A multi-stage in-situ treatment device and method for contaminated groundwater

Abstract

This invention discloses a multi-stage in-situ treatment device and method for polluted groundwater, including an underground extraction and filtration mechanism, a chemical sedimentation mechanism, an evaporation purification mechanism, and a plant purification mechanism installed on the ground. The extraction and filtration mechanism includes an extraction mechanism support pipe that extends vertically and is fixed in the soil with its lower end connected to the groundwater. A vertically extending extraction drive pipe and a filter receiving pipe are fixed inside the extraction mechanism support pipe. The chemical sedimentation mechanism includes multiple upward-facing and inclined chemical sedimentation flow channels. A chemical delivery pipe is fixed inside the higher end of the chemical sedimentation flow channel, and multiple chemical dosing nozzles are provided on the back side of the chemical delivery pipe. The extraction and filtration mechanism extracts and filters the groundwater. The extraction drive mechanism uses wind power to lift the extraction drive piston to a high position, and then uses the gravitational potential energy of the extraction drive piston to drive the groundwater to circulate. The device is easy to maintain and has extremely low long-term operating costs.

Description

Technical Field

[0001] This invention relates to the field of groundwater treatment technology, specifically to a multi-stage in-situ treatment device and method for contaminated groundwater. Background Technology

[0002] Groundwater pollution is a phenomenon caused by human factors that deteriorate groundwater quality. The main causes of groundwater pollution include: direct discharge of industrial wastewater into the ground; intrusion of polluted surface water into underground aquifers; and seepage of water contaminated by human or animal excrement or excessive pesticide use. The result of pollution is an increase in the levels of harmful components in groundwater, such as phenols, chromium, mercury, arsenic, radioactive substances, bacteria, and organic matter. Polluted groundwater poses a threat to human health and industrial and agricultural production.

[0003] Current groundwater remediation methods are either time-consuming, labor-intensive, and costly, or their remediation effects are unsatisfactory. Groundwater remediation methods need further improvement and optimization to be energy-efficient, operate at low power consumption, and achieve good remediation results. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-stage in-situ treatment device and method for contaminated groundwater, which can perform long-term remediation and purification of contaminated groundwater with very low cost and power consumption.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A multi-stage in-situ treatment device for polluted groundwater includes an underground extraction and filtration mechanism, a reagent precipitation mechanism, an evaporation purification mechanism, and a plant purification mechanism installed on the ground.

[0007] The extraction and filtration mechanism includes an extraction mechanism support pipe that extends vertically and is fixed in the soil with its lower end connected to groundwater;

[0008] The extraction mechanism support tube is fixed with a vertically extending extraction drive tube and a filter receiving tube.

[0009] An extraction drive piston is slidably connected inside the extraction drive tube, and an extraction input tube and an extraction output tube that communicate with the inside are fixed on the outside of the extraction drive tube.

[0010] The other end of the extraction output tube is connected to the inside of the filter container tube, which contains multiple water purification filter cartridges.

[0011] The water purification filter cartridge is one or more of the following combined in series: PP filter cartridge, reverse osmosis membrane filter cartridge, pleated microporous membrane filter cartridge, ceramic filter cartridge, activated carbon filter cartridge, manganese sand filter cartridge, and ultrafiltration membrane filter cartridge;

[0012] A vertically extending aeration container tube is fixed inside the extraction mechanism support tube. The top of the aeration container tube is connected to the top of the filter container tube. An aeration conveying shell is fixed at the bottom inside the aeration container tube. The top of the aeration conveying shell has an aeration conveying pipe connected to its interior. The top of the aeration conveying shell has multiple aeration nozzles connected to its interior.

[0013] Explanation: Aeration treatment of filtered groundwater in the aeration container increases the dissolved oxygen content of the groundwater, which is beneficial for the absorption and decomposition of pollutants in the groundwater by naturally incorporated microorganisms. These naturally incorporated microorganisms will be inactivated in the subsequent evaporation and purification process, avoiding secondary pollution of the groundwater by miscellaneous bacteria.

[0014] The drug precipitation mechanism includes multiple upward-facing and inclined drug precipitation flow channels, with the angle between the drug precipitation flow channels and the horizontal plane being 0.1 to 3°.

[0015] A chemical delivery pipe is fixed inside the higher end of the chemical sedimentation and flow tank, and multiple chemical dosing nozzles are provided on the back water side of the chemical delivery pipe.

[0016] The aeration container pipe is connected to the reagent sedimentation flow tank;

[0017] The evaporation purification mechanism includes an evaporation mechanism sealed shell, a conical evaporation support shell fixed inside the evaporation mechanism sealed shell, an evaporation input pipe fixed at the top of the conical evaporation support shell, and a spirally extending evaporation slow flow groove on the side of the conical evaporation support shell.

[0018] A flow-slowing baffle ring is fixed at the edge of the conical evaporator support shell;

[0019] An evaporation slow flow discharge pipe connected to the evaporation slow flow groove is fixed at the edge of the conical evaporation support shell;

[0020] An annular, upward-facing purification collection tank is fixed at the bottom of the sealed shell of the evaporation mechanism, and a purification discharge pipe connected to the inside of the purification collection tank is fixed at the bottom of the purification collection tank.

[0021] The reagent precipitation flow tank is connected to the evaporation input pipe;

[0022] The plant purification mechanism includes an upward-opening plant purification flow channel, inside which multiple plant support plates are fixed.

[0023] The plant support board has multiple plant receiving notches on its side, and the inner wall of the plant receiving notches has a fixing plate groove, in which a plant fixing constraint plate is slidably connected.

[0024] Description: The roots of the restorative plants are submerged in groundwater, and the plants absorb and purify pollutants in the groundwater.

[0025] The purification discharge pipe is connected to the plant purification circulation channel.

[0026] Preferably, the extraction drive piston is driven to move by the extraction drive mechanism, which includes an extraction drive housing, a steel cable winding wheel rotatably connected inside the extraction drive housing, an extraction steel cable wound on the steel cable winding wheel, and the outer end of the extraction steel cable being fixedly connected to the extraction drive piston.

