KR101929272B1 - Remediation of complex contaminated soils - Google Patents

Abstract

A complex contaminated soil remediation system according to one aspect of the present invention is provided, in which a single system is constituted to open a valve if necessary to transfer heavy metal contaminated soil to a pickling tank to perform treatment, and to close the valve if the pickling is not necessary in accordance with the contaminated soil condition to omit the pickling process and perform remediation of the contaminated soil with water only. The complex contaminated soil remediation system comprises: a feeding device; a washing and sorting device; an advanced sorting device; and a pickling device.

Description

{REMEDIATION OF COMPLEX CONTAMINATED SOILS}

More particularly, the present invention relates to a system for collecting contaminated soil, more specifically, a single system constituting a system for transporting heavy metal contaminated soil to a pickling bath by opening a valve if necessary, And to purify soil contaminated only with water by omitting the pickling process by closing the valve when the soil is not present.

In general, environmental pollution can be classified into air pollution, water pollution, and soil pollution. Among them, soil pollution poses a serious threat to food production, and also pollutes the groundwater as well as groundwater pollution. Contaminated soil needs to be cleaned up early.

In recent years, soil pollution in Korea is mainly caused by unauthorized landfill or leakage of liquid wastes. In addition, it is caused by the underground diffusion of ground - level objects left in the course of long - term industrial activities. It is caused by various kinds of chemical species rather than single species compounds. Representative complex pollution occurs in most industrial activity areas in the form of oil and heavy metals.

Methods for recovering contaminated soil can be classified into physical methods such as soil washing, incineration, solidification, stabilization and solvent extraction, and biological methods such as soil cultivation, composting, bio-venting, and plant restoration. Among these methods, it is relatively easy to recover soil contaminated easily and is a soil washing method.

The contaminated soil washing method is a technique of using a proper detergent to weaken the surface tension of the harmful organic pollutants bonded to the soil particles or to separate them from the soil particles by changing the heavy metal to liquid, And can be applied regardless of the kind of the pollutant.

The soil washing method is divided into an in-situ method and an ex-situ method. In-situ method is a method to remove contaminated soil without washing solution injecting solution, washing solution discharging solution, washing effluent treating solution, (Soil Flushing), which is a soil flushing method in which volatile substance treatment facilities are installed on contaminated sites and the contaminated soil is directly circulated by circulating the cleaning agent in the contaminated soil to be treated. As a result, the treatment time is long, Because there are no disadvantages, the soil washing method is mainly applied to the Ex-situ method.

The Ex-situ method is used to determine the distribution of pollutants in the soil and the physical / chemical characteristics of the soil, excavate the contaminated soil to be treated, and then use the appropriate detergent to remove the contaminated soil As a method of washing, it is used as a recently generalized soil washing method.

Conventional soil washing methods are used to select and wash the contaminated soil in multiple steps to remove various contaminants including oil and heavy metals attached to the contaminated soil, thereby restoring the soil. Korean Patent No. 10-0534067 (Restoration of Contaminated Soil And a soil washing method and apparatus for sorting were proposed.

In the prior art, the contaminated soil is sorted through a dry sorting step and a high pressure spraying step, and then washed in a primary washing tank and simultaneously discharged and discharged into a flooded soil containing a large amount of contaminants and immersed soil containing a small amount of contaminants , The separated soil is washed and separated into fine soil and granular soil simultaneously with washing in the secondary washing tank, and the granular soil is dehydrated and reduced to the restoration soil. The fine soil is precipitated, flocculated and dehydrated together with the suspended soil discharged from the primary washing tank It is a technology to make waste sludge by the process and neutralize and clean the polluted cleaner.

Such conventional prior arts are characterized in that after the soil particles having a large particle size are selected in the dry separator and the high pressure spraying separator, the cleaning process is performed in the primary and secondary washing tanks, and then the fine soil and floating soil generated in the washing process are discarded So that the second environmental pollution is caused by waste. In particular, pollutants adsorbed on the particulate soil can not be effectively removed.

In addition, when the metal component is strongly bonded to the soil particles only by the conventional soil washing technique, if the density and surface characteristics of the metal-containing soil and the non-containing soil are not clearly distinguished, If the technique is difficult to apply, if the heavy metals are combined with soil particles of various sizes, or if the silt / clay content exceeds 30-50% or the soil with high humic content, There is a problem that it is difficult to effectively remove contaminants adsorbed on the soil.

