JP3555050B2 - Apparatus and method for continuous cleaning of oil-containing sludge - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus and a method for continuously treating oil-containing sludge generated in highly contaminated oil-contaminated soil or oil refineries generated in a crude oil spill accident to purify sludge and collect oil. .
[0002]
[Prior art]
Occasionally, an oil spill accident occurs while a crude oil tanker or the like is navigating, and floating oil drifts to land and contaminates a wide range of earth and sand. In addition, a large amount of crude oil is spilled due to an oil field accident or conflict, and the earth and sand may be widely contaminated at a high concentration, for example, an oil content exceeding 20%. In such a case, it is desired to clean the soil contaminated with a large amount of oil as quickly as possible. Oil refinery tanks at refineries are subject to release inspections every seven years, as required by the Fire Service Law. At this time, the crude oil in the tank is extracted and the inside is cleaned. As a result, a large amount of oil-containing sludge is discharged. Its emissions reach, for example, about 5,000 tonnes per year in a refinery with a capacity of 200,000 barrels / day. Since these oil-containing sludges also contain a considerable amount of crude oil and are discarded as they are, the environmental pollution is remarkable, so that a cleaning treatment is required. Conventionally, oil-containing sludge such as oil-contaminated soil and oil-containing sludge has been purified by incineration, gasification or burial.
[0003]
[Problems to be solved by the invention]
However, these cleaning methods such as incineration, gasification, and burial are not desirable methods because they require enormous costs and cause secondary environmental obstacles such as generation of waste gas and soil pollution. Therefore, biological processing has been considered as an alternative processing method. However, since the processing speed is slow, a large processing area and a long time are required, which is unsuitable for mass processing. In addition, any of these treatment methods causes oil to be lost without being collected, which is a problem from the viewpoint of resource saving.
[0004]
Therefore, the present inventors have previously proposed a method of extracting oil from oil-contaminated soil or oil-containing sludge with a solvent, separating the oil into a solid phase and a solid phase, and washing the solid phase with water to purify it (Japanese Patent Application No. Hei. 7-118811 and Japanese Patent Application No. 7-337086). According to these methods, not only can oil-contaminated soil or oil-containing sludge be purified at low cost, but also the separated oil can be recovered and used, which is advantageous from the viewpoint of resource saving. However, in implementing these methods, the above proposal was not suitable for mass processing because the apparatus was of a batch type. The present invention has been made to solve this problem, and its object is to continuously treat oil-containing sludge such as oil-contaminated earth and sand or oil-containing sludge to purify sludge and collect oil. It is to provide an apparatus and a method.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a rotary cylinder having a porous peripheral surface, which is rotatably disposed in an outer cylinder by inclining its rotation axis, and having an oil-impregnated upper end portion. An oil-containing sludge supply port for supplying sludge is formed, a deoiled sludge discharge port is formed at the lower end, and a water supply port for supplying water into the outer cylinder, and the water and liquid-liquid separation are possible. A solvent supply port for supplying a solvent having a specific gravity lower than that of water, an aqueous phase discharge port for discharging a liquid phase liquid-liquid separated in the outer cylinder, and discharging an oil phase liquid-liquid separated in the outer cylinder. Provided is an apparatus for continuously cleaning oil-containing sludge provided with an oil phase discharge port.
Here, the oil-containing sludge is a general term for oil-containing mud including oil-contaminated soil and oil-containing sludge.
[0006]
Preferably, the outer cylinder is provided with a heating means. It is preferable that a sludge scraping means is provided at the deoiled sludge discharge port. Alternatively, it is preferable that a watertight conveying means for conveying the discharged sludge upward is connected to the deoiled sludge discharge port. Further, it is preferable that a continuous dewatering device for dewatering the sludge discharged from the deoiled sludge discharge port is provided.
[0007]
In the present invention, when the oil-containing sludge is purified using the oil-containing sludge continuous cleaning device, the rotary cylinder is rotated, and the oil-containing sludge is continuously supplied to the oil-containing sludge supply port of the rotary cylinder. Water and the solvent are supplied into the outer cylinder through the water supply port and the solvent supply port, respectively. Continuous purification of oil-bearing sludge by discharging the water and oil phases separated by liquid and liquid so as to be kept at a position crossing the surface, and continuously discharging the deoiled and water-containing sludge from the deoiling sludge outlet. Provide a way.
