KR102378387B1 - Multi-stage particles separation release reactor and contaminated soils remediation system comprising thereof - Google Patents

Abstract

The present invention provides a multi-stage particle separation release reactor which improves heavy metal separation efficiency in soil and sand through particle separation of the soil and sand in a release tank including a serial multi-stage particle separation module, and a contaminated soil purification system comprising the same. The multi-stage particle separation release reactor is used in a contaminated soil purification system, and comprises: a release tank for mixing fine soil containing heavy metal with washing drug to use a mixture as slurry and to release heavy metal included in the fine soil containing heavy metal in liquid; a transfer line including a transfer pump for transferring the fine soil in the release tank; a serial multi-stage particle separation module coupled with the transfer line to perform multi-stage particle separation of the fine soil from the release tank; and a return line for returning the multi-stage particle separated fine soil into the release tank.

Description

Multi-stage particle size separation elution tank and contaminated soil purification system including the same

The present invention relates to a polluted soil purification system including a multi-stage particle size separation elution tank, and more particularly, by performing multi-stage particle size separation of fine soil in an elution tank including a serial multi-stage particle size separation module, heavy metals are separated and removed from fine soil It relates to a polluted soil purification system comprising a multi-stage particle size separation elution tank with increased efficiency.

In general, environmental pollution can be divided into air pollution, water pollution, and soil pollution. Among them, soil pollution in particular can pose a very serious threat to food production and cause contamination of drinking water sources through contamination of groundwater as well as surface water. Contaminated soil needs to be cleaned up early.

Soil pollution occurring in Korea in recent years is mainly caused by unauthorized landfilling or leakage accidents of liquid waste, and other soil contamination caused by underground diffusion of ground deposits left unattended in the course of long-term industrial activities. It is caused by several types of chemical species rather than a single type of compound, and the representative complex pollution is in the form of oil and heavy metals, occurring in most industrial areas.

Methods for restoring recently contaminated soil include physicochemical methods such as soil washing, incineration, solidification, stabilization and solvent extraction, and biological methods such as soil cultivation, composting, bioventing, and plant restoration. Among these methods, the relatively easy and rapid restoration of contaminated soil is the soil washing method.

The method of cleaning contaminated soil is a technique of using an appropriate cleaning agent to weaken the surface tension of harmful organic pollutants bound to soil particles or changing heavy metals into liquid phase to separate them from soil particles and treat them. On the other hand, it has the advantage that it can be applied regardless of the type of pollutant.

In the above, the soil washing method is divided into an in-situ method and an ex-situ method, and the in-situ method does not excavate the contaminated soil, but a washing solution injection well, a washing solution discharge well, a washing effluent treatment facility, a pump and an instrumentation facility It is a soil flushing method that directly washes the contaminated soil by circulating the cleaning agent in the contaminated soil to be treated by installing a volatile matter treatment facility, etc. on the contaminated site. Because there is no disadvantage, the ex-situ method is mainly applied as the soil washing method.

In the ex-situ method, after excavating the contaminated soil in the range to be treated by identifying the distribution of pollutants in the soil and the physical/chemical characteristics of the soil, an appropriate cleaning agent is used to clean the excavated contaminated soil in the presence of a cleaning device. As a washing method, it is used as a recently generalized soil washing method.

It is a technology for restoring soil by selecting and washing contaminated soil in multiple stages by conventional soil washing method to remove various contaminants including oil and heavy metals attached to the contaminated soil. Soil washing methods and apparatus for the treatment and screening) have been proposed.

In the prior art, the contaminated soil is selected through a dry screening step and a high-pressure watering screening step, and then washed in the first washing tank and separated into floating soil containing a large amount of contaminants and sediment soil containing a small amount of contaminants. , the separated sedimented soil is washed in the secondary washing tank and discharged into fine soil and coarse soil at the same time, and the coarse soil is dehydrated and returned to the soil for restoration. It is a technology that makes contaminated sludge for disposal through the process, and neutralizes and recycles the contaminated cleaning agent.

In this prior art, after selecting soil particles having a large particle size in a dry sorter and a high-pressure watering sorter, a washing 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. Since it is made into contaminated sludge and discarded, the waste treatment cost is not only excessive, but also causes secondary environmental pollution due to the waste.

In addition, when the metal component is very strongly bound to the soil particles only by the conventional soil washing technique, when the density and surface characteristics of the soil containing the metal component and the soil without the metal component are not clearly distinguished, the washing is caused by the various chemical properties of heavy metals When the technology is difficult to apply, when heavy metals are combined with soil particles of various sizes, when the silt/clay content exceeds 30-50% or in the case of a soil with a high humic content, organic matter with high viscosity is added to the soil If included, there was a problem in that it was difficult to effectively remove the contaminants adsorbed to the soil.