[0027] A worm gear drive shaft is rotatably connected inside the extraction drive housing, and a driven worm gear is fixed on the worm gear drive shaft. A worm drive shaft is rotatably connected inside the extraction drive housing, and a driving worm is fixed on the worm drive shaft. The driving worm meshes with the driven worm gear.

[0028] The worm gear drive shaft is connected to the shaft of the steel cable winding wheel via a transmission clutch A. A vertically extending and hollow fan support rod is fixed to the top of the extraction drive housing. A wind-driven blade is rotatably connected to the top of the fan support rod. The shaft of the wind-driven blade is connected to the worm gear drive shaft via a gear transmission set.

[0029] Explanation: The extraction drive mechanism drives the extraction drive piston. When the wind is strong enough, the wind drives the wind-driven blades to rotate. The wind-driven blades drive the worm gear drive shaft to rotate through the gear transmission set. The driving worm on the worm gear drive shaft then drives the driven worm wheel to rotate. The driven worm wheel's shaft drives the cable winding wheel to rotate through the transmission clutch A. Finally, the cable winding wheel drives the extraction drive piston to move upward by extracting the cable.

[0030] Preferably, multiple solar panels are fixed on the ground, and the electrical energy generated by the solar panels is stored in a battery. The battery is fixed inside the extraction drive housing, and a backup drive motor is fixed inside the extraction drive housing. The output shaft of the backup drive motor is connected to the worm gear drive shaft through a transmission clutch B.

[0031] Explanation: When the wind force is insufficient, the backup drive motor drives the worm gear drive shaft to rotate through the transmission clutch B. The driving worm on the worm gear drive shaft then drives the driven worm wheel to rotate. The shaft of the driven worm wheel drives the cable winding wheel to rotate through the transmission clutch A. Finally, the cable winding wheel drives the lifting drive piston to move upward by lifting the cable.

[0032] Preferably, an isolation and filtration mechanism is provided inside the lower end of the extraction mechanism support pipe. The isolation and filtration mechanism includes an isolation and filtration channel shell fixed inside the lower end of the extraction mechanism support pipe and extending along the direction of groundwater flow. The side wall of the extraction mechanism support pipe has a filtration input opening and a filtration output opening that are respectively connected to both ends of the isolation and filtration channel shell. An opening barrier filter plate is fixed in both the filtration input opening and the filtration output opening. An isolation and filtration plate is connected to the top of the isolation and filtration channel shell through a fixed hinge C. The isolation and filtration plate divides the inside of the isolation and filtration channel shell into an isolation input chamber and an isolation output chamber. The extraction input pipe is connected to the isolation output chamber.

[0033] The isolation filter plate is obliquely installed in the isolation filter channel shell, and an impact baffle is fixed at the lower end of the isolation filter plate. The impact baffle is supported in contact with the bottom of the isolation filter channel shell.

[0034] Note: The original groundwater is isolated and treated using an isolation and filtration mechanism to prevent impurities in the groundwater from clogging the relevant components of the extraction drive pipe.

[0035] Preferably, a particle interception pad and a particle interception plate are fixed at the bottom of the reagent precipitation flow tank.

[0036] The particle interception pad is made of velvet, and the particle interception plate is a mesh plate with open top and bottom sides.

[0037] Explanation: Under the action of the remediation agent, precipitates are formed in the groundwater. The precipitate particles settle into the particle interception plate and the microparticle interception pad under their own weight.

[0038] Preferably, the bottom of the conical evaporation support shell is tightly fixed to the evaporation heating shell, the top of the evaporation heating shell has a heat-absorbing coating, the evaporation heating shell is fixed inside the evaporation heating shell, the fiber optic support plate has multiple vertical through holes, the through holes are fixed with fiber optic receiving tubes, the fiber optic receiving tubes are fixed with multiple optical fibers, and the top of the fiber optic receiving tubes is fixed with a focusing lens group.

[0039] Explanation: Sunlight is transmitted to the focusing lens group through optical fiber. The focusing lens group focuses the sunlight on the top of the evaporation heating shell. The photothermal energy is used to heat the evaporation heating shell and indirectly heat the conical evaporation support shell through heat conduction, so as to promote the evaporation of groundwater.

[0040] Preferably, a condensation guide plate is fixed to the inner wall of the sealed shell of the evaporation mechanism, and the side of the condensation guide plate has multiple parallel condensation guide grooves.

[0041] Note: The reliquefied water can flow more smoothly along the condensation guide channel on the condensation guide plate to the purification collection tank.

[0042] Preferably, a multi-stage in-situ treatment method for contaminated groundwater, based on the above-mentioned multi-stage in-situ treatment equipment for contaminated groundwater, includes the following steps:

[0043] S1. Extraction and filtration:

[0044] The extraction drive piston in the extraction filtration mechanism is driven by a winch to move upward in the extraction drive tube. Groundwater enters the extraction drive tube through the extraction input pipe. When the extraction drive piston moves to the top dead center, it moves downward in the extraction drive tube under its own weight. The groundwater in the extraction drive tube is transported to the filter receiving tube through the extraction output pipe as the extraction drive piston moves downward. During the upward flow of the groundwater in the filter receiving tube, the groundwater is filtered and purified by the water purification filter element.

[0045] S2. Chemical remediation of groundwater:

[0046] Multiple chemical sedimentation mechanisms are arranged in parallel. The filtered and purified groundwater is transported to each chemical sedimentation flow tank. The remediation agent is introduced into the chemical delivery pipe by the delivery pump. The remediation agent is sprayed out from each chemical dosing nozzle and mixed with the groundwater.

[0047] The water flow velocity in the reagent sedimentation and flow tank is controlled at 0.1–0.6 m / s;

[0048] At 2-10g / m 3 The remediation agent is added to the groundwater at a certain dosage. The remediation agent is composed of calcium polysulfide, sodium sulfide, lime, ferrous salt, and calcium salt.

[0049] Under the action of the remediation agent, precipitates are formed in the groundwater, and the precipitate particles settle into the particle interception plate under their own weight.

