CN109759429B - Soil leaching and drying device suitable for heavy metal contaminated soil remediation - Google Patents
Soil leaching and drying device suitable for heavy metal contaminated soil remediation Download PDFInfo
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- CN109759429B CN109759429B CN201910085465.4A CN201910085465A CN109759429B CN 109759429 B CN109759429 B CN 109759429B CN 201910085465 A CN201910085465 A CN 201910085465A CN 109759429 B CN109759429 B CN 109759429B
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Abstract
The invention discloses a soil leaching and drying device suitable for repairing heavy metal contaminated soil, which comprises a leaching chamber, a drying chamber and a liquid distribution barrel, wherein a spiral feeding belt, a plurality of spray heads and a water receiving disc are arranged in the leaching chamber; the drying chamber is internally provided with a standing conveyor belt, a vacuum pump and a heating device for raising the temperature in the drying chamber, the standing conveyor belt is connected with an outlet of the spraying chamber, a movable door is arranged at the part of the standing conveyor belt, which penetrates through the outlet, and the vacuum pump is used for keeping negative pressure in the drying chamber to reduce the boiling point of water. The soil leaching and drying device suitable for repairing the heavy metal contaminated soil has the advantages of being high in efficiency and saving cost.
Description
Technical Field
The invention relates to soil remediation, in particular to a soil leaching and drying device suitable for remediation of heavy metal contaminated soil.
Background
In the prior art, soil is a material foundation for sustainable development of the economy and the society, and the protection of the soil environment is an important content for promoting ecological civilization construction.
Among the heavily contaminated pollutants, heavy metals are the main pollution source. Due to human activities, the content of trace metal elements in soil exceeds a background value, excessive deposition causes the content of heavy metals in the soil to be too high, and the soil is polluted by the heavy metals. The heavy metal is metal with specific gravity equal to or greater than 5.0, and mainly comprises elements with obvious biological toxicity such as cadmium, mercury, lead, chromium, metalloid arsenic and the like, and elements with certain toxicity such as zinc, copper, nickel and the like. The pollution elements mainly come from pesticides, waste water, sludge, atmospheric precipitation and the like, for example, cadmium and lead pollution mainly comes from smelting emission and automobile waste gas precipitation, mercury mainly comes from mercury-containing waste water, and arsenic is widely used as an insecticide, a bactericide, a rodenticide and a herbicide. Excessive heavy metal can cause physiological dysfunction and nutritional disorder of plants, the enrichment coefficient of elements such as cadmium, mercury and the like in crop seeds is higher, even if the enrichment coefficient exceeds the food sanitation standard, the growth, development and yield of crops are not influenced, and in addition, mercury and arsenic can weaken and inhibit the activities of nitrifying and ammonifying bacteria in soil and influence the nitrogen supply. Heavy metal pollutants have low mobility in soil, are not degraded by microorganisms, and have great potential harm after entering human bodies through food chains. In some mines, a stone dumping site and a tailing pond are not established in the process of mining, waste stones and tailings are randomly stacked, so that heavy metals which are rich in difficult to solve enter soil, and in addition, metal waste residues left after ore processing enter an underground water system along with rainwater, so that serious heavy metal pollution of the soil is caused. There are 10 metal elements really classified into heavy metals industrially: copper, lead, zinc, tin, nickel, cobalt, antimony, mercury, cadmium and bismuth. From the perspective of the soil-plant system, the international academy considers that only cadmium, cobalt, selenium and other elements pose the greatest risk of harm to animal and human health. The major health risks to humans due to the food chain are cadmium and selenium.
The current mainstream soil remediation method is chemical treatment, and is called a leaching treatment method for heavy metal contaminated soil with application number of CN201810086251.4, a remediation method is disclosed, soil is remediated by leaching the soil, but in practical use, the existing leaching machine does not recycle the soil by washing, so that the usage amount of the leaching agent is large, the cost of soil remediation is increased, after leaching is completed, the soil to be dehydrated can enter the step of final backfilling after waiting for a long time for dehydration, the soil remediation efficiency is slow, and the labor cost is increased in a phase-changing manner.
