Skid-mounted soil in-situ chemical oxidation remediation device

Abstract

The utility model relates to the technical field of soil remediation, in particular to a skid-mounted soil in-situ chemical oxidation remediation device which comprises a conveying device, a polluted soil bin, a medicament bin, a medicament tank, a spraying device and a bottom skid, the polluted soil bin is mounted at a first inlet of the conveying device, and the medicament bin is arranged above a second inlet of the conveying device. A spraying device is installed at a third inlet in the top of the conveying device, and a liquid medicine conveying pipeline is fixedly communicated between a liquid outlet in the lower portion of the agent tank and the spraying device. The chemical dosing device is reasonable and compact in structure and convenient to use, chemical agents of different types or different phase states are accurately and quantitatively added into polluted soil, the chemical agents and the polluted soil are fully contacted and react during chemical agent adding, the soil remediation treatment efficiency is improved, the chemical agents are saved, the input cost is reduced, and the economic benefit is increased. The device has the characteristics of safety, labor saving, simplicity, convenience and high efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of soil remediation, and is a skid-mounted in-situ chemical oxidation soil remediation device. Background Art

[0002] With the development of industry, the expansion of cities and the adjustment of industrial structure, the relocation of the original highly polluting and energy-consuming enterprises has led to a sharp increase in the number of polluted sites left behind. Among them, the proportion of organic polluted sites is relatively large. Organic pollutants have the characteristics of high toxicity, persistence, bioaccumulation and low degradability, and can remain in the soil for a long time, causing great harm to the soil environment and organisms. There is an urgent need to adopt a fast and efficient removal process for the pollutants in such sites.

[0003] At present, the main remediation processes for organic polluted sites include co-processing technology in cement kilns, thermal desorption technology, and chemical oxidation technology, etc. Among them, the co-processing technology in cement kilns has a high input cost, and moreover, the complexity of the geographical location of the area where the polluted site is located restricts the treatment capacity of the cement kiln co-processing enterprises; the equipment transportation, installation and commissioning of the thermal desorption technology, as well as the construction of auxiliary temporary facilities, etc. take a long time, and the energy supply of the equipment is uncontrollable. In addition, the treatment cost of the thermal desorption technology is also relatively high; compared with the previous two soil remediation technologies, the chemical oxidation technology has obvious advantages, including rapid reaction to pollutants, high remediation efficiency, and low cost, etc. Therefore, the chemical oxidation technology that directly decomposes pollutants in the soil through chemical action has received more and more attention.

[0004] The Chinese patent document with the publication number of CN209222876U discloses a chemical oxidation remediation device for organic polluted soil, which includes a soil crusher, a screening machine and a mixer arranged in sequence; the discharge end of the soil crusher is arranged above the screening machine; there is a conveying component for conveying soil between the screening machine and the mixer, and the conveying component includes a first conveyor belt connected to the screening machine, a belt scale connected to the end of the first conveyor belt far from the screening machine, and a second conveyor belt connected to the end of the belt scale far from the first conveyor belt, and the end of the second conveyor belt far from the belt scale is connected to the feed end of the mixer; there is a feeding component on one side of the mixer, and the feeding component includes a first storage tank containing sodium persulfate, a second storage tank containing sodium hydroxide, a water tank, a batching tank and a storage tank; the discharge port of the first storage tank is connected to the feed port of the batching tank through a pipeline; the discharge port of the second storage tank is connected to the feed port of the batching tank through a pipeline; the discharge port of the water tank is connected to the feed port of the batching tank through a pipeline; the discharge port of the batching tank is connected to the feed port of the storage tank through a pipeline; a delivery pipe is provided at the discharge port of the storage tank, and the delivery pipe is connected to the feed end of the mixer. This patent has the risk of nozzle blockage, and there are also great application limitations for drugs with low solubility and adverse environments such as low temperature, drought and water shortage.

