JPS5837494Y2 - flotation concentrator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a circular flotation concentration device for flotation concentration of slurry, etc. generated in the treatment of sewage and other wastewater.

Conventionally, in a circular pressurized flotation concentrator, the mixed liquid of surano and gas-dissolved pressurized water flows from the bottom near the center of the tank and flows from the center toward the tank peripheral wall, so the radial distance from the tank center to the tank peripheral wall is Because of the short length, the mixed liquid flowing in from the blowout point did not float uniformly, and the floss layer became thinner at the center and thicker at the peripheral wall of the tank, which also caused problems in scraping off the floss.

The purpose of the present invention is to eliminate these conventional drawbacks and provide a device that efficiently performs flotation concentration of sludge with a simple configuration and low cost, and also to provide a device that can easily modify an existing circular flotation concentration device. That is.

The present invention provides a circular flotation concentration tank equipped with a rotating floss scraper, in which a central chamber is formed near the center of the tank by a partition wall whose upper end reaches above the water surface and whose lower end reaches the bottom of the tank. At least one operation chamber, flotation concentration chamber, and separating ice chamber are installed in the circumferential direction between the tank circumferential wall and a plurality of partition walls whose upper ends are below the water surface or within the floss and whose lower ends reach the tank bottom; A lid wall is provided above each of the operation chamber and the separating ice chamber, one of these chambers is formed under the water surface or in the floss, and the flotation concentration chamber and the separating ice chamber are bored in the partition wall that partitions the one chamber. A liquid mixture inflow pipe of raw slurry and gas-dissolved pressurized water to the flotation concentration chamber is provided in the operation chamber, and a treated water outflow pipe is provided in the separating ice chamber. It is.

An embodiment of the present invention will be described with reference to the drawings. Near the center of a circular flotation concentration tank 1, there is an annular partition wall 2 concentrically with the iron tank 1, the upper end of which protrudes above the water surface and the lower end of which reaches the bottom of the tank. I
A plurality of partition walls 3, 3t, 3tt are formed between the partition wall 2 and the tank peripheral wall, the upper end of which is below the water surface or within the floss layer, and the lower end of which reaches the tank bottom.

3'''... are arranged radially, and at least one operation chamber (I), a flotation concentration chamber (III), and a separated water chamber (IV) are sequentially formed in the circumferential direction.

In this embodiment, as shown in the first illustrated example, an operation chamber II and a separated ice chamber IV are formed at opposing positions with a central chamber Chambers III and III' are formed.

At the upper part of the operation chamber II and the separation water chamber IV, there are lid walls 4 and 4' below the water surface or in the floss layer, respectively, and partition walls 3 and 3''.
Separated water outflow valves v, v' are provided in partition walls 3', 37/ which are provided in series with ', 3', and 3'' and partition the floating concentration chambers III, III' and the separated ice chamber IV. Attached water collection pipes 5, 5' are provided, and in order to prevent the froth from being collected together with the separated water, the lid wall 4' projects into the flotation concentration chambers III, III', and the water collection pipes 5, 5' are provided. ′
The floating concentration chambers III and III
' and the separated ice chamber IV are in communication.

Further, in the operation chamber II, a mixing section of raw slurry IJ 6, 6' and gas-dissolved pressurized water 7, 7' is provided with partition walls 3, 3/3 that partition the operation chamber II and the flotation concentration chambers HI, III'.
The mixed liquid inflow pipes 8, 8' from the mixing section are opened and connected from the partition wall 3゜3''' to the flotation concentration chambers III, III', respectively; The flotation concentration chambers III, III' have a partition wall 3.311/ that partitions the operation chamber II and the flotation concentration chambers III, III';
3''' is provided with rectifying walls 9, 9' at right angles to prevent a short circuit in the water flow, and a separated water outflow pipe 10 is connected to the tank peripheral wall in an open manner to the separated water NIV. .

Furthermore, a floss scraper 11 having a blade 11' or a rotor, a screw, etc. is rotatably provided in the upper part of the tank 1 so as to pass above the lid walls 4, 4'.
The scraped floss is discharged to a floss discharge gutter 12 provided inside.

In addition, operation chamber II, flotation concentration chamber II1. Separated water chamber IV includes, in addition to those shown in this example, operation chamber ■I and flotation concentration chamber II.
I. A plurality of sets of separated water chambers IV are formed as one set in the circumferential direction, and a mixed liquid inflow pipe is connected to each operation chamber II, and a separated water outflow pipe 10 is connected to each separated ice chamber IV. In any case, at least an operation chamber ■■, a flotation concentration chamber II1. The separate ice chambers IV may be formed one by one as appropriate.

Further, the floss discharge gutter 12 may be provided on the peripheral wall of the tank instead of inside the central chamber (2), and it is convenient for maintenance and inspection if a door or the like is provided between the operation chamber II and the central chamber (2) so that they can be accessed.