In particular, the conventional soil washing technology has a characteristic that the purification efficiency is low when the applied soil contains a large amount of fine soil, which is due to the characteristics of fine soil having a high specific surface area and a large amount of adsorption sites. Since organic and inorganic pollutants are more strongly adsorbed than in the case of

In addition, in the case of purifying heavy metal-contaminated soil, since pickling using a large amount of acid has been mostly applied up to now, it has disadvantages in terms of economic feasibility, eco-friendliness, workability, and safety.

One aspect of the present invention is to provide a polluted soil purification system including a multi-stage particle size separation elution tank that improves the efficiency of heavy metal separation in soil through particle size separation of soil and sand in a dissolution tank including a serial multi-stage particle size separation module. .

The multi-stage particle size separation elution tank according to an embodiment of the present invention is used in a contaminated soil purification system, and mixes heavy metal-containing fine soil with a cleaning agent to make a slurry, and at the same time, is included in the heavy metal-containing fine soil in the slurry A dissolution tank for eluting heavy metals into the liquid phase; and a transfer line provided with a transfer pump for transferring fine soil from the dissolution tank; and multi-stage particle size separation of fine soil and soil connected to the transfer line and introduced from the dissolution tank A series multi-stage particle size separation module performing

The serial multi-stage particle size separation module discharges particles less than the first standard particle size to the first discharge line through the first upper outlet with respect to the fine soil introduced from the dissolution tank, and discharges the particles having the first standard particle size or more to the first The first hydro cyclone returning to the dissolution tank through the lower outlet; and particles less than the second standard particle size with respect to the fine soil introduced through the first discharge line to the second discharge line through the second upper outlet and a second hydro cycle for discharging and returning particles having a particle size greater than or equal to the second reference particle size to the dissolution tank through a second lower outlet.

The regression line is a first regression line for returning particles of 0.2 mm or more separated in multi-stage particle size in the first hydro cyclone to the elution tank; and particles of 0.05 mm or more separated in multi-stage particle size in the secondary hydro cyclone and a second regression line returning to the dissolution tank.

The serial multi-stage particle size separation module discharges particles less than the first standard particle size to the first discharge line through the first upper outlet with respect to the fine soil introduced from the dissolution tank, and discharges the particles having the first standard particle size or more to the first lower portion The first hydrocyclone returning to the dissolution tank through the outlet and the first return line; and the nth standard for the fine soil introduced into the n-1 discharge line through the n-1 upper outlet of the immediately preceding hydro cyclone An n-th hydrocyclone (a natural number of n = 2 or more) that discharges particles of less than the particle size through the n-th upper outlet, and returns particles of the n-th standard particle size or larger to the elution tank through the n-th lower outlet and the n-th regression line );

It characterized in that it further comprises; a concentration sensor provided in the dissolution tank to detect the concentration of the treated water; and a control unit for controlling the pressure of the transfer pump according to the concentration of the treated water detected by the concentration sensor.

Contaminated soil purification system according to an embodiment of the present invention, a feeding device for supplying contaminated soil; and, receiving the contaminated soil provided from the feeding device, particles having a particle size greater than a predetermined standard particle size are generated and exported, and A dry sorting machine for discharging particles less than the predetermined standard particle size; and, receiving the contaminated soil washed from the dry sorter, generating secondary treated soil for particles of a predetermined standard particle size or more, and discharging the particles less than the predetermined reference particle size A first wet vibration sorter for discharging; and a first wet vibration sorter that receives the soil introduced from the first wet vibration sorter, generates and carries out tertiary treated soil particles with a particle size greater than a predetermined standard particle size, and discharges particles less than the predetermined reference particle size 2 wet vibration separator; and an elution tank for mixing the fine soil and soil introduced from the second wet vibration separator with a cleaning agent to form a slurry and at the same time eluting heavy metals contained in the fine soil into a liquid phase in the slurry; A transfer line provided with a transfer pump for transferring fine soil from the elution tank, a serial multi-stage particle size separation module connected to the transfer line to perform multi-stage particle size separation of the fine soil introduced into the elution tank, and the series multi-stage particle size separation A multi-stage particle size separation elution tank including a return line for returning the multi-stage particle size-separated fine soil and sand from the module to the elution tank; and neutralization to neutralize the washing water in which the fine soil and neutralizing agent introduced from the multi-stage particle size separation and elution tank are mixed A tank; and a sedimentation tank that is connected to the neutralization tank and causes the discharged upper layer water to settle to the bottom using a coagulant; and a concentration tank for concentrating the fine soil transferred from the settling tank; and a filter press that dehydrates to produce a dehydrated cake.