Particularly, in the conventional soil cleaning technology, when the soil to be applied contains a large amount of micro-soil, the purification efficiency is low. This is due to the characteristic of the micro-soil in which the specific surface area is high and the adsorption site is abundant, It is difficult to desorb the oil and the inorganic contaminants through the purification method because the contaminants are more strongly adsorbed.

In addition, in the case of purifying soil contaminated with heavy metals, acid pickling using a large amount of acid was mainly applied so far, which is disadvantageous in terms of economy, environment friendliness, workability and safety.

One aspect of the present invention is to provide a complex contaminated soil purification system capable of simultaneously treating soil contaminated with oil and heavy metals.

In another aspect of the present invention, a single system is constituted to open a valve if necessary to transfer heavy metal contaminated soil to a pickling bath and treat it. When the pickling is not necessary depending on the condition of the contaminated soil, And to purify soil contaminated only with water by omitting the soil.

Another aspect of the present invention is to provide a complex contaminated soil purification system including an advanced water treatment apparatus so that the treated water generated in the purification process of the contaminated soil can be reused.

A contaminated soil purification system according to an embodiment of the present invention includes a feeding device having a feed hopper and a feed conveyor for feeding contaminated soil, and a feeding device for feeding the contaminated soil, which has been put in order to clean the contaminated soil supplied from the feeding device, A mix washer for spraying and washing the washing water while conveying the mixed soil, and a wet vibration discriminator for collecting the contaminated soil washed out from the mix washer, And a washing and sorting device including a washing and sorting device for wet and granular separation of the soil introduced from the washing and sorting device to discharge particles smaller than the first reference particle size to the first outlet port and particles larger than the first reference particle size to the first A first hydrocyclone discharged from the first discharge port of the first hydrocyclone, A cleaning clean sand dewatering system for dehydrating water from particles larger than the particle size to produce washing sand, and a wet granulation separation for moisture from the washing clean sand dehydration system to remove particles smaller than the second reference size into the outlet 2a And a second hydrocyclone for discharging particles larger than the second reference particle size to the second outlet, a pickling tank for selectively transporting the contaminated soil through the height separating device, And a pickling select valve connected to the second outlet of the second hydrocyclone for selectively connecting the wash tank.

The pickling apparatus further comprises a pickling tank for picking up and pickling heavy metals from the fine soil supplied from the second bout outlet of the second hydrocyclone and for picking up fine soil discharged from the second hydrocycloe by the pickling tank An acid pickling agent supply tank for supplying an acid pickling agent to the pickling tank and a first opening and closing valve for controlling the supply amount of pickling agent supplied to the pickling vessel in the pickling agent supply tank .

The pickling select valve may further comprise a first pickling select valve disposed between the second hydrocyclone and the pickling bath and disposed adjacent to the second hydrocyclone side and a second pickling select valve disposed between the second hydrocyclone and the pickling clean sand dehydrating system A third pickling select valve disposed between the second hydrocyclone and the pickling bath and disposed adjacent to either of the pickling baths and a second pickling selector valve disposed between the second hydrocyclone and the pickling bath, And a fourth pickling select valve disposed adjacent to the other of the pickling baths.

The acid pickling apparatus includes a neutralization tank for neutralizing the micro-soil picked up in the pickling tank, a neutralization agent supply tank for supplying the neutralization agent to neutralize the acid treatment agent, and a neutralizer And a second on-off valve for controlling the supply amount of the second open / close valve.

The apparatus also includes an elevation water treatment device connected to the first and second hard cyclones, wherein the elevation water treatment device is connected to the i < th > outlet of the first hydrocyclone and the & A sedimentation tank connected to the sedimentation tank to receive fine sediments not precipitated in the sedimentation tank and allowed to settle to the bottom using a flocculant; And a condensing tank connected to the discharge end of the settling tank for storing the sludge discharged to the settling tank and the settling tank and generating concentrated sludge separated by gravity; and a concentrated sludge discharged from the concentrating tank is introduced to discharge the concentrated sludge into a dehydrated cake And a dewatering device for generating a dewatering agent.

The advanced water treatment apparatus includes a pressurized floating tank for supplying water discharged from a settling tank and water discharged from a dewatering device to forcefully float the oil contained in the water through bubble generation; And an oil-water separation system for separating the oil contained in the bubbles from the oil.

In addition, the advanced water treatment apparatus includes: a process water reservoir for receiving water separated from the pressurized floatation tank and supplying water to the mix washer, the wet vibration discriminator, and the clean sand dehydration system; And a replenishment water storage tank that replenishes water as much as possible.

