JPS6158234B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oil-water separator for automatically purifying waste water containing oil and fat discharged from kitchens and various factories.

Although multiple waste liquids are generally discharged from equipment such as kitchens, in the past, grease traps were simply adapted as a means of treating this type of waste liquid, so the problem was that they floated inside the nodal angles. Even fats and oils are often swept away by the rapid flow of large amounts of waste liquid.In addition, in the case of the above-mentioned grease traps, the floating fats and oils inside must be manually pumped out without being able to endure it with a handle. At present, this is not actually done because it requires a lot of effort and is extremely troublesome.

In particular, since the oil and fat content in the waste liquid is discharged after washing with steam and hot water using a large amount of detergent, there is no choice but to use a large amount of detergent to form an emulsion. Although the particles are dissolved in the aqueous liquid,
It is almost possible to separate and collect such oils and fats from the waste liquid using the grease trap,
Therefore, if waste liquid containing oil and fat passes through the grease trap, the pipe for draining the waste liquid will become blocked due to the adhesion of oil and fat, and conversely, if the waste liquid is allowed to remain in the grease trap for a long time,
The floating oil and fat combined with suspended matter in the waste liquid to form a hard scum.

The present invention has been made in view of the above-mentioned points, and its purpose is to blow out air into the waste liquid containing oil and fats introduced into a separation tank, thereby eliminating dissolved or floating air in the waste liquid due to temperature effects, detergent contamination, or other causes. The specific gravity of the oil particles is further reduced by attaching the oil particles bubbles in the waste liquid, thereby promoting the floating of the oil particles dissolved in the waste liquid, so that their separation and collection can be carried out smoothly and efficiently at all times. It is an object of the present invention to provide an oil-water separator that can prevent spoilage of waste fluids such as kitchen water.

An embodiment of the present invention will be described below based on the drawings. 1 is a cylindrical separation tank for wastewater treatment;
An oil and fat concentration chamber 3 is formed in the center by a cylinder 2, and an internal space between the separation tank 1 and the inner cylinder 2 is formed by partition walls 4 to 7 to form an oil and fat separation chamber 3.
0, the separation adjustment chamber 13 at its symmetrical position, and the oil and fat floating chambers 11 and 12 located between both chambers 10 and 13.
It is divided into.

The oil and fat separation chamber 10 has a separate drainage introduction chamber 8 in its upper space, and this drainage introduction chamber 8 is connected to the oil and fat separation chamber 10 through a garbage collecting basket 9.
An introduction pipe 8a is opened in the outer wall of the drainage introduction chamber 8 and communicates with a drainage supply source. In addition, the inner bottoms of the oil and fat separation chamber 10 and the oil and fat floating chambers 11 and 12 are connected to an inner cylinder 2 as shown in FIGS. 1 and 4.
It communicates with the inside of the oil and fat concentration chamber 3 through advection holes 14 to 16 formed at the lower end. Furthermore, oil and fat separation chamber 10
The oil and fat floating chambers 11 and 12 are water holes 17 and 1 provided at the upper part of the partition walls 4 and 5 at the boundary between them.
8 and communicate with each other.

Additionally, the partition walls 4 and 5 have inclined lower ends opening at their respective abdomens, and oil and fat floating chambers 11 and 12.
The oil rising cylinders 19, 20, whose slanted upper ends are opened comfortably below the standard set water level W/L, are installed at an angle of inclination of 30 to 60 degrees, and these oil rising cylinders 19,
Reference numeral 20 has a plurality of parallel adjacent pores 19a, 20a with a lattice-like cross-section to remove dissolved fats and oils from the waste water introduced into the fat separation chamber 10.
The heavy residues in the wastewater that have been introduced near the water surface in the drains 1 and 12 and have flowed into the adjacent pores 19a and 20a are accelerated to settle toward the inner bottom of the oil and fat separation chamber 10.