The serial multi-stage particle size separation module discharges particles less than the first standard particle size to the first discharge line through the first upper outlet with respect to the fine soil introduced from the dissolution tank, and discharges the particles having the first standard particle size or more to the first The first hydro cyclone returning to the dissolution tank through the lower outlet; and particles of less than the second standard particle size with respect to the fine soil introduced through the first discharge line through the second upper outlet and the second discharge line and a second hydro cycle for discharging to the settling tank and returning particles having a particle size greater than or equal to a second reference particle size to the elution tank through a second lower outlet.

The regression line is a first regression line for returning particles of 0.2 mm or more separated in multi-stage particle size in the first hydro cyclone to the elution tank; and particles of 0.05 mm or more separated in multi-stage particle size in the secondary hydro cyclone and a second regression line returning to the dissolution tank.

The serial multi-stage particle size separation module discharges particles less than the first standard particle size to the first discharge line through the first upper outlet with respect to the fine soil introduced from the dissolution tank, and discharges particles larger than the first standard particle size through the first lower outlet and the first hydrocyclone returning to the dissolution tank through the first return line; and the nth reference particle size for the fine soil introduced into the n-1th discharge line through the n-1th upper outlet of the immediately preceding hydrocyclone The nth hydrocyclone (n = a natural number greater than or equal to 2) that discharges particles less than the nth through the upper outlet and returns particles with a particle size greater than or equal to the nth standard through the nth lower outlet and the nth regression line to the elution tank; characterized by including.

Looking at the contaminated soil purification system according to an embodiment of the present invention from another aspect, an input hopper for supplying contaminated soil; and, by receiving the contaminated soil supplied from the input hopper, particles of 50 mm or more produce a first treated soil A first wet vibratory sorter that takes out and discharges particles of less than 50 mm, and receives the soil selected from the dry sorter, produces secondary treated soil for particles of 20 mm or larger, and discharges particles of less than 20 mm And, a second wet vibrating sorter that receives the fine soil discharged from the first wet vibrating sorter, produces and carries out tertiary treated soil for particles of 2 mm or more, and discharges particles of less than 2 mm, and the second wet vibrating sorter An elution tank for mixing the fine earth and sand introduced from the system into a slurry and at the same time eluting the heavy metal contained in the fine soil into a liquid phase in the slurry, and a transfer pump for transferring the fine soil from the dissolution tank are provided a transfer line connected to the transfer line and a serial multi-stage particle size separation module for performing multi-stage particle size separation of fine soil introduced into the elution tank; A multi-stage comprising: a return line for returning; a concentration sensor provided inside the elution tank to detect the concentration of treated water; and a control unit for controlling the pressure of the transfer pump according to the concentration of the treated water detected by the concentration sensor A particle size separation and elution tank; and a neutralization tank for neutralizing the washing water mixed with fine earth and neutralizing agent discharged from the multi-stage particle size separation and elution tank; A settling tank for allowing the treated water to settle to the bottom using a coagulant; And a concentration tank for concentrating the fine soil transferred from the settling tank; It is characterized in that it includes.

The serial multi-stage particle size separation module discharges particles less than the first standard particle size to the first discharge line through the first upper outlet with respect to the fine soil introduced from the dissolution tank, and discharges the particles having the first standard particle size or more to the first lower portion The first hydro cyclone returning to the dissolution tank through the outlet and the first return line; and the n-th fine soil introduced into the n-1 discharge line through the n-1 upper outlet of the immediately preceding hydro cyclone An n-th hydrocyclone (n = 2 or more) that discharges particles less than the reference particle size through the n-th upper outlet, and returns particles of the n-th reference particle size or larger to the elution tank through the n-th lower outlet and the n-th return line. natural number);

Therefore, the polluted soil purification system according to an embodiment of the present invention performs multi-stage particle size separation of soil and soil in an elution tank including a serial multi-stage particle size separation module to elute heavy metals from soil to improve separation efficiency for multi-stage particle size separation There is an effect of the polluted soil purification system, including the release of water.

1 is a layout view showing a contaminated soil purification system according to an embodiment of the present invention.
Figure 2 is a process diagram showing the contaminated soil purification system shown in Figure 1;
3 is a conceptual diagram illustrating the contaminated soil purification system shown in FIG. 1 .
4 is a plan view showing a multi-stage particle size separation elution tank according to an embodiment of the present invention.
5 is a front view showing a multi-stage particle size separation elution tank according to an embodiment of the present invention.
6 is a view showing a multi-stage particle size separation elution tank according to another embodiment of the present invention.
7 is a view showing a multi-stage particle size separation elution tank according to another embodiment of the present invention.

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

1 is a layout view showing a polluted soil purification system according to an embodiment of the present invention, FIG. 2 is a process diagram showing the polluted soil purification system shown in FIG. 1, and FIG. 3 is a polluted soil purification system shown in FIG. It is a conceptual diagram.