According to another aspect of the present invention, there is provided a system for collecting contaminated soil, comprising: a feeding device having a feed hopper and a feed conveyor for feeding contaminated soil; Mix washer which is sprayed with washing water while conveying the soil by axial rotation method, and mixed soot which is washed in the mix washer, and the soil of a certain particle size or more is discharged to the outside, and the aggregate is produced and discharged. Wetting and sorting the soil introduced from the washing and sorting device to discharge particles smaller than the first reference particle size to the first outlet and to be larger than the first reference particle size A first hydrocyclone for discharging the particles to the first b outlet, and a first b discharge of the first hydrocyclone A washing clean sand dewatering system for dehydrating water from particles larger than a first reference particle size discharged from the washing clean sand dewatering system to produce washing sand; And a second hydrocyclone for discharging particles larger than the second reference particle size to the second discharge port and discharging particles larger than the second reference particle size to the second discharge port; An acid pickling selector valve for allowing fine pickling of fine soil discharged from the second hydrocyclone to be selectively transferred to the pickling tank, an acid pickling agent supply vessel for supplying an acid pickling agent to the pickling vessel, An acid generator which includes an on / off valve for regulating the supply amount of the pickling agent supplied to the pickling tank from the treatment agent supply tank A sedimentation tank connected to the first a discharge port of the first hydrocyclone and the second discharge port of the second hydrocyclone to receive the fine tess through the first and second hydrocyclones to cause the fine tessellation to be gravity settled to the bottom, A sedimentation tank connected to the settling tank for receiving fine sediment that has not been settled in the settling tank and allowing it to settle to the bottom using a flocculant; and a sludge tank connected to the discharge end of the settling tank and the settling tank for storing the sludge discharged to the settling tank and the settling tank, And a dewatering device including a dewatering device for producing concentrated sludge and a dewatering device for introducing the concentrated sludge discharged from the concentrating tank to produce water to produce concentrated sludge as a dewatering cake.

Therefore, the complex contaminated soil purification system according to the embodiment of the present invention has the effect of enabling the simultaneous treatment of soil contaminated with oil and heavy metals.

In addition, the complex contaminated soil purifying system according to the embodiment of the present invention constitutes a single system, and when necessary, the valve is opened to transport the heavy metal contaminated soil to the pickling bath, and it is necessary to carry out pickling according to the state of the contaminated soil It is possible to close the valve to omit the pickling process and purify the contaminated soil only with water.

In addition, the complex contaminated soil purifying system according to the embodiment of the present invention has an effect of allowing the treated water generated during the purification process of the contaminated soil including the advanced water treatment apparatus to be reused.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a complex contaminated soil purification system according to an embodiment of the present invention; FIG.
FIG. 2 is an enlarged view of a front end portion of the composite contaminated soil purification system shown in FIG. 1. FIG.
3 is an enlarged view of the pickling apparatus shown in Fig.
FIG. 4 is an enlarged view of the interruption part of the composite contaminated soil purification system shown in FIG. 1; FIG.
FIG. 5 is an enlarged view of the rear end of the complex contaminated soil purification system shown in FIG. 1; FIG.

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

FIG. 1 is a schematic view showing a complex contaminated soil purification system according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a front end of the complex contaminated soil purification system shown in FIG.

1 and 2, a complex contaminated soil purification system 10 according to an embodiment of the present invention includes a feeding hopper 110 and a feeding conveyor 120, A mix washer 210 for spraying and washing the washing water while conveying the contaminated soil so fed in order to clean the contaminated soil supplied from the feeding device, A washing and sorting apparatus 200 including a wet type vibration separator 220 for receiving soil of a predetermined particle size or more and for producing and discharging washed aggregates to the outside and discharging soil having a particle size smaller than a predetermined particle size, The first hydrodynamic bearing 314 discharges the particles smaller than the first reference particle size to the first discharge port 314 and discharges the particles larger than the first reference particle size to the first b discharge port 315, A cleaning clean sand dewatering system 320 for dehydrating water from the particles of the first reference particle size or more discharged from the first bout 315 of the first hydrocyclone 310 to produce washing sand, The particles passing through the clean sand dewatering system 320 are subjected to wet-type particle separation to discharge particles having a particle size smaller than the second reference particle size to the second outlet port 334 and particles having a particle size larger than the second reference particle size to the second outlet port 335 A pickling apparatus 410 for selectively transporting the contaminated soil through the height separating apparatus 300, an altitude sorting apparatus 300, And a pickling apparatus 400 having pickling select valves 431 to 434 connected to the second boutlets 335 of the second hydrocyclones 330 so as to selectively connect the pickling vessels 410 and 420 .

