KR20080074841A - Soil washing plant using deposition desorption tank - Google Patents

Abstract

A soil washing apparatus with a sediment separating tank is provided to improve a washing effect and a recovering effect of contaminated soil and accelerate prompt recovery of the contaminated area by reducing the residual amount of contaminants while maintaining the soil particle size distribution in a desired way to the utmost. In a soil washing apparatus in which a plurality of soil washers, grit chambers, and purifiers are installed, a soil washing apparatus with a sediment separating tank is characterized in that: a separating tank(60) and a hydrocyclone are connected to a final grit chamber; the separating tank includes a plurality of rotary vanes(66) rotatably connected, through a rotary shaft(65), to a drive motor(64) in a central part of a body(61) having a discharge port(63) formed on a bottom part thereof; a final sediment discharged from the final grit chamber flows into the separating tank; a final sediment discharged from the separating tank through the discharge port flows into the hydrocyclone; and a final sediment flown into the hydrocyclone is separated into water and solids. The soil washing apparatus comprises a plurality of projecting plates(62) installed on an inner peripheral surface of the body of the separating tank. Further, a plurality of through holes are formed in the plurality of rotary vanes.

Description

[Background Art] [0002] Soil washing plants using deposition desorption tanks,

The present invention relates to a soil washing apparatus comprising a plurality of soil washing apparatuses and a soil washing apparatus including a tiller, a solid-liquid separating apparatus and a purifying apparatus, wherein the final tiller and the hydrocyclone are connected to the final tiller to further process the final sediment particles discharged from the final tiller, So as to reduce the residual amount of contaminants in the washed soil.

Purification of soils contaminated by various pollutants such as organic matter, inorganic salts and heavy metals can be classified into on-site treatment and off-site treatment depending on whether or not the contaminated soil is transported. Normally, A method of introducing a chemical reaction inducing substance such as a reaction wall, and a method in which the contaminated soil is collected and treated 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 washing the soil particles constituting the soil through the washing water as in the dictionary meaning. According to the reuse of the washing water, Equipment and a no-discharge type facility as shown in FIG.

The discharge facility is a method of cleaning the soil through the washing water taken from the water source and discharging it to the sewage or the river. The no-discharge type facility is a system in which the discharged water after the washing process is purified and reused In the no-discharge type soil washing facility, the facilities such as securing the treatment capacity of the purification facility 30 for the purification treatment of the effluent water and the washing water supply tank 10 for temporarily storing and supplying the purified effluent water are compared with the discharge type It is necessary to increase the efficiency and miniaturization of the equipment for performing the soil washing process. Therefore, as shown in FIG. 2, the overflow portion is formed and divided into the plurality of gills by dividing the gills. A climbing type gill climbing paper 43 which can classify the sedimentation by the particle size is applied.

Such a wet-lawn cistern and related soil-free soil washing facilities have been developed by the same person as the present applicant and have been registered as patent No. 779992.

As shown in FIG. 1, the contaminated soil collected from the contaminated area is discharged to the soil washing apparatus (not shown) together with the washing water taken from the water source, 20). The drain water discharged from the washing process contains a considerable amount of gravel, and various solid-liquid separation devices for separating the gravel contained in the drain water and purifying the drain water are provided in various stages The soil washing apparatus 20 for each particle size of the soil washing apparatus is constituted in the soil washing apparatus.

Here, the soil washing apparatus 20 is a device for separating washed soil particles and wash water by passing polluted soil together with wash water, washing through pressurization, vibration, rotation and stirring, and passing through a screen of a mesh screen Since the washed soil is basically separated from the washing water by the screen, only the soil particles having a predetermined particle diameter or more are collected, and the gravel having a particle diameter smaller than that is discharged together with the washing water.

Accordingly, a plurality of soil washing apparatuses 20 may be constructed step by step for each particle size, or a screen in the soil washing apparatus 20 may be configured in multiple stages. In this case, a screening apparatus for sorting the soil- Or dewatering device are similar to the above-described soil washing device 20, so that the sorting device, the soil washing device 20 and the dewatering device are mixed in the actual soil washing process.

As shown in FIG. 1, the contaminated soil is cleaned by the soil washing apparatus 20 through coarse-grained soil through the initial soil washing apparatus 20, As shown in the figure, the discharged water is supplied to the soil washing apparatus 20 for washing the neutral soil (medium-sized soil), and the soil washing apparatus 20 are carried out in combination for forward transfer and reprocessing, and a hydrocyclone 51, a sedimentation pond and a screw-decanter 52, etc., The effluent discharged in the form of a supernatant in the final clinker is separated into a purification facility 30 for performing a physical or biochemical treatment such as a coagulating sedimentation tank and a reaction tank, To And it is discharged after the purification treatment.

