CN115504623A - Device for treating volatile D-NAPL (D-NAPL) by using filler to reinforce underground water circulating well and application - Google Patents
Device for treating volatile D-NAPL (D-NAPL) by using filler to reinforce underground water circulating well and application Download PDFInfo
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- CN115504623A CN115504623A CN202211006255.XA CN202211006255A CN115504623A CN 115504623 A CN115504623 A CN 115504623A CN 202211006255 A CN202211006255 A CN 202211006255A CN 115504623 A CN115504623 A CN 115504623A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
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- C—CHEMISTRY; METALLURGY
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Abstract
The invention discloses a device for treating volatile D-NAPL (D-NAPL) of a filler reinforced underground water circulating well and application thereof, wherein the device comprises an air inlet pipeline, an air outlet pipeline, an inner well pipe and an outer well pipe which are sequentially arranged from inside to outside, and a region between the inner well pipe and the outer well pipe is sequentially provided with a first open pore section, a blocking section and a second open pore section which are not communicated with each other from top to bottom; the inner well pipe and the outer well pipe corresponding to the first opening section area are provided with first sieve holes, and the inner well pipe and the outer well pipe corresponding to the second opening section area are provided with second sieve holes; the bottom of the inner well pipe is provided with a packing area, one end of the air inlet pipeline extends into the packing area, and one end of the air outlet pipeline extends into the space, located above the underground water level, of the outer well pipe. The device provided by the invention can synchronously improve the treatment efficiency of the D-NAPL pollutants while ensuring the bubble dispersion effect, and effectively enhances the treatment effect of the underground water circulating well on treating the volatile D-NAPL pollutants.
Description
Technical Field
The invention belongs to the technical field of groundwater remediation, and particularly relates to a device for treating volatile D-NAPL (D-NAPL) by using a filler reinforced groundwater circulating well and application of the device.
Background
Various new technologies and methods are developed to deal with different types of soil and groundwater pollutants. Among groundwater chemical contaminants, non-aqueous phase liquid (NAPL) organics are a common and difficult to treat contaminant; among them, NAPL lighter than water is called L-NAPL, and NAPL heavier than water is called D-NAPL. At present, the D-NAPL pollutant repairing and treating technology is still relatively lagged behind, the soil and underground water integral ex-situ repairing or underground water pumping-repairing technology is mainly used at present, and the prior art is large in construction amount and poor in economical efficiency and is not suitable for in-situ repairing of polluted sites.
The proposal of the underground water circulating well technology provides a new idea for treating the underground water volatile D-NAPL pollutants. Patents CN 202210517935.1, CN 202210512717.9, CN 202111299209.9 and the like provide a technical method for repairing or coupling strengthening repair of underground water circulation wells aiming at different characteristic pollutants, and play a good role in promoting the development and improvement of the technology for repairing the underground water circulation wells. However, when the conventional underground water circulating well technology is applied to a polluted site with a thick diving layer, the underground water gas-lifting effect is poor, the hydraulic circulating effect is relatively poor and the pollutant removing effect is not ideal due to the fact that the liquid layer is thick and the stroke of the underground water containing air bubbles is long.
Therefore, a proper strengthening means is found to improve the removal efficiency of the D-NAPL pollutant by the underground water circulating well technology, and the method has positive promoting significance for the development of the in-situ remediation technology of the underground water polluted site.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a device for treating volatile D-NAPL by using a filler reinforced underground water circulating well and application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a device for treating volatile D-NAPL (D-NAPL) of a filler reinforced underground water circulating well, which comprises an air inlet pipeline, an air outlet pipeline, an inner well pipe and an outer well pipe which are arranged in sequence from inside to outside, and is characterized in that a first open pore section, a blocking section and a second open pore section which are not communicated with each other are sequentially arranged in a region between the inner well pipe and the outer well pipe from top to bottom;
the inner well pipe and the outer well pipe corresponding to the first opening section area are provided with first sieve pores, and the inner well pipe and the outer well pipe corresponding to the second opening section area are provided with second sieve pores;
the bottom of the inner well pipe is provided with a filler area, one end of the air inlet pipeline extends into the filler area, and one end of the air outlet pipeline extends into a space, located above the underground water level, of the outer well pipe.
