KR101168748B1 - Apparatus for cleaning of polluted sand and method for cleaning thereof - Google Patents

Abstract

The present invention provides a contaminant removal device for removing contaminants on media such as soil, sand and gravel contaminated with oil by absorbing oil in soil, sand, gravel, etc. using expanded graphite. A raw material supply means for supplying the medium and expanded graphite; An agitator for stirring and conveying the medium and the expanded graphite supplied from the raw material supply means so that the contaminants buried in the medium are absorbed by the expanded graphite; A separator for separating and transferring the medium and the expanded graphite separated by the buoyancy of water to the expanded graphite absorbed by the agitator and the contaminants absorbed; And an expanded graphite collecting device for collecting expanded graphite separated by buoyancy of the water.

According to the contaminant removing device and the method for removing the same according to the present invention, the soil, sand, gravel and the like can be effectively removed when contaminants of hydrocarbon compounds such as kerosene, gasoline and toluene are contaminated.

Expanded graphite, agitator, sorter, sump, screw

Description

Apparatus for cleaning of polluted sand and method for cleaning

The present invention relates to an apparatus for removing contaminants for removing oil from soil, sand and gravel contaminated with oil and the like, and more specifically, to oil, which is attached to soil, sand and gravel, using expanded graphite. The present invention relates to a contaminant removal device for removing oil from soil, sand and gravel contaminated with oil by absorbing it into expanded graphite, and a method of removing the same.

In parallel with the development of the industry, environmental pollution is also increasing proportionately, and efforts are being made to prevent it, but natural disasters and safety accidents are inevitably occurring. In particular, the outflow of oil, etc. from the sea has reached a state where the pollution range is wide and the degree of pollution is so severe that it destroys the natural ecosystem, and the level of water or soil contamination by various oil products is very serious. have.

Various chemical products and removal methods are used to solve the environmental pollution problem caused by oil pollution accidents, but most of them have a weak effect or a high price of an oil treatment agent.

Recently, a method of using expanded graphite as an effective absorbent of oil has been proposed, and the expanded graphite is known to have absorbed amount of about 25 to 50 times for various oils.

The technique of spraying the contaminated water or water by using such expanded graphite to absorb contaminants such as oil in the expanded graphite is disclosed in Korean Laid-Open Patent Publication No. 2002-77780 (October 14, 2002).

 The techniques disclosed in this publication include preparing a carbonaceous mixture of graphite containing feedstock, placing the carbonaceous mixture in a contaminated medium, and collecting the carbonaceous mixture saturated with contaminants, Positioning the carbonaceous mixture is carried out by dispersing on the surface and / or into the liquid and / or placing it on the surface and / or passing the liquid or gas through the filter and expanding the expanded graphite and carbon A mixture of vaginal nanocrystals is used as the carbonaceous mixture, wherein the content of the carbonaceous nanocrystals is 10% or more.

The technique disclosed in the above publication is to inflate expanded graphite to contaminated water or strands as mentioned above, so that the expanded graphite absorbs oil or adheres to the expanded graphite. As can remove some oil, but if the oil is contaminated with soil, sand, gravel, there is a problem that can not be removed effectively.

Accordingly, an object of the present invention has been made to solve the above-mentioned conventional problems, to provide a contaminant removal apparatus and a method for removing the contaminant which can be effectively removed when contaminants such as oil, such as soil, sand, gravel are contaminated. will be.

In addition, another object of the present invention is to provide a contaminant removal device and a method for removing the expanded graphite that can be used to remove the contaminant.

A contaminant removing device according to the present invention for achieving the above object is a contaminant removing device for removing contaminants on a medium such as soil, sand, gravel, etc., the raw material supply means for supplying the medium and expanded graphite; An agitator for stirring and conveying the medium and the expanded graphite supplied from the raw material supply means so that the contaminants buried in the medium are absorbed by the expanded graphite; A separator for separating and transferring the medium and the expanded graphite separated by the buoyancy of water to the expanded graphite absorbed by the agitator and the contaminants absorbed; And an expanded graphite collecting device for collecting expanded graphite separated by buoyancy of the water.

