CN211699457U - Chromium pollution groundwater remediation analogue means - Google Patents
Chromium pollution groundwater remediation analogue means Download PDFInfo
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- CN211699457U CN211699457U CN202020349716.3U CN202020349716U CN211699457U CN 211699457 U CN211699457 U CN 211699457U CN 202020349716 U CN202020349716 U CN 202020349716U CN 211699457 U CN211699457 U CN 211699457U
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Abstract
The utility model relates to the technical field of groundwater treatment, in particular to a chromium-polluted groundwater remediation simulation device, which comprises a raw water tank, a water outlet tank and an osmotic reaction grid simulation column; the upper end of the permeable reactive barrier simulation column is provided with a water outlet, the lower end of the permeable reactive barrier simulation column is provided with a water inlet, the raw water tank is communicated with the water inlet, and the effluent water tank is communicated with the water outlet; a first filling layer, a second filling layer and a third filling layer are sequentially arranged inside the permeable reactive barrier simulation column along the direction from the water inlet to the water outlet; the first filling layer and the third filling layer are filled with one or two of quartz sand or pebbles; the second filling layer filler is a mixture of basic oxygen converter waste slag and quartz sand. The device utilizes the waste residue of the basic oxygen converter as a filling layer, reduces the cost of a reaction medium of the permeable reaction grid, realizes the reutilization of the waste residue of the basic oxygen converter, provides high resource utilization rate and reduces waste sludge pollution.
Description
Technical Field
The utility model belongs to the technical field of the groundwater processing technique and specifically relates to a chromium pollutes groundwater remediation analogue means is related to.
Background
Chromium metal is one of the most common detected metal elements in surface water, underground water and industrial sites, and chromium has different valence states under different conditions in the environment, and has different chemical behaviors and toxicity. Trivalent chromium in the water body can be adsorbed on solid matters and exists in sediments, and hexavalent chromium is mostly dissolved in water and is relatively stable. Wherein, the hexavalent chromium has the greatest toxicity, is proved to be carcinogenic, teratogenic and mutagenic pollutants by research, and uses CrO in water4 2-And HCrO4 -And the like. In recent years, with the rapid development of economy and industry, underground water in China and even in many areas all over the world is polluted by heavy metal chromium in different degrees, and the health of residents is seriously threatened.
The permeable reaction grille is an underground water in-situ remediation technology with wide application prospect, which is emerging in recent years and can effectively convert hexavalent chromium into more stable trivalent chromium with lower toxicity. This treatment can be established directly with the reaction medium iron (e.g., zero valent iron) or indirectly by adding a medium that serves to stimulate a secondary treatment process (e.g., by adding a carbon source and nutrient salts to stimulate the activity of the activated microorganisms), with contaminants being removed by physical, chemical, and biological processes in the osmotic reaction grid. However, the high cost of the reaction medium in the permeable reaction grid limits the practical application of the permeable reaction grid, and the search for an efficient and economical reaction medium has become a hot point problem for the application and popularization of the permeable reaction grid technology.
The waste sludge of the basic oxygen converter is waste slag generated in the steelmaking process of the basic oxygen converter, along with the development of the steel industry, the discharge amount of the waste slag is also enlarged year by year, a large amount of waste slag is wasted and accumulated, the waste slag occupies farmlands, pollutes the environment and becomes a public hazard in the society.
Therefore, in order to reduce the cost of the reaction medium in the permeable reaction grid and improve the utilization rate of the waste slag of the basic oxygen converter, a novel simulation device for in-situ remediation of chromium-polluted underground water is urgently needed to be developed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an use alkaline oxygen converter waste residue as reaction medium's chromium pollution groundwater normal position to restore analogue means to solve the problem that reaction medium cost is high, alkaline oxygen converter waste residue polluted environment in the permeable reaction grid that exists among the prior art.
