CN114062417A - Sewage subsurface infiltration device for simulating freeze-thaw cycle and using method thereof - Google Patents
Sewage subsurface infiltration device for simulating freeze-thaw cycle and using method thereof Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 81
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 64
- 229910052802 copper Inorganic materials 0.000 claims abstract description 64
- 239000010949 copper Substances 0.000 claims abstract description 64
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 238000002347 injection Methods 0.000 claims abstract description 9
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- 238000010257 thawing Methods 0.000 claims description 12
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- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 230000002572 peristaltic effect Effects 0.000 claims description 6
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/14—Investigating or analyzing materials by the use of thermal means by using distillation, extraction, sublimation, condensation, freezing, or crystallisation
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Abstract
A sewage subsurface infiltration device for simulating freeze-thaw cycle and a use method thereof belong to the technical field of sewage treatment. But simulation freeze-thaw cycle's sewage subsurface infiltration device, including the SWIS earth pillar, refrigeration cycle system, water injection system and online soil parameter detection system, refrigeration cycle system includes from supreme a plurality of layers of refrigeration copper pipe that set gradually down on SWIS earth pillar upper portion for carry out top soil layering freeze-thaw temperature regulation and control, water injection system is including setting up in the cross water distributor at SWIS earth pillar middle part, the water injection of cross water distributor in to the SWIS earth pillar, be used for simulating domestic sewage, online soil parameter detection system include from follow supreme set up in the inside a plurality of soil parameter tachymeter of SWIS earth pillar, be used for gathering soil parameter in real time. The sewage subsurface infiltration device for simulating the freeze-thaw cycle and the use method thereof can realize the regulation and control of the SWIS layered freeze-thaw temperature, and further realize the accurate revealing of the influence of the surface soil freeze-thaw cycle on the SWIS sewage treatment performance.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a sewage subsurface infiltration device for simulating freeze-thaw cycle and a using method thereof.
Background
The underground sewage percolation System (SWIS) is one kind of land sewage treating technology with no power or micro power, stable treating effect and simple management, and has the work principle that sewage passes through specially prepared matrix layer under the combined action of gravity and capillary force and pollutant is purified under the combined action of biodegradation, physiochemical adsorption and physical interception. At present, SWIS is widely applied to different latitudes of the world and is an important mode process for sewage regeneration and reclamation in cold regions. The matrix layer is in continuous aerobic, anoxic and anaerobic states along the longitudinal direction, which is an important structural characteristic of SWIS, and because the upper soil freeze-thaw cycle disturbs the oxidation-reduction microenvironment of the bed body, the nutritional composition and the biological metabolic process of the matrix are further changed to a certain extent, so that the SWIS treatment performance is inevitably influenced deeply by the matrix layer.
However, in the existing indoor freeze-thaw test of SWIS, generally, the whole soil column needs to be placed in a refrigerator or an artificial climate box, the freeze-thaw alternation of the whole soil layer is realized through temperature control, the extreme temperature difference is large, the temperature change rate is high, and the actual natural environment in which the freeze-thaw alternation occurs only in the upper layer is difficult to simulate, so that a small amount of research conclusions about the evolution characteristics of the SWIS such as microbial activity, quantity, community structure change and the like in the freeze-thaw environment are greatly different from the actual results. Therefore, designing an experimental device capable of simulating the freeze-thaw characteristics of an actual soil layer and an operation method becomes an urgent problem to be solved in the SWIS research field.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a sewage subsurface infiltration device for simulating freeze-thaw cycles and a use method thereof, which can realize the regulation and control of SWIS layered freeze-thaw temperatures, carry out long-term stable parameter monitoring and further accurately reveal the influence of surface soil freeze-thaw cycles on SWIS sewage treatment performance.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a sewage subsurface infiltration device capable of simulating freeze-thaw cycle comprises a SWIS soil column, a refrigeration cycle system, a water injection system and an online soil parameter detection system;
the refrigeration circulating system comprises a plurality of layers of refrigeration copper pipes which are sequentially arranged on the upper part of the SWIS soil column from bottom to top and used for regulating and controlling the layered freezing and thawing temperature of surface soil;
the water injection system comprises a cross-shaped water distribution pipe arranged in the middle of the SWIS soil column, and the cross-shaped water distribution pipe injects water into the SWIS soil column and is used for simulating domestic sewage;
the online soil parameter detection system comprises a plurality of soil parameter tacheometers which are uniformly arranged in the SWIS soil column from bottom to top and used for collecting soil parameters in real time.
