A screening and dosing reaction device for chemical oxidation remediation of contaminated soil

Abstract

The present invention discloses a screening and dosing reaction device for chemical oxidation remediation of contaminated soil, comprising a feeding hopper, a vibrating rotating seat, a conveying mechanism, a dosing reaction box, a rotating mace device, and a drug adding mechanism, wherein the conveying mechanism comprises an upper conveying mechanism and a lower conveying mechanism, and the drug adding mechanism comprises a solid drug adding mechanism and a liquid drug adding mechanism. The present invention effectively combines the screening, dosing and mixing and stirring devices of contaminated soil, and reduces the risk of explosion caused by the concentrated generation of a large amount of gas during the reaction process by setting a good gas passage. According to different types of contaminated soil, different types and concentrations of remediation agents can be used to quickly remediate the contaminated soil. The present invention is applicable to the treatment of soil contaminated by heavy metals and organic matter, has a reasonable structural layout, a wide range of applications, a fast reaction speed, good flexibility, safe and stable operation, and is economically feasible.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection equipment, and in particular to a screening and dosing reaction device for chemical oxidation remediation of contaminated soil. Background Art

[0002] With the advancement of industrial restructuring and capacity elimination in the chemical, steel, coal, coking, petroleum and other industries, a number of production capacities with high pollution, high emissions and low environmental protection technology levels have been abolished. More and more industries and enterprises have moved from urban areas to industrial parks or urban suburbs, leaving behind large areas of organic pollution sites. These organic pollutants are highly toxic and easy to spread, which seriously threaten the surrounding environment, the health of residents and the reuse of land. With the advancement of the domestic modernization process, the rapid development and expansion of urbanization, and the growing demand for construction land, there is an urgent need to take rapid and efficient governance measures for such sites.

[0003] Combined with the applicability of soil remediation technology, site pollution characteristics, pollutant conditions, final remediation target values, site hydrogeological conditions, site later development requirements, etc., the commonly used remediation technologies for contaminated soil in China were screened. Due to the urgent time for site redevelopment, the time required for the installation and commissioning of thermal desorption equipment is difficult to meet the requirements of the on-site construction period; the pollution depth is shallow and the pollution concentration in some areas is high, and in-situ chemical oxidation is prone to rebound; considering its cost and the characteristics of pollutants, cost and construction period factors, ex-situ chemical oxidation remediation technology can reflect the advantages of short construction period and low cost.

[0004] Chemical oxidation remediation technology is effective for most organic pollutants. The process is mature and easy to operate, and the remediation cycle is short. It has been widely studied and gradually applied in engineering practice. However, it has limitations for the remediation of high-concentration organic contaminated soil. The amount of agent added is large, the contact reaction time between contaminated soil and chemical oxidizing agents is too short, and the particles are large and difficult to mix evenly, making it difficult to achieve the remediation goal. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a screening and dosing reaction device for chemical oxidation remediation of contaminated soil with a reasonable structure, which avoids large particles that are difficult to mix evenly and incomplete treatment reactions during the treatment of contaminated soil.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is: a screening and dosing reaction device for chemical oxidation remediation of contaminated soil, comprising a feeding hopper, a vibrating rotating seat, a conveying mechanism, a dosing reaction box, a rotating mace device, and a drug adding mechanism, the conveying mechanism comprises an upper conveying mechanism and a lower conveying mechanism, the drug adding mechanism comprises a solid drug adding mechanism and a liquid drug adding mechanism, the feeding hopper comprises a vibrating rotating seat and an upper conveying mechanism from top to bottom, the rotation direction of the vibrating rotating seat is counterclockwise, and the distance between the surfaces of the vibrating axes is 5 cm. During operation, materials larger than 5 cm are vibrated to the upper conveying mechanism, and materials smaller than 5 cm fall vertically. A drop port connected to the dosing reaction box is opened on the bottom surface, and an opening is provided on the top of the dosing reaction box. The feeding hopper is arranged at the opening of the rotating mace. At the upper end, a sealing plate for opening or closing the opening is provided at the bottom of the feeding hopper, a rotatable rotating mace is provided in the rotating mace device, the rotating mace is vertically arranged, the solid medicine adding mechanism is fixed to the dosing reaction box and is located on both sides above the rotating mace, the left and right sides of the dosing reaction box are provided with a liquid medicine adding mechanism, the bottom of the dosing reaction box is provided with a movable valve drop port, a lower conveying mechanism connected to the dosing reaction box, the upper end opening of the dosing reaction box is arranged below the vibrating rotating seat, the vibrating rotating seat is provided with a vibrating power device corresponding to the dosing reaction box, the bottom of the vibrating rotating seat is provided with a walking pulley, and the vibrating rotating seat can drive large-size materials to be transferred to the upper conveying mechanism during the walking process, and small-size materials enter the dosing reaction box.