The utility model provides a chromium-polluted groundwater remediation simulation device, which comprises a raw water tank, a water outlet tank and a permeable reactive barrier simulation column;
the upper end of the permeable reactive barrier simulation column is provided with a water outlet, the lower end of the permeable reactive barrier simulation column is provided with a water inlet, the raw water tank is communicated with the water inlet, and the effluent water tank is communicated with the water outlet;
a first filling layer, a second filling layer and a third filling layer are sequentially arranged inside the permeable reactive barrier simulation column along the direction from the water inlet to the water outlet;
the first filling layer and the third filling layer are filled with quartz sand, pebbles or quartz pebbles;
the filler of the second filling layer is converter waste quartz.
The utility model discloses a groundwater remediation simulation device, which comprises a raw water tank, a water outlet tank and an osmotic reaction grid simulation column, wherein the raw water tank is communicated with a water inlet of the osmotic reaction grid simulation column, the water outlet tank is communicated with a water outlet of the osmotic reaction grid simulation column, the osmotic reaction grid simulation column is sequentially provided with a first filling layer, a second filling layer and a third filling layer along the direction from the water inlet to the water outlet, wherein, the fillers of the first filling layer and the third filling layer are quartz sand, pebble or quartz pebble, wherein the quartz pebble refers to a mixture obtained by mixing the quartz sand and the pebble in any proportion, namely, the first filling layer and the third filling layer can be a quartz sand layer and a pebble layer which are filled in sequence, and can also be a filling material obtained by mixing quartz sand and pebbles, and the second filling layer is converter waste residue quartz, wherein the converter waste residue quartz refers to a mixture obtained by mixing basic oxygen converter waste residue and quartz sand in any proportion. The filler quartz sand and pebbles are used as a filter medium, and water with high turbidity can pass through the first filling layer under a certain pressure, so that suspended matters, organic matters, colloidal particles, microorganisms, chlorine, odor, partial heavy metal ions and the like in the water can be effectively intercepted and removed. The mixture of the basic oxygen converter waste residue and the quartz sand is used as the second filling layer, so that the cost of a reaction medium in the existing permeable reaction grid can be greatly reduced, the utilization rate of the basic oxygen converter waste residue is improved, and meanwhile, the quartz sand and the basic oxygen converter waste residue are matched for use, so that the water conductivity of the filler can be ensured, and the service life of the device is prolonged.
Further, still include pH automatic monitoring adjusting part, pH automatic monitoring adjusting part sets up on the raw water tank.
Hexavalent chromium is reduced into trivalent chromium by the waste slag of the basic oxygen converter, and the conversion rate is higher under a specific pH value, so that a pH automatic monitoring and adjusting part can be arranged on a raw water tank, the pH value of the raw water can be monitored in real time by the pH automatic monitoring and adjusting part, and the pH value of the raw water can be regulated and controlled in time. In order to ensure higher reaction efficiency, the pH value of the raw water tank is controlled to be 4.8-5.5.
Furthermore, the middle part of the simulation column of the permeable reactive barrier is provided with an online pressure monitor, an online pH monitor and an online temperature monitor.
For better monitoring the reduction condition of hexavalent chromium in the simulation column of the permeable reactive barrier, the middle part of the simulation column of the permeable reactive barrier is provided with an online pressure monitor, an online pH monitor and an online temperature monitor, so that the pH value and the temperature value in the reaction process can be monitored in real time, the pressure of the simulation column can be timely regulated and controlled according to the monitored value, the hydraulic condition of better internal part of the simulation column of the permeable reactive barrier can be obtained, and higher treatment efficiency can be obtained.
Further, the online monitoring system also comprises a first online chromium monitor and a second online chromium monitor;
the first chromium online monitor is arranged on the raw water tank;
and the second chromium on-line monitor is arranged on the water outlet tank.
In order to monitor the conversion rate of the restoration simulation device to hexavalent chromium, a first chromium online monitor is arranged on the raw water tank, and a second chromium online monitor is arranged on the water outlet tank.
Further comprises a first flow monitor and a second flow monitor,
the first flow monitor is arranged between the water outlet and the water outlet tank;
the second flow monitor is arranged between the water inlet and the raw water tank.
In order to monitor the water inlet flow and the water outlet flow of the permeable reactive barrier simulation column, a second flow monitor is arranged between the raw water tank and the water inlet, and a first flow monitor is arranged between the water outlet tank and the water outlet.
