CN110842017A - Modularized mobile soil leaching system - Google Patents
Modularized mobile soil leaching system Download PDFInfo
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- CN110842017A CN110842017A CN201911183601.XA CN201911183601A CN110842017A CN 110842017 A CN110842017 A CN 110842017A CN 201911183601 A CN201911183601 A CN 201911183601A CN 110842017 A CN110842017 A CN 110842017A
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- soil
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- contaminated soil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
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- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
The invention provides a modular mobile soil washing system, which comprises: a soil input device for receiving the contaminated soil and discharging the contaminated soil while vibrating; a vibration feed port for receiving the contaminated soil discharged from the soil input device and quantitatively discharging the contaminated soil by controlling a vibration speed; a conveyor belt receiving and conveying the contaminated soil quantitatively discharged from the vibration feed port; a particle size screening machine provided with a screening net for screening the contaminated soil transferred from the transfer belt into soil having a particle size of a predetermined particle size or less and contaminated soil having a particle size of a predetermined particle size or more; a high-pressure leaching device which leaches the contaminated soil with the granularity below the specified granularity received from the granularity screening machine at high pressure, separates the contaminated soil into the restored soil and the pollutant and discharges the soil and the pollutant; and a screening device which receives the remediated soil and the contaminants discharged from the high pressure leaching device, and discharges the remediated soil with a predetermined particle size or more and the wastewater with a predetermined particle size or less based on the predetermined particle size.
Description
Technical Field
The invention relates to the technical field of polluted soil remediation, in particular to a modular mobile soil leaching system.
Background
In the soil field restoration project, pollutants such as polycyclic aromatic hydrocarbon, dioxin, pesticide, heavy metal and the like cannot be directly leached by clear water, so that a chemical extraction method is used, but equipment is very complex when the chemical extraction method is used.
In the soil site remediation engineering, the soil leaching method is the mainstream technology for treating the heavy metal or the heavy metal and organic pollution composite polluted site.
The soil leaching technique is a technique of separating heavily contaminated soil components or transferring contaminants from a soil phase to a liquid phase by means of physical separation or leaching by adding water or a suitable leaching solution. Compared with other remediation modes, the ectopic soil leaching process has the advantages of good effect, wide application range, relatively low cost, easiness in implementation and the like, and is widely concerned in recent years. And after leaching, carrying out solid-liquid separation on the mixed solution, discharging or recycling the supernatant, and backfilling after sludge dehydration. At present, the commonly used heterotopic soil leaching solid-liquid separation process comprises an in-tank standing method, a filtration type solid-liquid separation method, a centrifugal type solid-liquid separation method and the like.
However, the current general soil leaching remediation scheme has the disadvantages of poor removal effect, long remediation time and the like for heavy metal pollutants with strong adhesive force, the remediation time needs to be prolonged in order to improve the heavy metal pollutants, and for pollutants with strong adhesive force, the removal effect cannot be achieved even if the remediation time is prolonged.
In addition, the general soil washing method is affected by the kind of heavy metals, the concentration of pollution, and the size of soil particles.
Disclosure of Invention
The present invention has been made in view of the above-mentioned disadvantages of the conventional soil washing technology, such as narrow application range, poor removal effect, and long restoration time, and it is an object of the present invention to provide a miniaturized modular mobile soil washing system having a wide application range, a good removal effect, and a high restoration efficiency.
The modular mobile soil washing system of the invention comprises: a soil input device for receiving the contaminated soil and discharging the contaminated soil while vibrating; a vibration feed port for receiving the contaminated soil discharged from the soil input device and quantitatively discharging the contaminated soil by controlling a vibration speed; a conveyor belt receiving and conveying the contaminated soil quantitatively discharged from the vibration feed port; a particle size screening machine provided with a screening net for screening the contaminated soil transferred from the conveyor belt into soil having a particle size of a predetermined particle size or less and contaminated soil having a particle size of a predetermined particle size or more; a high-pressure washing device for washing the contaminated soil with a particle size below a predetermined particle size received from the particle size screening machine at a high pressure, separating the contaminated soil into a remediated soil and a contaminant, and discharging the remediated soil and the contaminant; and a screening device which receives the remediated soil and the contaminants discharged from the high pressure leaching device, and discharges the remediated soil having a predetermined particle size or more and the wastewater having a predetermined particle size or less based on the predetermined particle size.
The modular mobile soil washing system also comprises a rotary drum washing machine, wherein the rotary drum washing machine is arranged between the conveyor belt and the granularity screening machine, receives the polluted soil from the conveyor belt and cleans the polluted soil with clear water.
The high-pressure leaching device comprises: a primary mixing chamber which is provided with a throwing inlet for throwing the polluted soil and water and a high-pressure leaching water inlet for high-pressure leaching water to enter; a high-speed mixing chamber located on a downstream side of the primary mixing chamber and having a reduced diameter relative to the primary mixing chamber; and an expansion collision chamber located on a downstream side of the high-speed mixing chamber and having a diameter that becomes larger with respect to the high-speed mixing chamber.