[0050] S3. Evaporation purification of groundwater:

[0051] Multiple evaporation and purification units are arranged in series, with the upstream evaporation slow-flow discharge pipe connected to the adjacent downstream evaporation input pipe;

[0052] The groundwater output from the reagent sedimentation flow tank is then transported to the evaporation input pipe. The groundwater flowing out of the evaporation input pipe flows from top to bottom along the evaporation slow flow tank. The groundwater evaporates continuously during the flow of the groundwater along the evaporation slow flow tank. The water vapor liquefies after encountering the inner wall of the sealed shell of the evaporation mechanism and flows into the purification collection tank along the inner wall of the sealed shell of the evaporation mechanism.

[0053] Unevaporated groundwater flows out from the lower end of the evaporation slow flow tank and is then discharged through the evaporation slow flow discharge pipe and then transported to the next evaporation input pipe. Multiple evaporation purification mechanisms arranged in series are used to continuously evaporate and purify the groundwater.

[0054] S4. Utilizing plants to absorb and treat groundwater:

[0055] After evaporation and purification, the groundwater is discharged through the purification discharge pipe and transported into the plant purification circulation channel. Multiple restoration plants are fixed on the plant support plate.

[0056] The roots of restorative plants are submerged in groundwater, and the plants absorb and purify pollutants in the groundwater.

[0057] Compared with the prior art, the beneficial effects of the present invention are reflected in the following aspects:

[0058] 1. The present invention has a reasonable structural design. It uses an extraction and filtration mechanism to extract and filter groundwater. The extraction drive mechanism uses wind power to lift the extraction drive piston to a high position, and then uses the gravitational potential energy of the extraction drive piston to drive the groundwater to circulate. It is easy to maintain and has extremely low long-term operating costs.

[0059] 2. This invention is easy to operate. It aerates the filtered groundwater in the aeration container to increase the dissolved oxygen in the groundwater, which is beneficial for the natural microorganisms mixed in the groundwater to absorb and decompose pollutants in the groundwater. These naturally mixed microorganisms will be inactivated in the subsequent evaporation and purification process, avoiding secondary pollution of the groundwater by miscellaneous bacteria.

[0060] 3. In the technical solution of the present invention, multiple reagent precipitation mechanisms are arranged in parallel to transport groundwater to each reagent precipitation flow tank, and remediation agents are added to the groundwater using each reagent dosing nozzle. The remediation agents react with pollutants in the groundwater to form precipitates, and the precipitate particles sink into the particle interception plate under their own weight.

[0061] 4. In the technical solution of the present invention, multiple evaporation and purification mechanisms are arranged in series. The upstream evaporation slow-flow discharge pipe is connected to the adjacent downstream evaporation input pipe. According to the horizontal height calculation, the upstream evaporation slow-flow discharge pipe is higher than the adjacent downstream evaporation input pipe, so that the water flow can flow by itself under the action of gravity, avoiding the waste of additional energy.

[0062] 5. In the technical solution of the present invention, the evaporation heating shell is heated by photothermal energy and the conical evaporation support shell is indirectly heated by heat conduction to promote the evaporation of groundwater;

[0063] 6. In the technical solution of the present invention, groundwater is transported into a plant purification circulation channel, and multiple restoration plants are fixed on the plant support plate. The roots of the restoration plants are submerged in the groundwater, and the pollutants in the groundwater are absorbed and purified by the absorption effect of the restoration plants. Attached Figure Description

[0064] Figure 1This is a schematic diagram of the overall layout of the present invention;

[0065] Figure 2 This is a schematic diagram of the extraction and filtration mechanism of the present invention;

[0066] Figure 3 yes Figure 2 Top view;

[0067] Figure 4 This is a top view of the extraction drive tube of the present invention;

[0068] Figure 5 This is a schematic diagram of the aeration containment tube of the present invention;

[0069] Figure 6 This is a schematic diagram of the extraction drive mechanism of the present invention;

[0070] Figure 7 yes Figure 6 Top view;

[0071] Figure 8 This is a schematic diagram of the isolation and filtration mechanism of the present invention;

[0072] Figure 9 This is a schematic diagram of the drug precipitation mechanism of the present invention;

[0073] Figure 10 yes Figure 9 The left view;

[0074] Figure 11 This is a schematic diagram of the evaporation purification mechanism of the present invention;

[0075] Figure 12 yes Figure 11 Top view;

[0076] Figure 13 This is a schematic diagram of the plant purification mechanism of the present invention;

[0077] Figure 14 This is a top view of the plant support plate of the present invention.

[0078] In the diagram, 10-extraction filtration mechanism, 11-extraction mechanism support pipe, 12-extraction drive pipe, 121-extraction drive piston, 122-extraction input pipe, 1221-extraction input check valve, 123-extraction output pipe, 1231-extraction output check valve, 13-filter housing pipe, 131-filter cartridge housing, 132-purified water filter cartridge, 14-aeration housing pipe, 141-aeration conveying shell, 142-aeration conveying pipe, 143-aeration nozzle, 15-extraction drive mechanism, 150-extraction drive housing, 151-steel cable winding wheel, 152-extraction steel cable, 153- 154-Driven worm gear, 155-Worm drive shaft, 156-Driving worm, 157-Transmission clutch A, 158-Wind turbine support rod, 159-Wind power drive blade, 161-Solar power panel, 162-Battery, 163-Backup drive motor, 164-Transmission clutch B, 17-Isolation and filtration mechanism, 171-Isolation and filtration channel shell, 172-Filtration input opening, 173-Filtration output opening, 174-Opening barrier filter plate, 175-Fixed hinge C, 176-Isolation and filtration plate, 1761-Isolation input chamber, 1762-Isolation... 177-Impact baffle plate, 181-Impurity impact pipe, 182-Impact output pipe, 183-Impact control valve, 20-Reagent sedimentation mechanism, 21-Reagent sedimentation flow channel, 22-Reagent delivery pipe, 221-Reagent dosing nozzle, 231-Particle interception pad, 232-Particle interception plate, 24-Sedimentation flow channel cover plate, 241-Fixed hinge A, 242-Fixed hinge B, 243-Sedimentation barrier plate, 30-Evaporation purification mechanism, 31-Evaporation mechanism sealed shell, 311-Condensation guide plate, 312-Condensation guide channel, 32-Conical evaporation support shell 320-Evaporation input pipe, 321-Evaporation slow flow groove, 322-Slow flow baffle ring, 323-Evaporation slow flow discharge pipe, 33-Purification collection groove, 331-Purification discharge pipe, 34-Evaporation heating shell, 341-Fiber optic support plate, 342-Fixed through hole, 343-Fiber optic receiving tube, 344-Light guiding fiber, 345-Focusing lens group, 40-Plant purification mechanism, 41-Plant purification flow groove, 42-Plant support plate, 421-Plant receiving notch, 422-Fixed plate groove, 423-Plant fixing constraint plate, 424-Plant fixing constraint hole, 50-Purification injection well. Detailed Implementation

[0079] The following is combined Figures 1-14 The present invention will be described in detail. For ease of description, the orientations mentioned below are defined as follows: The directions of up, down, left, right, front, and back mentioned below are consistent with the directions of up, down, left, right, front, and back in the projection relationship of the respective main view or structural schematic diagram.

