JP2000093943A - Floating equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floating equipment which is excellent in separation efficiency. SOLUTION: A raw water feed pipe 2 is raised to midway in a tank 1. A pressure water feeder is connected to the raw water feed pipe 2 via valve 3. A water-collecting pipe 4 is provided in a lower part of the tank 1. A connecting part 10 a distributor 5 fits outside an upper end part of the raw water feed pipe 2. An aperture 6 for flowing out of water is provided to the distributor 5 so as to face an after flow in a gyratory direction. A skimmer 7 for scratching off a scum floated up is provided near a water surface of the tank 1. The skimmer 7 is attached to the distributor 5 by a supporting rod.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressurized flotation apparatus for flotation-separating a suspended substance from water containing the suspended substance, and in particular, supplies the water to be treated into a tank body by a swirling distributor. And a pressure flotation device.

[0002]

2. Description of the Related Art A distributor is provided rotatably in a tank, and while the distributor is swirled, mixed water of raw water and pressurized water flows out of the distributor into the tank so that suspended substances are floated and separated in the tank. An example of the pressure flotation device described in Japanese Patent Publication No. 56-23668 is disclosed.

[0003] The distributor disclosed in the publication has a tubular wastewater distribution arm extending in the radial direction of the tank body, and a water outlet pipe projecting below the wastewater distribution arm. A plurality of the arms are provided at intervals in the longitudinal direction of the arm.) And an opening for water outflow provided on a side surface of the water outlet pipe.

[0004] A plurality of the openings are provided on the side surface of the water outlet pipe extending in the up-down direction at an interval vertically. The opening is open toward the front side in the turning direction of the distribution arm (FIG. 4 of the same publication).

In the same publication, a scoop for scooping up the scum that has floated is provided. The scoop is in the form of an arm extending in the radial direction of the tank body, and performs a scooping operation while turning concentrically above the water surface with the distributor (FIGS. 1, 2, and 4 of the publication).

[0006]

SUMMARY OF THE INVENTION When the opening for water outflow is provided so as to open toward the upstream side in the turning direction of the distributor as in the above-described conventional case, the outflow from the opening is easily disturbed, and the suspended substance becomes finer or bubbles are suspended. Separation from the material reduces the separation efficiency.

It is a first object of the present invention to solve such a problem and to provide a pressure flotation device excellent in separation efficiency.

II. As described above, the scoop is formed in a revolving arm shape different from the distributor and is revolved above the tank body. A guide mechanism and a driving device for revolving the scoop are required, and the The equipment attached to the device becomes complicated. Further, a driving mechanism for causing the scoop to scoop is required, and the scooping mechanism itself has a complicated structure.

It is a second object of the present invention to provide a pressure levitation apparatus capable of simplifying a mechanism for discharging the scum.

[0010]

SUMMARY OF THE INVENTION A pressure flotation device according to the present invention has a tank having an annular peripheral wall, and extends radially from a center portion of the tank body. A means for supplying raw water into the distributor, a water outlet provided in the distributor toward the downstream side in the rotational direction, and a floating scum in the tank. And a gap to be approached, the gap being attached to the distributor.

In such a pressurized flotation device, since the water flows out of the distributor toward the downstream side in the distributor turning direction, the flow of the water is not easily disturbed. For this reason, the suspended substance is prevented from being finely divided and bubbles are prevented from being detached, so that an efficient flotation separation process is performed.

In the present invention, since a skimmer is attached to the distributor, a dedicated facility for swiveling the skimmer is not required, and the swivel-related devices of the pressure flotation device are extremely simplified. In addition, this gap is easy to install, replace, repair, and so on.

[0013]

FIG. 1A is a longitudinal sectional view of a pressure flotation device according to an embodiment, and FIG. 1B is a plan view thereof.
FIG. 2 is a cross-sectional view showing an example of attaching a gap, and FIG. 3 is a perspective view showing an example of a gap.

The tank body 1 having an annular peripheral wall is formed in a conical shape in which the bottom becomes lower toward the center, and the pit 1 is formed in the center.
a is provided. To the pit 1a, a sludge pipe having a sludge valve 11 is connected as a countermeasure when floating scum is settled. Raw water supply pipe 2 from this pit 1a
Is started up halfway in the tank body 1. A pressurized water supply device (not shown) is connected to the raw water supply pipe 2 via a valve 3.
Is connected.

A water collecting pipe 4 is provided below the tank 1. The water collecting pipe 4 is a tubular member that circulates along the peripheral wall of the tank body 1, and is provided with a hole-shaped water collecting port at predetermined intervals in the longitudinal direction. In addition, this water collecting port may be provided on any of the upper surface, the side surface, and the lower surface of the water collecting pipe 4, but is preferably provided on the lower surface side so that the inflow raw water is difficult to flow in a short circuit. Reference numeral 4a denotes a water collection drain pipe connected to the water collection pipe 4.

A connecting part (center cage) 10 of the distributor 5 is fitted on the upper end of the raw water supply pipe 2. The four distributors 5 extend in the radial direction of the tank 1, and the distributors 5 are assembled (connected) at the center of the tank 1. The connecting portion 1 having a cylindrical shape is formed downward from the collecting portion of the distributor 5.
0 is protruding.

The distributor 5 is turned inside the tank 1 by a motor 8. An opening 6 for water outflow is provided in the distributor 5 so as to face the wake in the turning direction.