[0005] The Chinese patent document with the publication number CN219004092U discloses an automatic dosing device for off-site chemical oxidation soil remediation, including a base. It is characterized in that: a remediation box is fixedly arranged on the top of the base, a medicine box is fixedly arranged on the top of the remediation box, the opening at the bottom of the medicine box is communicated with the top of the remediation box, a conveying gear is movably arranged inside the opening of the medicine box, a servo motor is installed on the front of the medicine box, and the output end of the servo motor is fixed to the axis of the conveying gear. For this patent, the soil needs to be subjected to strict crushing treatment first, and there are high requirements for the crushing particle size. Otherwise, it will seriously affect the full contact and reaction between the medicine and the soil. In addition, there is also the problem that liquid soil remediation agents (such as hydrogen peroxide in Fenton's reagent) cannot be added.

[0006] The above off-site chemical oxidation technology involves adding oxidants to contaminated soil. Through oxidation, the pollutants in the soil are converted into non-toxic or relatively less toxic substances, and most organic matter pollutions such as petroleum hydrocarbons, benzene series, phenols, chlorinated organic solvents, polycyclic aromatic hydrocarbons, and pesticides can be treated. In engineering applications, the most direct method is to add relevant agents to the contaminated soil to react with the organic matter pollutants in the soil. When using the off-site chemical oxidation process to treat contaminated soil, how to effectively achieve the ideal treatment effect is the biggest technical bottleneck at present. From the application situation of the off-site chemical oxidation technology in China, the current soil remediation effects are uneven, mainly due to unreasonable treatment methods. Among them, the important reasons for the uneven remediation effects are that the medicine and the pollutants do not come into contact in time, the medicine and the pollutants do not come into full contact, and when multiple medicines are added in a mixture, the medicines react with each other before contacting the pollutants in the soil.

[0007] Specifically, in the process of off-site chemical oxidation soil remediation, for the contaminated soil, solid powder agents or prepared liquid agents need to be used for remediation, and the agents also need to be added to the soil for chemical oxidation remediation. The existing off-site chemical oxidation remediation devices generally have problems such as a large system, high operation intensity, and often incomplete remediation. Or, due to the small production capacity or fine equipment of the existing off-site chemical oxidation remediation devices, they cannot be widely used in actual production. Or, in the existing off-site chemical oxidation remediation system, during the dosing process of the medicine, it is impossible to achieve immediate stirring and mixing treatment and the simultaneous addition of two kinds of medicines. For example, when using Fenton's reagent to oxidize organic contaminated soil, hydrogen peroxide has partially decomposed before contacting the pollutant due to premature contact with ferrous sulfate, resulting in a significant reduction in the drug effect.

[0008] To sum up, the problems existing in the existing chemical oxidation soil remediation technology, such as easy blockage of the medicine outlet, poor soil remediation effect, high input cost, large remediation treatment intensity, and application limitations, have become difficult technical problems in the soil remediation industry. Summary of the Invention

[0009] The utility model provides a skid-mounted in-situ chemical oxidation soil remediation device, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problems of easy blockage of the chemical agent outlet, poor soil remediation effect, high input cost, large remediation treatment intensity and application limitations existing in the existing chemical oxidation soil remediation device.

[0010] The technical solution of the utility model is realized by the following measures: a skid-mounted in-situ chemical oxidation soil remediation device, including a conveying device, a contaminated soil silo, a chemical agent silo, a chemical agent tank, a spraying device and a skid. The contaminated soil silo, the conveying device, the chemical agent silo and the chemical agent tank are fixedly installed on the skid. The first inlet at the top of the left end of the conveying device is fixedly installed with a contaminated soil silo. The chemical agent silo is arranged above the second inlet at the top of the conveying device. The third inlet at the top of the conveying device is fixedly installed with a spraying device. A liquid medicine conveying pipeline is fixedly connected between the liquid outlet at the lower part of the chemical agent tank and the spraying device.

[0011] The following is a further optimization and / or improvement of the above technical solution of the utility model:

[0012] The above-mentioned conveying device includes a casing and a double-shaft screw conveyor. The double-shaft screw conveyor is driven in a spiral manner from left to right. Spraying devices are arranged at intervals before and after above the double-shaft screw conveyor. Chemical agent tanks are arranged at intervals before and after on the casing.

[0013] The first inlet at the top of the left end of the above-mentioned casing is fixedly installed with a contaminated soil silo. The contaminated soil silo is in the shape of a frustum with a large top and a small bottom. A crusher is fixedly arranged in the contaminated soil silo.

