CN211464271U - Leaching system suitable for high moisture content heavy metal pollution clay - Google Patents
Leaching system suitable for high moisture content heavy metal pollution clay Download PDFInfo
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- CN211464271U CN211464271U CN201922191410.XU CN201922191410U CN211464271U CN 211464271 U CN211464271 U CN 211464271U CN 201922191410 U CN201922191410 U CN 201922191410U CN 211464271 U CN211464271 U CN 211464271U
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Abstract
The utility model relates to an elution system suitable for high moisture content heavy metal pollution clay, which comprises a first-level elution grading system (1), a second-level elution grading system (2), a third-level elution grading system (3), a wastewater treatment system (4) and a medicament preparation system (5) in sequence; after being screened by a screening machine, the polluted soil with the particle size not larger than 5cm is directly fed into a first-stage elution grading system, then is sequentially pumped into a second-stage elution grading system and a third-stage elution grading system by a self-priming pump, finally, the upper-layer effluent enters wastewater treatment equipment and is recycled, and the polluted soil is divided into coarse sand, medium sand and fine sand by the third-stage elution grading system.
Description
Technical Field
The utility model belongs to ecological environment restores the field, concretely relates to drip washing system suitable for high moisture content heavy metal pollution clay.
Background
Because heavy metals have concealment and biological degradability, once the heavy metals enter the soil, the heavy metal contaminated soil is difficult to remove, and the current heavy metal contaminated soil remediation ideas commonly used in the field of ecological remediation are mainly divided into two categories, namely, the heavy metals in the soil are converted into a more stable state, and the migration is reduced; the other is to extract heavy metals from the soil. The currently common ecological restoration engineering application technologies include a solidification/stabilization technology, a passivation technology, a plant enrichment and extraction technology, a soil leaching technology and the like. With the discovery of engineering application practices, the first idea of converting heavy metals in soil into a more stable state has great uncertainty in the actual application process, and the main reason is that the heavy metals are not removed from the soil, and the change of the surrounding environment can be converted back to an unstable state again along with the lapse of time when the heavy metals converted into the stable state are converted into the stable state; the second concept of removing heavy metals from soil is gradually receiving attention from people. The technology for removing heavy metals from soil mainly comprises a plant extraction technology and a soil leaching technology, and the former technology depends on plant growth and has the disadvantages of slow effect, large climate influence and the like, so the soil leaching technology is considered to be a quick and effective method for removing the heavy metals from the soil.
The utility model of the patent publication No. CN 104610973B proposes an eluting agent and a method for restoring chromium-contaminated soil, and the patent provides an eluting agent with better restoring effect on total chromium in clay under the condition of ultrasonic enhanced eluting, but does not provide a whole set of applicable eluting system. The utility model discloses an authorization notice number CN 104889150B's utility model provides a chemical drip washing technology of heavy metal contaminated soil, and this technology is realized through steps such as crushing, stirring, screening, drip washing, cyclone separation, chemical precipitation, and this technology has better drip washing effect to the sand that the moisture content is lower, but to the moisture content higher, the contaminated soil that the soil property viscosity is great, the crushing of technology front end, stirring are difficult to reach predetermined effect. The utility model discloses a not enough on small particle size level soil pollution remediation is leached to soil dystopy, has provided one kind and can be applicable to different pollutant types, the prosthetic dystopy leaching complete sets of different particle size level soil to the utility model patent of grant publication number CN 105772497B, and this equipment mainly contains wet-type screening mechanism, spiral grading mechanism, leaching repair body, waste water treatment mechanism and waste water recycle mechanism. Application publication No. CN 109794500A's utility model patent discloses a heavy metal contaminated soil batch formula drip washing processing apparatus. Above-mentioned two utility model patents have all reformed transform in some aspects and have upgraded, have solved some actual problems that the scene met, but still are difficult to exert better drip washing effect to the higher clay of moisture content.
China has broad breadth, the difference of soil in south and north is very large, the north is mainly sandy soil, the south is mainly clay, and the climate difference in south and north causes that underground water in south is much richer than that in north. Based on the reasons, the same technology in actual repair engineering has different requirements on repair equipment for different types of soil, for example, in a polluted site in south China, the common water level of underground water is about 0.5-1.5m, and when the remote leaching repair technology is adopted, the excavated polluted soil is often found to have high water content and high viscosity, and the common soil leaching equipment is difficult to effectively play a role. Therefore, the utility model discloses a drip washing system and method that can be applicable to high moisture content pollutes clay seems very necessary.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solves the contaminated site restoration in-process, provides a high-efficient feasible drip washing system and method to the contaminated soil that moisture content is high and the stickness is big. The utility model discloses the content receives the grit chamber technology inspiration in the city domestic sewage treatment plant: pollutants in the high-water-content polluted clay are difficult to remove in conventional leaching equipment, and if a secondary sedimentation tank process is adopted, the high-water-content clay is directly placed in a water tank filled with a leaching agent, and the pollutants in the soil are removed in a manner of graded leaching and mud-water separation of the soil through external power.
