JPH105756A - Recovery/separation device for water containing oils - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently separate water containing oils and to surely recover scum and solid impurities such as miscellaneous matter mixed in oil. SOLUTION: In a recovery/separation device 1 for separating oil and water by a difference in specific gravity, an outer cylinder 3 is formed outside a supply cylinder 2 whose inside is formed into a spiral, and an inflow part is formed between the supply cylinder 2 and the outer cylinder 3, and a recovery part 33 is arranged inside the inflow part and a recovery port 33a thereof is positioned above the inflow part, and above the supply cylinder and the outer cylinder, a raking means moving along the surface of a liquid mixture of oil and water flowing in the supply cylinder and the outer cylinder is arranged. And a separation tank 8 is packed with a whisker net 18 in which metal whiskers are formed into a net, and below the whisker net, air pipes are arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil / water recovery / separation apparatus for efficiently separating oil / water from an oil / water mixture and removing suspended solids and concentrated oil.

[0002]

2. Description of the Related Art Especially in a food factory, since animal and vegetable oils enter and float in used water, it is necessary to separate the oil and water through an oil and water recovery / separation device to collect the oil. Many of these types of oil / water recovery / separation devices utilize a specific gravity difference between oil and water to separate oil.

[0003] However, such animal and vegetable oils undergo a drastic change in viscosity with temperature, and solid impurities such as scum and miscellaneous substances are inevitably mixed in addition to oil, so that they float.
It was very difficult to recover the oil content only by the specific gravity difference.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above problems and efficiently separates oil and water, and can reliably recover solid impurities such as scum and miscellaneous substances mixed in the separated oil. An object of the present invention is to propose a recovery and separation device.

[0005]

According to a first aspect of the present invention, there is provided an oil / water recovery / separation apparatus according to the first aspect of the present invention, wherein the inside of the oil / water mixture is supplied to the outside of a spirally formed supply cylinder. A tube is formed, an inflow portion is formed between the supply tube and the outer tube, and an oil / water mixture floating from the lower portion of the supply tube so as to swirl is guided to the inflow portion and provided in the inflow portion. A collection and separation device that separates oil and water by a difference in specific gravity by passing through a separation tank, wherein a collection unit is disposed inside the inflow portion, and a collection port thereof is positioned above the inflow portion, A scraping means that moves along the liquid surface of the oil-water mixture flowing into the supply cylinder and the outer cylinder is disposed above the supply cylinder and the outer cylinder, and is included in the oil-water mixture by the scraping means. The floating solids and concentrated oil that have been collected To.

[0006] The oil / water recovery / separation device of claim 2 is
An outer cylinder is formed outside a supply cylinder in which the inside of supplying the oil-water mixture is formed in a spiral shape, an inflow portion is formed between the supply cylinder and the outer cylinder, and a vortex is swirled from a lower part of the supply cylinder. A recovery / separation device that guides an oil / water mixture that floats to the inflow portion and passes through a separation tank provided in the inflow portion to separate oil and water by a difference in specific gravity. A whisker net in which metal whiskers are formed in a net shape is filled, and air blowing means for blowing air into the whisker net is arranged below the whisker net.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 to 3, reference numeral 1 denotes an oil / water recovery / separation apparatus according to the present invention. The oil / water recovery / separation apparatus 1 uses floating oil in wastewater discharged from a food factory or the like by utilizing a specific gravity difference. To separate oil and water.

In the oil / water recovery / separation apparatus 1, an inflow portion 4 is formed between a supply tube 2 for supplying an undiluted wastewater (oil / water mixture) and an outer tube 3 provided on the outer periphery thereof. 4, a first separation tank 7 and a second separation tank 8 partitioned by partition walls 5 and 6 are formed. In addition, inclined surfaces 5a and 6a are formed at the upper ends of the partition walls 5 and 6, respectively.

A pipe 11 is erected in the center of the inside of the supply tube 2 in the longitudinal direction, and a spiral portion 12 is provided by a stainless steel plate member in a gap between the pipe 11 and the inner surface of the supply tube 2. Have been. An opening 13 is formed on the upper side surface of the supply tube 2, and a collection pipe 14 is attached to the bottom. The recovery pipe 14 is provided with a feed pump 15 for the undiluted wastewater (oil-water mixture).
It is connected to the.

