JPH1033903A - Oil separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suitably separate and recover an oil content in waste liquid and to obtain reusable cleaning fluid by introducing waste liquid overflowed from a cleaning tank into a separation tank from the upper part of the separation tank through a dirty tank and then discharging waste liquid from the lower part of the separation tank to a clean tank through a perforated separation plate. SOLUTION: Oil content contained in cleaning fluid in a cleaning tank 2 is flocculated and stuck on the surfaces of bubbles generated by an ultrasonic wave radiator 11 and floated. Bubbles stuck with oil content are sent out to an overflow part 7 by cleaning fluid flowed out of the surface discharge port 10 of a circulation pipe line 8 and flowed into a dirty tank 3. Bubbles stuck with oil content float up and flocculation is started. Waste liquid exceeds an overflow weir 15 and flows into a separation tank 4 together with bubbles and passes through the holes of a perforated separation plate 16 tilted in the separation tank 4. Thereby, individual flocculated oil content mutually gathers and is grown and accumulated as floating oil on the liquid surface of waste liquid in the separation tank 4. This oil content is scooped and recovered. Waste liquid separated from oil content exceeds an overflow weir 19 and flows into a clean tank 5 and is recirculated and reused as purified cleaning fluid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil / water separator for separating oil contained in a water-soluble detergent or the like to regenerate the detergent.

[0002]

2. Description of the Related Art Conventionally, there has been known a separation apparatus as disclosed in Japanese Utility Model Laid-Open No. 62-144597 for separating oil contained in a water-soluble detergent or the like. In such a separation device, as shown in the same publication, the flocculant sent from the chemical injection tank is mixed with the waste liquid in the flocculation tank and sent to the introduction chamber of the flotation separation tank, and the introduction chamber and the flotation separation chamber are mixed. In the above, the oil is separated by coagulating the oil on the surface of the bubbles generated by the ultrasonic vibrator.

[0003]

In such a conventional separation apparatus, the waste liquid is introduced into the floating separation chamber from the entire vertical direction of the introduction chamber, and the waste liquid is sent from the lower part of the floating separation chamber to the washing chamber. Since the waste liquid is easily mixed and stirred near the room to the washing room, there is a possibility of re-dissolution, and a coagulant must be used.

Accordingly, the present invention provides an oil / water separation device which satisfactorily separates oil in waste liquid and separates oil in waste liquid so that the waste liquid from which the oil has been separated and purified can be reused as a washing liquid. It is intended to be.

[0005]

In order to achieve the above-mentioned object, an oil-water separator according to one aspect of the present invention comprises a washing tank for storing an object to be washed, and a waste liquid overflowing from the washing tank. A separation tank having a plurality of inclined perforated separators provided at equal intervals and having a waste liquid discharge port formed at the lower part of the introduction tank, a clean tank communicating with the waste liquid discharge port of the separation tank, and a cleaning tank from the clean tank. And a circulation mechanism for circulating the cleaning liquid.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an oil / water separator according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 of the drawings shows a first embodiment of the oil / water separator of the present invention. As shown, the oil / water separator 1 includes a washing tank 2, a dirty tank 3, a separation tank 4, A clean tank 5 is provided, and the clean tank 5 and the cleaning tank 2 are communicated by a circulation mechanism 6. The cleaning tank 2 is formed in a box shape, and an appropriate cleaning liquid is contained in the cleaning tank 2. The workpiece is placed in the cleaning tank 2 to perform cleaning, and adheres to the workpiece. It works to remove oil and dirt. The washing tank 2 is provided with an overflow part, that is, an overflow part 7, and a dirty washing liquid in the washing tank 2,
That is, the waste liquid overflows from the overflow section 7 and is supplied to the bottom of the dirty tank 3. Further, in the cleaning tank 2, a discharge port 9 in the circulation pipe 8 of the circulation mechanism 6 is disposed at the bottom of the cleaning tank 2 and is opened, and a surface discharge port 10 is opened at a water level position of the cleaning liquid. The ultrasonic oscillator 11 is provided in the circulation line 8 in the cleaning tank 2. As described above, the dirty tank 3, the separation tank 4, and the clean tank 5 are integrally formed, and are divided by the overflow weir 15 and the separation wall 18, respectively.

The overflow portion 7 of the washing tank 2 is connected to the vicinity of the bottom of the dirty tank 3 by a connection pipe line 12, and a baffle plate 14 is provided to regulate the inflow of dirty washing liquid, that is, waste liquid. 3 suppresses the flow of waste liquid at the bottom. The dirty tank 3 is connected to the separation tank 4 via the overflow weir 15, and the waste liquid overflowing over the overflow weir 15 flows into the separation tank 4. In the separation tank 4, a plurality of perforated separation plates 16 which are vertically spaced apart from each other and arranged in an inclined and parallel state are provided to separate oil mixed in the waste liquid. It works to make it fly.

The bottom of the separation tank 4 has a discharge port 1 for waste liquid.
The waste liquid flows out of the discharge port 17 of the separation wall 18, and the waste liquid that overflows the overflow weir 19 flows into the clean tank 5. The purified waste liquid in the clean tank 5 is sent again to the cleaning tank 2 through the suction pipe 20 of the circulation mechanism 6 and the circulation pump 8 via the circulation pipe 8 via the circulation pump 21.