In addition, in the contaminant removing apparatus according to the present invention, the stirrer is a cylindrical shape is disposed inclined so that one end is a lower end, the other end is an upper portion, connected to the raw material supply means in the vicinity of the one end, the stirring A stirring tank through which the medium to be transferred and expanded graphite are transferred to the other end; A stirring screw rotatably installed inside the stirring tank; And first driving means for rotating the stirring screw.

In addition, in the contaminant removing apparatus according to the present invention, the separator is disposed inclined so that one end is lower and the other end is upper, and the medium and expanded graphite are transported by stirring from the stirring tank near the one end. A sorting tank, to which a mixture is supplied and which is provided with water supply means for supplying water in the vicinity of the other end; A conveying screw for conveying the precipitated medium in the sorting tank; Second driving means for rotating the feed screw; And a drain pipe for transferring the expanded graphite supported by the sorting tank together with the water.

In addition, in the pollutant removal device according to the present invention, the expanded graphite collecting device is characterized in that it is provided with an expanded graphite strainer to separate the expanded graphite supplied with water from the sorter.

In the contaminant removing apparatus according to the present invention, a partition wall having a height as high as the supported expanded graphite is disposed on the upper portion of the sorting tank so that the expanded graphite supported by water is not discharged together with the medium by the transfer screw. Characterized in that installed.

In addition, the contaminant removing method according to the present invention for achieving the above object is a contaminant removing method for removing contaminants on the medium, such as soil, sand, gravel with expanded graphite, the medium and the expanded graphite Raw material supply step to put into the stirrer; Stirring and conveying step of transferring the medium and the expanded graphite introduced into the stirrer while stirring the stirrer; Separating the conveyed medium and the expanded graphite absorbed by the contaminants into a separator filled with water to precipitate the medium, and supporting the expanded graphite; Transporting the precipitated medium out of the sorter and transferring the expanded graphite supported by water together with water from the sorter to the expanded graphite collecting device; And an expanded graphite recovery step of recovering the expanded graphite transported together with the water.

In addition, the pollutant removal method according to the invention, characterized in that it further comprises an expanded graphite regeneration step for purifying the contaminants from the expanded graphite recovered after the expanded graphite recovery step.

In addition, in the method for removing contaminants according to the present invention, the agitation is performed for 5 to 30 minutes.

As described above, according to the contaminant removing device and the method of removing the same, the contaminants of hydrocarbon compounds such as kerosene, gasoline, and toluene can be effectively removed in soil, sand, gravel, and the like.

In addition, according to the contaminant removal device and the removal method according to the present invention, there is also an effect that can remove a large amount of oil in a short time.

In addition, according to the pollutant removal device and the method for removing the same according to the present invention, it is possible to remove the pollutants by installing a pollutant removal device on the site of the polluted area without having to transport a large amount of soil, sand, gravel, etc. There is also.

In addition, according to the contaminant removal device and the method for removing the same according to the present invention, there is also an effect that can remove the contaminants in a medium such as soil, sand, gravel by a continuous process.

In addition, according to the contaminant removal device and the method for removing the same according to the present invention, it can be usefully used to purify contaminated water.

These and other objects and novel features of the present invention will become more apparent from the description of the present specification and the accompanying drawings.

Hereinafter, a concept of removing contaminants by the contaminant removing device and the method of removing the same according to the present invention will be described.

Table 1 shows the absorption of various oils on the expanded graphite.

Target material Absorption amount (expanded graphite g: oil g) For total absorption
Absorption amount (%) for 30 seconds     Kerosene 1: 40  95     gasoline 1: 30  95     Vegetable oil 1: 30  95     toluene 1: 40  78     Dichlorethane 1: 35 100     Carbon tetrachloride 1: 50 100

According to Table 1, all hydrocarbon compounds, such as kerosene and gasoline, are absorbed by about 30 to 50 g with respect to 1 g of expanded graphite, and the absorption rate is more than 95% (78% for toluene) in 30 seconds.

