CN115893701A - Heavy metal pollutant combined treatment circulation well body structure and circulation well - Google Patents
Heavy metal pollutant combined treatment circulation well body structure and circulation well Download PDFInfo
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- CN115893701A CN115893701A CN202211149273.3A CN202211149273A CN115893701A CN 115893701 A CN115893701 A CN 115893701A CN 202211149273 A CN202211149273 A CN 202211149273A CN 115893701 A CN115893701 A CN 115893701A
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Abstract
The invention provides a circulating well body structure and a circulating well for composite treatment of heavy metal pollutants, which comprise an outer well pipe and an inner well pipe sleeved in the outer well pipe, wherein the bottoms of the outer well pipe and the inner well pipe are both sealed structures, an annular cavity is formed between the outer side wall of the inner well pipe and the outer well pipe, a partition plate is arranged in the annular cavity and divides the annular cavity into an annular upper cavity and an annular lower cavity which are not communicated with each other, a bottom cavity communicated with the annular lower cavity is formed between the bottom of the inner well pipe and the bottom of the outer well pipe, a permeation wall is arranged on the inner wall of the inner well pipe, the inner well pipe section corresponding to the permeation wall is a water filtering pipe, the inner well pipe is communicated with the annular upper cavity through a water pump, the outer well pipe section corresponding to the annular upper cavity is provided with a water filtering pipe section, and the outer well pipe section corresponding to the annular lower cavity is also provided with a water filtering pipe section. The method has small disturbance to the environment, and the processing efficiency is obviously improved; the problem of prior art excavation contaminated site area big, repair time is long, infiltration wall is difficult to clear up or change is solved.
Description
Technical Field
The invention relates to the technical field of groundwater pollution remediation in the field of environmental protection, in particular to a circulating well body structure for composite treatment of heavy metal pollutants and a circulating well.
Background
In recent decades, social economy is continuously developed, the industrialization process is also accelerated, the extensive development of the industrialization process easily brings a lot of environmental pollution problems to the society, and especially, the unreasonable disposal of various pollutants, the improper discharge of urban wastewater, the abuse of agricultural chemicals and the like easily cause serious pollution to underground water and soil, influence the life health of people, are not beneficial to the sustainable development of the society, and become environmental problems concerned by the nation and the society.
At present, aiming at removing pollutants in underground water and soil, the domestic commonly used restoration technology mainly comprises an extraction treatment technology, an underground water aeration technology, a permeable reactive barrier technology, a physical restoration technology, a chemical restoration technology and a biological restoration technology. Various remediation techniques have been adapted for pollutant remediation, but have limitations.
Chinese patent document CN212102323U discloses a device for repairing groundwater by using coated nano zero-valent iron, which comprises a water well system, an extraction system and an aeration system, wherein the water well system comprises a well chamber and a well body, and the well body sequentially comprises a quartz sand layer, a mesh grid layer, an aquifer, a mesh grid layer, a permeable reaction layer and a mesh grid layer from outside to inside; the permeable reactive layer consists of a porous medium and coated nano zero-valent iron particles uniformly distributed in the porous medium. The utility model discloses a combine permeable reactive barrier technique and circulating well technique, extract through criss-cross atmospheric quantity and carry out the processing pressure disturbance to well water with the burden, the malleation that the atmospheric quantity aeration produced, though make the effective area of the groundwater of handling increase, but groundwater does not flow, and the pollutant is difficult to get into in the well, and it is limited to influence the radius, and permeable barrier does not set up according to the pollutant distribution in addition, causes the wasting of resources.
Chinese patent document CN104692531A discloses an underground water heavy metal pollution remediation device, mainly including: a water pumping system, a water distribution system, an adsorption reaction area, a phytoremediation area, a rapid seepage area and a monitoring system. The adsorption reaction zone is filled with a medium filler which has an adsorption effect on heavy metals so as to achieve the effect of removing the heavy metals in the underground water. Super accumulator plants with the functions of absorbing and enriching heavy metals are planted in the plant restoring area, so that the effect of removing the heavy metals is enhanced. The technical method organically combines physical, chemical and plant adsorption technologies, and can repair the pollution of various heavy metals such As As, zn, cd, mn, cu, cr, pb and the like. However, the target aquifer treated by the method is limited in volume, soil bodies with a certain area need to be excavated, damage to the original ecology is caused, secondary pollution to soil is easily caused if the polluted underground water is not thoroughly treated in a reaction mode, and the treatment device is greatly influenced by seasons and can only be constructed in the seasons with good plant growth.
