JPH1043503A - Oil separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To separate and remove the oil in waste water with a simple device by introducing the waste water rich in oil into an oil recovery tank from an oil recovery pipe, separating oil and water therein and discharging the water close to the bottom from a water discharge pipe. SOLUTION: An oil separator 1 is set in the oil-contg. waste water 3 in a grease trap. The inlet 9 at the upper end of a suction pipe 7 is provided near the surface of the waste water 3, and the waste water 3 is introduced into the suction pipe 7 from the inlet 9. When compressed air is forced into a lifting pipe 8 from an air pipe 13 under such conditions, the waste water 3 is sent upward in the lifting pipe 8 and injected into an oil recovery tank 2 from an injection port 12 and separated therein into water 3a and oil 3b, and the oil 3b is floated on the water 3a. When the surface of the waste water 3 in the tank 2 becomes higher than the upper opening of a water discharge pipe 5, the waste water 3 at the bottom of the tank is allowed to overflow and discharged. The oil in the waste water is concentrated by such a simple device and efficiently discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for separating and recovering oil from grease traps installed in a commercial kitchen or the like.

[0002]

2. Description of the Related Art Conventionally, in kitchens such as hotels, inns, and restaurants, school facilities, school lunch facilities, food processing factories, and the like, a large amount of wastewater containing oil is generated, and the wastewater is discharged as it is. Then, it becomes an obstacle to water treatment in the terminal treatment plant, and also causes deterioration of water quality of rivers and the like.

[0003] Therefore, in many areas, grease traps are installed in facilities such as kitchens that generate oily wastewater,
It is mandatory to prevent oil from being discharged into wastewater.

[0004]

However, in these grease traps, oil is accumulated on the liquid surface,
If this is left untreated, the oil will solidify to form an oil ball,
In addition, problems such as the decay of the oil and the generation of offensive odors occur. And it was a tedious and messy operation.

Therefore, various devices have been proposed as devices for recovering the oil in the grease trap. For example, Japanese Unexamined Patent Publication Nos. 59-228987 and 7-3876 disclose such a structure, but the structure is complicated and expensive, and it is not suitable for application to a small-scale kitchen or the like.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a grease trap which can separate oil in drainage with a simple device and can easily remove the separated oil. It is an object of the present invention to provide an oil separation device for installation.

[0007]

According to the present invention, there is provided an oil recovery tank which is installed so that at least a part of the oil recovery tank is located on the surface of the drainage water, an opening on an upper side surface of the oil recovery tank, and a tip of the oil recovery tank. A substantially U-shaped water discharge pipe reaching the vicinity of the bottom in the oil recovery tank, and a substantially U including a suction pipe and a pumping pipe
An oil recovery pipe having a V-shape, having an inlet at the tip of the pumping pipe, which fits into a receiving port at the upper part of the oil recovery tank, and forming a suction port at the tip of the suction pipe, which opens near the drainage water surface; It is characterized by comprising an air supply pipe connected to the lower part of the pumping pipe.

In the present invention, it is preferable that a notch is formed at the edge of the suction port of the oil recovery pipe. In addition, it is preferable to provide a substantially inverted U-shaped injection member that is extendable and contractable with respect to the pumping pipe in the pumping pipe of the oil recovery pipe.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. The drawing shows an oil separation device 1 of the present invention. Reference numeral 2 denotes an oil recovery tank, which is formed by blow-molding a plastic such as polyethylene, is installed in a grease trap, and its upper part is exposed above the water surface.

In the upper part of the oil recovery tank 2, a receiving port 4 is provided.
Is formed, and a substantially L-shaped water discharge pipe 5 is formed on the side surface.
Is installed. The water discharge pipe 5 is arranged along the inner side surface of the oil recovery tank 2, has an outer end opening to the upper side surface of the oil recovery tank 2, and has a tip reaching the bottom in the oil recovery tank 2.

Reference numeral 6 denotes an oil recovery pipe, and a suction pipe 7 and a pumping pipe 8 are connected at a lower portion to form a substantially U-shape. A suction port 9 is formed at the upper end of the suction pipe 7 and opens near the water surface of the drainage 3, and a cut 10 is formed in the suction port 9.

