KR101533615B1 - Upward flow type gravity separator and heavy metal contaminated soil washing plant using the same - Google Patents

Abstract

The present invention relates to a specific gravity separator (10) which is installed on an apparatus for washing heavy metal-contaminated soil and purifying the same, and which separates heavy metal-contaminated particles in soil from soil particles, and to a washing apparatus using the specific gravity separator (10). The specific gravity separator (10) comprises a standing, main pipe (11) which has an inclined inlet pipe (12) connected to one side surface thereof, a conveying pipe (13) connected to the other side surface thereof at a lower position of a connection part of the inclined inlet pipe (12) and the main pipe (11), an overflow portion (14) connected to an outlet pipe (15) on an upper end thereof, and a collection pipe (16) formed on a lower end thereof, wherein suspension of soil to be separated is introduced to the inlet pipe (12), and simultaneously, wash water is conveyed to the conveying pipe (13) such that while the suspension and the wash water are mixed in the main pipe (11), heavy metal-contaminated particles are dropped and collected into the collection pipe (16) to be discharged, and soil particles which have relatively low specific gravity rise with upflow wash water to be discharged through the outlet pipe (15) of the outflow portion (14). Also, when the specific gravity separator (10) is installed on an apparatus for washing heavy metal-contaminated soil, the outlet pipe (15) of the specific gravity separator (10) is directly connected to the inlet pipe (12) of the other specific gravity separator (10) by applying a multi-stage method, and conveying pipes (13) of multiple specific gravity separators (10) are determined to have different flow rates of wash water from each other. According to the present invention, the treatment efficiency of an apparatus for washing heavy metal-contaminated soil can be improved, and removal efficiency of heavy metal in contaminated soil can be significantly improved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upflow type specific gravity separator and a heavy metal contaminated soil cleaning apparatus using the same,

The present invention relates to a washing facility to which a specific gravity sorter (10) and a non-gravity sorter (10) are applied for separating heavy metal contaminated particles and soil particles in a soil subject to be treated, A sloped inlet pipe 12 is connected to one side of the standing main pipe 11 and a pressure feeding pipe 13 is connected to the other side of the main pipe 11 below the sloped inlet pipe 12, A collecting pipe 16 is formed at the lower end of the main pipe 11 and a suspension of the soil to be treated flows into the inlet pipe 12 The washing water is fed to the pressure feeding pipe 13 and mixed with the main pipe 11. The heavy metal contaminant particles descend and are collected and discharged to the collecting pipe 16 and the relatively low specific gravity of the soil water flows upward of the washing water And can flow out to the outflow pipe 15 of the ridge portion 14 It is a lock.

When installing the gravity screening apparatus 10 in a heavy metal contaminated soil washing facility, the outlet pipe 15 of the gravity screening apparatus 10 is directly connected to the inlet pipe 12 of the gravity screening apparatus 10, And the flow rates of the washing water in the pressure feeding pipe 13 of the multiple specific gravity separators 10 are set differently.

The purification treatment of soils contaminated by various pollutants such as heavy metals can be divided into on-site treatment and off-site treatment depending on whether the contaminated soil is transported. Normally, on-site treatment is performed by adding treatment agent to the contaminated area, And a method of introducing a reaction inducing method, and the off-site treatment is a method of collecting contaminated soil and purifying it through a treatment facility such as a soil washing facility.

The soil washing, which is a representative method among the off-site treatment methods, refers to a treatment for separating and removing pollutants such as oil by washing the soil particles constituting the soil through the washing water as in the dictionary meaning. A particle washing machine, such as a drum washer, a plurality of particle size separators 52, a solid-liquid separator 54, and a water treatment facility 60, as shown in FIG.

1, the particle size sorter 52 is used to remove contaminated soil by washing the soil with pressurized water, vibration, rotation and agitation, passing the screen through a screen, In the apparatus for separating particles and washing water, the soil particles constituting the soil to be treated are separated by particle size, and the washing water discharged in this process passes through the solid-liquid separator 54 such as hydrocyclone to separate the fine particle, The biochemical reaction tank and the flocculation treatment tank are combined and sent to the water treatment facility 60 for purification treatment, and the purified water is reused or discharged.

As described above, various organic contaminants such as oil deposited on the soil particles can be separated and removed through a soil washing facility composed of a plurality of particle size sorters 52, a solid-liquid separator 54, and a water treatment facility 60, Open Patent Publication No. 2007-100214.

