KR100974911B1 - Movable water cleaning system - Google Patents

Abstract

The present invention relates to a fluid washing system for purifying contaminated soil, and in particular, a primary screen for sorting and discharging excavated contaminated soil by particles; A fluidized washing tank for washing the selected contaminated soil discharged from the primary screen by using washing water, a solvent according to the type of contamination, and air for flowing; A blower for supplying flow air to the flow washing tank; A secondary screen for selecting and discharging the washing soil discharged from the flow washing tank for each particle; An agglomeration tank for stirring the washing water and the coagulant containing the unselected fine particles discharged from the secondary screen; A precipitation tank for concentrating the contaminants discharged from the flocculation tank for a long time and concentrating; A cake maker for dewatering contaminants discharged from the settling tank to be produced and discharged into a cake, and supplying the discharged contaminated water to the coagulation tank through a supply pipe; And it is characterized in that it comprises a flow rate adjusting tank for receiving the supernatant of the settling tank and re-introduced into the flow washing tank. According to the present invention as described above, there is no frequent mechanical defects caused by the mechanical mixing that is generally used, and the cleaning process can be achieved economically and stably by using a fluidized washing tank which is simple in structure and obtains sufficient physical mixing effect. There is an advantage and the maintenance is also very advantageous.

 Pollution, soil, liquid, washing, ultrasonic, air, solvent

Description

Fluid Washing System for Polluted Soil Cleaning {MOVABLE WATER CLEANING SYSTEM}

The present invention relates to a fluid washing system for purifying contaminated soil, and in particular, after excavating and screening various contaminated soils, washing them through a fluid washing tank equipped with an ultrasonic generator, and then discharging them through a vibrating screen for separating the washed soil particles. In addition, the present invention relates to a fluid washing system for purifying contaminated soil that allows fine soil particles and contaminants contained in a turbid liquid to be discharged into a dehydration cake through agitation, precipitation, and dehydration, and recycles the supernatant treated in the precipitation process to washing water.

Polluted soils can occur from soil pollution such as oil reservoirs, military bases, and coal mines around us, river sediments, lakes and marine dredged soils.

Soil pollution, unlike water quality and air pollution, is not easily revealed due to its recent severity and interest in treatment.

The concentration of heavy metals exceeding the standard is steadily detected in the soil pollution survey of industrial areas such as factories, waste landfills, waste metal mines, railway vehicle bases, and military bases.

In addition, dredging of sedimentary soils is planned and implemented in the river, water source, ocean, etc. in order to protect water quality and various demands.

Accordingly, due to the soil containing a large amount of oil, heavy metals and various organic pollutants are causing various environmental pollution problems in the ecosystem.

A technique that has been studied a lot as an appropriate treatment method for these contaminated soils or sediments is a soil washing technique represented by a soil washing technique.

In general, the process of washing soil that has been contaminated is a technology to purify contaminated soil by moving or dissolving soil in soil to the washing solvent from the soil's solids using mechanical friction and dissolving soil. It is reclaimed or taken out on-site, and the remaining solution is separated from wastewater treatment and reused as a solvent.

If the pollutant is an oil component, use a detergent such as an ionic or nonionic surfactant to weaken the surface tension of harmful organic pollutants bound to the soil particles and move it to the wash water. Aqueous solutions, such as strong acid, strong alkali, organic acid, and EDTA, are used as washing liquid.

In general, the cleaning device for treating the excavated contaminated soil or dredged soil is registered with a number of related patents, and although it is also used in the actual field, in the method, the friction and the noise are severe by simply rotating the cylinder or physical mechanical stirring. There are a number of practical problems in dealing quickly with a large capacity such as frequent failures, such as chemical precipitation methods that use excessive chemicals, poor cleaning efficiency, and long time, even if the efficiency is high.

In particular, when using heavy acid and strong alkali in the treatment of heavy metals, the efficiency is good, but when storing in the field there is a high risk of accidents, various problems such as device corrosion problems can occur. The biggest problem in the cleaning method is that when the clay component is present in more than 25% of the soil, it is difficult to adopt it as a purification method in the field due to the drastic decrease in pollution treatment efficiency associated with the adsorption of soil particles and contaminants.

The above-mentioned problems have a need for a technique for effectively and economically treating a large amount of contaminated soil in the field while using less drugs or using safe drugs for various reasons.

