CN104973632A - Soil and underground water landfill leachate pollution in-situ remediation simulation device - Google Patents
Soil and underground water landfill leachate pollution in-situ remediation simulation device Download PDFInfo
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- CN104973632A CN104973632A CN201510271549.9A CN201510271549A CN104973632A CN 104973632 A CN104973632 A CN 104973632A CN 201510271549 A CN201510271549 A CN 201510271549A CN 104973632 A CN104973632 A CN 104973632A
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Abstract
The invention discloses a soil and underground water landfill leachate pollution in-situ remediation simulation device. The device comprises an inlet water tank, a landfill leachate seepage tank, multiple levels of permeable reactive grids, an aquitard, an aquifer and water outlet pipes. A plurality of small holes are provided on the bottom of the landfill leachate seepage tank. Pollution plume blocking boards, perforated walls, sieve boards and a connection pipe are arranged on the multiple levels of permeable reactive grids. A plurality of outlet water pipes are connected to the end of the device. The level number n of the multiple levels of permeable reactive grids is determined according to the physiochemical characteristics of the landfill leachate and according to a remediation target. n is an integer. With the device, the difference between a landfill leachate pollution soil and underground water in-situ remediation laboratory simulation environment and an actual site remediation environment is reduced; the situation of soil and underground water landfill leachate pollution in-situ remediation can be reflected more accurately; and objective theoretical references are provided for project applications of the soil and underground water landfill leachate pollution in-situ remediation technology.
Description
Technical field
The present invention relates to a kind of pollution plot simulator, relate more specifically to a kind of soil and underground water Landfill Leachate Pollution in-situ immobilization simulator.
Background technology
Soil and underground water are the precious resources that the mankind depend on for existence.Since entering industrialization society, just there is the pollution problem of soil and underground water, and start aggravation last century 60, the seventies.In view of the seriousness of soil and groundwater pollution, the developed country such as American-European has dropped into a large amount of manpower and materials and has studied contaminated soil and groundwater remediation technology.Contaminated soil is divided into showering and in-situ immobilization two kinds from groundwater remediation technology according to the different of processing mode.
Conventional soil pollution showering technology by contaminated soil excavation, transhipment, stacking, purification, and then utilizes.This showering not only processing cost is high, and is difficult to administer deep soil and soil and all contaminated place of underground water, cannot repair the contaminated soil below buildings or the contaminated site near important building.
Early stage groundwater remediation adopts dystopy process, as pump-and-treat system method.This technology is passed through the pollution pinnule in seizure underground water and is extracted out ground, then adopts other treatment technology to use after Water warfare or to re-enter underground.The Polluted area of underground water can control in out well upstream by pump-and-treat system method effectively, but the application result and the research that process underground water at the scene show, want thoroughly to repair the underground water polluted, pump-and-treat system system often will run several years even decades, the enormous costs such as the power consumption required for it, equipment operation and maintenance.In addition, be the ground settlement preventing a large amount of extraction of underground water from causing, also need employing to pour in down a chimney technology, be more the increase in capital consumption.
Therefore, soil and groundwater pollution based technique for in-situ remediation are the focuses of current soil and underground water pollution control technical study, and not only processing costs is saved relatively, but also can reduce soil surface treatment facility, reduce the disturbance to environment.
Permeable reactive barrier is a passive in-situ treatment district, and the reaction material filling in treatment zone can be degraded and be detained the pollution components flowed through in the underground water of this body of wall, thus reaches reparation object.Compared with other based technique for in-situ remediation, its great advantage is without any need for additionaling power device, ground processing facility, and Active reaction medium consumption is very slow, reparation usefulness can be played long-term effectively, except initial stage installation and long term monitoring are to observe except repairing effect, need other any expense hardly.
At present, the soil of the developed countries such as America and Europe and underground water Landfill Leachate Pollution based technique for in-situ remediation are comparatively ripe also have been put into operation, and the research of China is still in the experimental study stage, mainly comprises place applied research and laboratory study at present.Before the application of place, laboratory study is the necessary stage evaluating certain recovery technique.Most of laboratory study simulates the motion of Polluted Groundwater in waterbearing stratum by column test and analyzes the removal usefulness of pollutent, but this mode soil of simulating and underground water in-situ immobilization environment and actual environment still have larger gap.