[0080] Example 1:

[0081] A multi-stage in-situ treatment system for contaminated groundwater, such as Figure 1 As shown, it includes an extraction and filtration mechanism 10 installed underground, a reagent precipitation mechanism 20 installed on the ground, and an evaporation and purification mechanism 30.

[0082] like Figure 2 As shown, the extraction and filtration mechanism 10 includes an extraction mechanism support pipe 11 that extends vertically and is fixed in the soil and whose lower end is connected to groundwater.

[0083] like Figure 2 As shown, the extraction mechanism support tube 11 is fixed with a vertically extending extraction drive tube 12 and a filter receiving tube 13.

[0084] like Figure 2 As shown, an extraction drive piston 121 is slidably connected inside the extraction drive tube 12. An extraction input tube 122 and an extraction output tube 123 are fixed on the outside of the extraction drive tube 12 and communicate with its interior. An extraction input check valve 1221 is provided inside the extraction input tube 122, and an extraction output check valve 1231 is provided inside the extraction output tube 123.

[0085] The winch drives the extraction drive piston 121 to move within the extraction drive tube 12.

[0086] The other end of the extraction output tube 123 is connected to the inside of the filter receiving tube 13, such as Figure 2 As shown, multiple filter cartridge housings 131 are fixed inside the filter housing tube 13. The outer shell of the filter cartridge housing 131 is a hollow structure with the inside and outside connected. The filter cartridge housing 131 is filled with a water purification filter cartridge 132.

[0087] Water purifier filter cartridge 132 is a pleated microporous membrane filter cartridge;

[0088] like Figure 3 As shown, a vertically extending aeration container pipe 14 is fixed inside the extraction mechanism support pipe 11. The top of the aeration container pipe 14 is connected to the top of the filter container pipe 13, as shown. Figure 5 As shown, an aeration conveying shell 141 is fixed at the bottom of the aeration receiving pipe 14. The top of the aeration conveying shell 141 has an aeration conveying pipe 142 that communicates with its interior. The top of the aeration conveying shell 141 has multiple aeration nozzles 143 that communicate with its interior.

[0089] like Figure 9 As shown, the drug precipitation mechanism 20 includes multiple drug precipitation flow channels 21 with their openings facing upward and placed at an angle of 0.1 to 3° with respect to the horizontal plane.

[0090] The top of the aeration container pipe 14 is connected to the water storage tank, and the water storage tank is connected to the higher end of the chemical sedimentation and flow channel 21.

[0091] A chemical delivery pipe 22 is fixed inside the higher end of the chemical sedimentation and flow tank 21, and multiple chemical dosing nozzles 221 are provided on the back water side of the chemical delivery pipe 22.

[0092] The aeration container pipe 14 is connected to the reagent sedimentation flow tank 21;

[0093] The bottom of the reagent sedimentation flow tank 21 is fixed with a particle interception pad 231 and a particle interception plate 232.

[0094] The particle interception pad 231 is a pad made of velvet, and the particle interception plate 232 is a mesh plate with open top and bottom sides.

[0095] like Figure 10 As shown, the top of the drug sedimentation flow tank 21 is provided with a sedimentation flow tank cover plate 24. One side of the sedimentation flow tank cover plate 24 is connected to the top of the drug sedimentation flow tank 21 by multiple fixed hinges A241. The top of the sedimentation flow tank cover plate 24 is connected to a sedimentation barrier plate 243 by a fixed hinge B242. The sedimentation barrier plate 243 is a grid plate with open sides.

[0096] like Figure 11 As shown, the evaporation purification mechanism 30 includes an evaporation mechanism sealed shell 31. The top of the evaporation mechanism sealed shell 31 has a round arch structure. A conical evaporation support shell 32 is fixed inside the evaporation mechanism sealed shell 31. An evaporation input pipe 320 is fixed on the top of the conical evaporation support shell 32. The side of the conical evaporation support shell 32 has a spirally extended evaporation slow flow groove 321.

[0097] The lower end of the reagent precipitation flow tank 21 is connected to the evaporation input pipe 320;

[0098] A flow-slowing baffle ring 322 is fixed at the edge of the conical evaporation support shell 32;

[0099] An evaporation slow flow discharge pipe 323, which is connected to the evaporation slow flow groove 321, is fixed at the edge of the conical evaporation support shell 32;

[0100] An annular, upward-facing purification collection tank 33 is fixed at the bottom of the sealed shell 31 of the evaporation mechanism, and a purification discharge pipe 331 connected to the bottom of the purification collection tank 33 is fixed thereto.

[0101] The reagent precipitation flow tank 21 is connected to the evaporation input pipe 320;

[0102] like Figure 11As shown, the bottom of the conical evaporation support shell 32 is tightly fixed to the evaporation heating shell 34. The top of the evaporation heating shell 34 has a heat-absorbing coating. The evaporation heating shell 34 has a fiber optic support plate 341 fixed inside. The fiber optic support plate 341 has multiple vertical through holes 342. The fiber optic receiving tube 343 is fixed inside the through holes 342. Multiple optical fibers 344 are fixed inside the fiber optic receiving tube 343. A focusing lens group 345 is fixed at the top of the fiber optic receiving tube 343.

[0103] A condensation guide plate 311 is fixed on the inner wall of the sealed shell 31 of the evaporation mechanism. The side of the condensation guide plate 311 has multiple parallel condensation guide grooves 312.