[0014] The chemical agent silo is arranged on the right side of the above-mentioned contaminated soil silo. The chemical agent silo is in the shape of a frustum with a large top and a small bottom. A belt conveyor is arranged between the upper part of the second inlet at the top of the casing and the discharge port at the bottom of the chemical agent silo. The belt conveyor is driven from right to left. The discharge port at the bottom of the chemical agent silo is fixedly connected to the inlet at the top of the right end of the belt conveyor. The discharge port at the left end of the belt conveyor is vertically corresponding to the second inlet at the top of the casing.

[0015] A belt scale is fixedly installed on the above-mentioned belt conveyor.

[0016] The above-mentioned spraying device includes a first liquid distribution pipeline, a second liquid distribution pipeline, a three-way pipe fitting and a sprayer. A liquid medicine conveying pipeline is fixedly connected between the liquid outlet at the lower part of the chemical agent tank and the inlet at the top of the three-way pipe fitting. The left outlet of the three-way pipe fitting is fixedly connected to the first liquid distribution pipeline. The right outlet of the three-way pipe fitting is fixedly connected to the second liquid distribution pipeline. One or more second liquid distribution pipelines are fixedly connected to both the first liquid distribution pipeline and the second liquid distribution pipeline. Sprayers are fixedly installed at the outlets of the shunt pipes. The spray nozzles of the sprayers are all arranged between the top of the casing and the top of the double-shaft screw conveyor.

[0017] A stirrer is fixedly installed inside the above-mentioned reagent tank.

[0018] A metering pump is fixedly installed on the above-mentioned liquid medicine pipeline.

[0019] The above-mentioned device further includes a controller, and the crusher, belt conveyor, belt weigher, stirrer, metering pump, and double-shaft screw conveyor are all electrically connected to the controller.

[0020] The above-mentioned skid includes a chassis and a support frame. A controller is fixedly installed on the chassis, and a contaminated soil bin, a crusher, a reagent bin, a reagent tank, a stirrer, a metering pump, a belt conveyor, and a double-shaft screw conveyor are fixedly installed on the support frame. One or more lifting holes are provided on the chassis.

[0021] The structure of the present utility model is reasonable and compact, and it is convenient to use. It reduces the risk of blockage at the reagent outlet. The screw conveyor plays a certain role in extrusion and crushing, reducing the crushing requirement for the pretreatment of contaminated soil, fully and evenly mixing the contaminated soil and the reagent, and fully reacting, improving the repair and treatment efficiency, thereby saving reagents and reducing costs, and having the characteristics of safety, labor saving, simplicity, and high efficiency. Description of the Drawings

[0022] Attached Figure 1 is a schematic process flow diagram of the present utility model.

[0023] Attached Figure 1 The codes in are respectively: 1 is the contaminated soil bin, 2 is the reagent bin, 3 is the reagent tank, 4 is the chassis, 5 is the liquid medicine pipeline, 6 is the casing, 7 is the double-shaft screw conveyor, 8 is the crusher, 9 is the belt conveyor, 10 is the belt weigher, 11 is the first liquid separation pipeline, 12 is the second liquid separation pipeline, 13 is the three-way pipe fitting, 14 is the shunt pipe, 15 is the sprayer, 16 is the stirrer, 17 is the metering pump, 18 is the controller, 19 is the support frame, and 20 is the lifting hole. Detailed Embodiments

[0024] The present utility model is not limited by the following embodiments, and the specific implementation manner can be determined according to the technical solution of the present utility model and the actual situation.

[0025] In the present utility model, unless otherwise specified, the equipment and devices used are all publicly known and commonly used equipment and devices in the art.

[0026] In the present utility model, for the convenience of description, the description of the relative position relationship of each component is all carried out according to the layout mode of the attached drawings of the specification. For example, the position relationships such as front, rear, up, down, left, and right are determined according to the layout direction of the attached drawings of the specification. Figure 1 of the drawings. Figure 1 is determined.

