Composite remediation treatment system for volatile organic contaminated soil

Abstract

The invention discloses a composite remediation treatment system for volatile organic contaminated soil, which comprises static remediation units, a dynamic remediation unit and a pollution gas collection mechanism, the dynamic remediation unit is connected with a plurality of groups of static remediation units to receive the contaminated soil sent from the static remediation units, and the pollution gas collection mechanism is connected with the dynamic remediation unit. The pollution gas collecting mechanism is respectively communicated with the static remediation unit and the dynamic remediation unit so as to pump out organic pollutants volatilized from the remediation units for centralized treatment. By means of the mode, according to the composite remediation treatment system for the volatile organic contaminated soil, through cooperation of the multiple remediation units, volatilization of organic pollutants in the contaminated soil is accelerated, the remediation effect of the contaminated soil is effectively improved, the remediation period is shortened, the remediation efficiency is greatly improved, and the remediation cost is reduced. The stability and the adaptability are high.

Description

Technical Field

[0001] The invention relates to the technical field of environmental remediation, and in particular to a composite remediation treatment system for volatile organic polluted soil. Background Art

[0002] Pesticide plants, coking plants, petroleum processing plants and other industrial plants produce products containing volatile organic compounds and semi-volatile organic compounds, which cause increasing organic pollution to the soil. With the change of urban development plans, factories are relocated to new sites, and it is urgent to treat soil pollution in retired plant areas to meet the new development plans.

[0003] The chemical heating soil remediation process can increase the temperature of the soil through chemical agents to promote the volatilization of organic pollutants. However, in order to achieve the treatment effect, the existing chemical heating process needs to add a large amount of chemical heating agents, which will not only increase the cost of soil remediation, but also may lead to the formation of more toxic by-products, making it difficult to adapt to the requirements of green and energy-saving production. The mechanical ventilation soil remediation process uses mechanical disturbance of the soil and strengthens convection ventilation at the same time. It strengthens the contact between organic pollutants and air through physical effects and promotes the volatilization of organic pollutants. However, in actual application, when the contaminated soil particles are large and sticky, the simple use of mechanical ventilation technology will lead to excessively high concentrations of pollutants remaining in the soil, which cannot meet the requirements of the site pollution target value. Summary of the invention

[0004] In order to solve the above technical problems, a technical solution adopted by the present invention is: Provided is a composite remediation and treatment system for volatile organic polluted soil, comprising: a static remediation unit, a dynamic remediation unit, and a polluted gas collection mechanism, wherein the dynamic remediation unit is connected to a plurality of groups of the static remediation units to receive the polluted soil sent from the static remediation units, and the polluted gas collection mechanism is respectively connected to the static remediation unit and the dynamic remediation unit to extract the organic pollutants volatilized from the remediation unit for centralized treatment; The static remediation unit comprises a first remediation bin, a feeding belt, a first feeding port, a soil block breaking mechanism, a first agent feeding mechanism, and a static bin. The feeding belt is arranged in the first remediation bin. The first feeding port is arranged above the feeding belt to receive the contaminated soil to be remediated. The soil block breaking mechanism can be rotatably arranged in the first feeding port to break up the soil blocks in the contaminated soil so as to evenly lay them on the feeding belt. The first agent feeding mechanism is connected to the first remediation bin to drop the agent on the contaminated soil on the feeding belt. The static bin is located below one end of the feeding belt to receive the contaminated soil mixed with the agent and let it stand. The dynamic repair unit includes a second repair bin, a second feed port, an upper cavity, a lower cavity, a stirring and feeding mechanism, a screening hole, a second agent feeding mechanism, and a discharge port. The second feed port connected to the static bin is arranged at the top of the second repair bin, and the upper cavity and the lower cavity are arranged in the second repair bin from top to bottom in sequence. Several groups of stirring and feeding mechanisms are respectively arranged in the upper cavity and the lower cavity, and the stirring and feeding mechanism in the upper cavity is opposite to the stirring and feeding mechanism in the lower cavity. A plurality of groups of screening holes are arranged at the lower part of the rear part of the upper cavity away from the second feed port to form a screening body connected to the lower cavity, so as to screen the repaired soil in the upper cavity and make it fall into the lower cavity for secondary repair. The second agent feeding mechanism is respectively connected to the upper cavity and the lower cavity to place quicklime in the upper and lower cavities, and the discharge port is arranged at the bottom of the lower cavity. The stirring and feeding mechanism includes a stirring shaft, a stirring drive motor, a spiral stirring and feeding blade, a first stirring blade, and a second stirring blade. The stirring shaft is movably arranged in the upper cavity and the lower cavity. The spiral stirring and feeding blade is wound around the stirring shaft through a connecting rod, and a gap is arranged between the inner side of the spiral stirring and feeding blade and the stirring shaft. The first stirring blade with an arc structure is arranged on the outer periphery of the stirring shaft, and a plurality of second stirring blades are arranged between the spiral stirring and feeding blade and the first stirring blade. The stirring drive motor drives the spiral stirring and feeding blade, the first stirring blade and the second stirring blade to rotate in the cavity through the stirring shaft.