Disclosure of Invention
The invention aims to solve the technical problems and provides the soil leaching and drying device which is high in efficiency, saves cost and is suitable for repairing the heavy metal contaminated soil.
The invention is realized by the following technical scheme:
a soil leaching and drying device suitable for heavy metal contaminated soil remediation comprises a leaching chamber, a drying chamber and a liquid distribution barrel, wherein a spiral feeding belt, a plurality of spray heads and a water receiving disc are arranged in the leaching chamber, flanges are arranged on two sides of the feeding belt, a water leakage port is formed in the lowest layer of the feeding belt, the water receiving disc is arranged below the feeding belt, a water outlet of the water receiving disc is connected with a first water pump, the liquid distribution barrel is connected with a second water pump, and the first water pump and the second water pump are connected to the spray heads in parallel; the drying chamber is internally provided with a standing conveyor belt, a vacuum pump and a heating device for raising the temperature in the drying chamber, the standing conveyor belt is connected with an outlet of the spraying chamber, a movable door is arranged at the part of the standing conveyor belt, which penetrates through the outlet, and the vacuum pump is used for keeping negative pressure in the drying chamber to reduce the boiling point of water.
Preferably, the resting conveyor belt is spiral or zigzag shaped.
Preferably, the heating device is an electric heating wire, the heating device is arranged in the peripheral side wall of the drying chamber, and the bottom surface of the drying chamber is provided with a water leakage pipeline which can be opened and closed.
Preferably, a dry-wet temperature sensor is arranged in the drying chamber, and the dry-wet temperature sensor is in signal connection with a vacuum pump and a heating device.
Preferably, the water pan is provided with an acid-base inductor for inducing the concentration of the test solution, and the acid-base inductor is in control connection with the second water pump.
Preferably, the first water pump and the second water pump are both provided with check valves.
Preferably, the liquid level meter is arranged in the liquid preparation barrel, and the liquid level meter is in signal connection with the alarm device.
Preferably, the device also comprises a mixing cavity, stirring paddles arranged in the mixing cavity and a stirring motor, wherein the first water pump and the second water pump are connected in parallel to form the mixing cavity, the mixing cavity is connected with a spray head, and the stirring motor drives the stirring paddles.
Preferably, the shower nozzle device further comprises a rotating main pipe erected at the top of the shower chamber through a bearing, the mixing cavity is communicated with the rotating main pipe, the nozzle heads are annularly distributed on the rotating main pipe, and the nozzle heads are uniformly inclined towards one side.
Preferably, the first water pump and the second water pump are metering pumps.
The beneficial effects are that: compared with the prior art, the soil leaching and drying device suitable for repairing the heavy metal contaminated soil is provided with the leaching chamber, the drying chamber and the liquid preparation barrel; a spiral feeding belt, a plurality of spray heads and a water receiving disc are arranged in the leaching chamber, flanges are arranged on two sides of the feeding belt to prevent water flow from leaking from two sides, so that soil located on a spiral lower layer cannot be leached, a water leaking port is formed in the lowest layer of the feeding belt, when the leaching liquid flows to the lowest layer of the feeding belt and is discharged through the water leaking port, the water receiving disc is arranged below the feeding belt to collect leaching liquid, a water outlet of the water receiving disc is connected with a first water pump, a liquid distribution barrel is connected with a second water pump, the first water pump and the second water pump are connected to the spray heads in parallel, the first water pump and the second water pump can be metering pumps which supply brand new and recovered leaching liquid in a certain proportion, the leaching liquid is recycled for multiple times, the utilization rate is improved, and the repair cost is reduced; be provided with the conveyer belt that stews in the drying chamber, vacuum pump and be used for promoting the heating device of the interior temperature of drying chamber, the export of drenching and washing room is connected to the conveyer belt that stews, the part that the conveyer belt that stews passed the export is provided with the dodge gate, open the dodge gate promptly when needs conveying material, close the dodge gate when needs are dried, thereby it reduces the moisture boiling point to make to keep the negative pressure in the drying chamber through the vacuum pump, thereby make heating device need not to heat the drying chamber and also can make moisture fast drying to a very high temperature, and energy is saved, and the whole repair efficiency is also improved.