[0007] The present invention uses a feeding hopper and a vibrating rotating seat on the upper part of a dosing reaction box to perform rotational crushing and screening of the contaminated soil. The counterclockwise rotation is performed through a rotating shaft with gears. The dosing mechanism of the dosing reaction box enters at a certain rate after the blanking port is sealed, which can ensure a stable supply of solid and liquid agents. According to different soil types, the power rotary stirring or static treatment method can be flexibly selected to ensure full contact between the agent and the contaminated soil and improve the reaction efficiency between the agent and the pollutant. The contaminated soil after the rotary mace dosing and stirring falls into the conveying mechanism from the blanking port at the bottom of the dosing reaction box. The movable valve at the blanking port at the bottom of the dosing reaction box can be flexibly drawn out and placed in the dosing reaction box frame.

[0008] The waste gas generated during the chemical oxidation treatment of contaminated soil is extracted from the waste gas outlet of the upper box of the dosing reaction box through the tail gas treatment system. The chemicals react with the pollutants in the contaminated soil to change the state of the pollutants in the soil and make them harmless, thereby achieving rapid remediation of the contaminated soil. The contaminated soil after chemical oxidation treatment is placed in the dosing reaction box, falls into the conveying mechanism from the drop port at the bottom of the dosing reaction box, and is removed for final disposal.

[0009] Furthermore, when the material is added to the dosing reaction box to 3 / 4 of its volume, the upper opening of the dosing reaction box is sealed and connected to the material discharge port at the lower end of the feeding hopper.

[0010] Furthermore, the drug adding reaction box is movably connected to the rotating mace, and the bottom of the rotating mace is connected to a reduction motor.

[0011] Furthermore, the solid medicine adding mechanism is a dosing nozzle suspended on the top wall of the dosing reaction box, and two dosing nozzles are provided, and the two dosing nozzles are arranged at intervals along the length direction of the rotating mace.

[0012] Furthermore, the medicine liquid adding mechanism is a medicine dosing nozzle suspended on the left and right sides of the medicine dosing reaction box. There are two medicine dosing nozzles, and the lengths of the two medicine dosing nozzles are set according to the distance of the rotating mace.

[0013] Furthermore, the dosing reaction box is enclosed by a top plate, a bottom plate, and a circular baffle to form a cylindrical shape, and reinforcement columns are provided at the same distance around the dosing reaction box.

[0014] Furthermore, the length of the rotating shaft of the vibration rotating seat is gradually shortened according to the vibration effect and the climbing height of the material, so that the large-size materials are concentrated to the upper conveying mechanism.

[0015] Furthermore, the rotating mace is provided with a plurality of rows of mace, and the lengths of the plurality of rows of mace are arranged at intervals according to the height of the rotating mace.

[0016] The advantages of the present invention compared with the prior art are:

[0017] 1. The present invention effectively combines the screening, dosing and mixing and stirring devices for contaminated soil, and reduces the risk of explosion caused by the concentrated generation of a large amount of gas during the reaction process by setting up a good gas passage. Stirring and repairing are carried out in a closed device to solve the problems of harmful gas leakage and dust during the treatment of contaminated soil. The new mechanical + vibration mixing process solves the problems of difficulty in screening soils of different particle sizes, too short contact reaction time between the agent and the contaminated soil, and uniform mixing. In summary, the present invention is safe, environmentally friendly and can fully guarantee the treatment effect. By providing a movable valve for the drop port that can be pulled out flexibly, the treated soil can be flexibly removed from the dosing reaction box, thereby improving the treatment efficiency.

[0018] 2. The present invention can use different types and concentrations of remediation agents to quickly remediate contaminated soil according to different types of contaminated soil, and is applicable to the treatment of soil contaminated by heavy metals and organic matter.

[0019] 3. The present invention has a reasonable structure and layout, a wide range of applications, fast response speed, good flexibility, safe and stable operation, and economic feasibility. It can be set up in a polluted site for on-site ex-situ remediation of the polluted site, reducing the transfer volume of earth-moving machinery and reducing operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the main structure of the device of the present invention.

[0021] Figure 2 It is a side structural schematic diagram of the device of the present invention.

[0022] Figure 3 It is a schematic diagram of the top structure of the device of the present invention.

[0023] As shown in the figure: 1. Feeding hopper; 2. Vibrating rotating seat; 3. Upper conveying mechanism; 4. Solid medicine adding mechanism; 5. Liquid medicine adding mechanism; 6. Rotating mace; 7. Lower conveying mechanism; 8. Dosing reaction box. DETAILED DESCRIPTION

[0024] In the description of the present invention, it should be understood that the terms "center", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In addition, the term "including" and any variation thereof are intended to cover non-exclusive inclusions.