[0008]
In the above, it is preferable that the oil phase in the outer cylinder is heated within a temperature range of 50C to 100C. It is preferable that the hydrous sludge continuously discharged from the deoiled sludge discharge port be continuously dewatered by using an attached continuous dewatering device. It is preferable to supply water containing a surfactant from the water supply port of the outer cylinder.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings using examples.
(Example 1)
In FIG. 1, reference numeral 10 indicates an embodiment of the continuous apparatus for cleaning oil-containing sludge of the present invention (hereinafter, simply referred to as “the present apparatus”). In this apparatus 10, a rotary cylinder 1 having a peripheral surface made of a wire mesh is rotatably disposed in an outer cylinder 2 with its rotation axis inclined, and an oil-containing sludge OS is supplied to an upper end portion of the rotary cylinder 1. An oil-containing sludge supply port 3 is formed at the lower end, and a deoiled sludge discharge port 4 is formed at the lower end. A water supply port 7 for supplying water W into the outer cylinder 2 is provided. A solvent supply port 5 for supplying a solvent S capable of separation and having a lower specific gravity than this water, an aqueous phase outlet 8 for discharging the aqueous phase WP separated in the outer cylinder, and a liquid / liquid separation in the outer cylinder. And an oil phase discharge port 6 for discharging the oil phase OP. Although not shown, a detachable lid member is attached to the deoiled sludge discharge port 4.
[0010]
Further, in the present apparatus 10, a hopper 11 for supplying the oil-containing sludge OS to the rotary cylinder 1 is inserted into the oil-containing sludge supply port 3, and the outer surface of the outer cylinder 2 has an oil phase OP and an aqueous phase inside the outer cylinder 2. The WP is covered with a warm water jacket 12 that can maintain the temperature of the WP within a range of 50C to 100C. The device 10 is provided with a vibrating screen 20 for continuously dewatering the hydrous sludge WS discharged from the deoiled sludge discharge port 4.
[0011]
Next, an embodiment of a method for cleaning the oil-containing sludge OS using the present apparatus 10 will be described.
First, a cover member (not shown) is attached to the deoiled sludge discharge port 4 of the present apparatus 10, and the rotary cylinder 1 is rotated at an appropriate speed. A solvent S, such as kerosene or light gas oil, having a high flash point, a lower specific gravity than water, and capable of separating liquid and liquid from water is supplied from the solvent supply port 5, and liquid-liquid separation is performed from the aqueous phase discharge port 8 in the outer cylinder 2. The separated aqueous phase WP is discharged from the oil phase discharge port 6 at an appropriate speed. As a result, the interface L between the aqueous phase WP and the oil phase OP separated into liquid and liquid in the outer cylinder 2 is maintained at a position crossing the peripheral surface of the rotary cylinder 1. Hot water is passed through the jacket 12 to adjust the temperature of the water phase WP and the oil phase OP in the outer cylinder 2 to an appropriate temperature in the range of 50C to 100C.
[0012]
In this state, the oil-containing sludge OS carried in from the generation site is supplied to the hopper 11. The oil-containing sludge OS is continuously introduced from the hopper 11 into the oil-containing sludge supply port 3 of the rotary cylinder 1, and moves downward while rotating inside the inclined rotary cylinder 1. During this time, the oil-containing sludge OS comes into contact with the oil phase OP at an increased temperature, and the oil contained in the sludge is extracted into the oil phase OP. The sludge that has moved further downward in the rotary cylinder 1 reaches the aqueous phase WP over the interface L, is washed by being swirled and stirred in contact with the aqueous surfactant solution, and the oil phase OP adhered to the surface of the sludge. Is emulsified or dispersed in the aqueous phase WP and removed from the sludge. The washed hydrous sludge WS is gradually accumulated in the vicinity of the deoiled sludge outlet 4.
[0013]
When an appropriate amount of the hydrated sludge WS is accumulated in the vicinity of the deoiled sludge outlet 4, the cover member of the deoiled sludge outlet 4 is removed. Thereby, the sludge accumulated near the deoiled sludge discharge port 4 is sequentially and continuously discharged from the deoiled sludge discharge port 4, and furthermore, the oil phase OP and the water phase WP in the outer cylinder 2 are deoiled. The interface L does not flow out from the sludge discharge port 4 and the interface L is kept constant.
[0014]
The hydrous sludge WS discharged from the deoiled sludge discharge port 4 is dropped on the sieve surface of the attached vibrating screen 20, dewatered by vibration, discharged from the discharge end, and collected as purified sludge CS. Since the water phase WP separated by the vibrating screen 20 contains emulsified or dispersed oil like the water phase WP in the present apparatus 10, the aqueous phase WP discharged from the water phase outlet 8 of the present apparatus 10 It is combined with the WP and sent to a wastewater treatment step (not shown).
