KR100633111B1 - Soil washing device - Google Patents

Abstract

A soil cleaning apparatus to which a soil cleaning method for removing contaminants is applied to reduce a remediation period of contaminated soil and obtain superior remediation efficiency is provided. A soil cleaning apparatus(100) comprises: a cleaning tank(110) of which a lower portion has a hopper shape, and which has a cleaning solution discharge pipe(111) and a discharge valve formed at the center of a lower portion thereof to discharge a used cleaning solution; an agitator(120) comprising plural agitation vanes(122) installed vertically within the cleaning tank to agitate the cleaning solution and contaminated soil by an agitation motor(121); a nozzle part(130) comprising at least one nozzle(131) for spraying a cleaning solution received from an external storage tank into the cleaning tank; an injection hopper(140) installed at one side of an upper portion of the cleaning tank such that the injection hopper is in communication with an upper part of the cleaning tank to inject contaminated soil into the cleaning tank; an air ejecting equipment(150) that is connected to the periphery of a lower portion of the cleaning tank and comprises a blower, a central pipe and plural connecting pipes(153); and a transfer equipment(160) comprising a discharge pipe(161) having a clay discharge mesh(163) and a treated soil discharge path(164) formed at one side thereof, and a transfer conveyor for transferring upward treated soil along a length direction of the discharge pipe by a transfer motor(165).

Description

Soil washing device

1 is a cross-sectional view showing a soil washing apparatus according to an embodiment of the present invention,

FIG. 2 is a perspective view showing an air jet value shown in FIG. 1;

3 is a perspective view showing the stirrer shown in FIG.

4 is a cross-sectional view showing another embodiment of the conveying conveyor shown in FIG.

<Explanation of symbols for the main parts of the drawings>

100 Soil cleaning unit 110 Wash bath

111 ... cleaning liquid discharge pipe 112 ... discharge valve

120 agitator 121 agitator motor

122 ... Stirring wing 130 ...

131 Nozzle 140 Feeding Hopper

141 ... vibration screen 150 ... air jet

151 blower 152 central piping

153 connector 160 ... transfer

161 Discharge pipe 162 Transfer conveyor

163 ... clay discharge network 164 ... treatment earth discharge furnace

The present invention relates to a soil washing apparatus, and more particularly, to a soil washing apparatus for discharging contaminated soil by reacting contaminated soil with a washing liquid to purify contaminated soil and then discharging the treated soil.

Soil pollution, as defined by the current Soil Environment Conservation Act, refers to a condition that damages human health or the environment by increasing the concentration of certain chemicals in soil due to business activities or human activities. It means the phenomenon that the soil, which is the final result of the environment due to high development, is polluted by various harmful substances.

Most of the pollutants that cause such soil pollution is introduced into the soil through the air or water paths from the pollutant discharge source, or the leachate from the landfill and the poisonous material from the toxic storage facility leak into the soil.

The contaminated soil can be a source of water pollution and air pollution, including groundwater contamination, crop and tree growth disturbances, and adverse effects on soils and ecosystems, which can cause serious threats to the ecosystem.

 In addition, the pollutants that are the source of soil pollution are slow in their movement and delivery, which can be costly and time-consuming to recover if the soil is not restored once contaminated. Therefore, it is desirable that contaminated soil be cleaned in a timely manner.

The technology for purifying contaminated soil is divided into in-situ treatment in contaminated soil and Ex-situ treatment in out-of-contaminated soil. Here, the ex-situ method is divided into an on-site method for treating on contaminated soil site and an off-site method for transporting contaminated soil in a separate site.

In Korea, the land use rate is high, so it is highly economical to purify the contaminated soil within a short time and reuse the land. The Ex-situ method has a shorter purification treatment period and an excellent purification efficiency than the In-situ method.

Such ex-situ methods include incineration, thermal desorption, soil washing, solidification / stabilization, and bioreaction. The incineration and thermal desorption methods have superior purification efficiency but higher energy treatment costs than other purification techniques. It is consumed, and incineration, in particular, has the disadvantage that the inherent properties of the soil are lost.

