JPS6157045B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a screen device for removing floating foreign matter mixed in wastewater in a sewage treatment plant, etc., which is particularly applicable to large-scale equipment.

In the past, inclined screens have been used in wastewater treatment, but because the wastewater contains hair, fibers, etc., the screen surface often becomes clogged, resulting in a reduction in treatment capacity.

In order to cope with this problem, cleaning means provided with a fountain device on the screen surface and cleaning means provided with a rotating brush have been devised.

However, in the case of the above-mentioned fountain device, it is not effective unless it is sprayed from the back of the screen, which causes foul odors due to the scattering of waste water on the screen surface, which is unsanitary. It has the disadvantage of being expensive, and there has been a demand for a sanitary and inexpensive device for large-scale processing equipment that uses a large number of screens.

In view of the above-mentioned current situation, the present invention provides a common foreign matter recovery path by horizontally connecting a plurality of inclined screens so that the upper ends are continuous with the overflowing part of the diversion channel from the water source and the screen surfaces form the same plane. With,
An extremely sanitary screen device for sewage treatment is provided in which a traveling cart having a set of two rotating brushes that sequentially engage the screen surface and rotate in opposite directions is arranged above the screen so as to be reciprocally movable. The aim is to provide equipment that is easy to inspect and maintain, and that has low equipment costs.

To explain in detail based on the embodiment shown in the figure, reference numeral 1 denotes a sewage regulating tank having a raw water inflow pipe 2, and overflowing sewage from an overflowing part 1a formed at the upper end of one end is transferred to two branch pipes 3, 3'.
This allows the water to flow down into two rows of water diversion channels 4, 4' which are formed parallel to each other at appropriate intervals.

The water diversion channels 4, 4' are shaped like culverts, and have opposite openings at the upper part of the inner wall and a chevron-shaped overflow part 4a, at the lower edge.
4'a is formed.

Reference numerals 5 and 5' indicate a plurality of slanted screens connected in the horizontal direction, and the lower ends are connected to the above-mentioned water diversion channels 4 and 4'.
It is rotatably supported on the upper end of the side edge of the foreign matter recovery channel opening 6 which extends parallel to the center of the drain, and the upper end is continuous with the outer inclined surface of the overflow parts 4a and 4'a and the screen surface. In addition, each row of screens is supported on the lower end of the inclined surface of the overflow portions 4a, 4'a so as to form the same plane, and both sides of the open channel 6 are provided as open channels 7, 7' for collecting water.

Reference numeral 8 denotes a traveling trolley, and wheels 10 are fixed to both ends of two axles 9 extending in the left-right direction and rotatably supported at the front and rear of the frame 8a, and are fixed to the upper edges of the inner wall openings of the water diversion culverts 4, 4'. I-shaped rail 11,1
Sprocket 13,
14 and an endless chain 15, it is possible to reciprocate by rotating one axle 9.

16a, 16b and 16'a, 16'b are arranged in pairs at appropriate intervals so as to be able to engage with the screen surfaces of the inclined screens 5 and 5', which are installed obliquely at the bottom of the traveling carriage 8, respectively. Motors 17a, 17b and 17' with reducers are equipped with rotating brushes.
a and 17'b so that they can rotate in opposite directions. In this case, the tip of the brush is attached to the vertical support member 5a or 5'a on the back of the screen.
(not shown).

Reference numerals 18 and 18' denote baffle plates extending from both sides of the frame 8a above the overflowing parts 4a and 4'a, and the lower end of the plate slides on the inner slope of the overflowing parts 4a and 4'a when the trolley 8 runs. The rotating brushes 16a, 16 are in contact with each other.
16'a, 16'b are engaged on the inclined screens 5, 5' so as to obstruct the overflow of sewage from the diversion culverts 4, 4'.

Reference numeral 19 denotes a communication pipe that connects the water diversion channel 4 and one end side of the foreign matter recovery open channel 6 in a closable manner; 20 indicates the communication pipe 1;
A pit of a suitable depth is provided on the opposite end of the pit 9, and is equipped with pumps 21a and 21b for discharging foreign matter at the bottom so that it can be discharged to the outside through a discharge pipe 22. It is formed low.