[0015]
The water phase WP is destroyed in a known manner by emulsification or dispersion in a wastewater treatment step (not shown), separated into an oil phase and an aqueous phase, and the oil phase is discharged from the oil phase discharge port 6 of the apparatus 10. Combined with phase OP. The separated aqueous phase can be circulated and used as the supply water W to the water supply port 7 of the main body 10 by adding a surfactant, or can be discharged by performing a normal wastewater treatment.
[0016]
Both the oil phase OP discharged from the oil phase discharge port 6 of the present apparatus 10 and the oil phase separated in the above-mentioned wastewater treatment step are composed of the oil in the oil-containing sludge OS and the solvent S such as kerosene or light gas oil. Therefore, for example, in a refinery or the like, it can be returned to the oil refining process as a part of the raw material, and can be effectively used as fuel or the like. The purified sludge CS obtained by being dehydrated by the vibrating screen 20 may be subjected to a biological treatment, or may be subjected to a treatment such as being buried in the ground without being subjected to the biological treatment.
[0017]
The hole diameter of the wire mesh forming the peripheral surface of the rotary cylinder 1 of the present apparatus 10 is selected depending on the particle size of the solid particles of the oil-containing sludge OS to be treated. The point is that it is sufficient to select a pore size that allows the oil phase OP and the water phase WP to easily pass through and does not allow the solid particles of the oil-containing sludge OS to flow out of the rotary cylinder 1. As a result, the fresh solvent S and the water W come into contact with the sludge particles swirled and agitated in the rotary cylinder 1, and the extraction effect and the washing effect are improved.
[0018]
The inclination angle of the rotary cylinder 1 is not particularly limited, but if the inclination angle from the horizontal is small, the moving speed of the sludge in the rotation axis direction becomes slow, so that the extraction effect and the washing effect are improved. descend. When the inclination angle is large, the opposite effect appears. Therefore, it is preferable to determine the inclination angle in consideration of the oil content of the target oil-containing sludge OS and the difficulty of deoiling.
[0019]
The preferred range of the temperature of the oil phase OP (and the aqueous phase WP) in the present apparatus 10 is determined by the type of the solvent to be used and the legal regulations accompanying it. Generally, the temperature is preferably in the range of 50C to 100C, more preferably in the range of 60C to 70C. If the temperature is lower than 50 ° C., the oil fixed to the oil-containing sludge OS does not easily swell, and it may take a long time to extract the oil. Disadvantages such as bulkiness.
[0020]
If necessary, an oil-soluble surfactant can be added to the solvent S as a penetrant or a swelling agent. These oil-soluble surfactants have the effect of allowing the solvent to penetrate into the oil-containing sludge OS and swelling the fixed oil component, so that the extraction efficiency can be improved.
[0021]
The water W supplied to the water supply port 7 of the device 10 may be simple water, but is more preferably an aqueous surfactant solution. Surfactants are effective for dispersing oil adhering to the solid phase in water and preventing re-adhesion. The type of the surfactant used is not particularly limited as long as the oil can be effectively dispersed in water. However, it is preferably biodegradable and phosphorus-free. Preferable examples thereof include soaps, higher alcohol surfactants, anionic surfactants such as α-olefin sulfonic acid surfactants, polyhydric alcohol fatty acid ester surfactants, and polyoxyethylene surfactants. And nonionic surfactants such as sorbitan polyoxyethylene surfactants, polyoxyethylene propylene surfactants, and fatty acid alkylolamide surfactants.
[0022]
In the above embodiment, the vibrating sieve 20 was used for dehydrating the hydrous sludge WS. However, the dewatering device is not limited to this, and other known continuous solid-liquid separation devices, for example, a top discharge type, a bottom discharge type A type or horizontal type continuous centrifuge, a continuous centrifugal decanter, an ultracentrifugal decanter, or the like can also be suitably used.
[0023]
According to the method of the present invention described above, the purified sludge CS containing no oil can be continuously obtained from the oil-containing sludge OS, and the separated oil can be effectively used. The above method can use an inexpensive and reusable oil agent such as kerosene or light gas oil easily obtained in petroleum refining factories and the like as a solvent, and does not require high temperature and high pressure. And the safety of the process is high.