On the other hand, the upper outer circumferential wall of the fat concentration chamber 3, that is, the inner cylinder 2, has a planar annular shape that extends over the fat separation chamber 10, the fat floating chambers 11, 12, and the separation adjustment chamber 13, and has a groove-like gutter shape in cross section. A weir 21 for collecting floating oil and fat is integrally provided with its upper end opened near the standard water level W and L, and an oil suction pipe 22 in the shape of a siphon is provided on the inner bottom wall of the weir 21 for collecting floating oil and fat. The top end is open.

The oil suction pipe 22 is introduced into the oil concentrating chamber 3 by tightly penetrating the cylindrical wall of the inner cylinder 2, and has its other end opened downward at the upper part of the chamber. An air lift pump 23 is provided for sucking up and forcibly discharging the oil into the fat concentration chamber 3.

Further, the separation adjustment chamber 13 is equipped with a multi-flow pipe 24 for water level adjustment and a suction discharge pipe 25.
In addition, the upper end is open to the upper part of the interior of the separation adjustment chamber 13, that is, to the water surface, and the latter suction discharge pipe 2
5 hangs down into the separation adjustment chamber 13 and has an upper open end protruding outside the separation tank 1. Like the oil suction pipe 22, it is equipped with an air lift pump 26 to drain the treated water in the separation adjustment chamber 13. The water is sucked up and sent to a waste water collection tank (not shown) or the like connected to the upper open end of the suction discharge pipe 25 via a hose or the like.

Furthermore, air diffusers 27 and 28 are housed and held at the inner bottom sides of the oil and fat floating chambers 11 and 12, respectively, at positions that are appropriately floated above the bottom walls thereof.

These air diffusers 27, 28 have many fumarole pores 27a, 2a on their peripheral walls as shown in FIG. It communicates with an air supply pipe 29 through branch pipes 29a and 29b.

Therefore, the oil/water separator having the above-mentioned configuration is used with the introduction pipe 8a of the separation tank 1 communicating with the discharge part of oil- and fat-containing wastewater in kitchens, various factories, etc., and the introduction pipe 8a is connected to the wastewater introduction chamber 8. The oil-containing wastewater introduced therein flows down into the oil-and-fat separation chamber 10 through the dust trap 9, and at this time, coarse dust in the oil-containing wastewater is first collected in the dust trap 9.

When the water level of the oil-containing waste water that has flowed into the oil separation chamber 10 rises to near the upper end of the weir 21, that is, near the standard set water level W/L, the waste liquid containing a large amount of oil and fat that has surfaced due to the difference in specific gravity is separated from the partition. The oil flows into the floating chambers 11 and 12 through the water passage holes 17 and 18 at the top of the walls 4 and 5, and also flows into the weir 21, and then flows through the oil suction pipe 22 by the operation of the air lift pump 23. The heavy oil particles that are guided into the fat concentration chamber 3 and have a settling property settle at the inner bottom of the fat separation chamber 10. In other words, water hole 1
7 and 18, the fats and oils that floated from the nodules waste liquid are
This opening was made to prevent oil from being mixed into the moisture of the waste liquid again due to the flow of waste liquid from the oil separation chamber 10 to the oil flotation chambers 11 and 12. 12, the oil and fat are kept floating on the water surface, and when this oil and fat is stirred due to the flow of waste liquid while floating, it is captured in the weir 21 without becoming dirty. This is what I did.

