JPS60193592A - Aeration apparatus for water treatment - Google Patents

Abstract

PURPOSE:To keep the water temp. at about 40 deg.C and to carry out water treatment efficiently at low cost by arranging a disperser in a treating vessel above the water surface in an aeration vessel so that the sprinkled water from the impact surface may fall into the aeration vessel. CONSTITUTION:The discharge port 2a of a pipeline 2 equipped with a pump P whose suction side is connected to the lower part of a hermetic aeration vessel 1 is arranged downward above the water surface W in the aeration vessel 1, and an ejector 4 for sucking external air from an air sucking passage 3 equipped with a flow rate control valve V by the flow of water is provided to the pipeline 2 to pump up and discharge the treated water and sludge wherein the air is mixed from the aeration tank 1 by the ejector 4 into the upper part of the aeration vessel 1. A disperser 5 to be struck by the treated water from the discharge port 2a is arranged at the upper part in the aeration vessel 1 so that the impact surface 5a may be positioned above the water surface W in the aeration vessel 1, and the sprinkled water from the impact surface 5a is allowed to fall on the water surface W in the aeration vessel 1 as fine water droplets.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a pipe with a pump for pumping and discharging treated water and activated sludge in the aeration tank above the water surface in the aeration tank, and supplies oxygen-containing gas to the pipe. This invention relates to improvement of an aeration device equipped with an air supply device.

Conventionally, as shown in Fig. 6, the treated water discharged from -Fl & (2) is made to collide with the water 11ii (5) in the aeration tank ill, and the oxygen-containing gas from the air supply device (4) is released as much as possible. In order to increase the rate of oxygen supply, the researchers tried to keep the water in water for a long time to increase the rate of oxygen supply. However, when the treated water from the pipe (2) collides with the water level, it entrains the surrounding air and foams violently above the water level. It had the disadvantage that it could be contaminated. Also, aeration tank (1)
Since the heat generated by the biological reactions in the water is only carried away by the aeration exhaust gas, large amounts of highly concentrated denatured organic wastewater are used, especially in the summer.
If a refrigerator is installed in the aeration tank (11), the water temperature in the aeration tank (1) becomes too high, which tends to slow down the activity of activated sludge. However, there were drawbacks that put it at a disadvantage.

The object of the present invention is to sufficiently increase the oxygen supply rate while
The aim is to sufficiently suppress foaming and water temperature rise in the aeration tank.

The characteristic configuration of the aeration device according to the present invention is that activated sludge is pumped together from the aeration tank, and treated water discharged from a pipe with a pump is collided with oxygen-containing gas from the air supply device. The effect is that the dispersing device is arranged so that its collision surface is located above the water surface in the aeration tank, and so that the water scattered from the collision surface falls into the aeration tank. It is as follows.

By colliding the treated water with a dispersion tool and scattering it as fine water droplets, the undissolved gas in the treated water and bubbles of nitrogen gas, carbon dioxide gas, etc. attached to the activated sludge are thoroughly removed from the treated water. In addition to being able to release water, sufficient oxygen absorption and heat radiation from the water droplet surface can be performed as the water droplets scatter, and furthermore, the impact energy of the water droplets on the water surface can be sufficiently reduced.

Therefore, the introduction of excess air bubbles and the entrainment of gas on the water surface can be sufficiently suppressed, and bubbling in the aeration tank can be effectively prevented, allowing good operation.

In addition, by heat radiation from water droplets, even if a large amount of Kounohiro organic wastewater is treated in the summer, the water temperature in the aeration tank can be kept at around 40℃ or less without the need for a special refrigerator. It has become possible to maintain water within a range suitable for activities, and to perform good water treatment at low cost.

Of course, the oxygen supply rate can also be made sufficiently large, and it was experimentally confirmed that the amount of oxygen absorbed per liter of circulating water was 0.08 in the conventional device, whereas in the device of the present invention, the amount of oxygen absorbed per liter of circulating water was f″.
i(),05)f, and it was found that the oxygen supply rate was further increased and the high-load processing performance was also excellent. - In short, we have now been able to provide an extremely excellent overall aeration system that has high performance, fewer troubles, and is more economical.

Next, an example will be shown in FIG.

Pump i with the suction side connected to the bottom of the closed aeration tank fi+
The discharge port (2a) of the pipe line (2) with PI is arranged downward above the water surface 6 in the aeration tank (11), and the ejector sucks the outside air from the intake line (3) with flow rate adjustment valve M by water flow. (
4) is provided in the pipe t21K, and the treated water and activated sludge from the aeration tank 11 + force are pumped and discharged to the upper part of the aeration tank (1) with air mixed in by the ejector (4). It is.

Dispersion cooperator (5) that collides the treated water from the discharge port (2a)
is arranged in the upper part of the aeration tank 11+ so that its collision surface (5a) is located at the upper blade of the water surface in the aeration tank f, 11,
Collision surface (5a) that has turned into minute water droplets Splashing water force (
It is configured so that it disperses and falls on the water surface side in the aeration tank (1),
This allows for defoaming and cooling of the treated water.

An outside air introduction path (6) and a gasket (8) with a cedar blower (7) are connected to the upper part of the aeration tank fl+, so that odor deodorization processing and concentrated release can be performed.

Next, another example will be shown.

The aeration tank fi+ may be formed into an open top type as shown in FIGS. 2 and 5.

The gas supplied to the pipe line (2) may be, for example, oxygen-enriched air, pure oxygen, or others, and in short, any gas containing oxygen may be used. In addition, as shown in Fig. 8 and Fig. 4, the farm feeder (9) is used to produce pipes w! The ion-containing gas may be forced into the air supply system [41, tel.

The arrangement and shape of the disperser (6) and the configuration of its dragon can be changed as appropriate. For example, as shown in FIG. 2, the disperser (5) is aerated to scatter water droplets all around it.

A dispersing device may be placed at the center of the tank (1), or above the E-direction outlet (2a) so that the water droplets are dispersed and dropped over the entire water surface, as shown in Figures 8 and 4. (5), dispersion J, f5 + motor 1M to promote the miniaturization of water droplets, as shown in Fig. 4 and 51ffi.
It is possible to use a device that is driven and rotated by a motor.

The treated water may be human waste, highly concentrated organic industrial wastewater, sewage, or any other source.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing an embodiment of the present invention, and FIGS. 2 to 5 are schematic cross-sectional views showing different embodiments of the present invention. Figure @6 is a schematic cross-sectional view of a conventional example. (1)...Aeration tank, (2)...Pipe line,
+411 +91... Air supply device, (6)...
... Dispersion tool, (5a) ... Collision surface, (P)
...Pump, water surface. Agent Patent Attorney Osamu Kitamura Figure 1 Figure 2 Figure A3

Claims (1)

[Claims] ■ A pump (pipe line (2) with Pl is provided, which pumps and discharges the treated water and activated sludge in the aeration tank +11 above the water level in the aeration tank fil, and the pipe line (2) The aeration device is equipped with an air supply device +41', 191 for supplying oxygen-containing gas to the pipe line (2), and a dispersion device (6) for colliding the treated water discharged from the pipe (2) with its colliding surface (5a). ) is located above the water surface (a) in the aeration tank [11], and the water splashed from the collision surface (5a) falls into the aeration tank (1). Aeration device for treatment. (1) The device according to claim 0, wherein the dispersing tool (6) is driven and rotated.