Further, the automatic monitoring and adjusting device comprises a central automatic control system, wherein the pH automatic monitoring and adjusting component, the pressure online monitor, the pH online monitor, the temperature online monitor, the first chromium online monitor, the second chromium online monitor, the first flow monitor and the second flow monitor are electrically connected with the central automatic control system.
In order to realize the automatic operation of the whole underground water restoration simulation device, the device further comprises a central automatic control system, and the pH automatic monitoring and adjusting component, the pressure online monitor, the pH online monitor, the temperature online monitor, the first chromium online monitor, the second chromium online monitor, the first flow monitor and the second flow monitor are all electrically connected with the central automatic control system. The central automatic control system can collect relevant data in real time and make adjustments in time.
Further, a water distributor is arranged at the water inlet.
In order to ensure the water distribution effect, a water distributor is arranged at the water inlet.
Further, the ratio of the basic oxygen converter waste slag to the quartz sand in the second filling layer is (5-8): (2-5).
And (3) adjusting the proportion of the basic oxygen converter waste slag and the quartz sand in the second filling layer to (5-8): (2-5), not only can improve the hydraulic conductivity of the simulation column, but also can not influence the treatment effect of the waste water polluted by the chromium from the basic oxygen converter.
Further, along the direction from the water inlet to the water outlet, the first filling layer comprises a first pebble layer and a first quartz sand layer, and the third filling layer comprises a second quartz sand layer and a second pebble layer;
the filling particle size of the quartz sand is 0.8-2.0mm, and the filling particle size of the pebble layer is 5.0-30.0 mm;
the ratio of the filling particle size of the quartz sand to the inner diameter of the permeable reactive barrier simulation column is less than 1: 60;
the filling thickness ratio of the first pebble layer, the first quartz sand layer, the second filling layer, the second quartz sand layer and the second pebble layer is 1:2:5:2: 1.
Along the direction from the water inlet to the water outlet, the first filling layer comprises a first pebble layer and a first quartz sand layer, the third filling layer comprises a second quartz sand layer and a second pebble layer, the filling thickness ratio of the first pebble layer, the first quartz sand layer, the second filling layer, the second quartz sand layer and the second pebble layer is 1:2:5:2:1, the filling thickness ratio can improve the water outlet rate and ensure the removal rate of hexavalent chromium, and compared with the traditional zero-valent iron reaction medium, the operation cost is reduced by more than 40%. The ratio of the filling grain size of the quartz sand to the inner diameter of the penetration reaction grid simulation column is less than 1:60, so that the wall flow effect of the simulation column can be effectively reduced, the difference between the flow condition and the mass transfer condition of the wall of the simulation column and the main fluid is reduced, the close contact between the filling medium in the column and the chromium-containing wastewater is further improved, and the treatment effect is improved.
Furthermore, a plurality of sampling ports are formed in the penetration reaction grating simulation column along the direction from the water inlet to the water outlet;
the sampling port and the water outlet are both filled with filter screens, and the aperture of each filter screen is 0.5-0.8 mm.
For the treatment effect of different stages in the real-time monitoring simulation column on chromium pollution waste water, a plurality of sampling ports are arranged on the simulation column of the permeable reactive barrier along the direction from the water inlet to the water outlet, so that operators can sample conveniently. The sampling port and the water outlet are filled with filter screens, the aperture of each filter screen is 0.5-0.8mm, and the filter screens can remove impurities in the water body, so that the influence of the impurities on the accuracy of a detection result is avoided.
The utility model provides a chromium pollutes groundwater and restores analogue means compares with prior art, has following advantage:
the utility model discloses a simulator is restoreed to groundwater includes raw water tank, goes out water tank and infiltration reaction grid analog column, when using the device to restore chromium pollution groundwater, in the raw water tank polluted groundwater by chromium gets into infiltration reaction grid analog column, under the effect of basic oxygen converter waste residue and quartz sand mixture, hexavalent chromium is reduced to trivalent chromium in the groundwater, and the groundwater after the processing is discharged through the delivery port. The device utilizes the waste residue of the basic oxygen converter as a filling layer, reduces the cost of a reaction medium of the permeable reaction grid, realizes the reutilization of the waste residue of the basic oxygen converter, provides the resource utilization rate and reduces the pollution of waste mud.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of the chromium-polluted groundwater remediation simulation device.