Further, the SWIS soil column comprises a stainless steel column with an opening at the top and test soil arranged inside the stainless steel column, wherein the test soil comprises pebbles, fine sand and a mixed matrix which are sequentially arranged from bottom to top.
Further, the mixed matrix is formed by mixing sand, slag and farmland soil according to the volume ratio of 2:5: 13; the porosity of the mixed matrix was 0.55 and the permeability coefficient was 5.0X 10-3～4.5×10-2cm·s-1。
Furthermore, the inlet end of the refrigeration copper pipe is connected with the gas outlet of the refrigeration compressor, the outlet end of the refrigeration copper pipe is connected with the gas return end of the refrigeration compressor through a gas transfer pump, and the temperature of the multiple layers of refrigeration copper pipes is adjusted through the refrigeration compressor.
Furthermore, the refrigeration copper pipe is of a snake-shaped coil pipe type structure and is arranged close to the inner wall of the stainless steel column, so that the temperature is guaranteed to be uniformly adjusted, and the heights of the multiple layers of refrigeration copper pipes along the axial direction of the SWIS soil column are 30-50 cm.
Furthermore, the water inlet end of the cross-shaped water distribution pipe is connected with the water tank through a peristaltic pump, and the cross-shaped water distribution pipe is wrapped by a nylon net; a watertight vessel is arranged below the cross-shaped water distribution pipe, and pebbles are filled between the cross-shaped water distribution pipe and the watertight vessel.
Furthermore, the soil parameter tachymeters are all connected with a computer, the soil parameter tachymeters send collected soil parameters to the computer for display and storage, and the soil parameters comprise the water content, the temperature, the conductivity, the nitrogen content, the phosphorus content, the potassium content and the pH value of the soil.
Further, the SWIS earth pillar is from supreme a plurality of soil sample collection sleeve pipe of evenly being provided with down for gather the soil sample after the freeze thawing, soil sample collection sleeve pipe is including being provided with the straight tube in gathering the hole and can dismantle the handle that sets up in the straight tube both ends.
Furthermore, a water outlet pipe is arranged at the bottom of the SWIS soil column and used for discharging water flowing downwards in the SWIS soil column.
A method for using a sewage subsurface infiltration device for simulating freeze-thaw cycles comprises the following steps:
s1, filling pebbles, fine sand and a mixed matrix into the stainless steel column from bottom to top in sequence;
s2, injecting water into the mixed matrix in a dry-wet alternating mode through a cross-shaped water distribution pipe;
and S3, introducing gas with a set temperature into each refrigeration copper pipe through a refrigeration compressor, simultaneously collecting soil parameters in real time through a soil parameter tachymeter, and sending the soil parameters to a computer for display and storage.
The invention has the beneficial effects that:
(1) the SWIS soil column and the refrigeration cycle system work cooperatively to jointly complete the simulation of the actual operating environment of the SWIS soil column under the freeze-thaw condition, so that reliable experimental data and technical support are provided for engineering design;
(2) the invention can efficiently complete the sewage treatment performance test of different freezing time, different freezing temperature, different melting temperature and different freezing and thawing times;
(3) the invention can simulate different freezing and thawing temperatures of different depths of soil, and realizes more accurate simulation of actual freezing and thawing circulation;
(4) according to the invention, the refrigeration cycle system is utilized to carry out layered freezing treatment on the surface soil, only one-time landfill is needed, the manpower and material resources consumption and the damage to the original state and structure of the soil caused by multiple landfills are avoided, and the real-time transmission of soil parameter data is realized by matching with the online soil parameter detection system, so that the use is convenient.
