JP3284302B2 - Packed bed water treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improved packed bed type water treatment apparatus.

[0002]

2. Description of the Related Art In some cases, water treatment equipment such as water supply equipment and sewerage equipment is provided with a water treatment apparatus having a packed bed such as a filtration apparatus or an adsorption apparatus using sand or activated carbon. In particular, in the case of water supply facilities, the quality of tap water has deteriorated in recent years, so the introduction of sand filtration equipment that performs two-layer filtration using anthracite and sand and the introduction of activated carbon adsorption equipment that filters with activated carbon have been rapidly increasing. It is going to.

FIG. 3 is a front sectional view illustrating a conventional pressure filter. As shown in the figure, inside a water treatment tank 1 of a filter, a packed layer 2 filled with a large number of particles and filtering the water to be treated is formed. The filling layer 2 is formed above a lower supporting layer made of a supporting material 3 such as gravel.

An L-shaped baffle plate is provided near the supply port 5 into which the water to be treated flows to disperse the water force.
6 are attached. The baffle plate 6 has a simple structure in which a substantially rectangular plate is bent and integrally formed, and its horizontal portion 7 is disposed to face the outlet end 5 a of the supply port 5. .

Therefore, the water to be treated that has flowed out of the water treatment tank 1 from the outlet end 5a of the supply port 5 flows into the baffle plate 6
Collides with the horizontal portion 7 and is dispersed and flows down to the surface of the filter medium 4. Then, the water to be treated is filtered by the filter material 4 and the support material 3
Then, it flows out from the outlet 8 to the outside.

[0006]

However, in the conventional filter, the water flow of the water to be treated flowing into the water treatment tank 1 from the supply port 5 is simply dispersed by the plate-shaped baffle plate 6 so as to filter the filter medium. 4, the water stream to be treated was not uniformly dispersed.

[0007] Therefore, particularly when the flow rate of the water flow is increased to increase the filtration speed, the filter medium 4 as fine particles moves due to the non-uniform water flow, and the surface of the packed bed 2 becomes wavy (a so-called wavy shape). Non-land phenomenon). When this non-landing phenomenon occurs, the water to be treated cannot be filtered with a stable water quality, and there is a possibility that the quality of the water flowing out from the outlet 8 may be deteriorated. In the worst case, the filter medium 4 and the support material 3 are mixed, and the filter medium 4 may flow out of the outlet 8 together with water.

The present invention has been made in view of the above circumstances, and has a rectifier equipped with a rectifying device capable of preventing a waving phenomenon on the surface of a packed bed and filtering a larger amount of water to be treated with more stable water quality than before. It is an object of the present invention to provide a packed bed type water treatment apparatus such as a water machine.

[0009]

In order to achieve the above-mentioned object, the present invention provides a water treatment tank into which water to be treated flows from a supply port, and a method in which the water treatment tank is filled with particles. A packed bed for filtering water, and a rectifying plate provided with a plurality of openings formed almost all over the inside of the water treatment tank and provided in the middle of the flow of the water to be treated from the supply port to the packed bed. And the flow straightening plate is configured to flow the water to be treated from the supply port.
Once, and a large number of
Characterized by the fact that it flows out substantially uniformly from the openings .

The aperture ratio of the current plate is 3% to 10%.
It is characterized by being.

[0011]

In the present invention, the water to be treated, which has flowed in from the supply port, flows out almost uniformly from a number of openings formed on almost the entire surface of the current plate provided in the middle. In order for this to be effective, it is appropriate that the aperture ratio of the current plate is 3% to 10%. Empirically, if the opening ratio is higher than this, a rectifying effect cannot be obtained, so that the unevenness phenomenon cannot be prevented. If the opening ratio is lower than this, the flow rate of water decreases, which is not practical. By appropriately providing the opening ratio of the flow straightening plate, the water to be treated can be straightened without reducing the amount of treated water. Thus, since the water flow of the water to be treated is uniformly dispersed over the entire surface of the packed bed, the unevenness of the particles in the packed bed is prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. (First Embodiment) FIG. 1 is a front sectional view showing a packed bed type water treatment apparatus having a rectifier according to a first embodiment of the present invention.

The filter 10 is a pressure filter, and the water to be treated is pumped to the filter 10 by a pump (not shown). The water to be treated is supplied to a water treatment tank 1 from a supply port 12 attached to an upper part of a water treatment tank 11 of the filter 10.
1 flows into the interior of the device.

The filling layer 13 for filtering the water to be treated is formed by filling a filter material 15 such as anthracite or sand into a water treatment tank 11 above a support material 14 such as gravel. In this embodiment, the support material 14 as the lower layer is made of gravel, and the filter material 15 as the upper layer is made of sand, and the filter medium 15 for filtering is a single layer. For example, if a two-layer structure composed of an anthracite layer and a sand layer is used, two-layer filtration can be performed.

Inside the water treatment tank 11, a rectifying plate 16, which is located above the packed bed 13 and partitions the flow of the water to be treated from the supply port 12 to the packed bed 13, is mounted. As the material of the current plate 16, iron or vinyl chloride is preferably used as long as it has sufficient strength.
A large number of openings 17 having a size of about 10 mm are formed. The current plate 16 is an orifice type current plate with an opening ratio of the opening 17 (ratio of the total cross-sectional area of the opening 17 to the total surface area of the current plate 16) of about 5%. In this case, since the opening 17 is a through hole (orifice) formed by punching, the flow regulating plate 16 is a perforated plate, but the shape of the through hole is arbitrary, and a lattice having a large number of other through slits is formed. The current plate 16 may be constituted by a member or the like. Although not shown, it is natural that a prevention means is provided upstream of the supply port in order to prevent blockage due to suspended matter such as dust. At the lower part of the water treatment tank 11, a discharge port 18 for discharging the filtered and cleaned water is attached.