In addition, the solidification / stabilization method is expensive and difficult to apply in a large area of contaminated sites, bioreaction method is difficult to identify and quantify the treatment effect, there is a fear that harmful secondary products are generated, The disadvantage is that suitable environmental conditions such as humidity, hydrogen ion concentration (pH), etc. must be established.

On the other hand, the soil washing method has the advantage that it is possible to purify the soil for a short period of time, as well as to recycle the treated soil, considering the soil environment in Korea.

The present invention has been made to solve the above-mentioned problems, the object of the present invention is to provide a soil washing apparatus having a high purification efficiency and a shortened treatment period of polluted soil by applying a soil washing method to remove pollutants.

Other objects and advantages of the invention will be described below and will be appreciated by the embodiments of the invention. Furthermore, the objects and advantages of the present invention can be realized by means and combinations indicated in the claims.

The soil washing apparatus of the present invention for achieving the above object is a space in which the contaminated soil is purified while the contaminated soil and the washing liquid are mixed with each other, the lower portion has a hopper shape, and the used washing liquid is discharged at the lower center. A washing tank provided with a washing liquid discharge pipe and a discharge valve for the washing liquid; A stirrer installed vertically in the washing tank, the stirrer having a plurality of stirring vanes for mutually stirring the washing liquid and the contaminated soil by a stirring motor; A nozzle unit having at least one nozzle for spraying the washing liquid supplied from an external storage tank into the washing tank; An input hopper extending upwardly in an open state at an upper side of the upper side of the washing tank so as to communicate with an upper portion of the washing tank to inject contaminated soil into the washing tank; An air spraying device coupled through a circumference of the lower portion of the washing tank to supply air into the washing tank to increase washing efficiency according to stirring of the contaminated soil; And a transfer device extending from one side of the washing tank to the outside to transfer the treated soil, which is washed soil, to be discharged to the outside.

In addition, the input hopper may include a vibrating screen that is dropped into the washing tank while separating the contaminated soil introduced from the upper side as a plate formed with a sieve network mounted to cross the inside with vibration.

In addition, the air injection device is a blower for sucking and discharging air; A central pipe connected to the blower and having a central valve for controlling the inflow and discharge of air discharged from the blower; And a plurality of connection pipes connected to the lower circumferential direction of the washing tank in the state in which each of the central pipes are distributed, and having respective valves to inject air passing through the central pipe into the washing tank.

In addition, the transfer apparatus, the discharge pipe extending from the one side of the washing tank to a predetermined slope toward the outside, one side is provided with a clay discharge network and the treated soil discharge path; And a conveyance conveyor configured to extend the longitudinally toward the inside of the discharge pipe in a state where one end is included inside the washing tank, and to transfer the cleaned soil treated soil to a upward direction along the longitudinal direction of the discharge pipe by a transfer motor. It is preferable to include.

In addition, the transfer conveyor may be a screw conveyor.

The conveying conveyor may be a belt conveyor having a plurality of perforated networks.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. It should be interpreted as meanings and concepts corresponding to the technical idea of the present invention based on the principle of definition.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is a cross-sectional view showing a soil washing apparatus according to an embodiment of the present invention, Figure 2 is a perspective view showing the air spraying device shown in Figure 1, Figure 3 is a perspective view showing the agitator shown in Figure 1.

As shown, the soil washing apparatus 100 of the present invention is the washing tank 110, the stirrer 120, the nozzle unit 130, the injection hopper 140, the air spraying device 150 and the transfer device 160 Include.

The washing tank 110 is a space in which the contaminated soil is purified while the contaminated soil and the washing solution are mixed with each other.

The lower portion of the washing tank 110 has a hopper shape that the cross-sectional area is reduced toward the lower side, and the washing liquid discharge pipe 111 and the cleaning liquid discharge pipe 111 extended to the outside to discharge the used cleaning liquid in the lower center, Discharge valve 112 for controlling the discharge and the presence of the cleaning liquid is provided.