The utility model aims at realizing through the following technical scheme:
the leaching system suitable for the high-water-content heavy metal polluted clay sequentially comprises a first-stage leaching grading system 1, a second-stage leaching grading system 2, a third-stage leaching grading system 3, a wastewater treatment system 4 and a medicament preparation system 5; after being screened by a screening machine, the polluted soil with the particle size not larger than 5cm is directly fed into a first-stage elution grading system, then is sequentially pumped into a second-stage elution grading system and a third-stage elution grading system by a self-priming pump, finally, the upper-layer effluent enters wastewater treatment equipment and is recycled, and the polluted soil 9 is separated into coarse sand 16, medium sand 17 and fine sand 18 through the third-stage elution grading system.
The primary leaching grading system 1 sequentially comprises a primary leaching tank using a first leaching agent 10, primary feeding equipment, a primary stirring motor and a primary sludge discharge equipment dewatering screen;
the secondary leaching grading system 2 sequentially comprises a secondary leaching tank using a second leaching agent 11, secondary feeding equipment, a secondary stirring motor and a secondary sludge discharge equipment plate-and-frame filter press;
the three-stage leaching grading system 3 sequentially comprises a three-stage leaching tank using a third leaching agent 12, three-stage feeding equipment, a three-stage stirring motor and a three-stage sludge discharge equipment plate-and-frame filter press;
the wastewater treatment system 4 is a typical heavy metal wastewater treatment system;
the agent preparation system 5 comprises rinsing agent preparation and water treatment agent preparation.
The utility model discloses a drip washing method suitable for high moisture content heavy metal pollution clay, including following step: (1) pretreatment of contaminated soil: after the polluted soil is excavated, large-size building rubbish is screened out. (2) Primary leaching: the polluted soil is fed by the excavator, enters a first-stage leaching system, is precipitated under the action of gravity and centrifugal force, coarse sand with the water content of less than 25% is discharged through a sludge discharge system, and the rest components enter a second-stage leaching system. (3) Secondary leaching: after the first-stage leaching of the polluted soil, the polluted soil enters a second-stage leaching system, the polluted soil is precipitated under the action of gravity and centrifugal force, the middlings with the water content not higher than 65% are discharged through a sludge discharge system, and the rest components enter a third-stage leaching system. (3) three-stage leaching: after the first-stage leaching and the second-stage leaching of the polluted soil, the polluted soil enters a third-stage leaching system, is precipitated under the action of gravity and centrifugal force, fine sand with the water content not higher than 65% is discharged through a sludge discharge system, and the rest components enter a wastewater treatment system. (4) And (3) terminal processing: and after the polluted soil passes through the three-stage leaching system, the residual wastewater enters the wastewater treatment system to be treated and recycled after reaching the standard, and the sludge discharged by the wastewater treatment system is treated by a unit with hazardous waste treatment qualification according to the hazardous waste commission.
The utility model provides an elution system and method suitable for high moisture content pollutes clay has simple process, and the elution is abundant, and obvious advantages such as hierarchical decrement and energy saving and emission reduction lie in with the biggest difference of present existing elution device, and this elution system and method can fill up the existing short slab that elution equipment is difficult to handle high moisture content clay in the industry of present advancing, has very strong suitability to the clay of china's south area moisture content more than 30%.
Drawings
Fig. 1 is the utility model provides a leaching system suitable for high moisture content pollutes clay.
Numbering system equipment: 1, first-level leaching equipment; 2, secondary leaching equipment; 3, three-stage leaching equipment; 4, adjusting the reaction zone; 5 a coagulating sedimentation area; 6, a sand filtering area; 7, a clean water tank; 8 sludge dewatering equipment.
Material numbering: 9, polluted soil; 10 a first elution reagent; 11 a second elution reagent; 12 a third elution reagent; 13 a first water treatment agent; 14 a second water treatment agent; 15 a third water treatment agent; 16 coarse sand; 17, medium sand; 18 fine sand.
Fig. 2 shows the utility model provides a be applicable to the drip washing method of high moisture content polluted clay.