Next, the operation will be described. When the water to be treated pumped by a pump (not shown) flows into the water treatment tank 11 from the supply port 12, the water to be treated is
, And stays in the upper space 19 of the current plate. This is because the opening ratio of the opening 17 of the current plate 16 is as small as about 5%, so that the upper space 19 and the lower space 2 of the current plate 16 are formed.
This is because there is a pressure difference between the pressure and zero. Then, the water to be treated in the upper space 19 closes each opening 17 of the current plate 16 by 0.5.
It passes down at a flow rate of less than m / s and flows down to the surface 21 of the filter medium 15. Then, the water filtered by the layer of the filter medium 15 flows between the support members 14 and is then discharged to the outside through the discharge port 18.

As described above, in the present embodiment, since the water to be treated flows down in a state where it is uniformly dispersed over the entire surface 21 of the filter medium 15, a non-landing phenomenon in which the filter medium surface 21 becomes wavy may not occur. Absent. Therefore, the water to be treated is filtered at the same filtration rate over the entire packed bed 13, and a large amount of the water to be treated can be filtered with a stable water quality without deteriorating the water quality. Further, it is possible to prevent the trouble that the filter medium 15 is mixed with the support material 14 and discharged from the discharge port 18.

When the filtration speed (LV) is compared with that of the conventional apparatus, it is conventionally necessary to set the filtration speed to 1 in order to prevent the occurrence of the irregularity phenomenon.
Although it was necessary to keep the filtration rate to 20 to 150 m / day or less, the filter 10 of the present embodiment does not cause an unlanding phenomenon, so that the filtration speed can be set to 1000 to 1200 m / day. It can be filtered in large quantities.

In particular, in the case of two-layer filtration or activated carbon filtration,
Although the filtration speed of the filter can be considerably higher than the filtration speed of the single-layer filter, in the conventional filter, the filter medium and the activated carbon are moved to cause an uneven phenomenon, and there is a concern that the quality of the treated water is deteriorated. However, according to the filter 10 of the present embodiment, since the non-landing phenomenon hardly occurs, the water to be treated can be filtered with stable water quality.

(Second Embodiment) FIG. 2 is a front sectional view showing a second embodiment of the present invention. Filter 30 according to the present embodiment
Is a gravity-type filter that filters the to-be-processed water 32 flowing into the water treatment tank 31 by its own weight. The water treatment tank 31 is provided with a supply port 33 for feeding the water to be treated and a perforated pipe 34 for discharging the filtered water. Water treatment tank 3
A partition wall 35 for partition is provided inside 1. The right side of the partition wall 35 in the figure is composed of the lower support layer of the support member 14 and the upper layer 13 of the filter medium 15 as in the first embodiment. In addition, instead of the perforated pipe type water collecting pipe type of this embodiment,
For example, even if a perforated plate is provided and a water collecting device is provided, there is no problem in practicing the present invention.

A supply port 33 is provided on the left side of the partition wall 35 in the drawing.
A straightening plate 36 is mounted transversely to the flow of the water to be treated from the container to the packed bed 13, and the structure of the straightening plate 36 is the same as that of the straightening plate 16 of the first embodiment. 17 are formed.

Therefore, when the water to be treated flows into the water treatment layer 31 from the supply port 33, the water to be treated is
, And flows upward uniformly from each opening 17 at substantially the same filtration speed. And partition wall 3
After passing over 5, it is filtered by the packed bed 13 and then discharged from the outlet 34.

If the flow straightening plate 36 is not provided, when the filtration speed is increased, the distribution of the flow of the water to be treated in the water treatment tank 31 becomes uneven and the surface of the filter medium 15 becomes uneven. Although the land phenomenon occurs, the provision of the current plate 36 makes the distribution of the flow of the water to be treated to the packed bed 13 uniform, and the non-land phenomenon does not occur. Therefore, the same operation and effect as those of the first embodiment can be obtained. In the drawings, the same reference numerals indicate the same or corresponding parts. The gist of the present invention is not limited to the above embodiment, and it goes without saying that various modifications are possible.

[0024]

Since the present invention is constructed as described above, it is possible to prevent a waving phenomenon on the surface of a packed bed of a water treatment apparatus and to filter a larger amount of water to be treated with more stable water quality than before.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a filter with a rectifier according to a first embodiment of the present invention.

FIG. 2 is a front sectional view showing a filter with a rectifier according to a second embodiment of the present invention.

FIG. 3 is a front sectional view showing a conventional filter.

[Explanation of symbols]

 10, 30 Packed bed type water treatment apparatus (filter) 11, 32 Water treatment tank 12, 33 Supply port 13 Packed bed 16, 36 Rectifier plate 17 Opening 32 Water to be treated

──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. ⁷ Identification code FI B01D 29/08 540A

Claims (2)

(57) [Claims] 1. A water treatment tank into which water to be treated flows into the inside from a supply port, a filling layer in which particles are filled in the water treatment tank to filter the water to be treated, and a filling layer from the supply port to the filling layer. A rectifying plate having a large number of openings formed almost entirely in the middle of the flow of the water to be treated, wherein the rectifying plate temporarily stops the flow of the water to be treated from the supply port.
Dams, a large number of openings provided on the entire surface of the current plate
A packed bed type water treatment apparatus characterized in that the water is discharged almost uniformly from the bed. 2. The packed bed type water treatment apparatus according to claim 1, wherein the aperture ratio of the current plate is 3% to 10%.