Summary of the invention
For above-mentioned technical problem, main purpose of the present invention is to provide a kind of soil and underground water Landfill Leachate Pollution in-situ immobilization simulator, to reduce polluted soil and the gap between underground water in-situ immobilization simulated environment and actual environment, more relevantly reflect soil and underground water Landfill Leachate Pollution in-situ immobilization situation, can provide objective theoretical reference for the engineer applied of soil and underground water Landfill Leachate Pollution based technique for in-situ remediation.
To achieve these goals, present invention employs following technical scheme:
The invention provides a kind of soil and underground water Landfill Leachate Pollution in-situ immobilization simulator, described simulator comprises pump sump, percolate seepage groove, monitor well, multistage permeable reactive barrier, aquitard, waterbearing stratum and rising pipe, it is characterized in that
The other parts of described pump sump and described simulator use sieve plate to separate, and described floor lever of sieve tray is stained with high-density nylon screen;
Described aquitard and waterbearing stratum, be formed in the described simulator except pump sump;
Described percolate seepage slot, in the front end of the described simulator except pump sump, is provided with some apertures, penetrates through for percolate bottom it;
Multiple monitor well, dispersed placement in the described simulator except pump sump, for monitoring described simulator;
Some multistage permeable reactive barriers, be arranged in the water (flow) direction in the described simulator except pump sump, described multistage permeable reactive barrier by Pollution Plume catching sheet, first step permeable reactive barrier, second stage permeable reactive barrier until n-th grade of permeable reactive barrier forms, the progression n of wherein said multistage permeable reactive barrier determines according to percolate physicochemical characteristic and reparation target, and n is natural number;
Some rising pipes, are positioned at the end of described simulator.
Wherein, the percolate taken from on-the-spot percolate or manually prepare according to percolate composition is marked with in described percolate seepage groove.
Wherein, be provided with on-line monitoring equipment in described monitor well, dynamic monitoring water level, flow velocity, temperature, pH, dissolved oxygen, specific conductivity and redox potential, described monitor well different depths place is provided with stopple coupon.
Wherein, other region of described simulator except pump sump is followed successively by upper, middle and lower-ranking from top, the clay that upper and lower two-layer filling particle diameter is less than 0.25mm forms aquitard, and middle layer is filled with the grains of sand formation waterbearing stratum that particle diameter is 0.5 ~ 2.0mm.
The head height of wherein said rising pipe regulates according to actual needs.
Wherein, described Pollution Plume catching sheet is made up of the water proof material that physicochemical property are stable, and described Pollution Plume catching sheet and described first step permeable reactive barrier outer wall are tightly connected, and in the vertical described aquitard inserted bottom waterbearing stratum.
Wherein, the arc wall area that be less than 180 ° of described first step permeable reactive barrier between described Pollution Plume catching sheet is provided with some apertures, and described arc wall region surface is stained with high-density nylon screen; All the other regions of described first step permeable reactive barrier wall are the water proof material that physicochemical property are stable;
Described first step permeable reactive barrier internal vertical inserts two pieces of sieve plates, is reaction filler between described sieve plate; And
Front end sieve plate entirety is provided with some apertures, and bottom the sieve plate of rear end, 1/3rd regions are provided with some apertures, and described floor lever of sieve tray is stained with high-density nylon screen.
Wherein, described first step permeable reactive barrier is connected by several pipe connectings with follow-up second stage permeable reactive barrier;
Described second stage permeable reactive barrier internal vertical inserts two pieces of sieve plates, is reaction filler between described sieve plate;
Sieve plate entirety described in two pieces is equipped with some apertures, and described floor lever of sieve tray is stained with high-density nylon screen; And
What in the permeable reactive barrier of the described second stage, rear end sieve plate was corresponding be less than 180 ° of arc wall area is provided with some apertures, described arc wall region surface is stained with high-density nylon screen, and all the other regions of described second stage permeable reactive barrier wall are the water proof material that physicochemical property are stable.
Wherein, when multistage permeable reactive barrier progression n is greater than 2, use second stage permeable reactive barrier as last step grid; Adjacent two-stage permeable reactive barrier is connected by several pipe connectings; Permeable reactive barrier wall between the first step and last step is impervious materials, and described permeable reactive barrier internal vertical inserts two pieces of sieve plates, is reaction filler between described sieve plate; Front end sieve plate entirety is provided with some apertures, and bottom the sieve plate of rear end, 1/3rd regions are provided with some apertures, and described floor lever of sieve tray is stained with high-density nylon screen.
Wherein, the mesh of described high-density nylon screen is between 200-800 order.