In the conventional soil washing facility including the patent publication No. 2007-100214, the soil particles constituting the soil to be treated are classified according to the particle size, the contaminants deposited in the soil particles are washed and separated, and the water is purified through the water treatment facility 60 The soil is basically separated from the liquid phase to the semi-liquid phase such as oil and the like, which is basically a solid material, and this is carried out based on classification of the particle size of the soil particles, and the soil contaminated by particulate solid contaminants such as heavy metals There is a problem in that the treatment efficiency is insufficient.

That is, the pollutants to be treated in the conventional soil washing facility may be non-solid organic pollutants such as oil, livestock waste or landfill leachate. In the conventional soil washing facility, pollutants deposited on the soil particles are washed and separated, Cleaning effluent containing contaminants is purified through a conventional water treatment facility 60 and there is no means to classify high particulate solid particulate contaminants such as heavy metals into normal soil particles, A large amount of heavy metal will be left in the finished washed soil.

Particularly, heavy metals are not only decomposable in nature but also have a bad influence on the ecosystem, but in the conventional soil washing facilities, no significant treatment effect could be expected.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a specific gravity sorter for cleaning contaminated soil that separates high-boiled pollution particles and low-specific-gravity pollution particles from each other, the slope inlet pipe 12 being provided at one side of the standing- A feed pipe 13 is connected to the other side of the main pipe 11 on the lower side of the junction of the slant inlet pipe 12 and a rim portion 14 connected to the outlet pipe 15 is connected to the upper and lower ends of the main pipe 11, The slurry of the soil gypsum to be treated flows into the inflow pipe 12 while the washing water is fed to the pressure feeding pipe 13 to be mixed with the mixed water in the main pipe 11, And the low specific gravity soil particles rise together with the upward flow of the washing water and flow out to the outflow pipe (15) of the sweeping part (14), characterized in that the upward specific gravity It is a sorting device.

The reflux pipe 41 is connected to the lower end of the collecting pipe 16 and the branch pipe 42 branched to the side is formed in the reflux pipe 41. The lower end of the reflux pipe 41 and the branch pipe 42 and a reflux valve 43 are mounted on the ends of the reflux pipe 41. An inclined perforated plate 44 is provided in the reflux pipe 41 in an inclined direction of the central axis of the reflux pipe 41, The lower end of the stencil 44 is positioned at the lower end of the junction of the reflux pipe 41 of the branch pipe 42 and the reflux valve 43 is closed and when the discharge valve 31 is opened, The excessive contaminant particle impurities in the contaminant suspension are trapped by the inclined perforated plate 44 and the discharge valve 31 is closed and the return valve 43 is opened, 43, and an excessive particle diameter impurity trapped in the inclined perforated plate 44 is discharged.

In the heavy metal contaminated soil washing facility equipped with the above-mentioned specific gravity sorting device 10, a plurality of particle size sorters 52, a solid-liquid separator 54 and a water treatment equipment 60 are installed in the washing facility, And the inlet pipe 12 of the other side gravity sorter 10 is connected to the outlet pipe 15 of the one side gravity sorter 10 so as to be installed in multiple stages and the one side gravity sorter 10, Liquid separator 54 or the solid-liquid separator 54 is adjusted so that the washing water flow rate in the pressure-feeding pipe 13 of the other side-specific gravity separator 10 is adjusted differently from the washing water- , And then flows into the multi-stage non-gravity separator (10) such that the one-side gravity separator (10) and the other side gravity separator (10) are sequentially passed through to treat the heavy metal contaminated soil.

Through the present invention, it is possible to enhance the treatment efficiency of the contaminated soil washing facility and to remarkably improve the removal efficiency of heavy metals in the contaminated soil.

Particularly, the contaminants to be separated can be selected by controlling the flow rate of washing water fed to the specific gravity separator 10. By configuring the specific gravity separator 10 in multiple stages, it is possible to effectively separate and remove heavy metal contaminants have.

In addition, the reflux pipe 41 having the inclined perforated plate 44 is installed at the lower end of the specific gravity separator 10, thereby effectively separating impurities of excessive particle diameters that can be inevitably incorporated during the operation of the cleaning facility .