[0027] The present utility model will be further described below in conjunction with embodiments and the accompanying drawings:

[0028] Embodiment 1: As shown in the attached Figure 1 figure, the skid-mounted in-situ chemical oxidation soil remediation device includes a conveying device, a contaminated soil silo 1, a chemical agent silo 2, a chemical agent tank 3, a spraying device, and a bottom skid. The contaminated soil silo 1, the conveying device, the chemical agent silo 2, and the chemical agent tank 3 are fixedly installed on the bottom skid. The first inlet at the top of the left end of the conveying device is fixedly installed with the contaminated soil silo 1. The chemical agent silo 2 is arranged above the second inlet at the top of the conveying device. The spraying device is fixedly installed at the third inlet at the top of the conveying device. A liquid medicine conveying pipeline 5 is fixedly connected between the liquid outlet at the lower part of the chemical agent tank 3 and the spraying device.

[0029] According to actual needs, the above skid-mounted in-situ chemical oxidation soil remediation device can be further optimized or / and improved:

[0030] Embodiment 2: The difference from Embodiment 1 is that: as shown in the attached Figure 1 figure, the conveying device includes a housing 6 and a double-shaft screw conveyor 7. The double-shaft screw conveyor 7 is driven by a screw from left to right. Spraying devices are arranged at intervals before and after above the double-shaft screw conveyor 7. Chemical agent tanks 3 are arranged at intervals before and after the housing 6.

[0031] According to needs, the double-shaft screw conveyor 7 can tumble and shred the contaminated soil through the double-shaft screw blades, and at the same time squeeze and push the contaminated soil from left to right. It can also achieve full mixing of the contaminated soil with two-phase chemical agents, and convey the fully mixed soil to the right.

[0032] Embodiment 3: The difference from Embodiments 1 to 2 is that: as shown in the attached Figure 1 figure, the first inlet at the top of the left end of the housing 6 is fixedly installed with the contaminated soil silo 1. The contaminated soil silo 1 is in the shape of a frustum with a large top and a small bottom. A crusher 8 is fixedly arranged in the contaminated soil silo 1.

[0033] According to needs, the excavator transfers the contaminated soil with a particle size < 20 mm after crushing pretreatment into the contaminated soil silo 1, and it is secondarily crushed by the crusher 8, which can prevent the contaminated soil from bridging and sticking. The contaminated soil crushed by the crusher 8 directly falls into the double-shaft screw conveyor 7 at the bottom of the contaminated soil silo 1 and is conveyed to the right.

[0034] Embodiment 4: The difference from Embodiments 1 to 3 is that: as shown in the attached Figure 1As shown in the figure, a chemical agent bin 2 is arranged on the right side of the contaminated soil bin 1. The chemical agent bin 2 is in the shape of a frustum of a pyramid with a larger top and a smaller bottom. A belt conveyor 9 is arranged between the upper second inlet of the top of the casing 6 and the discharge port at the bottom of the chemical agent bin 2. The belt conveyor 9 is driven from right to left. The discharge port at the bottom of the chemical agent bin 2 is fixedly communicated with the top inlet at the right end of the belt conveyor 9. The discharge port at the left end of the belt conveyor 9 is vertically corresponding to the second inlet at the top of the casing 6.

[0035] As required, the outlet at the left end of the belt conveyor 9 is vertically corresponding to the second inlet at the top of the casing 6, and the height between the outlet at the left end of the belt conveyor 9 and the second inlet at the top of the casing 6 is adjusted as required to ensure that the solid chemical agent in the chemical agent bin 2 falls onto the double-shaft screw conveyor 7 in the casing 6 quantitatively.

[0036] Example 5: The difference from Examples 1 to 4 is that as shown in the appendix Figure 1 As shown in the figure, a belt scale 10 is fixedly installed on the belt conveyor 9.

[0037] As required, the length and width of the belt of the belt conveyor 9 are 4500mm×650mm, and the center distance is 2000mm. The model of the belt scale 10 is TDG65, and the motor power is 1.5KW. The belt scale 10 weighs the solid chemical agent falling onto the belt conveyor 9. According to the designed demand of the solid chemical agent, the amount of the solid chemical agent falling onto the double-shaft screw conveyor 7 is controlled by adjusting the driving speed of the belt conveyor 9.

