Remediation mechanism for polluted soil

Abstract

The utility model discloses a remediation mechanism for contaminated soil, including: static remediation unit, dynamic remediation unit, pollution gas collection mechanism, the dynamic remediation unit is connected with several groups of static remediation unit to receive the contaminated soil sent from the static remediation unit, 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. Through the mode, according to the remediation mechanism for the contaminated soil, volatilization of organic pollutants in the contaminated soil is accelerated through cooperation of the remediation units, the remediation effect of the contaminated soil is effectively improved, the remediation period is shortened, the remediation efficiency is greatly improved, and the remediation mechanism is good in stability and high in adaptability.

Description

Technical Field

[0001] This utility model relates to the field of environmental remediation technology, and in particular to a remediation mechanism for contaminated soil. Background Technology

[0002] Industrial plants such as pesticide factories, coking plants, and oil processing plants are causing increasingly severe organic pollution to the soil due to the volatile and semi-volatile organic compounds (VOCs) in their products. With changes in urban development plans and the relocation of these factories to new sites, there is an urgent need to remediate the soil pollution in these decommissioned sites to meet the requirements of the new development plans.

[0003] Chemical heating soil remediation processes use chemical agents to heat the soil, promoting the volatilization of organic pollutants. However, existing chemical heating processes require large amounts of chemical heating agents to achieve the desired treatment effect, which not only increases soil remediation costs but may also lead to the formation of more toxic byproducts, making it difficult to meet the requirements of green and energy-saving production. Mechanical ventilation soil remediation processes utilize mechanical disturbance of the soil while enhancing convection ventilation, increasing the contact between organic pollutants and air through physical action to promote the volatilization of organic pollutants. However, in practical applications, when the contaminated soil particles are large and sticky, simply using mechanical ventilation can lead to excessively high concentrations of pollutants remaining in the soil, failing to meet the site's pollution target values. Utility Model Content

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A soil remediation mechanism is provided, comprising: a static remediation unit, a dynamic remediation unit, and a pollutant gas collection mechanism. The dynamic remediation unit is connected to several sets of the static remediation units to receive the polluted soil delivered from the static remediation units. The pollutant gas collection mechanism is connected to both the static remediation units and the dynamic remediation units to extract the volatile organic pollutants emitted from the remediation units for centralized treatment.

[0006] The static remediation unit includes a first remediation chamber, a feeding belt, a first inlet, a soil clod breaking mechanism, a first chemical feeding mechanism, and a settling chamber. The feeding belt is located inside the first remediation chamber, and the first inlet is located above the feeding belt to receive the contaminated soil to be remediated. The soil clod breaking mechanism is rotatably located inside the first inlet to break up the soil clods in the contaminated soil and spread them evenly on the feeding belt. The first chemical feeding mechanism is connected to the first remediation chamber to deliver chemicals onto the contaminated soil on the feeding belt. The settling chamber is located below one end of the feeding belt to receive the contaminated soil mixed with chemicals and set it still.

[0007] The dynamic remediation unit includes a second remediation chamber, a second inlet, an upper cavity, a lower cavity, a mixing and feeding mechanism, screening holes, a second agent feeding mechanism, and a discharge port. The second inlet, which is connected to the settling chamber, is located at the top of the second remediation chamber. The upper cavity and the lower cavity are arranged sequentially from top to bottom within the second remediation chamber. Each of the upper and lower cavities is provided with several sets of the mixing and feeding mechanism, and the mixing and feeding mechanism in the upper cavity is opposite in direction to the mixing and feeding mechanism in the lower cavity. The lower part of the rear of the upper cavity, away from the second inlet, is provided with multiple sets of screening holes to form a screening body connected to the lower cavity, thereby screening the remediated soil in the upper cavity and causing it to fall into the lower cavity for secondary remediation. The second agent feeding mechanism is connected to both the upper cavity and the lower cavity to place quicklime into the upper and lower cavities. The discharge port is located at the bottom of the lower cavity.

