CN110672481A - Porous medium structure-based recharge permeation-promoting medium experimental method and model thereof - Google Patents
Porous medium structure-based recharge permeation-promoting medium experimental method and model thereof Download PDFInfo
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- CN110672481A CN110672481A CN201910962045.XA CN201910962045A CN110672481A CN 110672481 A CN110672481 A CN 110672481A CN 201910962045 A CN201910962045 A CN 201910962045A CN 110672481 A CN110672481 A CN 110672481A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/04—Investigating sedimentation of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means, e.g. by light scattering, diffraction, holography or imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
Abstract
The invention discloses a method for promoting infiltration by designing infiltration medium in a recharging process by adopting a layered heterogeneous structure. The porous medium structure is an important factor influencing physical blockage in the recharging process, and quartz sand with different grain diameters is adopted to realize a layered heterogeneous structure design to fill the recharging sand infiltration columns, wherein the difference is that the upper layer of one part of sand columns is filled with fine quartz sand, the lower layer is filled with coarse quartz sand, and the filling modes of the other part of sand columns are just opposite. The experimental comparison shows that: for the design of a porous medium structure with a fine upper part and a coarse lower part, the water flow migration direction is from the fine quartz sand to the coarse quartz sand, no obvious blockage occurs at the junction of two layers of sand, and suspended matters are mainly concentrated at an inlet to cause surface layer blockage. The invention can control the blockage by simple modes of scraping, back flushing and the like, has the advantages of simple design method, convenient and easy operation and low cost, and is mainly used for ensuring the infiltration efficiency of infiltration engineering.
Description
Technical Field
The invention belongs to the technical field of water recovery, and particularly relates to a recharge permeation-promoting medium experimental method based on a porous medium structure and a model thereof.
Background
Along with the increasingly serious shortage of water resources, the recharging engineering is used in large quantities and is used for accelerating urban rain flood, recharging reclaimed water and replenishing underground water and the like. The infiltration medium can have obvious blocking phenomenon after running for a period of time, and blocking substances are mainly concentrated in the medium, so that the permeability is obviously reduced, and even serious persons cause the failure of the infiltration function of the recharge engineering. The existing method for treating the blockage of the permeable pavement mainly utilizes modes of scraping, digging, back flushing and the like, but has poor effect on internal blockage types. Therefore, it is urgently needed to develop a novel and efficient blockage treatment method, effectively maintain the infiltration function of the recharge project, remarkably reduce the building waste and environmental impact caused by ineffective recharge projects and reconstruction by prolonging the service life, and achieve the aims of energy conservation and environmental protection.
Disclosure of Invention
The invention aims to solve the problems that the existing blocking substances are mainly concentrated in the medium, so that the permeability is obviously reduced, and even the permeation function of the recharging engineering is failed in serious cases.
The invention is realized in such a way that a recharge permeation-promoting medium experimental method based on a porous medium structure comprises the following steps:
(1) recharge permeation-promoting medium design
① analyzing the particle size of the medium by using a laser particle sizer and a screening method to analyze the particle size and select a representative sand sample;
② designing recharging medium;
③ wet loading, namely cleaning, drying and sterilizing the sand sample, loading the sand sample and pure water into a sand column in a layered manner, recording the total amount of the pure water injected in the sand loading process, and calculating the initial effective porosity according to the volume of water injection and the total volume of the sand column during sand loading;
(2) analysis of suspended matter blockage law in sand column
After the steps are completed, disassembling the sand column, sampling once every time when the sand column is disassembled to be 1-2cm high, drying to constant weight, washing by using high-purity deionized water until no suspended matters exist, drying again to constant weight, calculating the deposition amount and deposition rate of each layer of suspended matters, respectively drawing profile distribution curves of the deposition amount and deposition rate of the suspended matters, and analyzing the deposition rule of suspended matter particles in an infiltration medium.
Preferably, the representative sand sample is quartz sand comprising medium sand and coarse sand, wherein the diameter of the medium sand is more than 224 μm and less than 250 μm, and the diameter of the coarse sand is more than 631 μm and less than 700 μm.