Chinese patent document CN100998987A discloses an electric remediation method for contaminated soil and underground water, the method is characterized in that positive and negative electrodes are arranged at two ends of an area of the contaminated soil and the underground water, the positive and negative electrodes are arranged at two ends of the area of the contaminated soil and the underground water, and the distance between the electrodes in the contaminated soil and the underground water is 30-60cm; and adding conductive buffer solution at a certain distance between the negative electrode and the soil and underground water to form a conductive region with a conductive length of 10-30cm, controlling the pH region of the electrode region, and maintaining the low pH condition of the soil and the underground water, wherein the electric field gradient is 1-5V/cm. The anode electrode is a silver electrode, an aluminum plate electrode or an iron rod electrode. The invention selects proper electrode material, shape and area size, controls the electric potential of the electric field, and adopts active metal as the anode to efficiently repair the polluted soil and underground water. Although the invention provides an electric repairing method, the repairing area is limited, the repairing cost is high, and the chemical properties of underground water and soil can be changed.
Disclosure of Invention
Based on the above, the invention aims to provide a well body structure of a heavy metal pollutant composite treatment circulating well, which has small environmental disturbance in the effective treatment process of underground water and remarkably improves the treatment efficiency. In order to realize the purpose, the technical scheme of the invention is as follows:
a well body structure of a circulating well for composite treatment of heavy metal pollutants comprises an outer well pipe and an inner well pipe sleeved in the outer well pipe, wherein the bottoms of the outer well pipe and the inner well pipe are both sealing structures, an annular cavity is formed between the outer side wall of the inner well pipe and the outer well pipe, and a partition plate is arranged in the annular cavity and divides the annular cavity into an annular upper cavity and an annular lower cavity which are not communicated with each other;
the annular water filter is characterized in that a bottom cavity communicated with the annular lower cavity is formed between the bottom of the inner well pipe and the bottom of the outer well pipe, a permeable wall is arranged on the inner wall of the inner well pipe, an inner well pipe section corresponding to the permeable wall is a water filter pipe, the inner well pipe is communicated with the annular upper cavity through a water pump, an outer well pipe section corresponding to the annular upper cavity is provided with a water filter pipe section, and an outer well pipe section corresponding to the annular lower cavity is also provided with a water filter pipe section.
Further, heavy metal pollutant combined treatment circulating well body structure still include the desilting device, the desilting device includes sewage extraction device and desilting pipe, the one end intercommunication of desilting pipe the bottom cavity, the other end intercommunication of desilting pipe sewage extraction device.
Furthermore, a permeable wall support is arranged in the inner well pipe, an outward tray is arranged on the periphery of the bottom end of the permeable wall support and used for placing a permeable wall, the width of the tray is 300-850mm, the distance between the tray and the lower end part of the inner well pipe is 30-50mm, the section of the inner well pipe corresponding to the permeable wall is a water filter pipe, and the height of the permeable wall and the height of the water filter pipe are 1500-2500mm, which can be determined according to the distribution of pollution plume; the infiltration wall support still has the deflector, the deflector has the breach, the inside wall of interior well casing be provided with be used for with breach matched with sand grip, the sand grip with deflector sliding connection makes the infiltration wall support can along the inner wall of interior well casing reciprocates. The guide plate is arranged, so that the permeable wall can be conveniently installed or replaced.
Further, the well body structure of the heavy metal pollutant combined treatment circulating well further comprises a permeable wall cover plate arranged in the inner well pipe, and the permeable wall cover plate is covered on the permeable wall.
Further, the cross sections of the outer well pipe and the inner well pipe are in a runway shape, or the cross sections of the outer well pipe and the inner well pipe are in a rectangular shape.
Furthermore, the outer well pipe and the inner well pipe are made of stainless steel, the wall thickness of the outer well pipe is 6-13mm, the wall thickness of the inner well pipe is 3-6mm, and the outer well pipe and the inner well pipe are formed by welding;
the distance between the bottom of the outer well pipe and the bottom of the inner well pipe is 900-1100mm, and the annular width of the annular cavity is 100-300mm.
Further, the outer well pipe comprises a settling pipe, a lower water filtering pipe, a solid pipe, an upper water filtering pipe and a solid pipe from bottom to top; the length of the lower filter pipe is 1500-2500mm, the length of the upper filter pipe is 800-1500mm, and the upper filter pipe and the lower filter pipe are filter pipes adopting a trapezoidal cutting seam structure, or the upper filter pipe and the lower filter pipe are filter pipes adopting a wire winding structure;
the upper filter pipe and the lower filter pipe can adopt a trapezoidal slotted structure, namely trapezoidal gaps are processed on a steel plate and then welded into a well pipe structure, and the width of the gaps is determined according to the thickness of aquifer particles; the upper water filtering pipe and the lower water filtering pipe can also adopt a wire winding structure, namely a well pipe structure is formed by welding wire windings and vertical wires, and gaps among the wire windings are determined according to the size of particles of the aquifer.
Furthermore, the material of the permeable wall is one or more of active carbon, zero-valent iron, bentonite, zeolite, synthetic ion exchange resin and limestone.