The feeding device 100 is for feeding the soil mixed with the contaminants into the washing and sorting device 200 in a predetermined amount. The feeding device 100 includes a feed hopper 110 into which the contaminated soil is fed, And an input conveyor 120 disposed at the side of the hopper 110 for quantitatively conveying the contaminated soil to the washing and sorting apparatus 200.

That is, the contaminated soil supplied to the input hopper 110 is supplied to the cleaning and sorting apparatus 200 through the input conveyor 120.

At this time, the polluted soil does not distinguish its characteristics, but the pollution degree can be determined and the time can be determined according to the pollution degree in the post-process.

The contaminated soil put into the washing and sorting apparatus 200 through the feeding device 100 is sorted according to desorption and particle size of oil and heavy metals in the washing and sorting apparatus 200. In the washing and sorting apparatus 200, (2mm ~ 40mm) are selected to produce washed aggregate, and only the particles (2mm ~ 40mm, 40mm are not included) of less than a certain particle size are passed through the subsequent process.

Specifically, the feeding device 100 is connected to a washing and sorting device 200 for performing a process of separating oil and heavy metals from the soil and increasing the efficiency of the purification process.

The washing and sorting apparatus 200 includes a mix washer 210 for spraying and washing the washing water while conveying the contaminated soil so as to rotate the contaminated soil to wash the contaminated soil supplied from the feeding device 100, And a wet vibration discriminator 220 that receives the cleaned contaminated soil and generates and removes the washed aggregate from the soil of a predetermined particle size or more and discharges the soil of less than a predetermined particle size.

Specifically, the soil introduced through the input conveyor 120 connected to the lower end of the feed hopper 110 is mixed with the washing water in the mix washer 210.

The mix washer 210 is a paddle type, and a plurality of paddles 212 are attached to one rotating shaft 211.

The washing water is sprayed through the spray nozzles 213 installed on the mix washer 210.

Accordingly, when the rotary shaft 211 rotates and the soil is transferred by the paddle 212, the washing water is sprayed from the spray nozzles 213 and mixed to wash the soil.

The mix washer 210 can control the throughput of the contaminated soil by adjusting the rotational speed of the rotating shaft 211.

The supplied wash water is supplied from the process water storage tank 1100 as described later. The size of the mix washer 210 is 4.56 m in length, 0.66 m in width, and 0.72 m in height, 15 horsepower can be used.

The soil washed from the mix washer 210 is introduced into the wet vibration discriminator 220, and the soil is separated and sorted on the basis of the size of a predetermined particle size to generate and remove the washed aggregate having a size of 2 mm to 40 mm.

That is, the wet vibration discriminator 220 receives the soil slurry discharged from the mix washer 210, selects particles having a predetermined particle size or more, and passes only fine particles having a particle size smaller than a predetermined particle size to carry out a subsequent process.

Specifically, the wet vibration discriminator 220 includes a first screening net 221 for sorting contaminated soil of a first size or larger in contaminated soil to efficiently perform the first wet vibration screening, And a second screening network 222 installed at a lower portion of the first screening network 221 to have a second size that is relatively smaller than the first size, 220 are sorted through the conveyor belt 230 to produce washed aggregates having a size of 2 mm to 40 mm.

Sediments of less than a certain size through the washing and sorting device 200 are fed to the altimeter sorter 300 via the pump 240 and then highly sorted.

The height sorting apparatus 300 performs wet sorting on the soil introduced from the washing and sorting apparatus 200 to discharge particles having a particle size smaller than the first reference particle size to the first outlet port 314, The first hydrocyclone 310 discharges particles from the particles of the first reference particle size or more discharged from the first bout 315 of the first hydrocyclone 310, The washing clean sand dewatering system 320 for generating sand and the washing clean sand dewatering system 320 are wetly subjected to particle size separation so that particles having a particle size smaller than the second reference particle size are discharged to the second outlet port 334 And a second hydrocyclone 330 for discharging particles having a second reference particle size or more to the second outlet 335.

The first hydrocyclone 310 performs wet-type particle separation on the basis of a first reference particle size. The first hydrocyclone 310 has a hollow conical first tapered portion 311 and a first nozzle portion 312, a first inlet 313 for entering the cylindrical tangential direction, an 1a outlet 314 connected to a wide inlet side of the first tapered portion 311, a first nozzle portion 312, And a first bout 315 connected to the first bout 315.