FIG. 1 is a schematic diagram of a conventional soil washing apparatus.
FIG. 2 is a schematic view of an embodiment of a soil washing facility of the present invention
Fig. 3 is a perspective view of a specific gravity separator of the present invention
FIG. 4 is a cross-sectional view of the non-
5 is a perspective view of an apparatus for selecting a specific gravity of a reflux pipe and a point spreader according to the present invention.
Figure 6 is a cross-sectional view of the operating state of Figure 5 embodiment
FIG. 7 is a perspective view of a multi-stage installation state of the non-

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, the contaminated soil washing apparatus to which the present invention is applied is a constitutional view showing a contaminated soil washing apparatus to which the present invention is applied. A solid particle separator 54 such as a hydrocyclone for solid-liquid separation of the mixed solution of the washing water and the soil particles, A dehydrator 53 such as a screw decanter for dewatering waste in a wet state, and a water treatment facility 60 for purifying waste water through physical treatment and biochemical treatment.

3 is a perspective view showing the outer appearance of the specific gravity separator 10 of the present invention. As shown in the figure, the specific gravity separator 10 of the present invention has a sloped inlet pipe 12 A feed pipe 13 is connected to the other side of the main pipe 11 at the lower side of the junction of the slant inlet pipe 12 and the upper and lower ends of the main pipe 11 are connected to a ridge 14 and a collecting pipe 16 whose diameter gradually decreases downward.

The discharge pipe 31 is connected to the discharge port at the lower end of the collecting pipe 16 to open and close the collecting pipe 16.

The main pipe 11 constituting the specific gravity separator 10 of the present invention is a pipe having upper and lower ends opened and has a sweeping part 14 and a collecting pipe 16 at the upper and lower ends, The slope inlet pipe 12 and the pressure feeding pipe 13, which are relatively small diameter pipes, are laterally connected and connected to each other in a manner such as a flange connection or the like as in the illustrated embodiment.

4, the central axis of the inflow pipe 12, which is connected to the main pipe 11 in an oblique direction, is inclined with respect to the central axis of the main pipe 11. The lower end of the inflow pipe 12 is connected to the main pipe 11 And a pressure feeding pipe 13 connected to the main pipe 11 is installed so that the connecting portion is located below the joining portion between the inlet pipe 12 and the main pipe 11. [

Therefore, the suspension of the soil to be treated flows into the inlet pipe 12 in an oblique direction, and the washing water is fed to the feeding pipe 13 by the feeding pump 21 connected to the feeding pipe 13, The high specific gravity particles are lowered to the collecting pipe 16 while the low specific gravity particles are elevated together with the upward flow of the washing water to flow into the outflow pipe 14 15).

That is, when the discharge valve 31 at the lower end of the collecting pipe 16 is closed, the washing water fed from the feeding pump 21 is injected into the main pipe 11 through the feeding pipe 13, The diameter of the collecting tube 16 below the main tube 11 is gradually reduced downward and the area of the internal tube end is also gradually reduced even when the discharge valve 31 is opened, Most of the washing water injected into the main pipe 11 through the feed pipe 13 rises in the main pipe 11 to form an upward flow.

The upward flow thus formed forms a mixed section within the main pipe 11 with the suspended slurry of the soil to be treated which slopes into the main pipe 11. In this process, relatively high particulate solid particulate contaminants The normal ground particles having a relatively low specific gravity settles and flows out from the upper ridge portion 14 of the main pipe 11 through the outflow pipe 15 while being floated together with the upward flow.

The criterion for separating the high-boiling pollutant and the low-specific-gravity pollutant separated through the specific gravity separator 10 may be a flow of upward flow formed in the main pipe 11, It is possible to adjust the flow rate by changing the flow rate of the upward flow by operating the pressure feeding pump 21 according to the characteristics of the heavy metal contaminant to be separated, that is, the kind and fineness of the heavy metal, etc. Do.

The mixed-up period and the upward flow formation of the non-specific gravity separator 10 of the present invention and the floating action of the normal ground particles through the above-described non-concentrator 50 are fundamentally different from those of the conventional swirl flow type solid-liquid separator 54 such as hydrocyclone The hydrocyclone is a device for separating the fluid from the solid by swirling flow and gravity. It is limited to overcome the gravity and float the soil particles. The soil particles and heavy metal contaminants are treated as solids and the fluid is separated , The gravity sorter (10) of the present invention can overcome the gravity and float the ground grains by forming an artificial upward flow, as well as float by adjusting the upward flow velocity by operating the pressure feeding pump (21) The specific gravity of the solids can be freely controlled.