Therefore, in order to purify water or soil contaminated with oil, if the amount of expanded graphite added to the oil content is adjusted to about 20: 1 and stirred for 30 seconds or more, the oil can be effectively absorbed and removed in a short time. .

Based on this concept, when the soil is contaminated with oil, the present invention makes a suspension of expanded graphite with a solid concentration of 20 to 60% and adjusts the pH of the suspension to neutrality of 6.0 to 7.0 with alkali such as caustic soda. The mixed soil and suspension are put into a cylindrical stirring tank and stirred for 1 to 2 hours to absorb the oil contained in the soil into the expanded graphite. Then, in the tank type sorter, the soil is precipitated and the expanded graphite is floated to release the soil and the expanded graphite. By separating, oil can be removed from soil contaminated with oil.

When sand or gravel, such as aggregate, is contaminated with oil, sand and gravel contaminated with a suspension prepared with a concentration of 20 to 60% solids in the form of expanded graphite in a similar manner to the removal of oil mixed in the soil described above. After adding an appropriate amount, the mixture is stirred for 5-30 minutes in a kiln mixer, kneader mixer, barrel mixer, or drum mixer to absorb oil adsorbed on the surface of sand or gravel into the expanded graphite. In addition, by separating in the aggregate and the expanded graphite by floating the oil-absorbed expanded graphite by standing in a sorter such as Siekner, oil can be removed from sand or gravel contaminated by oil.

The constitution of the contaminant removal device that can implement the concept of the present invention for removing contaminated oil as described above will be described in detail with reference to the drawings.

1 is a conceptual diagram of an apparatus for removing contaminants according to the present invention.

In FIG. 1, reference numeral 10 denotes a stirrer for stirring the expanded graphite for absorbing the contaminated oil, such as contaminated soil, sand and gravel.

The stirrer 10 is installed inclined such that the cylindrical stirring tank 11 is horizontal or the upper end of the inlet cylinder coincides with the lower end of the discharge part, or the stirring screw also serves as a conveyor function. A rotatable hook and a stirring screw 15 are provided inside the cylindrical stirring tank 11, and are rotated by the first driving means 17 made of a motor or the like provided below the stirring tank 11.

In addition, an expansion portion for absorbing oil from the first hopper 13 and the contaminated medium 41 that supplies the medium 41 such as contaminated soil, sand, gravel, etc. in the lower portion, that is, at one end of the stirring tank 11. The second hopper 14 which supplies the graphite 43 is provided. The first hopper 13 and the second hopper 14 serve as raw material supply means for supplying the medium 41 and the expanded graphite 43 raw material.

The stirrer 10 receives the raw material of the contaminated medium 41 through the first hopper 13, and expands graphite for absorbing oil contained in the medium 41 through the second hopper 14. 43) You will be supplied with raw materials.

The contaminated medium 41 and expanded graphite 43 are transferred from the lower part of the stirring tank 11 to the upper part for 5 to 30 minutes by the rotation of the stirring screw 15 in the stirring tank 11, In the grinding process, the oil is buried in the medium 41 in the stirring process and is absorbed by the expanded graphite 43.

In Fig. 1, reference numeral 20 denotes a separator for supplying a mixture of the medium 46 from which the oil is removed from the stirring tank 11 and the expanded graphite 44 absorbing the oil to separate them.

The sorter 20 has a cylindrical bottom surface, and has a U-shaped sorting tank 21 having an open upper portion so as to have a height of a U-shaped sorter having an upper portion of the inlet portion more than twice the height of the cylinder, The lower end of the discharge cylinder is coincided with the height of the ship, and the height of the water surface is inclined so as to reach the lower end of the cylinder 2/3 of the length of the whole separator. The rotating feed screw 25 is provided inside the sorting tank 21, and is rotated by the second drive means 27 made of a motor or the like provided under the sorting tank 21.