Drawings
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:
FIG. 1 is a schematic structural diagram of a soil leaching and drying device suitable for heavy metal contaminated soil remediation, according to the present invention;
fig. 2 is a view a-a of fig. 1.
Detailed Description
As shown in fig. 1 and 2, a soil leaching and drying device suitable for heavy metal contaminated soil remediation comprises a leaching chamber 1, a drying chamber 2 and a liquid preparation barrel 3 filled with leacheate;
a spiral upper material belt 11, a plurality of spray heads 12 and a water receiving disc 13 are arranged in the leaching chamber 1, flanges 111 are arranged on two sides of the upper material belt 11 to prevent water from leaking from two sides, so that soil located on a spiral lower layer cannot be leached, a water leaking port 112 is arranged on the lowest layer of the upper material belt 11, when leaching liquid flows to the lowest layer of the upper material belt 11, the leaching liquid is discharged through the water leaking port 112, the water receiving disc 13 is arranged below the upper material belt 11 to collect leaching liquid, a water outlet 131 of the water receiving disc 13 is connected with a first water pump 132, a liquid distribution barrel 3 is connected with a second water pump 31, the first water pump 132 and the second water pump 31 are connected to the spray heads 12 in parallel, the first water pump 132 and the second water pump 31 can be metering pumps, the first water pump 132 and the second water pump 31 can supply brand new and recovered leaching liquid in a certain proportion together, the leaching liquid is circulated for multiple times, the utilization rate is improved, and the repair cost is reduced;
be provided with conveyer belt 21 that stews in drying chamber 2, vacuum pump 22 and be used for promoting the heating device 23 of drying chamber 2 internal temperature, conveyer belt 21 that stews connects the export 14 of drenching chamber 1, the part that conveyer belt 21 that stews passed export 14 is provided with dodge gate 211, dodge gate 211 is opened promptly when needs conveying material, dodge gate 211 is closed when needs are dried, thereby it reduces the moisture boiling point to make to keep the negative pressure in drying chamber 2 through vacuum pump 22, make heating device 23 need not to heat drying chamber 2 and also can make moisture dry fast to a very high temperature, and energy is saved, the holistic repair efficiency has also been improved.
In a preferred embodiment, as shown in fig. 1, the stationary conveyor belt 21 is spiral or zigzag, so as to fully utilize the space and save the volume of the drying chamber 2.
In a preferred embodiment, as shown in fig. 1, the heating device 23 is an electric heating wire, which is simple in structure and low in cost, the heating device 23 is disposed in the peripheral side wall 24 of the drying chamber 2 to prevent moisture leakage and ensure safety, the bottom surface 25 of the drying chamber 2 is provided with an openable water leakage pipeline 251, the water leakage pipeline 251 can be opened and closed by using an electromagnetic valve, when negative pressure of the vacuum pump 22 is needed, the water leakage pipeline 251 is closed by the electromagnetic valve, when soil moisture is more in self-dripping, the vacuum pump 22 does not need to be opened first, and at this time, the water leakage pipeline 251 can be opened to discharge the moisture.
In a preferred embodiment, as shown in fig. 1, a dry-wet temperature sensor 26 is disposed in the drying chamber 2, and the dry-wet temperature sensor 26 is in signal connection with the vacuum pump 22 and the heating device 23, not only to control the temperature, but also to detect the dry-wet condition inside so that the vacuum pump 22 can make adjustments in time to make the pressure slightly larger or smaller.
In a preferred embodiment, as shown in fig. 1, the water pan 13 is provided with an acid-base sensor 133 for sensing the concentration of the test solution, the acid-base sensor 133 is connected to the second water pump 31 in a control manner, and the second water pump 31 is controlled to output a certain amount of brand new eluent according to the concentration of the eluent recovered by the water pan 13, so that the cost is effectively saved and the elution quality is ensured.