Detailed Description
In order to make the objects of the present invention, the contents and advantages of the present invention will be more clearly understood, and the present invention will be further described in detail with reference to the field embodiments.
Fig. 1 is the utility model provides a leaching system suitable for high moisture content pollutes clay.
The leaching system suitable for the high-water-content polluted clay sequentially comprises a first-stage leaching grading system 1, a second-stage leaching grading system 2, a third-stage leaching grading system 3, a wastewater treatment system 4 and a medicament preparation system 5; after being screened by a screening machine, the polluted soil with the particle size not larger than 5cm is directly fed into a first-stage elution grading system, then is sequentially pumped into a second-stage elution grading system and a third-stage elution grading system by a self-priming pump, finally, the upper-layer effluent enters wastewater treatment equipment and is recycled, and the polluted soil 9 is separated into coarse sand 16, medium sand 17 and fine sand 18 through the third-stage elution grading system.
The primary leaching grading system 1 sequentially comprises a primary leaching tank using a first leaching agent 10, primary feeding equipment, a primary stirring motor and a primary sludge discharge equipment dewatering screen;
the secondary leaching grading system 2 sequentially comprises a secondary leaching tank using a second leaching agent 11, secondary feeding equipment, a secondary stirring motor and a secondary sludge discharge equipment plate-and-frame filter press;
the three-stage leaching grading system 3 sequentially comprises a three-stage leaching tank using a third leaching agent 12, three-stage feeding equipment, a three-stage stirring motor and a three-stage sludge discharge equipment plate-and-frame filter press;
the wastewater treatment system 4 is a typical heavy metal wastewater treatment system;
the agent preparation system 5 comprises a leaching agent preparation pool and a water treatment agent preparation pool.
Further, the air conditioner is provided with a fan,
(1) the first-stage leaching pond in the first-stage leaching grading system is made of Fiber Reinforced Plastic (FRP), is cylindrical, and is conical at the bottom, and the specific size is determined according to the processing capacity of the whole system. Preferably, the whole set of the leaching equipment has the treatment capacity Q of 5-20m3The range of the first-level leaching pool is 2.3-3 times of the diameter of the cylinder, and the size of the first-level leaching pool is determined according to the following formula:
wherein:
a: total area of the first-stage shower bath, m2；
Q: the entire leaching system is designed with processing capacity, m3/d；
C: designing a solid-liquid ratio of the slurry, g/L;
m: the mud output of the first-stage leaching tank is kg/(m)2/d)；
D: diameter of the first-stage leaching tank, m.
(2) The power of a first-stage stirring motor in the first-stage leaching grading system is within the range of 2.2-5.5 kw, and a stirring rotor is made of 304 stainless steel.
(3) The first-stage sludge discharge equipment in the first-stage leaching and grading system requires the discharged sludge to have the water content lower than 25%.
Further, the air conditioner is provided with a fan,
and (3) determining the material and the size of a second-stage leaching pool and a second stirring motor in the second-stage leaching grading system by referring to the step (1) and the step (2).
The secondary feeding equipment in the secondary leaching grading system comprises a feeding pump and a feeding pipeline, wherein the feeding pump is a self-suction type vortex non-blocking slurry pump, and the flow rate is 5-20m3The speed is 2900r/min, the power of the motor is 1.5-2.2kW, and the pressure control range is 0.1-0.5 Mpa. The material of the feeding pipeline is 304 stainless steel, and the flow rate is 5-20m3/h。
And the secondary sludge discharge equipment in the secondary leaching and grading system requires that the water content of the discharged sludge is not higher than 65%.
Further, the air conditioner is provided with a fan,
and the specification and model of a three-level leaching tower, a three-level feeding device, a three-level stirring motor and a three-level sludge discharging device in the three-level leaching and grading system are determined by referring to the two-level leaching and grading system.
Further, the air conditioner is provided with a fan,
the wastewater treatment system comprises functional modules, wherein the functional modules comprise an adjusting reaction area 4 for introducing a first water treatment medicament 13, a coagulating sedimentation area 5 for introducing a second water treatment medicament 14, a sand filtration area 6 for introducing a third water treatment medicament 15 and a clean water tank 7; and a sludge dewatering device 8.
Further, the air conditioner is provided with a fan,
the leaching agent preparation in the agent preparation system comprises two cylindrical barrels with the volume of 5 cubic meters and made of polyvinyl chloride (PVC), the concentration range of the leaching agent preparation in the system is 1% -50%, and the adding capacity of the leaching agent is 1-2000 kg/h.