The present invention is to solve the problems as described above, to safe the site workers from mechanical hazards and dangers due to chemical storage, there is no problem such as corrosion of the device, and to increase the processing speed to handle large amounts of contaminated soil It is equipped with an ultrasonic generator, and it has a flow washing system for cleaning polluted soil with excellent cleaning efficiency by equipping with a washing water mixed with solvent for each pollutant and an ultrasonic and flowable air. The purpose is to provide.

Features of the present invention for achieving the above object,

A primary screen for sorting and discharging the excavated contaminated soil by particles; A fluidized washing tank for washing the selected contaminated soil discharged from the primary screen by using washing water, a solvent according to the type of contamination, and air for flowing; A blower for supplying flow air to the flow washing tank; A secondary screen for selecting and discharging the washing soil discharged from the flow washing tank for each particle; An agglomeration tank for stirring the washing water and the coagulant containing the unselected fine particles discharged from the secondary screen; A precipitation tank for concentrating the contaminants discharged from the flocculation tank for a long time and concentrating; A cake maker for dewatering contaminants discharged from the settling tank to be produced and discharged into a cake, and supplying the discharged contaminated water to the coagulation tank through a supply pipe; And it is characterized in that it comprises a flow rate adjusting tank for receiving the supernatant of the settling tank and re-introduced into the flow washing tank.

Here, between the primary screen and the fluid washing tank is further provided with a first conveyor belt for supplying the contaminated soil selected by the primary screen to the fluid washing tank.

Here too, the primary screen is an inclined screen or a vibrating screen.

Here, the discharge side of the secondary screen is further provided with a second conveyor belt for discharging and loading the washing soil selected by the secondary screen.

Here again, the secondary screen is a vibrating screen.

Here, when the clay content of the contaminated soil is 25% or more, between the secondary screen and the coagulation tank, unselected fine particles discharged from the secondary screen are manufactured and discharged into a cake, and the discharged washing water is discharged. It is further provided with an auxiliary cake maker for supplying the coagulation tank through the supply pipe.

Here, the cake maker and the auxiliary cake maker are any one of a belt press, a filter press, and a centrifuge.

Here, the flow type washing tank is formed inside the hollow cone shape, the inlet is formed on the upper surface, the outlet is formed on the side extending, the air supply port for the flow is formed in the bottom center; An ultrasonic generator attached to the outer circumferential surface of the main body at equal intervals; A solvent inlet tube formed on an upper surface of the main body such that the solvent is introduced; It consists of a washing water inlet tube formed on the upper surface of the main body so that the washing water.

Here, the discharge port of the main body further includes a gate valve for controlling the discharge amount.

Here, a check valve is further provided on the connection conduit between the main body and the blower to block the washing water of the main body from flowing back to the blower.

Here, the washing water input pipe receives the washing water through the pump from the flow rate adjustment tank.

Here, the washing water input pipe is supplied with river water or tap water through a replenishment pipe to replenish the washing water.

Here, the replenishment pipe further includes an solenoid valve for controlling a supply amount of river water or tap water.

Here, the body further adjusts the level of the turbid liquid mixed with the wash water and the solvent in conjunction with the pump and the solenoid valve to further detect the water level of the water level on the inner top side to block the discharge through the inlet Equipped.

Here, the ultrasonic generator is formed at an interval of 40 ~ 60 cm in the height direction of the main body, 30 ~ 50 cm in the circumferential direction of the main body, it is installed up to the height of the water gauge.

Here, the blower is installed higher than the installation position of the water gauge of the floating washing tank to block the washing water of the main body to flow back to the blower.

According to another aspect of the present invention,

1. A method of washing a soil for purification of soil using the flow washing system for purification of soil contamination, the method comprising: a first sorting step of selecting and discharging excavated soil soil by particles; A washing step of washing the first sorted contaminated soil by washing with a turbid liquid mixed with washing water and a solvent according to the type of contamination, and using ultrasonic waves and air for discharge; Selecting a washing soil for each particle to separate and discharge the washing water including the washing soil having a predetermined size or more and the washing soil having a predetermined size or less; A stirring step of stirring the washing water discharged during the second screening with the flocculant; A precipitation step of precipitating the stirred wash water; And a cake manufacturing step of dewatering contaminants contained in the precipitated wash water to prepare a cake.