Preferably, the recharge medium comprises an upper medium sand, and the lower coarse sand forms a layered heterogeneous structure.
Preferably, the recharge medium comprises upper coarse sand and lower medium sand forming a layered heterogeneous structure.
Preferably, in the wet sample loading, the step of loading the cleaned, dried and sterilized quartz sand and pure water into a sand column in a layered manner comprises: the known volume of pure water is poured into the sand column every time, a certain amount of quartz sand is poured into the sand column, the mixture is stirred by a medicine spoon and then naturally precipitated, and the process is repeated until the top of the sand column.
Preferably, after the analysis of the blockage law of the suspended matters in the sand column is finished, dredging is carried out: the surface layer deposited blockage is removed by scraping or back flushing is carried out by utilizing a high-pressure water pump or an air compressor, so that the blockage substances can be carried out from the surface layer permeation medium, and the permeability is recovered.
The invention also comprises a recharge permeation-promoting medium experimental model based on the porous medium structure, wherein the recharge permeation-promoting medium structure comprises a power supply, a computer, a data acquisition unit, an automatic sample sampler, a magnetic stirrer and a recharge permeation-promoting device, valves are arranged at the bottom and the top of the recharge permeation-promoting device, the valves are connected with the matched automatic sample sampler and the matched magnetic stirrer through pipelines, peristaltic pumps are arranged on the magnetic stirrer and the matched valve connecting pipelines, a pressure sensor is arranged on the recharge permeation-promoting device, pressure sensors are arranged on the automatic sample sampler and the matched valve connecting pipelines, the pressure sensors are connected with the data acquisition unit, the data acquisition unit is connected with the power supply, and the data acquisition unit is connected with the computer.
Preferably, the recharge permeation-promoting equipment is internally layered with quartz sand
Compared with the prior art, the invention has the beneficial effects that: the invention can effectively prevent the internal blockage of the medium, recover the permeability to a certain extent through the blockage of the scraping surface, can be repeatedly used, can keep the higher permeability to a certain extent so as to prolong the service life, and has the advantages of simple and rapid design method, convenient and easy operation and low cost.
Drawings
FIG. 1 is a schematic view of a device for designing a medium with a fine upper part and a coarse lower part according to the present invention;
FIG. 2 is a graph showing the distribution of plugs in the osmotic medium of suspended matter in water according to the present invention;
in the figure: 1. recharging infiltration-promoting equipment; 2. a pressure sensor; 3. a valve; 4. a sample automatic sampler; 5. a magnetic stirrer; 6. a peristaltic pump; 7. a computer; 8. a data acquisition unit; 9. a power source.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1-2, the present invention provides a method for testing a porous medium structure based on a recharge permeation-promoting medium, comprising the following steps:
(1) recharge permeation-promoting medium design
① analyzing the particle size of the medium by using a laser particle sizer and a screening method to analyze the particle size and select a representative sand sample;
② designing recharging medium;
③ wet loading, namely cleaning, drying and sterilizing the sand sample, loading the sand sample and pure water into a sand column in a layered manner, recording the total amount of the pure water injected in the sand loading process, and calculating the initial effective porosity according to the volume of water injection and the total volume of the sand column during sand loading;
(2) analysis of suspended matter blockage law in sand column
After the steps are completed, disassembling the sand column, sampling once every time when disassembling the sand column at a height of 1-2cm, drying to constant weight, washing with high-purity deionized water until no suspended matters exist, drying again to constant weight, calculating the deposition amount and deposition rate of each layer of suspended matters, respectively drawing profile distribution curves of the deposition amount and deposition rate of the suspended matters, and analyzing the deposition rule of suspended matter particles in an infiltration medium as shown in figure 2.
The laser particle analyzer is the existing equipment, and the screening method is the prior art and can be directly carried out by hundreds of degrees without excessive description. The deposition rate is the amount of deposition divided by the time of the recharge experiment.
The representative sand sample is quartz sand and comprises medium sand and coarse sand, wherein the diameter of the medium sand is more than 224 mu m and less than 250 mu m, and the diameter of the coarse sand is more than 631 mu m and less than 700 mu m.
