JPS646899Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a filtration device that efficiently performs overtreatment by stirring and fluidizing the concentrated liquid accumulated inside the screen.

Conventionally, filtration devices have been used in which liquids to be treated, such as sewage and human waste, are filtered through a drum-shaped screen, but in such filtration devices, if the screen becomes clogged, filtration cannot be carried out at the filtration section, and the inflow water becomes Overflow occurred as it was, and the excess residue was washed away as it was, making it impossible to obtain a high concentration excess residue.

This invention solves the above-mentioned drawbacks, divides the screen into a filter zone and a concentration zone by an intermediate partition plate, and uses a stirring device to stir the concentrated liquid accumulated in front of the intermediate partition plate, so that the concentrated liquid is uniformly distributed in the concentration zone. It is an object of the present invention to provide a filtration device which can flow into the filtration system and also wash the filtration surface by stirring the concentrated material, thereby allowing extremely efficient filtration treatment.

An embodiment of this invention will be described below with reference to the drawings.

This invention consists of a rotating drum screen 1 that passes through the liquid to be treated A, an intermediate partition plate 2 that partitions the interior of the rotating drum screen 1, and a stirring means that is provided near the intermediate partition plate 2 and that stirs the accumulated concentrated liquid B. 3.

As shown in FIG. 1, the rotating drum screen 1 is arranged to be inclined toward the discharge port 4 side, and is rotationally supported by a support roller 5 driven by a drive section (not shown). Inside this rotating drum screen 1 is a donut-shaped intermediate partition plate 2.
It is divided into two areas by. In other words, there is a filter zone (filter section) 7 where the liquid to be treated A supplied from the feeder 6 is passed through, and a concentration zone (concentrator section) 8 where the concentrated liquid from the filter zone 7 flows and is further concentrated. It is sectioned. Further, a donut-shaped end partition plate 9 is provided at the inner periphery of the lower end of the concentration zone 8, which functions to retain a certain amount of the concentrate remaining inside and to maintain the concentration pressure.

Further, as shown in FIG. 1, the stirring means 3 is constituted by an air supply pipe in this embodiment, and the opening at the tip of this air supply pipe is disposed on the side of the overzone 7 near the intermediate partition plate 2. The concentrated liquid B accumulated in the liquid reservoir 10 on the zone 7 side is stirred.

According to the above configuration, the liquid to be treated A such as sewage is
As shown in FIGS. 1 and 2, the liquid C is supplied to the upper inner surface of the screen 1 from a supply device 6 having a guide piece 6a for guiding the liquid to be treated, passes through a passing zone 7, and is discharged to the outside. . On the other hand, the liquid concentrate B accumulates in the liquid reservoir 10 in front of the intermediate partition plate 2,
When the water reaches a certain level, it crosses the intermediate partition plate 2 and flows into the concentration zone 8, where it is further dehydrated. At this time, as described above, the concentrated liquid B accumulates in front of the intermediate partition plate 2, and the solids precipitate here, so if a large amount of this accumulates, there is a risk that sufficient overtreatment cannot be performed. Therefore, in this invention, the air supply pipe (stirring means) 3 is introduced into the liquid reservoir 10, and the concentrated liquid B accumulated here is aerated and fluidized, so that the concentrated liquid B can flow into the concentration zone 8 in a uniform state. I did it like that. Furthermore, since the concentrated liquid B is flowing, the filtration surface can be washed and the overtreatment in the filtration zone 7 can be carried out effectively.

Here, as shown in FIG. 3, the intermediate partition plate 2 is
By forming the notch 2a, the flow into the concentration zone 8 can be performed intermittently at a certain flow rate, so that the concentrated liquid B can be transferred smoothly, and the concentration zone 8 can also be cleaned by this flow. Furthermore, movement of the slag in the concentration zone 8 is also promoted.

FIG. 4 shows another embodiment in which the stirring means 2 is constructed of a mechanical device. The stirring means 3 is composed of stirring blades immersed in a liquid reservoir 10 in front of the intermediate partition plate 2, and is configured to be rotated by a motor 11. Therefore, by rotating the stirring blade 3 within the liquid reservoir 10, the concentrated liquid flows as in the above embodiment, and the same effect is achieved. Since the water depth in the liquid pool is very shallow, stirring using such a mechanical device is more efficient in terms of power than stirring using air blowing. The stirring blade (stirring means) 3 may have any structure as long as it can aerate and flow the concentrated liquid B in the liquid reservoir 10 as shown in FIG.

As described above, according to this invention, since the concentrated liquid accumulated in front of the intermediate partition plate of the screen is stirred and made to flow, the concentrated liquid can flow into the concentration zone in a uniform state, and the filter surface can also be cleaned, which is extremely effective. It has excellent effects such as being able to perform overtreatment.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view of one embodiment of this invention;
3 is a front view of the rotating drum screen, FIG. 3 is a front view of the intermediate partition plate, FIG. 4 is a longitudinal sectional view of another embodiment, and FIG. 5 is a perspective view of the stirring blade. DESCRIPTION OF SYMBOLS 1... Rotating drum screen, 2... Intermediate partition plate, 2a... Notch, 3... Stirring means, 6...
Supply device, 7... Passing zone (passing section), 8... Concentrating zone (concentrating section), 10... Liquid reservoir section.

Claims (1)

[Claims for Utility Model Registration] (1) A rotating drum screen which is arranged at an angle and rotates through the liquid to be treated supplied inside and discharges the dregs from the lower end, and a rotating drum screen provided inside the rotating drum screen, A filter comprising a doughnut-shaped intermediate partition plate that partitions the rotating drum screen into an upper filter zone and a lower concentration zone, and a stirring means for stirring the concentrated liquid accumulated on the filter zone side near the intermediate partition plate. Device. (2) The passing device according to claim 1, wherein the intermediate partition plate is provided with a notch.