Here, the washing step detects the washing water level and maintains a constant water level, but if the water level is low, the supernatant and the supplementary water separately stored in the precipitation step are replenished.

According to another aspect of the present invention,

In the contaminated soil cleaning flow washing method using the contaminated soil cleaning liquid cleaning system,

A primary sorting step of sorting out the excavated polluted soil by particles and then discharging it; A washing step of washing the first sorted contaminated soil by washing with a turbid liquid mixed with washing water and a solvent according to the type of contamination, and using ultrasonic waves and air for discharge; Selecting a washing soil for each particle to separate and discharge the washing water including the washing soil having a predetermined size or more and the washing soil having a predetermined size or less; A primary cake manufacturing step of dewatering and washing the soil having a predetermined size or less included in the washing water discharged after the second sorting to produce a cake; A stirring step of stirring the washing water discharged during the preparation of the first cake with a flocculant; A precipitation step of precipitating the stirred wash water; And a secondary cake manufacturing step of dewatering contaminants contained in the precipitated wash water to prepare a cake.

Here, the primary cake manufacturing step is performed when the clay content of the soil contaminated soil is 25% or more.

Here, the washing step detects the washing water level and maintains a constant water level, but when the water level is low, the supernatant and the supplementary water separately stored in the precipitation step are replenished.

According to the present invention, the contaminated soil cleaning system configured as described above, there is no frequent mechanical defects caused by the mechanical mixing that is generally used, and the structure is simple and economical by using the liquid washing tank which can obtain a sufficient physical mixing effect. In addition, there is an advantage to achieve a stable cleaning process and maintenance is also very advantageous.

In addition, according to the present invention, the flow type washing system for purifying contaminated soil, since it is possible to effectively promote the desorption and decomposition of various contaminants from the contaminated soil and movement to the solvent by using ultrasonic vibration, is a solvent used for removing organic substances such as oil. It has the effect of reducing the amount of surfactant and acid / base, which are solvents used to treat heavy metals, and achieving removal efficiency equal to or higher than the acid / base effect even when a small amount of organic acid, which is a safer solvent than acid / base, is used. This is a great advantage in terms of worker safety and corrosion of the device.

In addition, according to the present invention, the flow type cleaning system for purifying contaminated soil, when the contaminated soil is low concentration, it is possible to achieve a large removal efficiency only by washing using only the washing water, the flow washing and the ultrasonic generator.

In addition, according to the present invention, the flow cleaning system for the purification of contaminated soil, the flow washing tank with ultrasonic generator is very excellent in the desorption effect of the contaminant from the contaminated soil, so as to remove the contaminants such as general contaminated soil, river sediment, marine dredging soil, etc. Soils containing more than 25% of clay, the limit of which can be applied economically and effectively.

Hereinafter, with reference to the accompanying drawings, the configuration of a fluid washing system for purifying contaminated soil according to the present invention will be described in detail.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be made based on the contents throughout the specification.

1 is a conceptual diagram showing the configuration of the soil-type soil washing system according to the present invention, Figure 2 is a conceptual diagram showing the configuration of a soil-type soil washing system according to another embodiment of the present invention, Figure 3 A perspective view showing the configuration of a fluid washing tank of a fluid washing system for purifying contaminated soil according to the present invention.

1 to 3, the contaminated soil cleaning system 100 according to the present invention includes a primary screen 110, a liquid washing tank 120, a blower 130, and a secondary screen 140. ), A coagulation tank 150, a precipitation tank 160, a cake maker 170, and a flow rate adjusting tank 180.

First, the primary screen 110 selects and discharges the excavated contaminated soil for each particle. At this time, the primary screen 110 is used to sort out and discharge foreign matters such as garbage and inclined screen or vibrating screen, it is preferable to use an inclined screen to reduce the installation cost. Here, the discharge side of the primary screen 110 is further provided with a first conveyor belt 111 for supplying the contaminated soil selected by the primary screen 110 to the fluid washing tank 120.

And, the fluid washing tank 120 is composed of a main body 121, an ultrasonic generator 123, a solvent input pipe 125, a washing water input pipe 127, and a water gauge 129 as shown in FIG. do.