In addition, a third hopper 23 is provided below the sorting tank 21 to supply the medium from which the oil transferred from the stirring tank 11 is removed and the expanded graphite absorbing the oil. In the vicinity of 23, expanded graphite 44 supported by the sorting water tank 21 and a drain pipe 36 for draining water are provided. A water supply pipe 26 for supplying water to the water selection tank 21 and a nozzle 28 for injecting water supplied from the water supply pipe 26 are provided between the upper portion and the middle portion of the water selection tank 21.

The sorter 20 is supplied with a mixture of oil-depleted medium and expanded graphite absorbing oil through the third hopper 23.

Since the sorting tank 21 contains water supplied from the nozzle 28, the medium 46 from which the oil supplied from the third hopper 23 is removed is settled at the bottom of the sorting tank 21, The absorbed expanded graphite 44 is supported by water.

The medium 46 from which the precipitated oil has been removed is transferred out of the sorting tank 21 by the rotation of the conveying screw 25, and the expanded graphite 43 absorbing the buoyant oil is thereafter passed through the drain pipe 36. The expanded graphite collector 30 is described.

An approximately intermediate portion of the sorting bath 21, that is, the third hopper 23 and the nozzles 28, in order to prevent the elevated expanded graphite 44 from being conveyed with the medium 41 by the conveying screw 25 here. The partition wall 29 is installed between them.

The partition 29 is installed to a depth close to the feed screw 25.

In addition, in FIG. 1, the code | symbol 30 is the expanded graphite collector 30 which filters the expanded graphite 44 which absorbed the oil supplied with water from the sorter 20. As shown in FIG.

The expanded graphite collecting device (30) is provided with a strainer (33) in the sump (31) to filter the expanded graphite (44) having absorbed oil therein.

When the expanded graphite 43 absorbing oil is mixed with water and supplied from the sorting tank 21 to the drain tank 31 through the drain pipe 36, the water passes through the strainer 33 and is discharged from the drain tank 31. The expanded graphite 43 absorbing the oil is filtered by the strainer 33. The expanded graphite 49 filtered by the strainer 33 is transported from the expanded graphite collecting device 30 by a conveying device or a conveying means (not shown) and undergoes a process of removing oil absorbed by combustion or chemical treatment.

The oil-depleted expanded graphite can be reused.

In FIG. 1, reference numeral 37 denotes a valve for controlling the amount of expanded graphite 43 conveyed with water from the drain pipe 36 to the drain tank 31 or to start or stop the transport.

Hereinafter, a method for removing contaminants according to the present invention will be described.

2 is a flowchart illustrating a process of removing contaminants according to the present invention.

The medium 41, such as soil, sand, gravel, and the like, and the expanded graphite 43, which are contaminated, are supplied to the stirring tank 11 as a raw material (S 10).

In the stirring tank 11, the contaminated medium 41 and expanded graphite 43 are transferred to the upper portion of the stirring tank 11 while stirring with the stirring screw 15 for 5 to 30 minutes (S 20). In this process, the oil contaminated with the medium 41 is absorbed by the expanded graphite 43.

The oil-depleted medium and the expanded graphite absorbing the oil are supplied to the sorting tank 21 through a third hopper 23 filled with water. The medium 46 supplied to the sorting tank 21 is precipitated at the bottom of the sorting tank 21, and the expanded graphite 44 is suspended in water to remove the oil 46 and the expanded graphite absorbing the oil ( 44 is separated, the oil-free medium 46 is transported out of the sorting tank 21 by the transfer screw 25, and the expanded graphite 43, which absorbs the oil, with the water through the drain pipe 36. It is transferred to the expanded graphite collecting device 30 (S 30).

The expanded graphite 49 absorbing the oil transported with the water is recovered by being filtered by the strainer 33 installed in the drain 31 (S 40).

The recovered graphite 49 is transported from the expanded graphite collecting device 30 by a separate transfer device, and then removes the oil absorbed by combustion or chemical treatment, thereby removing the group absorbed by the expanded graphite 49. Purify (S 50).

As mentioned above, although the invention made by this inventor was demonstrated concretely according to the said Example, this invention is not limited to the said Example and can be variously changed in the range which does not deviate from the summary.

