JP3491980B2 - Multi-level sedimentation basin - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer sedimentation basin for treating a large amount of sewage in a narrow space, by operating one flight conveyor on the sedimentation floor of each floor. It is related to a multi-level sedimentation basin where the sludge is swept. 2. Description of the Related Art In a sewage treatment plant, inflowing sewage (sewage) is subjected to solid-liquid separation in advance in a sedimentation basin between a solid component such as sludge and a liquid component of the sewage, and the sludge component and the sewage are then separated. Processed separately in the process. The sedimentation basin that separates the solid and liquid in the sewage has been installed in advance with a capacity corresponding to the amount of inflow sewage, but in recent years it has become difficult to secure a large-area sewage treatment plant site near the city. The sedimentation basin has a multi-level structure on the second or third floor, and a flight conveyor is installed for each floor to collect the settled sludge in the sludge pit and discharge the sludge. [0003] In the conventional multi-layer sedimentation basin, an independent flight conveyor is provided for each floor and the sludge is raked in. Therefore, a take-up device and a driving device are provided for each flight conveyor. In addition to the need, it is necessary to perform maintenance and inspection for each conveyor. In addition, the flight conveyor on the top floor is partly above the water surface, so the operation status of the conveyor can be visually checked by operating the conveyor, but the flight conveyor must always be immersed in the water or be visible The operation status of the flight conveyors on the floors other than the top floor, which cannot be checked, cannot be checked visually, and this inspection requires time and effort. In particular, it is necessary to grasp the flight condition of the flight and flight shoes by using the flight conveyor and sometimes replace it,
For this reason, it is necessary to drain the sewage in the sedimentation basin during maintenance and inspection, which temporarily interrupts the treatment of sewage. An object of the present invention is to operate a single chain type flight conveyor along each floor even in a multi-layered sedimentation basin, thereby simplifying the equipment and simplifying maintenance and inspection. SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and a sludge pit side is provided in a main body of a multi-layered sedimentation tank having a sludge pit at the lowest position on one end side. A set of single-end flight conveyors with one drive unit is provided to arrange the sedimentation ponds of each level that can be opened and conducting, and to stir the sludge settled on the floor of each floor to the sludge pit side. Into a multi-level sedimentation basin
The source of raw water flowing into the main body of the multi-layer settling pond.
The water inlet is on each floor, and the back end of the floor from the sludge pit side
And settled in each sedimentation basin
A scum skimmer and a drain port are protruding underwater
The flight conveyer is separated from the pond by
Drive sprocket driven by the drive installed above
Wheels, the upper position of each floor and the back end of the anti-sludge pit side
Location, and the end of the floor on the side of the sludge pit and
Above the drive sprocket wheel
Ends between guide sprocket wheels
It is stretched like a wrestle, and the flight conveyor is on the top of the floor inside the floor
Rubs the settled sludge to the sludge pit side
The gist is that it is operated as follows. The interior of the sedimentation basin is divided into multiple layers on each floor, and the floors are electrically connected at the end of the sludge pit side, and raw water is allowed to flow in such a manner that sludge settles on each floor. In addition, one endless chain type flight conveyor is stretched and run on the floor so as to sweep the settled sludge toward the sludge pit. This makes the configuration of the sludge scraper 1
The driving device and one take-up device are simplified, and can be easily maintained and managed. In particular, the operation status of the flight conveyor can be visually checked without draining sewage in the pond at the top level, and replacement of flights and flight shoes can be easily performed only by lowering the water level in the pond. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter , a multilevel sedimentation basin of the present invention will be described with reference to the illustrated embodiment. In the figure, reference numeral 1 denotes a multi-layer sedimentation basin of a sewage treatment plant having a predetermined treatment capacity in all ponds, and a sludge pit 2 is formed on the inner bottom surface at one end of the multi-layer sedimentation basin 1 and at the lowest position. At the same time, the inner bottom surface 1a of the sedimentation basin main body is desirably formed into a slope at a predetermined inclination angle so that the sedimentation sludge is easily collected into the sludge pit side. In the main body 1 of the multi-layered sedimentation basin, floors 3a, 3b,... For sludge sedimentation are arranged at predetermined intervals in the vertical direction so that the upper end side of the sludge pit conducts. In the illustrated embodiment, a second floor is provided, and the floor 3a, 3b has an open end opposite to the open end on the sludge pit side as shown in FIG. Is separated from the sedimentation tank B of one or more intermediate layers. The floors 3a and 3b of each level are also inclined so that the sludge pit side is lower. A single chain type flight conveyor 4 is installed in the main body of the multi-layered sedimentation basin so as to be operated along the inner bottom surface 1a of the bottom pond and the floors 3a and 3b. The flight conveyor 4 includes a driving sprocket wheel 6 driven by a driving device 5 installed on a pond,
At the upper position of each floor 3b, 3a, 1a and the back end position on the anti-sludge pit side, and further, at the end position of the sludge pit side of the floors 3a, 3b and the upper part inside the sludge pit, they are disposed below the driving sprocket wheel. Endlessly stretched between the guide sprocket wheels 7, 7,.
A flight conveyor is attached to the upper surface of the inner bottom surface 3b, and the sludge is operated so as to scrape the settled sludge to the sludge pit side. [0010] Of these, one guide sprocket wheel in the uppermost sedimentation basin A is a take-up sprocket wheel 8, which is provided with a take-up device 9, and which stretches the flight conveyor 4 with the set tension. To be done. In each of the sedimentation basins A, B, and C, a floor 1
Raw water inlets 10a, 10b, and 10c are respectively disposed between the flight conveyors 4 that are arranged in parallel above and below the a, 3a, and 3b and above the sludge pit side. From 10a, 10b, 10c, sewage (sewage) flows into each of the sedimentation basins A, B, and C in such a manner as to flow toward the back end of each sedimentation basin. The solid content is settled on each floor by utilizing the water, and only the water is drained out of the pond from the drainage port 11 arranged at the upper end of each hierarchical pond. A scum skimmer 12 for discharging scum floating on the water surface is provided. Therefore, in the sedimentation basin constructed as described above, the raw water inlets 10a, 10b,
10c, sludge of each solid is settled on each floor, water is dispersed and drained from the drain port, and the sludge settled on each floor by driving the flight conveyor 4 is operated. , And fall into the sludge pit 2. At this time, the falling position of the sludge falling into the pit is shifted from the raw water inlet flowing into each of the ponds A, B, and C, so that the sludge falling from the upper floor is also included in the raw water flowing into the lower floor. Is prevented from spreading again. Further, the number of flight conveyors is one even in a multi-layered sedimentation basin, which is stretched and driven by one driving device and a take-up device, so that the device is simplified and the operation is performed in the uppermost sedimentation basin. The status of the flight conveyor can be checked visually. The multi- stage sedimentation basin of the present invention comprises a multi-layer sedimentation basin having a sludge pit at the lowest position on one end side. The sedimentation basin is arranged in a multi-layer system, and the endless flight conveyor is stretched so that the sludge settled on the floor of each floor can be driven by a single drive unit so that it can be driven to the sludge pit side. In addition, the status of the flight conveyor can be visually checked on the top floor, and maintenance and inspection can be easily performed without draining the wastewater in the pond. In addition, it is a multi-layer type, and the settled sludge can be raked into one sludge pit, so that a large amount of raw water can be effectively treated in a narrow space. So that the sludge does not spread again in the lower pond.
And discharges scum floating on the surface of each settling pond
There are a number of advantages, such as being able to .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing an embodiment of a sludge scraper for a multi-level sedimentation tank according to the present invention. [Description of Signs] 1 Multi-layered sedimentation tank main body 1a Inner bottom surface 2 Sludge pit 3a, 3b Floor 4 Flight conveyor 5 Drive unit 6 Drive sprocket wheel 7 Guide sprocket wheel 9 Takeup 10a, 10b, 10c Raw water inlet A Lowermost layer Settling tank B Uppermost settling tank C Intermediate settling tank