[0005] In a preferred embodiment of the present invention, a chamber door is provided on the end of the first repair chamber, and the loading feeder belt passes through the chamber door and extends outward to the dynamic repair unit.

[0006] In a preferred embodiment of the present invention, the soil block breaking mechanism includes a breaking roller, a crushing knife and a rotary drive motor. The breaking roller is horizontally arranged in the first feed port, and multiple groups of crushing knives are arranged on the breaking roller. The rotary drive motor drives the crushing knife to rotate in the first feed port through the breaking roller to break up the soil blocks.

[0007] In a preferred embodiment of the present invention, the first agent feeding mechanism includes a first agent bin for storing chemical warming agents and a first feeding port, and a plurality of groups of the first feeding ports are arranged above the feeding conveyor belt, and the first feeding ports are respectively connected to the first agent bins, so that the chemical warming agents are evenly covered on the contaminated soil through the first feeding ports.

[0008] In a preferred embodiment of the present invention, a material discharge gate is provided on the material discharge port.

[0009] In a preferred embodiment of the present invention, a feeding belt is provided in the second repair chamber, and the feeding belt is located below the feeding port to deliver the repaired soil.

[0010] In a preferred embodiment of the present invention, the second stirring blade is an arc-shaped structure, the outer end of the second stirring blade is an arc-shaped structure, and the diameter of the outer end is smaller than the diameter of the inner end.

[0011] In a preferred embodiment of the present invention, the second agent feeding mechanism includes a second agent bin for storing quicklime and a second feeding port, and a plurality of groups of the second feeding ports are provided at the top of the upper cavity and the upper part of the lower cavity. The second feeding ports are respectively connected to the second agent bin through feeding pipes so that quicklime can be fed into the cavity and fully mixed with the soil, and a control valve is provided on the feeding pipe.

[0012] In a preferred embodiment of the present invention, a heating and ventilation component is connected to the upper cavity and the lower cavity, and the heating and ventilation component includes a fan, a heater and an air supply pipe. The fan is provided on the heater, one end of the air supply pipe is connected to the fan, and the other end is connected to the upper part of the upper cavity and the lower cavity to deliver hot air into the cavity.

[0013] In a preferred embodiment of the present invention, the polluted gas collection mechanism includes an air outlet, an exhaust pipe, and an air collecting chamber. A plurality of the air outlets are arranged at the upper parts of the first repair chamber, the upper cavity and the lower cavity. The air outlets are connected to the air collecting chamber through the exhaust pipe, and the exhaust pipe is provided with the exhaust fan for discharging the volatilized organic pollutants into the air collecting chamber.

[0014] The beneficial effects of the present invention are: through the cooperation of multiple repair units, the volatilization of organic pollutants in contaminated soil is accelerated, the repair effect of contaminated soil is effectively improved, and the repair cycle is shortened, the repair efficiency is greatly improved, and the stability and adaptability are strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which: Figure 1 It is a structural schematic diagram of a preferred embodiment of a composite remediation treatment system for volatile organic polluted soil of the present invention; Figure 2It is a structural schematic diagram of a preferred embodiment of a composite remediation treatment system for volatile organic polluted soil of the present invention. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1-2 , the embodiment of the present invention includes: A composite remediation and treatment system for volatile organic polluted soil, the structure of which includes: a static remediation unit 1, a dynamic remediation unit 2, and a polluted gas collection mechanism. The dynamic remediation unit can be connected with a plurality of groups of static remediation units to receive the polluted soil sent from the static remediation units to improve work efficiency. The polluted gas collection mechanism is respectively connected with the static remediation unit and the dynamic remediation unit to extract the organic pollutants volatilized from the remediation unit for centralized treatment.

[0018] The static repair unit includes a first repair bin 10 , a feeding conveyor belt 11 , a first feed port 12 , a soil block breaking mechanism, a first agent feeding mechanism, and a static bin 16 .