In a preferred embodiment of the present invention, the height of the inner well pipe is higher than the groundwater level and lower than the height of the outer well pipe.
As a preferable technical scheme of the invention, the first open pore section and the second open pore section are filled with quartz sand.
As the preferable technical scheme of the invention, the blocking section is filled with bentonite.
As a preferable technical scheme of the invention, the main body of the filler area is an inverted frustum-shaped stainless steel sintering net, and the sintering net is filled with fillers.
As the preferable technical scheme of the invention, the filler is selected from one or more of activated carbon, molecular sieve, tourmaline, calcium peroxide, calcium persulfate, zero-valent iron and microorganism; preferably, the filler is selected from one or more of activated carbon, molecular sieve, calcium peroxide, and calcium persulfate.
As the preferable technical scheme of the invention, the inverted circular truncated cone type stainless steel sintering net is fixedly installed or detachably installed.
As a preferable technical scheme of the invention, the diameter of the top of the inverted circular truncated cone stainless steel sintering net is 30-80 mm, the diameter of the bottom of the inverted circular truncated cone stainless steel sintering net is 30-100 mm, and the height of the inverted circular truncated cone stainless steel sintering net is 40-100 mm.
In a second aspect, the present invention provides the use of the apparatus described above in D-NAPL processing.
Preferably, the application comprises the following steps:
s1, paving sandy soil in a groundwater simulation test field;
s2, filling filler into the filler area, and then laying the device in the underground water simulation test field in the step S1;
s3, filling water level to a preset height, then filling D-NAPL into the water body, standing, and measuring the concentration of the D-NAPL in the water body;
s4, injecting air into the water body, and measuring the concentration of the D-NAPL again after treating for a period of time.
Compared with the prior art, the invention has the following beneficial effects:
the device provided by the invention takes a conventional underground water circulating well as a main body structure, a filler area is creatively arranged at the underground section of the underground water circulating well, the main body of the filler area is an inverted table type stainless steel sintering net, and the reinforcing filler is arranged in the sintering net and fixed at the water inlet position of an air inlet pipeline. When the device is operated, gas is injected from an air inlet pipeline, is dispersed by the filler and then is mixed with liquid at the bottom of the well pipe, so that the apparent density of the underground water in the area is reduced and the underground water floats upwards; meanwhile, the D-NAPL contaminants form a gas-liquid distribution in the bubbles, so that part of the contaminants rise with the bubbles. When bubbles rise to a filler bed layer, part of pollutants can be removed by different types of fillers through modes of physical adsorption, chemical oxidation, biological decomposition and the like, the problem that the gas lift efficiency of a conventional underground water circulating well device is insufficient when a site with larger thickness of a submerged layer is faced is effectively solved, the treatment efficiency of D-NAPL pollutants can be synchronously improved while the bubble dispersion effect is ensured, and the treatment effect of treating volatile D-NAPL pollutants by an underground water circulating well is effectively enhanced.
Drawings
FIG. 1 is a schematic view of the structure of the apparatus of the present invention.
Wherein, 1, an inner well pipe; 2. an outer well pipe; 3. a first open hole section; 31. a first screen hole; 4. a blocking section; 5. a second open section; 51. a second sieve pore; 6. a filler zone; 7. a water barrier layer; 8. an air inlet duct; 9. a gas outlet conduit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 obtained by a person skilled in the art without making any creative effort based on the embodiments of the present invention, belong to the protection scope of the present invention.