According to another aspect of the invention, a circulating well for composite treatment of heavy metal pollutants is provided, which comprises a main circulating well and an auxiliary circulating well, wherein a well body structure of the circulating well for composite treatment of heavy metal pollutants is arranged in the main circulating well;
a plurality of circulating well auxiliary wells are arranged on one side of the circulating well main well, electrodes are arranged in any two circulating well auxiliary wells, negative electrodes are arranged in the circulating well auxiliary wells close to the circulating well main well, positive electrodes are arranged in the circulating well auxiliary wells far away from the circulating well main well, the negative electrodes are connected with the cathode of a direct-current power supply, and the positive electrodes are connected with the anode of the direct-current power supply;
or,
a plurality of circulating well auxiliary wells are arranged on one side of the circulating well main well, electrodes are arranged in any two circulating well auxiliary wells, negative electrodes are arranged in the circulating well auxiliary wells close to the circulating well main well, positive electrodes are arranged in the circulating well auxiliary wells far away from the circulating well main well, the negative electrodes are connected with the cathode of a direct-current power supply, and the positive electrodes are connected with the anode of the direct-current power supply;
the other side of the main well of the circulating well is also provided with a plurality of auxiliary wells of the circulating well, electrodes are arranged in any two auxiliary wells of the circulating well, a negative electrode is arranged in the auxiliary well of the circulating well close to the main well of the circulating well, a positive electrode is arranged in the auxiliary well of the circulating well far away from the main well of the circulating well, the negative electrode is connected with the cathode of the direct-current power supply, and the positive electrode is connected with the anode of the direct-current power supply.
Furthermore, the top end of the annular upper cavity is 400-600mm higher than the ground, the cross section of the main well of the circulating well is in a runway shape or a rectangle shape, the well depth of the main well of the circulating well is 5-20m, the well width is 1000-2000mm, and the well length is 5-10m. The structural dimensions of a particular well may depend on the width and depth of the groundwater contamination plume.
The invention has the beneficial effects that:
the well body structure of the circulating well for the composite treatment of the heavy metal pollutants and the circulating well have small disturbance to the environment in the effective treatment process of underground water, and the treatment efficiency is obviously improved; the problem of dig among the prior art polluted site area big, repair time is long, infiltration wall is difficult to be cleared up or change is solved.
The invention has the following advantages:
1. the pumping and injection water is kept balanced, and the overlarge disturbance to the stratum is prevented;
2. the permeable wall is arranged in the well, so that the excavation area of soil is reduced, pollutants are brought into the permeable wall more by circulation of underground water for treatment, and pollution plume bypass flow is prevented;
3. the underground water enters the water storage ring after passing through the circulating well water filter pipe, part of sediment and particles can sink to the bottom of the water storage ring and cannot enter the permeable wall, so that the blocking probability of the permeable wall is reduced, and the service life of the permeable wall is prolonged;
4. heavy metals are guided to be separated from soil particles through the electric field device, enter underground water and flow into the circulating well, so that the repairing radius of the circulating well is enlarged, and the repairing efficiency is improved;
5. the permeable wall can be lifted out of the well and cleaned or replaced.
Drawings
FIG. 1 is a schematic diagram of a well body structure of a heavy metal pollutant combined treatment circulating well according to an embodiment of the invention;
FIG. 2 is a schematic diagram of the distribution of the main well and the auxiliary well of the circulation well according to an embodiment of the present invention;
description of reference numerals:
1 an outer well pipe; 2 an inner well pipe; 3, an annular upper cavity; 4, an annular lower cavity; 5, mounting a water filtering pipe section;
6, a water filtering pipe section; 7 permeating the wall cover plate; 8, a tray; 9 penetrating the wall; 10 a bottom cavity;
11 a water pump; 12 a water pipe; 13 a well cover; 14 a sewage extraction device; 15 dredging pipes; 16 direct current power supply;
17 a positive electrode; 18 a negative electrode; 19 circulating well auxiliary wells; 20, a polluted area; 21 a ground water line; 22, the ground; and 23, circulating the main well.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the well body structure of the heavy metal pollutant composite treatment circulation well and the circulation well of the present invention are further described in detail with reference to the accompanying drawings and examples. It should be noted that the features in the following embodiments and examples may be combined with each other without conflict. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Referring to fig. 1 and 2, a well body structure of a heavy metal pollutant composite treatment circulation well according to an embodiment of the present invention includes an outer well pipe 1 and an inner well pipe 2 sleeved in the outer well pipe 1.
The bottom of the outer well pipe 1 and the bottom of the inner well pipe 2 are both sealing structures, an annular cavity is formed between the outer side wall of the inner well pipe 2 and the outer well pipe 1, a partition plate is arranged in the annular cavity and divides the annular cavity into an annular upper cavity 3 and an annular lower cavity 4 which are not communicated with each other.
A bottom cavity 10 communicated with the annular lower cavity is formed between the bottom of the inner well pipe 2 and the bottom of the outer well pipe 1, and a permeation wall 9 is arranged on the inner wall of the inner well pipe 2. The inner well pipe section corresponding to the permeable wall 9 is a strainer, and the inner well pipe 2 is communicated with the annular upper cavity 3 through a water pump 11. The outer well pipe section corresponding to the annular upper cavity 3 is provided with a water filtering pipe section, and the outer well pipe section corresponding to the annular lower cavity 4 is also provided with a water filtering pipe section.