The washing liquid discharged to the washing liquid discharge pipe 111 may be recycled by re-inserting the washing liquid in a separate sedimentation tank (not shown) and removing the precipitate. This recycled wash solution may be mixed with fresh wash solution and added.

By recycling the cleaning solution as described above there is an advantage that can prevent secondary environmental pollution and reduce the purification treatment cost.

The stirrer 120 is installed vertically in the washing tank 110 to mutually stir the washing liquid and the contaminated soil added to the washing tank 110 to physically desorb and remove contaminants contained in the contaminated soil, and the stirring motor 121. It is provided with a plurality of stirring blades 122 and the stirring shaft 123 driven by.

Each of the stirring blades 122 is preferably reduced in diameter toward the lower portion of the stirring shaft 123 so as to correspond to the hopper shape of the lower portion of the washing tank (110).

As shown in FIG. 3, the stirring blade 122 may be installed in three stages in the longitudinal direction of the stirring shaft 123, but the number of stages of the stirring blade 122 is not limited thereto.

On the other hand, each of the stirring blades 122 may be disposed so as to shift a predetermined angle along the circumferential direction of the stirring shaft 123 and the other stirring blade 122 located on the upper or lower for stirring efficiency.

The shape of the stirring blade 122 provided in the stirrer 120 is not limited to the form shown in Figure 3, it may be modified in various ways.

On the other hand, the stirring motor 121 is preferably connected to an external stirring control device (not shown) to adjust the stirring speed and time.

The nozzle unit 130 receives the washing solution from the external storage tank 132 in which the washing solution is stored by the transfer pipe 133 and sprays the washing solution into the washing tank 110, and at least one nozzle 131. It may be installed on the upper portion of the washing tank 110 in this state.

It is to be understood that the configuration and shape of the nozzle unit 130 is not limited to that shown in FIG. 1 or 4, but may be modified in more various forms.

The input hopper 140 is a portion for injecting contaminated soil into the washing tank 110 is extended upwardly in the upper and lower portions in an open state on the upper side of the washing tank 110 to communicate with the upper portion of the washing tank 110.

The inside of the input hopper 140 may be provided with a vibration screen 141 for separating the contaminated soil introduced from the upper by vibration to fall into the washing tank 110.

The vibrating screen 141 is a plate formed with a sieve (not shown), mounted horizontally or inclined as shown in Figure 1 so as to cross the interior of the input hopper 140. Can be.

The vibrating screen 141 separates the contaminated soil introduced by the driving of the vibration motor (not shown) into vibrations, and the separated contaminated soil may fall into the washing tank 110 while passing through a sieve network (not shown). Can be.

When the contaminated soil is separated and introduced by the vibrating screen 141 as described above, the surface area in contact with the cleaning liquid is widened while the contaminated soil is washed in the washing tank 110, thereby improving the purification efficiency for contaminants. have.

Meanwhile, as shown in FIGS. 1 and 2, the air spraying device 150 is coupled through the circumference of the lower portion of the washing tank 110 to supply air into the washing tank 110 to stir contaminated soil with the washing liquid. As part of enhancing the cleaning efficiency of the contaminated soil, the blower 151, the central pipe 152, and the plurality of connection pipes 153 are provided.

Here, the blower 151 is a part which sucks air from the outside and discharges it to the central pipe 152.

The central pipe 152 is connected to the blower 151 to pass the air discharged from the blower 151, and has a central valve 154 for controlling the inlet and discharge of the incoming air.

The connecting pipe 153 is a plurality of pipes connected to the lower circumferential direction of the washing tank 110 in a state in which each is distributed in the central pipe 152, the air passing through the central pipe 152 to the washing tank Inject to (110).

Each of the connection pipes 153 is provided with a respective valve 155 may be individually controlled the inlet and outlet of the air.

In addition, an end of the connecting pipe 153 connected to the washing tank 110 may be provided with an air spreader (sparger) for adjusting the size of the injected air.

