KR100828545B1 - Soil washing machine by high pressured air-lifting and turbulence - Google Patents

Abstract

An apparatus and a method for washing of soil are provided to allow the detergent to separate soil and a contamination source and remove the contamination source strongly adsorbed onto the soil through collision and friction between the soils by stirring contaminated soil and the detergent, forming a turbulent flow, and generating air-bubbles in a washing tank into which a proper detergent is injected, thereby performing a chemical treatment and a physical treatment in succession. An apparatus for washing of soil by high pressure ejected air-bubbles and turbulence comprises: a washing tank(1) in which a turbulent flow forming device(30) is embedded, the turbulent flow forming device comprising a turbulent flow forming cone(9) having whirling vanes(7) spirally formed on an outer periphery thereof, and a cylindrical draft(8) fixed by a plurality of fixing members; a solid-liquid transfer equipment(40) including a circulation pipe(4) connected to an inner part of the draft, a suction port(2) connected to the washing tank, a discharge pipe(14) for discharging contents of the washing tank, a solid-liquid transfer pump(3) formed on a part at which the circulation pipe, the suction port and the discharge pipe are connected to one another, and a discharge control valve(15) installed on the discharge pipe; an air supplying, joining and transferring equipment(50) including an air supply pump A(5) and an air supply pipe(6) which supplies air supplied from the air supply pump A, and of which an end portion is connected to the circulation pipe; and a high pressure air ejector(60) including ejection nozzles(12) which are installed on a bottom part of the washing tank and connected to a circular air supply pipe(11) such that the air supply pipe is connected to an air supply pump B(10).

Description

Soil washing machine by high pressured air-lifting and turbulence

1 is a overall configuration of the soil washing apparatus by the high-pressure air bubble and turbulence forming apparatus of the present invention

2 is a flow chart according to the high liquid-pressure injection of the present invention

Figure 3 is a flow chart of the fluid according to the high pressure jet of the present invention

4 is a complete turbulence flow chart in accordance with the present invention.
5 is a cross-sectional view showing the overall configuration of the soil washing apparatus by the high-pressure air bubble and turbulence forming apparatus of the present invention

<Description of the code | symbol about the principal part of drawing>

1: washing tank 2: suction port

3: solid-liquid transfer pump 4: circulation pipe

5: air supply pump A 6: air supply pipe

7: whirlwind 8: draft

9: cone 10: air supply pump

11 air supply pipe 12 injection nozzle
14; Outlet line 15: control valve
30: turbulence forming device 40: solid-liquid transfer unit
50: conveying device 60: air high pressure jet device

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The present invention relates to a soil washing method for restoring soil contaminated with oil, and more particularly, to desorb or desorb oil adsorbed to contaminated soil based on physical agitation. It is a device that can simultaneously handle a large amount of contaminated soil in quantity.

Oil and organic pollutants spilled due to equipment aging and careless handling of facilities designated as soil pollution facilities in the Soil Environment Conservation Act, such as petroleum storage facilities, petrochemical plants, etc. Soil pollution is indirect, chronic, economically and timely, it is difficult to fully restore. Most of the stored fuels are composed of complex petroleum hydrocarbons, which contain a lot of harmful substances to human body and soil organisms. Therefore, appropriate treatment for such contaminated soil is required. In addition, soil pollution, which has been previously overlooked due to factory relocation, land site development, and development, is being highlighted by soil status survey and soil environment evaluation. In this case, soil pollution purification work is accompanied by construction work. In the reality that a series of processes are being performed, a method of digging contaminated soil in a short time with low cost and high efficiency is preferred.

In areas where it is impossible to dismantle or shut down facilities, such as gas stations, oil refineries, and chemical plants, on-site treatment is used to directly treat underground pollutants at the site. Off-site treatment is used to excavate contaminated soil. In the off-site treatment, if the polluted site is a source of low depth, the soil farming method, an aerobic biodegradation process that supplies air by excavating to the ground and depositing it on the ground at low height periodically, is used. come. However, the soil cultivation method requires a lot of processing space because it has to be wide-spread at low height and has a lot of contact space with the atmosphere, and there is a problem that volatile organic substances are scattered into the air causing secondary pollution and essential for microbial activity during biodegradation and purification work. There is a disadvantage in that the cultivation treatment must be performed periodically so that oxygen is efficiently supplied. As a result, the ground field treatment method (Biopile), which can treat oil and organic pollutants through active decomposition of microorganisms by supplying oxygen to contaminated soils that are highly confined to the ground and infiltrating into the soil layer from a narrow site, It is used.

Ground yard treatment method is to excavate contaminated soil, build a site such as a membrane and a drainage channel on the ground surface, pile up contaminated soil to the upper layer on the site, install a membrane over the contaminated soil, and install a perforated pipe inside the soil layer. By supplying air under reduced pressure or pressure, continuous air flow is induced to promote and remove oil and organic contaminants remaining in the pores of the soil. Although it can be applied in such a narrow site, it is possible to prevent the spread of secondary or tertiary pollution by volatile contaminants released to leachate and air by changing the pollutant source to gas phase, but this method is also the target site. Soil is difficult to secure and there is a limit to the application of soil containing a large amount of groundwater, it takes a long time depending on the amount of purified soil.