In fig. 1, the outer casing section corresponding to the annular upper chamber 3 has an upper water filtering pipe section 5, and the outer casing section corresponding to the annular lower chamber 4 has a lower water filtering pipe section 6.
The bottom of the outer well pipe 1 and the inner well pipe 2 can be sealed by a base or a plate body to form a sealing structure.
A water pipe 12 of the water pump 11 is communicated with the upper end of the annular upper cavity 3, and the water pump 11 can be a submersible pump to pump underground water purified in the well into the annular upper cavity 3 (an upper water storage ring). The submersible pump can be a high-lift water pump, and the submersible pump can be used for pressurizing when the annular upper cavity 3 (the upper water storage ring) is slowly filled with water, so that the underground water injection is accelerated.
As a preferable embodiment, the well body structure of the heavy metal pollutant composite treatment circulating well further comprises a dredging device. The dredging device comprises a sewage extraction device 14 and a dredging pipe 15, one end of the dredging pipe 15 is communicated with the bottom cavity 10, and the other end of the dredging pipe 15 is communicated with the sewage extraction device 14. The sewage extraction device 14 may be an air compressor or a water pump.
In a preferred embodiment, the outer tubular member 1 and the inner tubular member 2 are made of stainless steel, and the outer tubular member 1 has a wall thickness of 6 to 13mm and the inner tubular member 2 has a wall thickness of 3 to 6mm. Thus, the strength of the well body is ensured to be met, and the normal work of the circulating well is not influenced by the deformation of the well body structure. The distance between the bottom of the outer well pipe 1 and the bottom of the inner well pipe 2 is 900-1100mm, preferably 1000mm; the annular width of the annular cavity is 100-300mm.
The outer well pipe 1 and the inner well pipe 2 can be connected through a partition plate, the partition plate can be made of stainless steel and is connected with the outer well pipe 1 and the inner well pipe 2 through electric welding, the inner well pipe 2 can be provided with a base, and the partition plate divides a space formed by the inner well pipe and the outer well pipe to form an upper water storage ring and a lower water storage ring. Wherein, the annular upper cavity 3 is used as an upper water storage ring, and the annular lower cavity 4 is used as a lower water storage ring. The top of the outer and inner well pipes 1, 2 may be sealed with a well lid 13.
The upper and lower water storage rings are temporary water storage devices, and the width of the water storage rings is 100-300mm. The lower end of the upper water storage ring is provided with a water filter pipe, and the groundwater can be discharged into the stratum through the water filter pipe. The lower water storage ring is a transition water ring, and the underground water enters the lower water storage ring through the lower filter pipe and then enters the permeable wall 9.
The lower water storage ring allows large particles and generated sediment in the underground water to sink into the bottom cavity 10 (sedimentation tank), so that the large particles and the generated sediment are prevented from entering the permeable wall 9, and the blocking probability of the permeable wall is reduced.
The top end of the upper water storage ring can be 400-600mm, preferably 500mm, higher than the ground, and the purified underground water is pumped into the upper water storage ring and injected into the stratum through a filter pipe arranged on the upper water storage ring. The upper water storage ring forms a long and narrow ring structure, and the underground water in the upper water storage ring and the stratum corresponding to the upper water filtering pipe section easily form hydraulic gradient difference, so that the underground water is favorably injected into the stratum. Of course, in other embodiments, the top end of the upper water storage ring may be higher than the ground by more than 500mm, for example, the top end of the upper water storage ring is higher than the ground by at least 500mm.
Alternatively, the cross-sectional shape of both the outer tubular 1 and the inner tubular 2 may be racetrack shaped. Namely, the two ends are semicircular, and the middle is a rectangular structure. The cross-sectional shape of the outer casing pipe 1 and the inner casing pipe 2 may also be rectangular.
A permeable wall bracket is arranged in the inner well pipe 2. The periphery of the bottom end of the permeable wall bracket is provided with an outward tray 8, the tray 8 is used for placing a permeable wall 9, the width of the tray 8 is 300-850mm, and the distance between the tray 8 and the lower end part of the inner well pipe 2 is 30-50mm. The inner well pipe section that infiltration wall 9 department corresponds is the strainer, and the height of infiltration wall 9 and this strainer is 1500-2500mm, and the infiltration wall support still has the deflector, and the deflector has the breach, the inside wall of inner well pipe 2 be provided with be used for with breach matched with sand grip, sand grip and deflector sliding connection for the infiltration wall support can reciprocate along the inner wall of inner well pipe 2. The sand grip and the guide plate are arranged, so that the permeable wall is convenient to install or replace.
In this embodiment, the material of the permeable wall 9 is one or more selected from activated carbon, zero-valent iron, bentonite, zeolite, synthetic ion exchange resin, and limestone. One, two or more of them can be selected.
