JPS5917437Y2 - floating separator - Google Patents

Description

[Detailed description of the invention] This invention collects suspended sludge in a flotation separation tank.
l) Regarding the flotation separator in which the collection member is installed so that it can be driven and rotated freely around the vertical axis, a simple improvement is possible. The purpose is to simplify the support structure and to be able to recover sludge with stable properties even if the level of treated water in the tank fluctuates.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

A bottomed cylindrical body 1 and an internal cylindrical body 2 form a downward flow path A and an upward flow path B that communicate with each other in the deep part. At the same time, a flow path C equipped with a pump P is connected from the separation tank 4 to the descending flow path A, and the first floating separation device 3 and a second separation device described later are connected. Device 5
A combined return pipe 6 for separated and recovered sludge, a supply pipe 7 for oxygen-containing gas, and a supply pipe 8 for water to be treated such as various industrial wastewater.
are connected to the upper side of the descending flow path A, respectively, so that the activated sludge-containing treated water is transferred from the descending flow path A to the ascending flow path B.
and pump flow path C, and in the descending flow path A, oxygen-containing force is dissolved in the water to be treated, thereby effectively improving pollution indicators such as biochemical oxygen demand due to activated sludge. This is a deep-tank aeration-type water treatment device that is capable of efficiently flocculating sludge by bubbling the dissolved gas in the ascending flow path B.

To configure the first flotation separation device 3, the inner cylinder 2 and the flotation separation tank 4 are formed in a concentric circular shape in a plan view, and the cylinder 2 has upper and lower parts concentric with it. A cylindrical body 9 rotatable around the axis is placed on a rail 10 and fitted onto the rail 10, an annular rack is attached to the cylindrical body 9, and a pinion that engages with the rack is provided on the motor M,
The cylindrical body 9 is driven to rotate, and two members 11 are provided on the lower side of the cylindrical body 9 to advance the rotational phase on the side away from the center of rotation in the radial direction of rotation.
．． 11 are disposed in parallel with the cylindrical body 9 at left-right symmetrical positions, and a flat recovery member 12 for scraping up suspended sludge in the separation tank 4 is connected to the rod 21 attached thereto. Rod insertion cylinder 2 attached to the connecting member 11
2, the collecting member 12 is attached to the connecting member 11 so as to be movable up and down along the connecting member 11;
Floating bodies 23, 23 that float on the treated water in the separation tank are attached to the rear side in the rotational direction of each, and the lower edge of the collection member 12 is placed in the suspended sludge layer with high concentration regardless of fluctuations in the level of the treated water. At the same time, the collection part 13 which takes in the scraped sludge in an overflow state around the cylindrical body circumference on the rotation center side with respect to the collection member 12 is suspended in the treated water. 3; The floating body a is constructed of a weir 13a provided at intervals in the circumferential direction and a container 13b in which the weir 13a is fitted so as to be able to rise and fall freely, and the inclination scratch caused by the rotation of the collection member 12 rotating in a floating state is provided. Due to the feeding action of the bringing surface S toward the rotation center, high-concentration suspended sludge is scraped and taken out to the collection section 13 regardless of fluctuations in the treated water level, and a part of the collected sludge is transferred to the return pipe. 6 and the remaining portion is pumped to a processing device 14 such as an autolysis device using a pump P1.

Although it is preferable in terms of balance to provide two collection members 12, it is also possible to provide one collection member.

The second separation device 5 includes a treated water outlet pipe 1
5 is connected to the separation tank 16, a scraping and recovery device 17, 18 for floating sludge and settled sludge is provided, and a part of the collected sludge is sent to the return pipe 6, and the remaining part is pumped to the treatment device 14 by a pump P2. and clean water outlet pipe 1.
A trough 20 to which 9 is connected is connected to the separation tank 16.

Incidentally, the feeding surface S of the collecting member 12 may be curved toward the rear in the rotational direction, as shown by the imaginary line in FIG.
In these structures, the direction of rotation of the recovery member 12 may be reversed and the sludge recovery section 13 may be provided on the peripheral wall side of the separation tank 4, or the recovery member 12 may be provided in the direction of the rotation radius and its A sludge recovery structure may be adopted in which a gutter-shaped recovery section 13 is provided extending from the center of rotation of the member 12 to the peripheral wall of the separation tank.

Further, the second separation device 5 may be equipped with a rotary suspended sludge recovery structure, and various separation devices can be selected.

In summary, the present invention is characterized in that, in the above-mentioned flotation separation device, the recovery member is provided so as to be movable up and down, and the recovery member is supported by a floating body floating on the treated water in the flotation separation tank. .

That is, by supporting the collection member in a floating state, the support structure for mounting it on the rotating member can be simplified, and the structure itself can be made lighter and smaller. Since the position can be maintained constant regardless of fluctuations in the treated water level, compared to a structure in which the collection member is fixedly installed and it unnecessarily enters the floating sludge layer, it is possible to reduce the amount of high-concentration sludge and low-concentration sludge. It is now possible to collect sludge with stable properties without disturbing the sludge.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the flotation separator according to the present invention, in which Fig. 1 is a schematic overall vertical sectional side view of the water treatment apparatus, Fig. 2 is a schematic plan view of the flotation separator, and Fig. 3 is a recovery Attachment of parts is a detailed view of the support structure. 4...Floating separation tank, 12...Recovery member, 23...Floating body.

Claims (1)

[Scope of utility model registration request] Collection member 1 for collecting floating sludge in the floating separation tank 4
2 is provided so as to be freely driven and rotatable around the vertical axis, and the collection member 12 is provided so as to be freely raised and lowered, and the collection member 12 is moved by a floating body 23 floating on the treated water in the floating separation tank 4. A floating separation device characterized by supporting.