Accordingly, there is a soil washing method that can directly treat the contaminated soil in a short time, and solve the high concentration of pollutants or narrowing of the purification site. This method uses chemical cleaning of the excavated contaminated soil by water washing or cleaning agent. The treatment is carried out using a technical method of directly recovering the pollutant source or converting it into a free state such as gaseous phase or liquid phase.

So far, the soil washing method has excavated contaminated soil to the ground to quickly clean up the contaminated site regardless of the presence of groundwater and transported the excavated soil intermittently or continuously to the washing device containing the washing water. After washing in stirring or rotating drums, the washed soil is discharged and recycled or reclaimed, and the wash water generated by separating it from soil is biologically or physically purified in a separate facility and satisfies the water quality regulation. The discharge proceeds in a series of operations. In addition, the soil washing method is to put the excavated contaminated soil into a certain washing device, to physically agitate the cleaning agent, such as surfactant, and to proceed with chemical treatment by the cleaning agent, conventional soil washing method takes a long time to wash In addition, the amount of the cleaning agent takes a large amount more than the appropriate amount depending on the amount of loss, etc. There is a disadvantage that the purification efficiency is lowered if the amount of the cleaning agent calculated according to the average pollution concentration due to the heterogeneity of the soil.

Accordingly, in order to apply the soil washing method, the physical treatment effect is improved, so that the chemical treatment efficiency by the washing agent is further increased. Was needed.

The present invention is an apparatus and method for purifying excavated oil contaminated soil by soil washing method in an off-site treatment method, by agitating and contaminating soils and a turbulence forming device by solid-liquid injection in a washing tank in which an appropriate detergent is injected. Soil cleaning to remove the pollutants strongly adsorbed on the soil by the separation of soil and pollutants by the cleaning agent and the collision and friction between the soil by chemical treatment and physical treatment by the air bubbles generated by the turbulence and high pressure spray Apparatus and method.

Excavate the contaminated soil and screen it with a particle size of 5mm or less and inject the cleaning agent, washing water and soil in a specific ratio into a specially designed cleaning tank. The solid solution of the injected soil and water is simultaneously transferred at high speed through the solid-liquid transfer pump through the suction port and the circulation pipe installed at the bottom of the washing tank, and the high-pressure jet of the fluid is in contact with the high pressure air supplied from the end of the circulation pipe. This is followed by stirring. In addition, the injected fluid causes turbulence by the turbulence forming device installed at the center of the bottom of the washing tank, and the turbulence causes collisions and frictions between the soils, weakening the adhesion and cohesion between the soils, and in particular, the fluid flow and frictional force by the whirlwind wing. Increasingly, desorption of adsorbed pollutants occurs. It also raises oil by air bubbles sprayed at high pressure from the diffuser installed at the bottom of the washing tank, and prevents the fluid descending along the whirlwind to settle at the edge of the circular reactor and generate continuous turbulent flow.

Accordingly, the present invention compensates for the drawback of a large amount of detergent being injected due to a decrease in the efficiency of the detergent and the degree of agitation, depending on the chemical treatment rather than physical treatment by agitation between the detergent and the contaminated soil, such as the conventional surfactant. In addition, the pollutants strongly adsorbed to the fine soil are not easily desorbed even by agitation, so that they are strongly adsorbed on the fine soil by enhancing physical treatment by air bubbles and turbulence forming devices by high pressure injection. There is a feature that can be removed more easily.

In addition, the exhaust gas containing volatile organic compounds (VOC, Volatile Organic Carbons) generated by the volatilization of oil due to the effect of air stripping by air bubbles in the washing tank reduces volatile gas in order to prevent emissions to the atmosphere. Will be transferred to the machine and reduced.

Referring to the accompanying drawings the structure of the soil washing apparatus according to the present invention.