As shown in FIG. 2, the no-discharge type soil washing apparatus has a structure in which the discharged water purified through the purification facility 30 is temporarily stored in the wash water supply tank 10 and reused as wash water. For the sake of simplification and high efficiency, a swim gypsum (43) is installed, and the washed gypsum separated by granularity such as granulation, neutral, fine granular and washed gypsum is discharged.

As can be seen from FIGS. 1 and 2, the final sediments among the solids discharged from the soil washing facility through the soil washing facility, whether discharged or not, have the smallest particle size among the washed soil samples The particle structure of the micro washed soil gypsum is illustrated in the enlarged portion in the ellipse of FIGS. 1 and 2. FIG.

In the discharged type soil washing apparatus illustrated in FIG. 1, two gypsums, ie, a first gypsum 41 and a second gypsum 42 are formed, and the initial sediment discharged from the first gypsum 41 is discharged to the soil washing apparatus And the final sediment discharged from the second sedimentation unit 42 is dehydrated by the screw decanter 52 as a dehydrating unit to constitute the particulate washing soil. The final precipitate particles having aggregates of soil particles and contaminant particles of various particle diameters are aggregated as in the enlarged part in the ellipse at the bottom of the same figure.

2, one sweeping type climbing bed 43 is constituted, and the initial settling and final settling, respectively discharged from the inflow and outflow chambers constituting the sweeping type climbing bed 43, The soil washing and fine washing soil is formed through the washing device 20 and the screw decanter 52. In the soilless soil washing facility, too, the soil particles and contaminant particles of various particle sizes are aggregated as in the enlarged part in the ellipse It constitutes microfine soil.

Therefore, it is highly likely that contaminant particles will be included in the micro-washed soil, that is, the final dehydrated sediment, having the minimum particle size among the washed soil samples washed by the discharge type and the no-discharge type soil washing facilities. Therefore, There is a problem that contaminants may remain.

Also, in case of disposal without including microbial washing soil to avoid such contamination residue, there is a serious problem that the soil to be buried has a poor particle size distribution with a fine grain size distribution.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a soil washing apparatus provided with a plurality of soil washing apparatuses 20 and a tilling apparatus and a purifying apparatus 30. The tilling tank 60 and the hydrocyclone 51 A plurality of rotor blades 66 are connected to the center of the main body 61 having an outlet 63 at the lower portion thereof and connected to the driving motor 64 through a rotary shaft 65, And the final sediment discharged from the final sedimentation tank flows into the sedimentation tank 60 and the final sediment discharged from the sedimentation tank 60 through the discharge port 63 flows into the hydrocyclone 51 and the hydrocyclone 51 The soil removing apparatus according to the present invention is characterized in that a plurality of stone plates 62 are installed on the inner circumferential surface of the body 61 of the desorption tank 60, Sediment tally The soil is washed, fitted, the rotor 66 has a plurality of through holes 67 is formed, projecting plate (62) is a soil cleaning plant characterized by having an inclination and are installed sediment desorption Joe.

It is possible to improve the cleaning effect and restoration effect of the contaminated soil and promote the rapid recovery of the contaminated area by reducing the residual amount of the pollutant while keeping the particle size distribution of the soil treated and treated with the soil washing facility as good as possible .

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A detailed configuration of the present invention will be described with reference to the accompanying drawings.

FIGS. 3 and 4 illustrate the construction of a discharged type soil washing facility and a no-discharge type soil washing facility to which the present invention is applied. As can be seen from these drawings, a plurality of discharge type and non- A soil washing apparatus 20, a tillage apparatus, a solid-liquid separating apparatus, a dewatering apparatus, and a purifying apparatus 30, and discharges the washed soil from granulation to fine particle size.

As shown in FIG. 3 and FIG. 4, the desalination unit 60, which is a key element of the present invention, is connected to the final clinker where the final sediment constituting the particulate washed soil is discharged, In the case of the discharge type soil washing apparatus equipped with the three-stage soil washing apparatus 20 as shown in FIG. 3, the final gypsum becomes the second gypsum 42, and as shown in FIG. 4, In the case of a no-discharge type soil washing apparatus in which a three stage soil washing apparatus 20 is installed and a monthly type gill apparatus 43 is applied, the final gill apparatus is a so-called gill type climbing paper 43, .

