JPS64983Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a filtration device that includes a water level gauge near an intermediate partition plate that partitions a screen for filtration of a liquid to be treated, and measures the liquid level to control cleaning of 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 remains as it is. It will overflow and the excess residue will be washed away. Therefore, conventionally, cleaning was performed once every 30 to 40 minutes (about 3 minutes). However, with this method, unnecessary cleaning is repeated even when the concentration of the liquid to be treated is low, resulting in poor cleaning efficiency.

This invention was made to solve the above-mentioned drawbacks. By installing a water level gauge in the liquid pool of the rotating drum screen, the clogging state of the screen can be detected based on the liquid level, and the The purpose of the present invention is to provide a cleaning device that can perform efficient cleaning depending on the properties.

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 water level gauge installed near the intermediate partition plate 2 to control cleaning. 3.

As shown in FIG. 1, the rotating drum screen 1 is tilted toward the discharge port 4 and is rotatably supported by a support roller 5 driven by a motor M. And this rotating drum screen 1
The inside is separated by the donut-shaped intermediate partition plate 2.
A passing zone (passing section) 7 which is partitioned into two zones and passes through the liquid to be treated (A) supplied from the supply device 6;
It is divided into a concentration zone (concentration section) 8 into which the concentrated liquid from the filtration zone 7 flows and is further concentrated. 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.

Above the rotating drum screen 1 is a cleaning means 1.
1 is provided, and cleaning is performed by wiping cleaning water W onto the rotating drum screen 1. Here, the cleaning means supplies the cleaning water W to the filter zone 7 through the pump _P1 .
via the cleaning means 11a and the pump _P2 that supply the
It consists of cleaning means 11b which supplies the concentration zone. A skimming box 12 is provided on the pass zone 7 side of the intermediate partition plate to skim the liquid in the liquid reservoir 10 and transfer it to the concentration zone 8.

As shown in FIG. 1, the water level gauge 3 is provided in the vicinity of the intermediate partition plate 2 and on the overzone 7 side of the partition plate 2 to measure the liquid level accumulated in the liquid reservoir 10 on the overzone 7 side. Measure. If the water level exceeds a certain level as measured by the water level gauge 3, the cleaning means 1
1 to clean the rotating drum screen 1.
It is also good to combine this with drum screen rotation speed control.

Also, if you increase the rotation speed of the drum screen,
It is better to control the rotation speed according to the liquid level, as this will increase processing capacity. An example of control using a water level gauge is shown below. When the water level reaches _L1 , increase the rotation speed of motor M. When the water level reaches _L2 , drive the wash water pump _P1 to clean the excess zone. When the water level reaches _L0 , stop the wash water pump _P1. , the wash water pump _P2 , which returns the rotational speed of the motor M to the normal rotational speed, is periodically driven by a timer. Note that L ₀ is the lowest water level, L ₁ is the intermediate water level, and L ₂ is the highest water level.

According to the above configuration, the liquid to be treated (A) such as sewage is supplied from the supply device 6 to the upper surface of the screen 1, is effectively passed through the filter zone 7, and the liquid (B) is discharged to the outside. On the other hand, the liquid concentrate accumulates in front of the intermediate partition plate 2, and when it reaches a certain level, it crosses the intermediate partition plate 2 and flows into the concentration zone 8, where it is further dehydrated. Here, in this invention, the level of the liquid reservoir 10 in front of the intermediate partition plate 2 is measured using the water level gauge 3,
Cleaning is performed when the temperature exceeds a certain level. Therefore,
Unlike in the past, the screen 1 is clogged and filtration cannot be carried out in the filtration zone 7, and the inflow water directly overflows the intermediate partition plate 2, and the residue in the concentration zone 8 is also flushed out, which is unnecessary. Do not repeat cleaning. At this time, since the concentrated liquid does not stand still, it is preferable to output the concentrated liquid only when it reaches a predetermined water level within a predetermined time (for example, 5 seconds).

FIG. 3 shows an embodiment in which a water level gauge 2 and an air supply pipe 11 are disposed inside the rotating drum screen 1 and a concentrated liquid reservoir 10.

As mentioned above, the concentrated liquid remaining in the concentration zone 7 accumulates in front of the intermediate partition plate 2, and the solids precipitate here. Therefore, if the solids are not sufficiently transferred to the concentration zone 8 and a large amount of this accumulates, There is a possibility that sufficient overprocessing cannot be performed. Therefore, in this embodiment, the air supply pipe 11 is guided to the concentrated liquid reservoir 10,
By aerating and fluidizing the concentrated liquid, the concentrated liquid could flow into the concentration zone 8 in a uniform state. Furthermore, since the concentrated liquid 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. 4 on the intermediate partition plate 2,
By forming the notch 2a, the flow into the concentration zone 8 can be made intermittently at a certain flow rate, so that the concentrated liquid can be transferred smoothly, and also has the effect of cleaning the concentration zone 8. The movement of slag is also promoted.

In addition, when measuring the liquid level using the water level gauge 2, it is preferable to stop the air supply at regular intervals. Further, mechanical stirring means may be provided instead of air supply.

As mentioned above, according to this plan, the water level gauge is placed in the concentrated liquid reservoir of the rotating drum screen, so
There are effects such as efficient cleaning depending on the properties of the water to be treated.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view of one embodiment of this invention;
The figure shows a front view of the rotating drum screen, FIG. 3 shows a longitudinal sectional view of another embodiment, and FIG. 4 shows a plan view of the intermediate partition plate. 1...Rotating drum screen, 2...Intermediate partition plate,
3... Water level gauge, 7... Passage zone (passage part), 8... Concentration zone (concentration part), 10... Liquid reservoir part.

Claims (1)

[Scope of utility model registration request] A rotating drum screen is arranged at an angle and rotates to pass through the liquid to be treated supplied inside, and discharges the dregs from the lower end. a donut-shaped intermediate partition plate that partitions the concentration zone into a concentration zone; a water level meter that is provided near the intermediate partition plate and measures the liquid level of the concentrated liquid accumulated on the above-mentioned concentration zone side of the intermediate partition plate; and this water level meter. and a washing device for the rotating drum screen which is controlled on and off according to the measured value of.