1 to 3 , the contaminated soil purification system 10 according to an embodiment of the present invention is a feeding device 100 for supplying contaminated soil, and washing for dry and wet sorting of the supplied contaminated soil. Inflow from the multi-stage particle size separation elution tank 500 including the sorting device 200-400, the serial multi-stage particle size separation modules 530 and 540 for eluting heavy metals from the washed and sorted contaminated soil, and the multi-stage particle size separation elution tank 500 A neutralization tank 600 for neutralizing the treated water in which the fine soil and neutralizing agent are mixed; (800), is configured to include a filter press (900) for dewatering the concentrated fine silt.

The feeding device 100 is for supplying the soil mixed with the input pollutants to the washing and sorting devices 200 to 400 in a quantitative manner. , is disposed on the side of the input hopper 110 and is configured to include an input conveyor 120 for quantitatively transferring contaminated soil to the washing and sorting devices 200 to 400 .

That is, the contaminated soil supplied to the input hopper 110 is supplied to the washing and sorting devices 200 to 400 through the input conveyor 120 . At this time, the properties of the contaminated soil are not distinguished, but the time can be determined according to the degree of contamination in the post-process by grasping the degree of contamination.

Contaminated soil input to the washing and sorting devices 200 to 400 through the feeding device 100 is separated according to the desorption and particle size of oil and heavy metals in the washing and sorting devices 200 to 400. These washing and sorting devices 200 ~400) produces treated soil by selecting particles of a certain particle size or more, and proceeds with the subsequent process by screening and passing only particles of less than a certain particle size.

Specifically, the feeding device 100 is connected to the washing and sorting devices 200 to 400 for performing a process of increasing the efficiency of the purification process by separating oil and heavy metals from the soil.

These washing and sorting devices 200 to 400 selectively discharge particles of a first particle size (eg, 50 mm) or more from the contaminated soil supplied from the feeding device 100 to the first treated soil, and pass only particles less than the first particle size The dry sorter 200, which proceeds the subsequent process, receives the contaminated soil supplied from the dry sorter 200, and selects and discharges particles of a second particle size (for example, 20 mm) or larger to the second treated soil, and is less than the second particle size The first wet vibration sorter 300 that proceeds with the subsequent process by passing only the particles of 3 It may be configured to include a second wet vibrating separator 400 that selects and discharges the treated soil and passes only the particles of less than the third particle size to proceed with the subsequent process.

Specifically, the feeding device 100 is for supplying the soil mixed with the input pollutants to the dry sorter 200 in a quantitative manner. , is disposed at the lower end of the input hopper 110 and is configured to include an input conveyor 120 for transferring contaminated soil to the dry sorter 200 .

The agglomerated contaminated soil fed into the dry sorter 200 through the feeding device 100 is loosened in the dry sorter 200, and the dry sorter 200 sorts particles of a first particle size (eg, 50 mm) or larger, and Only the particles of the first particle size or smaller are passed through the subsequent process.

Particles of a first particle size (eg, 50 mm) or less discharged from the dry sorter 200 are introduced into the first wet vibration sorter 300 to sort particles of a second particle size (eg, 20 mm) or more, and the second Only particles of a particle size (eg, 20 mm) or less are passed through the subsequent process.

That is, the first wet vibrating separator 300 mixes the particles having a first particle size (eg, 50 mm) or less discharged from the dry separator 200 with the treated water provided from the process water tank 20 and then the second particle size (For example, 20mm) or larger particles are screened and only particles having a second particle size (for example, 20mm) or less are passed through the process so that the subsequent process can proceed.

Particles having a second particle size (eg, 20 mm) or less discharged from the first wet vibration separator 300 are introduced into the second wet vibration separator 400 to sort particles having a third particle size (eg, 2 mm) or larger. and the third particle size (eg, 2 mm) or less passes through the subsequent process.

That is, the second wet vibration separator 400 selects particles of a third particle size (for example, 2 mm) or more from among particles having a second particle size (for example, 20 mm) or less discharged from the first wet vibration separator 300 . Select and pass only fine particles of a third particle size (eg, 2 mm) or less to allow subsequent processing.

The fine soil composed of particles of a third particle size (eg, 2 mm) or less discharged through the second wet vibrating separator 400 is introduced into the multi-stage particle size separation elution tank 500, and then mixed with a washing chemical to remove the fine soil from the fine soil. Heavy metals may be eluted.

The multi-stage particle size separation elution tank 500 includes an elution tank 510 for eluting heavy metals from the fine soil containing heavy metals supplied from the second wet vibration separator 400 , and the fine particles introduced from the elution tank 510 . It is configured to include serial multi-stage particle size separation modules 530 and 540 for performing multi-stage particle size separation of soil and then returning it back to the dissolution tank 510 .