[0008] The mixing and feeding mechanism includes a mixing shaft, a mixing drive motor, a spiral mixing and feeding blade, a first mixing plate, and a second mixing plate. The mixing shaft is movably disposed within the upper cavity and the lower cavity. The spiral mixing and feeding blade is wound around the mixing shaft via a connecting rod, and a gap is provided between the inner side of the spiral mixing and feeding blade and the mixing shaft. The arc-shaped first mixing plate is disposed on the outer periphery of the mixing shaft, and multiple second mixing plates are disposed between the spiral mixing and feeding blade and the first mixing plate. The mixing drive motor drives the spiral mixing and feeding blade, the first mixing plate, and the second mixing plate to rotate within the cavity via the mixing shaft.

[0009] In a preferred embodiment of the present invention, a door is provided at the end of the first repair chamber, and the feeding conveyor belt extends outward through the door to the dynamic repair unit.

[0010] In a preferred embodiment of the present invention, the soil clod breaking mechanism includes a breaking roller, a crushing blade, and a rotary drive motor. The breaking roller is horizontally arranged in the first feed inlet, and multiple sets of the crushing blades are arranged on the breaking roller. The rotary drive motor drives the crushing blades to rotate in the first feed inlet through the breaking roller to break up the soil clods.

[0011] In a preferred embodiment of the present invention, the first agent feeding mechanism includes a first agent bin for storing chemical heating agent and a first feeding port. Multiple sets of the first feeding ports are provided above the feeding conveyor belt. The first feeding ports are respectively connected to the first agent bin, so that the chemical heating agent is evenly covered on the contaminated soil through the first feeding ports.

[0012] In a preferred embodiment of this utility model, a discharge gate is provided on the discharge port.

[0013] In a preferred embodiment of this utility model, a feeding belt is provided inside the second repair chamber, and the feeding belt is located below the discharge port to deliver the repaired soil.

[0014] In a preferred embodiment of the present invention, the second stirring blade has an arc-shaped structure, the outer end of the second stirring blade has a circular arc-shaped structure, and the diameter of its outer end is smaller than the diameter of its inner end.

[0015] 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. Multiple sets 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 a feeding pipe to feed quicklime into the cavity and mix it thoroughly with the soil. A control valve is provided on the feeding pipe.

[0016] In a preferred embodiment of the present invention, a heating and ventilation assembly is connected to the upper cavity and the lower cavity. The heating and ventilation assembly includes a fan, a heater and an air supply pipe. The fan is installed 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 send hot air into the cavity.

[0017] In a preferred embodiment of the present invention, the pollutant gas collection mechanism includes an air outlet, an exhaust pipe, and a gas collection chamber. A plurality of air outlets are disposed on the upper part of the first repair chamber, the upper cavity, and the lower cavity. The air outlets are connected to the gas collection chamber through the exhaust pipe, and the exhaust pipe is provided with an exhaust fan for discharging the volatilized organic pollutants to the gas collection chamber.

[0018] The beneficial effects of this invention are: through the cooperation of multiple remediation units, the volatilization of organic pollutants in contaminated soil is accelerated, effectively improving the remediation effect of contaminated soil, shortening the remediation cycle, greatly improving the remediation efficiency, and exhibiting good stability and strong adaptability. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0020] Figure 1 This is a schematic diagram of a preferred embodiment of a soil remediation mechanism according to the present invention;

[0021] Figure 2 This is a schematic diagram of a preferred embodiment of a soil remediation mechanism according to the present invention. Detailed Implementation

[0022] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] Please see Figure 1-2 The embodiments of this utility model include:

[0024] A soil remediation mechanism includes: a static remediation unit 1, a dynamic remediation unit 2, and a pollutant gas collection mechanism. The dynamic remediation unit can be connected to several sets of static remediation units to receive the polluted soil from the static remediation units, thereby improving work efficiency. The pollutant gas collection mechanism is connected to both the static and dynamic remediation units to extract the volatile organic pollutants emitted from the remediation units for centralized treatment.

[0025] The static repair unit includes a first repair chamber 10, a feeding conveyor belt 11, a first inlet 12, a soil clod breaking mechanism, a first chemical feeding mechanism, and a static chamber 16.

[0026] A feeding belt is located at the bottom of the first remediation chamber, and a first inlet is located on the first remediation chamber above the feeding belt to receive the contaminated soil to be remediated. A soil clod breaking mechanism is rotatably installed inside the first inlet to break up larger soil clods in the contaminated soil so that they can be spread more evenly on the feeding belt. A first chemical feeding mechanism is located on the remediation chamber above the feeding belt and downstream of the crushing and leveling mechanism to spray / spread quicklime on the contaminated soil on the feeding belt. The settling chamber is located below one end of the feeding belt to receive the contaminated soil mixed with chemicals and set it still.

