KR20080008154A - Apparatus for purifying contaminated soil, method therefor, pre-heater feeding device and rotary kiln type purifying device used to them - Google Patents

Abstract

An apparatus and a method for purifying contaminated soil, and a pre-heating dryer and a rotary kiln used in the apparatus are provided to improve the efficiency in restoration of the contaminated soil, by installing a preheating dryer at the front of a rotary kiln so as to perform pretreatment work for drying the contaminated soil. A preheating dryer(10) preheats contaminated soil by hot air while the contaminated soil is stirred and transported by a screw. A rotary kiln(20) pyrolyzes and purifies the preheated soil, which is inputted into a rotary drum. A soil treatment unit is connected to an end of the rotary kiln to discharge the purified soil. A hot air supply unit(50) supplies hot air into the rotary kiln and the preheating dryer in a direction contrary to a transport direction of the contaminated soil. A particulate gas exhaust unit(60) is connected to an inlet side of the preheating dryer, into which the contaminated soil is inputted, to exhaust pyrolyzed gas and minute soil together with the hot air. A particulate separation unit(70) is connected to the particulate discharge unit to separate the soil into the particulate soil and the gas. Further, a plurality of rotating drum of the rotary kiln are connected each other in multi-stage style.

Description

TECHNICAL FIELD The present invention relates to a contaminated soil purification system and method, a preheating dryer and a rotary kiln used therefor, a method therefor, a pre-heater feeding device and a rotary kiln type purifying device used to them,

1 shows a basic configuration of a contaminated soil purification system according to the present invention,

2 to 4C are views showing a preheater dryer according to the present invention,

Fig. 2 is an internal structural view seen from the side,

Figure 3 is a plan view,

4A is a view seen from the "A" direction in Fig. 2,

FIG. 4B is a cross-sectional view taken along the line B-B in FIG. 2,

4C is a cross-sectional view taken along the line C-C in Fig. 3,

Figures 5 to 6 show a rotary kiln according to the present invention,

Fig. 5 is an internal structural view seen from the side,

Fig. 6 is a cross-sectional view along the line D-D in Fig. 5,

FIG. 7 is a system configuration diagram showing a modified embodiment of the contaminated soil purification system according to the present invention,

Figure 8 is a flow chart showing the contaminated soil transfer path according to the present invention,

FIG. 9 is a flowchart showing a flow path of air including hot air according to the present invention,

10 is a detailed view showing a multi-stage rotary kiln according to the present invention,

11 is a view showing the flow of hot air in the multi-stage rotary kiln shown in Fig. 10,

12 is a system configuration diagram showing another modified embodiment of the contaminated soil purification system according to the present invention,

13 is a system configuration diagram showing yet another modified embodiment of the contaminated soil purification system according to the present invention.

Description of the Related Art

1: Feed hopper 3: Belt conveyor

5: Vibrating screen 7: Flex belt conveyor

10: Preheating dryer 11: Casing

12a: contaminated soil inlet 12b: contaminated soil outlet

13a: hot air inlet 13b: hot air outlet

14: screw 15: hot air blowing means

15a: injection pipe 15b: nozzle

15c: blowing hot air supply line 15d: minute blowing fan

16: Inspection door 17: Driving means

20: rotary kiln 20a: inlet

20b: outlet 21: rotary drum

21c: Insulation material 23: Spiral conveyance part

25: baffle 25a:

27: rotary rail 28: driven gear

32: support roller 34: drive motor

35: driven gear 43: screw conveyor

45: Belt conveyor 50: Hot air supply device

51: burner 52: pressurized blower

55: hot air circulation line 60: particulate gas discharge device

61: gas discharge line 63: heat exchanger

70: Particulate separation device 71: Cyclone dust collector

73: bag filter 74: manned blower

75: gas purifier 77: outlet

80: soil exhaust gas inlet pipe 90: exhaust air inlet pipe

100: TSVE 150: BP

200: multi-stage rotary kiln 211, 212, 213: rotary drum

231, 232, 233: connection transfer section 251, 252, 253: frame

261, 262, 263: hot air connection line

The present invention relates to a contaminated soil purification system and method for purifying and restoring contaminated soil, and more particularly, to a contaminated soil purification system and method capable of economically and efficiently restoring contaminated soil using hot wind such as waste heat, Dryer and rotary kiln.

In general, soil contamination is a phenomenon in which pollutants that penetrate underground pollute soil or ground water. In the past, pollution caused by heavy metals such as mining area or nuclear waste treatment area was the mainstream, but recently, It is becoming a serious environmental problem due to the increased pollution caused by oil generated in military districts, semiconductor factories, dry cleaning, paint factories and gas stations.

In this way, the techniques for restoration or purification of soil polluted by oil and the like are classified into physical, chemical and biological techniques according to restoration methods, and in-situ and ex-situ treatment are performed according to restoration positions. Technology. It can be classified into soil and groundwater depending on the polluted medium.

Among these, in-situ purification methods include soil vapor extraction, bio-venting, bio-sparging, soil washing, and permeable reaction walls.

Soil Vapor Extraction (SVE) can remove gaseous contaminants by using vacuum and pressure when contaminating soil is contaminated with vaporable pollutants. For this purpose, the injection and extraction wells are installed Vacuum is applied to extract and remove volatile, semi-volatile contaminants from contaminated soil.

The above-mentioned bio-venting (BV) is a technology for activating biodegradation of a petroleum hydrocarbon contained in soil by promoting the activity of indigenous microorganisms in the soil by injecting air (oxygen) or nutrients.

Biosparging is a technique for volatilizing and removing air and microorganisms by injecting air and microorganisms into a saturated aquifer. The injected air and microorganisms are moved horizontally and vertically through soil pores, . It is desirable to increase the operating speed to increase the contact between the groundwater and the soil, and a large amount of groundwater is purified by air dispersion and pollutant-degrading microorganisms.

 Soil flushing is an important technique to increase the solubility of pollutants by injecting water or pure water containing additives into soil and groundwater to leach pollutants. Generally, pure water, surfactant, etc. are used, and water is mainly used for cleaning hydrophilic pollutants and surfactants for cleaning hydrophobic pollutants.

The permeable reaction barriers (PRBs) allow the chemical reaction of the reaction medium and the contaminants to be induced by using the hydraulic flow of the groundwater pollution zone by installing a permeable reaction wall on the ground where the pollution zone exists, As a technology, the reaction wall can be purified at the position while maintaining the flow of polluted ground water, so it is an economical method that does not require any power in the post treatment and purification process. Especially, it is a technology that can purify pollution within a short time and it is possible to purify without changing groundwater flow when continuous groundwater pollution is expected.

Next, the method of ex-situ purification includes biopile, soil cultivation, soil washing, thermal desorption, and the like.

The bio-pile is a technique for removing contaminants by periodically spraying air, nutrients, microorganisms, etc. in order to excavate contaminated soil, install it in pile or cell form, and increase microbial activity.