An annular support can be arranged in the inner well pipe 2, a tray 8 of the annular support is also annular, the tray 8 is used for placing a permeable wall 9, the distance between the bottom end of the tray 8 and the bottom end of the inner well pipe 2 is 30-50mm, the tray 8 is of a stainless steel structure, the width of the tray is 300-850mm, and the height of the support can be 1500-2500mm.
The bracket is used for placing the permeable wall 9, and the material of the permeable wall 9 comprises material media which can comprise activated carbon, zero-valent iron, zeolite, synthetic ion exchange resin, limestone and the like. A material media may be disposed between the two network layers.
The permeable wall 9 can be selected from activated carbon, zero-valent iron and bentonite according to different heavy metal pollutant types and concentration conditions, and the optimal proportion is carried out.
The permeable wall 9 is placed on the bracket arranged on the inner well pipe 2, and the permeable wall 9 is provided with a permeable wall cover plate 7. The permeable wall cover plate 7 is covered on the permeable wall 9. This allows the infiltration wall 9 to be pulled out for cleaning or replacement.
The dredging device comprises a sewage extraction device 14 and a dredging pipe 15, one end of the dredging pipe 15 is communicated with the bottom cavity 10, and the other end of the dredging pipe 15 is communicated with the sewage extraction device 14. The sewage pumping device 14 can be an air compressor, so that the dredging device is a dredging pipe 15 connected with the air compressor, the dredging pipe 15 is made of a stainless steel seamless steel pipe, and the dredging pipe 15 extends into the main well and penetrates through the bottom plate of the inner well pipe to be communicated with the bottom cavity 10 (sedimentation tank).
The sewage extraction device 14 may be fixed to the permeate wall cover plate 7 on the permeate wall 9. Of course the sewage extraction device 14 may also be located above ground level. The water pump 11 and its water pipes can also be fixed to the permeable wall cover 7, although the water pump 11 is also placed at the bottom end inside the inner well pipe 2.
Preferably, the outer well pipe 1 comprises a settling pipe, a lower filter pipe, a solid pipe, an upper filter pipe and a solid pipe from bottom to top. The lower filter pipe is a lower filter pipe section 6 in fig. 1, and the upper filter pipe is an upper filter pipe section 5 in fig. 1.
The length of the lower water filtering pipe section 6 is 1500-2500mm; the length of the upper water filtering pipe section 5 is 800-1500mm.
The upper filter pipe and the lower filter pipe can adopt a trapezoidal slotted structure, namely trapezoidal gaps are processed on a steel plate and then welded into a well pipe structure, and the width of the gaps is determined according to the thickness of aquifer particles; the upper water filtering pipe and the lower water filtering pipe can adopt a wire winding structure, namely a well pipe structure is formed by welding wire windings and vertical wires, and gaps among the wire windings are determined according to the size of particles of the aquifer. The arrangement can effectively reduce the blocking probability of the filter pipe.
According to another aspect of the invention, a heavy metal pollutant combined treatment circulating well is provided, which comprises a circulating well main well 23 and a circulating well auxiliary well 19 (monitoring well), wherein a well body structure of the heavy metal pollutant combined treatment circulating well according to any one of the above technical schemes is arranged in the circulating well main well 23.
A plurality of auxiliary circulating well wells 19 are arranged on one side of the main circulating well 23, electrodes are arranged in any two auxiliary circulating well wells 19, wherein a negative electrode 18 is arranged in the auxiliary circulating well 19 close to the main circulating well 23, a positive electrode 17 is arranged in the auxiliary circulating well 19 far away from the main circulating well 23, the negative electrode 18 is connected with the cathode of the direct-current power supply 16, and the positive electrode 17 is connected with the anode of the direct-current power supply 16.
Or,
a plurality of auxiliary circulating well wells 19 are arranged on one side of the main circulating well 23, electrodes are arranged in any two auxiliary circulating well wells 19, a negative electrode 18 is arranged in the auxiliary circulating well 19 close to the main circulating well 23, a positive electrode 17 is arranged in the auxiliary circulating well 19 far away from the main circulating well 23, the negative electrode 18 is connected with the cathode of the direct-current power supply 16, and the positive electrode 17 is connected with the anode of the direct-current power supply 16;
the other side of the main circulating well 23 is also provided with a plurality of auxiliary circulating wells 19, electrodes are arranged in any two auxiliary circulating wells 19, wherein a negative electrode 18 is arranged in the auxiliary circulating well 19 close to the main circulating well 23, a positive electrode 17 is arranged in the auxiliary circulating well 19 far away from the main circulating well 23, the negative electrode 18 is connected with the cathode of the direct-current power supply 16, and the positive electrode 17 is connected with the anode of the direct-current power supply 16. In fig. 2, a plurality of circulation well auxiliary wells 19 are provided on both left and right sides of the circulation well main well 23.