That is, water and contaminated soil are introduced into the first inlet 313, and a large vortex and a small vortex and a vertical flow passing through them in the axial direction are generated in the first tapered portion 311 by the vortex phenomenon and the centrifugal force.

At this time, the difference in centrifugal force occurs due to the difference in weight of the particles, thereby separating the particles having the particle size larger than the first reference particle size and the particles having the particle size smaller than the first reference particle size.

In other words, particles and water having a particle size smaller than the first reference particle size are discharged through the first outlet port 314, and particles having a particle size larger than the first reference particle size are discharged through the first outlet port 315, It is possible to separate the gravel-like material based on the desired particle size by adjusting the length and the entrance area ratio of both ends.

Particles and water of less than the first reference particle size discharged through the first discharge port 314 of the first hydrocyclone 310 are supplied to the later-described advanced water treatment apparatuses 500 to 1000 and discharged through the first bout outlet 315 The discharged particles of the first reference particle size or more are supplied to the cleaning clean sand dewatering system (320).

The cleaning clean sand dewatering system 320 dehydrates water from the larger particles having a particle size greater than or equal to the first reference particle size selected at the first bout 315 of the first hydrocyclone 310 and passes through the conveyor belt 340 The cleaning sand having a size of 0.075 mm to 2 mm is generated or removed, or the remaining particles other than the cleaning sand are supplied to the second hydrocyclone 330 through the pump 350 so that the post-processing can proceed.

The second hydrocyclone 330 performs wet particle separation to discharge particles below the second reference particle size to the 2a outlet 334 and particles above the second reference particle size to the second b outlet 335, This second hydrocyclone 330 has the same configuration as the first hydrocyclone 310 and performs wet separation of the granules based on the second reference granularity, A second input port 333 formed of a conical second tapered portion 331 and a second nozzle portion 332 and entering in a tangential direction of the cylindrical shape and a second input port 333 connected to the wide entrance side of the second tapered portion 331 A second discharge port 334 and a second discharge port 335 connected to the second nozzle portion 332.

Particles less than the second reference particle size discharged to the second discharge port of the second hydrocyclone 330 are supplied to the advanced water treatment apparatus 500 to 1000 and particles having the second reference particle size or more discharged to the second b discharge port 335 The pickling / dehydrating process can be carried out again by the pickling apparatus 400 or the clean sand-dewatering system 320 depending on the opening / closing states of the pickling select valves 431 to 434.

Next, a pickling apparatus according to an embodiment of the present invention will be described. 3 is an enlarged view of the pickling apparatus shown in Fig.

As shown in FIGS. 1 and 3, the pickling apparatus 400 according to the embodiment of the present invention includes pickling baths 410 and 420 for pickling up and pickling heavy metals from fine soil of the second hydrocyclone 330, Acid pickling select valves 431 to 434 for selectively feeding the fine soil discharged from the second hydrocyclone 330 to the pickling tanks 410 and 420 and an acid pickling agent for supplying an acid pickling agent to the pickling tanks 410 and 420, A first open / close valve 451, 452 for controlling the supply amount of the pickling agent supplied to the pickling baths 410, 420 from the pickling agent supply tank 440, A neutralizing agent supply tank 460 for supplying a neutralizing agent for neutralizing the acid treatment agent to the neutralization tank 450 and a neutralizing agent supply tank 460 for supplying neutralizing agent to the neutralization tank 450 in the neutralizing agent supply tank 460, And a second on-off valve for controlling the supply amount of the neutralizing agent It can be generated.

The acid pickling tanks 410 and 420 are provided with at least two or more pickling tanks 410 and 420 to pick up the fine gravel having a second reference particle size or more. The washing water supplied from the untreated washing water supply tank may be supplied to the fine soil as well as the second reference particle size discharged from the second bout 335 of the hydrocyclone 330.

For this purpose, the pickling baths 410 and 420 are connected to the second hydrocyclone 330 through the pickling select valves 431 to 434.

The pickling select valves 431 to 434 include a first pickling select valve 431 disposed between the second hydrocyclone 330 and the pickling baths 410 and 420 and adjacent to the second hydrocyclone 330 side, A second pickling select valve 432 disposed between the second hydrocyclone 330 and the cleaning clean sand dewatering system 320 and a second pickling select valve 432 disposed between the second hydrocyclone 330 and the first pickling bath 410 A third pickling select valve 433 disposed adjacent to the first pickling bath 410 and a second pickling select valve 433 disposed between the second hydrocyclone 330 and the second pickling bath 420, And a fourth pickling select valve 434 disposed adjacent to the fourth pickling select valve 434.