Additional features and advantages of the invention will be set forth in part in the detailed description which follows.
Drawings
Fig. 1 is a schematic structural diagram of an underground sewage percolation device capable of simulating freeze-thaw cycles according to an embodiment of the present invention;
FIG. 2 is a schematic top view of a SWIS soil column provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a soil sample collection sleeve according to an embodiment of the present invention.
Reference numerals in the drawings of the specification include:
1-water tank, 2-peristaltic pump, 3-refrigeration compressor, 4-test soil, 5-flange, 6-soil sample collection sleeve, 7-gas conveyor belt, 8-collection hole, 9-refrigeration copper pipe I, 10-refrigeration copper pipe II, 11-refrigeration copper pipe III, 12-SWIS soil column, 13-soil parameter tacheometer, 14-computer, 15-gas conveyor pump, 16-water outlet pipe, 17-straight pipe and 18-handle.
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.
In the description of the present invention, it is to be understood that the terms "lateral," "vertical," "upper," "lower," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "a," "an," "two," and "three" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
In order to solve the problems in the prior art, as shown in fig. 1 to 3, the invention provides a sewage subsurface infiltration device capable of simulating freeze-thaw cycle, which comprises a SWIS soil column 12, a refrigeration cycle system, a water injection system and an online soil parameter detection system;
the refrigeration circulating system comprises a plurality of layers of refrigeration copper pipes which are sequentially arranged on the upper part of the SWIS soil column 12 from bottom to top and used for regulating and controlling the layered freezing and thawing temperature of surface soil;
the water injection system comprises a cross-shaped water distribution pipe arranged in the middle of the SWIS soil column 12, and the cross-shaped water distribution pipe injects water into the SWIS soil column 12 and is used for simulating domestic sewage to be treated by a sewage underground infiltration system (SWIS);
the online soil parameter detection system comprises a plurality of soil parameter tacheometers 13 which are uniformly arranged inside the SWIS soil column 12 from bottom to top and used for collecting soil parameters in real time.
The SWIS soil column 12 comprises a stainless steel column with an open top and test soil 4 arranged inside the stainless steel column, wherein the test soil 4 comprises pebbles, fine sand and a mixed matrix which are sequentially arranged from bottom to top. In this embodiment, a freeze thawing test is realized by using a stainless steel column, pebbles 5cm high, fine sand 3cm high and a mixed matrix 140cm high are sequentially filled in the stainless steel column from bottom to top, the pebbles and the fine sand form a water collecting area for collecting water flowing downwards in the SWIS soil column 12, and in the test process, the water is discharged through a water outlet pipe 16 below the SWIS soil column 12. The mixed matrix is formed by mixing sand, slag and farmland soil according to the volume ratio of 2:5: 13; the porosity of the mixed matrix was 0.55 and the permeability coefficient was 5.0X 10-3～4.5×10-2cm·s-1。
The inlet end of the refrigeration copper pipe is connected with the gas outlet of the refrigeration compressor 3, the outlet end of the refrigeration copper pipe is connected with the gas return end of the refrigeration compressor 3 through a gas transfer pump 15, and the temperature of a plurality of layers of refrigeration copper pipes is adjusted through the refrigeration compressor 3. In the embodiment, the refrigeration copper pipe is provided with 3 layers from bottom to top, namely a refrigeration copper pipe III 11, a refrigeration copper pipe II 10 and a refrigeration copper pipe I9, the temperature of the gas in the refrigeration copper pipes of the 3 layers can be the same or different, for example, the temperature of the gas in the refrigeration copper pipe III 11 is 0 ℃ to-10 ℃, the temperature of the gas in the refrigeration copper pipe II 10 is-10 ℃ to-15 ℃, the temperature of the gas in the refrigeration copper pipe I9 is-15 ℃ to-20 ℃, the inlet end of the refrigeration copper pipe is communicated with the gas outlet of the refrigeration compressor 3 through a gas conveying belt 7, the temperature range of the refrigeration compressor 3 is-25 ℃ to 20 ℃, and the control precision is 0.5 ℃. The refrigeration copper pipe is of a snake-shaped coil pipe type structure and is arranged close to the inner wall of the stainless steel column, so that the temperature is guaranteed to be uniformly adjusted, and the height of the multiple layers of refrigeration copper pipes along the axial direction of the SWIS soil column 12 is 30-50 cm.
