CN110927021A - Underground water pollutant reaction migration simulation device and use method thereof - Google Patents
Underground water pollutant reaction migration simulation device and use method thereof Download PDFInfo
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- CN110927021A CN110927021A CN202010000608.XA CN202010000608A CN110927021A CN 110927021 A CN110927021 A CN 110927021A CN 202010000608 A CN202010000608 A CN 202010000608A CN 110927021 A CN110927021 A CN 110927021A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/04—Investigating osmotic effects
Abstract
The invention provides a reaction and migration simulation device for underground water pollutants and a use method thereof. The reaction migration simulation effect of pollutants under various underground water flow velocity conditions can be realized by changing and adjusting the rotating speed of the peristaltic pump, a group of devices can obtain a plurality of groups of simulation results under control conditions, the control effect of the flow velocity on the reaction migration characteristics of the pollutants in the underground water is researched according to the difference of water chemical parameters obtained by the devices under different flow velocity conditions, and a basis is further provided for the flow velocity control of leaching when target pollutants in the underground water are repaired.
Description
Technical Field
The invention belongs to the technical field of groundwater pollution remediation, and particularly relates to a groundwater pollutant reaction migration simulation device and a use method thereof.
Background
Groundwater is an important water resource and has important values for human production, life and ecological environment, and is a main or even only drinking water source in many areas of China. However, the current situation of groundwater pollution in China is not optimistic, and according to the publication of 2017 China ecological environment conditions, in 5100 groundwater water quality monitoring sites across the country in 2017, the worse groundwater level and the worst groundwater level account for 67%.
The method is very important for implementing groundwater pollution remediation by accurately simulating the actions of adsorption, migration, transformation and the like of pollutants in groundwater, and the indoor soil column experiment is an effective means for simulating groundwater pollutants. Most of the existing soil column devices simulate a single variable in a groundwater pollutant reaction system, and cannot simulate groundwater pollutant reaction migration behaviors under the condition of changing control conditions, however, the groundwater flow velocity is mostly changed when groundwater remediation is carried out, and meanwhile, the groundwater flow velocity is a key parameter for controlling the groundwater remediation effect, so that a groundwater pollutant reaction migration simulation device capable of changing the groundwater flow velocity is urgently needed to be designed.
Disclosure of Invention
The invention aims to solve the problem that the existing soil column simulation device cannot simulate the reaction and migration behavior of underground water pollutants under the condition of changing control.
Therefore, the invention provides a reaction and migration simulation device for underground water pollutants, which comprises a liquid supply container, a speed-regulating peristaltic pump, a soil column reaction mechanism and a solution collecting mechanism which are sequentially connected through a liquid supply pipe, wherein a simulated underground aqueous solution is contained in the liquid supply container, a liquid inlet is formed in the bottom of the soil column reaction mechanism, a liquid outlet is formed in the top of the soil column reaction mechanism, and a simulated soil medium is filled in the soil column reaction mechanism.
Further, the earth pillar reaction mechanism includes the earth pillar support and is used for the organic glass post of splendid attire simulation soil medium, and organic glass post fixed mounting is on the earth pillar support, and the lower extreme of organic glass post is passed through the feed tube and is connected with the play liquid end of speed governing peristaltic pump, and the upper portion of organic glass post is passed through the feed tube and is collected the mechanism with the solution and be connected.
Furthermore, gravel buffer layers are arranged above and below the simulated soil medium in the organic glass column, and the simulated soil medium and the gravel buffer layers are separated through nylon nets.
Furthermore, a layer of nylon net is laid on the top and the bottom of the organic glass column.
Further, the solution collecting mechanism includes an automatic portion collector, and a graduated solution collecting bottle provided on the automatic portion collector.
