KR100475431B1 - great measure soil washing apparatus - Google Patents

Abstract

A feed hopper into which contaminated soil is introduced; A log washer for spraying and washing water while transferring the input soil in an axial rotation method; Dual screen for receiving the soil washed in the log washer to take out the soil of more than the first particle size to the outside and discharge the soil of less than the first particle size to the next step; A screw classifier for receiving the soil discharged from the dual screen and the wash water discharged from the log washer and the soil having a second particle size or more is discharged to the outside, and the fine soil below the second particle size is discharged to the next step; A settling tank for precipitating fine soil introduced with the washing water; A filter press for transporting fine soil precipitated in the settling tank to dehydrate to form a cake and to take it out to the outside; And a baker tank that receives and stores the washing water not containing fine soil from the sedimentation tank and the filtered washing water from the filter press, and supplies the stored water to the log washer and removes the oil through the oil separator, and then provides the baker tank to the screw sorter Disclosed is a large-scale soil washing apparatus comprising. A large amount of soil can be treated continuously, the soil is separated and discharged in several stages by particle size, and high soils have the advantage of being able to separate fine soils separately.

Description

Great measure soil washing apparatus

The present invention relates to a large-scale soil washing apparatus, and more particularly, to separate large quantities of contaminated soils at high concentration by separating large quantities of contaminated soil continuously and simultaneously separating them according to particle size. It relates to a large-scale soil washing device to increase the.

Soil washing means harmful organic substances from soil particles by weakening the surface tension of harmful organic pollutants bound to the soil particles using an appropriate cleaning agent containing water or additives, or by eluting by increasing the solubility of heavy metals. It refers to the treatment of the pollutants and heavy metals separately.

Major pollutants to be purified include quasi-volatile organic compounds, oil pollutants and heavy metals, and they also apply to certain volatile organic compounds and pesticides.

Many configurations have been proposed for such soil washing apparatus. For example, utility model registration No. 304970 discloses a soil washing apparatus that minimizes waste and circulates and reuses the washing water. Utility model registration No. 250277 discloses a soil washing apparatus that can be mounted on a vehicle.

However, according to these configurations, a soil washing apparatus capable of continuously processing a large amount of soil, separating the soil in several stages for each particle size, and separating the micro soil is not proposed.

Accordingly, an object of the present invention is to provide a soil washing apparatus capable of continuously processing a large amount of soil, separating the soil in several stages for each particle size, and separating the micro soil separately.

Other objects and features of the present invention will be more clearly understood from the embodiments described below.

According to an embodiment of the present invention, a feed hopper into which contaminated soil is introduced; A log washer for spraying and washing water while transferring the input soil in an axial rotation method; Dual screen for receiving the soil washed in the log washer to take out the soil of more than the first particle size to the outside and discharge the soil of less than the first particle size to the next step; A screw classifier which receives the soil discharged from the dual screen and the wash water discharged from the log washer and discharges the soil having the second particle size or more to the outside, and discharges the fine soil below the second particle size to the next step; A settling tank for precipitating fine soil introduced with the washing water; And a large-scale soil washing apparatus including a filter press for transporting fine soil settled in a sedimentation tank to be dehydrated and taken out to the outside.

Preferably, the tank further includes a baker tank for receiving and storing the washing water containing no fine soil from the sedimentation tank and the filtered washing water from the filter press, and supplying water to a log washer.

In addition, when washing the soil contaminated with oil, the water stored in the baker tank may be provided to the screw sorter after the oil is removed through the oil separator.

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Preferably, a flocculant may be added to the settling tank to increase the settling speed of the micro soil.

In addition, the log washer is provided with paddles extending radially on one axis of rotation along the longitudinal direction, a plurality of spray nozzles are installed along the longitudinal direction on the top of the axis of rotation.

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

1 is a schematic diagram showing a soil washing apparatus according to the present invention.

Each device constituting the soil washing apparatus of the present invention is appropriately arranged in an area of approximately 30m horizontally and 30m vertically, and the transport of soil between the devices or the transport of the soil discharged after the treatment is completed from each device is Basically, conveyor belts are used.

The feed hopper 10 is fed with contaminated soil having a particle size of 100 mm or less by using equipment such as a backhoe.

Preferably, for example, a 90 mm × 75 mm screen may be installed at the inlet hopper inlet in order to prevent the large sized stone from being introduced and tripping the log washer 20 installed at the rear end. In addition, as an example, the capacity of the input hopper 10 may be 3 m 3.

Soil introduced through the conveyor belt 12 connected to the bottom of the input hopper 10 is mixed with the water in the log washer (20).

2, the log washer 20 applied to the present invention is a paddle type (paddle type) is a plurality of paddles 24 are attached to one axis of rotation (22). In addition, water is sprayed through the spray nozzles 26 installed above the log washer 20. Therefore, when the rotating shaft 22 is rotated to transport the soil by the paddle 24, water is sprayed and mixed from the spray nozzles 26 to wash the soil. Preferably, the throughput of the contaminated soil can be adjusted by adjusting the rotational speed of the rotating shaft 22.

The water to be supplied is pumped and supplied from a baker tank 60, as will be described later, and the washing water which washes the soil is discharged to a screw classifier 40.

For example, the size of the log washer 20 is about 4.56m in length, 0.66m in width and about 0.72m in height, and the driving motor for rotating the rotating shaft may use about 15 horsepower.