The water inlet end of the cross-shaped water distribution pipe is connected with the water tank 1 through the peristaltic pump 2, and the cross-shaped water distribution pipe is wrapped by a nylon net; a watertight dish is arranged below the cross-shaped water distribution pipe, pebbles are filled between the cross-shaped water distribution pipe and the watertight dish, specifically, the flow of the cross-shaped water distribution pipe is adjusted through a peristaltic pump 2, the cross-shaped water distribution pipe is arranged in a mixed matrix and sprays water on the watertight dish which is 5-10cm away from the lower part of the cross-shaped water distribution pipe, the watertight dish enables the water to uniformly overflow into the mixed matrix, the cross-shaped water distribution pipe is wrapped by a nylon net with 2 layers of mesh holes of 1.1mm x 1.1mm, and the pebbles with the diameter of 5-10mm are filled between the cross-shaped water distribution pipe and the watertight dish to avoid blockage.
The soil parameter tacheometers 13 are all connected with the computer 14, the soil parameter tacheometers 13 send collected soil parameters to the computer 14 to be displayed and stored, and the soil parameters comprise the water content, the temperature, the conductivity, the nitrogen content, the phosphorus content, the potassium content and the pH value of the soil.
The SWIS soil column 12 is uniformly provided with a plurality of soil sample collecting sleeves 6 from bottom to top for collecting freeze-thawed soil samples, each soil sample collecting sleeve 6 comprises a straight pipe 17 provided with a collecting hole 8 and handles 18 detachably arranged at two ends of the straight pipe 17, when the soil sample collecting device is used, the handle 18 at one end of the straight pipe 17 is screwed off, the straight pipe 17 is inserted into a sampling port, the handle 18 is screwed down, soil samples are collected through the collecting holes, and the straight pipe 17 penetrates through the SWIS soil column 12 along the radial direction of the SWIS soil column 12; when the soil sample is taken out, the handle 18 at one end of the straight pipe with holes 17 is unscrewed, the straight pipe with holes 17 is pulled out through the handle 18 at the other end of the straight pipe with holes 17, and the soil sample after freeze thawing is collected to provide a sample for subsequent other experimental analysis.
The bottom of the SWIS soil column 12 is provided with a water outlet pipe 16 for discharging water flowing downwards in the SWIS soil column 12, and during actual test, the water flowing out of the SWIS soil column 12 is collected through a collection box to provide samples for subsequent other experimental analysis.
In practical use, the stainless steel column can be divided into an upper part and a lower part which are connected through the flange 5, so that the collapse of soil when the stainless steel column is filled is prevented. The stainless steel column is 40-60 cm in diameter and 150-180 cm in height, and is externally coated with a heat-insulating foam or snowflake board material (3-5 cm in thickness). The SWIS soil column 12 is longitudinally provided with 4-6 groups of sampling ports with the diameter of 2-4 cm, the sampling ports are used for preventing air leakage and water leakage, and each group of sampling ports are symmetrically arranged on two sides of a stainless steel column and used for a soil sample collecting sleeve 6 to penetrate through. The SWIS soil column 12 is longitudinally provided with 4-6 groups of sockets for the insertion of a soil parameter tachymeter 13 to measure soil parameters, in the embodiment, 4 groups of sockets are longitudinally arranged along the SWIS soil column 12, 4 groups of sockets are provided with 4 sockets, and the 4 sockets are uniformly arranged along the circumferential direction of the SWIS soil column 12 and are used for collecting soil parameters. And a water inlet hole with the diameter of 0.5-1.0 cm is arranged 50-70 cm away from the top of the SWIS soil column 12 and is used for feeding water into the cross-shaped water distribution pipe. The bottom of the SWIS soil column 12 is provided with a support which plays a role of auxiliary support.