In addition, the invention also provides a use method of the underground water pollutant reaction migration simulation device, which comprises the following steps:
1) filling a simulated soil medium in the soil column reaction mechanism;
2) connecting the filled soil column reaction mechanism with a speed-regulating peristaltic pump, filling simulated underground aqueous solution into a liquid supply container, setting the initial rotating speed of the speed-regulating peristaltic pump, closing a liquid supply pipe connected with the liquid outlet side of the soil column reaction mechanism, starting the speed-regulating peristaltic pump to saturate, and ensuring that simulated soil media in the soil column reaction mechanism are in a saturated state;
3) after water saturation is finished, a liquid outlet of the earth pillar reaction mechanism is communicated with the solution collection mechanism, the initial rotating speed of the speed-regulating peristaltic pump is kept, a group of samples are taken from the solution collection mechanism, and indexes in the simulated underground water solution are analyzed and tested to serve as the initial solution concentration of the earth pillar;
4) changing and adjusting the rotating speed of the peristaltic pump, setting the timing collection time of the solution collection mechanism by combining the flow corresponding to the rotating speed, continuously leaching the simulated soil medium in the soil column reaction mechanism by using the simulated underground water solution containing the target pollutant, sampling by the solution collection mechanism, and immediately testing the water chemistry indexes such as pH, conductivity, oxidation-reduction potential, target pollutant concentration and the like.
Further, the soil column reaction mechanism in the step 1) is filled by a dry method, and the specific process is as follows: firstly, paving a 100-mesh nylon net at the bottom of an organic glass column, filling 1.5cm thick gravel with the particle size of 1-2 cm as a gravel buffer layer, and lining the 100-mesh nylon net; and then filling 20cm simulated soil media by adopting a layered equal-mass filling method, wherein each layer is 1cm, the simulated soil media are arranged in 20 layers, a nylon net with 100 meshes is paved on the filled simulated soil media, small gravels with the thickness of 1.5cm and the particle size of 1-2 mm are continuously filled to serve as a gravel buffer layer, a layer of nylon net with 100 meshes is lined, and finally the top plate is placed on the gravel buffer layer and embedded in the organic glass column.
Compared with the prior art, the invention has the beneficial effects that:
(1) the reaction migration simulation device for the underground water pollutants can achieve the reaction migration simulation effect of the pollutants under various underground water flow velocity conditions by changing and adjusting the rotating speed of the peristaltic pump, and one group of devices can obtain a plurality of groups of simulation results under control conditions, so that the control effect of the flow velocity on the reaction migration characteristics of the pollutants in the underground water is researched according to the difference of water chemical parameters obtained by the devices under different flow velocity conditions, and a basis is provided for the flow velocity control of leaching when target pollutants in the underground water are repaired.
(2) The reaction and migration simulation device for the underground water pollutants provided by the invention can also replace simulated underground water solution or the simulated soil medium in the soil column in particle size or lithology, realize the simulation effect under different underground water environments and different porous medium conditions, and enlarge the application range of the simulation device.
(3) The reaction and migration simulation device for the underground water pollutants, provided by the invention, is simple to operate and strong in controllability, and the solution collecting mechanism adopts an automatic partial collector, so that the automation degree of the simulation device is further improved, and the manpower and material resources are further saved in the aspect of sample acquisition.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of a groundwater contaminant reaction migration simulation apparatus according to the present invention.
Description of reference numerals: 1. a liquid supply container; 2. a liquid supply tube; 3. adjusting the peristaltic pump; 4. a soil column support; 5. an organic glass column; 6. a solution collection bottle; 7. an automated fraction collector.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1, the present embodiment provides a simulation apparatus for reaction and migration of underground water pollutants, which includes a liquid supply container 1, a speed-regulating peristaltic pump 3, an earth pillar reaction mechanism and a solution collecting mechanism, which are sequentially connected through a liquid supply pipe 2, wherein a simulated underground water solution is contained in the liquid supply container 1, a liquid inlet is arranged at the bottom of the earth pillar reaction mechanism, a liquid outlet is arranged at the top of the earth pillar reaction mechanism, and a simulated soil medium is filled in the earth pillar reaction mechanism. In the embodiment, a simulated soil medium in the simulated underground water solution leaching soil column reaction mechanism containing the target pollutant is used, the control of the flow speed of the simulated underground water solution in the leaching process is realized by adjusting the rotating speed of the speed-regulating peristaltic pump 3, the simulated underground water solution subjected to reaction, migration and conversion in the soil column reaction mechanism is collected by the solution collecting mechanism to be detected, so that the research of indoor experimental scale on the migration and conversion characteristics of the pollutant in the underground water is realized under the condition of changing key control conditions (namely the flow speed of the underground water), and a powerful basis is provided for the implementation of site-scale pilot test and repair engineering.