The soil washed from the log washer 20 is input to a dual screen 30 to separate the soil based on the first particle size.

3 shows a dual screen applied to the present invention, which separates soil in a vibrating manner. For example, a grid screen of 50 mm x 50 mm is installed at the top, and a grid screen of 10 mm X 10 mm is installed at the bottom. Can be.

The first particle size may be set to about 10mm, the soil of more than 10mm is taken out through the conveyor belt 32 connected to the dual screen 30, the soil of 10mm or less is washed water taken out from the log washer 20 Together with the screw sorter 40.

Referring to FIG. 4, the screw sorter 40 classifies the soil into more than 10 meshes (0.154 mm) and smaller soils through an auger 43 installed therein.

That is, over 100 mesh of soil is moved to the upper end of the screw sorter 40 is carried out to the outside through the conveyor belt 42 connected to the upper end. In addition, the fine soil of less than 100 mesh is transferred to the sump (45) with the washing water is transferred to the classifier (50) by the diaphragm pump (48).

The auger 43 of the screw sorter 40 has a length of about 6m, a diameter of about 520mm, and a driving motor of about 7.5 horsepower can be used.

The settling tank 50 is made of a cone (cone) of about 60 degrees to precipitate the fine soil introduced with the wash water. Preferably, a coagulant may be added to increase the settling speed of the fine soil in order to prevent the introduced fine soil from flowing into the baker tank 60.

The fine soil precipitated in the settling tank 50 is introduced into the filter press 70 by the diaphragm pump 55. In the filter press 70, the introduced micro soil is dewatered, and the dewatered micro soil forms a cake and is taken out through the conveyor belt 72, and the filtered treated water is transferred to the baker tank 60.

The filter press 70 uses filter paper to filter the washing water, and is periodically replaced after a certain period of time. For example, the size of the filter paper is about 610mm x 610mm, the number of filter plates is about 22.

The washing water from which the fine soil is removed from the sedimentation tank 50 and the washing water filtered from the filter press 70 are stored in the baker tank 60, and the oil contained in the stored water is removed through the oil / water separator 64. The bioreactor 66 is optionally subjected to a microbial reaction treatment.

Example

2,100 tons of soil contaminated with crude oil (concentration of contaminated soil average TPH 5,000 mg / kg) was washed using the soil washing apparatus of the present invention after a 40-day restoration period.

The amount of soil injected was 12 tons per hour, the operation time was 5.5 hours per day, and the water consumption was 12 tons per hour. Soil and water maintained a ratio of 1: 1.

The removal rate of contaminants in the soil was measured using a simple tester (Petroflag), and the soil having a particle size between 100 mesh (0.154mm) to 10mm.

The measurement results are summarized in the table of FIG. 5, and the contaminated soil having an average TPH concentration of 5,006 ppm was reduced to an average of 458 ppm, and showed about 91% of pollutant removal efficiency.

Although the above has been described based on the preferred embodiment of the present invention, it can be appropriately changed or modified by those skilled in the art without departing from the spirit of the present invention. It is natural that such changes or modifications fall within the scope of the present invention without departing from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the above embodiments, but should be determined by the claims described below.

As described above, according to the present invention, there is an advantage in that a large amount of soil can be treated continuously. In other words, by configuring each unit unit in a large configuration by connecting a conveyor belt it is possible to continuously process a large amount of soil.

In addition, the soil can be separated and discharged in several stages for each particle size, in particular fine soil has the advantage that can be separated separately using a sedimentation tank.

Moreover, there is an advantage that the washing efficiency is excellent while being able to clean a large amount of contaminated soil in a short time.

1 is a schematic diagram showing a soil washing apparatus according to the present invention.

Figure 2 shows a log washer applied to the present invention.

Figure 3 shows a dual screen applied to the present invention.

Figure 4 shows a screw classifier applied to the present invention.

Figure 5 is a table showing the result of washing the contaminated soil using a soil washing apparatus according to the present invention.

Claims (6)

A feed hopper into which contaminated soil is introduced; A log washer for spraying and washing water while transferring the injected soil in an axial rotation method; Dual screen for receiving the soil washed in the log washer to take out the soil of more than the first particle size to the outside and to discharge the soil of less than the first particle size to the next step; A screw classifier (Screw classifier) for receiving the soil discharged from the dual screen and the washing water discharged from the log washer to the outside of the second particle size to the outside, and discharges the fine soil below the second particle size to the next step ); A precipitation tank for precipitating the fine soil introduced with the washing water; A filter press for transporting the fine soil precipitated in the settling tank to dehydrate and carry out the cake to the outside; And The washing water does not contain the fine soil from the sedimentation tank and the filtered washing water from the filter press is received and stored, and the stored water is supplied to the log washer and at the same time the oil is removed through an oil separator and provided to the screw sorter. Large-scale soil washing apparatus comprising a baker tank. delete delete delete The large-scale soil washing apparatus according to claim 1, wherein a flocculant is added to the settling tank to increase the settling speed of the fine soil. According to claim 1, The log washer is a large capacity soil characterized in that the paddles extending radially on one axis of rotation is installed along the longitudinal direction, a plurality of spray nozzles are installed along the longitudinal direction on the top of the axis of rotation. Washing device.