The soil input device may be a vibrating funnel.
According to the modular mobile soil leaching system, the harmful substances with low solubility can be divided by physical particle size, the initial concentration or the content is not considered, and the harmful substances with high solubility can be extracted and purified from the soil by using high-pressure leaching water, so that the application range is wide.
Further, since the high-pressure leaching method using the high-speed fluid technology separates and removes harmful substances from soil, a high-efficiency remediation effect can be expected.
In addition, because the physical leaching method only uses water without using a chemical solvent, the method does not generate 2 times of pollution due to the chemical solvent, does not need more water to dilute sewage, has low by-products, has small equipment volume, is easy to install, dismantle and carry, and has the minimum influence on the surrounding environment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 shows a schematic of the construction of a modular mobile soil washing system according to an embodiment of the invention.
Fig. 2 shows a schematic view of the high-pressure washing arrangement of the modular mobile soil washing system according to the invention.
Fig. 3 shows a schematic of the construction of a modular mobile soil washing system according to another embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 2, an embodiment of the present invention provides a modular mobile soil washing system, including: a soil input device 10 for receiving contaminated soil and discharging the contaminated soil while vibrating; a vibration inlet 20 for receiving the contaminated soil discharged from the soil input device 10 and quantitatively discharging the contaminated soil by controlling a vibration speed; a conveyor belt 40 receiving and conveying the contaminated soil quantitatively discharged from the vibration feed port; a particle size screening machine 50 provided with a screening net 51 for screening the contaminated soil transferred from the transfer belt 40 into soil having a particle size of a predetermined particle size or less and contaminated soil having a particle size of a predetermined particle size or more; a high-pressure washing device 30 for washing the contaminated soil having a particle size of a predetermined particle size or less received from the particle size sieving machine 50 at a high pressure, separating the contaminated soil into a remediated soil and a contaminant, and discharging the remediated soil and the contaminant; and a screening device 60 that receives the remediated soil and the contaminants discharged from the high pressure leaching device, and discharges the remediated soil having a predetermined particle size or more and the wastewater having a predetermined particle size or less based on the predetermined particle size.
The high pressure leaching apparatus 30 includes: a primary mixing chamber 33 formed with an inlet 31 for feeding contaminated soil and water and a high pressure leaching water inlet 32 for high pressure leaching water to enter; a high-speed mixing chamber 34 located on the downstream side of the primary mixing chamber 33 and having a reduced diameter with respect to the primary mixing chamber 33, and an expansion collision chamber 35 located on the downstream side of the high-speed mixing chamber 34 and having an increased diameter with respect to the high-speed mixing chamber 34.
The soil input device 10 may be a vibrating funnel.
The following describes a process of repairing soil using a modular mobile soil washing system according to an embodiment of the present invention with reference to the accompanying drawings.
First, contaminated soil to be restored is input into the soil input device 10, and the soil input device 10 may be a vibrating hopper, and the contaminated soil is discharged while vibrating, so that a clogging phenomenon of a lower discharge port of the soil input device 10 can be prevented.
The contaminated soil is discharged from the soil loading device 10 to the vibration feeder 20, and the contaminated soil is discharged to the conveyor 40 at a predetermined fixed amount by adjusting the vibration speed of the vibration feeder 20.
Conveyer belt 40 will pollute soil and convey granularity sieve separator 50, is equipped with screening net 51 in the granularity sieve separator 50, and this screening net 51 can sieve required granularity in 2 ~ 40mm as required. The soil having a predetermined particle size or more, which is sieved by the sieving net 51, is discharged to the outside directly, and the soil having a predetermined particle size or less is discharged to the high-pressure washing apparatus 30.
Soil and water with a specified particle size or less are fed from an inlet 31 of the high-pressure leaching device 30, high-speed air flow is generated in the high-pressure leaching device 30, the high-pressure leaching water, the air and the target soil entering the high-pressure leaching device 30 are mixed in a primary mixing chamber 33 of the high-pressure leaching device 30, and then enter a high-speed mixing chamber 34 with a reduced diameter to be instantly mixed to form high-pressure high-speed fluid. The high-pressure high-speed fluid is formed and enters the expansion collision chamber 35 having a larger diameter, and the mixed fluid rapidly expands in the expansion collision chamber 35 and collides with the collision wall 351 at the rear end, thereby breaking the target soil particles. The target soil coarse-grained components and the harmful substances are separated into a large amount of fine-grained components by a strong crushing force by the high-speed high-pressure impact.
The remediated soil after the above-described heavy leaching in the high pressure leaching apparatus 30 is discharged to the screening apparatus 60 through the discharge port 352 of the high pressure leaching apparatus 30, and the screening apparatus 60 receives the remediated soil and the contaminated materials discharged from the high pressure leaching apparatus 30, discharges the remediated soil with a predetermined particle size (for example, 0.1mm) as purified soil, and discharges the remediated soil with a predetermined particle size or smaller as waste water to the waste water tank 80.