[0027] Preferably, the first repair chamber has a door at one end, and the feeding belt extends outward through the door to the dynamic repair unit. The first repair chamber can be constructed of corrosion-resistant steel.

[0028] The soil clod breaking mechanism includes a breaking roller 13, a crushing blade 14, and a rotary drive motor. The breaking roller is horizontally or vertically arranged in the first feed inlet, and multiple sets of crushing blades are arranged on the breaking roller. The output end of the rotary drive motor is connected to one end of the breaking roller, so that the breaking blade can be driven to rotate in the first feed inlet through the breaking roller to break up the soil clod, which helps to improve the effect and efficiency of the repair.

[0029] The first agent feeding mechanism includes a first agent bin for storing the chemical heating agent and a first feeding port 15. Multiple sets of first feeding ports are located above the feeding conveyor belt, each connected to the first agent bin, allowing the chemical heating agent to be evenly distributed onto the contaminated soil through the first feeding ports. The chemical heating agent used is quicklime.

[0030] During the remediation process, the contaminated soil is first fed into the first inlet. The rotary drive motor is started, which drives the crusher blades to rotate and break up the soil clods. The broken soil falls onto the feeding belt, which carries the contaminated soil and moves it downwards. When the feeding belt is full of contaminated soil, it stops moving, and quicklime is added to the contaminated soil from the first feeding port. The feeding belt then transports the contaminated soil mixed with quicklime to the settling chamber, where it is left to stand for about 24 hours.

[0031] Quicklime reacts chemically with water in contaminated soil to absorb moisture, reduce soil viscosity and particle size. At the same time, the chemical reaction releases heat and raises the temperature, increasing the saturated vapor pressure of the soil and promoting the volatilization of organic pollutants. When the mass of quicklime added is 3% of the mass of the contaminated soil (soil on the feeding belt), the soil particle size, moisture content and heating efficiency are optimal.

[0032] The dynamic repair unit includes a second repair chamber 20, a second feed inlet 21, an upper cavity 22, a lower cavity 23, a stirring and feeding mechanism, a sieve hole 24, a second agent feeding mechanism, and a discharge port 25.

[0033] The second feed inlet is located at the top of the second remediation chamber and is connected to the settling chamber to receive contaminated soil after settling reaction. The upper and lower chambers are arranged sequentially from top to bottom in the second remediation chamber. Several sets of mixing and feeding mechanisms are provided in both the upper and lower chambers, and the mixing and feeding mechanisms in the upper chamber are opposite in direction to those in the lower chamber. Multiple sets of screening holes are provided in the lower part of the rear of the upper chamber away from the second feed inlet to form a sieve body connected to the lower chamber, thereby screening the soil in the upper chamber that has undergone one remediation. Soil that meets the requirements will fall from the screening holes into the lower chamber for secondary remediation. The second agent feeding mechanism is connected to both the upper and lower chambers to spray quicklime into the chambers. The discharge port is located at the bottom of the lower chamber.

[0034] In a further preferred embodiment, a discharge gate 26 is provided on the discharge port.

[0035] In a further preferred embodiment, the second repair chamber is equipped with a feeding belt 27, which is located below the discharge port to deliver the repaired soil.

[0036] The mixing and feeding mechanism includes a mixing shaft 28, a mixing drive motor 29, a spiral mixing and feeding blade 210, a first mixing blade 211, and a second mixing blade 212.

[0037] The stirring shaft is movably disposed within the upper and lower cavities. The spiral stirring and feeding blades are wound around the stirring shaft via connecting rods, and a gap is provided between the inner side of the spiral stirring and feeding blades and the stirring shaft. The first stirring blade with an arc-shaped structure is disposed on the outer periphery of the stirring shaft. Multiple second stirring blades are disposed between the spiral stirring and feeding blades and the first stirring blades. The output end of the stirring drive motor is connected to the end of the stirring shaft to drive the stirring shaft to rotate within the cavity.