On the other hand, a plurality of the connection pipe 153 may be connected to a total of four around the lower portion of the washing tank 110, as shown in Figure 2, the connection number of the connection pipe 153 is not limited to this, washing efficiency In order to improve the distribution in a larger number in the central pipe 152 may be connected to the washing tank (110).

In addition, the air spraying device 150 may be in the form of the central pipe 152 is fixed to the outside of the washing tank 110, as shown in Figure 2 may be implemented without a separate fixing. . In addition, the form in which the air spraying device 150 is fixed is not limited to the form shown in FIG. 2, and may be modified in more various forms.

As air is introduced into the washing tank 110 by the air spraying device 150, particle dispersion of contaminated soil is increased by bubbles of air injected while the contaminated soil and the washing liquid are stirred by the stirrer 120. As a result, the contact efficiency between the washing liquid and the contaminated soil is increased, thereby improving the removal efficiency of the pollutants and shortening the purification treatment period.

According to the soil washing apparatus 100 using the air spraying device 150, the stirrer 120 and the cleaning liquid, it is possible to clean and clean heavy metal contaminated soil, organic contaminated soil, mine tailings, river sediment, etc. Do.

On the other hand, the amount of air injected into the washing tank 110 is preferably controlled by using the central valve 154 and each of the valves 155 according to the soil soil, the characteristic and concentration of the washing liquid.

In addition, the blower 151 may be mutually separable from the central valve 152 and may supply air while being connected to the central valve 152 by a wire (not shown).

The transfer device 160 extends from one side in the washing tank 110 to the outside, and transfers the treated soil, which is washed soil, to be discharged to the outside, and includes a discharge pipe 161 and a transfer conveyor 162.

The discharge pipe 161 is a portion extending from the one side of the washing tank 110 to the outside at a predetermined slope toward the outside, on one side the clay discharge network 163 and the clay discharge network to discharge the clay of the mucus contained in the treated soil Located on one side of the upper portion 163 is provided with a treated soil discharge path 164 is discharged.

In addition, the transfer conveyor 162 is installed in one end is included in the inner lower end of the washing tank 110 in the other end extending in the longitudinal direction toward the discharge pipe 161, and transports the treated soil, which is washed soil. The motor 165 is a portion that is conveyed upward along the longitudinal direction of the discharge pipe 161.

By the transfer conveyor 162, while the treated soil is purified in the washing tank 110, the contaminants are desorbed and removed, the treated soil can be separated from the washing liquid, the clay contained in the treated soil is transferred to the clay Collected in a separate clay collection tank 166 through the discharge network 163, the treated soil is discharged directly through the treated soil discharge path (164).

The transfer conveyor 162 may be a screw conveyor as shown in FIG. 1, and may also be a belt conveyor as shown in FIG. 4.

4 is a cross-sectional view showing another embodiment of the conveying conveyor shown in FIG.

As shown in FIG. 4, when the transfer conveyor 162 is a belt conveyor, it is preferable that a plurality of perforated networks 167 penetrate upper and lower surfaces of the belt conveyor.

Therefore, while the treated soil is transported through the upper end of the belt conveyor longitudinal direction, the clay contained in the treated soil is discharged to the lower end of the belt conveyor through the perforated network 167 through the clay discharge network 163 Filtration and dropping, and the treated soil is discharged to the soil surface through the treated soil discharge path (164).

On the other hand, the conveying conveyor 162 is preferably connected to an external conveying control device (not shown) to adjust the feed rate and time.

 Referring to Figures 1 to 4 the operation of the soil washing apparatus 100 configured as described above in detail as follows.

Contaminated soil is introduced into the washing tank 110 through the feeding hopper 140, and the washing liquid is introduced into the washing tank 110 through the nozzle unit 130.

The contaminated soil and the washing liquid introduced into the washing tank 110 are agitated by the stirrer 120 to remove and remove the contaminants contained in the contaminated soil by physical and chemical actions.

At this time, while the air is injected into the lower circumference of the washing tank 110 through the air spraying device 150 installed around the lower portion of the washing tank 110, the contaminant desorption removal effect of the contaminated soil by the stirring operation of the stirrer 120. Is increased.