Next, a whisker (thin wire of 30 to 40 microns) of a metal such as stainless steel is provided in an intermediate portion of the first separation tank 7.
A container 19 filled with a whisker net 18 formed in a net shape is disposed, and the container 19 has a large number of through holes 2.
0 is formed. An air pipe 21 is disposed below the container 19, and the air pipe 21 has a number of through holes (not shown).

The surface of the whisker is pickled, and the surface of the whisker is processed by roughening (roughening) to increase the surface area. Further, the container 19 may be provided so as to be exchangeable.

An opening 24 communicating with a third separation tank 23 is formed in the outer cylinder 3 near the first separation tank 7 below the partition 5. In addition, a fourth separation tank 26 is formed adjacent to the third separation tank 23 via a partition 25, and a fifth separation tank 26 is adjacent to the fourth separation tank 26 via a partition 27. A bath 28 is formed. Then, the partition walls 25 and 27
A partition plate 29 for adjusting the liquid surface of the separation tanks 23 and 28 is slidably attached to the partition plate 29.

A drain port 30 is formed below the fourth separation tank 26, and a fifth separation tank 28 is formed in the outer cylinder 3 near the partition 6 on the side of the second separation tank 8. The part 31 communicates with the second separation tank 8.

A substantially concave recovery part 33 is disposed inside the inflow part 4 on the back side of the partition 6, and a recovery port 33a of the recovery part 33 is provided.
Is located at the upper part of the inflow part 4, and the lower part extends outside the outer cylinder 3.

Next, the upper part of the supply cylinder 2 and the outer cylinder 3 is moved along the liquid surface 35a of the undiluted oil-water mixture (oil-water mixture) 35 flowing into the supply cylinder 2 and the outer cylinder 3. Rake means is disposed. A rotating plate 38 formed of a resin or a metal such as stainless steel; a rotating shaft 39 fixed at an upper portion of the center of the rotating plate 38;
It is composed of a large number of scraping plates 40 formed of resin or metal such as stainless steel arranged on the lower surface. The rotating shaft 39 is connected to a motor 41.

A support piece 40 provided above the scraping plate 40
“a” is movably supported by a shaft member 44 bridged over a U-shaped support member 43 that is slightly obliquely attached to the lower surface of the rotating plate 38 by a screw 42. Note that the scraping means is not necessarily limited to the scraping plate 40, but may be a brush, a cloth, or the like.

According to the oil / water recovery / separation apparatus 1 having the above-described structure, the feed water 15
When 5 is supplied from the lower part of the supply tube 2, the undiluted wastewater 35 separates with a specific gravity difference while slowly floating along the back surface of the spiral portion 12. At this time, the light oil is in the spiral part 1
The oil adheres to the back surface of the feed cylinder 2 and gradually rises to coarse particles while increasing the buoyancy to become concentrated oil, which overflows from the upper opening 13 of the supply tube 2 and flows into the inflow section 4. Then, the position of the liquid surface 35a of the influent undiluted liquid 35 gradually rises,
It becomes constant when the inflow and outflow balance.

By the way, since the solid wastewater 35 always contains solid impurities such as scum and miscellaneous substances in addition to oil and floats, when the motor 41 is operated to rotate the turntable 38, Since the scraping plate 40 also moves along the liquid surface 35a of the undiluted wastewater 35 flowing into the supply cylinder 2 and the outer cylinder 3,
By the movement of the scraping plate 40, solid impurities such as scum and miscellaneous substances contained in the undiluted wastewater 35 are scraped to the collection port 33a of the collection unit 33, and are introduced into the collection unit 33 and collected.

On the other hand, oil is mixed in the undiluted waste water 35 flowing out into the inflow section 4, but is separated vertically by the specific gravity difference in the first separation tank 7, and the oil particles are separated from the whisker net 18.
When it comes into contact with the fine wire, it adheres due to its surface tension and can be collected more, and the moisture passes as it is. As described above, since the oil is retained in the whisker net 18, even if there is some flow in the undiluted drainage liquid 35, the oil and water are hardly mixed with each other, so that the oil / water separation efficiency is high. By generating air from the air pipe 21, the oil attached to the whisker net 18 is forcibly dropped and floats.