[0019] The feeding belt is arranged at the bottom of the first remediation bin, and the first feeding port is arranged on the first remediation bin above the feeding belt to receive the contaminated soil to be remediated. The soil block breaking mechanism can be rotatably arranged in the first feeding port to break up the larger soil blocks in the contaminated soil so that they can be laid more evenly on the feeding belt. The first agent feeding mechanism is arranged on the remediation bin above the feeding belt, and the first agent feeding mechanism is arranged downstream of the crushing and leveling mechanism to spray / sprinkle quicklime on the contaminated soil on the feeding belt. The static bin is located below one end of the feeding belt to receive the contaminated soil mixed with the agent and let it stand.

[0020] Further preferably, a door is provided at the end of the first repair chamber, and the feeding conveyor belt passes through the door and extends outward to the dynamic repair unit. The first repair chamber may be made of a corrosion-resistant steel structure.

[0021] The soil block breaking mechanism includes a breaking roller 13, a crushing knife 14 and a rotary drive motor. The breaking roller is horizontally or vertically arranged in the first feed port, and a plurality of groups of crushing knives are arranged on the breaking roller. The output end of the rotary drive motor is connected to one end of the breaking roller to drive the crushing knife to rotate in the first feed port through the breaking roller to break up the soil blocks, which helps to improve the repair effect and efficiency.

[0022] The first agent feeding mechanism includes a first agent bin for storing chemical heating agents and a first feeding port 15. A plurality of first feeding ports are arranged above the feeding conveyor belt. The first feeding ports are respectively connected to the first agent bin, so that the chemical heating agents can be evenly covered on the contaminated soil through the first feeding ports. The chemical heating agent is quicklime.

[0023] During remediation, the contaminated soil is first put into the first feeding port, and the rotary drive motor is started to drive the crushing knife to rotate to break up the soil clods. The broken soil falls on the loading feeding belt, and the loading feeding belt loads and drives the contaminated soil to move downward; when the loading feeding belt is full of contaminated soil, the loading feeding belt stops moving, and the first feeding port puts quicklime on the contaminated soil; the loading feeding belt transports the contaminated soil mixed with quicklime to the static bin, so that the contaminated soil is piled in the static bin and left to stand for about 24 hours.

[0024] Quicklime is used to react chemically with water in contaminated soil to absorb moisture in the soil, reduce soil viscosity and particle size. At the same time, the chemical reaction releases heat and raises the temperature, which increases the saturated vapor pressure of the soil and promotes the volatilization of organic pollutants. When the input mass of quicklime is 3% of the mass of the contaminated soil (soil on the feed belt), the soil particle size, moisture content and heating efficiency are optimal.

[0025] The dynamic repair unit includes a second repair chamber 20 , a second feed port 21 , an upper cavity 22 , a lower cavity 23 , a stirring and feeding mechanism, screening holes 24 , a second medicine loading mechanism, and a feed port 25 .

[0026] The second feed port is arranged at the top of the second remediation bin and is connected with the static bin to receive the contaminated soil after the static reaction. The upper cavity and the lower cavity are arranged in the second remediation bin from top to bottom in sequence. Several groups of stirring and feeding mechanisms are respectively arranged in the upper cavity and the lower cavity, and the stirring and feeding mechanism in the upper cavity is opposite to the stirring and feeding mechanism in the lower cavity. A plurality of groups of screening holes are arranged at the lower part of the rear part of the upper cavity away from the second feed port to form a screen body connected with the lower cavity, so as to screen the soil in the upper cavity that has been repaired once, and the soil that meets the requirements will fall from the screening holes into the lower cavity for secondary repair. The second agent feeding mechanism is respectively connected with the upper cavity and the lower cavity to spray quicklime into the cavity, and the feed port is arranged at the bottom of the lower cavity.

[0027] Further preferably, a discharge gate 26 is provided on the discharge port.

[0028] Further preferably, a feeding belt 27 is provided in the second repair chamber, and the feeding belt is located below the feeding port to deliver the repaired soil.

[0029] The stirring and feeding mechanism includes a stirring shaft 28 , a stirring drive motor 29 , a spiral stirring and feeding blade 210 , a first stirring blade 211 , and a second stirring blade 212 .

[0030] The stirring shaft is movably arranged in the upper cavity and the lower cavity, the spiral stirring feeding blade is wound on the stirring shaft through a connecting rod, and a gap is arranged between the inner side of the spiral stirring feeding blade and the stirring shaft, the first stirring blade with an arc structure is arranged on the outer periphery of the stirring shaft, and a plurality of second stirring blades are arranged between the spiral stirring feeding blade and the first stirring blade, and the output end of the stirring drive motor is connected to the end of the stirring shaft to drive the stirring shaft to rotate in the cavity.