[0038] In a further preferred embodiment, the edges of one or more of the spiral mixing feed blades, the first mixing blade, and the second mixing blade are set as sharp blades to improve the efficiency and effectiveness of soil clod crushing.

[0039] More preferably, the second stirring plate can be arc-shaped or straight-line structure, with the diameter of its outer end being smaller than the diameter of its inner end (i.e., its diameter increases sequentially from the outer end to the inner end), and the outer end of the second stirring plate is an arc-shaped structure, with a rounded chamfer at the connection between its inner end and the stirring shaft to prevent soil accumulation.

[0040] The second agent feeding mechanism includes a second agent bin for storing quicklime and a second feeding port 213. Multiple sets of second feeding ports are provided on the top of the upper cavity and the upper part of the lower cavity. The second feeding ports are connected to the second agent bin to feed quicklime into the cavity and mix it thoroughly with the soil.

[0041] Further preferably, a second feeding port is also provided at the bottom of the second feeding port.

[0042] In a further preferred embodiment, a heating and ventilation assembly is connected to the upper cavity and the lower cavity. The heating and ventilation assembly includes a fan, a heater, and an air supply pipe. The heater is equipped with a fan, and one end of the air supply pipe is connected to the fan, while 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.

[0043] During the remediation process, soil from the static remediation unit's settling chamber enters the upper chamber through the second inlet, while quicklime is added through the second feeding port (at this point, the ratio of quicklime to soil mass is 2%). Simultaneously, the spiral mixing blades, first mixing plate, and second mixing plate in the upper chamber work together to thoroughly mix the quicklime and soil, promoting full contact between them. The spiral mixing blades then transport the soil forward. After the soil and quicklime have made sufficient contact in the upper chamber, the soil particle size decreases to a preset threshold and passes through the screening holes into the lower chamber. Similarly, the spiral mixing blades, first mixing plate, and second mixing plate in the lower chamber continue to mix and turn the soil and quicklime added to the lower chamber, while the heating and ventilation components are activated to promote the volatilization of organic pollutants. Once the remediation is complete, the gate at the discharge port opens, and the remediated soil falls from the discharge port onto the feeding belt and is then discharged.

[0044] Using the above method, 400-450 cubic meters of soil can be repaired within 24 hours, demonstrating significant efficiency and effectiveness. The required amount of quicklime can be determined by calculating the total mass of soil treated in a single operation, and the quicklime can be added according to a pre-set number of times or intervals.

[0045] The pollutant gas collection mechanism includes an air outlet 3, an exhaust pipe, and a gas collection chamber. Multiple air outlets are located at the top of the first repair chamber, the upper cavity, and the lower cavity. The air outlets are connected to the gas collection chamber through the exhaust pipe, and an exhaust fan is installed on the exhaust pipe to discharge the emitted organic pollutants into the gas collection chamber.

[0046] In a further preferred embodiment, fresh air inlets are provided on the first repair chamber, the upper cavity, and the lower cavity.

[0047] The beneficial effects of this utility model for a soil remediation mechanism are: through the cooperation of multiple remediation units, the volatilization of organic pollutants in the soil is accelerated, effectively improving the remediation effect of the soil, shortening the remediation cycle, greatly improving the remediation efficiency, and exhibiting good stability and strong adaptability.