The main body 121 is formed in a cylindrical shape of a metal material, and a lower end is formed in a conical shape, that is, the inside of the hollow cone shape, the inlet 121-1 is formed on the upper surface, the outlet 121-2 is formed on the side, Flow air supply port 121-3 is formed in the center of the bottom. Here, the discharge port 121-2 of the main body 121 is provided on the gate valve 121-4 for adjusting the discharge amount, and on the connection pipe 121-5 of the main body 121 and the blower 130 to be described below. A check valve 121-6 is further provided to block the washing water of the main body 121 from flowing back to the blower 130.

The ultrasonic generator 123 is formed at an interval of 40 to 60 cm in the height direction of the main body 121 and 30 to 50 cm in the circumferential direction of the main body so as to generate vibrations by generating high frequency ultrasonic waves into the main body 121. It is installed up to the height of the water gauge 129 to be described. At this time, it is preferable that a power supply means (not shown) for supplying power to the ultrasonic generator 123 and a switch (not shown) for turning on / off the operation of the ultrasonic generator. On the other hand, explaining the operation of the ultrasonic generator, the ultrasonic extraction technique is a technique that is mainly used for cleaning purposes, the study of solid samples, such as soil mainly in the extraction of precious metal minerals from expensive ores or analysis of heavy metal content in solid samples It has been applied as an extraction method for and it is known to have a great effect on the reduction of extraction time and the reduction of drug consumption, and can remove some of the heavy metals without the use of strong acid. Ultrasonic extraction technique can be defined as the treatment using ultrasound, it generates strong high frequency sound in liquid and causes physicochemical reaction with mixing, and creates and destroys countless micro bubbles in liquid. It is known to generate shock waves, which is called cavitation. Ultrasonic energy, on the other hand, does not work uniformly throughout the reactor. This is because only the closest ultrasonic generator in the total reaction solution exhibits a great cavitation effect, which is why the washing tank is made into a fluid. That is, by circulating the earth and sand mixture in the form of slurry mixed with soil and turbid liquid toward the ultrasonic generator 123 attached to the outside of the fluid washing tank 120 to maximize the ultrasonic contact efficiency, ultimately desorbs contaminants from the earth, In the process of separating, dissolving and moving to the mixed solution, the removal speed is greatly increased, so a large amount of contaminated soil can be processed quickly.

The solvent inlet tube 125 is installed and fixed on the upper surface of the body 121 so that the solvent is introduced. At this time, the solvent is an inorganic acid such as organic acid, hydrochloric acid and sulfuric acid, strong alkali, EDTA, ionic / nonionic surfactant, redox agent and the like, the user can select and use a solvent suitable for various contaminants as appropriate. In addition, the solvent is preferably replenished in proportion with the replenishment of the washing water.

The washing water input pipe 127 is installed and fixed on the upper surface of the main body 121 so that the washing water is introduced. Here, the washing water input pipe 127 is connected to the flow rate adjustment tank 180 and the first supply pipe 181 to be described below to receive the washing water from the flow rate adjustment tank 180 through the first pump 101, river water Or tap water is supplied through the replenishment duct 127-1 to be replenished with washing water. At this time, the replenishment pipe 128 is provided with a solenoid valve 127-3 for controlling the supply amount of river water or tap water as replenishment water.

The water level meter 129 controls the level of the turbid liquid mixed with the washing water and the solvent to be interlocked with the first pump 101 and the solenoid valve 127-3 to block the discharge through the inlet 121-1, and It is installed on the upper side of the inner body 121 to maintain the water level.

In addition, the blower 130 supplies the air for flow to the flow washing tank 120, installed higher than the installation position of the water gauge 129 of the flow washing tank 120 to block the turbidity of the inside of the main body 121 backflow do.

In addition, the secondary screen 140 selects and discharges the washing soil discharged from the fluidized washing tank 120 by particles as a vibrating screen. Here, the discharge side of the secondary screen 140 is further provided with a second conveyor belt 141 for discharging and loading the washing soil selected by the secondary screen 140.

On the other hand, the coagulation tank 150 agitates the turbidity and coagulant containing the unselected fine particles discharged from the secondary screen 140. Coagulant refers to a commonly used coagulant used for the purification of contaminated soil.