Known based on technique scheme, tool of the present invention has the following advantages and beneficial effect: (1) apparatus structure of the present invention is simply ingenious, makes simple, easy to operate, with low cost; (2) the sum of series reaction medium reacting grid in device of the present invention can adjust flexibly, and the underground water based technique for in-situ remediation be applicable to by different properties Landfill Leachate Pollution is studied; (3) apparatus of the present invention simulate soil and underground water Landfill Leachate Pollution in-situ immobilization environment, comprise the action mode of aeration zone waterbearing stratum hydrogeological characteristics, seepage action of ground water situation, percolate leakage pollution process and permeable reactive barrier, theoretical reference can be provided for the engineer applied of soil and underground water Landfill Leachate Pollution based technique for in-situ remediation.
Accompanying drawing explanation
Fig. 1 is the orthographic plan of pollution in-situ immobilization simulator of the present invention;
Fig. 2 is the A-A sectional view of pollution in-situ immobilization simulator of the present invention;
Fig. 3 is 7,8-node diagrams of pollution in-situ immobilization simulator of the present invention;
Fig. 4 is the 9-node diagram of pollution in-situ immobilization simulator of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in further detail.
The principle of work of pollution in-situ immobilization simulator of the present invention is: underground water is injected pump sump by certain flow, by controlling pump sump elevation of water surface simulation piestic water or table water aquifer.With certain flow, percolate is injected percolate seepage groove, percolate is to seepage in aeration zone and waterbearing stratum.Underground water enters aeration zone and waterbearing stratum in the mode of seepage flow from pump sump, Pollution Plume is mixed to form with the percolate of seepage, tackled by reaction grid afterwards, finally flow out from rising pipe, complete the simulation process of whole soil and underground water Landfill Leachate Pollution in-situ immobilization thus.
More specifically, the invention discloses a kind of soil and underground water Landfill Leachate Pollution in-situ immobilization simulator, as shown in the orthographic plan of Fig. 1 and the A-A sectional view of Fig. 2, described simulator comprise pump sump 1, percolate seepage groove 3, monitor well 2, Pollution Plume catching sheet 4, multistage permeable reactive barrier 5,6, aquitard 12, waterbearing stratum 13 and rising pipe 11.Wherein, permeable reactive barrier is provided with perforated wall 7, sieve plate 8,9 and pipe connecting 10.
Pump sump 1 and device other parts use sieve plate to separate, and sieve plate 8-9 surface is stained with high-density nylon screen.
Establish some apertures bottom percolate seepage groove 3, be wherein marked with and take from on-the-spot percolate, or according to the percolate that percolate composition is manually prepared.
On-line monitoring equipment is provided with, dynamic monitoring water level, flow velocity, temperature, pH, dissolved oxygen, specific conductivity and redox potential in monitor well 2.Monitor well different depths place arranges stopple coupon.
Other region of device except pump sump is followed successively by upper, middle and lower-ranking from top, and upper and lower two-layer filling particle diameter is less than the clay of 0.25mm, and middle layer is filled with the coarse sand that particle diameter is 0.5 ~ 2.0mm.
Device end connects 3 rising pipes 11, and outlet pipeline outlet water at tail end open height can regulate.
Multistage permeable reactive barrier is made up of Pollution Plume catching sheet 4, one-level permeable reactive barrier 5, secondary permeable reactive barrier 6 and n-th grade of permeable reactive barrier.The progression of multistage permeable reactive barrier is determined according to percolate physicochemical characteristic and reparation target.
Pollution Plume catching sheet 4 is made up of the water proof material that physicochemical property are stable, and catching sheet and first step permeable reactive barrier outer wall are tightly connected, and aquitard bottom vertical insertion waterbearing stratum.
The be less than 180 ° arc wall area of one-level permeable reactive barrier 5 between Pollution Plume catching sheet establish some apertures, and this region surface is stained with high-density nylon screen; All the other regions of grid wall are the water proof material that physicochemical property are stable.One-level permeable reactive barrier internal vertical inserts two pieces of sieve plate 8-9, is reaction filler between sieve plate; As shown in 7, the 8-node diagrams of Fig. 3 and the 9-node diagram of Fig. 4, front end sieve plate 8 entirety establishes some apertures, and bottom rear end sieve plate 9, some apertures are established in 1/3rd regions, and floor lever of sieve tray is stained with high-density nylon screen.
