JPS6341058Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a continuous filtration device for water to be treated, and particularly to a filtration device with excellent treatment performance.

A conventional device of this kind, as shown in Fig. 1,
A water sprinkling section 3 provided in the center of the filter tower 1 for receiving the water to be treated and sending it radially horizontally through the layer 2; A water collection section 4 for receiving and discharging the treated water sent and filtered as described above, and a water sprinkling section for moving the turbidity-containing material that has reached the lower part of the filter tower 1 with air and regenerating it. 3 and an air lift pipe 8 vertically installed to reach the upper part of the tower 1. In addition, in the figure, 5 is a supply pipe of the water to be treated that reaches the water sprinkling section 3, 6 is a discharge pipe for discharging the treated water from the water collection section 4, and 10 is the turbidity-containing material transferred by the air lift pipe 8. A material washing section for recycling, 11 is a discharge pipe for cleaning waste water generated in the material washing section 10, 7A is an inclined flat plate provided in multiple stages along the vertical direction in the water sprinkling section 3, and 7B is a collection pipe. This is an inclined flat plate provided in multiple stages along the vertical direction in the water section 4.

With this configuration, in the water collection section 4, the layer forming material (generally sand) is suitably retained by utilizing the angle of repose, and the treated water is prevented from passing through the gap between the inclined flat plates 7B. So,
Trouble generally decreases when clogging occurs due to material or turbidity.

However, when material accumulates on these inclined plates, water flow resistance increases due to the trapped turbidity, and eventually it flows out through the gaps between the inclined plates, making stable operation impossible. There are cases.

In order to solve this problem, the angle of inclination of the inclined flat plates can be increased to facilitate the vertical movement of the material, but the interval l between the inclined flat plates is as follows, l=P, as is clear from Fig. 2 below.・It is calculated as cosθ−t (1) (where P is the pitch of the inclined flat plate, t is its thickness, and θ is the inclination angle), so if you increase the inclination angle according to the above, the interval between the inclined flat plates will become smaller. As a result, the flow rate of the treated water increases in the interval.

When the flow rate of the treated water increases in this way, the material tends to flow out through the above-mentioned gap before the suspended solids are captured, so in order to prevent this, it is necessary to reduce the flow rate, and the filtration device performance deterioration is unavoidable.

An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a continuous filtration device for water to be treated that has excellent treatment performance regardless of the flow rate of the water to be treated.

The inventors of the present invention confirmed through experiments that material outflow at the water collection area is more likely to occur as the flow rate of treated water increases, and as a means of reducing the flow rate and facilitating the movement of materials, the inventors of the present invention used an inclined flat plate. Porous structure,
We have also found that it is effective to keep the inclination angle within a specific range.

The present invention was made based on the above knowledge, and is a continuous filtration device for treated water equipped with a water collection section having inclined flat plates in multiple stages along the vertical direction.
The inclined flat plate is characterized by having a porous structure and having an inclination angle of 75 to 85 degrees.

In the present invention, the holes provided in the inclined flat plate are
It is desirable to make it as large as possible within a range that does not allow the material to pass through, and the shape is generally preferably rectangular, but other rectangular or circular shapes are also acceptable. The pores are preferably provided so that the porosity is in the range of 10 to 40%.

Hereinafter, the present invention will be explained in more detail with reference to embodiments shown in the drawings.

Figure 2 is an enlarged view of a part of a porous inclined flat plate applied to the water collection part of the device of the present invention, which has rectangular holes with a hole spacing d, a thickness t, and a length _L0 . The porous structure inclined flat plates _7B1 are arranged in multiple stages along the vertical direction under the inclination angle θ with respect to the horizontal direction, the pitch P, the interval l, and the effective hole utilization length L per one inclined flat plate. There is.

With such a configuration, when θ is increased to eliminate the disadvantage of material staying on the inclined flat plate 7B ₁ , in other words, when l becomes smaller as is clear from equation (1) already stated. Even in this case, the pores provided in the inclined flat plate can be used as passages for the treatment liquid, making it possible to significantly increase the amount of water to be treated.

By the way, hole size = 1 x 12 mm, t = 4.5 mm,
L ₀ = 150mm, θ = 80°, P = 100mm, open area (β) =
22%, and the angle of repose (α) of the material in water is 35°, when carrying out the present invention, l is calculated as 12.9 mm from the above equation (1), and L is calculated as 90 mm from the following equation (2). be done.

L=P・cosα/(sinα・cosθ +cosα・sinθ) ...(2) By the way, the flow velocity ratio of the treated water on the inflow side and the outflow side of the inclined flat plate in the water flow direction can be obtained from the following equation (3). is known, and by substituting the above l=12.9 mm and L=90 mm into this, the above flow velocity ratio becomes 0.327.

Flow velocity ratio=(l+β·L)/P (3) On the other hand, the flow velocity ratio when using an inclined flat plate without holes is 0.129, and it is known that the former is about 2.5 times the latter.

This means that when tilted flat plates with a porous structure are used according to the present invention, the treated water flows through the gaps between the tilted flat plates and through the holes provided in the tilted flat plates, so the critical flow velocity is This means that the processing performance will be approximately 2.5 times that of the case where an inclined flat plate without such a plate is used, and the processing performance will be significantly improved.

Although the above has described typical embodiments of the present invention, the present invention is of course not limited to this, and there may be various other modifications and applications within the scope of the present invention. Needless to say. For example, holes do not need to be provided on the entire surface of an inclined flat plate;
It can also be provided only on the contact surface with the material, and the same effect can be achieved.

As described above, according to the present invention, the inclined flat plate provided in the water collection part has a porous structure, and the inclination angle is
By setting the angle to 75 to 85 degrees, it becomes easier to move the material vertically downward, and the critical flow velocity of the treated water is improved, thereby making it possible to significantly improve the treatment performance for the water to be treated.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing a conventional continuous filtration device for water to be treated, and FIG. 2 is a vertical cross-sectional view of a perforated inclined flat plate portion according to an embodiment of the present invention that can be applied to the water collection section of the device shown in FIG. FIG. 2... layer, 3... water sprinkling part, 4... water collection part, 7
B... Inclined flat plate, 7B ₁ ... Porous structure inclined flat plate,
8...Air lift tube.

Claims (1)

[Scope of utility model registration request] A continuous filtration device for treated water equipped with a water collecting section having multiple inclined flat plates in the vertical direction, characterized in that the inclined flat plates have a porous structure and the inclination angle is 75 to 85 degrees. Continuous filtration equipment for treated water.