The separated oil overflows the upper part of the partition wall 5 between the first separation tank 7 and the second separation layer 8 and flows into the second separation layer 8. At this time, some water flows into the second separation layer 8 together with the separated oil. On the other hand, the water in the first separation tank 7 flows into the third separation tank 23 from an opening 24 provided in the lower part of the outer cylinder 3. Then, the oil that has flowed into the second separation layer 8 overflows the upper part of the partition 6 and flows into the recovery port 33 a of the recovery unit 33 and is recovered. The water that has flowed into the second separation layer 8 flows into the fifth separation tank 28 through an opening 31 provided at the lower part of the outer cylinder 3. The water flowing into the third separation tank 23 and the fifth separation tank 28 overflows the upper parts of the partition walls 25 and 27 provided in each layer, flows into the fourth separation tank 26, and drains water thereunder. It is drained from the mouth 30. In addition, the partition plate 29 provided in the partition walls 25 and 27
The water level can be adjusted by moving the water up and down.

By repeating such separation, the oil water is completely separated, the oil is recovered, and the solid impurities such as suspended scum and miscellaneous substances are also recovered.

[0023]

As described above, according to the first aspect of the present invention, the oil-water separation can be efficiently performed only by flowing the oil-water mixture into the separation tank provided at the inflow portion, by the difference in specific gravity. Can be. In addition, solid impurities such as scum and miscellaneous substances which are mixed and suspended in the oil-water mixture can be raked and collected by the rake means.

According to the second aspect of the present invention, the oil particles in the oil-water mixture are attached to and retained on the whisker nets. Are not easily mixed with each other, so that the oil-water separation efficiency is good.
Further, by blowing air into the whisker net from an air pipe, the attached oil can be forcibly dropped and floated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an oil / water recovery / separation device according to the present invention.

FIG. 2A is a cross-sectional view of the oil / water recovery / separation device partially omitted, and FIG. 2B is an explanatory diagram showing an operation state of a partition plate attached to a partition.

FIG. 3 is a development view of the oil / water recovery / separation device.

FIG. 4A is an explanatory plan view showing a state in which a scraping plate is attached to a rotating disk, and FIG. 4B is a front view showing a state in which a scraping plate is attached to a rotating disk.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oil-water collection | separation apparatus 2 Supply cylinder 3 Outer cylinder 4 Inflow part 7,8 Separation tank 18 Whisker net 21 Air-pipe 33 Collection part 33a Collection port 35 Drain stock solution (oil-water mixture) 40

Claims (2)

[Claims] An outer cylinder is formed outside a supply cylinder in which the inside of supplying the oil-water mixture is formed in a spiral shape, and an inflow portion is formed between the supply cylinder and the outer cylinder. A recovery / separation device that guides an oil / water mixture that floats in a swirl from the lower portion to the inflow portion, passes through a separation tank provided in the inflow portion, and separates oil and water by a specific gravity difference, A recovery section is disposed inside the inflow section, and a recovery port thereof is positioned above the inflow section, and a liquid of the oil-water mixture flowing into the supply cylinder and the outer cylinder is provided above the supply cylinder and the outer cylinder. Oil scraping means, wherein a scraping means moving along the surface is disposed, and the scraping means scrapes the suspended solids and the concentrated oil contained in the oil-water mixture to a collecting port of the collecting section. Separation device. 2. An outer cylinder is formed outside a supply cylinder in which an oil-water mixture is supplied in a spiral shape, and an inflow portion is formed between the supply cylinder and the outer cylinder. A recovery / separation device that guides an oil / water mixture that floats in a swirl from the lower portion to the inflow portion, passes through a separation tank provided in the inflow portion, and separates oil and water by a specific gravity difference, An oil / water recovery / separation apparatus, wherein the separation tank is filled with a whisker net formed of metal whiskers in a net shape, and air blowing means for blowing air into the whisker net is arranged below the whisker net. .