The invention also provides a use method of the sewage subsurface infiltration device for simulating freeze-thaw cycles, which comprises the following steps:
s1, filling pebbles, fine sand and a mixed matrix into the stainless steel column from bottom to top in sequence;
specifically, the stainless steel column is sequentially arranged from bottom to topFilling pebbles 5cm high, fine sand 3cm high and mixed matrix 140cm high; the mixed matrix is formed by mixing sand, slag and farmland soil according to the volume ratio of 2:5:13, the porosity is 0.55, and the permeability coefficient is 5.0 multiplied by 10-3～4.5×10-2cm·s-1；
S2, injecting water into the mixed matrix in a dry-wet alternating mode through a cross-shaped water distribution pipe;
specifically, water is injected into the mixed matrix for 12 hours through the water tank 1, the peristaltic pump 2 and the cross-shaped water distribution pipe, and then the mixed matrix is dried for 12 hours, so that water is injected circularly until the experiment is finished;
s3, introducing gas with a set temperature into each refrigeration copper pipe through the refrigeration compressor 3, simultaneously collecting soil parameters in real time through the soil parameter tachymeter 13, and sending the soil parameters to the computer 14 for display and storage.
Example one
A method of using an underground sewage percolation device simulating a freeze-thaw cycle, comprising the steps of:
s1, filling pebbles, fine sand and a mixed matrix into the stainless steel column from bottom to top in sequence;
specifically, pebbles 5cm high, fine sand 3cm high and a mixed matrix 140cm high are filled in a stainless steel column from bottom to top in sequence; the mixed matrix is formed by mixing sand, slag and farmland soil according to the volume ratio of 2:5:13, the porosity is 0.55, and the permeability coefficient is 5.0 multiplied by 10-3～4.5×10-2cm·s-1；
S2, injecting water into the mixed matrix in a dry-wet alternating mode through a cross-shaped water distribution pipe, wherein the hydraulic load is 0.04-0.12 m3/(m2·d)；
Specifically, water is injected into the mixed matrix for 12 hours through the water tank 1, the peristaltic pump 2 and the cross-shaped water distribution pipe, and then the mixed matrix is dried for 12 hours, so that water is injected circularly until the experiment is finished;
s3, introducing gas with a set temperature into each refrigeration copper pipe through the refrigeration compressor 3;
(1) adjusting the freezing temperature of 3 refrigeration copper pipes to be 0 ℃, and the freezing time is as follows: 12 h; adjusting the melting temperature of 3 refrigeration copper pipes to be 5 ℃, and adjusting the melting time to be as follows: completing a freeze-thaw cycle for 12 h;
(2) adjusting the freezing temperature of 3 refrigeration copper pipes to be-10 ℃, and the freezing time is as follows: 12 h; adjusting the melting temperature of 3 refrigeration copper pipes to be 5 ℃, and adjusting the melting time to be as follows: completing a freeze-thaw cycle for 12 h;
(3) adjusting the freezing temperature of 3 refrigeration copper pipes to be-20 ℃, and the freezing time is as follows: 12 h; adjusting the melting temperature of 3 refrigeration copper pipes to be 5 ℃, and adjusting the melting time to be as follows: and (5) completing a freeze-thaw cycle after 12 h.
In the 3 freezing and thawing cycle processes, soil parameters are collected in real time through the soil parameter tachymeter 13 and are sent to the computer 14 for display and storage, so that the influences of different freezing temperatures on the soil moisture content, the temperature, the conductivity, the nitrogen content, the phosphorus content, the potassium content and the pH value in the SWIS treated sewage can be analyzed. After each freeze-thaw cycle is received, the soil sample after freeze-thaw and the moisture flowing out of the SWIS soil column 12 can be collected, and samples are provided for subsequent other experimental analysis.