One-level permeable reactive barrier 5 is connected by 3 pipe connectings 10 with follow-up secondary permeable reactive barrier 6.Secondary permeable reactive barrier internal vertical inserts two pieces of sieve plates 9, is reaction filler between sieve plate; Two pieces of sieve plate entirety all establish some apertures, and floor lever of sieve tray is stained with high-density nylon screen.What in secondary permeable reactive barrier, rear end sieve plate was corresponding be less than 180 ° of arc wall area establishes some apertures, and this region surface is stained with high-density nylon screen; All the other regions of grid wall are the water proof material that physicochemical property are stable.
When multistage permeable reactive barrier progression is greater than 2, secondary permeable reactive barrier 6 is as last step grid.Adjacent two-stage permeable reactive barrier is connected by 3 pipe connectings 10.Grid wall between the first step and last step is impervious materials, and grid internal vertical inserts two pieces of sieve plate 8-9, is reaction filler between sieve plate; Front end sieve plate 8 entirety establishes some apertures, and bottom rear end sieve plate 9, some apertures are established in 1/3rd regions, and floor lever of sieve tray is stained with high-density nylon screen.
In the present invention, other region of device except pump sump is followed successively by upper, middle and lower-ranking from top, upper and lower two-layer filling particle diameter is less than the clay of 0.25mm, simulates the less aquitard 12 (aeration zone and water proof base plate) of permeability coefficient respectively; Middle layer is filled with the coarse sand that particle diameter is 0.5 ~ 2.0mm, the waterbearing stratum 13 that simulation permeability coefficient is larger, and waterbearing stratum is pressed along the uneven layout of gradient, thus more close to actual place characteristics on Aquifer.
Even cloth hole on perforate wall and sieve plate, aperture is 3-5mm, and pitch of holes is 5-10mm; It is 200-800 object nylon screen that perforate wall and floor lever of sieve tray are stained with aperture.The Main Function of the perforate wall and sieve plate that are stained with nylon screen prevents clay and coarse sand from entering tank and reaction grid, prevents reacting the reaction mediums such as the filler in grid and enter aeration zone and waterbearing stratum.
Dose dissimilar reaction filler in reaction grid, the sum of series reaction wire feeding of reaction grid is determined by percolate physicochemical characteristic and reparation target.The Main Function of reaction grid utilizes active media to repair Landfill Leachate Pollution underground water.
In the present invention, rising pipe water outlet height is adjustable, regulates pump sump water level thus.When pump sump water level is higher than top, waterbearing stratum, simulate piestic water water level 14 thus; When pump sump water level is lower than top, waterbearing stratum, simulated diving water level 15 thus.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. soil and a underground water Landfill Leachate Pollution in-situ immobilization simulator, described simulator comprises pump sump, percolate seepage groove, monitor well, multistage permeable reactive barrier, aquitard, waterbearing stratum and rising pipe, it is characterized in that,
The other parts of described pump sump and described simulator use sieve plate to separate, and described floor lever of sieve tray is stained with high-density nylon screen;
Described aquitard and waterbearing stratum, be formed in the described simulator except pump sump;
Described percolate seepage slot, in the front end of the described simulator except pump sump, is provided with some apertures, penetrates through for percolate bottom it;
Multiple monitor well, dispersed placement in the described simulator except pump sump, for monitoring described simulator;
Some multistage permeable reactive barriers, be arranged in the water (flow) direction in the described simulator except pump sump, described multistage permeable reactive barrier by Pollution Plume catching sheet, first step permeable reactive barrier, second stage permeable reactive barrier until n-th grade of permeable reactive barrier forms, the progression n of wherein said multistage permeable reactive barrier determines according to percolate physicochemical characteristic and reparation target, and n is natural number;
Some rising pipes, are positioned at the end of described simulator.
2. soil as claimed in claim 1 and underground water Landfill Leachate Pollution in-situ immobilization simulator, be marked with the percolate taken from on-the-spot percolate or manually prepare according to percolate composition in wherein said percolate seepage groove.
3. soil as claimed in claim 1 and underground water Landfill Leachate Pollution in-situ immobilization simulator, on-line monitoring equipment is provided with in wherein said monitor well, dynamic monitoring water level, flow velocity, temperature, pH, dissolved oxygen, specific conductivity and redox potential, described monitor well different depths place is provided with stopple coupon.
