersion hole 22 on the top surface of the block, most of the expansion of the air will occur when the cleaning air passes through the air orifice 29, and the dispersion hole It is possible to extremely reduce air expansion when passing through the support layer 22, and to prevent disturbance of the support layer.

The water collection block of the present invention has the configuration described above. For example, the water collection block shown in FIG. Cleaning operations when a water filtration and water collection area is formed are as follows:
When cleaning water is supplied to the water supply chamber 24 and cleaning air is supplied to the air supply chamber 26, the cleaning air is ejected into the water supply chamber 24 through the air orifice 29 and mixed with the cleaning water in the water supply chamber 24. Ru.

The cleaning water uniformly containing numerous bubbles is supplied from the water orifice 28 to the dispersion chamber 25.

In the case of the specific example shown in FIG. 5, the cleaning air passes through the cleaning air orifice 29 in the air supply chamber 26 and is ejected into the dispersion chamber 25, while the cleaning water passes through the water orifice 28 and enters the water supply chamber 24.
The air is then supplied into the dispersion chamber 25, where air-water is mixed.

Then, by ejecting washing water uniformly containing countless air bubbles from a large number of dispersion holes 22 in the upper part of the dispersion chamber 25, the pollutants captured and accumulated in the permeation layer are washed and removed.
This makes it possible to restore the overflow capacity of the overflow device very easily.

Note that the above description of the cleaning operation for pollutants was based on the case where air cleaning and water cleaning are performed at the same time. Of course, it is also possible to do it in combination.

As described above, the water collection block of the present invention has a water supply chamber, a dispersion chamber, and an air supply chamber each independently within the block body, and the whole is integrated, so it is simple in structure and requires separate backwashing. It does not require an air supply pipe, and there is no fluctuation or non-uniformity in air foam dispersion due to ripples on the free water surface, and there is no sudden air expansion that disturbs the support layer when air is ejected from the dispersion holes. It can be used to treat polluted water such as water, sewage, or various industrial wastewater, and is extremely useful for industrial purposes and pollution prevention.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway perspective view of a specific example of a conventional water collection block, Figure 2 is a partially cutaway perspective view of a drainage device using a conventional water collection block, and Figure 3 is a conventional water collection block. FIGS. 4 and 5 are partially cutaway perspective views of different specific examples of the water collection block of the present invention. FIGS. 1.21...Block body, 2,15.22.
...Dispersion hole, 3, 27.27a, 27b, 27c
. 27d, 27e... Bulkhead, 4, 16.25.
...Dispersion chamber, 5,17.24...Water supply chamber, 6,20°28...Water orifice, 7...
...Sawaga Pond, 8...Opening, 9...
Water collection groove, 10...Support layer, 11...Sawa layer, 12...Sawa channel and water collection part, 13...
...Air supply pipe, 14...R filtration device, 18.
... Slanted wall, 19.29 ... Air orifice, 23 ... Axis of block, 26 ...
...Air supply chamber.

Claims (1)

[Scope of Claims] 1. A water supply chamber in which the inside of a cylindrical block body in which a large number of dispersion holes are arranged substantially regularly on the upper surface thereof is parallel to the axis of the block and located below the block body; It is divided by a partition wall into a dispersion chamber located on the upper side and in which the dispersion hole opens, and an air supply chamber located approximately in the center of each of the water supply chamber and the dispersion chamber, and further divided into a water supply chamber. and a distribution chamber are connected by a water orifice provided in a partition wall, and the water supply chamber or the distribution chamber is connected to an air supply chamber and an air orifice. 2. The water collection block according to claim 1, wherein the air supply chamber has a triangular or circular cross-sectional shape.