Meanwhile, it is emphasized that those whose specific conditions are not specified in the examples are carried out according to the conventional conditions or the conditions suggested by the manufacturers. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Referring to fig. 1, the present invention provides a device for treating volatile D-NAPL in a filler reinforced groundwater circulation well, including an air inlet pipe 8, an air outlet pipe 9, and an inner well pipe 1 and an outer well pipe 2 which are sequentially arranged from inside to outside, wherein a region between the inner well pipe 1 and the outer well pipe 2 is, from top to bottom, a first open-pore section 3, a barrier section 4, and a second open-pore section 5 which are not communicated with each other;
the inner well pipe 1 and the outer well pipe 2 corresponding to the first open-hole section 3 are provided with first sieve holes 31, and the inner well pipe 1 and the outer well pipe 2 corresponding to the second open-hole section 5 are provided with second sieve holes 51;
the bottom of the inner well pipe 1 is provided with a packing area 6, one end of an air inlet pipeline 8 extends into the packing area 6, and one end of an air outlet pipeline 9 extends into a space, above the ground water level, of the outer well pipe 2.
In the above technical solution, it can be understood that the inner well pipe 1 and the outer well pipe 2 constitute a main body structure of the circulation well; meanwhile, a first open hole section 3, a blocking section 4 and a second open hole section 5 are formed in the area between the inner well pipe 1 and the outer well pipe 2 from top to bottom, so that the circulation and circulation of underground water bodies are facilitated; one end of the air inlet pipeline 8 extends into the filling area 6, and the other end is communicated with an air supply system (not shown in the figure); one end of the air outlet pipeline 9 extends into the outer well pipe 2, and the other end is communicated with an external processing system, so that gas can be conveniently flowed in and discharged out. It is also emphasized that in actual groundwater treatment, it is usually the water barriers 7 that are in contact with the bottommost part of the circulation well, and groundwater of different vertical depths are not in communication with each other due to the presence of the water barriers 7.
In some embodiments, the packing region 6 is located inside the inner wellbore tubular 1 corresponding to the second open-hole section 5.
In some embodiments, further referring to fig. 1, the height of the inner well pipe 1 is above the ground water level and below the height of the outer well pipe 2; meanwhile, it can be understood that the inner well pipe 1 must be located above the ground water level and below the ground, while the outer well pipe 2 must be above the ground; thus, in the part above the ground water level, there will inevitably be a space only of the outer tubular 2, into which the end of the air outlet conduit 9 extends. According to the arrangement, on one hand, a gas discharge space is formed at the part of the outer well pipe 2, which is higher than the inner well pipe 1, and after a gas outlet pipeline is connected, gas discharge is realized; on the other hand, the height of the inner well pipe 1 is higher than the underground water level, so that the underground water containing bubbles can rise along the inside of the inner well pipe 1 after being treated by the filler in the filler area 6, and the gas can be effectively discharged conveniently. In fact, the relative position of the packing region 6 and the gas outlet pipe 9 extending into the outer well pipe 2 and the size specification of the packing bed layer can be determined by pressure calculation so as not to affect the hydraulic circulation effect of the underground water circulation well. It is understood that the conventional technical means known to those skilled in the art, and the specific height value is not specifically limited in the present invention.
In some embodiments, the first and second open pore sections 3 and 5 are filled with quartz sand; and bentonite is filled in the blocking section 4.
In some embodiments, the filler zone 6 body is an inverted truncated stainless steel sintered mesh that is filled with filler. It can be understood that the stainless steel sintered mesh can be obtained through market, is a common raw material, and the specification of the stainless steel sintered mesh can be obtained according to pressure calculation so as not to influence the hydraulic circulation effect of the underground water circulation well. Preferably, the inverted circular truncated cone stainless steel sintered mesh has a top diameter of 30-80 mm, a bottom diameter of 30-100 mm, and a height of 40-100 mm (upside down, i.e. wide at the top and narrow at the bottom when actually installed). It should be particularly emphasized that the pore size of the stainless steel sintered mesh is only required to be realized to enclose the filler and prevent the filler from leaking out, and the specific pore size is not limited in the present invention.
In some embodiments, the filler is selected from one or more of activated carbon, molecular sieve, tourmaline, calcium peroxide, calcium persulfate, zero-valent iron, and microorganism. It can be understood that different types of fillers have different adsorption principles and different adsorption capacities, and common filler materials such as physical adsorption, chemical oxidation, biological decomposition and the like can be used as fillers to be applied to the device; preferably, the filler is selected from one or more of activated carbon, molecular sieve, calcium peroxide, and calcium persulfate; more preferably, the filler can be a blend type or a load type, for example, an active carbon or molecular sieve filler loaded with calcium peroxide or calcium persulfate can be used.