A skimmer 7 is provided near the water surface of the tank body 1 to scrape the floating scum toward the scum outlet 9a. As shown in FIG. 2, the skimmer 7 is attached to the distributor 5 by a support rod 7a. In this embodiment, the support bar 7a is made of a double-cut bolt,
The lower end is fixed to the distributor 5 by a nut 7b. The support bar 7a may be a straight bar as shown in FIG. 2A, or may be an L-shaped one fixed to the side surface of the distributor 5 as shown in FIG. 2B.

As shown in FIG. 3, a vertical hole of the gap 7 is fitted into the upper part of the support rod 7a, and the gap 7 is fixed by tightening a nut 7b from above and below. After adjusting the direction of the gap 7 by loosening the nut 7b, the nut 7b
Can also be tightened.

As shown in FIG. 3, a rubber plate 7c may be attached to one of the gaps 7 arranged on the outer peripheral side, and the rubber plate 7c may be slid on the circumferential surface of the tank body 1. . In this way, the scum can be scraped extremely efficiently. A scum outflow portion 9 a and a trough 9 are provided on a part of the peripheral wall of the tank body 1.

In the pressurized flotation device configured as described above, water flows out from the opening 6 of the distributor 5 toward the downstream side in the turning direction of the distributor 5, so that the flow of water is less likely to be disturbed. For this reason, the suspended substance is prevented from being finely divided and bubbles are prevented from being detached, so that an efficient flotation separation process is performed. The scum that has floated is raked by the skimmer 7 to the outflow portion 9 a and discharged to the trough 9.

Since the skimmer 7 is attached to the distributor 5 via the support rod 7a and the nut 7b,
No special equipment for turning the skimmer 7 is required, and the devices related to turning of the pressure flotation device are extremely simplified. The gap 7 can be easily replaced or repaired, and the installation height and direction can be easily adjusted.

In the present invention, the skimmer 7 may be attached to the distributor 5 at a fixed (fixed) interval. However, as described above, preferably, the skimmer 7 is attached so as to be adjustable in height. It is better to be. For example, in the example of FIG. 2A, in order to adjust in the height direction, both nuts 7b sandwiching the gap 7 are loosened, the gap height is arbitrarily adjusted, and both nuts 7b are retightened.
In this way, by attaching the gap to the distributor in a height-adjustable manner, even when the water level in the tank changes due to fluctuations in the amount of treated water, the height of the gap is adjusted to rake the scum layer and the scum outflow section Scum can be sent to 9a. With conventional skimmers where height adjustment is difficult, when the water level rises, water in the tank is sent to the scum outlet together with the scum, causing a problem that the discharged slum concentration is reduced and a problem that the scum cannot be scraped. Occurs.

Although not particularly limited to the present invention, a gap of about 2 to 5 mm is provided between the outer periphery of the upper end portion of the raw water supply pipe 2 and the inner periphery of the connecting portion 10 so as to supply raw water. The tube 2 is inserted into the connecting part 10 by about 10 to 30 cm.

When the tank body 1 has a processing capacity of 15 to 25 m ³ / Hr, the aperture 6 has a diameter of about 5 to 7 cm, and the four distributors 5 are provided with a total of about 20 to 28 openings 4. Outflow speed of water from opening 6 is 3-10c
It is preferable to set it to about m / sec.

The rotation speed (peripheral speed) of the distributor 5 is 1 to 3 m / m 3 in order to prevent the water in the tank 1 from rotating together with the distributor 5 and the skimmer 7 to form a turbulent flow.
It is preferably set to about in.

In the present invention, as shown in FIG. 4, it is preferable to provide a rectifying plate 12 on the downstream side from the upper part of the distributor 5 (ie, so as to protrude above the opening 6).
The width of the current plate 12 is preferably about 120 to 180 mm. Further, it is preferable that the current plate 12 be provided with a gradient of about 1/20 to 1/30 so that the current plate 12 is lowered as the distance from the distributor increases.

In the present invention, it is preferable to provide a bubble bleed hole 13 having a diameter of about 3 to 8 mm at the end of the distributor 5 in order to extract the air remaining in the distributor 5.

[0029]

The pressurized levitation apparatus of the present invention can prevent turbulence in the tank and perform efficient levitation separation. In this pressure flotation device, the structure of the flotation scum discharge mechanism is relatively simple, and work such as installation, inspection, repair, adjustment, and replacement of the gap is also facilitated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view and a plan view of a pressure flotation device according to an embodiment.

FIG. 2 is an explanatory diagram showing an example of attaching a skimmer.

FIG. 3 is a perspective view showing an example of a gap.

4A is a perspective view of a distributor of the pressure flotation device according to the embodiment, and FIG. 4B is a cross-sectional view of the distributor of FIG.

[Explanation of symbols]

 Reference Signs List 1 tank body 2 raw water supply pipe 3 pressurized water valve 4 water collecting pipe 5 distributor 6 opening 7 skimmer 7a support rod 7b nut 8 motor 9 trough 12 rectifying plate

Claims (1)

[Claims] 1. A tank having an annular peripheral wall, a distributor extending in a radial direction from a central portion of the tank, and capable of rotating around the central portion in the tank, and a distributor. Means for supplying raw water into the distributor, a water outlet provided in the distributor, which opens toward the downstream side in the rotational direction, and a skimmer for scraping floating scum in the tank body, wherein the skimmer is provided with the distributor. Pressurized flotation device attached to.