Continuation of front page (56) References JP-A-56-78607 (JP, A) JP-A-55-109410 (JP, A) JP-A-59-48708 (JP, U) JP-A-48-15756 (JP, A) , Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) B01D 21/00-21/34

Claims (1)

(57) [Claims 1] In a main body of a multi-layered sedimentation basin having a sludge pit at the lowest position on one end side, a sedimentation basin of each level which is open and capable of conducting with a sludge pit side is provided. In a multi-layer sedimentation basin that is arranged in a multi-layer type and stretched so that one endless flight conveyor can be operated by one driving device so as to scrape the sludge settled on each floor floor to the sludge pit side , multilayer
Each raw water inlet to allow raw water to flow into the main body of
Flow on the floor and from the sludge pit side toward the far end of the floor
And set it in the upper part of the back end of each sedimentation basin.
The scum skimmer and the drain are separated by a partition wall that protrudes into the water.
And set the flight conveyor on a pond.
A driving sprocket wheel driven by a driving device;
The upper position of each floor and the innermost position on the anti-sludge pit side, and
Is at the end of the sludge pit on the floor and in the upper part of the sludge pit.
Each is located below the drive sprocket wheel.
Endless tension between the guide sprocket wheels
A flight conveyor is attached to the upper surface of the floor inside the floor, and
Operates so that the settled sludge is swept toward the sludge pit side
Hierarchical sedimentation, characterized in that the so that.