Land-farming is one of the biodegradation methods for digesting contaminants by promoting the activity of indigenous microorganisms in the soil by excavating and transporting the contaminated soil. The soil is excavated, laid on the ground surface, It is a technology using a biodegradation process that supplies nutrients and moisture to the microorganisms to supply air by turning them over.

Soil Washing is a technique for excavating contaminated soil and separating organic and inorganic contaminants attached to the surface of soil particles into washing liquid, concentrating it in the soil, disposing it, or treating it with conventional wastewater treatment method.

The thermal desorption is a technique for removing contaminants from the soil at a soil temperature of 500 ° C or lower under oxygen or anoxic conditions. It is possible to remove volatile and quasi-volatile organics, organic chlorine and organic phosphorus pesticides, It is a technology that has high efficiency, short processing time, less gas generation compared to incineration, and does not generate dioxin and furan.

However, the conventional techniques for restoring or purifying various contaminated soil have the following problems.

First, since each treatment purification method is used separately, there is a problem that it is difficult to effectively integrate and treat contaminated soil of various conditions.

Also, since the devices used for each processing method are installed as fixed structures at certain positions, it is not easy to move and reuse the system, and accordingly, a considerable cost is required to install, use, store, and dismantle the facilities.

In addition, since the waste gas discharged from each treatment method and the heat source purified from the gas treated are not reused, additional facilities for treating the waste heat are required, which is disadvantageous in terms of economy.

Also, in the conventional treatment method, there is a system for decomposing pollutants by providing hot air or the like to the pollutants, but there is a problem that there is a limit in recovering and restoring the polluted soil more effectively.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above problems, and it is an object of the present invention to provide a contaminated soil purification system and method capable of enhancing the recovery efficiency of contaminated soil by providing a preheating dryer in front of a rotary kiln to perform pre- The purpose is to do.

Another object of the present invention is to provide a contaminated soil purification system and method capable of economically and efficiently restoring contaminated soil by increasing the heat exchange efficiency by reversing the traveling direction of the contaminated soil and the hot air, .

The present invention also relates to a method for treating contaminated soil, contaminated ground water, and contaminated soil that can easily treat waste gas without requiring a separate waste gas treating device by treating the extracted waste gas discharged from contaminated soil, contaminated ground water, Another object is to provide a purification system and method.

In addition, the present invention provides hot air that is purified and discharged from the system of the present invention to be supplied to contaminated soil, contaminated ground water, and underground contaminated soil deposited on the ground, so that a single soil It is another object of the present invention to provide a contaminated soil purification system and method capable of more efficiently purifying and restoring contaminated soil in the ground or ground in a restoration system.

In addition, the contaminated soil purification system and method according to the present invention can be used together with known contaminated soil remediation systems and methods to effectively regenerate contaminated soil according to various conditions, ≪ / RTI >

Next, the present invention provides a preheating dryer for a contaminated soil purification system in which a hot air blowing mechanism or the like is additionally provided in the casing to further improve the heat exchange capacity between hot air and contaminated soil to improve the drying efficiency of contaminated soil There is a purpose.

Next, the present invention relates to a contaminated soil purification system capable of maximizing the contact between contaminated soil and hot air to form a spiral transfer part and a plurality of baffles in a rotary drum, The purpose is to provide a rotary kiln.

The present invention also provides a multi-stage continuous structure, which can effectively improve the treatment efficiency of contaminated soil by effectively performing the time, space, and temperature control necessary for purification according to the condition of the contaminated soil, There is another purpose in providing the kiln.

Further, according to the present invention, it is possible to easily move and install the contaminated soil restoration system by installing the rotary kiln on the trailer, to easily reuse after moving the restoration system, to improve compatibility with other restoration systems, Another object of the present invention is to provide a rotary kiln of a contaminated soil purification system that can be easily used by adjusting the capacity of a rotary kiln or the like when necessary in a multi-stage structure capable of being detachably attached.

According to an aspect of the present invention, there is provided a contaminated soil purification system including: a preheater for preheating a contaminated soil introduced into the interior of the soil by hot air while being disturbed by a screw device; A rotary kiln for purifying contaminated soil introduced into the rotary drum through heating and decomposing after passing through the preheating dryer; A purified soil treatment device connected to an end of the rotary kiln to discharge and treat the purified soil; A hot air supply device for supplying hot air into the rotary kiln and the preheating dryer in a direction opposite to the conveying direction of the contaminated soil; A particulate gas discharge device connected to the contaminated soil inlet of the preheater to discharge the pyrolysis gas and the fine particles together with the hot air; And a particulate separation device connected to the particulate gas discharge device for separating and processing the fine particles of the soil and the gas.

The rotary kiln may be configured such that a plurality of rotary drums are interconnected in a multi-stage manner.

Further, it is preferable that the rotary kiln is provided in the trailer so that the rotary kiln can be easily moved.

It is preferable that the rotary kiln is connected to a soil exhaust gas inflow pipe so that contaminated soil deposited on the ground, contaminated ground water, and extracted waste gas discharged from the soil contaminated with soil can be treated and treated.

The hot air supply device is connected to the rotary kiln after branched from the middle of the particulate gas discharge device to circulate and supply hot air, and a burner and a blower for providing hot air on the path through which the hot air is circulated desirable.

The particulate separation device is preferably configured to separate fine soil and gas using a cyclone dust collector and a bag filter.

 The apparatus for separating fine particles further comprises a gas purifying device for purifying the separated gas, wherein the air discharged from the gas purifying device is supplied to a contaminated soil, contaminated ground water, .

Preferably, the exhaust air injection pipe is provided with a heat exchanger for heating the injection air.

A method for purifying contaminated soil using the contaminated soil purifying apparatus according to the present invention for realizing the above object is characterized in that the pre-heating dryer and the contaminated soil to be purified into the rotary kiln A soil supply step for passing the soil; And a hot air supplying step of supplying hot air to the rotary kiln and the preheating dryer in a direction opposite to the traveling direction of the contaminated soil to purify the contaminated soil.

In the hot air supply step, it is preferable that the hot air is introduced into the preheater after passing through the rotary kiln. At this time, it is preferable that some of the hot air flowing into the preheat dryer after passing through the rotary kiln is concentratedly injected into the preheater dryer using a separate jet line and a blower.

And discharging the hot air, pyrolysis gas and fine particle soil discharged through the hot air supply step to the particulate gas discharge device, and supplying a part of the hot air to the inside of the rotary kiln again Do.

The method also includes forcing hot air into the contaminated soil to be cleaned; And injecting waste gas and contaminants discharged through the step into the rotary kiln and treating the waste.

At this time, the hot air used in the step of forcibly supplying the hot air to the contaminated soil to be purified may use air discharged while passing through the particulate gas discharging device.

In order to achieve the above object, the preheater dryer of the contaminated soil purification system according to the present invention comprises: a casing formed of a long channel structure and provided with input and discharge ports for contaminated soil on both sides; A soil conveying mechanism provided in the casing for moving the contaminated soil introduced through the inlet to the outlet; Hot air supply means for supplying heated air in a direction opposite to the traveling direction of the contaminated soil so that the contaminated soil passing through the casing can be dried; And hot air blowing means provided in the casing separately from the hot air supplying means and provided with a plurality of nozzles to supply hot air to the soil passing through the casing while forcibly injecting hot air.

