JPH08964Y2 - Dust removal screen - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a dust removal screen, and in particular, it is disposed in a cross section of a wastewater flow path in a sewage treatment plant to remove scum and impurities in the wastewater from the wastewater. The present invention relates to a separating dust screen.

[Conventional technology]

The sewage treatment plant is equipped with a dust removal screen to separate scum and contaminants generated in the sand basin of the sewage treatment facility.

As shown in Fig. 3, this screen for removing dust is
A dust removing screen (16) is erected on the bottom surface (12) of the flow path via a concrete foundation (14). The dust removal screen 16 is
It is arranged in the cross section of the flow path and is inclined with a predetermined angle in the flowing direction of the dirty water 10 (the direction of the arrow in the figure). In addition, the dust removal screen has its upper end fixedly installed on the upper portion 18 of the flow path.

A rake 20 is arranged on the side of the dirty water 10 of the dust removal screen 16, and the rake 20 is connected to a lifting position (not shown) via a wire rope 22. Therefore, the scum 24 floating in the sewage 10 adheres to the surface of the dust removal screen 16 as the sewage flows. The attached scum is removed from the dust removing screen 16 by activating the lifting device and scraping the rake 20 upward, and sent to a belt conveyor (not shown). As a result, the scum 24 and the like are removed from the dirty water 10 that has passed through the dust removal screen 16 to become the separated liquid 26, which is sent to the next treatment step.

[Problems to be solved by the device]

However, the conventional dust removal screen is designed so that when the flow rate of the wastewater 10 decreases or the supply of the wastewater 10 stops,
As shown in FIG. 3, 10 is blocked by the concrete foundation 14 and stays there. The dammed sewage 10 has a drawback that it decomposes and produces a foul odor.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a dust removal screen capable of preventing the accumulation of dirty water.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention provides a dust removal screen (16) arranged in a channel cross section through a base (14) formed on a channel bottom surface (12) of sewage (10). In the above, the sewage flow hole (28) is formed in the base (14), and the upstream side (30) and the downstream side (32) of the flow path are communicated with each other with the screen (16) interposed therebetween. To do.

[Action]

According to the present invention, a flow hole (28) for sewage (10) is provided in a base (14) of a dust removal screen (16). As a result, even if the flow rate of the sewage (10) is reduced or the supply of the sewage is stopped, the sewage (10) is sent to the next treatment step without being retained by the foundation table (14).

〔Example〕

Hereinafter, preferred embodiments of a dust removing screen according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a dust removing screen according to the present invention, and the same or similar members as those in the conventional example shown in FIG. 3 are designated by the same reference numerals.

In FIG. 1, a concrete base 10 having a substantially trapezoidal cross section is formed on the bottom surface 12 of the flow path of the dirty water 10, and a dust removing screen 16 is erected through the concrete base 10. As shown in FIG. 2, the dust-removing screen 16 has flat steels 16a, 16a, ... Mounted at an angle. Further, the upper portion of the dust removing screen 16 is fixedly installed on the upper portion 18 of the flow path via a fixing jig 27. Further, a rake 20 is arranged on the surface of the dust removing screen 16 on the left side in the figure, and the rake 20 is attached to a lifting device (not shown) via a wire rope 22.
Therefore, the rake 20 can be moved up and down along the left surface of the dust removal screen 16 in the figure by the right end of the rake 22 in the figure via the cable 22 by activating the lifting device.

As shown in FIG. 2, a plurality of flow holes 28, 28 ... Are formed in the concrete base 14. The circulation hole 28 is formed in the same direction as the flow direction of the sewage 10 so as to connect the sewage flow path 30 and the separated liquid flow path 32. Further, the bottom surface of the flow hole 28 is flush with the top surface of the flow path bottom surface 12.

Next, the operation of the dust removing screen configured as described above will be described.

First, when the sewage 10 is flowing to fill the sewage flow path 30, a scum (not shown) floating in the sewage 10 adheres to the dust removal screen 16 as the sewage 10 flows. And
The sewage 10 from which the scum has been separated passes through the dust removal screen 16 and flows into the separated liquid flow path 32. The attached scum is
Screen for dust removal that is scraped by the rake 20
After being removed from 16, it is sent to a belt conveyor (not shown) and discharged to the outside.

Next, a case where the flow rate of the sewage 10 is reduced or the supply of the sewage 10 is stopped will be described.

First, when the flow rate of the sewage 10 is reduced or the supply of the sewage 10 is stopped, the sewage 10 staying on the sewage channel 30 side flows through the dust removal screen 16 into the separated liquid channel 32, and the concrete It also passes through the communication hole 28 in the base and flows into the separated liquid flow path 32 as well. As a result, the water level of the sewage 10 on the sewage channel 30 side gradually decreases. When the water level is located below the upper surface of the concrete foundation 14, the wastewater 10 flows from the circulation hole 28 to the separated liquid flow path 32 as shown in FIG. Therefore, even if the flow rate of the sewage 10 is reduced or the sewage supply is stopped,
Since it flows from 28 to the separated liquid flow path 32, the concrete foundation
It is possible to prevent the generation of a bad odor due to the retention of the sewage 10, as compared with the conventional dust removal screen that is blocked by 14 and retains.

[Effect of device]

As described above, according to the dust removing screen of the present invention, the through hole is formed in the base stand of the dust removing screen,
Since the retention of dirty water is prevented, it is possible to prevent the generation of offensive odor due to the retention of dirty water.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a dust removing screen according to the present invention, FIG. 2 is a sectional view taken along line II in FIG. 1, and FIG. 3 is an embodiment of a conventional dust removing screen. FIG. 10 …… Sewage, 14 …… Concrete foundation, 16 …… Dust removal screen, 20 …… Rake, 28 …… Flow hole, 30 …… Sewage flow path, 32 …… Separated liquid flow path.

Claims (1)

[Scope of utility model registration request] 1. A dust removing screen disposed in a cross section of a flow path through a foundation table formed on the bottom surface of the flow path of the waste water, wherein a circulation hole for the waste water is formed on the foundation table, and the screen is sandwiched. A dust removing screen characterized in that the upstream side and the downstream side of the flow path are communicated with each other.