[0104] Example 2:

[0105] The difference from Example 1 is that the water purification filter 132 is a series combination of PP filter, reverse osmosis membrane filter, pleated microporous membrane filter and ceramic filter.

[0106] Example 3:

[0107] The difference from Example 1 is that the water purification filter element 132 is a series combination of PP filter element, activated carbon filter element, manganese sand filter element and ultrafiltration membrane filter element.

[0108] Example 4:

[0109] The difference from Embodiment 1 is that the extraction drive piston 121 is driven to move by the extraction drive mechanism 15, such as... Figure 6 , Figure 7 As shown, the extraction drive mechanism 15 includes an extraction drive housing 150, a steel cable winding wheel 151 rotatably connected inside the extraction drive housing 150, an extraction steel cable 152 wound on the steel cable winding wheel 151, and the outer end of the extraction steel cable 152 fixedly connected to the extraction drive piston 121.

[0110] A worm gear drive shaft 153 is rotatably connected inside the extraction drive housing 150. A driven worm gear 154 is fixed on the worm gear drive shaft 153. A worm drive shaft 155 is rotatably connected inside the extraction drive housing 150. A driving worm 156 is fixed on the worm drive shaft 155. The driving worm 156 is meshed with the driven worm gear 154.

[0111] The worm gear drive shaft 153 is connected to the shaft of the steel cable winding wheel 151 via the transmission clutch A157. A vertically extending and hollow fan support rod 158 is fixed to the top of the extraction drive housing 150. A wind-driven blade 159 is rotatably connected to the top of the fan support rod 158. The shaft of the wind-driven blade 159 is connected to the worm gear drive shaft 155 via a gear transmission set.

[0112] Example 5:

[0113] Based on Example 4, such as Figure 1 As shown, multiple solar panels 161 are fixed on the ground, and the electrical energy generated by the solar panels 161 is stored in batteries 162, such as... Figure 6 As shown, the battery 162 is fixed inside the extraction drive housing 150, and a spare drive motor 163 is fixed inside the extraction drive housing 150. The output shaft of the spare drive motor 163 is connected to the worm gear drive shaft 155 through the transmission clutch B164.

[0114] Example 6:

[0115] Based on Example 5, such as Figure 2 As shown, the lower end of the extraction mechanism support tube 11 is equipped with an isolation and filtration mechanism 17, such as... Figure 8 As shown, the isolation and filtration mechanism 17 includes an isolation and filtration channel shell 171 fixed inside the lower end of the extraction mechanism support pipe 11 and extending along the direction of groundwater flow. The side wall of the extraction mechanism support pipe 11 has a filtration input opening 172 and a filtration output opening 173 that are respectively connected to the two ends of the isolation and filtration channel shell 171. An opening barrier filter plate 174 is fixed in both the filtration input opening 172 and the filtration output opening 173. An isolation and filtration plate 176 is connected to the top of the isolation and filtration channel shell 171 through a fixed hinge C175. The isolation and filtration plate 176 divides the interior of the isolation and filtration channel shell 171 into an isolation input chamber 1761 and an isolation output chamber 1762. The extraction input pipe 122 is connected to the isolation output chamber 1762.

[0116] The isolation filter plate 176 is obliquely installed in the isolation filter channel shell 171. An impact baffle 177 is fixed at the lower end of the isolation filter plate 176. The impact baffle 177 is supported in contact with the bottom of the isolation filter channel shell 171.

[0117] Multiple impurity impact pipes 181, each with one open end, are fixed at the bottom inside the isolation and filtration channel casing 171. These impurity impact pipes 181 extend along the direction of groundwater flow, with their open ends facing downstream. Figure 4 As shown, an impurity output pipe 182 connected to the interior is fixed on the outer side of the lower end of the extraction drive pipe 12. The impurity output pipe 182 has an impurity control valve 183 and is connected to each impurity impact pipe 181.

[0118] Example 7:

[0119] Based on Example 6, such as Figure 1 As shown, a plant purification mechanism 40 is connected to the evaporation purification mechanism 30, such as... Figure 13As shown, the plant purification mechanism 40 includes a plant purification flow channel 41 with the opening facing upward, a purification discharge pipe 331 connected to the plant purification flow channel 41, and multiple plant support plates 42 fixed inside the plant purification flow channel 41.

[0120] like Figure 14 As shown, the plant support plate 42 has multiple plant receiving notches 421 on its side, and the inner wall of the plant receiving notches 421 has a fixing plate groove 422, in which a plant fixing constraint plate 423 is slidably connected.

[0121] The plant fixing restraint plate 423 has plant fixing restraint holes 424, and the plant fixing restraint plate 423 is composed of two separate parts that are spliced ​​together along the plant fixing restraint holes 424.

[0122] The purification discharge pipe 331 is connected to the plant purification flow channel 41.

[0123] Example 8: This example describes a multi-stage in-situ treatment method for contaminated groundwater, based on the multi-stage in-situ treatment equipment for contaminated groundwater described in Example 1 above, including the following steps:

[0124] S1. Extraction and filtration:

[0125] A winch drives the extraction drive piston 121 in the extraction filtration mechanism 10 to move upward in the extraction drive tube 12. Groundwater enters the extraction drive tube 12 through the extraction input tube 122. When the extraction drive piston 121 moves to the upper dead point, it moves downward in the extraction drive tube 12 under its own weight. The groundwater in the extraction drive tube 12 is transported to the filter housing tube 13 through the extraction output tube 123 driven by the extraction drive piston 121. The groundwater flows from bottom to top in the filter housing tube 13 and passes through each filter element housing 131. The groundwater is filtered and purified by the water purification filter element 132.

[0126] After filtration, the groundwater is aerated. The filtered groundwater is discharged from the top of the filter container pipe 13 and flows into the aeration container pipe 14. An air compressor is used to transport air through the aeration delivery pipe 142 to the aeration delivery shell 141. The air in the aeration delivery shell 141 is then discharged from each aeration nozzle 143 to mix with the groundwater, thereby increasing the oxygen dissolved in the groundwater.