The soil conveying mechanism may include a pair of screws installed side by side in the casing and rotating in mutually facing directions, and driving means for driving the pair of screws.

Preferably, the hot air jetting means comprises a jet pipe extending along the longitudinal direction of the casing and a plurality of nozzles provided on the jet pipe.

A rotary kiln of a contaminated soil purification system according to the present invention for realizing the above-mentioned problems comprises a rotary drum having an inlet through which contaminated soil is introduced into one side and an outlet through which contaminated soil is discharged to the other side; Supporting means for rotatably supporting the rotary drum; And a drum driving means provided in the supporting means for rotationally driving the rotary drum. In the rotary drum, a spiral conveying portion provided in the inlet port and formed in a spiral structure to convey the contaminated soil introduced into the rotary drum, Wherein a plurality of baffles are disposed at a position next to the spiral conveying portion to convey the soil while disturbing the contaminated soil.

It is preferable that a plurality of rotary drums are disposed in a multistage structure in a zigzag manner and a plurality of rotary drums are provided with a connection conveying unit for interconnecting the drums to guide the contaminated soil to the next drum.

At this time, the rotary drums are installed in the respective frames, and the drum driving means may be separately installed in the respective frames.

Preferably, the rotary drum is arranged to be inclined downward from the inlet toward the outlet.

The rotary drum is preferably configured to be capable of supplying hot air in a direction opposite to the conveying direction of the contaminated soil.

It is preferable that the rotary drum is formed in a double wall structure and a heat insulating material is provided therebetween.

And the spiral transfer part is formed to have a structure protruding at a predetermined height from the inner surface of the rotary drum.

Preferably, the baffle is formed in a long plate structure and is long in the longitudinal direction of the rotary drum, and the end of the baffle is formed to be inclined upward at a predetermined angle in the rotation direction of the drum.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a diagram showing a basic configuration of a contaminated soil purification system according to the present invention.

The contaminated soil purification system according to the present invention is characterized in that the contaminated soil purification system comprises a feed hopper 1, a belt conveyor 3, a vibration screen 5, a flex belt conveyor 7, a preheating drier 10, The kiln 20, the screw conveyor 43, and the belt conveyor 45 in this order.

Also, the contaminated soil purification system according to the present invention is configured such that a hot air supply device 50, a particulate gas discharge device 60, and a particulate separation device 70 are connected to the above configuration.

The main components of the polluted soil purification system according to the present invention will be described in order.

The input hopper 1 is a device for inputting the contaminated soil Sc using equipment such as a payloader PL and a back hoe and is capable of transporting contaminated soil, The belt conveyor 3 is constituted.

The vibrating screen 5 is a device for filtering gravel or the like having a predetermined thickness and passing through the contaminated soil Sc inputted into the input hopper 1. The vibrating screen 5 may be a screen having a mesh structure of a predetermined size, So that the gravels contained in the contaminated soil can be quickly sorted and separated.

The flex belt conveyor 7 is a device for transferring contaminated soil having a predetermined thickness or less through the vibration screen 5 to the preheater 10 and is installed in a preheater drier 10). ≪ / RTI > Of course, instead of the flex belt conveyor 7, any one of various commonly used conveyance mechanisms may be adopted according to the conditions of operation.

The preheating dryer 10 is a device for preheating the contaminated soil introduced into the interior of the rotary kiln 20 through the flex belt conveyor 7 by hot air while being disturbed by a screw device. And functions as a pretreatment device for drying moisture and the like contained in the contaminated soil.

The preheater 10 may be installed in the trailer T together with the rotary kiln 20, but may be installed separately using additional structures.

A more detailed structure of the preheater 10 will be described in detail below with reference to Figs. 2 to 4C.

Next, the rotary kiln 20 is a device for purifying the contaminated soil while heating and decomposing contaminants in the contaminated soil introduced into the rotary drum 21 after passing through the preheating dryer 10.

It is preferable that the rotary kiln 20 is mounted on the trailer T so that the rotary kiln 20 can be easily moved as shown in FIG.

A more detailed structural description of the rotary kiln 20 will be described below with reference to Figs. 5 to 6. Fig.

The cleaned soil treatment apparatus 40 is connected to the end of the rotary kiln 20 to discharge the purified soil to the outside and processes the treated soil. The cleaned soil treatment apparatus 40 includes a discharge chamber 41 provided at the end of the rotary kiln 20, A screw conveyor 43 positioned below the discharge chamber 41 for transporting purified soil while mixing therewith, and a belt conveyor 45 for depositing the purified soil Sp in a specific space.

The hot air supply device 50 is configured to supply hot air to the rotary kiln 20 and the preheater 10 in a direction opposite to the direction of transport of the contaminated soil. And then connected to the rotary kiln 20 to circulate and supply hot air.

Of course, a heater such as a burner 51 for providing hot air is provided on the path for circulating the hot air, and a press-in blower 52 for forcibly circulating hot air is provided.

Next, the particulate gas discharging device 60 is connected to the contaminated soil inlet 12a of the preheater 10 or the inlet 22 of the rotary kiln 20 so that pyrolysis gas and fine particle soils together with the hot air To be discharged.

1, the pre-heating dryer 10 and the gas outlet line 61 connected to the inlet of the rotary kiln 20 by the particulate separation device 70 have. The gas discharge line 61 constitutes a part of the hot air circulation line 55 of the hot air supply device 50 described above.

Next, the particulate separation device 70 is connected to the particulate gas discharge device 60 and separates and processes the fine particles of the fine particles discharged from the preheat dryer 10 or the rotary kiln 20.

The particulate separation device 70 is configured to separate fine soil and gas by using a cyclone dust collector 71 and a bag filter 73. The particulate separation device 70 is provided with an induction blower 74, And a gas purifying device (not shown).

The fine soil discharged from the dust collector is discharged to the lower belt conveyor 72, and the gas and the fine dust are discharged through the upper gas line 71a And is discharged to the bag filter 73 side.

The bag filter 73 is a device for removing fine particles contained in the gas. Particles that have not passed through the filter are discharged to the belt conveyor 72 through the screw conveyor 73a. And is discharged to the outside by the blower 74.

In FIG. 1, reference numeral Sp 'denotes a micro-cleaned soil separated from the cyclone dust collector 71 and the bag filter 73.

An apparatus for purifying the gas discharged from the bag filter 73 will be described with reference to FIG.

The operation of the contaminated soil purification system according to the present invention as described above is similar to the operation of the embodiment shown in FIGS. 7 to 9, and will be described with reference to FIGS. 7 to 9. Hereinafter, The preheater 10 and the rotary kiln 20, which are the main components of the system according to the present invention, will be described in detail with reference to FIGS. 2 to 6. FIG.

First, a preheater 10 according to the present invention will be described with reference to FIGS. 2 to 4C.