In example 1: the recharge medium comprises upper medium sand, and the lower coarse sand forms a layered heterogeneous structure; example 2: the recharge medium comprises coarse sand at the upper part, and middle sand at the lower part forms a layered heterogeneous structure.
In the wet sample loading, the steps of cleaning, drying and sterilizing the quartz sand, and then loading the quartz sand and pure water into a sand column in a layered manner comprise: the known volume of pure water is poured into the sand column every time, a certain amount of quartz sand is poured into the sand column, the mixture is stirred by a medicine spoon and then naturally precipitated, and the process is repeated until the top of the sand column.
The purpose of this is to ensure that no impurities are introduced in the experiment, so as not to affect the experiment.
And (3) dredging after the blockage law analysis of the suspended matters in the sand column is completed: the surface layer deposited blockage is removed by scraping or back flushing is carried out by utilizing a high-pressure water pump or an air compressor, so that the blockage substances can be carried out from the surface layer permeation medium, and the permeability is recovered.
The experimental result of the invention is that the layered heterogeneous structure of the porous medium is an important factor influencing physical blockage in the recharging process, the earth columns are filled with quartz sand with different particle sizes, each earth-sand column is composed of two layers of quartz sand with different textures, the difference is that the upper layer of one part of the sand columns is filled with fine quartz sand, the lower layer is filled with coarse quartz sand, and the filling modes of the other part of the sand columns are just opposite. The experimental results show that: 1 for a sand column consisting of a two-layer texture structure, if the water flow passes through coarse quartz sand and then fine quartz sand, i.e. the migration direction of the water flow is from coarse ground quartz sand to fine texture quartz sand, then significant clogging of suspended matter occurs at the interface of the two layers of sand, whereas if the migration direction of the colloid is from fine texture quartz sand to coarse texture quartz sand, then no significant clogging occurs at the interface of the two layers of sand; 2 the suspended substance is mainly retained in the inlet section of the column, even if the boundary of two layers of quartz sand is obviously blocked, the amount of the suspended substance is less than that of the suspended substance blocked in the inlet section, because when the suspended substance just enters the inlet section of the sand column, preferential flow is not formed, the pores in the sand layer become potential pore channels of suspended substance particles regardless of the size, so that the small particles can be greatly blocked in the small pore channels, but along with the increase of the migration distance of the particles in the porous medium, two effects of volume exclusion and convection gradually tend to migrate from the pores with larger permeability and do not enter the pores with smaller permeability, so that the possibility that the small particles are blocked in the small pores is reduced, and the mass distribution of the suspended substance particles retained in the porous medium is in an over-exponential distribution; 3 small particles are remarkably retained at the interface of two layers of sandy soil because the laminar texture structure destroys the preferential migration mode of suspended particles to a certain extent, so that a part of small pores at the interface become available point sites for blocking the small particles, and the larger the texture difference of 4 two layers of quartz sandy soil is, the more the amount of colloid blocked at the interface is.
According to the conclusion, the adjustment can be made under specific working conditions, and if the working conditions are complex, the construction can be carried out after the experiment is carried out according to the experimental method.
The invention also comprises a recharge permeation-promoting medium experimental model based on a porous medium structure, wherein the recharge permeation-promoting medium structure comprises a power supply 9, a computer 7, a data acquisition unit 8, an automatic sample sampler 4, a magnetic stirrer 5 and a recharge permeation-promoting device 1, and valves 3 are arranged at the bottom and the top of the recharge permeation-promoting device 1 and used for controlling water feeding and discharging.
The valve 3 is connected with the matched automatic sample sampler 4 and the magnetic stirrer 5 through pipelines, the magnetic stirrer 5 is connected with the matched automatic sample sampler 3 through a peristaltic pump 6, and the peristaltic pump 6 is designed to ensure that water of the magnetic stirrer 5 can be sent into the recharge infiltration promoting equipment 1 at any time.
