JPS643452Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a solid-liquid separator that separates water from solid substances contained in rainwater or wastewater.

Swirl water tanks utilize the principles of solid-liquid separation using gravity-based sedimentation and inertia caused by rotation, and they have excellent solid substance removal capabilities, and their residence time in the tank is short, requiring almost no energy consumption. Because it has many advantages, various studies have been conducted in Japan, and there is an opportunity for it to be installed in public waters.

An example of this swirl water diversion tank is shown in FIGS. 1 and 2. 1 is a cylindrical swirl water tank, 2 is an inlet drain that is provided below the swirl water tank 1 and introduces inflowing rainwater and wastewater containing pollutants (hereinafter referred to as wastewater) into the tank in a tangential direction, 3 is treated water This is a downshaft erected at the center of the swirl water diversion tank 1 to discharge the water. 4 is a water collection basin attached to the top of the downshaft 3, 5 is an overflow weir provided above the periphery of the water collection basin 4, and 6 is an overflow weir formed integrally with the overflow weir 5 below the periphery of the water collection basin 4. The lower surface of the water collection basin 4 and the skirt part 6 form a storage umbrella 7 which is open at the bottom. A scum ring 8 is disposed outside the overflow weir 5 concentrically and at a predetermined interval. Reference numeral 9 denotes a scum trap for collecting water surface suspended matter (hereinafter referred to as scum) and guiding it to the storage umbrella 7. One end is opened between the scum ring 8 and the tank wall 1a, and the other end is connected to the storage umbrella 7. It's open. 10 is a sewage discharge pipe;
11 is a treated water discharge pipe connected to the downshaft 3 at one end.

Next, the operation of the swirl water diversion tank configured as described above will be explained. The wastewater is introduced tangentially from the inflow conduit 2 into the swirl water diversion tank 1, and rises inside the tank 1 while swirling around the downshaft 3, during which time sediments, sedimentary suspended matter, etc. contained in the wastewater are removed. teeth,
It settles due to gravity and inertia, is collected in the center of the tank 1, and is discharged from the sewage discharge pipe 10. The scum floating on the water surface is intercepted and removed by the scum ring 8, and the drainage water from which sedimentary suspended solids, etc. have been removed, passes through the lower edge of the scum ring 8 and passes over the upper edge of the overflow weir 5. The treated water is collected in the water collection basin 4 and discharged from the downshaft 3 to the treated water discharge pipe 11 as treated water.

On the other hand, the scum blocked by the scum ring 8 floats between the scum ring 8 and the tank wall 1a, is collected by the scum trap 9, is drawn into the storage umbrella 7 by the water flow, and is stored in the storage umbrella 7. Ru. When the water level in the tank 1 decreases, this scum collects in the center of the tank 1, is discharged from the sewage discharge pipe 10, and is treated at a final treatment plant.

In this manner, in the conventional swirl water diversion tank, the scum contained in the inflowing water is temporarily stored in the storage umbrella 7, and when the water level in the tank 1 decreases, it is discharged from the wastewater discharge pipe 10, and the scum is discharged from the wastewater. There is no particular problem if the amount of scum contained therein is small. However, when the amount of scum contained in the wastewater increases and exceeds the capacity limit of the storage umbrella 7,
The scum is caught up in the water flow in the tank 1, passes through the lower edge of the skirt portion 6, crosses the upper edge of the overflow weir 5, and mixes into the treated water. As a result, the solid-liquid separation function deteriorates, and the quality of the treated water deteriorates, potentially contaminating public water bodies significantly.

This invention was developed in order to solve the above-mentioned conventional problems, and even when there is a large amount of scum contained in wastewater, it is possible to continuously and efficiently discharge the scum out of the tank. The object of the present invention is to obtain a solid-liquid separator that is free from the possibility of scum being mixed into treated water.

In order to achieve the above object, the solid-liquid separator according to the present invention connects the scum introduction pipe to the end of the scum trap that opens below the water collection basin in the swirl water diversion tank, and connects the lower end to the wastewater discharge pipe. The scum is placed close to and facing the tank, and the scum is continuously discharged out of the tank by utilizing the water flow drawing effect of this scum introduction pipe. The present invention will be explained below using the drawings.

FIG. 3 is a plan view of an embodiment of the present invention, and FIG. 4 is a longitudinal sectional view thereof. Note that parts having the same functions as those in FIGS. 1 and 2 are denoted by the same reference numerals, and explanations thereof will be omitted. 5a is an overflow weir provided at the periphery of the water collection basin 4, but in the present invention, the skirt portion 6 hanging below the periphery of the water collection basin 4 explained in FIG. 2 is omitted; A storage umbrella 7 is also not provided. 12 is a scum outlet pipe made of a round pipe, one end of which is connected to the collection part 9a of the scum trap 9, and the other end connected to the tank opening 1 of the sewage discharge pipe 10.
0a and are placed opposite to each other with a gap g between them. End of scum outlet pipe 12 and opening 1 of sewage discharge pipe 10
According to experimental results, it is desirable that the gap g with respect to 0a is at least twice as large as the expected maximum diameter of the inflowing solids.

In the present invention configured as described above, the scum collected by the scum trap 9 is drawn from the scum outlet pipe 12 into the waste water discharge pipe 10 by the water flow drawing action of the waste water discharge pipe 10, and is discharged together with precipitated substances. processed in the process.

Although the embodiments of the present invention have been described above, the structure, shape, etc. of the swirl water diversion tank and other parts are not limited to the above embodiments, and it goes without saying that they can be changed as appropriate without departing from the gist of the present invention. do not have.

As is clear from the above description, according to the present invention, the scum collected by the scum trap is continuously and efficiently discharged from the scum outlet pipe to the wastewater discharge pipe, so that it is not contained in the treated water. There is no scum mixed in, and therefore there is no risk of contaminating public waters. In addition, the present invention can simplify the structure by simply connecting the scum outlet pipe to the scum trap and omitting the skirt section that was conventionally provided below the outer edge of the water collection basin. In this way, the present invention can be applied to rainwater, sewage, industrial wastewater, etc.
It is highly effective when implemented in all solid-liquid separation equipment for wastewater containing scum.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an example of a conventional swirl water diversion tank, FIG. 2 is a longitudinal sectional view thereof, FIG. 3 is a plan view of an embodiment of the present invention, and FIG. 4 is a longitudinal sectional view thereof. 1: Swirl water tank, 3: Downshaft,
4: Water catchment basin, 5a: Overflow weir, 8: Scum ring,
9: Scum trap, 10: Sewage discharge pipe, 12:
Scum outlet pipe.

Claims (1)

[Scope of utility model registration request] A downshaft installed in the center, a water collection basin attached to the upper end of the downshaft and provided with an overflow weir on the outer edge, and a scum placed concentrically with this on the outside of the water collection basin. In a swirl water diversion tank consisting of a ring, a scum trap having one end opening between the scum ring and the tank wall and having a scum collection part at the other end, and a sewage discharge pipe provided at the bottom,
A solid-liquid separator characterized in that a scum outlet pipe is provided, one end of which is connected to the scum collecting section of the scum trap, and the other end of which is disposed close to the opening of the wastewater discharge pipe.