2 to 4C are diagrams showing a preheater dryer according to the present invention, FIG. 2 is an internal structural view from a side view, FIG. 3 is a plan view, FIG. 4A is a view seen from the "A" Fig. 4C is a cross-sectional view in the CC line direction of Fig. 3; Fig.

As shown in the drawings, the preheater 10 according to the present invention includes a casing 11 formed with a long channel structure and provided with inlet 12a and outlet 12b for contaminated soil on both sides thereof, A soil conveying mechanism composed of a screw 14 or the like so as to move the contaminated soil put in through the inlet 12a to the outlet 12b and to allow the contaminated soil to be dried when passing through the casing 11 Hot air supply means 13a and 13b for supplying heated air in a direction opposite to the traveling direction of the contaminated soil and a plurality of nozzles 15b provided in the casing 11 separately from the hot air supply means And hot air blowing means (15) for supplying hot air to the soil passing through the casing (11) while forcibly injecting hot air.

Each of the constitutions of the preheater 10 configured as described above will be described in detail.

First, the casing 11 is formed in a long cylindrical shape, and is formed into a substantially rectangular tube-like structure as shown in FIGS. 4A to 4C, and a lower portion is formed in a rounded structure.

In the casing 11, the hot air outlet 13b is positioned at the upper left corner of the drawing, and the contaminated soil inlet 12a is located beside the hot air outlet 13b. The hot air inlet 13a is positioned on the right side of the drawing, and the contaminated soil outlet 12b preheated on the lower side is located.

In addition, the casing 11 is provided with a plurality of inspection doors 16 on its upper and side surfaces so as to inspect or repair the inside thereof.

Next, the soil conveying mechanism is composed of a pair of screws 14 installed side by side in the casing 11 and rotating in mutually facing directions, and driving means 17 for driving the screws.

The driving means 17 is installed on the left side surface of the casing 11 so as to rotate the screw 14. The driving means 17 includes a driving motor 17a, And a power transmission mechanism 17b such as a gear and a chain for transmitting the power to the pair of screws 14. [

The pair of screws 14 are rotatably supported by bearings or the like at both ends of the casing 11. The rotation direction of the pair of screws 14 and the shape of the vanes are configured to transfer the contaminated soil introduced into the casing 11 toward the discharge port 12b.

Next, the hot air supply means includes a hot air inlet 13a formed on one side (right side in the figure) of the casing 11 and a hot air outlet 13a formed on the other side (left side in the figure) 13b, and the hot air supplied to the hot air inlet 13a is preferably introduced from the rotary kiln 20 of FIG. 1 described above.

Of course, the hot air introduced into the preheater 10 of the present invention is not limited to the one that flows through the rotary kiln 20, and may be configured to be introduced through a separate hot air supply device depending on the operating conditions.

The hot air discharge port 13b is connected to the gas discharge line 61 of the particulate gas discharge device 60 of FIG. 1 to discharge the pyrolysis gas and fine particles passing through the preheater 10, Lt; / RTI >

Next, the hot air blowing means 15 is one of the main characteristic constituent parts of the preheater 10 according to the present invention, and is constituted by a pair of jet pipes 15a elongated along the longitudinal direction of the casing 11 do.

It is preferable that the pair of injection pipes 15a are installed on both sides of the upper portion of the casing 11 one by one and the hot air is concentrated in the lower part of each injection pipe 15a in the direction of the pair of screws 14. [ A plurality of nozzles 15b are provided so that the nozzles 15b can be supplied.

The structure for supplying the hot air to the injection pipe 15a is such that the hot air discharged from the rotary kiln 20 of FIG. 1 is forcibly injected by using the blower 15d of FIG. 10 desirable. 10, a spray hot air supply line 15c to be described later is provided between the rotary kiln 20 and the spray pipe 15a, and the blowing fan 15d is provided on the spray hot air supply line 15c, Respectively.

In this case, it is also possible to adopt a structure in which hot air is supplied separately without being connected to the rotary kiln 20.

The preheater 10 according to the present invention may be installed with the rotary kiln 20 using a supporting structure in the trailer T shown in FIG. The support structure may be separately constructed.

In the preheating dryer 10 according to the present invention as described above, the contaminated soil is introduced into the soil discharge port 12a through the pair of screws 14 rotating in the interior of the casing 11 through the soil inlet 12a of the casing 11 12b.

On the contrary, the hot air is supplied through the hot air inflow port 13a in a direction opposite to the traveling direction of the contaminated soil, the contaminated soil is preheated and dried, and then discharged together with the fine particles through the hot air outlet 13b. At this time, hot air is concentratedly injected into the contaminated soil conveyed by the screw 14 through the injection pipe 15a, and the contaminated soil is preheated and dried, and then discharged through the hot air outlet 13b.

In the preheater 10 of the present invention, the contaminated soil is operated so that the direction of conveyance of the contaminated soil is opposite to that of the hot air, and the contaminated soil is disturbed by the screw 14 and hot air comes into contact therewith. The hot air is concentratedly injected into the contaminated soil in the direction perpendicular to the transport direction of the contaminated soil through the injection pipe 15a to provide hot air, , The effect of preheating drying of contaminated soil can be further enhanced.

Next, the rotary kiln 20 provided next to the preheating dryer 10 will be described with reference to Figs. 5 to 6. Fig. For reference, the rotary kiln 20 of the present invention may be composed of only one or a plurality of the rotary kilns 20 may be constructed in a multi-stage manner. Here, the basic structure of the rotary kiln 20 will be described, Will be described in detail later with reference to Figs. 7, 10 and 11. Fig.

5 to 6 are views showing a rotary kiln 20 according to the present invention, FIG. 5 is an internal structural view from a side view, FIG. 6 is a transverse sectional view and partial detail view in a D-D line direction of FIG.

As shown in the figure, the rotary kiln 20 according to the present invention has a rotary kiln 20 having an inlet 20a through which contaminant soil is introduced into one side and an outlet 20b through which contaminant soil is discharged to the other side. A supporting means for rotatably supporting the rotary drum 21 and a drum driving means provided on the supporting means for rotating the rotary drum 21. [

The constituent parts of the rotary kiln 20 constructed as described above will be described in detail.

Preferably, the rotary drum 21 is formed in a long cylindrical shape and is disposed downwardly inclined from the inlet 20a toward the outlet 20b. The rotary drum 21 has a spiral conveying portion 23 for conveying the contaminated soil, Baffles 25 are provided. And a rotary rail 27 and a driven gear 28 are provided so as to be rotatable to the outside.

The rotary drum 21 is configured to be capable of supplying hot air in a direction opposite to the conveying direction of the contaminated soil and is formed of a double wall structure 21a or 21b such as an iron plate as shown in an enlarged view of FIG. A heat insulating material 21c made of ceramic wool or the like is provided.

The spiral conveying part 23 provided inside the rotary drum 21 is provided at the inlet 20a of the rotary drum and is formed in a spiral structure to convey the contaminated soil introduced into the rotary drum. It is preferable that the spiral transfer part 23 is formed to have a structure protruding at a predetermined height from the inner surface of the rotary drum 21. [

A plurality of baffles (25) are provided at a position next to the spiral conveyance part (23) to disturb contaminated soil. The baffle 25 is formed in a long plate shape and is long in the longitudinal direction of the rotary drum 21. The end of the baffle 25 is formed to be inclined upward by a predetermined angle (for example, 45 degrees) in the rotational direction of the drum .