In addition, dissolved oil particles in the wastewater in the oil separation chamber 10 and floating oil particles in the process of floating are removed from the oil rising cylinder 1.
9 and 20 to the water surface in the oil and fat flotation chambers 11 and 12, and when it comes out of the oil rising tubes 19 and 20, it heads toward the weir 21 that constantly draws in the floating water in the oil and fat flotation chambers 11 and 12. and flows into the interior. In this case, when the oil and fat in the oil and fat separation chamber 10, which has a specific gravity and floats in the liquid without rising to the surface of the water due to the inclusion of particularly fine impurities, is introduced into the oil rising cylinder, Oil rising cylinder 19, 20
Since it has a plurality of pores 19a and 20a, the flow rate is increased and it is made finer by the disturbance. The flow of oil and fat into the oil rising cylinders 19 and 20 is controlled by the weir 2 by the air lift pump 23.
It circulates between the oil and fat separation chamber 10, the oil and fat flotation chambers 11 and 12, and the oil and fat concentration chamber 3, which are generated by suction from inside 1 and reflux of separated water through the advection holes 14 to 16, especially the large-diameter advection hole 14. Oil and fat separation chamber 10 generated due to flow force, furthermore, the introduction of waste liquid into oil and fat separation chamber 10 and the discharge of separated water from the separation adjustment chamber.
From there, through the oil and fat floating chambers 11 and 12, the separation adjustment chamber 13 is reached.
This is done by the flow force of the waste liquid into the As a result, fine impurities are separated from the oil and fat, move down the oil rising cylinder, and then settle in the oil separation chamber. The oil and fat from which fine impurities have been separated in this way becomes lighter in specific gravity in conjunction with the above-mentioned flow force, creating buoyancy, and is blown out from the oil rising tube into the oil flotation chamber and floated to the surface, and furthermore, is blown out from the air diffuser. Due to the adhesion of air, the buoyancy is further increased and the buoyancy rises to the surface of the water, whereupon it is collected into the weir.

In addition, since air is constantly blown out from the air diffusers 27 and 28 into the wastewater that has flowed into the oil and fat floating chambers 11 and 12, air may still be dissolved in the wastewater and float to the surface due to temperature effects, detergent contamination, and other causes. Even if the oil particles do not settle or are in the process of settling or trying to escape in the downward direction along the flow, the specific gravity of these oil particles decreases due to the adhesion of air bubbles blown up by the air jets from the air diffusers 27 and 28. becomes lighter and floats to the surface, then flows into the weir 21 and the air lift pump 2
3, it is passed through the oil suction pipe 22 and guided into the fat concentration chamber 3.

However, the higher the concentration of BOD (filt particles in sewage) and SS (suspended solids) containing organic substances in wastewater, the faster they decompose, and the higher the water temperature, the more likely it is that the decomposition will proceed. This can be prevented by blowing out air in the waste liquid. In this case, the amount of wastewater inflow Q (cm ³ /θ) in the oil finger floating chambers 11 and 12 is
It is sufficient to blow out air from the diffuser panels 27 and 28 within a range of 5/24 times.

In addition, the various fats and oils introduced into the fats and oils concentration chamber 3 can be kept in a static flow state without stirring or turbulence, thereby further promoting separation from water.
Generally, the fats and oils that float to the upper part of the room mix with floating matter and harden over time, but in the present invention, the air inside the fats and oils concentrating chamber 3 is heated by the advection water discharged from the oil suction pipe 22 when the air lift pump 23 is operated. Since the water surface is in a state of being hit randomly, hardening of the oil and fat that has surfaced on the water surface is prevented.

Further, in the oil concentration chamber 3, the oil and fat separated from the waste water floats to the surface, but the waste water that has descended to the inner bottom side returns to the oil separation chamber 10 through the advection hole 14. The waste liquid containing a large amount of oil and fat from the oil separation chamber 10 is again sent into the oil and fat concentrate 3 through the oil suction pipe 22, and this process is repeated to increase the oil and fat concentration in the oil and fat concentration chamber 3, that is, to increase the oil and fat concentration in the waste liquid. Promote separation.

The waste water in the oil floating chambers 11 and 12 from which most of the oil and residue have been separated and collected as described above flows into the separation adjustment chamber 1 through the advection pipe 24, and is then sucked by the air lift pump 26. The separated treated water is sent to a recovery tank (not shown) or the like via the upper discharge pipe 25.