[0038] Example 6: The difference from Examples 1 to 5 is that as shown in the appendix Figure 1 As shown in the figure, the spraying device includes a first liquid distribution pipeline 11, a second liquid distribution pipeline 12, a three-way pipe fitting 13, a shunt pipe 14, and a sprayer 15. A liquid medicine conveying pipeline 5 is fixedly communicated between the lower liquid outlet of the chemical agent tank 3 and the top liquid inlet of the three-way pipe fitting 13. The left end outlet of the three-way pipe fitting 13 is fixedly communicated with the first liquid distribution pipeline 11, and the right end outlet of the three-way pipe fitting 13 is fixedly communicated with the second liquid distribution pipeline 12. One or more shunt pipes 14 are fixedly communicated with both the first liquid distribution pipeline 11 and the second liquid distribution pipeline 12. The outlets of the shunt pipes 14 are all fixedly installed with sprayers 15, and the spray nozzles of the sprayers 15 are all arranged between the top of the casing 6 and the top of the double-shaft screw conveyor 7.

[0039] As required, the distance between the spray nozzle of the sprayer 15 and the top of the double-shaft screw conveyor 7 can be reasonably adjusted, so that all the liquid chemical agent can be sprayed on the soil on the double-shaft screw conveyor 7, and the spray nozzles of the sprayers 15 can be prevented from being blocked by the tumbling soil on the double-shaft screw conveyor 7.

[0040] Example 7: The difference from Examples 1 to 6 is that as shown in the appendix Figure 1 As shown in the figure, a mixer 16 is fixedly installed in the chemical agent tank 3.

[0041] Example 8: The difference from Examples 1 to 7 is that, as shown in the appendix Figure 1 , a metering pump 17 is fixedly installed on the liquid medicine delivery pipeline 5.

[0042] As needed, the model of the metering pump 17 is JMD-S1200 / 0.7, with a maximum flow rate of 1200 L / h, a maximum working pressure of 0.7 MPa, a motor power of 1.5 KW, and an inlet and outlet pipe diameter of DN25. According to the designed demand of the liquid medicine, the flow rate of the liquid medicine at the outlet of the metering pump 17 is controlled by frequency conversion to control the amount of liquid medicine entering the double-shaft screw conveyor 7.

[0043] Example 9: The difference from Examples 1 to 8 is that, as shown in the appendix Figure 1 , the device further includes a controller 18, and the crusher 8, belt conveyor 9, belt scale 10, mixer 16, metering pump 17, and double-shaft screw conveyor 7 are all electrically connected to the controller 18.

[0044] Example 10: The difference from Examples 1 to 9 is that, as shown in the appendix Figure 1 , the skid includes a chassis 4 and a support frame 19. The controller 18 is fixedly installed on the chassis 4, and the contaminated soil silo 1, crusher 8, medicine silo 2, medicine tank 3, mixer 16, metering pump 17, belt conveyor 9, and double-shaft screw conveyor 7 are fixedly installed on the support frame 19. One or more lifting holes 20 are provided on the chassis 4.

[0045] As needed, on each pipeline and equipment of the skid-mounted in-situ chemical oxidation remediation device for soil, conventional valves, thermometers, pressure gauges, etc. well-known and commonly used in the art can also be provided according to production needs.

[0046] This utility model fully mixes the contaminated soil, solid medicine, and liquid medicine and then conveys and discharges them to the pit. The loader is used to regularly transfer the stacked repaired soil to the soil temporary storage yard and perform sprinkler maintenance. After the pollutant concentration in the soil is detected to meet the standards, it is then transported or backfilled.

[0047] The above technical features constitute the embodiments of this utility model, which have strong adaptability and implementation effects. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

[0048] The use process of the embodiment of the utility model is as follows: first, after the crusher 8 crushes the contaminated soil in the contaminated soil bin 1, the contaminated soil directly falls into the double-axis screw conveyor 7, and the double-axis screw conveyor 7 squeezes, crushes and conveys the contaminated soil to the right; then, the solid medicine in the medicine bin 2 falls into the belt conveyor 9, and the belt conveyor 9 puts the required amount of solid medicine into the double-axis screw conveyor 7; at the same time, the liquid medicine in the medicine tank 9 passes through the liquid medicine delivery pipeline 5, the first liquid separation pipeline 11, the second liquid separation pipeline 12, and the diversion pipe 14 in sequence, and the liquid medicine is sprayed on the double-axis screw conveyor 7 through the sprayer 15; finally, the double-axis screw conveyor 7 evenly mixes the contaminated soil, solid medicine and liquid medicine and outputs them to the temporary storage area.