[0127] S2. Chemical remediation of groundwater:

[0128] Multiple chemical sedimentation units 20 are arranged in parallel. The filtered and purified groundwater is transported to each chemical sedimentation flow tank 21. The repair agent is input into the chemical delivery pipe 22 by the delivery pump. The repair agent is sprayed out from each chemical dosing nozzle 221 and mixed with the groundwater. The water flow velocity in the chemical sedimentation flow tank 21 is controlled at 0.6m / s.

[0129] At 2g / m 3 The remediation agent is added to the groundwater at a specific dosage. The remediation agent is composed of calcium polysulfide and sodium sulfide in a mass ratio of 3:2.

[0130] Under the action of the remediation agent, precipitate forms in the groundwater, and the precipitate particles settle into the particle interception plate 232 under their own weight.

[0131] S3. Evaporation purification of groundwater:

[0132] Multiple evaporation and purification units 30 are arranged in series, and the upstream evaporation slow flow discharge pipe 323 is connected to the adjacent downstream evaporation input pipe 320.

[0133] The groundwater output from the reagent precipitation flow tank 21 is then transported to the evaporation input pipe 320. The groundwater flowing out from the evaporation input pipe 320 flows from top to bottom along the evaporation slow flow tank 321. The groundwater continuously evaporates during the flow of the groundwater along the evaporation slow flow tank 321. The water vapor liquefies after encountering the inner wall of the evaporation mechanism sealed shell 31 and flows into the purification collection tank 33 along the inner wall of the evaporation mechanism sealed shell 31.

[0134] Unevaporated groundwater flows out from the lower end of the evaporation slow flow tank 321 and is then discharged through the evaporation slow flow discharge pipe 323 and then transported to the next evaporation input pipe 320. Multiple evaporation purification mechanisms 30 arranged in series continuously evaporate and purify the groundwater.

[0135] The existing sunlight converging mechanism is used to converge sunlight and transmit it to the focusing lens group 345 through the optical fiber 344. The focusing lens group 345 focuses the sunlight on the top of the evaporation heating shell 34. The photothermal energy is used to heat the evaporation heating shell 34 and indirectly heat the conical evaporation support shell 32 through heat conduction to promote the evaporation of groundwater.

[0136] Example 9:

[0137] The difference from Example 8 is that in step S2, the water flow rate in the reagent sedimentation flow tank 21 is controlled at 0.1 m / s.

[0138] Example 10:

[0139] The difference from Example 8 is that in step S2, the water flow rate in the reagent sedimentation flow tank 21 is controlled at 0.3 m / s.

[0140] Example 11:

[0141] The difference from Example 10 is that in step S2, the dosage is 4 g / m 3 The remediation agent is added to the groundwater at a specific dosage. The remediation agent is composed of calcium polysulfide, sodium sulfide, and lime in a mass ratio of 5:2:1.

[0142] Example 12:

[0143] The difference from Example 10 is that in step S2, the dosage is 6 g / m 3 The remediation agent is added to the groundwater at a specific dosage. The remediation agent is composed of lime, ferrous salt, and calcium salt in a mass ratio of 4:2:1.

[0144] Example 13:

[0145] The difference from Example 10 is that in step S2, the dosage is 8 g / m 3 The remediation agent is added to the groundwater at a specific dosage. The remediation agent is composed of sodium sulfide, lime, and ferrous salt in a mass ratio of 5:3:1.

[0146] Example 14:

[0147] The difference from Example 10 is that in step S2, the concentration is 10 g / m 3 The remediation agent is added to the groundwater at a specific dosage. The remediation agent is composed of calcium polysulfide, sodium sulfide, lime, ferrous salt, and calcium salt in a mass ratio of 6:4:3:1:1.

[0148] Example 15:

[0149] This embodiment describes a multi-stage in-situ treatment method for contaminated groundwater. Based on the multi-stage in-situ treatment equipment for contaminated groundwater in Embodiment 4 above, the difference from Embodiment 8 is that in step S1, the extraction drive mechanism 15 drives the extraction drive piston 121. When the wind force is sufficient, the wind force drives the wind-driven blade 159 to rotate. The wind-driven blade 159 drives the worm gear drive shaft 155 to rotate through the gear transmission group. The active worm 156 on the worm gear drive shaft 155 then drives the driven worm wheel 154 to rotate. The rotating shaft of the driven worm wheel 154 drives the steel cable winding wheel 151 to rotate through the transmission clutch A157. The steel cable winding wheel 151 drives the extraction drive piston 121 to move upward through the extraction steel cable 152.

[0150] During the downward movement of the lifting drive piston 121, the transmission clutch A157 is in the disengaged state. Under its own weight, the lifting drive piston 121 drives the cable winding wheel 151 to reverse through the lifting cable 152.

[0151] Example 16:

[0152] The difference from Embodiment 15 is that when the wind power is insufficient, the backup drive motor 163 drives the worm gear drive shaft 155 to rotate through the transmission clutch B164. The driving worm 156 on the worm gear drive shaft 155 then drives the driven worm wheel 154 to rotate. The shaft of the driven worm wheel 154 drives the cable winding wheel 151 to rotate through the transmission clutch A157. The cable winding wheel 151 drives the lifting drive piston 121 to move upward by lifting the cable 152.

[0153] Example 17:

[0154] This embodiment describes a multi-stage in-situ treatment method for contaminated groundwater. Based on the multi-stage in-situ treatment equipment for contaminated groundwater described in Embodiment 7 above, and building upon Embodiment 16, it further includes step S4, which utilizes plants to absorb and treat the groundwater.

[0155] The groundwater purified by evaporation is discharged through the purification discharge pipe 331 and transported into the plant purification flow channel 41. Multiple restoration plants are fixed on the plant support plate 42.

[0156] The plants used for restoration include reeds, cattails, water hyacinths, sweet flag, canna lilies, and ryegrass;

[0157] The roots of restorative plants are submerged in groundwater, and the plants absorb and purify pollutants in the groundwater.

[0158] A purification injection well 50 is drilled downstream, and the groundwater purified by phytoremediation is then reinjected into the ground through the purification injection well 50.