The embodiment that refines, earth pillar reaction mechanism includes earth pillar support 4 and is used for the organic glass post 5 of splendid attire simulation soil medium, and 5 fixed mounting on earth pillar support 4 of organic glass post, the lower extreme of organic glass post 5 is passed through feed pipe 2 and is connected with the play liquid end of speed governing peristaltic pump 3, and the upper portion of organic glass post 5 is passed through feed pipe 2 and is connected with solution collection mechanism. Specifically, the height of the organic glass column 5 is 20cm, the inner diameter is 8cm, and the column body is marked with scales so as to be convenient for uniformly filling a simulated soil medium; the liquid supply pipe 2 can adopt a silicone tube with the inner diameter of 1.6-4.8 mm. In order to avoid the washing of the simulated soil medium by water flow, gravel buffer layers are arranged above and below the simulated soil medium in the organic glass column 5, and the simulated soil medium and the gravel buffer layers are separated by nylon nets; in order to prevent the gravel buffer layer from being washed away in the water inlet process, a layer of nylon net is further laid on the top and the bottom of the organic glass column 5.
In the embodiment, the speed-regulating peristaltic pump 3 can be a BT600-2J precision peristaltic pump, the rotating speed can be manually regulated, the speed can be automatically controlled through an external control interface, the speed-regulating peristaltic pump has a power-off memory function, the rotating speed range is 0.1-600 rpm, the forward and reverse rotation is reversible, the rotating speed resolution is 0.1rpm, and the flow range of 0.07-2220 (mL/min) can be provided. In order to improve the automation degree of the simulation device, specifically, the solution collecting mechanism comprises an automatic part collector 7 and a solution collecting bottle 6 which is arranged on the automatic part collector 7 and is provided with scales, the automatic part collector 7 can be of a BSZ-40 common type, 40 solution collecting bottles with the maximum capacity of 50ml are arranged on each automatic part collector 7, the timing collecting range is 1 second-24 hours, and the solution collecting mechanism can be selected freely and has a power-off data storage function.
The use method of the groundwater pollutant reaction migration simulation device comprises the following specific steps:
(1) and filling a simulated soil medium in the soil column reaction mechanism.
Specifically, the soil column (i.e. the organic glass column 5) is filled by a dry method, so that the soil column is dry and clean and has no other impurities, a nylon net with 100 meshes is laid on a bottom clapboard, coordinate paper (parallel to a generatrix of the soil column) is pasted on the outer wall of the soil column, and the dimension is marked so as to be filled uniformly; then, small gravels with the thickness of 1.5cm, good roundness grinding degree and the grain diameter of 1-2 cm are filled as gravel buffer layers, so that the simulated soil medium layer is prevented from being washed by water flow, and a 100-mesh nylon net is lined; then, a 20cm soil sample (namely a simulated soil medium) is filled by adopting a layered equal-mass filling method (according to the volume weight of undisturbed soil), and each layer is 1cm, and the filling is carried out by 20 layers; and (3) paving a 100-mesh nylon net on the loaded simulated soil medium layer, continuously loading small gravel with the thickness of 1.5cm, good roundness grinding and particle size of 1-2 mm as a gravel buffer layer, lining the gravel buffer layer with a 100-mesh nylon net to prevent gravel of the gravel buffer layer from passing through grid holes of a top plate of the earth pillar in the water inlet process, and finally placing the top plate on the gravel buffer layer and embedding the top plate in the earth pillar.
Of course, for the experiment effect under the condition that different porous media need to be simulated, the particle size or lithology of the simulated soil media filled in the soil column can be changed.
(2) Connecting the filled soil column reaction mechanism with a speed-regulating peristaltic pump 3, filling 1L of simulated underground aqueous solution into a liquid supply container 1, wherein the simulated underground aqueous solution can be selectively replaced according to simulated different underground water environments, setting the initial rotating speed of the speed-regulating peristaltic pump 3 to be 3rpm, and simultaneously closing a liquid supply pipe 2 connected to the liquid outlet side of the soil column reaction mechanism by a water stop clamp; and starting the speed-regulating peristaltic pump 3 to saturate water, ensuring that a simulated soil medium in the earth column reaction mechanism is in a water-saturated state, and marking the end of water saturation when water is stably discharged from a liquid outlet of the earth column reaction mechanism for a period of time.