6, the baffles 25 are preferably arranged radially within the rotary drum 21, and each baffle 25 includes a bracket 24 fixed to the inside of the rotary drum 21, And the other end is formed with an inclined portion 25a so as to move the contaminated soil upward.

1, the supporting means comprises a frame 30 provided with a trailer T, and a supporting member 30 having a structure in which the rotary drum 21 is rotatably supported on a top of a trailer T in this embodiment. A pair of support rollers 32 for supporting a pair of rotary rails 27 provided on the rotary drum 21 are provided on the front and rear sides of the rotary drum 21, do.

1, the drum driving means includes a driving motor 34 mounted on the frame 30 and a driving motor 34 for driving the driving motor 34 to rotate the driven gear 28 And a driving gear 35 for transmitting the driving force.

The rotary kiln 20 configured as described above is cleaned by contacting the contaminated soil that has flowed into the preheater 10 through the preheating dryer 10 in a high temperature environment with hot air. The contaminated soil flowing into the rotary kiln 20 is sent to the spiral conveying unit 23 And the baffle 25 to the discharge port 12b while being contacted with the hot air flowing in the opposite direction, the contaminants are heated and decomposed to be purified.

At this time, the spiral conveyance portion 23 gradually moves the contaminated soil, and the inclined portion 25a is formed at the end of the baffle 25. Therefore, the contaminated soil is effectively mixed with the disturbance in the drum, .

A modified embodiment using the basic configuration of the contaminated soil purification system according to the present invention will be described as follows.

7 is a system configuration diagram showing a modified embodiment of the contaminated soil purification system according to the present invention.

In the modified embodiment according to the present invention, the rotary kiln 200 is basically similar to that of the embodiment of FIG. 1 described above except that the rotary kiln 200 has a multi-stage construction, a structure for purifying the waste gas extracted from contaminated soil in the ground or the ground, Is injected into the contaminated soil.

For reference, the same reference numerals are given to the same or similar portions as those described in the above-mentioned basic embodiment, and a detailed description thereof will be omitted and the other portions will be mainly described.

The structure of the embodiment of the present invention shown in Fig. 7 is similar to that of the embodiment of Fig. 1 except that the feed hopper 1, the belt conveyor 3, the vibration screen 5, the flex belt conveyor A preheating dryer 10, a multi-stage rotary kiln 200, a screw conveyor 43, and a belt conveyor 45 in this order.

The hot air supply device 50, the fine particle gas discharging device 60 and the fine particle separating device 70 are connected to the above-described configuration, and the extracted waste gas discharged from the contaminated soil is introduced into the multi- And a discharge air injection pipe 90 for supplying the gas discharged from the particulate separation device 70 into the contaminated soil.

The structure of the present embodiment is different from that of the previous embodiment.

First, the pre-heating dryer 10 and the multi-stage rotary kiln 200 are installed in a multi-stage structure on the upper part of the trailer T. The detailed construction and operation of the preheater 10 and the multi-stage rotary kiln 200 will be described in detail below with reference to FIGS. 10 and 11. FIG.

7, the hot air supply device 50 is connected to the rotary kiln 200 after being branched at the middle of the particulate gas discharge device 60, so that hot air is circulated through the hot air circulation line A heat exchanger 63, a burner 51 for supplying hot air, and a pressurized blower 52 are provided at certain positions on the path through which the hot air circulates.

Next, the soil exhaust gas inflow pipe 80 is configured to allow the extracted waste gas discharged from the contaminated soil deposited on the ground, the contaminated ground water, or the soil contaminated with the soil to flow into the multi-stage rotary kiln 200 to be treated.

In general, techniques for restoration or purification of contaminated soil can be classified into an in-situ purification method and an ex-situ purification method. In FIG. 7, reference numeral 100 denotes in-situ (SVE), and reference numeral 150 is an example of a bio-pile method among the ex-situ purification methods.

The soil vapor extraction method and the biofilm method install air injection wells 110 and 160 and waste gas extraction wells 120 and 170 in contaminated soil, ground water, or contaminated soil excavated on the ground. In particular, the waste gas discharged through the waste gas extraction tanks 120 and 170 is purified by installing post-treatment equipment separately for preventing air pollution. In the present invention, Volatile contaminants discharged from contaminated soil or the like by connecting the rotary kiln 200 and the particulate gas discharging device 60 and the particulate separating device 70 connected to the rotary kilns 120 and 170, The system can be easily processed.

In the above description, only the soil vapor extraction method and the biopile method have been described. However, the method of treating pollutants such as waste gas generated from polluted soil by connecting the soil exhaust gas inflow pipe 80 to the rotary kiln 200 is as follows But it can also be applied to various schemes.

In-situ purification methods include thermal SVE using heat, bio-venting to remove pollutants by promoting the activity of indigenous microorganisms living in soil by injecting air (oxygen) or nutrients Bio-Venting (BV) is a technology mainly used for groundwater purification. It is applied to bio sparging or air sparging which volatilizes and removes contaminants by forcing air and microorganisms into a saturated aquifer. can do.

Ex-situ purification methods can be applied to the above-described biopile method, thermal desorption method in which contaminants are removed from the soil under oxygen or oxygen-free conditions, generally at a soil temperature of 500 ° C or lower .

As described above, the method of treating the extracted waste gas and contaminants through the soil exhaust gas inflow pipe 80 is not a rotary kiln 200 having a multi-stage structure but a system having one rotary kiln 20 shown in FIG. Of course.

Next, the particulate separation device 70 is composed of a cyclone dust collector 71, a bag filter 73, and a gas purifier 75. Here, the gas purifier 75 may be an apparatus such as an active carbon tower, which purifies and discharges the polluted gas using activated carbon or the like.

Next, the discharge air injection pipe 90 is configured to supply the air discharged from the gas purifier 75 to the contaminated soil deposited on the ground, the contaminated ground water, or the soil contaminated with soil.

The exhaust air injection pipe 90 may be provided with a heat exchanger 90 for heating the injection air.

As shown in FIG. 7, the exhaust air injection pipe 90 is constructed to use the waste heat generated in the system of the present invention, and includes the rotary kiln 200, the particulate gas discharge device 60, The purified air is not entirely discharged to the atmosphere while passing through the particle separator 70, and a part of the purified air is injected into the contaminated soil by using the discharged air injection pipe 90 and utilized.

That is, since the air discharged from the contaminated soil purification system of the present invention is discharged at a higher temperature than the air in the air, the waste heat of the air generated through the system of the present invention is used without heating and injecting additional air .

Therefore, as shown in FIG. 7, the exhaust air injection pipe 90 may be connected to the air injection wells 110 and 160 used in the soil vapor extraction method (SVE) 100, -Pile, air or oxygen can be injected into the contaminated soil or ground water at a predetermined temperature or higher.