In addition, the precipitation tank 160 concentrates the contaminants by precipitating the turbid liquid containing the unselected fine particles and the flocculant discharged from the flocculation tank 150 for a long time. At this time, between the precipitation tank 160 and the flocculation tank 150 is connected to the first supply pipe 161 to supply a turbid liquid containing the unselected fine particles and flocculant discharged from the flocculation tank 150, It is preferable that the second pump 103 is installed on the second supply pipe 161, and the turbid liquid containing the unselected fine particles and the flocculant may be transferred using the drop of the precipitation tank 160 and the flocculation tank 150. It may be.

In addition, the cake maker 170 dehydrates the precipitated contaminants discharged from the settling tank 160 to manufacture and discharge the cake, and supplies the discharged washing water to the coagulation tank 150 through the third supply pipe 171. . Here, the cake maker 170 is any one of a belt press, a filter press, and a centrifuge. In addition, the third pump 105 is preferably used when supplying the washing water discharged from the cake maker 170 to the coagulation tank 150 through the third supply pipe 171.

In addition, the flow rate adjustment tank 180 receives the supernatant water (that is, the treated water whose turbidity is treated through the precipitation) of the settling tank 160 and re-injects it into the fluid washing tank 120. At this time, between the flow rate adjustment tank 180, the settling tank 160 is connected to the fourth supply line 183 so as to deliver the upper water of the flow rate adjustment tank 180, the fourth pump 107 on the fourth supply line (183). It is preferable to install.

On the other hand, when the clay content of the excavated contaminated soil is 25% or more, between the secondary screen 140 and the coagulation tank 150, as shown in FIG. 2, the unscreened fine discharged from the secondary screen 140 The auxiliary cake maker 190 is further installed to produce and discharge the particles into a cake, and supply the discharged washing water to the flocculation tank 150 through the fifth supply pipe 191. At this time, the auxiliary cake maker 190 is any one of a belt press, a filter press, a centrifuge. In addition, the fifth pump 109 is preferably used when supplying the washing water discharged from the auxiliary cake maker 190 to the coagulation tank 150 through the fifth supply pipe 191.

Hereinafter, described in detail with reference to the accompanying drawings, a flow washing method for purifying contaminated soil in accordance with the present invention.

Figure 4 is a flow chart for explaining a contaminated soil cleaning method according to the present invention, Figure 5 is a flow chart for explaining a contaminated soil cleaning method according to another embodiment of the present invention.

Referring to FIG. 4, first, in the case of the excavated contaminated soil, the primary screen 110 is screened to remove large stones or gravel, garbage (S110). At this time, when the soil is dropped on the primary screen 110 using an excavator, the soil is selected by sliding the soil by the inclination.

Then, the contaminated soil of particles having a predetermined size or less passing through the primary screen 110 is dropped into the first conveyor belt 111 and is introduced through the inlet 121-1 of the fluid washing tank 120 by a predetermined amount. At this time, the turbid liquid mixed with the washing water and the solvent is maintained in the fluid washing tank 120 maintains a constant water level, and the ultrasonic wave is supplied to the ultrasonic generator 123 to generate ultrasonic waves. The concentration is selected. In addition, the flow air is supplied through the air supply port 121-3 of the flow washing tank 120 by the blower 130, and the turbid liquid is circulated upwardly. In addition, the water level meter 129 detects the water level of the fluidized washing tank 120, and when the water level is lowered below the reference level, the first pump 101 and the solenoid valve 127-3 are controlled through the washing water input pipe 127. Allow the wash water to be replenished.

On the other hand, when the contaminated soil is introduced into the fluid washing tank 120, washing is performed by the turbid liquid and the ultrasonic wave while staying for a predetermined time (about 15 minutes). It is made (S120).

When the cleaning is completed, the user discharges the gate valve 121-4 to contaminated soil and turbid liquid in the fluid washing tank 120 to the secondary screen 140.

Then, the washing soil of particles having a predetermined size or more passed from the secondary screen 140 may be dropped into the second conveyor belt 141 and then loaded and recycled into a site refill or aggregate (S130). On the other hand, if the secondary screen 140 can adjust the screening particle diameter can be used to more effectively recycle the separated soil treated by particle diameter.

The turbid liquid containing the washing soil and contaminants of the fine particles that are not selected by the secondary screen 140 is discharged from the flocculation tank 150 to the settling tank 160 which is stirred for a predetermined time together with the flocculant (S140).