In some embodiments, the inverted circular truncated cone stainless steel sintering net is installed in a fixed mode or a detachable mode, and the installation mode is flexible; particularly, for the place that pollutes seriously, the detachable installation mode of preferred selection, this advantage is favorable to follow-up maintenance, change, and the operation is easier. It is understood that the specific installation form of the inverted circular truncated cone type stainless steel sintered mesh is a conventional technical means for those skilled in the art, and is easily implemented depending on the inner well pipe 1, and the specific installation structure or form thereof is not particularly limited in the present invention, so that those skilled in the art can implement it.
Based on the technical scheme, the invention has the following action principle: the filler area is fixed by an inverted circular table type stainless steel sintering net, and the reinforcing filler is arranged in the sintering net and is arranged at the water inlet position of the air inlet pipeline; when the system operates, air is compressed and then injected into the bottom of the well through the air inlet pipeline 8, and the injected air is dispersed through the filling area 6 to generate air lift effect on underground water at the bottom of the well; the volatile D-NAPL pollutants of the underground water generate gas-liquid distribution in bubbles and rise together with the underground water containing the bubbles; the bubbles rise to the packing area, are primarily treated by packing in the packing area, and untreated parts can continue to rise along with the bubble-containing underground water, are finally discharged from a negative pressure outlet of the gas outlet pipeline, and are connected into a tail gas treatment device to be treated until the bubbles reach the standard and are discharged.
With further reference to fig. 1, the present invention also provides a method for D-NAPL contaminant treatment using the above apparatus, comprising the steps of:
s1, paving sandy soil in a groundwater simulation test field;
s2, filling filler into the filler area 6, and then laying the device in the underground water simulation test field in the step S1;
s3, filling water level to a preset height, then filling D-NAPL into the water body, standing, and measuring the concentration of the D-NAPL in the water body;
s4, injecting air into the water body, and measuring the concentration of the D-NAPL again after treating for a period of time.
In the above technical solution, it can be understood that the preset height of the water level can be set according to actual needs.
The apparatus, method and use of the present invention for treating volatile D-NAPL in a filler enhanced groundwater circulation well are further described with reference to the following examples.
Example 1
A device for treating volatile D-NAPL (D-NAPL) of a filler reinforced underground water circulating well comprises an inner well pipe 1 and an outer well pipe 2 which are sequentially arranged from inside to outside, wherein a first open pore section 3, a blocking section 4 and a second open pore section 5 which are not communicated with each other are sequentially arranged in a region between the inner well pipe 1 and the outer well pipe 2 from top to bottom;
the corresponding inner well pipe 1 and the corresponding outer well pipe 2 in the first open hole section 3 are respectively provided with a first sieve pore 31, and the corresponding inner well pipe 1 and the corresponding outer well pipe 2 in the second open hole section 5 are respectively provided with a second sieve pore 51;
the bottom of the inner well pipe 1 is fixedly provided with a packing area 6, and one end of an air inlet pipeline 8 extends into the packing area 6.
In this embodiment, the height of the inner tubular 1 is higher than the ground water level and lower than the height of the outer tubular 2.
In this embodiment, the first perforated section 3 and the second perforated section 5 are filled with quartz sand.
In this embodiment, the barrier section 4 is filled with bentonite.
In this embodiment, the main body of the filler region 6 is an inverted frustum-shaped stainless steel sintered mesh, and the sintered mesh is filled with a filler.
In this embodiment, a gas outlet pipe 9 is further inserted into the top of the outer casing pipe 2, and the insertion height of the gas outlet pipe 9 is higher than the ground water level.
In this embodiment, a water barrier layer 7 is further laid on the bottom of the inner well pipe 1 and the outer well pipe 2.
