JPH06254542A - Activated carbon filter device - Google Patents

Abstract

PURPOSE:To provide an activated carbon filter device capable of prolonging filtering duration and lessening the quantity of water for back-washing. CONSTITUTION:In the activated carbon filter device for purifying an original water for purified water containing a suspended solid after flocculating and settling, the activated carbon filter, device having a two bed structure composed of a carrier bed 12 made of a carrier having smaller specific gravity than activated carbon and an activated carbon bed 14 arranged in the lower step thereof are provided in a treating tank 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an activated carbon filtration device for removing trace organic substances, odorous components, etc. in inflow water by activated carbon.

[0002]

2. Description of the Related Art Conventionally, an activated carbon filtering device of a fixed tank type having a downward flow (a system in which treated water is supplied from the upper part and treated water is discharged from the lower part of the tank) is filled with activated carbon only. It has been configured.

[0003]

However, in the above-mentioned prior art, since the filling material is only activated carbon, if there is suspended turbidity of the inflow water (water to be treated), these accumulate on the surface side. It's easy to do. When suspended turbidity accumulates, clogging occurs, the head rising speed is accelerated, the duration of filtration is shortened, and backwashing (supplying water for washing to the activated carbon layer from the direction opposite to the inflowing water passage direction) Frequency). As the backwash frequency increases, the backwash water volume also increases,
There is also a problem that the wear of the activated carbon becomes severe, the packing density of the activated carbon increases, and the pressure loss of the activated carbon increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide an activated carbon filtration device which has been made in view of the above-mentioned circumstances of the prior art and which can increase the duration of filtration and reduce the amount of backwash water.

[0005]

In order to achieve the above object, the present invention is an activated carbon filtration apparatus for purifying raw water for purified water containing suspended turbidity by activated carbon, the carrier comprising a carrier having a specific gravity smaller than that of the activated carbon. A layer and an activated carbon layer disposed below the carrier layer are provided.

[0006]

According to the above-mentioned means, the activated carbon layer and the carrier layer disposed above the activated carbon layer and having a lighter specific gravity than the activated carbon have a two-layer structure, and the suspended turbidity in the inflow water is mainly captured by the carrier layer. The amount of suspended turbidity flowing into the activated carbon layer is reduced and the amount of backwash water in the activated carbon layer can be reduced. As a result, it is possible to reduce the amount of backwash water and extend the duration of filtration.

[0007]

1 is a front sectional view showing an embodiment of an activated carbon filtration device according to the present invention, and FIG. 2 is a sectional view showing details of a backwash water pipe portion of a carrier layer shown in FIG.

A carrier layer 12 is disposed above the treated water tank 10 having an open upper end, and an activated carbon layer 14 is disposed below the carrier layer 12. The material of the carrier layer 12 is a material having a lower specific gravity than the activated carbon layer 14 and a diameter equal to or larger than the average particle diameter of the activated carbon. As the material of the carrier used for the carrier layer 12, anthsalite, plastic, or the like can be used. A pipe 16 for removing the filtered treated water 18 is attached to the bottom of the treated water tank 10.

A nozzle 20 for backwashing is provided on the lower surface of the carrier layer 12, and a backwash water pipe 22 for supplying backwash water is connected to the nozzle 20. Similarly, a nozzle 24 is arranged below the activated carbon layer 14, and a backwash water pipe 26 is connected to the nozzle 24.

In the above structure, inflow water 28 is supplied from above the opening of the treated water tank 10, and suspended turbidity in the inflow water 28 is captured in the process of passing through the carrier layer 12, and then the activated carbon layer 14 Then, suspended solids that could not be removed by the carrier layer 12 and impurities other than the suspended suspended solids are removed, and the treated water 18 that has been cleaned is taken out through the pipe 16.
Then, backwash water is supplied to the nozzle 20 and the nozzle 24 periodically or as needed, and the carrier layer 12 and the activated carbon layer 1
Washing 4 is performed.

As shown in FIG. 2, the nozzles 20 are arranged so as to extend radially from the center of the treated water tank 10.
Carrier layer 12 that reduces resistance and has a lower specific gravity than activated carbon
Only the backwash can be backwashed, which contributes to the reduction of the backwash water amount. Further, by making the average particle size of the carrier of the carrier layer 12 larger than the particle size of the activated carbon, the packing density becomes lower, and suspended turbidity is trapped in the carrier layer 12 than when the surface layer is clogged. The filtration duration can be extended. Further, since the carrier layer 12 having a specific gravity lower than that of activated carbon is mainly backwashed, the number of times of backwashing the activated carbon layer 14 is reduced, and abrasion of the activated carbon can be prevented.

FIG. 3 is a front sectional view showing another embodiment of the present invention. Note that, in FIG. 3, the same reference numerals are used for the same elements as those used in FIG. 1, and thus duplicated description will be omitted below.

This embodiment is different from the above embodiment in that
A characteristic is that a backwash air pipe 30 is provided in the middle of the backwash water pipe 22. By providing the backwash air pipe 30, backwash water and backwash air can be supplied to the nozzle 20 at the same time. Thereby, when the carrier layer 12 is hard, the suspended matter is peeled off by backwashing with air without abrading the carrier,
The filtration duration can be further extended.

Next, the results of carrying out the present invention will be described. Here, using the configuration of FIG. 1, the river coagulation treated water was passed as the inflow water 28. The experimental apparatus uses a column having a diameter of 300 mm. The results are as shown in Table 1 (a table showing the relationship between the material, the carrier and the properties of the activated carbon) and Table 2 (a table showing the experimental conditions), where the conventional head rising speed was 4 cm / h.
In the present invention, it is 3 cm / h, which shows that the filtration duration time is extended. In addition, there is no difference in the quality of treated water.

[0015]

[Table 1]

[0016]

[Table 2]

[0017]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, in an activated carbon filtration device for purifying purified water containing suspended solids by activated carbon, a carrier layer made of a carrier having a specific gravity smaller than that of activated carbon and a lower layer of the carrier layer are provided. 2 with the activated carbon layer arranged
Since it has a layered structure, it is possible to reduce the amount of backwash water and to extend the duration of filtration.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of an activated carbon filtration device according to the present invention.

FIG. 2 is a cross-sectional view showing details of a backwash water pipe portion of the carrier layer shown in FIG.

FIG. 3 is a front sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 10 Treated Water Tank 12 Carrier Layer 14 Activated Carbon Layer 16 Piping 18 Treated Water 20, 24 Nozzle 26 Backwash Water Pipe 28 Inflow Water 30 Backwash Air Pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yutaka Okuno 1-1-14 Kanda, Uchida, Chiyoda-ku, Tokyo Inside Hirit Plant Construction Co., Ltd.

Claims (1)

[Claims] 1. An activated carbon filtration apparatus for purifying purified water containing suspended solids by activated carbon, comprising: a carrier layer made of a carrier having a specific gravity smaller than that of the activated carbon; and an activated carbon layer disposed below the carrier layer. An activated carbon filtration device characterized by being provided with.