In addition, 23 is a water conduit pipe provided on the side of the water collection open channel 7, and is connected to an aeration tank (not shown) as appropriate.
Further, reference numeral 24 denotes an on-off weir valve which is provided to be capable of shutting off the inside of the overflowing portions 4a and 4'a of each of the screens 5 and 5', and an operating device 25 disposed on the upper surface of the water diversion channels 4 and 4'.
It can be opened and closed by. Further, numeral 26 is a grating which is supported by suitable support pillars on the foreign matter recovery channel 6, and whose upper surface is made so that workers can pass through it for maintenance and inspection.

Therefore, when each weir valve 24 is opened, the diversion culvert 4,
4' flows down from the overflow parts 4a, 4'a toward each inclined screen 5, 5', and the filtered sewage that has passed through the screens is sent to the water conduit 23 from the water collection open conduits 7, 7'. On the other hand, the foreign matter slides down the top of the screen and falls into the open conduit 6 for collecting foreign matter, and the waste water sent from the diversion conduit 4 passes through the communication pipe 19, which is communicated intermittently at appropriate times, into the pit 20. The water is then discharged to the outside through the discharge pipe 22 by operating the discharge pumps 21a and 21b, where it is appropriately dehydrated using a dehydrator or the like.

At the same time, the traveling trolley 8 reciprocates at a slow speed, but at the same time as it moves, the rotating brushes 1 rotate in mutually opposite directions.
6a, 16b, 16'a, and 16'b sequentially remove foreign matter from each screen 5, 5'.

In this case, the support member 5 on the back of the screen
All foreign matters adhering to both sides of a and 5'a are completely removed by the brush 16a or 16'a during the forward movement and the brush 16b or 16'b during the backward movement.

In the above embodiment, the inclined screens were arranged in parallel on both sides, but of course it is also possible to arrange them in parallel on only one side. Also, although the traveling trolley was set to run constantly, it could also be operated intermittently at intervals of time. In this case, it is sufficient to provide an appropriate shelter for the cart.

As detailed above, according to the device of the present invention, the equipment cost can be greatly reduced because a large number of inclined screens can be used for multiple purposes with only one traveling trolley. Not only does it take up less space, but each screen is arranged consecutively, making inspection and maintenance extremely easy.
By reciprocating the set of rotating brushes, both sides of the support member on the back of the screen can be completely cleaned.
It is extremely hygienic with no fear of sewage splashing.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a plan view, FIGS. 2 and 3 are sectional views from A to A and enlarged sectional views from B to B in FIG. 1, and FIGS. They are a C-C sectional view and a D-D sectional view in FIG. 3. In the figure, 4 and 4 are diversion channels, 5 and 5' are inclined screens, 6 is an open channel for collecting foreign objects, 8 is a traveling trolley, and 1
6a, 16b, 16'a, 16'b indicate rotating brushes.

Claims (1)

[Claims] 1. A plurality of inclined screens are arranged in a row in the horizontal direction so that the upper ends are continuous with the overflow part of the water diversion channel from the water source and the screen surfaces form the same plane to provide a common foreign matter collection path. A screen device for sewage treatment, characterized in that a traveling carriage having a set of two rotating brushes that sequentially engage with the screen surface and rotate in opposite directions is disposed above the screen so as to be reciprocally movable. 2. The diversion culverts are arranged in two parallel rows with appropriate spacing, with overflow portions facing inward, the slanted screens are arranged in a V-shape between the two diversion culverts, and the rotating brush is arranged in two parallel rows with appropriate intervals. A screen device for sewage treatment according to claim 1, wherein one set of screen devices is provided on both sides below a single trolley placed in the upper part of the carriage. 3. Both of the screens have a common open channel at the lower center as a foreign matter recovery channel, one end of which can be communicated with the diversion channel as appropriate, and the other end of the open channel with a foreign matter discharge pump installed at the bottom. A screen device for sewage treatment according to claim 2, which communicates with a pit.