The dissolution tank 510 accommodates the heavy metal-containing fine earth and sand containing particles of a third particle size (eg, 2 mm) or less supplied from the second wet sorter 400 , and cleaning chemicals supplied from the chemical tank.

In the dissolution tank 510, a cleaning agent is mixed with the fine soil containing heavy metals to form a slurry, and the slurry is mixed and stirred for a predetermined time to dissolve the heavy metals contained in the fine soil containing heavy metals in a liquid phase to be eluted.

The dissolution tank 510 is provided with a stirring device 511, and by rotating the stirring blade 512, the slurry can be mixed and stirred for a predetermined time.

On the other hand, the dissolution tank 510 may be made of a material with strong corrosion resistance, for example, stainless steel in order to prevent corrosion by the acid cleaner.

A multi-stage particle size separation elution tank according to an embodiment of the present invention will be described with reference to FIGS. 4 and 5 . 4 is a plan view showing a multi-stage particle size separation elution tank according to an embodiment of the present invention, and FIG. 5 is a front view showing a multi-stage particle size separation elution tank according to an embodiment of the present invention.

4 and 5, in the multi-stage particle size separation elution tank 500 according to an embodiment of the present invention, particles having a third particle size (for example, 2 mm) or less introduced into the elution tank 510 The heavy metal-containing fine soil including is introduced into the series multi-stage particle size separation modules 530 and 540 through a transfer line 520 equipped with a transfer pump 521 .

These serial multi-stage particle size separation modules 530 and 540 are connected to the transfer line 520 and perform multi-stage particle size separation on the soil introduced from the dissolution tank 510 through the return lines 550 and 560 only for particles having a standard particle size or more. It is configured to include hydrocyclones 530 and 540 that return to the elution tank 510 and transfer the particles less than the reference particle size directly to the settling tank 700 .

The fine soil having particles of a third particle size (eg, 2 mm) or less introduced into the dissolution tank 510 is introduced into the hydrocyclones 530 and 540 through the transfer pump P.

The hydro cyclones 530 and 540 perform particle size separation on the fine soil introduced through the transfer line 520 in a wet manner to remove particles of less than the first reference particle size (eg, 0.2 mm) from the first upper outlet 531 . The first hydro cyclone 530 and the first hydro cyclone 530 for discharging to and discharging particles of a first standard particle size (eg, 0.2 mm) or more to the first lower outlet 532, and the first hydro cyclone 530 to particles that have passed through By performing particle size separation in a wet manner, particles less than the second reference particle size (eg, 0.05 mm) are discharged to the second upper outlet 541, and particles greater than or equal to the second reference particle size (eg, 0.05 mm) are removed 2 is configured to include a secondary hydro cyclone 540 discharged to the lower outlet (542).

The first hydro cyclone 530 performs particle size separation based on a first reference particle size (eg, 0.2 mm) in a wet manner, and the first hydro cyclone 530 has a hollow conical first taper. It consists of a part and a first nozzle part, the first inlet 533 entering in the tangential direction of the cylinder, the first upper outlet 531 connected to the wide inlet side of the first tapered part, and the first nozzle part It is composed of a first lower outlet 532 that is connected.

That is, water and fine earth and sand provided from the dissolution tank are introduced to the first inlet 533 side through the transfer line 520 provided with the transfer pump 521, and a large vortex caused by a vortex phenomenon and centrifugal force inside the first tapered part. and small vortices and a vertical flow passing through them in the axial direction.

At this time, a difference occurs in centrifugal force due to the difference in the weight of the particles, so that particles having a particle size greater than or equal to the first reference particle size (eg, 0.2 mm) and a particle size less than the first reference particle size (eg, 0.2 mm) are separated. particles and water are separated.

In other words, particles and water less than the first reference particle size (eg, 0.2 mm) are discharged through the first upper outlet 531, and particles having a first reference particle size (eg, 0.2 mm) or more are first It is discharged through the lower outlet 532, and at this time, by adjusting the length of the first tapered portion and the inlet area ratio of both ends, it is possible to separate fine soil based on a desired first standard particle size (eg, 0.2 mm).

Particles and water less than a first reference particle size (eg, 0.2 mm) discharged through the first upper outlet 531 of the first hydrocyclone 530 are secondary through the first discharge line 534 . Particles of a first standard particle size (eg, 0.2 mm) or more supplied to the hydro cyclone 540 and discharged through the first lower outlet 532 are transferred to the elution tank 510 through the first return line 550 . is returned

In addition to the particles returned to the elution tank 510 through the first return line 550 in this way, the remaining particles are again supplied to the second hydrocyclone 540 through the first discharge line 534, so that the altitude selection can be continued. let it be

The secondary hydro cyclone 540 performs particle size separation in a wet manner to discharge particles less than a second reference particle size (eg, 0.05 mm) to the second upper outlet 541 and a second reference particle size (eg, For example, 0.05 mm) or more of particles are discharged to the second lower outlet 542 , and this secondary hydro cyclone 540 has the same configuration as the first hydro cyclone 530 and is wet to a second standard particle size. (eg, 0.05 mm) to perform particle size separation.