[0159] In practical application, the filtered groundwater is aerated in the aeration container 14 to increase the dissolved oxygen in the groundwater, which is beneficial for the naturally incorporated microorganisms in the groundwater to absorb and decompose pollutants in the groundwater. These naturally incorporated microorganisms will be inactivated in the subsequent evaporation and purification process to avoid secondary pollution of the groundwater by miscellaneous bacteria.

[0160] Groundwater discharged from the top of the aeration containment pipe 14 is temporarily stored in a water storage tank. The water level of the water storage tank allows the groundwater inside to flow naturally under gravity to the chemical sedimentation flow tank 21 of the chemical sedimentation mechanism 20. The lower end of the chemical sedimentation flow tank 21 is higher than the evaporation input pipe 320 of the first evaporation purification mechanism 30. The groundwater flows naturally under gravity without the need for additional power. The upstream evaporation slow flow discharge pipe 323 of the multiple evaporation purification mechanisms 30 arranged in series is connected to the adjacent downstream evaporation input pipe 320. According to the horizontal height, the upstream evaporation slow flow discharge pipe 323 is slightly higher than the adjacent downstream evaporation input pipe 320, so that the water can flow by itself under gravity. The groundwater discharged from each purification discharge pipe 331 also flows by itself under gravity to the plant purification flow tank 41. Finally, the groundwater purified by plant restoration is reinjected into the ground through the purification injection well 50.

[0161] The original groundwater is isolated and treated by the isolation and filtration mechanism 17 to prevent impurities in the groundwater from clogging the relevant components of the extraction drive pipe 12. The open barrier filter plate 174 is a hollow grid plate. During the flow of groundwater, it enters the interior of the isolation and filtration channel shell 171 through the filter input opening 172. The isolation and filtration plate 176 filters and intercepts the impurities in the original groundwater. The filtered water enters the isolation output chamber 1762. The extraction drive pipe 12 extracts the groundwater in the isolation output chamber 1762, and the remaining groundwater continues to flow and is discharged from the filter output opening 173.

[0162] The debris particles intercepted by the isolation filter plate 176 are periodically flushed. Specifically, the flushing control valve 183 is opened. Since the impurity impact pipe 181 is at a low horizontal position, the water in the extraction drive pipe 12 is preferentially discharged from the impurity impact pipe 181 under the drive of the extraction drive piston 121. The water flow discharged from the impurity impact pipe 181 flushes the isolation filter plate 176, and the impact force can drive the isolation filter plate 176 to deflect around the fixed hinge C175. However, since this impact force is unstable, it will cause the lower end of the isolation filter plate 176 to collide and vibrate with the bottom of the isolation filter channel shell 171. This is conducive to the debris particles on the isolation filter plate 176 falling off. Under the impact of the water flow, the debris particles are discharged from the gap between the lower end of the isolation filter plate 176 and the bottom of the isolation filter channel shell 171.

Claims

1. A multi-stage in-situ treatment device for contaminated groundwater, characterized in that, It includes an underground extraction and filtration mechanism (10), a chemical precipitation mechanism (20), an evaporation and purification mechanism (30), and a plant purification mechanism (40) installed on the ground. The extraction and filtration mechanism (10) includes an extraction mechanism support pipe (11) that extends vertically and is fixed in the soil and whose lower end is connected to groundwater; The extraction mechanism support tube (11) is fixed with a vertically extending extraction drive tube (12) and a filter receiving tube (13); An extraction drive piston (121) is slidably connected inside the extraction drive tube (12), and an extraction input tube (122) and an extraction output tube (123) that communicate with the inside are fixed on the outside of the extraction drive tube (12). The other end of the extraction output tube (123) is connected to the inside of the filter receiving tube (13), and the filter receiving tube (13) is provided with a plurality of water purification filter elements (132); The extraction mechanism support tube (11) is fixed with a vertically extending aeration container tube (14). The top of the aeration container tube (14) is connected to the top of the filter container tube (13). The bottom of the aeration container tube (14) is fixed with an aeration conveying shell (141). The top of the aeration conveying shell (141) has an aeration conveying tube (142) connected to its interior. The top of the aeration conveying shell (141) has multiple aeration nozzles (143) connected to its interior. The drug precipitation mechanism (20) includes multiple drug precipitation flow channels (21) with their openings facing upwards and placed at an angle; The drug sedimentation flow tank (21) has a drug delivery pipe (22) fixed inside the higher end, and the drug delivery pipe (22) has multiple drug dosing nozzles (221) on the back water side; The aeration container pipe (14) is connected to the reagent sedimentation flow tank (21); The evaporation purification mechanism (30) includes an evaporation mechanism sealed shell (31), a conical evaporation support shell (32) is fixed inside the evaporation mechanism sealed shell (31), an evaporation input pipe (320) is fixed at the top of the conical evaporation support shell (32), and a spirally extended evaporation slow flow groove (321) is provided on the side of the conical evaporation support shell (32). A flow-retardant baffle (322) is fixed at the edge of the conical evaporation support shell (32); An evaporation slow flow discharge pipe (323) connected to the evaporation slow flow groove (321) is fixed at the edge of the conical evaporation support shell (32); The bottom of the sealed shell (31) of the evaporation mechanism is fixed with an annular purification collection tank (33) with the opening facing upward. The bottom of the purification collection tank (33) is fixed with a purification discharge pipe (331) that communicates with its interior. The reagent precipitation flow tank (21) is connected to the evaporation input pipe (320); The plant purification mechanism (40) includes an upward-opening plant purification flow channel (41), and multiple plant support plates (42) are fixed inside the plant purification flow channel (41). The plant support plate (42) has multiple plant receiving notches (421) on its side, and the inner wall of the plant receiving notches (421) has a fixing plate groove (422), in which a plant fixing constraint plate (423) is slidably connected; The purification discharge pipe (331) is connected to the plant purification flow channel (41).