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0026] like Figure 1 and Figure 2 As shown, the dosing reaction device for chemical oxidation remediation of contaminated soil in this embodiment includes a feeding hopper 1, a vibrating rotating seat 2, a rotating mace 6, a dosing reaction box 8, a conveying mechanism and a drug adding mechanism, wherein the conveying mechanism includes an upper conveying mechanism 3 and a lower conveying mechanism 7, and the drug adding mechanism includes a solid drug adding mechanism 4 and a drug liquid adding mechanism 5.

[0027] The feeding hopper 1 includes a vibrating rotating seat 2 and an upper conveying mechanism 3 from top to bottom. The length of the rotating shaft of the vibrating rotating seat 2 is gradually shortened according to the vibration effect and the climbing height of the material, and the large-size material is concentrated to the upper conveying mechanism 3, and the small-size material is vibrated to fall into the dosing reaction box 8; the rotation direction of the vibrating rotating seat 2 is counterclockwise, and the distance between the surfaces of the vibration shafts is 5cm. During operation, the material larger than 5cm is vibrated to the upper conveying mechanism 3, and the material smaller than 5cm falls vertically. The bottom surface is provided with a drop opening connected to the dosing reaction box 8. The dosing reaction box 8 is surrounded by a top plate, a bottom plate, and a circular baffle to form a cylindrical shape, and reinforcement columns are provided at the same distance around. The top of the dosing reaction box 8 is provided with an opening, and a sealing plate for opening or closing the opening is provided to ensure the airtightness of the entire reaction process when no soil enters. The rotating mace 6 is arranged vertically, and multiple rows of maces are arranged on the rotating mace 6. The lengths of the multiple rows of maces are arranged according to the height intervals of the rotating mace 6. The solid medicine adding mechanism 4 is suspended on the medicine adding reaction box 8 and is located on both sides above the rotating mace 6. The medicine adding mechanism 5 is arranged on the left and right sides of the medicine adding reaction box 8; the bottom of the medicine adding reaction box 8 is provided with a movable valve drop opening, and the lower conveying mechanism 7 is connected with the medicine adding reaction box 8 to facilitate material transfer.

[0028] In this embodiment, the top area of ​​the hopper 1 is 50m 2 , height is 3m: the inclination angle of the vibration rotating seat is 30°, 10 rotating shafts are assembled, all of which vibrate and rotate counterclockwise, the diameter of the vibration shaft is 20cm, the longest vibration shaft length is 8m, and the shortest is 4m. The size settings of the feeding hopper 1 and the vibration rotating seat 2 can be adjusted according to actual engineering needs.

[0029] The dosing reaction box 8 is arranged under the vibration rotating seat 2 and is movably connected to the vibration rotating seat 2. The front and rear sides of the dosing reaction box 8 are provided with lifting ears to facilitate the lifting of the dosing reaction box 8. Walking pulleys are provided on both sides of the vibration rotating seat 2. The vibration rotating seat 2 is provided with a motor for driving the vibration rotating seat 2 to slide. During the walking process of the vibration rotating seat 2, large particles of materials can be driven to move out from the upper conveying mechanism 3, and small particles of materials can be dropped into the dosing reaction box 8 through vibration. The upper end of the dosing reaction box 8 is open, and the upper end opening of the dosing reaction box 8 is movably connected to the blanking port at the bottom of the feeding hopper 1. The blanking port at the bottom of the feeding hopper 1 can be provided with a sealing plate for opening or closing the opening of the dosing reaction box 8, so that a tight closure is achieved during the dosing reaction. After the reaction of the contaminated soil is completed, the entire transport is carried out by hoisting equipment.

[0030] The rotating mace 6 is provided with a rotating power device, and the dosing reaction box 8 is driven by the power device of the oscillating transmission base. Dynamic or static treatment methods can be flexibly selected for different types of contaminated soil treatment, effectively preventing the contaminated soil from becoming hardened during the chemical oxidation process. The bottom of the dosing reaction box 8 is provided with a drop port movable valve, which is connected to the lower transmission mechanism 7 to meet the requirements of rapid transfer and maintenance of the soil after dosing, improve treatment efficiency, and save treatment costs.

[0031] By passing the agent through the two solid agent nozzles and two liquid agent nozzles on the left and right sides of the dosing reaction box 8, the agent is sprayed into the contaminated soil in the dosing reaction box 8 at a certain rate, so as to ensure the stable supply of the agent, increase the contact area between the agent and the pollutant, ensure the full contact between the agent and the contaminated soil, and improve the reaction efficiency between the agent and the pollutant. The movable closing plate between the feeding hopper 1 and the dosing reaction box 8 can ensure the airtightness of the entire dosing reaction device. The contaminated soil after dosing is rotated, stirred and mixed by the rotating mace 6 in the dosing reaction box 8 to react. By reacting the agent with the pollutants in the contaminated soil, the occurrence state of the pollutants in the soil is changed to make them harmless, thereby realizing the rapid remediation of the contaminated soil.