An injection member 11 which is extendable and retractable with respect to the water pipe 8 is fitted to the upper end of the water pipe 8. The injection member 11 has a substantially inverted U shape having a downward injection port 12 formed therein, and the injection port 12 is detachably fitted to the receiving port 4 of the oil recovery tank 2.

An air supply pipe 13 is connected to the lower end of the water pump 8 so that compressed air is injected into the water pump 8 by the air supply pipe 13.

[0014]

The oil separating apparatus 1 of the present invention is installed in the oil-containing wastewater 3 in the grease trap. Suction port 9 at the upper end of suction pipe 7
Is located near the water surface of the drain 3, the drain 3 flows into the suction pipe 7 from the suction port 9. At this time, oil is drain 3
The oil-rich drainage 3 is sucked into the oil recovery pipe 6 because it is floating near the surface of the oil recovery pipe 6.

By forming the cut 10 at the upper end of the suction pipe 7, even if the water level of the drainage 3 in the grease trap fluctuates somewhat, the drainage 3 rich in oil level can be reliably sucked. .

In this state, when compressed air is injected from the air supply pipe 13 into the pumping pipe 8, bubbles rise in the pumping pipe 8, and accordingly, drainage in the pumping pipe 8 also rises. Thereby, the drainage 3 near the liquid level is sucked into the suction pipe 7 from the suction port 9,
The oil recovery tank 2 rises in the water pumping pipe 8 and is fed from the inlet 12.
Injected into.

The wastewater 3 injected into the oil recovery tank 2
Is separated into water 3a and oil 3b in the oil recovery tank 2, and the oil 3b floats above the water 3a. When the liquid level of the drainage 3 in the oil recovery tank 2 becomes higher than the position of the upper opening of the water discharge pipe 5, the water 3 a at the bottom of the oil recovery tank 2 overflows and the oil is recovered from the opening of the water discharge pipe 5. It is discharged out of the tank 2.

That is, according to the present invention, the oil-rich wastewater 3 in the drainage channel is sucked from the suction port 9 and the oil recovery pipe 6
The water 3a near the bottom separated from the oil 3b in the oil recovery tank 2 is discharged from the water discharge pipe 5, and the oil remains in the oil recovery tank 2. I do.

When the oil 3b accumulates in the oil recovery tank 2, the injection member 11 is slid to release the injection port 12 from the receiving port 4, and is rotated with respect to the pumping pipe 8. The recovery tank 2 can be taken out of the wastewater 3, the internal oil 3b can be discarded, and the oil recovery tank 2 can be set again to continue the separation of the oil.

[0020]

Thus, according to the present invention, the oil component in the waste water 3 can be separated and removed with a simple device, and it can be used in an inexpensive small-scale kitchen or the like. 3b can be easily removed.

Since the water discharge pipe 5 is attached to the position side of the oil recovery tank 2, the opening of the water discharge pipe 5 faces downward in a state where the oil recovery tank 2 in which the oil 3 b has accumulated is taken out from the drain 3. By tilting so that the water 3a in the oil recovery tank 2 is discharged from the water discharge pipe 5, the oil 3b in the oil recovery tank 2 can be more efficiently disposed in a more concentrated state.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view of an oil separation device of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 oil separation device 2 oil recovery tank 3 drainage 4 receiving port 5 water discharge pipe 6 oil recovery pipe 7 suction pipe 8 pumping pipe 9 suction port 10 cut 11 injection member 12 inlet 13 air supply pipe

Claims (3)

[Claims] An oil recovery tank (2) installed so that at least a part thereof is above the water surface of a drainage (3), and an oil recovery tank (2) having an opening at an upper side surface and an oil recovery end. A substantially L-shaped water discharge pipe (5) reaching the bottom of the tank (2) and a substantially U-shape composed of a suction pipe (7) and a pump pipe (8) are formed. At the end, there is an inlet (12) that fits into the receiving port (4) above the oil recovery tank (2), and at the end of the suction pipe (7), drainage (3) the inlet (9) that opens near the water surface. ) And an air supply pipe (13) connected to the lower part of the pumping pipe (8). 2. The oil separation device according to claim 1, wherein a cut (10) is formed at an edge of a suction port (9) of the oil recovery pipe (6). 3. A substantially inverted U-shaped injection member (11) that is extendable and retractable with respect to the pumping pipe (8) and is provided in the pumping pipe (8) of the oil recovery pipe (6). The oil separation device according to claim 1 or 2, wherein