Description of reference numerals:
1: a raw water tank; 2: a water outlet tank; 3: a permeable reactive barrier simulation column; 4: a water outlet; 5: a water inlet; 6: a second filling layer; 7: a pH automatic monitoring and adjusting component; 8: a pressure on-line monitor; 9: a pH on-line monitor; 10: a temperature on-line monitor; 11: a first chromium on-line monitor; 12: a second chromium on-line monitor; 13: a first flow monitor; 14: a second flow monitor; 15: a central autonomous system; 16: a water distributor; 17: a first pebble layer; 18: a first quartz sand layer; 19: a second quartz sand layer; 20: a second pebble layer; 21: a sampling port; 22: a peristaltic pump.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the simulation device for repairing chromium-polluted groundwater of the utility model comprises a raw water tank 1, a water outlet tank 2 and a penetration reaction grid simulation column 3; the upper end of the permeable reactive barrier simulation column 3 is provided with a water outlet 4, the lower end of the permeable reactive barrier simulation column is provided with a water inlet 5, the raw water tank 1 is communicated with the water inlet 5, and the water outlet tank 2 is communicated with the water outlet 4; along the direction from the water inlet 5 to the water outlet 4, a first filling layer, a second filling layer 6 and a third filling layer are sequentially arranged inside the permeable reactive barrier simulation column 3; the first filling layer and the third filling layer are filled with quartz sand, pebbles or quartz pebbles; the filler of the second filling layer 6 is converter waste quartz.
When the device is used for repairing chromium-polluted underground water, the chromium-polluted underground water firstly enters the raw water tank 1, then enters the permeable reaction grating simulation column 3 under the action of the peristaltic pump 22, hexavalent chromium in the underground water is reduced into trivalent chromium under the action of a mixture of the waste residue of the basic oxygen converter and quartz sand, and the treated underground water is discharged to the water outlet tank 2 through the water outlet 4. The device has the advantages of compact structure, simple operation, high operating efficiency, low operating cost and strong adaptability, can realize the reutilization of the waste residue of the basic oxygen converter, improves the resource utilization rate and reduces the pollution of the waste residue to the environment.
On the basis of the above technical solution, it is further preferable that the system further includes an automatic pH monitoring and adjusting unit 7, and the automatic pH monitoring and adjusting unit 7 is disposed on the raw water tank 1.
When the mixture of the basic oxygen converter waste residue and the quartz sand in the penetration reaction grid simulation column 3 is used for treating the chromium-containing wastewater, the treatment effect is best when the pH of the wastewater is controlled to be 4.8-5.5, so that an automatic pH monitoring and adjusting part 7 is required to be arranged on the raw water tank 1 to monitor and adjust the pH of the wastewater to be treated in real time. Of course, the pH range may be increased or decreased as appropriate depending on the water quality of the contaminated groundwater.
On the basis of the technical scheme, preferentially, the middle part of the permeable reactive barrier simulation column 3 is provided with an online pressure monitor 8, an online pH monitor 9 and an online temperature monitor 10.
The pH value in the reaction process can be adjusted by adjusting the pH value of the water body in the raw water tank 1 and can also be adjusted in a filling layer of a mixture of waste slag of the basic oxygen converter and quartz sand, and when the pH value is adjusted in the filling layer, the middle part of the simulation column 3 of the permeable reactive barrier is provided with an online pressure monitor 8, an online pH monitor 9 and an online temperature monitor 10.
