JPS5855836B2 - Pressure flotation separation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressurized floating type separation device.

A conventional pressurized flotation separator has a mixing tank in which pressurized water and wastewater are mixed.

However, when this was done, coarse air bubbles were generated in the mixing tank, and the air bubbles impacted the floating sludge, causing aeration.

Further, since the mixture flowing out from the mixing tank is in a horizontal direction, the floating sludge is swept away in the opposite direction to the scraping direction, so that the floating sludge cannot be sufficiently scraped off.

As a result, the water quality of the separated liquid deteriorated, and there were drawbacks such as the pressure reducing valve at the outlet of the mixing tank becoming clogged.

This invention was made in order to eliminate such drawbacks, and the flotation tank is divided into a contact chamber and a flotation chamber, and waste water and pressurized water are introduced into the contact chamber in a countercurrent state. It is an object of the present invention to provide a pressurized flotation separation device that eliminates the drawbacks and improves the separation effect.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In FIG. 1, 4 is a flotation tank, and the inside of this flotation tank 4 is divided into a contact chamber 1 and a flotation chamber 2.

A waste water supply pipe 5 and a pressurized water supply pipe 6 are introduced into the contact chamber 1 in a vertically opposed state.

The wastewater supply pipe 5 introduces wastewater via a pump P1,
Discharge downward as shown in Figure 2.

The pressurized water supply pipe 6 introduces pressurized water via the circulation pump P2 and the pressurized tank 7, and discharges it upward as shown in FIG.

In this way, a countercurrent condition is created in the contact chamber 1.

In addition, each pipe may be limited to a single row as shown in FIG. 2, but may be arranged in double rows, or the opposite end of the wastewater supply pipe 50 may be expanded into a skirt shape as shown in FIG.

Furthermore, it is also possible to do as shown in FIG.

In this way, the countercurrent state of each supply water becomes good, and the supply water flows into the flotation chamber 2 in a uniformly distributed manner.

The mixed water that has been sufficiently contacted and mixed in the contact chamber 1 passes over the partition wall 8 and flows into the floating chamber 2 without having any lateral flow force.

The contact chamber 1 performs optimal gas-liquid mixing using the agitation force generated by the velocity energy of waste water and pressurized water, and also shreds coarse air bubbles generated from the pressurized water.

At the same time, the bubble rate is set to 100%, and the generated bubbles are brought into contact with and adhere to the waste water particles, so that the adhesion efficiency is close to 100 (up to 100).

Note that the bubble generation rate of 100% means that the supersaturated dissolved air is 1
00e/e means to form bubbles.

A moderate stirring force is required to turn the dissolved air into fine bubbles, and by increasing the residence time of the pressurized water under such stirring force, the bubbles can be almost completely turned into bubbles.

In the flotation chamber 2, a plurality of baffles 3 are arranged in parallel at the part where wastewater particles float.

Each of these baffles 3 serves to anchor the aggregate of floating particles that have flown into the flotation chamber 2 and floated and separated therebetween to prevent them from being swept away backwards.

Therefore, only the separated liquid flows in the flotation chamber 2 in the direction of the arrow.

The aggregate of floating particles (thickened sludge) above is scraped off by the flight conveyor 9 and collected outside.

At this time, the thickened sludge is moored by each of the baffles 3, so the scraping is complete.

Furthermore, since the water is not washed away, the tank will not be clogged.

The concentration of floating sludge becomes higher when the thickness and height of the floating layer is increased due to greater buoyancy and consolidation.

Each baffle thus serves to increase the thickness.

Therefore, according to this configuration, the concentration of the collected sludge is high.

On the other hand, this means that fine flocs are not entrained in the separated liquid, which lowers the concentration of the separated liquid.

°Therefore, the separation effect is significantly improved.

As described above, according to the present invention, the interior of the flotation tank is divided into a contact chamber and a flotation chamber, and a waste water supply pipe and a pressurized water supply pipe are provided facing each other in the contact chamber, thereby making it possible to achieve sufficient mixing and bubble formation. Moreover, since the flow force in the lateral direction is reduced, the coarse air bubbles are sufficiently shredded, and the floating sludge is no longer washed away.

Therefore, accidents such as tank clogging are eliminated, and the separation effect itself is improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a pressurized flotation separation device according to an embodiment of the present invention, FIG. 2 is an enlarged perspective view of its main parts, and FIG. 3 is a
FIG. 4 is a sectional view of a modification of the main part of the same embodiment, and FIG. 4 is a front view of the modification. 1... Contact chamber, 2... Levitation chamber, 3...
... Baffle, 4... Levitation tank, 5...
...Waste water supply pipe, 6... Pressurized water supply pipe, 8
・・・・・・Partition wall.

Claims (1)

[Claims] 1. A pressurized flotation tank, a contact chamber and a flotation chamber provided separately in this tank, and wastewater supply pipes introduced into the contact chambers and arranged vertically opposite to each other. and a pressurized water supply pipe. 2. The pressurized flotation separation device according to claim 1, wherein a plurality of baffles are arranged in parallel in the longitudinal direction at predetermined intervals in the separated object flotation section of the flotation chamber. 3. Pressurized flotation according to claims 1 and 2, wherein the waste water supply pipe is arranged upward and the pressurized water supply pipe is arranged downward, and the opposing ends of the waste water supply pipe are expanded into a skirt shape. Separation device.