[0024]
(Example 2)
The present apparatus 30 of the second embodiment shown in FIG. 2 is the same as that of the first embodiment except that sludge scraping means is provided at the deoiled sludge discharge port. Hereinafter, the same elements as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0025]
In the second embodiment, the deoiled sludge discharge port 31 formed at the lower end of the rotary cylinder 1 has a cylindrical shape coaxial with the rotary cylinder 1 and projects from the lower end surface of the outer cylinder 2 in a watertight and rotatable manner, The screw mechanism 32 is inserted therein. The screw mechanism 32 has a spiral wing 34 formed around a rotatable cantilever shaft 33, and a lid member 35 for closing the opening end 31 a of the deoiled sludge discharge port 31 at the base of the cantilever shaft 33. Is installed. The screw mechanism 32 can be moved back and forth on the rotation axis of the rotary cylinder 1 by means not shown.
[0026]
Prior to the operation of the device 30, the screw mechanism 32 is pressed against the rotary cylinder 1 so that the lid member 35 is in close contact with the opening end 31a. In this state, the opening end 31 a is closed, and when the rotary cylinder 1 is rotated, the screw mechanism 32 rotates together with the rotary cylinder 1, so that the screw blades 34 are moved relative to the deoiled sludge discharge port 31. Is stationary.
[0027]
While rotating the rotary cylinder 1 in a state where the deoiled sludge discharge port 31 is closed by the lid member 35, the aqueous solution W of the surfactant is discharged from the water supply port 7 as in the first embodiment shown in FIG. A solvent S such as kerosene or light gas oil, which has a higher flash point and a lower specific gravity than water and is capable of separating liquid and liquid from water, is supplied from a solvent supply port 5. When the oil phase WP is discharged from the discharge port 6 at an appropriate speed, the deoiled sludge discharge port 31 is closed, so that the water phase WP and the oil phase OP are separated into liquid and liquid in the outer cylinder 2. The interface L is maintained at a position crossing the peripheral surface of the rotary cylinder 1. Hot water is passed through the jacket 12 to adjust the temperature of the water phase WP and the oil phase OP in the outer cylinder 2 to an appropriate temperature in the range of 50C to 100C.
[0028]
Next, the oil-containing sludge OS carried in from the generation site is supplied to the hopper 11. The oil-containing sludge OS is continuously introduced from the hopper 11 into the oil-containing sludge supply port 3 of the rotary cylinder 1, and moves downward while rotating inside the inclined rotary cylinder 1. During this time, the oil-containing sludge OS comes into contact with the oil phase OP at an increased temperature, and the oil contained in the sludge is extracted into the oil phase OP. The sludge that has moved further downward in the rotary cylinder 1 reaches the aqueous phase WP over the interface L, is washed by being swirled and stirred in contact with the aqueous surfactant solution, and the oil phase OP adhered to the surface of the sludge. Is emulsified or dispersed in the aqueous phase WP and removed from the sludge. The washed hydrous sludge WS is gradually accumulated near the deoiled sludge outlet 31.
[0029]
When a suitable amount of the hydrated sludge WS is accumulated in the vicinity of the deoiled sludge discharge port 31, the screw mechanism 32 moves in a direction in which the lid member 35 moves away from the opening end 31a. Further, the screw mechanism 32 is rotated at an appropriate rotation speed relative to the deoiled sludge discharge port 31 in the rotation direction in which the hydrous sludge WS accumulated near the deoiled sludge discharge port 31 is scraped out by the screw blades 34. Rotate. As a result, the sludge accumulated near the deoiled sludge outlet 31 is sequentially and continuously discharged from the open end 31a of the deoiled sludge outlet. At this time, the oil phase OP and the water phase WP in the outer cylinder 2 do not flow out of the deoiled sludge discharge port 31, and the interface L is kept substantially constant during operation.
[0030]
The hydrous sludge WS discharged from the deoiled sludge discharge port 31 is continuously dehydrated by using the vibrating sieve or the continuous centrifuge shown in the first embodiment, and is recovered as the purified sludge CS. When the screw mechanism 32 of the second embodiment is used, the oil phase OP and the aqueous phase WP do not flow out of the deoiled sludge discharge port 31 during operation, and the hydrated sludge WS accumulated near the deoiled sludge discharge port 31 is operated. At a suitable speed can be smoothly and continuously discharged from the open end 31a.
[0031]
(Example 3)
The apparatus 40 of the third embodiment shown in FIG. 3 is the same as that of the first embodiment except that a drainage sludge discharge port 41 is provided with a watertight conveying means 42 for conveying the discharged sludge upward. It is.