[0031] Further preferably, the edges of one or more structures of the spiral stirring and feeding blades, the first stirring blades, and the second stirring blades are configured as sharp blades, so as to improve the efficiency and effect of soil block crushing.

[0032] Further preferably, the second stirring blade can be arc-shaped or can be a linear structure, the diameter of its outer end is smaller than the diameter of its inner end (that is, its diameter increases from the outer end to the inner end), and the outer end of the second stirring blade is an arc-shaped structure, and the connection between its inner end and the stirring shaft is chamfered to prevent soil accumulation.

[0033] The second reagent feeding mechanism includes a second reagent bin for storing quicklime and a second feeding port 213. The top of the upper cavity and the upper part of the lower cavity are provided with a plurality of second feeding ports, which are respectively connected to the second reagent bin to feed quicklime into the cavity and fully mix it with the soil.

[0034] Further preferably, a second feeding port is also provided at the bottom of the second feeding port.

[0035] Further preferably, a heating and ventilation assembly is connected to the upper cavity and the lower cavity, and the heating and ventilation assembly includes a fan, a heater and an air supply duct. A fan is provided on the heater, one end of the air supply duct is connected to the fan, and the other end is connected to the upper part of the upper cavity and the lower cavity to deliver hot air into the cavity, thereby further improving the efficiency of the repair.

[0036] During the repair, the soil transported from the static bin in the static repair unit enters the upper cavity through the second feeding port, and quicklime is added through the second feeding port (at this time, the mass addition ratio of quicklime to soil is 2%). At the same time, the spiral stirring and feeding blades, the first stirring blades and the second stirring blades in the upper cavity cooperate to fully mix and stir the quicklime and soil to promote full contact between the quicklime and the soil, and transport the soil forward through the spiral stirring and feeding blades; after the soil and quicklime are fully in contact in the upper cavity, the particle size of the soil will be reduced to a preset threshold value, and enter the lower cavity from the upper cavity through the screening holes; similarly, the spiral stirring and feeding blades, the first stirring blades and the second stirring blades in the lower cavity cooperate to continue to stir and flip the soil and the quicklime put into the lower cavity, and start the heating and ventilation components to promote the volatilization of organic pollutants; when the repair is completed, the gate of the discharge port is opened, and the repaired soil falls from the discharge port onto the discharge feeding belt and is sent out.

[0037] Through the above method, 400-450 cubic meters of soil can be repaired in 24 hours, with significant efficiency and effect. The input mass of quicklime can be determined by calculating the total mass of soil treated once, and quicklime can be added according to the preset number of times or intervals.

[0038] The polluted gas collection mechanism includes an air outlet 3, an exhaust pipe, and an air collecting chamber. Multiple air outlets are arranged in the upper part of the first repair chamber, the upper cavity and the lower cavity. The air outlet is connected to the air collecting chamber through the exhaust pipe, and the exhaust pipe is provided with an exhaust fan for discharging the emitted organic pollutants into the air collecting chamber.

[0039] Further preferably, fresh air inlets are provided on the first repair chamber, the upper cavity and the lower cavity.

[0040] The beneficial effects of the composite remediation treatment system for volatile organic polluted soil of the present invention are: through the cooperation of multiple remediation units, the volatilization of organic pollutants in the contaminated soil is accelerated, the remediation effect of the contaminated soil is effectively improved, and the remediation cycle is shortened, the remediation efficiency is greatly improved, and the stability and adaptability are good.