That is, the secondary hydro cyclone 540 is composed of a second tapered portion and a second nozzle portion of a largely hollow conical shape, and a second inlet 543 that enters in the tangential direction of the cylinder, and the second tapered portion. It consists of a second upper outlet 541 connected to the wide inlet side, and a second lower outlet 542 connected to the second nozzle portion.

In this way, the particles of less than the second standard particle size (eg, 0.05 mm) discharged to the second upper outlet 541 of the secondary hydro cyclone 540 are transferred to the settling tank 700 through the second discharge line 544 . Particles of a second standard particle size (eg, 0.05 mm) or more supplied and discharged to the second lower outlet 542 are transferred to the elution tank 510 through the second return line 560 to separate the heavy metal As the elution proceeds, heavy metals can be removed more efficiently.

In addition, since the ultrafine particles of less than 0.05 mm are transferred directly to the settling tank 700 through the first hydrocyclone 530 and the second hydrocyclone 540 in the elution tank 500, in the heavy metal elution step and the neutralization step Of course, there is an environmental advantage by reducing the use of unnecessary acid washing solution and neutralizing agent for ultrafine particles of less than 0.05 mm.

Meanwhile, a cleaning agent for efficiently eluting heavy metals may be supplied to the dissolution tank 510 . Various cleaning agents can be used for these cleaning agents for efficient separation of contaminants. For example, a first cleaning agent containing a surfactant that increases the activity of the soil particle interface and a complex compound by eluting heavy metal cations bound to soil particles It may include a second cleaning agent containing a chelating agent to prevent recombination of soil particles and heavy metals, and a third cleaning agent containing an oxidizing agent that oxidizes and decomposes pollutants bound to or detached from soil particles.

The treated water discharged from the elution tank 510 may be provided to the settling tank 700 through the neutralization tank 600 . In this neutralization tank 600 , the treated water supplied from the process water tank 20 is a neutralizer tank 610 . The neutralizing agent supplied from is mixed and provided.

The soil and wastewater of a certain particle size or less supplied to the neutralization tank 600 may be neutralized using washing water mixed with a neutralizing agent, and this neutralizing agent neutralizes the washing chemical supplied to the elution tank 510 in the settling tank 700 . make it reusable.

That is, the supernatant water and ultrafine soil discharged from the neutralization tank 600 are supplied to the settling tank 700 .

The ultrafine soil and washing water supplied to the settling tank 700 are coagulated and precipitated by administering a coagulant to the settling tank 700 , and the precipitated ultrafine soil is supplied to the filter press 900 through the thickening tank 800 and , the supernatant is supplied to the treatment water tank 21 to be reused as washing water.

At this time, the coagulant is supplied through a separate coagulant tank 710, and the coagulant and process water supplied through the coagulant tank 710 and the process water tank 20 are mixed with each other in the coagulant tank 710 and are introduced into the settling tank 700. will be. The coagulant is a material that precipitates solid particles suspended in a liquid by aggregating them together. An inorganic electrolyte or an organic polymer compound is used.

The coagulant is a material that precipitates solid particles suspended in a liquid by aggregating them together. An inorganic electrolyte or an organic polymer compound is used.

The sediment deposited in the sedimentation tank 700 is provided to the concentration tank 800 , and the discharged supernatant water is provided to the treatment tank 21 .

The concentration tank 800 concentrates the fine soil supplied from the sedimentation tank 700 and is transferred to the filter press 900 , which dehydrates the concentrated fine soil and sand and discharges it as a dewatering cake, and dewatering The filtered solution in the process is transferred to the process water tank 20 through the treatment water tank 21, and the dehydrated cake may be transferred to a separate dewatered cake treatment facility.

Therefore, the polluted soil purification system 10 according to an embodiment of the present invention improves the efficiency of separating heavy metals from fine soil through multi-stage particle size separation of fine soil in the elution tank 510 including serial multi-stage particle size separation modules 530 and 540 . has the effect of making

Another embodiment of the present invention will be described with reference to FIG. 6 . When the same components as in the above-described embodiment are denoted by the same reference numerals, the description thereof is omitted. 6 is a view showing a contaminated soil purification system according to another embodiment of the present invention.