In the third embodiment, the deoiled sludge discharge port 41 formed at the lower end of the rotary cylinder 1 has a cylindrical shape coaxial with the rotary cylinder 1 and protrudes from the lower end surface of the outer cylinder 2 in a watertight and rotatable manner. The terminal is released and connected to the base insertion opening 43 of the vertically rising lift mechanism 42 in a watertight and rotatable manner.
[0032]
The lift mechanism 42 is mounted so that a screw shaft 45 is coaxially mounted in an upright bottomed cylindrical body 44 so as to be rotationally driven by a motor 46, and a spiral blade 47 is formed around the screw shaft 45. A top outlet 48 is formed at the top of the bottomed cylindrical body 44. The lift mechanism 42 conveys the hydrous sludge WS supplied from the base insertion port 43 to the top discharge port 48 provided at a position higher than the top height of the outer cylinder 2 by the rotation of the spiral blade 47. I have.
[0033]
When the present apparatus 40 supplies the aqueous solution W of the surfactant from the water supply port 7, the aqueous solution W forms the same level of the water surface inside the outer cylinder 2 and the bottomed cylinder 44. Next, a solvent S, such as kerosene or light gas oil, having a high flash point and a lower specific gravity than water and capable of separating liquid and liquid from water, is supplied from the solvent supply port 5, and the aqueous phase WP is supplied from the aqueous phase discharge port 8 to When the oil phase WP is discharged from the phase discharge port 6 at an appropriate speed, the interface L between the water phase WP and the oil phase OP in the outer cylinder 2 is maintained at a position crossing the peripheral surface of the rotary cylinder 1. A water surface (not shown) higher than the interface L by a height corresponding to the liquid depth of the oil phase WP is formed in the bottomed cylinder 44.
[0034]
The rotary cylinder 1 is rotated, and the oil-containing sludge OS carried in from the generation site is supplied to the hopper 11. The oil-containing sludge OS is continuously introduced from the hopper 11 into the oil-containing sludge supply port 3 of the rotary cylinder 1, and moves downward while rotating inside the inclined rotary cylinder 1. During this time, the oil-containing sludge OS comes into contact with the oil phase OP at an increased temperature, and the oil contained in the sludge is extracted into the oil phase OP. The sludge that has moved further downward in the rotary cylinder 1 reaches the aqueous phase WP over the interface L, is washed by being swirled and stirred in contact with the aqueous surfactant solution, and the oil phase OP adhered to the surface of the sludge. Is emulsified or dispersed in the aqueous phase WP and removed from the sludge. The washed hydrous sludge WS is gradually accumulated in the vicinity of the deoiled sludge outlet 41.
[0035]
The hydrated sludge WS accumulated near the deoiled sludge discharge port 41 is self-propelled downward through the deoiled sludge discharge port 41 due to rotation, and is introduced into the bottomed cylindrical body 44 from the base insertion port 43. Then, the water is conveyed upward beyond the water level in the bottomed cylindrical body 44 by the rotating spiral blades 47 and discharged from the top discharge port 48. As a result, the sludge accumulated near the deoiled sludge discharge port 41 is sequentially and continuously discharged from the top discharge port 48, and the oil phase OP and the water phase WP in the outer cylinder 2 flow out from the top discharge port 48. The interface L is kept constant during operation.
[0036]
The hydrous sludge WS discharged from the top discharge port 48 is continuously dewatered by using the vibrating screen or the continuous centrifugal separator shown in Embodiment 1 if necessary, and is recovered as the purified sludge CS. If the lift mechanism 42 of the third embodiment is used, the oil phase OP and the aqueous phase WP do not flow out through the deoiled sludge discharge port 41 during operation, and the wet sludge WS accumulated near the deoiled sludge discharge port 4. Is smoothly and continuously discharged from the top discharge port 48 at a suitable speed.
The lift mechanism described above may be a screw conveyor type provided with a spiral blade 47 or a bucket conveyor type provided in a watertight tower.