Such an exhaust air injection pipe 90 may be a component relative to the soil exhaust gas inflow pipe 80, but may not necessarily be installed together, and may be independently installed and used according to the method of restoring and purifying contaminated soil. Of course.

Hereinafter, the effect of the method of recovering contaminated soil according to the present invention using waste heat generated in the system constituting the discharge air injection pipe 90 or the like will be described.

Generally, most of the conventional soil remediation method is a method of injecting air in the air, but the soil remediation method of the present invention reuses the waste heat generated in the treatment of contaminated soil to the restoration process of other soil or ground water, .

The expected effect of soil remediation by using waste heat is to increase microbial activity first. That is, in the biological treatment of contaminated soil, soil temperature plays an important role in microbial growth. Soil microbial activity decreases sharply below 10 ° C, and there is little activity below 5 ° C. Therefore, it is difficult to expect the biological restoration efficiency at the time when the soil temperature is lowered. However, as in the present invention, by supplying the warm air using the waste heat to the contaminated soil, the activity of the microorganism can be increased.

It is reported that the true logo and the optimal microbial activity temperature are about 30 ° C, and the biodegradability of contaminants by microorganisms increases by 2 times as the temperature increases by 10 ° C.

Next is Henry's Constant increase in pollutant. That is, the Henry's constant is a value indicating the equilibrium concentration distribution in the gas phase and the liquid phase of the substance, and the higher the value of the volatile substance is. It is known that the material with high Henry's constant value is easier to treat by the soil vapor extraction method (SVE), and the Henry's constant is greatly influenced by the temperature and it is known that it increases about 1.6 times at every 10 ° C increase in temperature .

Next, the air permeability in the contaminated soil increases. By heating the soil, the soil particles are broken and dried, thereby increasing the air permeability in the soil and increasing the efficiency of extracting contaminants to the outside while vaporizing the contaminants in the liquid state.

Next, by decreasing the viscosity of the substances in the contaminated soil and increasing the mobility, volatile gases, pollutants and the like can be extracted more effectively.

Hereinafter, the movement path of the soil and air in the embodiment of the present invention shown in FIG. 7 constructed as above will be described with reference to FIGS. 8 and 9. FIG.

FIG. 8 is a flowchart showing a contaminated soil conveyance path according to the present invention, and FIG. 9 is a flowchart showing a flow path of air including hot air according to the present invention.

First, referring to Fig. 8, the transport path of contaminated soil will be described. The deposited contaminated soil Sc is transported to the transporting hopper 1, the belt conveyor 3, the vibration screen 5, the flex belt conveyor 7, The preheating drier 10, the multi-stage rotary kiln 200, the screw conveyor 43, and the belt conveyor 45 to be cleaned.

9, the hot air and the decomposed exhaust gas are supplied to the burner 51 and the pressurized blower 52 of the hot air supply device 50, the multi-stage rotary kiln 200, the preheating The heat exchanger heater 63 of the particulate gas discharge device 60, the cyclone dust collector 71 of the particulate separation device 70, the bag filter 73, the artificial blower 74, the gas purifier 75, , And the discharge chimney (77).

Part of the gas that has passed through the gas purifier 75 is supplied to the contaminated soil, contaminated ground water, or soil contaminated soil deposited on the ground through the exhaust air injection pipe 90.

As described above, the present invention having the flow path of contaminated soil, the hot air and the gas is summarized as follows.

First, the present invention is characterized in that the contaminated soil is passed through the preheater 10 and the multi-stage rotary kiln 200, and the multi-stage rotary kiln 200 and the preheater dryer 10 are heated in a direction opposite to the traveling direction of the contaminated soil, So that the contaminated soil is purified.

In addition, hot air, pyrolysis gas and fine particles discharged through the preheater 10 are discharged to the particulate gas discharging device 60, and a part of the hot air is discharged to the inside of the rotary kiln 200 And circulates the same.

Next, according to the present invention, hot air is forcedly supplied to contaminated soil to be purified by using waste heat of relatively high temperature air discharged while passing through the particulate gas discharging device (60), and waste heat And the gas is introduced into the multi-stage rotary kiln (200) and used.

Next, the multi-stage rotary kiln 200 used in the modified embodiment of the present invention will be described with reference to FIGS. 10 and 11. FIG.

FIG. 10 is a detailed view showing a multi-stage rotary kiln according to the present invention, and FIG. 11 is a view showing a flow of hot air in the multi-stage rotary kiln shown in FIG.

The rotary kiln 200 according to the present embodiment is configured in a three-stage manner in a 24-ton low-bed trailer T, and a preheat dryer 10 is installed thereon. Of course, the present invention is not limited to this, and the rotary kiln 200 may be installed in two or more stages, or the preheat dryer 10 may be installed separately from the multi-stage rotary kiln 200 Preferably, the rotary kiln 200 is installed in three stages, and the preheating dryer 10 is installed in the upper portion of the rotary kiln 200, as illustrated in the drawing.

In the description of the multi-stage rotary kiln 200 according to the present invention, the basic structure of each rotary kiln 200 is the same as or similar to the structure described with reference to FIGS. 5 and 6, and a description thereof will be omitted .

The multi-stage rotary kiln 200 according to the present invention includes a plurality of rotary drums 211, 212, and 213 inclinedly arranged in a zigzag manner, support means for rotatably supporting the rotary drums 211, 212, and 213, And drum driving means for rotationally driving the rotary drums 211, 212 and 213, respectively.

5, a spiral conveyance unit 223 and a baffle (not shown) are formed in the rotary drums 211, 212, and 213, respectively.

Between the three rotary drums 211, 212, and 213, there are formed the connection conveying units 231, 232, and 233 that connect the drums to each other and guide the contaminated soil to the next drum.

The connection conveying units 231, 232 and 233 may be any structure capable of transmitting the contaminated soil discharged from the preheating dryer 10 and the upper rotary drum 212 or 213 to the lower rotary drum 211 or 212 However, it is preferable that the transfer device is configured by a natural fall transfer method by a height difference.

The connecting and receiving portions 231 and 232 are fixed to the frames 252 and 253, respectively, to be described later. At this time, the connection conveying parts 231, 232, and 233 are configured to support one end or both ends of the rotary drums 211, 212, and 213 while rotatably supporting them.

The connection conveying units 231, 232 and 233 are provided with hot air connecting lines 261, 262 and 263 so as to continuously circulate hot air between the rotary drums 211, 212 and 213 and the pre- And burners 51 for heating hot air may be installed in the inlet and outlet connection transfer parts 231, 232 and 233 of the rotary drums 211, 212 and 213, respectively.

The hot air connecting line 263 between the rotary drum 213 and the preheating dryer 10 is connected to a hot air supply line 263 for spraying hot air through the spray pipe 15a in the pre- 15c are branched, and a blowing fan 15d is provided on the blowing hot air supply line 15c.