[0032] The contaminated soil after chemical oxidation treatment is placed in a dosing reaction box 8. The bottom of the dosing reaction box 8 is provided with a drop opening movable valve, which is connected to the lower conveying mechanism 7 to achieve soil transfer and maintenance for final disposal. The waste gas generated during the treatment is discharged from the dosing reaction device and connected to an external tail gas system for treatment.

[0033] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A screening and dosing reaction device for chemical oxidation remediation of contaminated soil, characterized by: The invention comprises a feeding hopper (1), a vibrating rotating seat (2), a conveying mechanism, a dosing reaction box (8), a rotating mace device, and a medicine adding mechanism. The conveying mechanism comprises an upper conveying mechanism (3) and a lower conveying mechanism (7). The medicine adding mechanism comprises a solid medicine adding mechanism (4) and a liquid medicine adding mechanism (5). The feeding hopper (1) comprises a vibrating rotating seat (2) and an upper conveying mechanism (3) from top to bottom. The rotation direction of the vibrating rotating seat (2) is counterclockwise. The distance between the surfaces of the vibrating axes is 5 cm. During operation, materials larger than 5 cm are vibrated to the upper conveying mechanism (3), and materials smaller than 5 cm fall vertically. A material drop port connected to the dosing reaction box (8) is provided on the bottom surface. The top of the dosing reaction box (8) is provided with an opening. The feeding hopper (1) is arranged at the upper end of the opening of the rotating mace device. The bottom of the feeding hopper (1) is provided with a The sealing plate of the embodiment of the present invention is provided in the rotating mace device, wherein a rotatable rotating mace (6) is provided, wherein the rotating mace (6) is vertically arranged, wherein the solid medicine adding mechanism (4) is fixed to the dosing reaction box (8) and is located on both sides above the rotating mace (6), wherein the left and right sides of the dosing reaction box (8) are provided with a medicine liquid adding mechanism (5), wherein the bottom of the dosing reaction box (8) is provided with a movable valve drop opening, and a lower conveying mechanism (7) connected to the dosing reaction box (8), wherein the upper end opening of the dosing reaction box (8) is provided below the vibration rotating seat (2), wherein the vibration rotating seat (2) is provided with a vibration power device corresponding to the dosing reaction box (8), wherein the bottom of the vibration rotating seat (2) is provided with a walking pulley, wherein the vibration rotating seat (2) can drive large-size materials to be transferred to the upper conveying mechanism (3) during the walking process, and small-size materials enter the dosing reaction box (8).

2. The screening and dosing reaction device for chemical oxidation remediation of contaminated soil according to claim 1 is characterized by: When the dosing reaction box (8) adds material to 3 / 4 of its volume, the upper opening of the dosing reaction box (8) is sealed and connected to the drop opening at the lower end of the feeding hopper (1).

3. The screening and dosing reaction device for chemical oxidation remediation of contaminated soil according to claim 1 is characterized by: The drug adding reaction box (8) is movably connected to the rotating mace (6), and the bottom of the rotating mace (6) is connected to a reduction motor.

4. The screening and dosing reaction device for chemical oxidation remediation of contaminated soil according to claim 1 is characterized by: The solid medicine adding mechanism (4) is a dosing nozzle suspended on the top wall of the dosing reaction box (8), and two dosing nozzles are provided, and the two dosing nozzles are arranged at intervals along the length direction of the rotating mace (6).

5. The screening and dosing reaction device for chemical oxidation remediation of contaminated soil according to claim 1 is characterized by: The liquid medicine adding mechanism (5) is a medicine adding nozzle suspended on the left and right sides of the medicine adding reaction box (8). Two medicine adding nozzles are provided, and the lengths of the two medicine adding nozzles are set according to the distance between the rotating mace (6).

6. A screening and dosing reaction device for chemical oxidation remediation of contaminated soil according to any one of claims 1 to 5, characterized in that: The dosing reaction box (8) is enclosed by a top plate, a bottom plate, and a circular baffle to form a cylindrical shape, and reinforcement columns are arranged at the same distance around the dosing reaction box (8).

7. A screening and dosing reaction device for chemical oxidation remediation of contaminated soil according to any one of claims 1 to 5, characterized in that: The length of the rotating shaft of the vibration rotating seat (2) is gradually shortened according to the vibration effect and the climbing height of the material, so that the large-diameter materials are concentrated to the upper conveying mechanism (3).

8. A screening and dosing reaction device for chemical oxidation remediation of contaminated soil according to any one of claims 1 to 5, characterized in that: The rotating mace (6) is provided with a plurality of rows of mace teeth, and the lengths of the plurality of rows of mace teeth are arranged at intervals according to the height of the rotating mace (6).

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