Example two
A method of using an underground sewage percolation device simulating a freeze-thaw cycle, comprising the steps of:
s1 and S2 are the same as in example one;
s3, introducing gas with a set temperature into each refrigeration copper pipe through the refrigeration compressor 3;
(1) adjusting the freezing temperature of 3 refrigeration copper pipes to be-10 ℃, and the freezing time is as follows: 24 h; adjusting the melting temperature of 3 refrigeration copper pipes to be 5 ℃, and adjusting the melting time to be as follows: completing a freeze-thaw cycle for 12 h;
(2) adjusting the freezing temperature of 3 refrigeration copper pipes to be-10 ℃, and the freezing time is as follows: 120 h; adjusting the melting temperature of 3 refrigeration copper pipes to be 5 ℃, and adjusting the melting time to be as follows: completing a freeze-thaw cycle for 12 h;
(3) adjusting the freezing temperature of 3 refrigeration copper pipes to be-10 ℃, and the freezing time is as follows: 240 h; adjusting the melting temperature of 3 refrigeration copper pipes to be 5 ℃, and adjusting the melting time to be as follows: completing a freeze-thaw cycle for 12 h;
(4) adjusting the freezing temperature of 3 refrigeration copper pipes to be-10 ℃, and the freezing time is as follows: 360 h; adjusting the melting temperature of 3 refrigeration copper pipes to be 5 ℃, and adjusting the melting time to be as follows: completing a freeze-thaw cycle for 12 h;
(5) adjusting the freezing temperature of 3 refrigeration copper pipes to be-10 ℃, and the freezing time is as follows: 480 h; adjusting the melting temperature of 3 refrigeration copper pipes to be 5 ℃, and adjusting the melting time to be as follows: and (5) completing a freeze-thaw cycle after 12 h.
In the 5 freezing and thawing circulation processes, soil parameters are collected in real time through the soil parameter tachymeter 13 and are sent to the computer 14 for display and storage, so that the influences of different freezing time on the soil moisture content, the temperature, the conductivity, the nitrogen content, the phosphorus content, the potassium content and the pH value in SWIS treated sewage can be analyzed. After each freeze-thaw cycle is received, the soil sample after freeze-thaw and the moisture flowing out of the SWIS soil column 12 can be collected, and samples are provided for subsequent other experimental analysis.
EXAMPLE III
A method of using an underground sewage percolation device simulating a freeze-thaw cycle, comprising the steps of:
s1 and S2 are the same as in example one;
s3, introducing gas with a set temperature into each refrigeration copper pipe through the refrigeration compressor 3;
(1) adjusting the freezing temperature of the refrigerating copper pipe III 11 to be 0 ℃, the freezing temperature of the refrigerating copper pipe II 10 to be-10 ℃, the freezing temperature of the refrigerating copper pipe I9 to be-15 ℃, and the freezing time to be as follows: 12 h; adjusting the melting temperature of 3 refrigeration copper pipes to be 5 ℃, and adjusting the melting time to be as follows: completing a freeze-thaw cycle for 12 h;
(2) adjusting the freezing temperature of the refrigerating copper pipe III 11 to be-5 ℃, the freezing temperature of the refrigerating copper pipe II 10 to be-12 ℃, the freezing temperature of the refrigerating copper pipe I9 to be-18 ℃, and the freezing time: 12 h; adjusting the melting temperature of 3 refrigeration copper pipes to be 5 ℃, and adjusting the melting time to be as follows: completing a freeze-thaw cycle for 12 h;
(3) adjusting the freezing temperature of the refrigerating copper pipe III 11 to be-10 ℃, the freezing temperature of the refrigerating copper pipe II 10 to be-15 ℃, the freezing temperature of the refrigerating copper pipe I9 to be-20 ℃, and the freezing time: 12 h; adjusting the melting temperature of 3 refrigeration copper pipes to be 5 ℃, and adjusting the melting time to be as follows: and (5) completing a freeze-thaw cycle after 12 h.