The supporting means for supporting the multi-stage rotary drums 211, 212 and 213 are supported by the respective frames 251, 252 and 253 fixed to the trailer T. Although the frames 252 and 253 of the second and third stages are not shown in the drawings, they may be supported directly on the trailer T or connected to the first frame 251.

Since the frame 251, 252, 253 or the like can be easily supported by a person skilled in the art depending on the conditions of implementation, detailed description is omitted.

However, in the present invention, the frames 251, 252, and 253 are installed in a substantially horizontal direction, and the rotary drums 211, 212, and 213 provided thereon are disposed in an inclined direction.

A pair of support rollers 32 are provided at the upper portions of the frames 251, 252 and 253 and the support rollers 32 support the rotation rails 27 of the rotary drums 211, 212, And is rotatably supported.

The driving means for rotating the rotary drums 211, 212 and 213 includes a driving motor 34 provided in each of the frames 251, 252 and 253 and a driving gear 35 rotated by the driving motor 34 And a driven gear 28 mounted on each of the rotary drums 211, 212, and 213 and coupled to the driving gear 35 to receive power.

In the above description, the rotating drums 211, 212 and 213 are separately rotated. However, depending on the operating conditions, the rotating drums 211, 212, and 213 may be rotated by using one driving motor and a power transmitting mechanism, It is also possible to constitute such that it rotates.

The preheating dryer 10 is installed on the upper part of the multi-stage rotary kiln 200 configured as described above such that the preheating dryer 10 is horizontally positioned. The preheating dryer 10 also includes frames 251, 252, and 253 ) Supporting member or the like.

For reference, the preheater 10 shown in FIG. 10 has the same configuration as that of the preheater 10 of FIGS. 2 to 4C but differs from that of FIG.

The fine particle gas discharging device 60 may be installed immediately on the side of the gas discharge port 13b of the preheater 10 and a blowing fan 65 may be installed on the side thereof. The hot air circulation line 55 is connected to the burner 51 of the first rotary kiln 200 in the gas exhaust unit 60.

The multi-stage rotary kiln 200 as described above is preferably configured to be used in three stages, two stages, one stage or the like depending on the condition and kind of the contaminated soil and the purification condition of the contaminated soil. In this case, Or the three-stage rotary kiln 200 is desirably detachable from the one-stage or two-stage rotary kiln 200.

It is preferable that the attachment and detachment method is configured by a method of separating the frames 251, 252, and 253 of the respective rotary kilns 200.

On the other hand, FIG. 11 is a view showing a path through which the decomposition gas of the hot air and the contaminated soil moves, and the hot air and the decomposed gas flow opposite to the direction of transport of the contaminated soil.

As shown in the figure, the flow sequence of the hot air and the decomposition gas is controlled by the burner 51 of the first rotary kiln 200, the first rotary drum 211, the hot air connection line 261 between the first and second stages, The burner 51 of the kiln 200, the two-stage rotary drum 212, the hot air connection line 262 between the second and third stages, the burner 51 of the three-stage rotary kiln 200, The hot air connecting line 263 or the hot air supply line 15c and the spray pipe 15a between the three-stage rotary kiln 200 and the preheater dryer 10, the preheater dryer 10, 60, and then flows into the particulate separation device 70 and the hot air circulation line 55 in Fig. 7 separately.

12 is a system configuration diagram showing another modified embodiment of the contaminated soil purification system according to the present invention.

In another modified embodiment according to the present invention, the configuration of the novelty supply line 55A connected to the hot air supply device 50 is different from that of the embodiment of Fig. 7 described above.

That is, in the embodiment of FIG. 7 described above, the hot air circulation line 55 is configured to circulate and supply hot air in the middle of the gas discharge line 61 of the particulate gas discharge device 60. In the embodiment shown in FIG. 12, And a heat exchanger 63A is provided in the middle of the gas discharge line 61. The new external air is heat-exchanged through the heat exchanger to be heated and then supplied to the hot air supply device 50. [

Here, a fresh water supply line 55A is connected between the heat exchanger 63A and the hot air supply device 50. [

Therefore, when hot air is supplied to the rotary kiln 200, hot air can be rapidly supplied by heating the new air sucked into the hot air supply device 50 by using the heat discharged through the gas discharge line 61 Of course, it also has the effect of saving energy.

The other parts are similar to those of the embodiment described with reference to FIG. 7, and therefore, the same reference numerals are assigned to them, and a detailed description thereof will be omitted.

13 is a system configuration diagram showing yet another modified embodiment of the contaminated soil purification system according to the present invention.

In another modified embodiment according to the present invention, the structure is basically similar to that of the embodiment of FIG. 7 described above, but the structure for injecting fresh air that has been heat-exchanged into contaminated soil deposited on the ground, contaminated ground water, or underground contaminated soil is different .

That is, in the embodiment of FIG. 7 described above, the air discharged from the gas purifier 75 is supplied to the contaminated soil, contaminated ground water, or underground contaminated soil deposited on the ground through the discharge air inlet pipe 90 In this embodiment shown in FIG. 13, a heat exchanger 63B is provided in the middle of the gas discharge line 61, heat is generated by exchanging fresh air from outside through the heat exchanger, and then the contaminated soil Or contaminated groundwater or soil contaminated soil.

The heat exchanger (63B) and the deposited infiltrated soil, the contaminated ground water, and the contaminated soil are connected to a new infusion pipe (90B).

Therefore, by using the heat discharged through the gas discharge line 61 when supplying the hot air to each contaminated soil, the outside air newly injected through the fresh air injection tube 90B is heated, It is possible to restore the soil while efficiently injecting the heated air using the waste heat generated through the system.

The contaminated soil purification system and method according to the present invention constituted and operated as described above is characterized in that a rotary kiln capable of maximizing the thermal contact area with the contaminated soil is constituted by a preheater dryer capable of drying moisture in contaminated soil There is an advantage that the contaminated soil containing organic compounds such as petroleum can be purified and restored more effectively.

In addition, since the contaminated soil purification system and method according to the present invention are configured to purify the contaminated soil by reversing the traveling direction of the contaminated soil passing through the preheating dryer and the rotary kiln and the direction of the hot air, The efficiency of heat exchange can be improved, and the ability to decompose pollutants and the like from polluted soil can be improved, thereby enhancing the efficiency of purifying contaminated soil.

Also, the contaminated soil purification system and method according to the present invention have an advantage of improving not only the soil purification efficiency but also the energy efficiency, by circulating the hot air discharged from the preheating dryer and rotary kiln to purify the contaminated soil.

In addition, since the polluted soil purification system and method according to the present invention are constructed so that the extracted waste gas discharged from the contaminated soil deposited on the ground, the contaminated ground water, and the soil contaminated with pollution can be introduced into the rotary kiln, There is an advantage that waste gas and the like can be easily treated without necessity.

In addition, since the contaminated soil purification system and method according to the present invention is configured so that hot air purified and discharged from the system according to the present invention can be supplied to contaminated soil, contaminated ground water, and soil contaminated soil deposited on the ground, There is an advantage that the contaminated soil in the ground or the ground can be more efficiently purified and restored in a single soil restoration system without using a heating device.