That is, the final climatic zone means a climatic zone for discharging the final sediments constituting the particulate washed soil.

The final sediment discharged from the final sedimentation tank flows into the sedimentation tank 60 and is subjected to a desorption process in which final sediment particles formed by agglomerating large and small particles and contaminant particles are separated from each other. And is separated into water and solid components while passing through the hydrocyclone 51 which is a high-speed solid-liquid separation device. At this time, the relatively granular soil particles are discharged as a solid component to the lower side of the hydrocyclone 51, The small contaminant particles and the fine particle are contained in the water to be discharged to the upper side of the hydrocyclone 51.

3 and 4, the solid component discharged from the hydrocyclone 51 is dehydrated through a screw decanter 52 as a dehydrator to constitute a particulate washed soil, and the contained water is re- But it is also possible to transfer the treated water to the purification facility 30 without re-introducing the water into the final settlement.

The final sediment that has been treated through the desorbing tank 60 constitutes the particulate washing soil as the soil particles from which the contaminant particles have been removed as in the enlarged portion in the lower ellipse of FIGS. 3 and 4. In this case, (60) is as follows.

5 shows the outline of a basic type desorption tank 60. As shown in the figure, the desorption tank 60 of the present invention has a plurality of protrusions 62 formed on its inner circumferential surface and a discharge port 63 ) Is formed in the shape of a circular water tank.

6 and 7 are respectively a partially cut exploded perspective view and an operating state representative cross-sectional view of the embodiment shown in FIG. 5. As can be seen from these drawings, a plurality of rotor blades 66 are installed at the inner center portion of the main body 61 And these rotor blades 66 are connected to the drive motor 64 via the rotary shaft 65 so that the final settling of the half-liquid phase balance stored in the desalination vessel 60 flows as the rotor blades 66 rotate, And the stone publication 62, as well as the collision between constituent particles, are caused to separate the final precipitate particles from each other.

8 and 9 are a partially cut exploded perspective view and an operating state representative cross-sectional view of an embodiment in which a slant is formed in the stone plate 62 and a through hole 67 is formed in the rotor blade 66, The power required for driving can be reduced and the pressure load acting on the rotor blades 66 and the stone presses 62 can be reduced.

That is, since high pressure is applied to the rotor blade 66 and the stone plate 62 during rotation of the rotor blade 66, the rotor blade 66 is formed with a through hole 67 Thereby reducing the rotational resistance of the rotor blades 66 to reduce the required power and securing the rotational speed and to reduce the pressure acting on the stone plate 62 by applying a tilt to the stone plate 62 as well.

Fig. 1 is a schematic diagram of a conventional discharge type soil washing equipment

FIG. 2 is a schematic diagram of a conventional no-

FIG. 3 is a schematic diagram of a discharge type soil washing apparatus to which the present invention is applied

Fig. 4 is a schematic diagram of a no-discharge type soil washing apparatus to which the present invention is applied

FIG. 5 is a perspective view of a tear-

FIG. 6 is a partially cut exploded perspective view of the embodiment of FIG.

Figure 7 is a schematic cross-

8 is a partial cutaway exploded perspective view of a modified embodiment of the present invention,

FIG. 9 is a schematic cross-

Description of the Related Art [0002]

10: Washing water supply tank

20: Soil cleaning device

30: Purification facility

41: 1st tidal flat

42: 2nd tidal flat

43: Monthly style

51: hydrocyclone

52: screw decanter

60:

61:

62: Stone Publishing

63: Outlet

64: drive motor

65:

66: Rotor blade

67: Through hole

Claims (4)

In a soil washing facility provided with a plurality of soil washing apparatuses 20, a gypsum and a purification facility 30, the final gypsum is connected to a desalination tank 60 and a hydrocyclone 51; The desorption tank 60 is provided with a plurality of rotor blades 66 connected to a central portion of a main body 61 having a discharge port 63 at a lower portion thereof via a driving motor 64 and a rotary shaft 65, The final sediment discharged from the final sedimentation tank flows into the sedimentation tank 60; The final sediment discharged from the desorption tank (60) through the discharge port (63) flows into the hydrocyclone (51); Wherein the final sediment introduced into the hydrocyclone (51) is separated into water and solid. The soil washing apparatus according to claim 1, wherein a plurality of stone plates (62) are installed on the inner circumferential surface of the main body (61) of the desorption tank (60). The soil washing apparatus according to claim 1, wherein a plurality of through holes (67) are formed in the rotor blade (66) of the desorption tank (60). The soil cleaning system according to claim 2, wherein the stone press (62) has a slope.

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