Also, the specific gravity sorting device 10 of the present invention is fundamentally different from the wind power sorting device or the air flow sorting device used for sorting household garbage. In the wind and air sorting method, the objects are horizontally scattered, It is impossible to classify the particles by the difference in dropping or sedimentation distance under the condition that the washing water flows radially in the narrow space of the pipe. Therefore, as the application of the wind power and air flow sorting method, The function and effect peculiar to the device 10 can not be achieved.

5 and 6 show an embodiment in which the operation stability and the maintenance convenience of the non-specific gravity separator 10 according to the present invention are maximized. A reflux pipe 41 is provided at the lower end of the collecting pipe 16 of the non- And a point expanding pipe 46 and a point pipe 47 are connected between the pressure feeding pipe 21 and the pressure feeding pipe 13. [

6, the reflux pipe 41 is provided with an inclined perforated plate 41 in the inside of the reflux pipe 41, as in the enlarged portion in the ellipse of Fig. 6, The inclined perforated plate 44 smoothly passes the contaminant suspension through the inclined perforated plate 44 to trap excessive particle diameter impurities and prevents inflow of excessive particle diameter impurities in the piping of the washing facility, The excessive particle diameter impurities trapped in the inclined perforated plate 44 can be discharged to the outside of the specific gravity separator 10 during the drainage process through the branch pipe 42 branched to the return pipe 41. [

5 and 6, a reflux pipe 41 is connected to the lower end of the collecting pipe 16 of the specific gravity separator 10, and a branch pipe 42 branched laterally is connected to the reflux pipe 41 A discharge valve 31 and a reflux valve 43 are mounted on the lower end of the reflux pipe 41 and the distal end of the branch pipe 42, The lower end of the inclined perforated plate 44 is located at the lower end of the junction of the reflux pipe 41 of the branch pipe 42. [

When the reflux valve 43 is closed and the discharge valve 31 is opened, the pollutant suspension passes through the inclined perforated plate 44 Excessive particle diameter impurities in the contaminant suspension are trapped in the inclined perforated plate 44 while the discharge valve 31 is closed and the return valve 43 is opened while being discharged to the discharge valve 31. The contaminant suspension is returned to the return valve 43 The excessive inclusion particle impurity trapped in the inclined perforated plate 44 is discharged along with the inclined perforated plate 44, thereby effectively blocking the inflow of excessive particle diameter impurities such as various impurities into the washing equipment duct, thereby preventing the duct from being obstructed and damaged in advance , It is possible to easily remove the impurities without disassembling the entire apparatus or without stopping the operation for a long time even in the maintenance of the specific gravity separator 10.

5 and 6, the discharge port of the pressure feeding pump 21 is connected to the point transmission pipe 47 of the specific gravity separator 10 of the present invention. A point tube 47 is connected to the outlet end of the point expanding pipe 46 and an outlet end of the point pipe 47 is connected to the pressure feeding pipe 13.

As in the dictionary meaning, the point expanding pipe 46 and the point pipe 47 are tubular members whose cross-sectional area gradually increases or decreases in the flow direction of the fluid. As shown in Fig. 6, The washing water can be temporarily stored while passing through the point expanding pipe 46 and the point storing pipe 47 and thereby the flow rate and pressure of the washing water injected into the main pipe 11 through the pressure feeding pipe 13 can be stabilized .

As shown in FIG. 2, the specific gravity sorter 10 of the present invention is configured in a heavy metal contaminated soil washing apparatus. In this case, the single gravity sorter 10 is not individually connected to other processing apparatuses, The sorting apparatus 10 is directly connected and combined in multiple stages to constitute one set of multi-stage gravity screening apparatus 10, and the multi-stage gravity screening apparatus 10 is installed in such a manner as to be connected to other processing apparatuses.

Here, direct connection between the non-specific gravity sorting devices 10 means that a plurality of non-specific gravity sorting devices 10 are connected to each other so that the other discharge devices are disposed therebetween, Refers to a state in which the effluent discharged from the one-side specific gravity separator (10) flows directly into the other side gravity separator (10), instead of flowing into the specific gravity separator (10).