The medicament preparation system is used for preparing water treatment medicaments. The system comprises three cylindrical cylinders with the volume of 5 cubic meters and made of polyvinyl chloride (PVC), the water treatment agent of the system has the preparation concentration range of 0.1-30%, and the adding capacity of the leaching agent is 1-1000 kg/h.
The utility model also provides a drip washing method suitable for high moisture content heavy metal pollution clay, including following step: (1) pretreatment of contaminated soil: after the polluted soil is excavated, large-size building rubbish is screened out. (2) Primary leaching: the polluted soil is fed by the excavator, enters a first-stage leaching system, is precipitated under the action of gravity and centrifugal force, coarse sand with the water content of less than 25% is discharged through a sludge discharge system, and the rest components enter a second-stage leaching system. (3) Secondary leaching: after the first-stage leaching of the polluted soil, the polluted soil enters a second-stage leaching system, the polluted soil is precipitated under the action of gravity and centrifugal force, the middlings with the water content not higher than 65% are discharged through a sludge discharge system, and the rest components enter a third-stage leaching system. (3) Third-stage leaching: after the first-stage leaching and the second-stage leaching of the polluted soil, the polluted soil enters a third-stage leaching system, is precipitated under the action of gravity and centrifugal force, fine sand with the water content not higher than 65% is discharged through a sludge discharge system, and the rest components enter a wastewater treatment system. (4) And (3) terminal processing: and after the polluted soil passes through the three-stage leaching system, the residual wastewater enters the wastewater treatment system to be treated and recycled after reaching the standard, and the sludge discharged by the wastewater treatment system is treated by a unit with hazardous waste treatment qualification according to the hazardous waste commission.
Fig. 2 shows the utility model provides a be applicable to the drip washing method of high moisture content polluted clay.
The method comprises the following steps: (1) pretreatment of contaminated soil: after the polluted soil is excavated, large-size building rubbish is screened out. (2) Primary leaching: the polluted soil is fed by the excavator, enters a first-stage leaching system, is precipitated under the action of gravity and centrifugal force, coarse sand with the water content of less than 25% is discharged through a sludge discharge system, and the rest components enter a second-stage leaching system. (3) Secondary leaching: after the first-stage leaching of the polluted soil, the polluted soil enters a second-stage leaching system, the polluted soil is precipitated under the action of gravity and centrifugal force, the middlings with the water content not higher than 65% are discharged through a sludge discharge system, and the rest components enter a third-stage leaching system. (3) Third-stage leaching: after the first-stage leaching and the second-stage leaching of the polluted soil, the polluted soil enters a third-stage leaching system, is precipitated under the action of gravity and centrifugal force, fine sand with the water content not higher than 65% is discharged through a sludge discharge system, and the rest components enter a wastewater treatment system. (4) And (3) terminal processing: and after the polluted soil passes through the three-stage leaching system, the residual wastewater enters the wastewater treatment system to be treated and recycled after reaching the standard, and the sludge discharged by the wastewater treatment system is treated by a unit with hazardous waste treatment qualification according to the hazardous waste commission.
Example 1
In a heavy metal polluted site, the common water level of underground water is 1.2m, the upper layer is 0-0.7m of miscellaneous fill, and the lower layer is 0.7-6.0m of silty clay. The concentration ranges of the heavy metal pollution nickel and arsenic in the land parcel soil are 1250.42-3376.81mg/kg and 89.33-179.16mg/kg respectively, and the maximum pollution depth is 4.3 m. The amount of pollution is 5894m3And the original water content of the soil is about 44 percent. Pollute soil and sieve the back through the excavation, adopt the utility model provides a drip washing system, design and handle the prescription and be 5m3H, the leaching method is carried out in sequence according to the utility model, and the leaching is carried out in 62 days on siteAnd finally, smoothly finishing the repairing and processing work of all the polluted soil of the project, comparing the concentrations of heavy metals in the soil before and after leaching with the following table, and displaying according to the result that the system has a relatively effective leaching effect on the high-water-content polluted clay.
TABLE 1 comparison of heavy metal concentrations in soil before and after leaching
| Heavy metals | Concentration Range before Leaching (mg/kg) | Concentration range after elution (mg/kg) |
| Arsenic (As) | 89.33-179.16 | 10.14-22.37 |
| Nickel (II) | 1250.42-3376.81 | 307.19-643.45 |
Example 2
In a heavy metal polluted site in a certain city, the common water level of underground water is 0.6m, and the site is mainly silty clay. The post-stage planning of the site is residential and commercial sites, the concentration ranges of main pollutants are 31.08-102.6mg/kg, 468.13-1258.71mg/kg and 9.2-25.53mg/kg, and the maximum pollution depth of the site is 6.1 m. The amount of pollution is 18043m3And the original water content of the soil is about 53 percent. The field construction adopts the utility model provides a drip washing system, design and handle the prescription volume and be 10m3And h, according to the utility model, the leaching method is carried out in sequence, and finally the project is smoothly completed and qualified through one-time detection.The heavy metal concentration contrast of this project contaminated soil drip washing front and back is shown in the following table, according to the testing result, the utility model provides a system and method are to the contaminated clay drip washing effect preferred of this project.