(3) And after the saturated water is finished, communicating a liquid outlet of the earth pillar reaction mechanism with the solution collection mechanism, maintaining the initial rotating speed of the speed-regulating peristaltic pump 3, taking a group of samples from the solution collection mechanism, and analyzing, testing and simulating indexes in the underground water solution to be used as the initial solution concentration of the earth pillar.
(4) Changing the rotating speed of the adjusting peristaltic pump 3, adjusting the rotating speed of the adjusting peristaltic pump 3 to 1rpm, setting the timing collection time of an automatic part collector 7 in the solution collection mechanism by combining the flow corresponding to the rotating speed, automatically collecting 1 sample every 30 minutes, continuously leaching simulated soil media in the earth pillar reaction mechanism by using simulated underground water solution containing target pollutants, sampling by the solution collection mechanism, immediately testing the water chemistry indexes such as pH, conductivity, oxidation-reduction potential, target pollutant concentration and the like, and stopping continuously leaching 2PV (2 pore volume number). For the simulation experiments of different flow rates, only the rotating speed of the peristaltic pump 3 needs to be changed, for example, the rotating speed of the peristaltic pump is adjusted to be 2rpm and 3rpm, and other operations are consistent with the operation of adjusting the rotating speed of the peristaltic pump to be 1 rpm. According to the water chemical index characteristics obtained by the simulation device at different flow rates, the reaction migration characteristics of the pollutants in the underground water at different flow rates are researched.
In conclusion, the reaction and migration simulation device for the underground water pollutants provided by the invention can realize the reaction and migration simulation effect of the pollutants under various underground water flow velocity conditions by changing and adjusting the rotating speed of the peristaltic pump, and one group of devices can obtain a plurality of groups of simulation results under control conditions, so that the control effect of the flow velocity on the reaction and migration characteristics of the pollutants in the underground water is researched according to the difference of water chemical parameters obtained by the devices under different flow velocity conditions, and a basis is provided for implementing the flow velocity control of leaching when target pollutants in the underground water are repaired.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (7)
1. The utility model provides an underground water pollutant reaction migration analogue means which characterized in that: the soil-soil simulation device comprises a liquid supply container, a speed-regulating peristaltic pump, a soil column reaction mechanism and a solution collecting mechanism which are sequentially connected through a liquid supply pipe, wherein a simulated underground aqueous solution is contained in the liquid supply container, a liquid inlet is formed in the bottom of the soil column reaction mechanism, a liquid outlet is formed in the top of the soil column reaction mechanism, and a simulated soil medium is filled in the soil column reaction mechanism.
2. The simulated reaction migration apparatus of underground water pollutant according to claim 1, characterized in that: the soil column reaction mechanism comprises a soil column support and an organic glass column used for containing simulated soil media, the organic glass column is fixedly mounted on the soil column support, the lower end of the organic glass column is connected with the liquid outlet end of the speed-regulating peristaltic pump through a liquid supply pipe, and the upper portion of the organic glass column is connected with the solution collecting mechanism through the liquid supply pipe.
3. A simulated device for underground water pollutant reaction and migration according to claim 2, wherein: the upper part and the lower part of the simulated soil medium in the organic glass column are both provided with gravel buffer layers, and the simulated soil medium and the gravel buffer layers are separated by nylon nets.
4. A simulated device for underground water pollutant reaction and migration according to claim 2, wherein: and a layer of nylon net is laid on the top and the bottom of the organic glass column.
5. The simulated reaction migration apparatus of underground water pollutant according to claim 1, characterized in that: the solution collection mechanism includes an autosegregation collector, and a graduated solution collection vial disposed on the autosegregation collector.