Be provided with pressure sensor 2 on the equipment of infiltrating soon of recharging, sample automatic sampler 4 and assorted all be provided with pressure sensor 2 on the 3 connecting tube of valve, pressure sensor 2 all with data collection station 8 is connected, can detect water injection volume and dress sand volume at any time through pressure sensor 2 to with detected signal at any time through data collection station 8 conveying computer 7 and carry out analysis and show.
The data collector 8 is connected with the power supply 9, and the data collector 8 is connected with the computer 7.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A recharge permeation-promoting medium experiment method based on a porous medium structure is characterized by comprising the following steps:
(1) recharge permeation-promoting medium design
① analyzing the particle size of the medium by using a laser particle sizer and a screening method to analyze the particle size and select a representative sand sample;
② designing recharging medium;
③ wet loading, namely cleaning, drying and sterilizing the sand sample, loading the sand sample and pure water into a sand column in a layered manner, recording the total amount of the pure water injected in the sand loading process, and calculating the initial effective porosity according to the volume of water injection and the total volume of the sand column during sand loading;
(2) analysis of suspended matter blockage law in sand column
After the steps are completed, disassembling the sand column, sampling once every time when the sand column is disassembled to be 1-2cm high, drying to constant weight, washing by using high-purity deionized water until no suspended matters exist, drying again to constant weight, calculating the deposition amount and deposition rate of each layer of suspended matters, respectively drawing profile distribution curves of the deposition amount and deposition rate of the suspended matters, and analyzing the deposition rule of suspended matter particles in an infiltration medium.
2. The experimental method of claim 1 for the recharge permeation-promoting medium based on the porous medium structure, which is characterized in that: the representative sand sample is quartz sand and comprises medium sand and coarse sand, wherein the diameter of the medium sand is more than 224 mu m and less than 250 mu m, and the diameter of the coarse sand is more than 631 mu m and less than 700 mu m.
3. The experimental method of claim 2 for the recharge permeation-promoting medium based on the porous medium structure, which is characterized in that: the recharge medium comprises upper medium sand, and lower coarse sand forms a layered heterogeneous structure.
4. The experimental method of claim 2 for the recharge permeation-promoting medium based on the porous medium structure, which is characterized in that: the recharge medium comprises coarse sand at the upper part, and medium sand at the lower part forms a layered heterogeneous structure.
5. The experimental method of claim 2 for the recharge permeation-promoting medium based on the porous medium structure, which is characterized in that: in the wet sample loading, the steps of cleaning, drying and sterilizing the quartz sand, and then loading the quartz sand and pure water into a sand column in a layered manner comprise: the known volume of pure water is poured into the sand column every time, a certain amount of quartz sand is poured into the sand column, the mixture is stirred by a medicine spoon and then naturally precipitated, and the process is repeated until the top of the sand column.
6. The method for testing the recharge infiltration-promoting medium based on the porous medium structure according to claim 5, which is characterized in that: and (3) dredging after the blockage law analysis of the suspended matters in the sand column is completed: the surface layer deposited blockage is removed by scraping or back flushing is carried out by utilizing a high-pressure water pump or an air compressor, so that the blockage substances can be carried out from the surface layer permeation medium, and the permeability of the surface layer permeation medium is recovered.
7. A recharge permeation-promoting medium experimental model based on a porous medium structure is characterized in that: including power, computer, data collection station, sample automatic sampler, magnetic stirrers, recharge and promote equipment that oozes, recharge and promote the bottom and the top of equipment that oozes all is provided with the valve, valve and assorted sample automatic sampler and magnetic stirrers pass through the pipe connection, magnetic stirrers and assorted be provided with the peristaltic pump on the valve connecting tube, recharge and promote to ooze and be provided with a plurality of pressure sensor on the equipment, sample automatic sampler and assorted all be provided with pressure sensor on the valve connecting tube, pressure sensor all with data collection station connects, data collection station with the power is connected, data collection station with the computer is connected.
8. The experimental model of claim 7, which is based on porous medium structure and is characterized in that: the inside of the recharge permeation-promoting equipment is layered with quartz sand.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113203844A (en) * | 2021-04-13 | 2021-08-03 | 合肥工业大学 | Water source heat pump recharging process chemical blockage verification test device |
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