TABLE 2 comparison of heavy metal concentrations in soil before and after leaching
| Heavy metals | Concentration Range before Leaching (mg/kg) | Concentration range after elution (mg/kg) |
| Cadmium (Cd) | 31.08-102.6 | 2.46-10.53 |
| Lead (II) | 468.13-1258.71 | 93.22-261.74 |
| Hexavalent chromium | 9.2-25.53 | 0.33-1.06 |
Example 3
In a polluted site of a certain commercial power plating old site, the underground water level of the site is buried for about 1.0m, the upper layer is 0-0.6m of cement terrace and miscellaneous filling soil, and the lower layer is silty clay. The characteristic pollutants are hexavalent chromium and arsenic, the concentration ranges are 7.22-31.43 and 49.63-97.70mg/kg respectively, and the maximum pollution depth is 5.1 m. The amount of the pollution is 24894m3And the original water content of the soil is about 49 percent. After the polluted soil is excavated and screened, the leaching system in the embodiment 2 is adopted, and the method is as followsThe leaching method provided by the utility model is used for on-site construction, and all the work contents of the project are smoothly completed through the tension construction of nearly 6 months. According to sampling and submitting before and after the leaching, the result shows that the system has a relatively effective leaching effect on the high-water-content polluted clay.
TABLE 3 comparison of heavy metal concentrations in soil before and after washing
| Heavy metals | Concentration Range before Leaching (mg/kg) | Concentration range after elution (mg/kg) |
| Hexavalent chromium | 7.22-31.43 | 2.44-5.19 |
| Arsenic (As) | 49.63-97.70 | 3.26-11.73 |
In conclusion, the embodiments show that when the device and the method provided by the patent are used for leaching and repairing the high-moisture-content polluted clay, the problems that the device is difficult to normally operate, the leaching effect is poor and the like in the existing repairing industry can be effectively solved.
Claims (1)
1. The leaching system suitable for the high-water-content heavy metal polluted clay is characterized by sequentially comprising a first-stage leaching grading system (1), a second-stage leaching grading system (2), a third-stage leaching grading system (3), a wastewater treatment system (4) and a medicament preparation system (5); after being screened by a screening machine, directly feeding polluted soil with the particle size of not more than 5cm into a first-stage leaching grading system, then sequentially pumping the polluted soil into a second-stage leaching grading system and a third-stage leaching grading system by a self-priming pump, finally, enabling upper-layer effluent to enter wastewater treatment equipment and then recycling the effluent, and dividing the polluted soil into coarse sand, medium sand and fine sand by the third-stage leaching grading system;
the primary leaching grading system (1) sequentially comprises a primary leaching tank using a first leaching agent, primary feeding equipment, a primary stirring motor and a primary sludge discharge equipment dewatering screen;
the secondary leaching grading system (2) sequentially comprises a secondary leaching tank using a second leaching agent, secondary feeding equipment, a secondary stirring motor and a secondary sludge discharge equipment plate-and-frame filter press;
the three-stage leaching grading system (3) sequentially comprises a three-stage leaching tank using a third leaching agent, three-stage feeding equipment, a three-stage stirring motor and a three-stage sludge discharge equipment plate-and-frame filter press;
the wastewater treatment system (4) is a typical heavy metal wastewater treatment system;
the agent preparation system (5) comprises a leaching agent preparation pool and a water treatment agent preparation pool.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110842018A (en) * | 2019-12-03 | 2020-02-28 | 上海康恒环境修复有限公司 | Leaching system and method suitable for high-water-content heavy metal polluted clay |
| CN113732034A (en) * | 2021-09-09 | 2021-12-03 | 上海环境保护有限公司 | Heavy metal contaminated soil device is handled in drip washing of increasing benefit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110842018A (en) * | 2019-12-03 | 2020-02-28 | 上海康恒环境修复有限公司 | Leaching system and method suitable for high-water-content heavy metal polluted clay |
| CN113732034A (en) * | 2021-09-09 | 2021-12-03 | 上海环境保护有限公司 | Heavy metal contaminated soil device is handled in drip washing of increasing benefit |
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