Therefore, the complex contaminated soil purification system 10 according to the embodiment of the present invention is configured such that the first pickling select valve 431, the third pickling select valve 433, and the fourth pickling select valve 434 are opened The first pickling select valve 431, the third pickling select valve 433, and the fourth pickling select valve 432 can be closed by shutting down the second pickling select valve 432, Closing the pickling select valve 434 and opening the second pickling select valve 432 allows the pickling process to be omitted for heavy metal contaminated soils and to purify the contaminated soil only with water, So that contaminated soil can be purified by different mechanisms.

If necessary, only one of the third pickling select valve 433 and the fourth pickling select valve 434 may be selectively opened so that only one of the first pickling bath 410 and the second pickling bath 420 So that pickling of heavy metal contaminated soil can be carried out.

The acid treatment agent may be mixed with the wash water supplied to the first and second acid wash tanks 410 and 420 and the acid treatment agent mixed with the wash water supplied to the first and second acid wash tanks 410 and 420 may be mixed with the acid treatment agent 440).

The amount of the acid treating agent to be mixed into the washing water can be adjusted by the first opening / closing valves 451 and 452 provided between the first and second pickling tanks 410 and 420 and the acid treating agent supplying tank 440.

The first and second pickling tanks 410 and 420 may be made of a material having high corrosion resistance, for example, stainless steel to prevent corrosion by the acid treatment agent.

The fine soil and wastewater discharged from the first and second pickling tanks 410 and 420 are supplied to the neutralization tank 450 by a pump 451.

The fine soil and wastewater supplied to the neutralization tank 450 may be washed using wash water mixed with a neutralizing agent.

Neutralizing agent neutralizes the acid treating agent supplied from the first and second pickling tanks 410 and 420, thereby preventing the facilities from eroding in the processes after the first and second pickling tanks 410 and 420.

The neutralizing agent to be mixed with the washing water supplied to the neutralizing tank 450 may be supplied from the neutralizing agent supplying tank 460 through the pump 461.

Here, the supply amount of the neutralizing agent to be mixed into the washing water can be controlled by the second opening / closing valve (not shown) provided between the neutralizing tank 450 and the neutralizing agent supplying tank 460.

The neutralization tank 450 may be made of a material having high corrosion resistance, for example, stainless steel to prevent corrosion by the acid treatment agent.

The fine soil that has passed through the neutralization tank 450 is again supplied to the cleaning clean sand dewatering system 320 so that the dewatering process can be performed again.

Accordingly, the complex contaminated soil purification system 10 according to the embodiment of the present invention may constitute a single system, and if necessary, open only the first, third and fourth pickling select valves 431, 433, 434 to remove heavy metal contaminated soil 1 and the second pickling tanks 410 and 420. If no pickling is required depending on the state of the contaminated soil, only the second pickling select valve 432 is opened to omit the pickling process, To be purified.

Next, an advanced water treatment system of a complex contaminated soil purification system according to an embodiment of the present invention will be described. FIG. 4 is an enlarged view of the interruption part of the composite contaminated soil purification system shown in FIG. 1; FIG.

As shown in FIGS. 1 and 4, the advanced water treatment apparatus 500 to 1000 of the complex contaminated soil purification system according to the embodiment of the present invention includes the first outlet port 314 of the first hydrocyclone 310, 2 sedimentation tank 500 connected to the 2a discharge port 334 of the hydrocyclone 330 to receive the fine gravel through the gravel screening device 300 to cause the fine gravel to be gravity settled to the bottom while discharging the supernatant, A sedimentation tank 600 connected to the sludge sedimentation tank 500 for sedimenting the fine sludge which has not been sedimented to the bottom using a coagulant and discharging the supernatant and a sedimentation tank 600 connected to the sedimentation tank 500 and the sedimentation tank 600, A condensing tank 700 for storing the sludge discharged from the sedimentation tank 500 and the sedimentation tank 600 and generating concentrated sludge separated by gravity, and a concentrated sludge discharged from the concentration tank 700. The condensed sludge is discharged into the dehydrated cake To generate It can be configured to include a device (800).

The fine soil and the washing water having the first and second reference particle sizes less than the reference particle size passing through the first and second hydrocyclones 310 and 330 stay in the settling tank 500 for about 5 to 10 minutes and the fine soil is separated from the washing water by gravity settling.