[0048] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A remediation mechanism for contaminated soil, characterized in that, include: The system includes a static remediation unit, a dynamic remediation unit, and a pollutant gas collection mechanism. The dynamic remediation unit is connected to several sets of the static remediation units to receive contaminated soil from the static remediation units. The pollutant gas collection mechanism is connected to both the static remediation units and the dynamic remediation units to extract the volatile organic pollutants emitted from the remediation units for centralized treatment. The static remediation unit includes a first remediation chamber, a feeding belt, a first inlet, a soil clod breaking mechanism, a first chemical feeding mechanism, and a settling chamber. The feeding belt is located inside the first remediation chamber, and the first inlet is located above the feeding belt to receive the contaminated soil to be remediated. The soil clod breaking mechanism is rotatably located inside the first inlet to break up the soil clods in the contaminated soil and spread them evenly on the feeding belt. The first chemical feeding mechanism is connected to the first remediation chamber to deliver chemicals onto the contaminated soil on the feeding belt. The settling chamber is located below one end of the feeding belt to receive the contaminated soil mixed with chemicals and set it still. The dynamic remediation unit includes a second remediation chamber, a second inlet, an upper cavity, a lower cavity, a mixing and feeding mechanism, screening holes, a second agent feeding mechanism, and a discharge port. The second inlet, which is connected to the settling chamber, is located at the top of the second remediation chamber. The upper cavity and the lower cavity are arranged sequentially from top to bottom within the second remediation chamber. Each of the upper and lower cavities is provided with several sets of the mixing and feeding mechanism, and the mixing and feeding mechanism in the upper cavity is opposite in direction to the mixing and feeding mechanism in the lower cavity. The lower part of the rear of the upper cavity, away from the second inlet, is provided with multiple sets of screening holes to form a screening body connected to the lower cavity, thereby screening the remediated soil in the upper cavity and causing it to fall into the lower cavity for secondary remediation. The second agent feeding mechanism is connected to both the upper cavity and the lower cavity to place quicklime into the upper and lower cavities. The discharge port is located at the bottom of the lower cavity. The mixing and feeding mechanism includes a mixing shaft, a mixing drive motor, a spiral mixing and feeding blade, a first mixing plate, and a second mixing plate. The mixing shaft is movably disposed within the upper cavity and the lower cavity. The spiral mixing and feeding blade is wound around the mixing shaft via a connecting rod, and a gap is provided between the inner side of the spiral mixing and feeding blade and the mixing shaft. The arc-shaped first mixing plate is disposed on the outer periphery of the mixing shaft, and multiple second mixing plates are disposed between the spiral mixing and feeding blade and the first mixing plate. The mixing drive motor drives the spiral mixing and feeding blade, the first mixing plate, and the second mixing plate to rotate within the cavity via the mixing shaft.

2. The soil remediation apparatus according to claim 1, characterized in that, The first repair chamber is provided with a door at its end, and the feeding conveyor belt extends outward through the door to the dynamic repair unit.

3. The soil remediation apparatus according to claim 1, characterized in that, The soil clod breaking mechanism includes a breaking roller, a crushing blade, and a rotary drive motor. The breaking roller is horizontally positioned inside the first feed inlet, and multiple sets of crushing blades are mounted on the breaking roller. The rotary drive motor drives the crushing blades to rotate inside the first feed inlet via the breaking roller to break up the soil clods.

4. A soil remediation apparatus according to claim 1, characterized in that, The first agent feeding mechanism includes a first agent bin for storing chemical heating agent and a first feeding port. Multiple sets of the first feeding ports are provided above the feeding conveyor belt. The first feeding ports are respectively connected to the first agent bin, so that the chemical heating agent is evenly covered on the contaminated soil through the first feeding ports.

5. A soil remediation apparatus according to claim 1, characterized in that, A discharge gate is provided on the discharge port.

6. A soil remediation apparatus according to claim 1, characterized in that, The second repair chamber is equipped with a feeding belt located below the discharge port to deliver the repaired soil.

7. A soil remediation apparatus according to claim 1, characterized in that, The second stirring blade has an arc-shaped structure, and the outer end of the second stirring blade has a circular arc-shaped structure, with the diameter of the outer end being smaller than the diameter of the inner end.

8. A soil remediation apparatus according to claim 1, characterized in that, The second agent feeding mechanism includes a second agent bin for storing quicklime and a second feeding port. Multiple sets 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 to put quicklime into the cavity and mix it thoroughly with the soil. A control valve is provided on the feeding pipe.

9. A soil remediation apparatus according to claim 1, characterized in that, A heating and ventilation assembly is connected to the upper cavity and the lower cavity. The heating and ventilation assembly includes a fan, a heater and an air supply pipe. The fan is installed 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 send hot air into the cavity.

10. A soil remediation apparatus according to claim 1, characterized in that, The pollutant gas collection mechanism includes an air outlet, an exhaust pipe, and a gas collection chamber. Multiple air outlets are located at the upper part of the first repair chamber, the upper cavity, and the lower cavity. The air outlets are connected to the gas collection chamber through the exhaust pipe, and an exhaust fan is installed on the exhaust pipe to discharge the volatile organic pollutants to the gas collection chamber.

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