The apparatus of the present invention and the washing tank 1 is made so that the contaminated soil, water and the washing liquid as shown in the overall configuration of Figure 1; Turbulence forming device 30 for desorbing the contaminant formed in the washing tank (1); Solid-liquid transfer unit 40 for circulating the contaminated soil and washing water in the washing tank (1); An air supply confluence transporting device 50 for introducing air into the solid-liquid transporting unit 40; And it is composed of an air high-pressure spraying device 60 for increasing the turbulence of the contaminated soil and washing water in the washing tank (1).
The washing tank (1) is composed of a circular body, the inlet for introducing contaminated soil and washing water in the washing tank (1) is configured.
The turbulence forming apparatus 30 is configured to turbulent the contaminated soil and washing water introduced from the circulation pipe 4 and constitutes at least three or more spirally formed on the outer circumference of the turbulence forming cone 9 and the cone 9. It consists of a cylindrical draft (8) which is fixed by a whirlwind blade (7) and a cone (9) and several fixing rods (8a).
The solid-liquid transfer device unit 10 of the draft (8) configured in the turbulence forming device 30 is formed through the suction port 2 and the upper center of the washing tank 1 is fixed to the lower end of the washing tank (1) It consists of a circulation pipe (4) and the discharge pipe (14) connected to the inside, and the solid-liquid transfer pump (3) is configured at a portion where the inlet (2), the circulation pipe (4) and the discharge pipe (14) are connected to each other, the discharge pipe ( 14) is composed of a structure in which the discharge control valve (15) is configured.
The air supply confluence transfer device 50 is a device for introducing air into the circulation pipe 4, the air supply pipe for supplying air supplied from the air supply pump A (5) and the air supply pump (A) ( 6), the end of the air supply pipe (6) is made of a structure that is configured to be connected to the circulation pipe (4).
The high-pressure air injection device 60 is a device for blowing air at high pressure to form a strong turbulent turbulent soil and washing water in the washing tank (1), at least four or more injection nozzles at the bottom of the washing tank ( 12) and the injection nozzle 12 is connected to the circular air supply pipe 11, the air supply pipe 11 is made of a structure connected to the air supply pump B (10).
At this time, the direction that the injection nozzle 12 is configured to face the center of the cone (9) but may be configured to be slightly inclined.
Referring to the working state of the present invention configured as described above,
Water and the cleaning solution for washing the contaminated soil of 5 mm or less in the washing tank 1 are operated, and the air supply pump B 10 of the high-pressure spray device 60 is operated to spray air through the air supply pipe 11. Air is injected into (12).
This causes the contaminated soil and water and the washing liquid (hereinafter referred to as contents) filled in the inside of the washing tank (1) to cause turbulence and to agitate the contents.
In addition, the contents are contacted by the air injected at a high pressure to maximize the fluid rise effect.
At the same time, when the solid-liquid transfer pump 3 and the turbulence-forming apparatus 30 are operated while the control valve 15 of the solid-liquid transfer unit 40 is locked, the contents are connected to the inlet 2 and the circulation pipe 4. Will be injected from the upper side of the draft (8) through the turbulence is caused by the cone (9).
At this time, the circulated contents are formed when the air generated from the air supply pump A (5) of the air supply confluence transporting device (50) supplies air to the circulation pipe (4), so that an air layer is formed on the supplied contents, and thus frictional and turbulent properties It can be excellent.
When this condition is repeated, friction forces increase due to the collision between soils, thereby desorbing oil, and volatilizing volatile oils dissolved in water, thereby causing the oil to float.
In particular, it is possible to prevent the sedimentation and sedimentation of the soil by the air pressure sprayed through the injection nozzle in the lower portion is to evenly wash the contaminated soil.
Since the present invention is to reduce the volatile gas using a volatile gas reducer to discharge to the atmosphere, the washed contents can be discharged to the outside through the discharge pipe when the control valve is opened.

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As described above, the present invention can be produced by adjusting the capacity of the soil contaminated with oil irrespective of the contaminated soil, and can be installed according to the site conditions by fixed and mobile production. In addition, the existing soil washing apparatus has a disadvantage in that the washing efficiency is lowered by injecting the washing solution by calculating the pollution concentration before washing, and the washing efficiency is lowered due to the inability to insert the washing solution, or the soil washing operation is performed in an uneconomic manner. However, this equipment has the advantage of performing high-efficiency soil cleaning at low cost because it simultaneously performs physical treatment by air droplets and turbulence formation due to high liquid feed and high pressure injection, as opposed to proper washing liquid injection.

Existing soil washing apparatus has the disadvantage that the washing water must be treated as a separate wastewater treatment facility after the washing operation is completed by the excessive injection of the washing liquid and dissolved oil components in the water, but the present invention is directed to air bubbles by high pressure spraying. By volatilizing the dissolved volatile oil and floating the oil in the water, there is an advantage that can be used to recycle the waste water does not need to separate the waste water treatment by removing only the injured oil.

In addition, desorption of oils strongly adsorbed to soil by collision and friction between soils by turbulence generated by turbulence forming device due to stirring operation by simultaneous transfer of contaminated soil and washing water by solid-liquid transfer pump and high pressure injection into water By overcoming the limitation of the purification efficiency by the cleaning solution, there is an advantage that can improve the overall purification efficiency by improving the physical treatment efficiency.

Claims (4)

A washing tank having a turbulent forming device composed of a turbulent forming cone having a spiral whirlwind formed in a circumference and a cylindrical draft fixed between a plurality of fixed parts; A solid-liquid transfer pump configured at a portion where a circulation pipe connected to the inside of the draft, a suction port connected to the washing tank, and a discharge pipe for discharging the contents of the washing tank are connected to each other, and a discharge control valve is configured at the discharge pipe; An air supply pipe for supplying air supplied from the air supply pump A and the air ball pump A, and an end of the air supply pipe includes an air supply confluence transfer device configured to be connected to the circulation pipe; The injection nozzle is configured at the bottom of the washing tank, and the injection nozzle is connected to a circular air supply pipe, and the air supply pipe is composed of an air high pressure injection device configured to be connected to an air supply pump B. Soil cleaning system using drops and turbulence delete delete delete

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