In order to monitor the treatment efficiency of the restoration simulation device on the chromium-containing polluted wastewater in real time, the restoration simulation device also comprises a first chromium online monitor 11 and a second chromium online monitor 12; the first chromium online monitor 11 is arranged on the raw water tank 1; the second chromium on-line monitor 12 is arranged on the water outlet tank 2, and probes of the first chromium on-line monitor 11 and the second chromium on-line monitor 12 are respectively positioned below the liquid level 2/3 depths of the raw water tank 1 and the water outlet tank 2. The monitoring result shows that the average removal rate of hexavalent chromium in the operation process of the device is 85-95%, the removal amount of hexavalent chromium by the mixture of the basic oxygen converter waste residue and the quartz sand in unit mass (g) can reach 0.218mg of hexavalent chromium, and the operation cost is reduced by more than 40% compared with the traditional zero-valent iron reaction medium.
On the basis of the above technical solution, preferably, the system further comprises a first flow monitor 13 and a second flow monitor 14, wherein the first flow monitor 13 is arranged between the water outlet 4 and the outlet water tank 2; the second flow rate monitor 14 is provided between the water inlet 5 and the raw water tank 1.
The water flow in the osmosis reaction simulation column flows upwards by adopting pressure, a second flow monitor 14 can be arranged between the raw water tank 1 and the water inlet 5, a first flow monitor 13 is arranged between the water outlet tank 2 and the water outlet 4, and the water inlet flow rate can be set to be 0.15-0.25L/h during operation.
In order to improve the automation degree of the repairing simulation column device, the repairing simulation column device further comprises a central automatic control system 15, the pH automatic monitoring and adjusting component 7, the pressure online monitor 8, the pH online monitor 9, the temperature online monitor 10, the first chromium online monitor 11, the second chromium online monitor 12, the first flow monitor 13 and the second flow monitor 14 are electrically connected with the central automatic control system 15.
The central automatic control system 15 monitors the water pressure, pH and water inflow and outflow in the middle reaction area of the permeable reactive barrier simulation column 3 in real time and automatically adjusts the water pressure, pH and water inflow and outflow to ensure the hydraulic conditions and treatment effect inside the permeable reactive barrier simulation column 3.
In order to improve the water distribution effect of the device, a water distributor 16 is arranged at the water inlet 5.
When the proportion of the basic oxygen converter waste slag and the quartz sand in the second filling layer 6 is (5-8): and (2-5), the water conductivity of the simulation column can be improved, and the treatment effect of the waste slag of the basic oxygen converter on chromium-polluted wastewater cannot be influenced.
On the basis of the above technical solution, more preferably, along the direction from the water inlet 5 to the water outlet 4, the first filling layer comprises a first pebble layer 17 and a first quartz sand layer 18, and the third filling layer comprises a second quartz sand layer 19 and a second pebble layer 20; the filling particle size of the quartz sand is 0.8-2.0mm, and the filling particle size of the pebble layer is 5.0-30.0 mm; the ratio of the filling particle size of the quartz sand to the inner diameter of the permeable reactive barrier simulation column 3 is less than 1: 60; the filling thickness ratio of the first pebble layer 17, the first quartz sand layer 18, the second filling layer 6, the second quartz sand layer 19 and the second pebble layer 20 is 1:2:5:2: 1.
In the first filling layer and the third filling layer, the quartz sand and the pebbles can be integrally combined into a whole, or the quartz sand and the pebbles can be divided into two layers, namely, along the direction from the water inlet 5 to the water outlet 4, the first filling layer comprises a first pebble layer 17 and a first quartz sand layer 18, the third filling layer comprises a second quartz sand layer 19 and a second pebble layer 20, and the filling thickness ratio of the first pebble layer 17, the first quartz sand layer 18, the second filling layer 6, the second quartz sand layer 19 and the second pebble layer 20 is 1:2:5:2: 1. The filling thickness proportion can not only improve the water yield, but also ensure the removal rate of hexavalent chromium. In order to effectively reduce the wall flow effect of the simulation column and reduce the difference between the flow condition and the mass transfer condition of the wall of the simulation column and the main fluid, thereby improving the close contact between the filling medium in the column and the chromium-containing wastewater and improving the treatment effect, the ratio of the filling grain diameter of the quartz sand to the inner diameter of the simulation column 3 of the permeable reactive barrier is less than 1: 60.