In the 3 freezing and thawing cycle processes, soil parameters are collected in real time through the soil parameter tachymeter 13 and are sent to the computer 14 for display and storage, and influences of surface soil layered freezing on soil moisture content, temperature, conductivity, nitrogen content, phosphorus content, potassium content and pH value in SWIS treatment sewage are analyzed. After each freeze-thaw cycle is received, the soil sample after freeze-thaw and the moisture flowing out of the SWIS soil column 12 can be collected, and samples are provided for subsequent other experimental analysis.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A sewage subsurface infiltration device capable of simulating freeze-thaw cycle is characterized by comprising a SWIS soil column, a refrigeration cycle system, a water injection system and an online soil parameter detection system;
the refrigeration circulating system comprises a plurality of layers of refrigeration copper pipes which are sequentially arranged on the upper part of the SWIS soil column from bottom to top and used for regulating and controlling the layered freezing and thawing temperature of surface soil;
the water injection system comprises a cross-shaped water distribution pipe arranged in the middle of the SWIS soil column, and the cross-shaped water distribution pipe injects water into the SWIS soil column and is used for simulating domestic sewage;
the online soil parameter detection system comprises a plurality of soil parameter tacheometers which are uniformly arranged in the SWIS soil column from bottom to top and used for collecting soil parameters in real time.
2. The device of claim 1, wherein the SWIS column comprises a stainless steel column with an open top and test soil disposed inside the stainless steel column, wherein the test soil comprises pebbles, fine sand and mixed matrix sequentially disposed from bottom to top.
3. An underground sewage percolation device able to simulate freeze-thaw cycles according to claim 2 and characterised in thatThe mixed matrix is formed by mixing sand, slag and farmland soil according to the volume ratio of 2:5: 13; the porosity of the mixed matrix was 0.55 and the permeability coefficient was 5.0X 10-3～4.5×10-2cm·s-1。
4. The underground sewage percolation device capable of simulating freeze-thaw cycles according to claim 1, wherein an inlet end of the refrigeration copper pipe is connected with an outlet end of a refrigeration compressor, an outlet end of the refrigeration copper pipe is connected with a return end of the refrigeration compressor through a gas transfer pump, and the temperature of the plurality of layers of refrigeration copper pipes is adjusted through the refrigeration compressor.
5. The device of claim 2, wherein the copper cooling tubes are coiled and closely attached to the inner wall of the stainless steel column.
6. The underground sewage percolation device capable of simulating freeze-thaw cycles according to claim 1, wherein the water inlet end of the cross-shaped water distributor is connected with a water tank through a peristaltic pump, and the outside of the cross-shaped water distributor is wrapped by a nylon net; a watertight vessel is arranged below the cross-shaped water distribution pipe, and pebbles are filled between the cross-shaped water distribution pipe and the watertight vessel.
7. The underground sewage percolation device capable of simulating freeze-thaw cycles according to claim 1, wherein the soil parameter tacheometers are connected with a computer, and send collected soil parameters to the computer for display and storage, wherein the soil parameters comprise water content, temperature, conductivity, nitrogen content, phosphorus content, potassium content and pH value of the soil.
8. The underground sewage infiltration device capable of simulating freeze-thaw cycles according to claim 1, wherein the SWIS soil column is provided with a plurality of soil sample collecting sleeves from bottom to top for collecting freeze-thawed soil samples, and the soil sample collecting sleeves comprise a straight pipe provided with collecting holes and handles detachably arranged at two ends of the straight pipe.
9. The underground sewage percolation device capable of simulating freeze-thaw cycles according to claim 1, wherein the bottom of the SWIS column is provided with a water outlet pipe for discharging water flowing downwards in the SWIS column.
10. A method of using an underground sewage percolation apparatus simulating a freeze-thaw cycle according to any one of claims 1 to 9, characterised in that it comprises the following steps:
s1, filling pebbles, fine sand and a mixed matrix into the stainless steel column from bottom to top in sequence;
s2, injecting water into the mixed matrix in a dry-wet alternating mode through a cross-shaped water distribution pipe;
and S3, introducing gas with a set temperature into each refrigeration copper pipe through a refrigeration compressor, simultaneously collecting soil parameters in real time through a soil parameter tachymeter, and sending the soil parameters to a computer for display and storage.
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