Meanwhile, the settling tank 160 concentrates the contaminants discharged from the flocculating tank 150 for a long time, concentrates them, and discharges them to the cake maker 170 (S150). At this time, the supernatant of the settling tank 160 is reused as the washing water after the transfer to the flow rate adjustment tank 180.

Then, the cake maker 170 dehydrates the washing soil and contaminants of the unselected fine particles, prepares the cake, and then discharges the cake (S160). At this time, the washing water discharged during the dehydration of the cake maker 170 is transferred to the coagulation tank 150 and reprocessed.

On the other hand, in the case of contaminated soil having a clay content of 25% or more, there is a problem that the treatment speed is relatively delayed because a lot of cakes are generated at the final disposal.

In order to solve this problem, in the present invention, as shown in FIG. 2, a secondary cake maker 190 is further installed between the secondary screen 140 and the coagulation tank 150, so that it is difficult to separate the secondary screen 140. The earth and sand of the particle size make a cake and discharge it first. That is, in the flocculation tank 150 and the precipitation tank 160, only the washing water containing a large amount of contaminants is treated, so that the generation amount of the high concentration contaminated cake is reduced.

This will be described in more detail with reference to FIG. 5 as follows.

First, in the case of the excavated contaminated soil, the primary screen 110 is screened to remove large stones or gravel, garbage (S210). At this time, when the soil is dropped on the primary screen 110 using an excavator, the soil is selected by sliding the soil by the inclination.

Then, the contaminated soil of particles having a predetermined size or less passing through the primary screen 110 is dropped into the first conveyor belt 111 and is introduced through the inlet 121-1 of the fluid washing tank 120 by a predetermined amount. At this time, the turbid liquid mixed with the washing water and the solvent is maintained in the fluid washing tank 120 maintains a constant water level, and the ultrasonic wave is supplied to the ultrasonic generator 123 to generate ultrasonic waves. The concentration is selected. In addition, the flow air is supplied through the air supply port 121-3 of the flow washing tank 120 by the blower 130, and the turbid liquid is circulated upwardly. In addition, the water level gauge 129 detects the water level of the fluidized washing tank 120 and controls the first pump 101 and the solenoid valve 127-3 when the water level is lowered below the reference level. Ensure that the wash water is replenished.

On the other hand, when the contaminated soil is introduced into the fluid washing tank 120, washing is performed by the turbid liquid and the ultrasonic wave while staying for a predetermined time (about 15 minutes). It is made (S220).

When the washing is completed, the user discharges the gate valve 121-4 to contaminated soil and suspension in the flow washing tank 120 to the secondary screen 140.

Then, the washing soil of particles having a predetermined size or more passed from the secondary screen 140 may be dropped into the second conveyor belt 141 and then stacked and recycled into a site refill or aggregate (S230). On the other hand, if the secondary screen 140 can adjust the screening particle diameter can be used to more effectively recycle the separated soil treated by particle diameter.

The turbid liquid containing the washing soil and contaminants of the microparticles not sorted on the secondary screen 140 is introduced into the auxiliary cake maker 190 to be made into a cake and discharged.

In addition, the turbid liquid is supplied to the coagulation tank 150 from the auxiliary cake maker 190 and discharged from the coagulation tank 150 to the settling tank 160 stirred with the coagulant for a predetermined time (S250).

On the other hand, the settling tank 160 is concentrated by depositing the contaminants discharged from the coagulation tank 150 for a long time and discharged to the cake maker 170 (S260). At this time, the supernatant of the settling tank 160 is reused as the washing water after the transfer to the flow rate adjustment tank 180.

Then, the cake maker 170 dehydrates the washing soil and contaminants of the unselected fine particles and prepares the cake and discharges it (S270). At this time, the washing water discharged during the dehydration of the cake maker 170 is transferred to the coagulation tank 150 and reprocessed.

Therefore, the present invention is used for the removal of organic matters such as oil by effectively promoting the desorption and decomposition of various contaminants from the soil and the transfer to the solvent by ultrasonic waves after the soil and turbidity is completely mixed by the flow air in the fluid washing tank. The amount of surfactant and the amount of acid / base used to treat heavy metals can be significantly reduced, and even a small amount of organic acid, which is a safer solvent besides acid / base, can achieve the same removal efficiency as that of the acid / base effect. . This is a great advantage in terms of worker safety and corrosion of the device.