In the figure, 13 is a froth pit j4, 14' is an overflow pipe, 15.15' is a separated water outflow valve, 16 is a drainage tank, and 17
18 and 18' are drain pipes, and 19 is a central bearing with a power supply slip ring installed as required.

20 is a floss pipe, 21 and 22 are pumps, 23 is a drainage pit, and II' is an extension of the operating room, which allows the room to be made wider.

24 is a control valve for adjusting the water level, and 28.28' is a mixer.

Thus, the mixed liquid of the raw slurry 6, 6' and the gas-dissolved pressurized water 7, 7' mixed near the partition walls 3, 3/// in the operation chamber II flows into the respective flotation concentration chambers III, III'.
From the mixed liquid inlet pipes 8, 8' opened to the floating concentration chamber II
I and III', the air bubbles adhere to the floating substances and float to form a floss layer, and the separated water passes through the collection pipes 5 and 5' and is collected in the separation water chamber IV, where it is sent to the separated water outflow pipe 10. The floss that flows out of the system and floats to the surface is scraped off by a floss scraper 11 and passed through a floss discharge gutter 12 to a floss pit 1.
However, since the operation chamber I and the separating ice chamber IV are formed below the water surface, they rotate and scrape off the floss in the same way as the floss scraper installed in a conventional circular flotation concentration tank. be able to.

In the present invention, at least one operation chamber, flotation concentration chamber, and separating ice chamber are sequentially arranged in the circumferential direction using a plurality of partition walls, and a lid wall is disposed above each of the operation chamber and the separating ice chamber. One of these chambers is formed below the water surface, and the flotation concentration chamber and the separation ice chamber are connected to each other, and a mixed liquid inflow pipe of raw slurry and gas-dissolved pressurized water to the flotation concentration chamber is connected to the operation chamber for flotation concentration. By opening toward the chamber, the distance from the blowout point in the tank of the mixture of raw slurry and gas-dissolved pressurized water to the outlet of the separated water can be increased, allowing the floss layer to float uniformly in the tank. The flotation concentration process can be carried out efficiently, and the froth scraping can be done efficiently.Moreover, it is extremely easy to modify the conventional circular flotation concentration tank by forming the operation room and separating ice chamber under the water surface using a partition wall and a lid wall. It can be easily modified.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a plan view, Fig. 2 is a longitudinal sectional view taken along the line A-A in Fig. 1, and Fig. 3 is a longitudinal sectional view showing a separated ice chamber. be. 1...Floating concentration tank, 2...Partition wall, 3,
3', 3'', 3'''...Partition wall, 4,4'...
...Lid wall, 5,5'... Water collection pipe, 6,6'
... Raw slurry, 7,7'... Gas dissolved pressurized water, 8,8'... Mixed liquid inlet pipe, 9,9'
..., rectifying wall, 10 ... separated water outflow pipe, 11 ... floss scraper, 12 ... floss discharge gutter.

Claims (1)

[Claims for Utility Model Registration] ■0 A central chamber is formed near the center of a circular flotation concentration tank by a partition wall whose upper end is above the water surface and whose lower end reaches the bottom of the tank, and the upper end extends between the partition wall and the tank peripheral wall. At least one operation chamber, a flotation concentration chamber, and a separating ice chamber are arranged circumferentially by a plurality of partition walls whose lower ends reach the bottom of the tank under the water surface or in the floss, and the operation chamber and the separating ice chamber are arranged in sequence in the circumferential direction. A cover wall is installed on the top of each of the two units, and these two units are placed under the water surface, and the flotation concentration chamber and the separation ice chamber are communicated, and the raw slurry and gas-dissolved pressurized water to the flotation concentration chamber are supplied to the operation chamber. A flotation concentrator comprising: a mixed liquid inlet pipe opened toward the flotation concentrator chamber, and a treated water outflow pipe provided in the separated ice chamber. 26. The utility model registration claim 1, wherein the operation chamber is formed at a position facing the separating ice chamber and the central chamber, and a flotation concentration chamber is formed between the operation chamber and the separating ice chamber. equipment. 3. The operation chamber, flotation concentration chamber, and separation ice chamber are set as one set,
The device according to claim 1, wherein a plurality of sets of these are sequentially formed in the circumferential direction. 4. The lid wall forming the separated ice chamber projects the flotation concentration chamber side into the flotation concentration chamber and hangs down to the lower part of the communication port. Claims 1 and 2 The device according to paragraph 3 or paragraph 3. 5. The flotation concentration chamber has a rectifying wall disposed on the central chamber side of a partition wall that partitions the operation chamber and the flotation concentration chamber, and is substantially perpendicular to the partition wall. The device according to item 1, item 2, item 3, or item 4. 6. Utility model registration Claims 1, 2, and 3, wherein the partition wall that separates the flotation concentration chamber and the separated ice chamber communicates the two units through a water collection pipe with a separated water outflow valve. , the apparatus according to item 4 or 5.