7, the inflow pipe 12 of the other side gravity sorter 10 is connected to the outflow pipe 15 of the one side gravity sorter 10 and installed in multiple stages, and the one side gravity sorter 10, The washing water flow rate in the feed pipe 13 of the other side gravity feeder 13 and the washing water flow rate in the feed pipe 13 of the other side gravity feeder 10 are adjusted differently so that contaminants And the other side gravity soring device 10 on the downstream side is operated in such a manner that contaminants having a relatively small specific gravity are separated.

As shown in FIG. 2, the gravity sorter 10 of the present invention is installed in a heavy metal contaminated soil washing facility in which a plurality of particle size sorters 52, a solid-liquid separator 54 and a water treatment facility 60 are combined, The contaminant suspension discharged from the particle size separator 52 or the solid-liquid separator 54 is supplied to the outlet pipe 15 of the sorting apparatus 10 through the inlet pipe 12 of the other side gravity sorter 10, And then flows into the multi-stage non-selected gravity separator 10, and is processed while sequentially passing through the one non-gravity separator 10 and the other gravity separator 10, thereby effectively separating heavy-metal contaminants of various constellations.

10: Specific gravity sorter
11: Hosted
12: inlet pipe
13:
14:
15: Outflow tube
16: Collection pipe
21:
31: discharge valve
41: reflux tube
42: Branch organization
43: reflux valve
44: inclined perforated plate
46: Expansion point
47:
51: preprocessor
52: particle size selector
53: Dehydrator
54: Solid-liquid separator
60: Water treatment facility

Claims (3)

A non-specific gravity sorter for cleaning contaminated soil separating high-shear contaminant particles and low-
An inclined inlet pipe 12 is connected to one side of the standing main pipe 11 and an inlet pipe 12 connected to the main pipe 11 in an oblique direction has its central axis inclined with respect to the central axis of the main pipe 11;
A feed pipe (13) is connected to the other side of the main pipe (11) below the junction of the inclined feed pipe (12);
The upper and lower ends of the main pipe 11 are respectively formed with a ridge 14 connected to the outlet pipe 15 and a collecting pipe 16 whose diameter gradually decreases downwardly;
The suspension of the soil to be treated flows into the inflow pipe 12 while the washing water is fed to the infeed pipe 13 and mixed with the inside of the main pipe 11 so that the heavy polluted particles descend to the collection pipe 16, Wherein the low specific gravity earth particles ascend along with the upward flow of the washing water and flow out to the outflow pipe (15) of the ridge portion (14).
[3] The apparatus according to claim 1, wherein a reflux pipe (41) is connected to the lower end of the collection pipe (16);
A branch pipe (42) branched laterally is formed in the reflux pipe (41);
A discharge valve 31 and a return valve 43 are mounted on the lower end of the reflux pipe 41 and the ends of the branch pipe 42, respectively;
An inclined perforated plate 44 is provided in the reflux pipe 41 in an oblique direction of the central axis of the reflux pipe 41. The lower end of the inclined perforated plate 44 is connected to the bottom of the reflux pipe 41 of the branch pipe 42 Lt; / RTI >
When the reflux valve 43 is closed and the discharge valve 31 is opened, the contaminant suspension passes through the inclined perforated plate 44 and is discharged to the discharge valve 31, so that excessive particle diameter impurities in the contaminant suspension are introduced into the inclined perforated plate 44 Caught;
When the discharge valve 31 is closed and the return valve 43 is opened, the pollutant suspension is discharged to the reflux valve 43, and excessive particle diameter impurities trapped in the inclined perforated plate 44 are discharged. .
A heavy metal contaminated soil washing system equipped with the specific gravity sorting device (10) according to claim 1 or 2,
The washing facility is provided with a plurality of particle size sorters 52, a solid-liquid separator 54 and a water treatment facility 60, and a plurality of gravity soring devices 10 are directly connected to each other,
The inlet pipe 12 of the other side gravity soring device 10 is connected to the outlet pipe 15 of the one side gravity sorter 10 and installed in multiple stages,
The washing water flow rate in the pressure feed pipe 13 of the one side specific gravity discriminating device 10 and the washing water flow rate in the pressure feed pipe 13 of the other side specific gravity discriminating device 10 are adjusted differently so that the grain size sorter 52 or the solid liquid separator 54, Wherein the pollutant suspension discharged from the pollutant discharging device is introduced into the multi-stage connected non-separating apparatus (10) as described above, and is processed while sequentially passing through the one non-separating weight separating apparatus (10) and the other non-separating weight separating apparatus Heavy Metal Contaminated Soil Cleaning Equipment.

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