The separation adjustment chamber 13 is used to adjust the flow rate and flow rate fluctuations using an air lift pump 26, and it is preferable that the upper end opening of the advection pipe 24 is finished by about 2 m/m from the standard water level W/L.

In addition, the fats and oils accumulated in the fats and oils concentration chamber 3 are pulled out and collected by a vacuum car, etc., and the suction force at this time causes the fats and oils separation chamber 10 and the fats and oils flotation chamber 1
The residual soot that has settled on the inner bottoms of the chambers 1, 12 and the separation and adjustment chamber 13 can also be recovered at the same time.

As explained above, the present invention stores and holds an air diffuser connected to an air supply source in a separation tank having an oil concentration chamber, and from the air diffuser into oil-containing wastewater introduced into the separation tank. Since air is blown out, even if there are dissolved oil particles, floating oil particles, or oil particles that are on their way down in the oil-containing wastewater, air bubbles are attached to them and the specific gravity of the oil particles is reduced. As a result, the above-mentioned oil particles that could not be fully floated can be smoothly promoted to float, and therefore, according to the device of the present invention, oil-water separation of oil- and fat-containing wastewater introduced into the separation tank is possible. can be carried out efficiently and reliably. In addition, the oil in the oil separation chamber, which contains fine impurities and therefore floats in the liquid without floating to the surface of the water even if it has a high specific gravity, is blown out into the oil floating chamber through the oil rising cylinder. The oil content is made fine by disturbance in the rising cylinder, and as a result, fine impurities can be separated from the oil and fat by sedimentation, and since the specific gravity of the oil and fat becomes lighter and buoyancy is created, the oil and fat upper chamber As a result, high-quality treated water with excellent oil-water separation performance can be obtained.

In addition, near the standard setting water level in the separation tank,
A weir is provided to allow the floating oil to flow in, and the oil that has flowed into the weir is sent into the oil concentration chamber using an air lift pump, so the collection and recovery of the floating oil can be carried out smoothly and efficiently at all times. .

Furthermore, by blowing air from the air diffuser into the wastewater in the separation tank as described above, it is possible to prevent the wastewater from rotting.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a vertical cross section of an oil-water separator, and FIG. 2 is a cross-section of the oil-water separator.
A line sectional view, Figure 3 is a - line sectional view of Figure 2,
FIG. 4 is a sectional view taken along the line -- in FIG. 2. 1...Separation tank, 3...Oil concentration chamber, 10...Oil separation chamber, 11, 12...Oil floating chamber, 21...Weir, 23...
Air lift pump, 27, 28... air diffuser.

Claims (1)

[Claims] 1. The inside of the separation tank is divided into a fat separation chamber, a fat flotation chamber, a fat concentration chamber, and a separation adjustment chamber, and around the fat concentration chamber, the above-mentioned fat separation chamber, fat flotation chamber, and Separation and adjustment chambers are arranged in sequence, and the oil and fat separation chamber faces an introduction pipe for waste liquid from the outside, and the oil and fat separation chamber, oil and fat flotation chamber, and separation and adjustment chamber are opened near the set water level and are connected to each room. A fat floating chamber is provided with weirs that communicate with each other through which the floating fats and oils of the weirs flow, and piping is arranged to forcibly send the fats and oils in the weirs into the fats and oils concentrating chamber, and the upper part of the fat separating chamber and an air diffuser are provided. Along with forming a water hole between the upper part of the
A portion of the separated water can flow back through the lower part of the fat concentration chamber and the fat separation chamber by communicating through an oil rising cylinder which is made up of a plurality of pores and slopes upward from the fat separation chamber toward the water surface of the fat floating chamber. 1. An oil-water separator, characterized in that the oil and fat floating chamber communicates with the oil and fat flotation chamber to send separated water to the separation adjustment chamber, and the separation adjustment chamber is provided with a suction discharge pipe.