4. soil as claimed in claim 1 and underground water Landfill Leachate Pollution in-situ immobilization simulator, other region of described simulator wherein except pump sump is followed successively by upper, middle and lower-ranking from top, the clay that upper and lower two-layer filling particle diameter is less than 0.25mm forms aquitard, and middle layer is filled with the grains of sand formation waterbearing stratum that particle diameter is 0.5 ~ 2.0mm.
5. soil as claimed in claim 1 and underground water Landfill Leachate Pollution in-situ immobilization simulator, the head height of wherein said rising pipe regulates according to actual needs.
6. soil as claimed in claim 1 and underground water Landfill Leachate Pollution in-situ immobilization simulator, wherein said Pollution Plume catching sheet is made up of the water proof material that physicochemical property are stable, described Pollution Plume catching sheet and described first step permeable reactive barrier outer wall are tightly connected, and in the vertical described aquitard inserted bottom waterbearing stratum.
7. soil as claimed in claim 6 and underground water Landfill Leachate Pollution in-situ immobilization simulator, the arc wall area that be less than 180 ° of wherein said first step permeable reactive barrier between described Pollution Plume catching sheet is provided with some apertures, and described arc wall region surface is stained with high-density nylon screen; All the other regions of described first step permeable reactive barrier wall are the water proof material that physicochemical property are stable;
Described first step permeable reactive barrier internal vertical inserts two pieces of sieve plates, is reaction filler between described sieve plate; And
Front end sieve plate entirety is provided with some apertures, and bottom the sieve plate of rear end, 1/3rd regions are provided with some apertures, and described floor lever of sieve tray is stained with high-density nylon screen.
8. soil as claimed in claim 7 and underground water Landfill Leachate Pollution in-situ immobilization simulator, wherein said first step permeable reactive barrier is connected by several pipe connectings with follow-up second stage permeable reactive barrier;
Described second stage permeable reactive barrier internal vertical inserts two pieces of sieve plates, is reaction filler between described sieve plate;
Sieve plate entirety described in two pieces is equipped with some apertures, and described floor lever of sieve tray is stained with high-density nylon screen; And
What in the permeable reactive barrier of the described second stage, rear end sieve plate was corresponding be less than 180 ° of arc wall area is provided with some apertures, described arc wall region surface is stained with high-density nylon screen, and all the other regions of described second stage permeable reactive barrier wall are the water proof material that physicochemical property are stable.
9. soil as claimed in claim 8 and underground water Landfill Leachate Pollution in-situ immobilization simulator, wherein when multistage permeable reactive barrier progression n is greater than 2, uses second stage permeable reactive barrier as last step grid; Adjacent two-stage permeable reactive barrier is connected by several pipe connectings; Permeable reactive barrier wall between the first step and last step is impervious materials, and described permeable reactive barrier internal vertical inserts two pieces of sieve plates, is reaction filler between described sieve plate; Front end sieve plate entirety is provided with some apertures, and bottom the sieve plate of rear end, 1/3rd regions are provided with some apertures, and described floor lever of sieve tray is stained with high-density nylon screen.
10. soil as claimed in claim 9 and underground water Landfill Leachate Pollution in-situ immobilization simulator, the mesh of wherein said high-density nylon screen is between 200-800 order.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106517407A (en) * | 2016-12-06 | 2017-03-22 | 成都理工大学 | Method for remedying polluted groundwater in refuse landfill with PRB (permeable reactive barrier) technology |
| CN110947752A (en) * | 2019-12-25 | 2020-04-03 | 中国电建集团中南勘测设计研究院有限公司 | In-situ chemical oxidation remediation device for simulating polluted underground water and using method |
| WO2021004143A1 (en) * | 2019-07-05 | 2021-01-14 | 中国科学院南京土壤研究所 | Method for constructing groundwater monitoring well in prb wall |
| CN112718830A (en) * | 2020-12-09 | 2021-04-30 | 森特士兴集团股份有限公司 | Soil and groundwater restoration simulation system based on in-situ steam injection |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106517407A (en) * | 2016-12-06 | 2017-03-22 | 成都理工大学 | Method for remedying polluted groundwater in refuse landfill with PRB (permeable reactive barrier) technology |
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| CN110947752A (en) * | 2019-12-25 | 2020-04-03 | 中国电建集团中南勘测设计研究院有限公司 | In-situ chemical oxidation remediation device for simulating polluted underground water and using method |
| CN112718830A (en) * | 2020-12-09 | 2021-04-30 | 森特士兴集团股份有限公司 | Soil and groundwater restoration simulation system based on in-situ steam injection |
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