In the oil-water separation device of the present invention thus configured, the cleaning liquid in the cleaning tank 2 is formed by first aggregating oil on the surface of bubbles generated by the ultrasonic oscillator 11 provided in the cleaning tank 2. Adheres and floats. The bubbles to which the oil has adhered are sent out to the overflow section 7 by the cleaning liquid flowing out from the surface discharge port 10 of the circulation pipe 8 of the circulation mechanism 6, and flow into the dirty tank 3 through the connection pipe 12. The flow rate of the cleaning liquid containing bubbles flowing into the dirty tank 3, that is, the waste liquid, gradually decreases in the dirty tank 3, and accordingly, bubbles with oil attached to the liquid surface of the waste liquid in the dirty tank 3 float and aggregate. Start. Thus, the waste liquid in which the oil floats on the liquid surface and agglomerates flows into the separation tank 4 together with bubbles over the overflow weir 15, and passes through the holes of the perforated separation plate 16 in the separation tank 4 to further reduce the waste liquid. The flow velocity is reduced, and the individual coagulated oil components gather and grow together, forming an oil film as floating oil on the liquid surface of the waste liquid in the separation tank 4 and accumulating it. Therefore, it is possible to scoop and collect the oil that has floated and aggregated on the liquid surface in the separation tank 4.

The waste liquid overflows from the dirty tank 3 into the separation tank 4 and flows. The liquid portion of the waste liquid from which oil is separated in the separation tank 4 has a higher density than the waste liquid containing oil. Since the separated oil floats on the liquid surface of the waste liquid in the separation tank 4 and stays there, there is no possibility that the oil is redissolved by the action of the external force due to the flow of the waste liquid. Therefore, the oil film on the liquid surface can be separated and collected in the separation tank 4. Further, the waste liquid from which the oil has been separated flows into the clean tank 5 over the overflow weir 19, and is circulated again as a purified cleaning liquid for use.

[0012]

As described above, the oil-water separator constructed in accordance with the present invention has a cleaning tank for accommodating an object to be cleaned, a waste liquid overflowing from the cleaning tank being introduced from above and a waste liquid discharge port being provided at the lower part. , A separation tank having a plurality of inclined perforated separation plates provided at equal intervals, a clean tank communicating with the waste liquid discharge port of the separation tank, and a circulation mechanism for circulating the cleaning liquid from the clean tank to the cleaning tank. Since the overflowed waste liquid is introduced from above the separation tank, there is no turbulent flow of waste liquid, and since the waste liquid is discharged from below the separation tank, the waste liquid must be perforated and separated. After passing through the plate, the flow velocity is reduced by the perforated separating plate, and the perforated separating plate is inclined, so that the oil is suitably floated upward and separated along the inclination of the perforated separating plate. So there is no need to use a special polymer coagulant, Min can be recovered by suitably separated, therefore, the obtaining reusable cleaning liquid oil is purified is separated, it is possible to extend the life of the cleaning liquid.

According to the second aspect of the present invention, since the ultrasonic oscillator is provided in the cleaning tank, the oil floats because the oil aggregates on the surface of the bubbles generated by the ultrasonic oscillator. Separation and recovery are facilitated. According to the third aspect of the present invention, since the cleaning tank and the separation tank are completely separated by interposing the dirty tank between the cleaning tank and the separation tank, the ultrasonic oscillator in the cleaning tank is completely separated. The cleaning efficiency can be improved because the ultrasonic oscillator can be used as the cleaning power of the object to be cleaned. Further, it is not necessary to mount the ultrasonic oscillator at another place, and the cost can be reduced.

Further, according to the fourth aspect of the present invention, since the overflow weir is provided in the clean tank, the oil level in the separation tank can be kept constant.

According to the fifth aspect of the present invention, the discharge port through which the cleaning liquid circulated from the clean tank is discharged to the cleaning tank has a surface opening at substantially the same height as the overflow portion of the cleaning tank. Since it is divided into a discharge port and a discharge port in the tank that opens at the bottom of the cleaning tank, turbulence can be generated near the object to be cleaned by discharging from the discharge port in the tank, and the cleaning efficiency is improved. At the same time, by discharging the oil from the surface discharge port, the oil floating on the surface of the cleaning tank can be constantly discharged.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a first embodiment of an oil-water separation device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oil-water separation apparatus 2 Cleaning tank 3 Dirty tank 4 Separation tank 5 Clean tank 6 Circulation mechanism 7 Overflow part 8 Circulation pipeline 9 Discharge port in tank 10 Surface discharge port 11 Ultrasonic oscillator 12 Connection pipeline 14 Baffle plate 15 Flow weir 16 Separation plate 17 Waste liquid discharge port 18 Separation wall 19 Overflow weir 20 Suction line 21 Circulation pump

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Reference number in the agency FI Technical display location C02F 1/40 C02F 1/40 A

Claims (5)

[Claims] 1. A cleaning tank for accommodating an object to be cleaned, and a plurality of slanted holes provided with a waste liquid discharge port formed in the lower part of the waste liquid overflowing from the cleaning tank and provided at equal intervals and provided at equal intervals. An oil / water separator comprising: a separation tank having a separation plate; a clean tank communicating with a waste liquid discharge port of the separation tank; and a circulation mechanism for circulating a cleaning liquid from the clean tank to the cleaning tank. 2. The oil-water separator according to claim 1, wherein an ultrasonic oscillator is provided in the washing tank. 3. The oil-water system according to claim 1, further comprising a dirty tank for introducing the waste liquid overflowed from the washing tank and further overflowing the waste liquid to the upper part of the separation tank. Separation device. 4. The oil-water separator according to claim 1, wherein an overflow weir is provided in the clean tank. 5. A discharge port through which waste liquid circulated from the clean tank is discharged to the cleaning tank has a surface discharge port opening at substantially the same height as an overflow portion of the cleaning tank and a discharge port in the tank opening at the bottom of the cleaning tank. The oil-water separator according to any one of claims 1 to 4, wherein the oil-water separator is divided into an outlet and an outlet.