JP3161274B2 - Wastewater stirring and aeration equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a sewage tank for a building or
The present invention relates to a stirring and aerating apparatus for crushing scum generated in a sewage treatment plant or the like, supplying a water-mixed sewage to the crushed scum, and performing aerobic biological treatment of organic matter.

[0002]

2. Description of the Related Art Conventionally, a stirring blade is provided in a casing having a suction port at an upper portion and a discharge port opened at a side, and an air suction pipe is arranged at a rear end of a rotating shaft of the stirring blade. (For example, Japanese Utility Model Publication No. 4-17273). And
There is also a device in which the above-mentioned stirring and aerating device is disposed so as to be able to move up and down (for example, JP-A-1-218678).

[0003]

However, the above-mentioned stirring aeration apparatus has a preferable shape for sucking the scum, but has a small stirring blade and a conveyer or paddle shape. If the water depth of the suction port of the scum was adjusted, suction and stirring of the scum could be performed, but suction and crushing of the scum could not be sufficiently performed. And
Since the suction power is weak, the suction of air due to the negative pressure is small, and nitrification due to biological treatment of organic substances cannot be performed as expected. The present invention provides a stirring aeration apparatus in which scum is crushed and air suction force is increased by making a stirring blade used in a conventional apparatus a special shape.

[0004]

The gist of the present invention is that a stirring blade is provided in a casing having a suction port on the upper side and a discharge port opened on the side, and an air suction pipe is arranged near the stirring blade. Agitating that can be set up and down along the guide rod
In the machine , a plurality of spiral blades are provided in the horizontal portion of the casing, the periphery of the spiral blade is approached to the inner surface of the casing, and the tip is separated from the rotation axis and projected from the tip of the drive shaft. . Then, it disposed the water level gauge in the stirrer, and a water level gauge and a driving machine for raising and lowering of the agitator is interlocked, by detecting the water level difference between the inlet and the water surface of the stirrer,
It is designed to maintain the optimum water depth.

[0005]

The present invention is constructed as described above, and the scum flowing from the suction port of the casing is crushed at the tip of the spiral blade, and together with the sucked waste water, the spiral scum is arranged in series. It is transported along the blade and the discharge pressure is increased. At the same time, air is sucked from the air suction pipe, mixed with sewage while being stirred by the spiral blades, and discharged from the discharge port of the stirrer. The discharged sewage circulates while agitating the water in the sewage tank, is again sucked by the pump, and crushes the scum and mixes air into the sewage. And the sewage in which the air is dissolved measures the activation of aerobic bacteria, decomposes organic matter,
Easy transfer to the next process. Further, fouling although the water level due to changes in inflow or evacuation of the water tank is moved up and down, to detect the water level between the inlet and the water surface of the agitator by the water level gauge, stirrer <br/> driving machine for raising and lowering the actuating the raises and lowers the agitator to an optimum depth that can be sucked scum.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the accompanying drawings. Reference numeral 1 denotes a stirrer installed in a sewage tank 2, and a casing 3 of the stirrer 1 is formed in an L shape. A funnel-shaped suction port 4 and a discharge port 5 in the lateral direction. A motor 6 is horizontally disposed inside the casing 3, and two spiral blades 9 are wound around a hub 8 at the tip of a drive shaft 7 extending on the inflow side. Then, the peripheral edge of the spiral blade 9 is made to approach the inner surface of the casing 3, and its tip is separated from the rotation axis and protrudes toward the inflow side. The scum that has flowed into the suction port 4 of the stirrer 1 is finely crushed at the tip of the spiral wing 9, and the inflowing sewage is pushed out and accelerated on a series of swirling spiral blade surfaces to be discharged. It has become. Reference numeral 10 denotes an air suction pipe erected on the casing 3 in the vicinity of the peripheral edge of the spiral wing 9, and air is sucked by an ejector action generated by rotation of the spiral wing 9, mixed with sewage, and crushed. The gas-liquid mixed sewage is discharged into the sewage tank 2 together with the generated scum.

Reference numeral 11 denotes a guide rod, and the stirrer 1 is suspended from a screw shaft 12 suspended from the guide rod 11. A driving device 13 for rotating the screw shaft 12 is provided above the screw shaft 12.
When the rotation direction 3 is reversed, the stirrer 1 moves up and down along the guide rod 11. Reference numeral 14 denotes a water level gauge provided in the sewage tank 2, and the water level gauge 14 and the driving device 13 are interlocked with each other. The depth of the water level meter 14 is detected, and the driving device 13 is operated. The water depth of the stirrer 1 is corrected to a desired water depth. That is, assuming that the set water depth of the water level gauge 14 is L and the set water depth of the suction port 4 of the stirrer 1 most preferable for sucking the scum floating on the water surface into the stirrer 1 is L0 , the water level rises and the water level gauge increases. When the sensor 14 detects the water depth of L + L1, the drive unit 13 may be operated to raise the stirrer 1 by L1. When the water level is lowered and the sensor of the water level gauge 14 detects the water level of L-L1, the stirrer 1 is lowered by L1 so that the scum floating on the water surface of the sewage tank 2 can be sucked into the stirrer 1 most easily. It is made to become.

[0008]

The present invention is configured as described above,
The scum can be crushed and the air can be mixed with the sewage well. That is, in the conventional apparatus, since the stirring blade of the stirrer has a screw shape or a paddle shape, the suction force is weak, and the suction of the scum and the ejector function of the air suction pipe are not sufficiently performed. However, according to the present invention, the stirring blade is a spiral blade, the periphery of which is made to approach the inner surface of the casing of the stirrer, and the tip of the stirring blade is separated from the rotation axis and projected toward the suction side. As a result, the suction force of the air increases, the circulation of the waste water in the waste water tank is promoted, and the scum can be crushed finely. In addition, since the suction port of the stirrer can always be set at a water depth at which the scum on the water surface can be easily sucked, the suction power of the scum can be satisfactorily achieved, and the organic substances are nitrified by the activated aerobic bacteria, and And the transfer to the next step becomes easy.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a stirring aeration apparatus for waste water according to the present invention.

FIG. 2 is a front view of the stirring aeration apparatus taken along line AA of FIG. 1;

[Explanation of symbols]

REFERENCE SIGNS LIST 1 stirrer 2 sewage tank 3 casing 4 suction port 5 discharge port 9 spiral blade 10 air suction pipe 11 guide rod 13 drive unit 14 water level gauge

Claims (2)

(57) [Claims] 1. A suction port 4 is provided at an upper part, and a discharge port 5 is provided at a side.
A stirring blade is provided in a casing 3 having an opening, and an air suction pipe 10 is disposed in the vicinity of the stirring blade, and a stirrer 1 which can be moved up and down along a guide rod 11 is provided at a horizontal portion of the casing 3. A plurality of spiral blades 9 are provided,
A stirring and aeration device for sewage, characterized in that its periphery is made to approach the inner surface of the casing 3 and its tip is made to protrude in the suction direction while being separated from the rotation axis. 2. A sewage 2 the water level gauge 14 is disposed in, the water level gauge 14 and is interlocked with a drive motor 13 for raising and lowering of the agitator 1, the water level difference between the suction port 4 and the water surface of the agitator 1 Is detected,
The sewage aeration apparatus for sewage according to claim 1, wherein the apparatus maintains the optimum water depth.