In the above-described embodiment, the media 41 and the expanded graphite 43 have been described in a kiln mixer (Kilder Mixer) method in which the stirring screw 15 is agitated, but the kneader mixer or barrel mixer It is of course possible to stir in the drum mixer.

In addition, in the above-described embodiment, only the contaminated medium 41 has been described, but by supplying contaminated water through the water supply pipe 26 of the sorter 20 instead of clean water, contaminated with the contaminated medium 41. You can cleanse at the same time. In this case, it is effective to install the nozzle 28 between the third hopper 23 and the partition wall 29 to supply the contaminated water from the inside of the partition wall 29.

The pollutant removal device and pollutant removal method according to the present invention can be usefully used to remove contaminants contaminated with soil, sand, gravel, and the like.

It can also be usefully used to purify contaminated water.

1 is a conceptual diagram of a pollutant removal device according to the present invention

2 is a flowchart illustrating a process of removing contaminants according to the present invention.

* Description of the symbols for the main parts of the drawings *

10: Stirrer 11: Stirring Tank

15: stirring screw 13, 14, 23: hopper

20: sorter 21: sorting tank

25 feed screw 26 feed water pipe

30: expanded graphite collecting device 31: sump

33: strainer 36: drain pipe

Claims (8)

In the contaminant removal device for removing oil on the medium such as soil, sand, gravel, Raw material supply means for supplying the medium and expanded graphite; An agitator for transporting the medium and the expanded graphite supplied from the raw material supply means with stirring so that oil adhered to the medium is absorbed into the expanded graphite; The medium is precipitated and transported by the stirrer and the expanded graphite absorbed by the oil is precipitated by the buoyancy of water and the medium is precipitated and the expanded graphite is separated from each other to transfer the expanded graphite absorbed by the medium and the oil respectively. Selector; And An expanded graphite collecting device for collecting expanded graphite mixed with water in a state separated from the medium; Pollutant removal apparatus comprising a. The method of claim 1, The stirrer A stirring tank in which one end is inclined and the other end is inclined so as to be in a cylindrical shape, connected to the raw material supply means near the one end, and the stirring tank in which the agitated medium and the expanded graphite are transferred to the other end; A stirring screw rotatably installed inside the stirring tank; And First driving means for rotating the stirring screw; Pollutant removal apparatus comprising a. The method of claim 1, The sorting machine One end is inclined so that the other end is inclined, and the mixture of the medium and the expanded graphite, which is agitated from the stirring tank and is transported near the one end, is supplied, and water for supplying water in the vicinity of the other end. A sorting tank in which a supply means is installed; A conveying screw for conveying the precipitated medium in the sorting tank; Second driving means for rotating the feed screw; And A drain pipe for conveying the expanded graphite floated in the sorting tank together with water; Pollutant removal apparatus comprising a. The method of claim 3, And said expanded graphite collecting device comprises an expanded graphite strainer for separating expanded graphite supplied with water from said sorter. 5. The method of claim 4, The contaminant removing apparatus of the sorting tank is provided with a partition wall to a depth close to the conveying screw so that the expanded graphite floated by water is not conveyed with the medium by the conveying screw. In the contaminant removal method for removing oil on the medium such as soil, sand, gravel with expanded graphite, A raw material supply step of introducing the oil-contaminated medium and the expanded graphite into a stirrer; Stirring and conveying the agitated medium and the expanded graphite while absorbing the oil contaminated with the medium while absorbing the expanded graphite; A separation step in which the agitated conveyed medium and expanded graphite absorbed by oil are introduced into a water-filled sorter to precipitate the medium, and the expanded graphite absorbed by oil is floated by buoyancy of water; Transporting the precipitated medium out of the separator and transferring the expanded graphite floated by the buoyancy of water together with water from the separator to the expanded graphite collecting device; And An expanded graphite recovery step of recovering the expanded graphite transported with the water; Pollutant removal method comprising a. The method according to claim 6, And further including an expanded graphite regeneration step of purifying oil from the expanded graphite recovered after the expanded graphite recovery step. The method according to claim 6 or 7, The stirring method for removing contaminants, characterized in that for 5 to 30 minutes.

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