Application example 1
In a groundwater simulation test field of 1.6m multiplied by 0.8m multiplied by 1.2m, a clay layer of about 0.2m is paved at the bottom, sandy soil of about 0.9m is paved at the middle layer, surface soil of about 0.1m is paved at the upper layer, the total water level is added to the position of 1m of the groundwater simulation test field, and a circulating well device is arranged at a pre-selected point according to the embodiment 1. The filler is a calcium sulfate-loaded molecular sieve (Y-type molecular sieve is selected, calcium sulfate is loaded by an impregnation method, and the loading amount is 10 wt.%), the diameter of the bottom of the inverted-truncated-cone-shaped stainless steel sintering net is 50mm, the diameter of the top of the inverted-truncated-cone-shaped stainless steel sintering net is 40mm, the height of the inverted-truncated-cone-shaped stainless steel sintering net is 80mm, and the total filler mass is 80g.
Injecting 1, 2-dichloropropane at a preselected point with the injection depth of 1m, measuring the concentration of the 1, 2-dichloropropane in the water body at the position of 1m to be 762ug/L, and after placing for 3 days, measuring the concentration of the 1, 2-dichloropropane in the water body at the position of 1m to be 703ug/L. The test is started, air is injected, and the air injection amount is controlled to be 0.96m 3 H is the ratio of the total weight of the catalyst to the total weight of the catalyst. After 48h, the concentration of the pollutants in the water is detected from the monitoring well to be 466ug/L. By comparison, under the same operation condition, the concentration of the pollutants after the treatment is 653ug/L when no filler exists. The scheme improves the pollutant removal rate of the strengthening treatment system by 26.6%.
Application example 2
In a groundwater simulation test field with the size of 1.6m multiplied by 0.8m multiplied by 1.2m, a clay layer with the size of about 0.2m is paved at the bottom, sandy soil with the size of about 0.9m is paved at the middle layer, surface soil with the size of about 0.1m is paved at the upper layer, the total water level is added to the position with the height of 1m of the groundwater simulation test device, and a circulating well device is arranged at a pre-selection point according to the embodiment 1. The filler is selected from activated carbon loaded with zero-valent iron (the loading amount is 10wt.% by an impregnation method), the diameter of the bottom of the inverted frustum-shaped stainless steel sintering net is 50mm, the diameter of the top of the inverted frustum-shaped stainless steel sintering net is 40mm, the height of the inverted frustum-shaped stainless steel sintering net is 80mm, and the total filler mass is 35g.
Injecting 1, 2-dichloroethane into the preselected point, with the injection depth of 1m, measuring the concentration of 826ug/L of 1, 2-dichloroethane in the water body at 1m, and after standing for 3 days, measuring the concentration of 773ug/L of 1, 2-dichloroethane in the water body at 1 m. The test is started, air is injected, and the air injection amount is controlled to be 0.96m 3 H is used as the reference value. After 24h, the concentration of the pollutants in the water is detected to be 613ug/L from the monitoring well. By comparison, under the same operation condition, the concentration of the pollutants after treatment is 720ug/L when no filler exists. The scheme improves the pollutant removal rate of the strengthening treatment system by 13.8%.
Application example 3
In a groundwater simulation test field with the size of 1.6m multiplied by 0.8m multiplied by 1.2m, a clay layer with the size of about 0.2m is paved at the bottom, sandy soil with the size of about 0.9m is paved at the middle layer, surface soil with the size of about 0.1m is paved at the upper layer, the total water level is added to the position with the height of 1m of the groundwater simulation test device, and a circulating well device is arranged at a pre-selection point according to the embodiment 1. The filler is selected to be activated carbon loaded with calcium peroxide (the calcium peroxide is loaded by an impregnation method, the loading capacity is 10 wt.%), the diameter of the bottom of the inverted-truncated-cone-shaped stainless steel sintering net is 80mm, the diameter of the top of the inverted-truncated-cone-shaped stainless steel sintering net is 60mm, the height of the inverted-truncated-cone-shaped stainless steel sintering net is 50mm, and the total filler is 60g.