The pollutants and fine dust discharged as the waste water can be purified into process water by the steps of precipitation, dehydration, and the like, and the sludge is dehydrated by a filter press to bury the waste or to stabilize the sludge.
According to the modular mobile soil leaching system, the harmful substances with low solubility can be divided by physical particle size, the initial concentration or the content is not considered, and the harmful substances with high solubility can be extracted and purified from the soil by using high-pressure leaching water, so that the application range is wide.
Moreover, since the high-pressure leaching manner is used and the leaching water and the target soil after high-speed mixing collide with the rear end wall as the collision wall 351 in the expansion collision chamber 35, the soil particles are crushed, the soil coarse-grained components and the harmful substances are separated into a large amount of fine-grained components due to strong crushing force, the removal effect and the remediation efficiency of the heavy metal pollutants are improved, and the miniaturization of the clean-water high-pressure leaching soil remediation system can be realized.
In addition, because the physical leaching method only uses water without using a chemical solvent, the method does not generate 2 times of pollution due to the chemical solvent, does not need more water to dilute sewage, has low by-products, has small equipment volume, is easy to install, dismantle and carry, and has the minimum influence on the surrounding environment.
A modular mobile soil washing system according to another embodiment of the present invention is described below with reference to fig. 3.
Compared with the modular mobile soil washing system of the previous embodiment, the modular mobile soil washing system of the present embodiment further includes a drum washer 70, where the drum washer 70 is disposed between the conveyor belt 40 and the grain size screener 50, receives the contaminated soil from the conveyor belt 40, and cleans the contaminated soil with clean water.
As described above, the sieving net 51 provided in the particle size sieving machine 50 can sieve a desired particle size of 2 to 40mm as needed. On the other hand, for soil with a particle size of 2mm or more, the soil can be washed by sprinkling water in a vibrator. Therefore, after the soil cleaned by the drum washer 70 is sieved by the particle size sieving machine 50, the soil having a predetermined particle size or more can be directly discharged as clean soil.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. A modular mobile soil washing system is characterized in that,
the method comprises the following steps:
a soil input device (10) for receiving contaminated soil and discharging the contaminated soil while vibrating;
a vibration inlet (20) for receiving the contaminated soil discharged from the soil input device (10) and quantitatively discharging the contaminated soil by controlling a vibration speed;
a conveyor belt (40) receiving and conveying the contaminated soil quantitatively discharged from the vibratory feed port;
a particle size screening machine (50) provided with a screening net (51) for screening the contaminated soil conveyed from the conveyor belt (40) into soil having a particle size of a predetermined particle size or less and contaminated soil having a particle size of a predetermined particle size or more;
a high-pressure washing device (30) for washing the contaminated soil with a particle size below a predetermined particle size received from the particle size screening machine (50) at a high pressure, separating the contaminated soil into a remediated soil and a contaminated material, and discharging the remediated soil and the contaminated material; and
and a screening device (60) which receives the remediated soil and the contaminants discharged from the high pressure leaching device, discharges purified soil having a predetermined particle size or more and discharges waste water having a predetermined particle size or less, based on the predetermined particle size.
2. The modular mobile soil washing system of claim 1,
also included is a drum washer (70) disposed between the conveyor belt (40) and the size screener (50) for receiving contaminated soil from the conveyor belt (40) and for performing a clean water wash of the contaminated soil.
3. The modular mobile soil washing system of claim 1,
the high-pressure rinsing device (30) comprises:
a primary mixing chamber (33) formed with an inlet (31) for feeding contaminated soil and water and a high-pressure leaching water inlet (32) for high-pressure leaching water;
a high-speed mixing chamber (34) located on the downstream side of the primary mixing chamber (33) and having a reduced diameter relative to the primary mixing chamber (33); and
an expansion collision chamber (35) located on the downstream side of the high-speed mixing chamber (34) and having a larger diameter than the high-speed mixing chamber (34).
4. The modular mobile soil washing system of claim 1,
the soil input device (10) may be a vibrating funnel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911183601.XA CN110842017A (en) | 2019-11-27 | 2019-11-27 | Modularized mobile soil leaching system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911183601.XA CN110842017A (en) | 2019-11-27 | 2019-11-27 | Modularized mobile soil leaching system |
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| CN110842017A true CN110842017A (en) | 2020-02-28 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112775171A (en) * | 2020-11-30 | 2021-05-11 | 苏州市宏宇环境科技股份有限公司 | Method for washing and desorbing heavy metal in viscous soil |
| CN114733893A (en) * | 2021-04-29 | 2022-07-12 | 智优株式会社 | Module type cleaning device for soil purification |
| CN115487698A (en) * | 2022-09-01 | 2022-12-20 | 同济大学 | High-pressure vortex high-efficiency separation method for pollutants in soil |
| CN115487699A (en) * | 2022-09-01 | 2022-12-20 | 同济大学 | High-pressure eddy-current efficient separation device for pollutants in soil |
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| CN115487699B (en) * | 2022-09-01 | 2024-05-03 | 同济大学 | High-pressure vortex high-efficiency separating device for pollutants in soil |
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Application publication date: 20200228 |