On the basis of the above preferred technical scheme, further, along the direction from the water inlet 5 to the water outlet 4, a plurality of sampling ports 21 are further formed on the permeable reactive barrier simulation column 3; the sampling port 21 and the water outlet 4 are both filled with filter screens, and the aperture of each filter screen is 0.5-0.8 mm.
On the basis of the above preferred technical scheme, further, the utility model discloses the pipeline that uses is corrosion-resistant material pipeline.
On the basis of the above preferred technical scheme, further, the utility model discloses the quartz sand filling material that uses can choose for use zeolite, active carbon, limestone etc. to replace according to the quality of water demand.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (9)
1. A chromium-polluted underground water remediation simulation device is characterized by comprising a raw water tank (1), a water outlet tank (2) and a permeable reactive barrier simulation column (3);
a water outlet (4) is formed in the upper end of the permeable reactive barrier simulation column (3), a water inlet (5) is formed in the lower end of the permeable reactive barrier simulation column, the raw water tank (1) is communicated with the water inlet (5), and the water outlet tank (2) is communicated with the water outlet (4);
a first filling layer, a second filling layer (6) and a third filling layer are sequentially arranged inside the permeable reactive barrier simulation column (3) along the direction from the water inlet (5) to the water outlet (4);
the first filling layer and the third filling layer are filled with quartz sand, pebbles or quartz pebbles;
the filler of the second filling layer (6) is converter waste quartz.
2. The simulator according to claim 1, further comprising an automatic pH monitoring and adjusting member (7), wherein the automatic pH monitoring and adjusting member (7) is provided on the raw water tank (1).
3. The simulation apparatus according to claim 2, wherein the middle part of the permeable reactive barrier simulation column (3) is provided with an online pressure monitor (8), an online pH monitor (9) and an online temperature monitor (10).
4. The simulation apparatus according to claim 3, further comprising a first chrome on-line monitor (11) and a second chrome on-line monitor (12);
the first chromium online monitor (11) is arranged on the raw water tank (1);
the second chromium on-line monitor (12) is arranged on the water outlet tank (2).
5. Simulation device according to claim 4, further comprising a first flow monitor (13) and a second flow monitor (14),
the first flow monitor (13) is arranged between the water outlet (4) and the water outlet tank (2);
the second flow monitor (14) is arranged between the water inlet (5) and the raw water tank (1).
6. The simulation apparatus according to claim 5, further comprising a central autonomous system (15), wherein the pH automatic monitoring and adjusting unit (7), the pressure on-line monitor (8), the pH on-line monitor (9), the temperature on-line monitor (10), the first chromium on-line monitor (11), the second chromium on-line monitor (12), the first flow monitor (13), and the second flow monitor (14) are electrically connected to the central autonomous system (15).
7. Simulation device according to claim 1, wherein a water distributor (16) is arranged at the water inlet (5).
8. Simulation device according to claim 7, wherein, in the direction from the water inlet (5) to the water outlet (4), the first filling layer comprises a first pebble layer (17) and a first quartz sand layer (18), and the third filling layer comprises a second quartz sand layer (19) and a second pebble layer (20);
the filling particle size of the quartz sand is 0.8-2.0mm, and the filling particle size of the pebble layer is 5.0-30.0 mm;
the ratio of the filling particle size of the quartz sand to the inner diameter of the permeable reactive barrier simulation column (3) is less than 1: 60;
the filling thickness ratio of the first pebble layer (17), the first quartz sand layer (18), the second filling layer (6), the second quartz sand layer (19) and the second pebble layer (20) is 1:2:5:2: 1.
9. The simulation device according to claim 1, wherein a plurality of sampling ports (21) are further formed on the permeable reactive barrier simulation column (3) along the direction from the water inlet (5) to the water outlet (4);
the sampling port (21) and the water outlet (4) are both filled with filter screens, and the pore diameters of the filter screens are 0.5-0.8 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020349716.3U CN211699457U (en) | 2020-03-19 | 2020-03-19 | Chromium pollution groundwater remediation analogue means |
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| CN202020349716.3U CN211699457U (en) | 2020-03-19 | 2020-03-19 | Chromium pollution groundwater remediation analogue means |
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