Injecting 1, 2-dichloroethylene into a preselected point, measuring the concentration of 1, 2-dichloroethylene in the water body at 1m by 608ug/L after the injection depth is 1m, and measuring the concentration of 1, 2-dichloroethylene in the water body at 1m by 572ug/L after the water body is placed for 3 days. The test is started, air is injected, and the air injection amount is controlled to be 0.48m 3 H is the ratio of the total weight of the catalyst to the total weight of the catalyst. After 72h, the concentration of the pollutants in the water is detected to be 417ug/L from the monitoring well. By comparison, under the same operation condition, the concentration of the pollutants after treatment is 545ug/L when no filler exists. The scheme improves the pollutant removal rate of the strengthening treatment system by 22.4 percent.
Application example 4
In a groundwater simulation test field of 1.6m multiplied by 0.8m multiplied by 1.2m, a clay layer of about 0.2m is paved at the bottom, sandy soil of about 0.9m is paved at the middle layer, surface soil of about 0.1m is paved at the upper layer, the total water level is added to the position 1m of the height of the groundwater simulation test device, and a circulating well device is arranged at a pre-selected point according to the embodiment 1. The filler is selected from activated carbon loaded with microorganisms (microorganisms capable of degrading DNAPL are selected and bacteria liquid is mixed with the activated carbon according to the volume ratio of 1.
Injecting 1, 2-trichloroethane into a preselected point, measuring the concentration of 1, 2-trichloroethane in the water body at 1m by 1m injection depth of 1m, and measuring the concentration of 1, 2-trichloroethane in the water body at 1m by 727ug/L after standing for 3 days. The test is started, air is injected, and the air injection amount is controlled to be 0.48m 3 H is used as the reference value. After 72h, the concentration of the pollutants in the water is detected from the monitoring well to be 573ug/L. By comparison, under the same operation condition, the concentration of the pollutants after the treatment is 687ug/L when no filler exists. The scheme improves the pollutant removal rate of the strengthening treatment system by 15.7 percent.
Application example 5
In a groundwater simulation test field with the size of 1.6m multiplied by 0.8m multiplied by 1.2m, a clay layer with the size of about 0.2m is paved at the bottom, sandy soil with the size of about 0.9m is paved at the middle layer, surface soil with the size of about 0.1m is paved at the upper layer, the total water level is added to the position with the height of 1m of the groundwater simulation test device, and a circulating well device is arranged at a pre-selection point according to the embodiment 1. The method comprises the following steps of selecting an active carbon and tourmaline mixed filler (the mass ratio of the active carbon to the tourmaline is 1.
Injecting 1, 2-dichloroethylene into a preselected point position with the injection depth of 1m, measuring the concentration of the 1, 2-dichloroethylene in the water body at the position of 1m by 830ug/L, and after standing for 3 days, measuring the concentration of the 1, 2-dichloroethylene in the water body at the position of 1m by 798ug/L. The test is started, air is injected, and the air injection amount is controlled to be 0.96m 3 H is used as the reference value. After 48h, the concentration of the pollutants in the water is detected from the monitoring well to be 622ug/L. By comparison, under the same operation condition, the concentration of the pollutants after treatment without the filler is 749ug/L. The scheme improves the pollutant removal rate of the strengthening treatment system by 15.9 percent.
The technical idea of the present invention is illustrated by the above embodiments, but the present invention is not limited to the above embodiments, that is, it does not mean that the present invention must depend on the above embodiments to be implemented. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of individual materials of the product of the present invention, and the addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. A device for treating volatile D-NAPL (D-NAPL) of a filler reinforced underground water circulating well comprises an air inlet pipeline (8), an air outlet pipeline (9), an inner well pipe (1) and an outer well pipe (2) which are sequentially arranged from inside to outside, and is characterized in that a first open pore section (3), a blocking section (4) and a second open pore section (5) which are not communicated with each other are sequentially arranged in a region between the inner well pipe (1) and the outer well pipe (2) from top to bottom;
the inner well pipe (1) and the outer well pipe (2) corresponding to the first open hole section (3) are respectively provided with a first sieve pore (31), and the inner well pipe (1) and the outer well pipe (2) corresponding to the second open hole section (5) are respectively provided with a second sieve pore (51);
the bottom of interior well casing (1) is provided with filler district (6), the one end of air inlet pipeline (8) stretches into the inside in filler district (6), the one end of air outlet pipeline (9) stretches into outer well casing (2) and is located the space above the ground water level.