Preferably, the upper water storage ring is 400-600mm higher than the ground, the cross section of the main circulating well 23 is in a runway shape or a rectangle shape, the depth of the main circulating well 23 is 5-20m, the width of the well is 1000-2000mm, the length of the well is 5-10m, and the specific structural size of the well can be determined according to the width and the depth of the underground water pollution plume.
The top of the upper water storage ring is preferably 500mm higher than the ground; of course, the top end of the upper water storage ring may be higher than the ground by more than 500mm, for example, the top end of the upper water storage ring is higher than the ground by at least 500mm. The purified underground water is pumped to the upper water storage ring and is injected into the stratum through a water filter pipe arranged on the upper water storage ring. The upper water storage ring forms a long and narrow ring structure, and the underground water in the upper water storage ring and the stratum corresponding to the upper water filtering pipe section easily form hydraulic gradient difference, so that the underground water is favorably injected into the stratum.
The working principle of the circulating well technology is as follows: the three-dimensional circulating flow field of water is established in the circulating well area, the pollutants are flushed and driven into the well by circulating flow, and the pollutants in the water are removed by physical, chemical and biological technologies, so that the groundwater is repaired. The permeable wall is built in a circulating well, the action of an external electric field is adopted to promote heavy metal pollutants to be separated from soil particles in an aeration zone and a water-bearing zone, enter underground water and migrate to the circulating well, when the heavy metal pollutants pass through the permeable wall, the heavy metal pollutants are treated, the treated underground water is pumped into an upper water storage ring (an upper water storage ring) through a water pump and is discharged into a stratum through the upper water storage ring.
As shown in fig. 1, groundwater enters the annular lower cavity 4 (lower water storage ring) through the lower water filtering pipe section 6, large granular gravel and formed sediment sink into the sedimentation tank 10, the groundwater enters the permeable wall 9 after filling the annular lower cavity 4 (lower water storage ring), pollutants are purified by the permeable wall in the permeable wall 9, the groundwater enters the main well, the groundwater is pumped into the annular upper cavity 3 (upper water storage ring) through the water pump 11, and the groundwater is injected into the stratum through the upper water filtering pipe section 5 to form three-dimensional circulation of the groundwater. The area between the two waves in fig. 1 is the pollution area 20, 21 is the groundwater level and 22 is the ground.
In order to enable heavy metal ions to be separated from soil particles and enter underground water, an external electric field is arranged, an anode electrode plate and a cathode electrode plate are respectively placed into respective auxiliary wells 19 (monitoring wells) of a circulation well, the cathode electrode plate is close to the main well of the circulation well, a power supply is cut off after the circulation well is electrified for about 8 hours or the current is stabilized, the anode electrode plate is pulled out, the anode electrode plate is placed into the monitoring well where the cathode electrode plate is located, the cathode electrode plate is placed into the monitoring well which is closer to the main well, specifically, as shown in fig. 2, the anode electrode plate is placed into the first monitoring well (auxiliary well 19) on the left side in the drawing, the cathode electrode plate is placed into the second monitoring well on the left side, after the electrification is finished, the anode electrode plate is pulled out, the anode electrode plate is placed into the second monitoring well on the left side, the cathode electrode plate is placed into the third monitoring well on the left side, and then the power supply is switched on. The circulating well on the other side of the main well is also provided with electrodes for electrifying in the same sequence. If multiple rows of circulation wells are provided, each row of circulation wells may be operated accordingly. The monitoring well can be also provided with an inductor, and the concentration change of pollutants in underground water in the well can be monitored. The monitoring wells can be arranged in one row, and can also be arranged in two rows or more rows according to the distribution range of pollutants.
In fig. 2, three circulation well auxiliary wells 19 on the left side of the circulation well main well 23 are a 1# monitoring well, a 2# monitoring well and a 3# monitoring well respectively; the three auxiliary circulating well wells 19 on the right side of the main circulating well 23 are a 4# monitoring well, a 5# monitoring well and a 6# monitoring well respectively;
placing the anode electrode plate into a No. 1 monitoring well in figure 2, placing the cathode electrode plate into a No. 2 monitoring well, pulling out the electrode plate after the electrification is finished (after the electrification is carried out for about 8h or the current is stabilized, cutting off the power supply), placing the anode electrode plate into the No. 2 monitoring well, placing the cathode electrode plate into the No. 3 monitoring well, and then switching on the power supply. The electrodes are placed in the circulation well on the other side of the main well and powered on in the same sequence, for example, an anode electrode plate is placed in a No. 6 monitoring well in the figure, a cathode electrode plate is placed in a No. 5 monitoring well, after the power on is finished, the electrode plate is pulled out, the anode electrode plate is placed in the No. 5 monitoring well, the cathode electrode plate is placed in a No. 4 monitoring well, and then the power supply is switched on. If multiple rows of circulation wells are provided, each row of circulation wells may be operated accordingly.