In a preferred embodiment, as shown in fig. 1, the first water pump 132 and the second water pump 31 are both provided with check valves 4 to prevent the eluent from flowing backwards, thereby ensuring the safety of the system.
In a preferred embodiment, as shown in fig. 1, the washing machine further comprises an alarm device 5, a liquid level meter 32 is arranged in the liquid preparation barrel 3, the liquid level meter 32 is in signal connection with the alarm device 5, and the alarm device 5 can be an audible and visual alarm to remind an operator of replenishment when the eluting agent is insufficient, so as to avoid ineffective elution.
In a preferred embodiment, as shown in fig. 1, the rinsing apparatus further includes a mixing cavity 123, a stirring paddle 124 and a stirring motor 125, the mixing cavity 123 is connected in parallel with the first water pump 132 and the second water pump 31, the mixing cavity 123 is connected to the spray head 12, and the stirring motor 125 drives the stirring paddle 124, so that the brand-new and the recovered rinsing agent are fully and uniformly mixed and then sprayed out from the spray head 12, so that the rinsing quality is stable; can install the rotating main pipe 126 additional in addition, the rotating main pipe 126 sets up at the bearing and erects at the 1 top of shower room, mixes and holds chamber 123 intercommunication rotating main pipe 126, and shower nozzle 12 is the annular and distributes on rotating main pipe 126 to shower nozzle 12 is unified towards one side skew, and when shower nozzle 12 blowout eluent, recoil makes rotating main pipe 126 rotatory around self axis, thereby guarantees that shower nozzle 12 can spray each corner, makes the drip washing effectual.
The above embodiments are only for illustrating the technical solutions of the present invention and are not limited thereto, and any modification or equivalent replacement without departing from the spirit and scope of the present invention should be covered within the technical solutions of the present invention.
Claims (10)
1. The utility model provides a soil drip washing drying device suitable for heavy metal contaminated soil is restoreed which characterized in that: the device comprises a spray washing chamber (1), a drying chamber (2) and a liquid distribution barrel (3), wherein a spiral material feeding belt (11), a plurality of spray heads (12) and a water receiving disc (13) are arranged in the spray washing chamber (1), flanges (111) are arranged on two sides of the material feeding belt (11), a water leakage port (112) is formed in the lowest layer of the material feeding belt (11), the water receiving disc (13) is arranged below the material feeding belt (11), a water outlet (131) of the water receiving disc (13) is connected with a first water pump (132), the liquid distribution barrel (3) is connected with a second water pump (31), and the first water pump (132) and the second water pump (31) are connected to the spray heads (12) in parallel;
be provided with conveyer belt (21), vacuum pump (22) and be used for promoting of stewing in drying chamber (2) heating device (23) of temperature, conveyer belt (21) of stewing connects export (14) of shower-cleaning room (1), the part that conveyer belt (21) of stewing passed export (14) is provided with dodge gate (211), thereby makes through vacuum pump (22) keep the negative pressure in drying chamber (2) and reduce the moisture boiling point.
2. The soil washing and drying device suitable for heavy metal contaminated soil remediation according to claim 1, wherein: the standing conveyor belt (21) is spiral or zigzag.
3. The soil washing and drying device suitable for heavy metal contaminated soil remediation according to claim 1, wherein: heating device (23) are electric heating wire, heating device (23) set up in lateral wall (24) all around drying chamber (2), bottom surface (25) of drying chamber (2) are provided with open closed hourglass water piping (251).
4. The soil washing and drying device suitable for heavy metal contaminated soil remediation according to claim 1, wherein: and a dry-wet temperature sensor (26) is arranged in the drying chamber (2), and the dry-wet temperature sensor (26) is in signal connection with the vacuum pump (22) and the heating device (23).
5. The soil washing and drying device suitable for heavy metal contaminated soil remediation according to any one of claims 1 to 4, wherein: the water pan (13) is provided with an acid-base inductor (133) for inducing the concentration of the test solution, and the acid-base inductor (133) is in control connection with the second water pump (31).
6. The soil washing and drying device suitable for heavy metal contaminated soil remediation according to any one of claims 1 to 4, wherein: the first water pump (132) and the second water pump (31) are both provided with check valves (4).