2. Device for the treatment of volatile D-NAPL in a filler reinforced groundwater circulation well according to claim 1, characterized in that the height of the inner well pipe (1) is higher than the groundwater level and lower than the height of the outer well pipe (2).
3. The apparatus for treating volatile D-NAPL of the filler reinforced groundwater circulation well, according to claim 1, wherein the first open hole section (3) and the second open hole section (5) are filled with quartz sand.
4. Device for treating volatile D-NAPL for a filler reinforced groundwater circulation well according to claim 1, characterized in that the barrier section (4) is filled with bentonite.
5. The apparatus for treating volatile D-NAPL through filler reinforced ground water circulation well, according to claim 1, characterized in that the body of the filler area (6) is an inverted truncated stainless steel sintered mesh, and the sintered mesh is filled with filler.
6. The device for treating the volatile D-NAPL by the filler reinforced underground water circulating well is characterized in that the filler is selected from one or more of activated carbon, molecular sieve, tourmaline, calcium peroxide, calcium superphosphate, zero-valent iron and microorganism; preferably, the filler is selected from one or more of activated carbon, molecular sieve, calcium peroxide, calcium persulfate.
7. The apparatus of claim 5 or 6, wherein the inverted truncated stainless steel sintered mesh is installed in a fixed or detachable manner.
8. The apparatus for treating volatile D-NAPL through the filler reinforced underground water circulating well according to claim 7, wherein the inverted frustum shaped stainless steel sintered mesh has a top diameter of 30-80 mm, a bottom diameter of 30-100 mm and a height of 40-100 mm.
9. Use of the apparatus of any one of claims 1 to 8 in D-NAPL processing.
10. Use according to claim 9, characterized in that it comprises the following steps:
s1, paving sandy soil in a groundwater simulation test field;
s2, filling filler in a filler area (6), and then arranging the device in any one of claims 1-8 in the underground water simulation test field in the step S1;
s3, filling the water level to a preset height, then filling D-NAPL into the water body, standing, and then measuring the concentration of the D-NAPL in the water body;
s4, injecting air into the water body, and measuring the concentration of the D-NAPL again after treating for a period of time.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211006255.XA CN115504623A (en) | 2022-08-22 | 2022-08-22 | Device for treating volatile D-NAPL (D-NAPL) by using filler to reinforce underground water circulating well and application |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211006255.XA CN115504623A (en) | 2022-08-22 | 2022-08-22 | Device for treating volatile D-NAPL (D-NAPL) by using filler to reinforce underground water circulating well and application |
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| CN115504623A true CN115504623A (en) | 2022-12-23 |
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| CN202211006255.XA Pending CN115504623A (en) | 2022-08-22 | 2022-08-22 | Device for treating volatile D-NAPL (D-NAPL) by using filler to reinforce underground water circulating well and application |
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| CN114560562A (en) * | 2022-04-18 | 2022-05-31 | 成都理工大学 | Bioreactor functional component in underground water circulation well and use method thereof |
| CN217025469U (en) * | 2021-09-26 | 2022-07-22 | 防灾科技学院 | Gallery type reaction chamber type underground water circulating well |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6007274A (en) * | 1997-05-19 | 1999-12-28 | Arcadis Geraghty & Miller | In-well air stripping, oxidation, and adsorption |
| US20040007524A1 (en) * | 2002-07-12 | 2004-01-15 | Scott Noland | Compositions for removing hydrocarbons and halogenated hydrocarbons from contaminated environments |
| CN211255613U (en) * | 2019-09-26 | 2020-08-14 | 湖南新九方科技有限公司 | Get rid of organic pollutant's normal position circulation well cluster repair system in groundwater |
| CN111484122A (en) * | 2020-04-22 | 2020-08-04 | 长沙工研院环保有限公司 | Underground water remediation system and method |
| CN111646577A (en) * | 2020-05-18 | 2020-09-11 | 中科鼎实环境工程有限公司 | Circulating well system for treating VOCs and DNAPLs in polluted underground water |
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