JPH0149524B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an apparatus for handling waste water containing oil, and more particularly to an oil-water separator that separates oil and water and further decomposes the oil.

(Prior Art) In the restaurant industry such as the restaurant industry, the treatment of oil-containing wastewater after washing dishes is becoming a major problem.

Already, cafeterias with kitchen equipment over a certain size are required to install oil traps under the floor to remove and drain oil.

(Problems to be Solved by the Invention) However, since this oil trap merely separates water and oil, it is necessary to periodically remove the oil accumulated in the oil trap. For this reason, if the oil trap is made larger, another problem arises in that the oil accumulated in the oil trap emits a foul odor.

The present invention was made in view of the above circumstances, and its purpose is to separate oil-containing wastewater into oil and water, further decompose the oil into water by the action of bacteria, and drain the water in the form of water. An object of the present invention is to provide an oil-water separator.

(Means for solving the problem) A cylindrical container, an inflow pipe inserted at an angle into the side wall of the container, and an outflow pipe having a tip end at the bottom of the container and communicating with the outside. An oil-water separator comprising a pipe, a partition wall having a small hole in the middle of the container that divides the container into two chambers, and bacteria placed on the top of the partition wall.

(Function) When wastewater containing oil is introduced into a container, the kinetic energy of the wastewater at the time of introduction is changed into centrifugal force, which causes the wastewater to rotate and separate into water and oil, which flow to the bottom of the container. The collected water is poured from the bottom of the container.
The oil is discharged through a pipe with an opening at the bottom, and the oil is decomposed by bacteria placed on the top of the bulkhead, introduced as water through small holes into the chamber at the bottom of the bulkhead, and then drained from the pipe. It is characterized by

(Example) An example of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, the top of a bowl-shaped container 1 (that is, its bottom is concave) is sealed with a lid 3 via a packing 2. As shown in FIG. An L-shaped outflow pipe 4 is inserted approximately in the center of the container 1. The portion where the outflow pipe 4 penetrates the container 1 is configured to be watertight. There is a slight gap between the tip 41 of the outflow pipe 4 and the container 1. An inflow pipe 5 is connected to the side of the container 1. Most preferably, the angle θ between the inflow pipe 5 and the container 1 is approximately tangential to the container 1, that is, 90 degrees. Or at least, preferably 45 degrees or more.A disk-shaped partition wall 6 with a V-shaped cross section is provided in the middle of the container 1. The container 1 is divided into two chambers A and B by this partition wall 6. This partition wall 6 is connected to the outflow pipe 4 at its center and to the container 1 at its periphery. And the center is higher than the surrounding area. A gap 61 is provided between the partition wall 6 and the outflow pipe 4, and a gap 62 is provided between the container 1 and the partition wall 6. Bacteria 7 for decomposing oil are placed on the upper surface of the partition wall 6.

Instead of the holes 61 and 62, small holes may be provided in the center and periphery of the partition wall 6.

Next, the operation of the apparatus according to the present invention configured as described above will be explained.

The wastewater containing oil flows into the container 1 through the inflow pipe 5.
Flow inside. Since the inflow pipe 5 is connected in the tangential direction of the container 1, the waste water flows inside the container 1 along the cylindrical side wall while having a rotational force in the direction of the arrow X. The drainage is then directed towards the bottom of the container 1 under the influence of gravity. At the same time, the initial velocity from the inlet pipe gradually slows down due to the friction between the oil and the sidewall. Conventional centrifugal separators that utilize the difference in specific gravity between oil and water and centrifugal force (for example,
61378), its bottom is flat, so when the drainage water reaches the bottom, it will cause friction between the oil and the bottom.
The rotational speed of the wastewater drops significantly, and no separation effect due to centrifugal force can be expected. On the other hand, since the bottom of the present invention is bowl-shaped (that is, the bottom is concave), the effect of gravity and the radius of the bottom are small, so the rotational (swirling) energy of the drainage is Although it will be smaller due to the friction between the bottom and the bottom, the rotational speed of the drainage water will not drop significantly. As can be seen from the fact that centrifugal force is expressed as v ² /r (v is rotational speed and r is radius), the smaller the radius, the greater the centrifugal force that can be obtained even at the same speed. Even during the helical flow at the bottom of the container of the present invention (in conventional devices, when the waste water reaches the bottom, its rotational speed is almost 0 and no centrifugal force is generated), oil and moisture are Separated by centrifugal force.
That is, water with a high specific gravity flows from the outer wall side of the container 1 to the bottom, is pushed out through the tip 41 by the outflow pipe 4, and is then discharged to the outside.

On the other hand, the separated oil collects at the upper center of the container 1, passes through the gap 61, and enters the chamber B (in the direction of arrow Y). Since there is bacteria 7 in this room B, this bacteria 7 and oil mix, and due to the decomposition function of bacteria 7, the oil decomposes and becomes water, which passes through gap 62 (in the direction of arrow Z) and returns to the room. Return to A. Thus, moisture will collect at the bottom of room A. As mentioned above, room A
The moisture accumulated at the bottom of the pipe is pushed out through the tip 41 into the outflow pipe 4. Then, it is discharged to the outside of the container 1. Undrained wastewater remains in container 1, and the next drainage will drain container 1.
When the inside becomes full, the above action is repeated.

(Effects of the Invention) As explained above, according to the present invention, centrifugal force is applied to the waste water using only the force of the waste water, oil and water are separated, and the oil is decomposed by the force of bacteria. A high-performance oil-water separator can be provided with an extremely simple configuration and without the need for external power.

[Brief explanation of drawings]

Fig. 1 is a diagram of an oil-water separator according to the present invention, the left half of the center line is an external view, the right half is a sectional view, and Fig. 2 is a top view of the device shown in Fig. 1, and the left half is an external view, and the right half is a sectional view taken along line MM in FIG. 1... Container, 2... Packaging, 3... Lid, 4
... Outflow pipe, 5 ... Inflow pipe, 6 ... Partition wall, 7 ... Bacteria, 41 ... Tip, 61,
62...time.

Claims (1)

[Scope of Claims] 1. A container having a cylindrical side wall and a concave bottom; an inflow pipe inserted through the side wall of the container at a certain angle; and a tip end of the container at the bottom of the container. An oil-water separator comprising: an outflow pipe that communicates with the outside; and a partition wall that is provided in the middle of the container and has a small hole that divides the container into two chambers. 2. The oil-water separator according to claim 1, wherein bacteria are placed on the upper part of the partition wall. 3. The oil/water separator according to claim 1, wherein the certain angle is 45 degrees or more. 4. The oil/water separator according to claim 1, wherein the small hole is between the partition wall and the outflow pipe or between the partition wall and the container.