Therefore, the fine soil as settled in the lower part of the settling tank 500 is supplied to the thickening tank 700, and the remaining undiluted very fine soil and the upper level water are supplied to the settling tank 600.

The extremely fine soil and washing water supplied to the settling tank 600 are flocculated and settled by adding flocculant to the settling tank 600. The settled very fine soil is supplied to the dehydrating apparatus 800 through the thickening tank 700 And the contaminated water is supplied to the pressurized floating tank 900 to be reused as washing water.

At this time, the flocculant is supplied through the flocculant supply tank 610, and the flocculant supplied through the flocculant supply tank 610 is mixed with the washing water in the flocculant stirring tank 620 and is introduced into the settling tank 600.

The coagulant is an inorganic electrolyte or an organic polymer compound which precipitates solid particles suspended in a liquid.

On the other hand, a scum removing device 510 for removing the scum discharged from the settling tank 500 is connected to the settling tank 500.

The scum removing device 510 fills the wastewater from which the suspended solids are separated in the settling tank 500 and injects air to remove fine suspended solids and oil, etc. floating on the top.

The high pressure pump system 520 is provided at the discharge end of the settling tank 500 to swell and break the excess sludge settled on the bottom of the settling tank 500 and to be supplied to the concentration tank 700 by the sludge transfer pump 520 Allow sludge to be transported smoothly.

The thickener 700 concentrates the fine soil supplied from the settling tank 500 and the settling tank 600 and is conveyed to the dehydrating apparatus 800. This dehydrating apparatus 800 dehydrates the concentrated fine soil to form a dehydrated cake The fresh water discharged in the dewatering process is transferred to the pressurized floating tank 900, and the dewatering cake can be transferred to a separate dewatering cake processing facility.

FIG. 5 is an enlarged view of the rear end of the complex contaminated soil purification system shown in FIG. 1; FIG.

As shown in FIGS. 1 and 5, the advanced water treatment apparatus 500 to 1000 according to the embodiment of the present invention is a system in which the oil contained in the supernatant is discharged through the bubbles to the supernatant discharged from the sedimentation tank 600, And a water separation system 1000 for separating the oil contained in the bubbles into the bubbles to be introduced from the pressurized floating tank 900. [

The pressurized floating tank 900 includes a reservoir 910 having a plurality of cells filled with water discharged from the sedimentation tank 600 and water discharged from the dewatering device 800 to a certain level, A pressurizing tank 920 for generating bubbles in which water and air are mixed so as to allow the oil to float in the process water and a discharge unit 930 for discharging the bubbles provided at the upper side of the water storage tank 910 to the outside do.

The water storage tank 910 has a plurality of cells. On both sides of the plurality of cells, a supply pipe 911 through which the process water is supplied and a drain pipe 912 through which the process water is drained are provided.

The water tank 910 is provided with a pressurizing tank 920 for generating bubbles in the process water. The pressurization tank 920 is capable of discharging the oil-added bubbles in the process water, .

The discharge unit 930 may be configured to include a bubble outlet 931 for discharging the bubbles scraped by the skimmer which scatters the floating bubbles while rotating at the upper side of the water reservoir 910.

A water separation system 1000 for separating oil and water from the bubbles discharged from the discharge unit 930 is provided.

The oil separation system 1000 includes a water separation tank 1010 for separating oil from bubbles sent from the pressurized floating tank 900 and a process oil storage tank 1010 for storing oil separated through the oil separation tank 1010 1020).

The water separated from the pressurized floating tank 900 is supplied to a process water storage tank 1100. The process water storage tank 1100 is provided with a mix washer 210, a wet vibration discriminator 220, The replenishing water storage tank 1200 for replenishing the water in the process water storage tank 1100 to a predetermined water level is connected to the system 320 and the high pressure injection system 520, .

As described above, in the complex contaminated soil purification system according to the embodiment of the present invention, if a single system is required, the valve is opened to transport heavy soil contaminated soil to the pickling tank and processed, and when the pickling is not necessary, It is understood that the basic technical idea is to omit the pickling process and purify the contaminated soil only with water. Therefore, many modifications may be made by those skilled in the art without departing from the scope and spirit of the present invention.

