JPS6087Y2 - Multi-stage precipitation device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a multi-stage sedimentation device, and the gist of this invention is that in a rectangular settling tank equipped with a sludge scraper, Sedimentation beds are provided in multiple stages in the water depth direction on a frame supported by the side walls of the sedimentation tank between the side flights, and a rotating shaft is provided passing through the center of each stage sedimentation bed. A scraper is provided to scrape up the sludge on the floor, and the shaft is driven. Furthermore, each stage of the settling bed is provided with a sludge falling port in the radial direction, and the scraper driven by this scraper drives the shaft. The sedimented sludge that has settled and been scraped up is allowed to fall sequentially from the sludge drop port onto the lower sedimentation bed, and finally onto the bottom of the settling tank, where it is collected into the sludge hopper by the flights on the scraping side. The present invention is characterized in that sludge in wastewater is efficiently settled and removed.

The present invention will be explained below based on the illustrated embodiments.

In the figure, 1 is a rectangular settling tank, from which sewage (raw water) flows from one end.
A flight type sludge scraper 2 is installed in the pond.

This sludge scraping machine is a conventional one, and Flight 2a is an endless chain that connects the scraping side that scrapes the sludge that has settled on the pond bottom to the sludge collection hopper H side along the pond bottom, and the return side that moves the water surface position. It is arranged in a loop shape.

3 in the figure shows a multi-stage settling device, which is supported by a frame 4 projecting from the side wall 1a of the settling tank and located between both flights on the scraping side and the return side of the sludge scraper. be done.

The frame 4 supports the sedimentation beds 5 arranged in multiple stages at required pitch intervals in the water depth direction. In this case, the multi-stage sedimentation beds 5 are arranged and supported in the frame 4 in two or more rows in the horizontal direction, that is, in the direction orthogonal to the water flow direction. They are supported in parallel and integrally on a frame.

A rotating shaft 6 is passed through the center of each multi-stage sedimentation bed,
It is rotated by a drive device 7 installed above the water surface, and in the illustrated embodiment, a sprocket wheel 7a attached to the upper end of the shaft is driven by a chino 7c from a prime mover 1b installed on the frame or side wall.

In addition, when two or more rows of multi-stage sedimentation beds are arranged in parallel in the horizontal direction on the same frame, it is also possible to connect each drive shaft with a chino etc. and drive them synchronously.

In addition, the settling bed has sludge falling ports 8 in the radial direction from the center.
At the same time, a scraper is placed on each stage of the sedimentation bed, and the inner end of this scraper 9 is fixed to the rotating shaft 6, whereby the rotation of the rotating shaft causes the scraper 9 to rotate over the sedimentation bed, and the scraper 9 is placed on the sedimentation bed. The collected sludge is collected and allowed to fall onto the lower sedimentation bed from the sludge drop port.

By doing this one after another, the sludge is finally allowed to fall onto the bottom of the settling tank.

In this way, the sludge scraped off from the multi-stage sedimentation bed and the sludge that has settled on the pond bottom are both transported to the sludge hopper H side by the flight of the sludge scraper driven inside the rectangular sedimentation tank, and also by the flight on the scraping side. Sludge is collected and drained.

The above-mentioned multi-stage sedimentation device is one in which two or three or more stages or only one stage are installed in the sedimentation basin in the direction of water flow.

According to the present invention, one or more multi-stage settling beds are installed in the rectangular settling tank so as not to interfere with the flight operation of the sludge scraper, and the sludge settled on the multi-stage settling beds is sequentially transferred to the lower stage. The sludge is allowed to fall and is finally scraped off with a scraper on the bottom of the pond, and the sludge that settles naturally is collected in a scraping flight, so it can also be used in an existing sedimentation tank, and the flow is rectified by a multi-stage sedimentation bed. The effect is improved and the sedimentation area can be increased, which improves the sedimentation removal rate of sludge.Furthermore, since there are flights above and below the multi-stage sedimentation device, the sewage is blocked by the flights and the multi-stage sedimentation device Most of the sludge flows between each sedimentation bed, making efficient use of the functions of the sedimentation beds, which has the advantage of allowing efficient sludge removal even in a small sedimentation tank.

[Brief explanation of drawings]

FIG. 1 is an explanatory external view, FIG. 2 is a schematic front view, and FIG. 3 is a longitudinal side view. 1... Rectangular sedimentation tank, 1a... Side wall, 2
...Sludge scraper, 2a...Flight,
3... Multi-stage settling device, 4... Frame, 5... Sedimentation bed, 6... Rotating shaft, 7...
...Drive device, butt...Sludge fall port, 9...
...Scraper, H...Sludge hopper.

Claims (1)

[Scope of utility model registration request] In a rectangular settling tank equipped with a sludge scraper, a settling bed is placed in multiple stages in the water depth direction on a frame supported by the settling tank side wall between the flights on the scraping side and the return side of the sludge scraper. At the same time, a rotating shaft is provided passing through the center of each stage of sedimentation bed, and a scraper for scraping up the sludge on each stage of sedimentation bed is protruded from this rotating shaft, and the shaft is driven. A multi-stage sedimentation device with sludge drop ports installed in the radial direction of the floor.