In addition, in the case of low concentration of contaminated soil, it is possible to increase the efficiency of removing contaminants even by using only washing water.

As those skilled in the art would realize, the described embodiments may be modified in various ways, all without departing from the spirit or scope of the present invention. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.

The flow type washing system for purifying contaminated soil according to the present invention can be used not only for purifying contaminated soil but also for sorting and washing circulating aggregate.

1 is a conceptual diagram showing the configuration of a fluid washing system for purification of soil contamination according to the present invention;

Figure 2 is a conceptual diagram showing the configuration of a fluid washing system for purifying contaminated soil according to another embodiment of the present invention,

Figure 3 is a perspective view showing the configuration of the fluid washing tank of the fluid washing system for cleaning soil contamination according to the present invention,

Figure 4 is a process chart for explaining the fluid washing method for cleaning soil contamination according to the present invention,

Figure 5 is a process chart for explaining the contaminated soil cleaning method for cleaning the soil in accordance with another embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

110: primary screen 120: flow washing tank

130: blower 140: secondary screen

150: flocculation tank 160: sedimentation tank

170: cake maker 180: flow adjustment tank

190: Auxiliary Cake Maker

Claims (21)

A primary screen for sorting and discharging the excavated contaminated soil by particles; An inlet is formed on the upper surface of the screen, and the outlet is formed on the upper surface, and the outlet is formed on the upper surface to wash the selected contaminated soil discharged from the primary screen using washing water and solvent and flow air according to the type of contamination. A main body in which a flow air supply port is formed in the center of the bottom surface, an ultrasonic generator attached to the outer circumferential surface of the main body at equal intervals, a solvent inlet tube formed on the upper surface of the main body so that the solvent is introduced, and the washing water A fluid washing tank comprising a washing water input pipe formed on an upper surface of the main body; A blower for supplying flow air to the flow washing tank; A secondary screen for selecting and discharging the washing soil discharged from the flow washing tank for each particle; An agglomeration tank for stirring the washing water and the coagulant containing the unselected fine particles discharged from the secondary screen; A precipitation tank for concentrating the contaminants discharged from the flocculation tank for a long time and concentrating; A cake maker for dewatering contaminants discharged from the settling tank to be produced and discharged into a cake, and supplying the discharged contaminated water to the coagulation tank through a supply pipe; And And a flow rate adjustment tank for receiving the supernatant of the sedimentation tank and re-entering the flow washing tank. The method of claim 1, Between the primary screen and the fluid washing tank, And a first conveyor belt for supplying the contaminated soil selected by the primary screen to the flow washing tank. delete The method of claim 1, On the discharge side of the secondary screen, And a second conveyor belt for discharging and accumulating the washed soil selected by the secondary screen. delete The method of claim 1, When the clay content of the contaminated soil is 25% or more, between the secondary screen and the coagulation tank, It further comprises an auxiliary cake maker for preparing and discharging the unscreened fine particles discharged from the secondary screen as a cake, and supplying the discharged washing water to the flocculation tank through a supply pipe. . delete delete The method of claim 1, In the outlet of the main body, And a gate valve for controlling the discharge amount. The method of claim 1, On the connection pipe of the main body and the blower, And a check valve to prevent the washing water of the main body from flowing back to the blower. The method of claim 1, The washing water input pipe, The washing water is supplied through the pump from the flow rate adjustment tank, the river water or tap water is supplied through the supplemental conduit to replenish the wash water, and the supplemental conduit further comprises an electromagnetic valve for controlling the supply amount of the river water or the tap water. Liquid cleaning system for soil cleaning. delete delete The method of claim 11, The main body, Soil level purification for detecting the level of the wash water on the upper side of the inner side to block the water level of the turbid liquid mixed with the wash water and the solvent to be discharged through the inlet in conjunction with the pump and the solenoid valve Fluid cleaning system. The method of claim 14, The ultrasonic generator, 40 to 60 cm in the height direction of the main body, 30 to 50 cm in the circumferential direction of the main body is formed, the fluid washing system for polluted soil purification, characterized in that installed to the height of the water gauge. The method of claim 14, The blower, And a washing water of the main body is installed higher than the installation position of the water level gauge of the floating washing tank to block backflow of the main body to the blower. delete delete delete delete delete

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