7. The soil washing and drying device suitable for heavy metal contaminated soil remediation according to any one of claims 1 to 4, wherein: still include alarm device (5), be provided with level gauge (32) in joining in marriage liquid bucket (3), level gauge (32) signal connection alarm device (5).
8. The soil washing and drying device suitable for heavy metal contaminated soil remediation according to any one of claims 1 to 4, wherein: the spray head type stirring device is characterized by further comprising a mixing cavity (123), stirring paddles (124) and a stirring motor (125), wherein the stirring paddles (124) and the stirring motor (125) are arranged in the mixing cavity (123), the first water pump (132) and the second water pump (31) are connected in parallel to the mixing cavity (123), the mixing cavity (123) is connected with the spray head (12), and the stirring motor (125) drives the stirring paddles (124).
9. The soil washing and drying device suitable for heavy metal contaminated soil remediation according to claim 8, wherein: the spray head device is characterized by further comprising a rotating main pipe (126) erected at the top of the shower room (1) through a bearing, the mixing cavity (123) is communicated with the rotating main pipe (126), the spray heads (12) are annularly distributed on the rotating main pipe (126), and the spray heads (12) are uniformly inclined towards one side.
10. The soil washing and drying device suitable for heavy metal contaminated soil remediation according to any one of claims 1 to 4, wherein: the first water pump (132) and the second water pump (31) are metering pumps.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910085465.4A CN109759429B (en) | 2019-01-29 | 2019-01-29 | Soil leaching and drying device suitable for heavy metal contaminated soil remediation |
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| CN201910085465.4A CN109759429B (en) | 2019-01-29 | 2019-01-29 | Soil leaching and drying device suitable for heavy metal contaminated soil remediation |
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| CN109759429A CN109759429A (en) | 2019-05-17 |
| CN109759429B true CN109759429B (en) | 2022-05-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100534067B1 (en) * | 2003-10-21 | 2005-12-07 | 주식회사 오이코스 | Soil washing method and facility for physical separation and remediation of polluted soil |
| CN201848424U (en) * | 2010-11-11 | 2011-06-01 | 南京市环境保护科学研究院 | Contaminated soil leaching remediation equipment |
| CN202924889U (en) * | 2012-12-03 | 2013-05-08 | 成都源创环保工程有限公司 | Sludge circular drying device |
| CN103316903B (en) * | 2013-03-21 | 2016-04-06 | 珠海市中科信息技术开发有限公司 | The chemical combined leaching repairing method of a kind of heavy-metal contaminated soil |
| CN203678833U (en) * | 2013-12-25 | 2014-07-02 | 天津生态城环保有限公司 | Equipment for remedying heavy metal contaminated soil by leaching and electrodeposition combined process |
| CN204342742U (en) * | 2014-12-30 | 2015-05-20 | 惠生（南京）清洁能源股份有限公司 | The device of heavy petrol in splitting gas is reclaimed in a kind of MTO olefin cracking device |
| CN108637000B (en) * | 2016-05-12 | 2020-07-07 | 杭州富阳何氏化纤助剂有限公司 | Soil remediation device for removing omethoate components in farmland soil |
| CN106890847B (en) * | 2017-04-06 | 2018-05-01 | 浙江益壤环保科技有限公司 | A kind of soil repair system and method based on process integration |
| CN207680951U (en) * | 2017-12-12 | 2018-08-03 | 山东省环科院环境工程有限公司 | A kind of soil heterotopic elution device |
| CN109013464A (en) * | 2018-06-28 | 2018-12-18 | 广西浙缘农业科技有限公司 | A kind of quartz sand cleaning system |
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Denomination of invention: A soil leaching and drying device suitable for heavy metal contaminated soil remediation Effective date of registration: 20230615 Granted publication date: 20220527 Pledgee: Hunan Xiangjiang New Area Rural Commercial Bank Co.,Ltd. Pledgor: HUNAN NEWWORLD SCIENCE AND TECHNOLOGY Co.,Ltd. Registration number: Y2023980044115 |