[0041] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A composite remediation treatment system for volatile organic polluted soil, characterized in that: include: A static remediation unit, a dynamic remediation unit, and a polluted gas collection mechanism, wherein the dynamic remediation unit is connected to a plurality of groups of the static remediation units to receive the polluted soil sent from the static remediation units, and the polluted gas collection mechanism is respectively connected to the static remediation unit and the dynamic remediation unit to extract the organic pollutants volatilized from the remediation unit for centralized treatment; The static remediation unit comprises a first remediation bin, a feeding belt, a first feeding port, a soil block breaking mechanism, a first agent feeding mechanism, and a static bin. The feeding belt is arranged in the first remediation bin, and the first feeding port is arranged above the feeding belt to receive the contaminated soil to be remediated. The soil block breaking mechanism can be rotatably arranged in the first feeding port to break up the soil blocks in the contaminated soil so as to evenly lay them on the feeding belt. The first agent feeding mechanism is connected to the first remediation bin to drop the agent on the contaminated soil on the feeding belt. The static bin is located below one end of the feeding belt to receive the contaminated soil mixed with the agent and let it stand. The dynamic repair unit includes a second repair bin, a second feed port, an upper cavity, a lower cavity, a stirring and feeding mechanism, a screening hole, a second agent feeding mechanism, and a discharge port. The second feed port connected to the static bin is arranged at the top of the second repair bin, and the upper cavity and the lower cavity are arranged in the second repair bin from top to bottom in sequence. Several groups of stirring and feeding mechanisms are respectively arranged in the upper cavity and the lower cavity, and the stirring and feeding mechanism in the upper cavity is opposite to the stirring and feeding mechanism in the lower cavity. A plurality of groups of screening holes are arranged at the lower part of the rear part of the upper cavity away from the second feed port to form a screening body connected to the lower cavity, so as to screen the repaired soil in the upper cavity and make it fall into the lower cavity for secondary repair. The second agent feeding mechanism is respectively connected to the upper cavity and the lower cavity to place quicklime in the upper and lower cavities, and the discharge port is arranged at the bottom of the lower cavity. The stirring and feeding mechanism includes a stirring shaft, a stirring drive motor, a spiral stirring and feeding blade, a first stirring blade, and a second stirring blade. The stirring shaft is movably arranged in the upper cavity and the lower cavity. The spiral stirring and feeding blade is wound around the stirring shaft through a connecting rod, and a gap is arranged between the inner side of the spiral stirring and feeding blade and the stirring shaft. The first stirring blade with an arc structure is arranged on the outer periphery of the stirring shaft, and a plurality of second stirring blades are arranged between the spiral stirring and feeding blade and the first stirring blade. The stirring drive motor drives the spiral stirring and feeding blade, the first stirring blade and the second stirring blade to rotate in the cavity through the stirring shaft.

2. A composite remediation system for volatile organic polluted soil according to claim 1, characterized in that: A chamber door is provided on the end of the first repair chamber, and the loading and feeding belt passes through the chamber door and extends outward to the dynamic repair unit.

3. The composite remediation treatment system for volatile organic polluted soil according to claim 1 is characterized in that: The soil block breaking mechanism includes a breaking roller, a crushing knife and a rotary drive motor. The breaking roller is horizontally arranged in the first feed port, and a plurality of groups of crushing knives are arranged on the breaking roller. The rotary drive motor drives the crushing knife to rotate in the first feed port through the breaking roller to break up the soil blocks.

4. The composite remediation treatment system for volatile organic polluted soil according to claim 1 is characterized in that: The first agent feeding mechanism includes a first agent bin for storing chemical warming agents and a first feeding port. A plurality of groups of the first feeding ports are arranged above the feeding conveyor belt. The first feeding ports are respectively connected to the first agent bins, so that the chemical warming agents are evenly covered on the contaminated soil through the first feeding ports.

5. The composite remediation system for volatile organic polluted soil according to claim 1, characterized in that: A material discharge gate is arranged on the material discharge port.

6. The composite remediation system for volatile organic polluted soil according to claim 1, characterized in that: A feeding belt is provided in the second repair chamber, and the feeding belt is located below the feeding port to deliver the repaired soil.

7. The composite remediation system for volatile organic polluted soil according to claim 1, characterized in that: The second stirring blade is an arc-shaped structure, the outer end of the second stirring blade is an arc-shaped structure, and the diameter of the outer end is smaller than the diameter of the inner end.

8. The composite remediation system for volatile organic polluted soil according to claim 1, characterized in that: The second reagent feeding mechanism includes a second reagent bin for storing quicklime and a second feeding port. A plurality of groups of the second feeding ports are provided at the top of the upper cavity and the upper part of the lower cavity. The second feeding ports are respectively connected to the second reagent bin through feeding pipes so that quicklime can be fed into the cavity and fully mixed with the soil. A control valve is provided on the feeding pipe.

9. The composite remediation system for volatile organic polluted soil according to claim 1, characterized in that: The upper cavity and the lower cavity are connected with a heating and ventilation component, which includes a fan, a heater and an air supply pipe. The fan is arranged on the heater, one end of the air supply pipe is connected to the fan, and the other end is connected to the upper part of the upper cavity and the lower cavity to deliver hot air into the cavity.

10. The composite remediation system for volatile organic polluted soil according to claim 1, characterized in that: The polluted gas collection mechanism includes an air outlet, an exhaust pipe, and an air collecting chamber. The multiple air outlets are arranged in the upper part of the first repair chamber, the upper cavity and the lower cavity. The air outlet is connected to the air collecting chamber through the exhaust pipe, and the exhaust pipe is provided with the exhaust fan for discharging the volatilized organic pollutants into the air collecting chamber.

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