2. The multi-stage in-situ treatment equipment for polluted groundwater according to claim 1, characterized in that, The extraction drive piston (121) is driven to move by the extraction drive mechanism (15). The extraction drive mechanism (15) includes an extraction drive housing (150). A steel cable winding wheel (151) is rotatably connected inside the extraction drive housing (150). An extraction steel cable (152) is wound on the steel cable winding wheel (151). The outer end of the extraction steel cable (152) is fixedly connected to the extraction drive piston (121). A worm gear drive shaft (153) is rotatably connected inside the extraction drive housing (150). A driven worm gear (154) is fixed on the worm gear drive shaft (153). A worm drive shaft (155) is rotatably connected inside the extraction drive housing (150). A driving worm (156) is fixed on the worm drive shaft (155). The driving worm (156) meshes with the driven worm gear (154). The worm gear drive shaft (153) is connected to the shaft of the steel cable winding wheel (151) via a transmission clutch A (157). A vertically extending and hollow fan support rod (158) is fixed to the top of the extraction drive housing (150). A wind-driven blade (159) is rotatably connected to the top of the fan support rod (158). The shaft of the wind-driven blade (159) is connected to the worm gear drive shaft (155) via a gear transmission set.

3. The multi-stage in-situ treatment equipment for polluted groundwater according to claim 2, characterized in that, Multiple solar panels (161) are fixed on the ground. The electrical energy generated by the solar panels (161) is stored in a battery (162). The battery (162) is fixed inside the extraction drive housing (150). A backup drive motor (163) is fixed inside the extraction drive housing (150). The output shaft of the backup drive motor (163) is connected to the worm gear drive shaft (155) through a transmission clutch B (164).

4. The multi-stage in-situ treatment equipment for polluted groundwater according to claim 1, characterized in that, The extraction mechanism support pipe (11) is provided with an isolation and filtration mechanism (17) inside its lower end. The isolation and filtration mechanism (17) includes an isolation and filtration channel shell (171) fixed inside the lower end of the extraction mechanism support pipe (11) and extending along the direction of groundwater flow. The side wall of the extraction mechanism support pipe (11) has a filtration input opening (172) and a filtration output opening (173) respectively connected to both ends of the isolation and filtration channel shell (171). 2) An opening barrier filter plate (174) is fixed in both the filter and the filter output opening (173). The top of the inner wall of the filter channel shell (171) is connected to the filter plate (176) by a fixed hinge C (175). The filter plate (176) divides the interior of the filter channel shell (171) into an isolation input chamber (1761) and an isolation output chamber (1762). The extraction input pipe (122) is connected to the isolation output chamber (1762). The isolation filter plate (176) is obliquely disposed in the isolation filter channel shell (171), and an impact baffle plate (177) is fixed at the lower end of the isolation filter plate (176). The impact baffle plate (177) is in contact with and supported at the bottom of the isolation filter channel shell (171).

5. The multi-stage in-situ treatment equipment for polluted groundwater according to claim 1, characterized in that, The bottom of the drug precipitation flow channel (21) is fixed with a particle interception pad (231) and a particle interception plate (232).

6. The multi-stage in-situ treatment equipment for polluted groundwater according to claim 1, characterized in that, The bottom of the conical evaporation support shell (32) is tightly fixed to the evaporation heating shell (34). The top of the evaporation heating shell (34) has a heat-absorbing coating. The evaporation heating shell (34) is fixed inside the evaporation heating shell (34). The fiber support plate (341) has multiple vertical through holes (342). The fiber receiving tube (343) is fixed inside the through holes (342). Multiple optical fibers (344) are fixed inside the fiber receiving tube (343). The top of the fiber receiving tube (343) is fixed with a focusing lens group (345).

7. The multi-stage in-situ treatment equipment for polluted groundwater according to claim 1, characterized in that, The inner wall of the sealed shell (31) of the evaporation mechanism is fixed with a condensation guide plate (311), and the side of the condensation guide plate (311) has multiple parallel condensation guide grooves (312).

8. A method for multi-stage in-situ treatment of contaminated groundwater, based on the multi-stage in-situ treatment equipment for contaminated groundwater as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Extraction and filtration: The extraction drive piston (121) in the extraction filtration mechanism (10) is driven by a winch to move upward in the extraction drive tube (12). Groundwater enters the extraction drive tube (12) through the extraction input tube (122). When the extraction drive piston (121) moves to the upper dead point, it moves downward in the extraction drive tube (12) under its own weight. The groundwater in the extraction drive tube (12) is driven by the extraction drive piston (121) to descend and is transported to the filter receiving tube (13) through the extraction output tube (123). During the process of the groundwater flowing from bottom to top in the filter receiving tube (13), the groundwater is filtered and purified by the water purification filter element (132). S2. Chemical remediation of groundwater: Multiple chemical sedimentation mechanisms (20) are arranged in parallel. The filtered and purified groundwater is transported to each chemical sedimentation flow tank (21). The repair agent is input into the chemical delivery pipe (22) by the delivery pump. The repair agent is sprayed out from each chemical dosing nozzle (221) and mixed with the groundwater. The water flow velocity in the reagent sedimentation and flow tank (21) is controlled at 0.1 to 0.6 m / s; Under the action of the remediation agent, precipitate is formed in the groundwater, and the precipitate particles settle into the particle interception plate (232) under their own weight; S3. Evaporation purification of groundwater: Multiple evaporation purification units (30) are arranged in series, and the upstream evaporation slow flow discharge pipe (323) is connected to the adjacent downstream evaporation input pipe (320); The groundwater output from the reagent precipitation flow tank (21) is then transported to the evaporation input pipe (320). The groundwater flowing out from the evaporation input pipe (320) flows from top to bottom along the evaporation slow flow tank (321). The groundwater continuously evaporates during the flow along the evaporation slow flow tank (321). The water vapor liquefies after encountering the inner wall of the evaporation mechanism sealed shell (31) and flows into the purification collection tank (33) along the inner wall of the evaporation mechanism sealed shell (31). Unevaporated groundwater flows out from the lower end of the evaporation slow flow tank (321) and is discharged through the evaporation slow flow discharge pipe (323) and then transported to the next evaporation input pipe (320). The groundwater is continuously evaporated and purified by multiple evaporation purification mechanisms (30) arranged in series. S4. Utilizing plants to absorb and treat groundwater: After evaporation and purification, the groundwater is discharged through the purification discharge pipe (331) and transported into the plant purification flow channel (41). Multiple restoration plants are fixed on the plant support plate (42). The roots of restorative plants are submerged in groundwater, and the plants absorb and purify pollutants in the groundwater.

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