Claims

1. A skid-mounted in-situ chemical oxidation soil remediation device, characterized in that It includes a conveying device, a contaminated soil silo, a chemical agent silo, a chemical agent tank, a spraying device, and a skid. On the skid, the contaminated soil silo, the conveying device, the chemical agent silo, and the chemical agent tank are fixedly installed. At the top of the left end of the conveying device, a contaminated soil silo is fixedly installed at the first inlet. Above the second inlet at the top of the conveying device, there is a chemical agent silo. At the top of the third inlet of the conveying device, a spraying device is fixedly installed. There is a liquid medicine conveying pipeline fixedly connected between the liquid outlet at the lower part of the chemical agent tank and the spraying device.

2. The skid-mounted in-situ chemical oxidation soil remediation device according to claim 1, wherein The conveying device includes a casing and a double-shaft screw conveyor. The double-shaft screw conveyor is driven by screws from left to right. Spraying devices are arranged at intervals in front and behind above the double-shaft screw conveyor. Chemical agent tanks are arranged at intervals in front and behind on the casing.

3. The skid-mounted in-situ chemical oxidation soil remediation device according to claim 1 or 2, characterized in that At the top of the left end of the casing, a contaminated soil silo is fixedly installed. The contaminated soil silo is in the shape of a frustum with a larger top and a smaller bottom. A crusher is fixedly arranged inside the contaminated soil silo.

4. The skid-mounted in-situ chemical oxidation soil remediation device according to claim 3 or as described above, characterized in that A chemical agent silo is arranged on the right side of the contaminated soil silo. The chemical agent silo is in the shape of a frustum with a larger top and a smaller bottom. A belt conveyor is arranged between the upper part of the second inlet at the top of the casing and the discharge outlet at the bottom of the chemical agent silo. The belt conveyor is driven from right to left. The discharge outlet at the bottom of the chemical agent silo is fixedly connected to the inlet at the top of the right end of the belt conveyor. The discharge outlet at the left end of the belt conveyor is vertically corresponding to the second inlet at the top of the casing.

5. The skid-mounted in-situ chemical oxidation soil remediation device according to claim 4, wherein A belt scale is fixedly installed on the belt conveyor.

6. The skid-mounted in-situ chemical oxidation soil remediation device according to claim 2 or 4 or 5, characterized in that The spraying device includes a first liquid distribution pipeline, a second liquid distribution pipeline, a three-way pipe fitting, and a sprayer. There is a liquid medicine conveying pipeline fixedly connected between the liquid outlet at the lower part of the chemical agent tank and the inlet at the top of the three-way pipe fitting. The left outlet of the three-way pipe fitting is fixedly connected to the first liquid distribution pipeline. The right outlet of the three-way pipe fitting is fixedly connected to the second liquid distribution pipeline. One or more second liquid distribution pipelines are fixedly connected to both the first liquid distribution pipeline and the second liquid distribution pipeline. Sprayers are fixedly installed at the outlets of the shunt pipes. The spray ports of the sprayers are all arranged between the top of the casing and the top of the double-shaft screw conveyor.

7. The skid-mounted in-situ chemical oxidation soil remediation device according to claim 6, characterized in that A mixer is fixedly installed inside the chemical agent tank.

8. The skid-mounted in-situ chemical oxidation soil remediation device according to claim 7, wherein A metering pump is fixedly installed on the liquid medicine conveying pipeline.

9. The skid-mounted in-situ chemical oxidation soil remediation device according to claim 8, wherein It also includes a controller. The crusher, the belt conveyor, the belt scale, the mixer, the metering pump, and the double-shaft screw conveyor are all electrically connected to the controller.

10. The skid-mounted in-situ chemical oxidation soil remediation device according to claim 9, wherein The skid includes a chassis and a support frame. The controller is fixedly installed on the chassis. The contaminated soil silo, the crusher, the chemical agent silo, the chemical agent tank, the mixer, the metering pump, the belt conveyor, and the double-shaft screw conveyor are fixedly installed on the support frame. One or more lifting holes are arranged on the chassis.

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