The applied electric field means may include a dc power supply 16, an ammeter, a cathode electrode 18 and an anode electrode 17. The cathode electrode 18 and anode electrode 17 materials can be ruthenium iridium coated titanium mesh and graphite. For example: the anode electrode 17 can be made of ruthenium iridium coating titanium mesh, and the cathode electrode 18 can be made of graphite; the cathode electrode 18 can be made of ruthenium iridium coating titanium mesh, and the anode electrode 17 can be made of graphite; the cathode electrode 18 and the anode electrode 17 can be made of ruthenium iridium coated titanium mesh; the cathode electrode 18 and the anode electrode 17 may be made of graphite. The positive electrode 17 and the negative electrode 18 are both electrically connected with a direct current power supply 16, and the voltage of the direct current power supply 16 can be 30V.
The technical points are as follows:
1. establishing a three-dimensional circulating flow field of water in the circulating well area, and flushing by a circulating flow and driving pollutants into the well;
2. the permeable wall is built in the circulating well, and pollutants are removed when the pollutants are carried by three-dimensional water flow formed around the circulating well and pass through the permeable wall;
3. in a monitoring well designed in a heavy metal pollutant distribution area, an electrode is put in, heavy metal ions are separated from soil particles through an external electric field, enter underground water and move to a circulating well;
4. a water-resisting bottom plate is arranged in the double-well pipe structure, and a water storage ring is formed on the upper layer and is separated from the lower layer;
5. pumping the treated underground water into the upper water storage ring through a water pump;
6. the speed and the depth of underground water entering the stratum are increased by pressurizing the water storage ring, so that the circulation radius is enlarged;
7. the pumping and injection water is kept balanced, the overlarge disturbance to the stratum is prevented, and the influence radius of the circulating well is increased.
8. The lower-layer underground water firstly enters the lower-layer water storage ring through the filter pipe, and a part of particles in the water can be precipitated to prevent the particles from entering the permeable wall;
9. the bottom is provided with a sedimentation tank for regularly cleaning sediment.
The well body structure of the circulating well for the composite treatment of the heavy metal pollutants and the circulating well in the embodiments can remarkably improve the treatment efficiency by the combined use of a plurality of repairing technologies in the effective treatment process of underground water, have small environmental disturbance, can accelerate the repairing speed, fully ensure the repairing efficiency, save the cost, have strong practicability and have high popularization value; the problem of dig among the prior art polluted site area big, repair time is long, infiltration wall is difficult to clear up or change is solved.
The invention has the following advantages:
1. the pumping and injection water is kept balanced, and overlarge disturbance to the stratum is prevented;
2. the permeable wall is arranged in the well, so that the excavation area of soil is reduced, pollutants are brought into the permeable wall more by circulation of underground water for treatment, and pollution plume bypass flow is prevented;
3. the underground water enters the water storage ring after passing through the circulating well water filter pipe, part of sediment and particles can sink to the bottom of the water storage ring and cannot enter the permeable wall, so that the blocking probability of the permeable wall is reduced, and the service life of the permeable wall is prolonged;
4. heavy metals are guided to be separated from soil particles through the electric field device, enter underground water and flow into the circulating well, so that the repairing radius of the circulating well is enlarged, and the repairing efficiency is improved;
5. the permeable wall can be lifted out of the well for cleaning or replacement.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, variations and modifications can be made without departing from the spirit of the present invention, and equivalent embodiments or modifications made without departing from the spirit of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A well body structure of a circulating well for composite treatment of heavy metal pollutants is characterized by comprising an outer well pipe (1) and an inner well pipe (2) sleeved in the outer well pipe (1), wherein the bottoms of the outer well pipe (1) and the inner well pipe (2) are both sealing structures, an annular cavity is formed between the outer side wall of the inner well pipe (2) and the outer well pipe (1), a partition plate is arranged in the annular cavity and divides the annular cavity into an annular upper cavity (3) and an annular lower cavity (4) which are not communicated with each other;
the bottom of interior well casing (2) with form between the bottom of outer well casing (1) with bottom cavity (10) of cavity (4) intercommunication under the annular, the inner wall department of interior well casing (2) is provided with infiltration wall (9), the interior well casing section that infiltration wall (9) department corresponds is the drainage pipe, interior well casing (2) are through water pump (11) intercommunication cavity (3) on the annular, the outer well casing section that cavity (3) corresponds on the annular has the drainage pipe section, the outer well casing section that cavity (4) corresponds under the annular also has the drainage pipe section.
2. The well body structure of the heavy metal pollutant combined treatment circulating well is characterized by further comprising a dredging device, wherein the dredging device comprises a sewage extraction device (14) and a dredging pipe (15), one end of the dredging pipe (15) is communicated with the bottom cavity (10), and the other end of the dredging pipe (15) is communicated with the sewage extraction device (14).