As shown in FIG. 6 , in the multi-stage particle size separation elution tank 500a according to another embodiment of the present invention, the heavy metal-containing fine soil is mixed with a cleaning agent to form a slurry, and the heavy metal-containing fine soil is mixed in the slurry. A dissolution tank 510 for dissolving heavy metals contained in the liquid phase; and a conveying line 520 provided with a conveying pump 521 for conveying soil from the dissolution bath 510; and the conveying line ( Serial multi-stage particle size separation module (530,540, ..., 540n) connected to 520) to perform multi-stage particle size separation of the soil introduced from the elution tank 510; and the series multi-stage particle size separation module (530, 540, .. Including;

The serial multi-stage particle size separation module (530, 540, ..., 540n) is the first through the first upper outlet (531) for particles less than the first standard particle size with respect to the micro-contaminated soil introduced from the dissolution tank (510). The first hydro cyclone 530 for discharging to the discharge line 534 and returning particles having a particle size greater than or equal to the first reference particle size to the dissolution tank through the first lower outlet 532 and the first return line 550; And, Particles of less than the nth standard particle size with respect to the finely polluted soil introduced from the n-1 th discharge line 544 through the n-1 th upper outlet 541 of the immediately preceding hydro cyclone 540 are removed from the nth upper outlet ( 541n) and an n-th hydrocyclone (n=2 or more natural number) that discharges through the n-th discharge line 560n and returns particles having a particle size greater than or equal to the n-th standard particle size to the elution tank 510 through the n-th lower outlet 542n. ); is included.

The first hydro cyclone 530 receives the contaminated soil introduced from the dissolution tank 510 and discharges the first multi-stage particle size separated fine soil based on the first reference particle size.

The n-th hydro cyclones 530 and 540 have the n-1 th multi-stage particle size supplied from the n-1 th upper outlet 541 and the n-1 th discharge line 544 discharged from the immediately preceding hydro cyclones 530 and 540 . Multi-stage grains of separated soil are also separated again and discharged. In this case, n is a natural number equal to or greater than 2, and may be generally set to 3.

The particle size of the final multi-stage particle size separated fine soil discharged from the last-order hydro cyclone 544 while repeating this multi-stage particle size separation process and passing n hydro cyclones 530, 540, ..., 540 n can be increased to a required level. .

In this way, the multi-stage particle size separation and elution tank 500a according to another embodiment of the present invention can increase the particle size of fine soil to a required level, thereby bringing about a more excellent heavy metal elution effect from the elution tank 510 .

Another embodiment of the present invention will be described with reference to FIG. 7 . When the same components as in the above-described embodiment are denoted by the same reference numerals, the description thereof is omitted. 7 is a view showing a contaminated soil purification system according to another embodiment of the present invention.

As shown in FIG. 7 , in the multi-stage particle size separation elution tank 500b according to another embodiment of the present invention, the heavy metal-containing fine earth and sand is mixed with a cleaning agent to form a slurry, and the heavy metal-containing fine soil is mixed in the slurry. A dissolution tank 510 for dissolving heavy metals contained in soil into a liquid phase; and a conveying line 520 provided with a conveying pump 521 for conveying soil from the dissolution bath 510; and the conveying line Serial multi-stage particle size separation modules 530 and 540 that are connected to 520 and perform multi-stage particle size separation of the soil introduced from the dissolution tank 510; Return lines 550 and 560 for returning to the dissolution tank 510; and a conveying valve 522 positioned adjacent to the conveying pump 521 on the conveying line 520, and provided inside the dissolution tank 510 A concentration sensor 523 that detects the concentration of the treated water containing soil and soil; and the pressure of the transfer pump 521 and the transfer valve 522 according to the concentration of the treated water sensed by the concentration sensor 523 The control unit 524 for controlling the degree of opening and closing; may be configured to include.

The concentration sensor 523 of the multi-stage particle size separation elution tank 500b according to another embodiment of the present invention detects the concentration of the treated water provided in the elution tank 510 .

The controller 524 controls the transfer pump 521 positioned at the front end of the first hydrocyclone 530 according to the concentration of the treated water detected by the concentration sensor 523 .

In addition, the control unit 524 increases the opening degree of the transfer valve 522 when the concentration range of the treated water detected by the concentration sensor 523 exceeds the upper limit value, and when the concentration range is less than the lower limit value of the transfer valve 522 The degree of opening can be reduced.

In this way, the multi-stage particle size separation dissolution tank 500 according to another embodiment of the present invention is controlled according to the concentration of the treated water containing fine soil, so that a more excellent heavy metal elution effect can be obtained from the dissolution tank 510. there will be

On the other hand, in the multi-stage particle size separation elution tank 500 according to another embodiment of the present invention, n hydrocyclones (530,540,...,540n) are introduced to increase the particle size of fine soil to the required level. Of course, it is possible to bring more excellent heavy metal elution effect in the dissolution tank (510).