The treated soil in which the contaminants are desorbed and removed by the stirrer 120 and the air spraying device 150 in the washing tank 110 is separated from the washing liquid while being transferred to the outside by the transfer conveyor 162. During transport, the clay contained in the treated soil is filtered by the clay discharge network 163 and collected into a separate clay collection tank 166, and the treated clay is removed from the soil surface through the treated soil discharge passage 164. Drain directly into the phase.

After the discharge of the treated soil is completed, the used washing liquid is discharged through the washing liquid discharge pipe 111. The discharged washing solution may be recycled by remaining in a separate settling tank to remove the sediment containing desorbed contaminants and then re-inserting the washing liquid into the washing tank 110 through the nozzle unit 130.

On the other hand, since the soil washing apparatus 100 according to the present invention is manufactured in a small size, the soil washing apparatus 100 can move to a state mounted on a vehicle, and thus has excellent mobility to a contaminated site. This reduces the cost of transporting contaminated soil.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is described by the person of ordinary skill in the art to which the present invention pertains. Various modifications and variations are possible without departing from the scope of the appended claims.

According to the soil washing apparatus according to the present invention provides the following effects.

First, since the soil is purified by the washing method, the purification efficiency is excellent, and by recycling the washing liquid, it is possible to prevent environmental pollution and reduce the purification treatment cost.

Second, the particle dispersion of the contaminated soil is increased by the air bubbles injected by injecting air into the washing tank while stirring the contaminated soil and the washing liquid by the stirrer, thereby removing the contaminants contained in the contaminated soil and purifying the contaminated soil. It is excellent and provides the effect of shortening the purification treatment period.

Third, because it is manufactured in a small size, it is possible to move in a state mounted on a vehicle, so it is excellent in mobility to a contaminated site.

Claims (6)

A contaminated soil to be purified while the contaminated soil and the washing liquid are mixed with each other, the lower portion having a hopper shape, and a washing tank having a washing liquid discharge pipe and a discharge valve for discharging the used washing liquid in the lower center; A stirrer installed vertically in the washing tank, the stirrer having a plurality of stirring vanes for mutually stirring the washing liquid and the contaminated soil by a stirring motor; A nozzle unit having at least one nozzle for spraying the washing liquid supplied from an external storage tank into the washing tank; An input hopper extending upwardly in an open state at an upper side of the upper side of the washing tank so as to communicate with an upper portion of the washing tank to inject contaminated soil into the washing tank; The blower is coupled through the circumference of the lower portion of the washing tank to supply air into the washing tank to enhance the washing efficiency according to the stirring of the contaminated soil, and a blower that sucks and discharges the air, and connects the blower to the air discharged from the blower. A central pipe having a central valve for controlling ingress and discharge, and each valve connected to the lower circumferential direction of the washing tank in a state in which the central pipe is distributed in the central pipe, respectively, and the inlet and discharge of air are individually controlled; An air injection device including a plurality of connection pipes for injecting air passing through the central pipe into the washing tank; And One side of the washing tank extends upward from the one side of the washing tank to be discharged to the outside by transporting the treated soil, which is washed to the outside, and discharged to the outside. The other end portion is installed in the discharge pipe, and one end is included in the inside of the washing tank extending in the longitudinal direction toward the inside of the discharge pipe to convey the treated soil, which is washed contaminated soil upwards along the longitudinal direction of the discharge pipe by a transfer motor Soil washing apparatus comprising a conveying device having a conveying conveyor. The method of claim 1, wherein the input hopper, Soil washing apparatus characterized in that it comprises a vibrating screen to fall into the washing tank while separating the soil contaminated from the top as a plate formed with a sieve network mounted to cross the inside with vibration. delete delete According to claim 1, The conveying conveyor, Soil washing apparatus, characterized in that the screw conveyor. According to claim 1, The conveying conveyor, Soil washing apparatus, characterized in that the belt conveyor formed with a plurality of perforated network.

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