3. The well body structure of the heavy metal pollutant combined treatment circulating well according to claim 1 or 2, characterized in that a penetration wall support is arranged in the inner well pipe (2), an outward tray (8) is arranged on the periphery of the bottom end of the penetration wall support, the tray (8) is used for placing a penetration wall (9), the width of the tray (8) is 300-850mm, the distance between the tray (8) and the lower end of the inner well pipe (2) is 30-50mm, the inner well pipe section corresponding to the penetration wall (9) is a strainer, the height of the penetration wall (9) and the strainer is 1500-2500mm, the penetration wall support further comprises a guide plate, the guide plate is provided with a gap, the inner side wall of the inner well pipe (2) is provided with a raised strip matched with the gap, and the raised strip is slidably connected with the guide plate, so that the penetration wall support can move up and down along the inner wall of the inner well pipe (2).
4. The well body structure of the heavy metal pollutant combined treatment circulating well is characterized by further comprising a permeable wall cover plate (7) arranged in the inner well pipe (2), wherein the permeable wall cover plate (7) is covered on the permeable wall (9).
5. The well body structure of the heavy metal pollutant composite treatment circulating well according to the claim 1 or 2, characterized in that the cross section of the outer well pipe (1) and the inner well pipe (2) is in a race track shape, or the cross section of the outer well pipe (1) and the inner well pipe (2) is in a rectangle shape.
6. The well body structure of the heavy metal pollutant composite treatment circulating well is characterized in that the outer well pipe (1) and the inner well pipe (2) are both made of stainless steel, the wall thickness of the outer well pipe (1) is 6-13mm, the wall thickness of the inner well pipe (2) is 3-6mm, and the outer well pipe (1) and the inner well pipe (2) are both formed by welding;
the distance between the bottom of the outer well pipe (1) and the bottom of the inner well pipe (2) is 900-1100mm, and the annular width of the annular cavity is 100-300mm.
7. The well body structure of the circulating well for the combined treatment of heavy metal pollutants as claimed in claim 1 or 2, wherein the outer well pipe (1) comprises a settling pipe, a lower water filtering pipe, a solid pipe, an upper water filtering pipe and a solid pipe from bottom to top; the length of the lower filter pipe is 1500-2500mm, the length of the upper filter pipe is 800-1500mm, and the upper filter pipe and the lower filter pipe are filter pipes adopting a trapezoidal cut seam structure, or the upper filter pipe and the lower filter pipe are filter pipes adopting a wire winding structure.
8. The well body structure of the heavy metal pollutant combined treatment circulating well is characterized in that the material of the permeable wall (9) is one or more of activated carbon, zero-valent iron, bentonite, zeolite, synthetic ion exchange resin and limestone.
9. A circulating well for the combined treatment of heavy metal pollutants, which is characterized by comprising a main circulating well (23) and an auxiliary circulating well (19), wherein the main circulating well is internally provided with a well body structure of the circulating well for the combined treatment of heavy metal pollutants according to any one of claims 1 to 8;
a plurality of auxiliary circulating well wells (19) are arranged on one side of the main circulating well, electrodes are arranged in any two auxiliary circulating well wells (19), a negative electrode (18) is arranged in the auxiliary circulating well close to the main circulating well, a positive electrode (17) is arranged in the auxiliary circulating well far away from the main circulating well, the negative electrode (18) is connected with the cathode of a direct current power supply (16), and the positive electrode (17) is connected with the anode of the direct current power supply (16);
or,
a plurality of auxiliary circulating well wells (19) are arranged on one side of the main circulating well, electrodes are arranged in any two auxiliary circulating well wells (19), a negative electrode (18) is arranged in the auxiliary circulating well close to the main circulating well, a positive electrode (17) is arranged in the auxiliary circulating well far away from the main circulating well, the negative electrode (18) is connected with the cathode of a direct-current power supply (16), and the positive electrode (17) is connected with the anode of the direct-current power supply (16);
the other side of the main circulating well is also provided with a plurality of auxiliary circulating well wells (19), electrodes are arranged in any two auxiliary circulating well wells (19), a negative electrode (18) is arranged in the auxiliary circulating well close to the main circulating well, a positive electrode (17) is arranged in the auxiliary circulating well far away from the main circulating well, the negative electrode (18) is connected with the cathode of the direct-current power supply (16), and the positive electrode (17) is connected with the anode of the direct-current power supply (16).
10. The circulating well for combined treatment of heavy metal pollutants as claimed in claim 9, wherein the top end of the annular upper cavity (3) is 400-600mm higher than the ground, the cross section of the main circulating well (23) is in a runway shape or a rectangle shape, the depth of the main circulating well (23) is 5-20m, the width of the well is 1000-2000mm, and the length of the well is 5-10m.
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| CN202211149273.3A CN115893701A (en) | 2022-09-21 | 2022-09-21 | Heavy metal pollutant combined treatment circulation well body structure and circulation well |
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| CN202211149273.3A CN115893701A (en) | 2022-09-21 | 2022-09-21 | Heavy metal pollutant combined treatment circulation well body structure and circulation well |
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