As described above, the contaminated soil purification system according to the embodiment of the present invention is a basic technical idea to improve the heavy metal separation efficiency from fine soil through multi-stage particle size separation of fine soil in an elution tank including a serial multi-stage particle size separation module. it can be seen that Accordingly, many other modifications are possible for those of ordinary skill in the art within the scope of the basic technical spirit of the present invention.

10...Contaminated soil purification system 20...Process water tank
100...Feeding device 200...Dry sorting machine
300...1 wet vibration separator 400...2 wet vibration separator
500...Multi-stage particle size separation elution tank 600...Neutralization tank
700...sedimentation tank 800...concentration tank
900... filter press

Claims (11)

A feeding device for supplying contaminated soil; and
A dry sorter that receives the contaminated soil provided from the feeding device, generates and transports particles having a particle size greater than a predetermined standard particle size, and discharges particles less than the predetermined reference particle size; and
A first wet vibrating sorter that receives the contaminated soil washed from the dry sorter, generates secondary treated soil for particles with a particle size larger than a predetermined standard, and discharges particles smaller than the predetermined standard particle size; and
A second wet vibration sorter that receives the soil introduced from the first wet vibration sorter, generates and carries out tertiary treated soil for particles having a particle size greater than a predetermined standard particle size, and discharges particles less than the predetermined reference particle size; and
An elution tank for mixing the fine soil introduced from the second wet vibrating separator with a cleaning agent to form a slurry and at the same time eluting heavy metals contained in the fine soil into a liquid phase in the slurry, and transferring the fine soil from the dissolution tank A serial multi-stage particle size separation module that is connected to a transfer line equipped with a transfer pump for a return line for returning to the dissolution tank; a transfer valve positioned adjacent to the transfer pump on the transfer line; and a concentration sensor provided inside the elution tank to detect the concentration of treated water containing soil and sand; A multi-stage particle size separation dissolution tank having a control unit for controlling the pressure of the transfer pump and the degree of opening and closing of the transfer valve according to the concentration of the treated water detected by the concentration sensor;
A neutralization tank for neutralizing the washing water mixed with the fine soil and the neutralizing agent introduced from the multi-stage particle size separation elution tank; And,
A sedimentation tank connected to the neutralization tank and allowing the discharged upper layer water to settle to the bottom using a coagulant;
Concentrating tank for concentrating the fine soil transferred from the settling tank; And,
It includes; a filter press that dehydrates the concentrated fine earth and sand discharged from the concentration tank to produce a dehydrated cake;
The serial multi-stage particle size separation module discharges particles of less than 0.2 mm to the first discharge line through the first upper outlet with respect to the fine soil introduced from the dissolution tank, and discharges particles of 0.2 mm or more to the first lower outlet through the first lower outlet. The first hydro cyclone returning to the dissolution tank and the ultrafine particles of less than 0.05 mm with respect to the fine soil introduced through the first discharge line are discharged into the settling tank through the second upper outlet and the second discharge line, and 0.05 A secondary hydrocyclone for returning particles of mm or more to the dissolution tank through the second lower outlet,
The regression line includes a first regression line for returning the particles of 0.2 mm or more separated in multi-stage particle size in the first hydro cyclone to the elution tank, and the particles of 0.05 mm or more separated in multi-stage particle size in the second hydro cyclone. It includes a second regression line that returns to the dissolution tank,
The control unit, but controls the transfer pump located at the front end of the first hydrocyclone according to the concentration of the treated water detected by the concentration sensor, the concentration range of the treated water detected by the concentration sensor exceeds the upper limit value In the case of increasing the degree of opening of the transfer valve, and when the concentration range is less than the lower limit, decreasing the degree of opening of the transfer valve
The cleaning agent includes a first cleaning agent containing a surfactant that increases the activity of the soil particle interface, and a second cleaning agent containing a chelating agent that elutes heavy metal cations bound to soil particles to form a complex compound so that soil particles and heavy metals do not recombine and a third cleaning agent containing an oxidizing agent that oxidizes and decomposes pollutants bound to or detached from soil particles,
Depending on the degree of opening of the transfer valve,
The fine particles of 0.05 mm or larger are transferred to the precipitation tank after going through a heavy metal elution step and a neutralization step by the first cleaning agent, the second cleaning agent, the third cleaning agent and the neutralizing agent in the elution tank and the neutralization tank,
The ultra-fine particles of less than 0.05 mm are transferred directly to the settling tank through the first and second hydro cyclones in the elution tank. Contaminated soil purification system including an elution tank equipped with a serial multi-stage particle size separation module, characterized in that it reduces unnecessary use of the first cleaning agent, the second cleaning agent, the third cleaning agent, and the neutralizing agent. delete delete delete delete delete delete delete delete delete delete

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