6. The use method of the underground water pollutant reaction and migration simulation device according to any one of claims 1 to 5, characterized by comprising the following steps:
1) filling a simulated soil medium in the soil column reaction mechanism;
2) connecting the filled soil column reaction mechanism with a speed-regulating peristaltic pump, filling simulated underground aqueous solution into a liquid supply container, setting the initial rotating speed of the speed-regulating peristaltic pump, closing a liquid supply pipe connected with the liquid outlet side of the soil column reaction mechanism, starting the speed-regulating peristaltic pump to saturate, and ensuring that simulated soil media in the soil column reaction mechanism are in a saturated state;
3) after water saturation is finished, a liquid outlet of the earth pillar reaction mechanism is communicated with the solution collection mechanism, the initial rotating speed of the speed-regulating peristaltic pump is kept, a group of samples are taken from the solution collection mechanism, and indexes in the simulated underground water solution are analyzed and tested to serve as the initial solution concentration of the earth pillar;
4) changing and adjusting the rotating speed of the peristaltic pump, setting the timing collection time of the solution collection mechanism by combining the flow corresponding to the rotating speed, continuously leaching the simulated soil medium in the soil column reaction mechanism by using the simulated underground water solution containing the target pollutant, sampling by the solution collection mechanism, and immediately testing the water chemistry indexes such as pH, conductivity, oxidation-reduction potential, target pollutant concentration and the like.
7. The use method of the groundwater contaminant reaction migration simulation device according to claim 6, wherein the soil column reaction mechanism in the step 1) is filled by a dry method, and the specific process is as follows: firstly, paving a 100-mesh nylon net at the bottom of an organic glass column, filling 1.5cm thick gravel with the particle size of 1-2 cm as a gravel buffer layer, and lining the 100-mesh nylon net; and then filling 20cm simulated soil media by adopting a layered equal-mass filling method, wherein each layer is 1cm, the simulated soil media are arranged in 20 layers, a nylon net with 100 meshes is paved on the filled simulated soil media, small gravels with the thickness of 1.5cm and the particle size of 1-2 mm are continuously filled to serve as a gravel buffer layer, a layer of nylon net with 100 meshes is lined, and finally the top plate is placed on the gravel buffer layer and embedded in the organic glass column.
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| CN111665180A (en) * | 2020-06-03 | 2020-09-15 | 中国地质大学（武汉） | Experimental system and method for slowly leaching aquifer rock samples of bedrock in multiple batches |
| CN114112799A (en) * | 2021-12-01 | 2022-03-01 | 暨南大学 | Device and method for simulating micro plastic solution migration under different conditions |
| CN115060810A (en) * | 2022-04-28 | 2022-09-16 | 南开大学 | Method for determining colloid release in soil of polluted site |
| CN115096760A (en) * | 2022-06-15 | 2022-09-23 | 河海大学 | Self-cleaning pollutant migration and conversion experimental device and method |
| CN115201448A (en) * | 2022-05-30 | 2022-10-18 | 南开大学 | Method and device for analyzing release and migration characteristics of polybrominated diphenyl ethers in polluted site |
| CN115951032A (en) * | 2022-10-17 | 2023-04-11 | 中国矿业大学(北京) | Groundwater leaching simulation device and method |
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- 2020-01-02 CN CN202010000608.XA patent/CN110927021A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111665180A (en) * | 2020-06-03 | 2020-09-15 | 中国地质大学（武汉） | Experimental system and method for slowly leaching aquifer rock samples of bedrock in multiple batches |
| CN114112799A (en) * | 2021-12-01 | 2022-03-01 | 暨南大学 | Device and method for simulating micro plastic solution migration under different conditions |
| CN115060810A (en) * | 2022-04-28 | 2022-09-16 | 南开大学 | Method for determining colloid release in soil of polluted site |
| CN115060810B (en) * | 2022-04-28 | 2024-03-26 | 南开大学 | Method for determining colloid release in contaminated site soil |
| CN115201448A (en) * | 2022-05-30 | 2022-10-18 | 南开大学 | Method and device for analyzing release and migration characteristics of polybrominated diphenyl ethers in polluted site |
| CN115201448B (en) * | 2022-05-30 | 2023-01-31 | 南开大学 | Method and device for analyzing release and migration characteristics of polybrominated diphenyl ethers in polluted site |
| CN115096760A (en) * | 2022-06-15 | 2022-09-23 | 河海大学 | Self-cleaning pollutant migration and conversion experimental device and method |
| CN115951032A (en) * | 2022-10-17 | 2023-04-11 | 中国矿业大学(北京) | Groundwater leaching simulation device and method |
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