Also, the contaminated soil purification system and method according to the present invention can be applied to soil pollutants such as soil SVE, bio-venting, bio sparging or air sparging Since it is configured for use with a contaminated soil remediation system and method, there is an advantage that the contaminated soil can be effectively restored and treated in various ways.

Next, the pre-drying dryer of the contaminated soil purification system according to the present invention is configured to preheat and dry the contaminated soil flowing into the rotary kiln, which has an advantage of contributing to enhance soil purification efficiency.

In addition, since the preheating dryer of the contaminated soil purification system according to the present invention allows the hot air to pass through the casing and the hot air blowing mechanism is additionally provided, the heat exchange ability between the hot air and the contaminated soil is improved, There is an advantage that the drying efficiency can be further increased.

The rotary kiln of the contaminated soil purification system according to the present invention maximizes the contact between the contaminated soil and the hot air because the spiral transfer part and the plurality of baffles are formed inside the rotary drum, Thereby providing an advantage of increasing the efficiency.

Further, since the rotary kiln of the contaminated soil purification system according to the present invention is configured to remove contaminants by a method of drying and decomposing contaminants in a rotary drum without burning, it is easy to treat contaminants, So that the purification efficiency of the soil can be increased.

In addition, the rotary kiln of the contaminated soil purification system according to the present invention, when constructed in a multi-stage continuous structure, can effectively control the time, space, and temperature control necessary for purification according to the condition of the contaminated soil, Thereby providing an advantage that the processing efficiency can be further improved.

Further, in the rotary kiln of the contaminated soil purification system according to the present invention, when the rotary kiln is configured to be detachably attached to each rotary kiln in a multi-stage continuous structure, the number of rotary kilns can be easily adjusted according to the use conditions, When installed and configured, it has the advantage of being easier to store and move, and more convenient to use with other purification systems.

Claims (21)

A preheating dryer for preheating the contaminated soil fed into the inside by hot air while being disturbed by a screw device; A rotary kiln for purifying contaminated soil introduced into the rotary drum through heating and decomposing after passing through the preheating dryer; A purified soil treatment device connected to an end of the rotary kiln to discharge and treat the purified soil; A hot air supply device for supplying hot air into the rotary kiln and the preheating dryer in a direction opposite to the conveying direction of the contaminated soil; A particulate gas discharge device connected to the contaminated soil inlet of the preheater to discharge the pyrolysis gas and the fine particles together with the hot air; And a particulate separation device connected to the particulate gas discharge device for separating and processing the fine particles of the soil and the gas. The method according to claim 1, Wherein the rotary kiln is configured such that a plurality of rotary drums are interconnected in a multi-stage manner. The method according to claim 1, Wherein the rotary kiln is mounted on a trailer to be movable. The method according to claim 1, Wherein the rotary kiln is connected to a soil exhaust gas inflow pipe so that contaminated soil deposited on the ground, contaminated ground water, and extracted waste gas discharged from the soil contaminated soil can be treated and treated. The method according to claim 1, The hot air supply device is connected to the rotary kiln after branched from the middle of the particulate gas discharge device to circulate and supply hot air, and a burner and a blower for providing hot air on a path through which the hot air is circulated Features contaminated soil purification system. The method according to claim 1,  Wherein the particulate separation device further comprises a gas purifying device for purifying the separated gas, Further comprising an exhaust air inflow pipe for supplying the air discharged from the gas purifier to contaminated soil deposited on the ground, contaminated ground water, or soil contaminated with soil. The method according to claim 1, Wherein the hot air supply device is connected to a fresh air supply line so that external air is heat-exchanged with gas discharged through the particulate gas discharge device, heated and then introduced. The method according to claim 1, The contaminated soil remediation system further includes a fresh air inlet pipe for supplying external air into the contaminated soil, contaminated ground water, and underground contaminated soil deposited on the ground after heat exchange with the gas discharged through the particulate gas discharge device and heating Wherein the contaminated soil purification system comprises: A method for purifying contaminated soil using the system of any one of claims 1 to 8, A soil supplying step of passing contaminated soil to be purified into the preheater dryer and the rotary kiln; And a hot air supplying step of supplying hot air to the rotary kiln and the preheating dryer in a direction opposite to the traveling direction of the contaminated soil to purify the contaminated soil. The method of claim 9, Wherein the hot air is supplied to the preheat dryer after passing through the rotary kiln in the hot air supply step. The method of claim 10, Wherein a part of the hot air flowing into the preheat dryer after passing through the rotary kiln is concentratedly sprayed into the preheater dryer using a separate spray line and a blower. The method of claim 9, And discharging hot air, pyrolysis gas and fine particle soil discharged through the hot air supply step to the particulate gas discharge device, and supplying part of the hot air to the inside of the rotary kiln again Contaminated soil. The method of claim 9, Forcibly supplying hot air to contaminated soil to be purified; The method of claim 1, further comprising the step of injecting waste gas and pollutants discharged through the step into the rotary kiln. 14. The method of claim 13, Wherein the hot air used in the step of forcibly supplying hot air to the contaminated soil to be purified uses air discharged while passing through the fine particle gas discharging device. A casing having a long channel-like structure and provided with inlet and outlet ports for contaminated soil on both sides; A soil conveying mechanism provided in the casing for moving the contaminated soil introduced through the inlet to the outlet; Hot air supply means for supplying heated air in a direction opposite to the traveling direction of the contaminated soil so that the contaminated soil passing through the casing can be dried; And a hot air blowing means provided in the casing separately from the hot air supplying means and provided with a plurality of nozzles to supply hot air to the soil passing through the casing while forcibly spraying the hot air. 16. The method of claim 15, Wherein the soil conveying mechanism comprises a pair of screws installed side by side in the casing and rotating in mutually facing directions, and driving means for driving the pair of screws. 16. The method of claim 15, Wherein the hot air jetting means comprises a jet pipe extending along the longitudinal direction of the casing and a plurality of nozzles provided in the jet pipe. A rotary drum having an inlet through which contaminated soil is introduced into one side and an outlet through which contaminated soil is discharged to the other side, Supporting means for rotatably supporting the rotary drum; And a drum driving means provided in the supporting means for rotationally driving the rotary drum, A spiral conveying unit formed in the spiral conveying unit to convey the contaminated soil to the inside of the rotary drum and configured to convey the contaminated soil to the inside of the rotary drum, and a baffle having a plurality of spiral conveying units disposed thereon to disturb the contaminated soil, And the rotary kiln of the contaminated soil purification system. 19. The method of claim 18, A plurality of rotary drums are arranged in a multi-stage structure in a zigzag manner, Characterized in that a plurality of rotary drums are provided with a connection conveying portion for interconnecting the drums to guide the contaminated soil to the next drum. The method of claim 19, Wherein each of the rotary drums is installed in each frame, Wherein the drum driving means is installed separately in each of the frames. 19. The method of claim 18, Wherein the baffle is formed in a long plate structure and is long in the longitudinal direction of the rotary drum and the end of the baffle is inclined upward at a predetermined angle in the rotating direction of the drum.

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