10 ... complex contaminated soil purification system 100 ... feeding device
200 ... cleaning and sorting device 300 ... altitude sorting device
400 ... pickling device 500 ... spit
600 ... Settling tank 700 ... Enrichment tank
800 ... Dewatering device 900 ... Pressurized floating tank
1000 ... Oil separation system 1100 ... Process water reservoir
1200 ... Replacement water reservoir

Claims (8)

A feeding device having a feed hopper and a feed conveyor for feeding contaminated soil;
A mix washer for spraying and cleaning the contaminated soil so as to clean the contaminated soil supplied from the feeding device while rotating the contaminated soil in an axial rotation manner, and a mix washer which is supplied with the contaminated soil washed from the mix washer, A cleaning and sorting device including a wet vibration discriminator for generating and discharging washed aggregates and discharging soil below a predetermined particle size,
A first hydrocyclone for discharging particles having a particle size smaller than the first reference particle size to the first outlet port and discharging particles having a particle size larger than the first reference particle size to the first outlet port by performing wet particle size separation on the soil introduced from the washing and sorting apparatus; A washing clean sand dewatering system for dehydrating water from particles having a first reference particle size or more and discharged from the first discharge port of the first hydrocyclone to produce washing sand; And a second hydrocyclone for performing particle size separation to discharge particles having a particle size smaller than the second reference particle size to the 2a outlet and discharging particles having a particle size larger than the second reference particle size to the 2b outlet,
An acid pickling bath which selectively communicates with the second discharge port of the second hydrocyclone to pick up the fine soil discharged from the second discharge port of the second hydrocyclone, An acid pickling agent supply tank for supplying an acid pickling agent to the pickling tank, and an acid pickling agent supplying agent for controlling the supply amount of pickling agent supplied to the pickling tank in the pickling agent supply tank, A neutralization tank for neutralizing the acidic soil treatment agent, a neutralization agent supply tank for supplying neutralization agent for neutralizing the acid treatment agent to the neutralization tank, and a neutralizing agent supply tank for supplying the neutralization agent to the neutralization tank, And a pickling device having a second open / close valve for controlling In the fire system,
Wherein the pickling select valve comprises: a first pickling select valve disposed between the second hydrocyclone and the pickling bath and adjacent to the second hydrocyclone side; and a second pickling selector valve disposed between the second hydrocyclone and the pickling clean sand dehydration system A second pickling select valve disposed between the first hydrocyclone and the pickling bath, a third pickling select valve disposed between the second hydrocyclone and the pickling bath and disposed adjacent to the pickling bath, And a fourth pickling select valve disposed between the pickling bath and the other one of the pickling baths,
The complex contaminated soil purification system comprises:
The second pickling select valve, the third pickling select valve and the fourth pickling select valve are opened and the second pickling select valve is closed so that the second hydrocyclone and the pickling bath are directly connected to each other in the micro- After the pickling process in which the heavy metal is eluted is performed, the cleaned sand is dewatered through the neutralization tank, and the cleaning process is performed with water in the clean sand dewatering system.
The second pickling select valve, the third pickling select valve and the fourth pickling select valve are closed and the second pickling select valve is opened, so that the second pickling clean sand dewatering system is directly connected to the second hydrocyclone, Characterized in that the pickling process is omitted for fine soil and the cleaning process is carried out only with water in the cleaning clean sand dewatering system. delete delete delete The method according to claim 1,
Further comprising an advanced water treatment device connected to the first and second hard cyclones,
The elevation water treatment apparatus includes:
A sedimentation tank connected to the first outlet of the first hydrocyclone and the second outlet of the second hydrocyclone to receive the fine gravel through the gravel screening apparatus to cause the fine gravel to be gravity settled to the bottom;
A sedimentation tank connected to the sedimentation tank to receive fine sediment not precipitated in the sedimentation tank and allowed to settle to the bottom using a flocculant;
A concentrating tank connected to the discharge end of the settling tank and the settling tank for storing the sludge discharged to the settling tank and the settling tank and generating concentrated sludge gravity separated,
And a dewatering device for introducing the concentrated sludge discharged from the concentrating tank and discharging the water to generate concentrated sludge as a dewatered cake
Wherein the system comprises: 6. The method of claim 5,
The elevation water treatment apparatus includes:
A pressurized floating vessel for receiving the water discharged from the settling tank and the water discharged from the dewatering device and forcibly floating the oil contained in the water through bubble generation;
And a water separation system for separating the oil contained in the bubbles into the bubbles introduced from the pressurized floating vessel
Further comprising the steps of: The method according to claim 6,
The elevation water treatment apparatus includes:
A process water reservoir for receiving water separated from the pressurized floating tank and supplying water to the mix washer, the wet vibration discriminator and the clean sand dehydration system;
And a replenishing water storage tank for replenishing water so that the water in the process water storage tank becomes a certain water level
Further comprising the steps of: delete

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