[0037]
【The invention's effect】
In the continuous cleaning apparatus for oil-containing sludge of the present invention, a rotary cylinder having a porous peripheral surface is rotatably disposed in an outer cylinder by inclining its rotation axis. An oil-containing sludge supply port for supplying sludge is formed, a deoiled sludge discharge port is formed at the lower end, and a solvent supply port for supplying a solvent having a lower specific gravity than water and capable of separating liquid and liquid from the outer cylinder. And an oil phase discharge port for discharging the oil phase liquid-liquid separated in the outer cylinder, a water supply port for supplying water to the outer cylinder, and water for discharging the liquid phase liquid-liquid separated in the outer cylinder. The rotary cylinder is rotated so that the oil-containing sludge is continuously supplied to the oil-containing sludge supply port of the rotary cylinder, and the outer cylinder is supplied from the water supply port and the solvent supply port. Water and solvent are supplied to the inside, respectively. The oil phase is discharged from the oil-containing sludge by discharging the water phase and oil phase that have been separated into liquid and liquid so that they are kept in position, and continuously discharging the deoiled and water-containing sludge from the deoiling sludge outlet. Clean sludge can be continuously obtained, and the separated oil can be effectively used. The above-described method of the present invention is not only suitable for large-scale purification of oil-containing sludge, but also uses an inexpensive and reusable oil agent such as kerosene or light gas oil easily obtained in a petroleum refining plant or the like as a solvent. Since high temperature and high pressure are not required, there is an advantage that consumable costs and energy costs are small, and process safety is high.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing one example of an apparatus for continuously cleaning oil-containing sludge of the present invention and an embodiment using the same.
FIG. 2 is a partial sectional view showing another example of the continuous cleaning apparatus for oil-containing sludge of the present invention and an embodiment using the same.
FIG. 3 is a cross-sectional view showing still another example of the continuous cleaning apparatus for oil-containing sludge of the present invention and an embodiment using the same.
[Explanation of symbols]
1 Rotating cylinder 2 Outer cylinder 3 Oil-containing sludge supply port 4 Deoiled sludge discharge port 5 Solvent supply port 6 Oil phase discharge port 7 Water supply port 8 Water phase Discharge port 10: Continuous cleaning apparatus 20 for oil-containing sludge of the present invention 20 Continuous dewatering apparatus OS: Oil-containing sludge WS: Water-containing sludge CS: Cleaned sludge S: Solvent W: Water OP: Oil phase WP: water phase L: interface

Claims (9)

A rotary cylinder having a porous peripheral surface is rotatably disposed in the outer cylinder with its rotation axis inclined, and an oil-containing sludge supply port for supplying oil-containing sludge is formed at an upper end of the rotary cylinder, A deoiled sludge outlet is formed at the lower end,
The outer cylinder, a water supply port for supplying water into the outer cylinder, a solvent supply port for supplying a solvent having a lower specific gravity than the water and capable of liquid-liquid separation, and a liquid-liquid separation in the outer cylinder. A continuous apparatus for purifying oil-bearing sludge, comprising an aqueous phase discharge port for discharging an aqueous phase, and an oil phase discharge port for discharging an oil phase liquid-liquid separated in an outer cylinder. The apparatus for continuously cleaning oil-containing sludge according to claim 1, wherein a heating means is provided in the outer cylinder. The continuous cleaning apparatus for oil-containing sludge according to claim 1, wherein a sludge scraping means is provided at the deoiled sludge discharge port. 2. The continuous apparatus for purifying oil-containing sludge according to claim 1, wherein a water-tight conveying means for conveying the discharged sludge upward is connected to the deoiled sludge discharge port. 3. The continuous cleaning device for oil-containing sludge according to claim 1, further comprising a continuous dewatering device for dewatering the sludge discharged from the deoiled sludge discharge port. When cleaning the oil-containing sludge using the oil-containing sludge continuous cleaning device according to claim 1, the rotary cylinder is rotated, and the oil-containing sludge is continuously supplied to the oil-containing sludge supply port of the rotary cylinder. Water and solvent are supplied into the outer cylinder from the water supply port and the solvent supply port, respectively, and the interface between the water phase and the oil phase is formed from the water phase discharge port and the oil phase discharge port, respectively, on the peripheral surface of the rotary cylinder. A method for continuously cleaning oil-bearing sludge, which discharges the aqueous phase and oil phase separated into liquid and liquid so as to be kept at a position crossing the oil-removing sludge, and continuously discharges the deoiled and water-containing sludge from a deoiling sludge outlet. . The method for continuously cleaning oil-containing sludge according to claim 6, wherein the oil phase in the outer cylinder is heated within a temperature range of 50C to 100C. The method for continuously cleaning oil-containing sludge according to claim 6, wherein the water-containing sludge continuously discharged from the deoiled sludge discharge port is continuously dewatered by using an attached continuous dewatering device. The method for continuously cleaning oil-containing sludge according to claim 6, wherein water containing a surfactant is supplied from a water supply port of the outer cylinder.

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