JP2012061431A - Apparatus and method for cleaning ground water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such problems of an apparatus for cleaning ground water, in which the ground water is brought into contact with a cleaning material with a pump disposed under the cleaning material when the cleaning material is charged in a dug well, that the maintenance is hard, and also the durability is bad because the pump is always immersed in the ground water.SOLUTION: The cleaning apparatus which cleans soil contaminated by chemical substances includes a cylindrical container that accommodates the cleaning material, a wire suspending the cylindrical container, and a vibration means to vertically move the wire. A method for cleaning the ground water is also provided using the cleaning apparatus.

Description

  The present invention relates to a purification device and a purification method for purifying groundwater contaminated with a chemical substance and purifying soil contaminated through the purification of groundwater.

  A highly soluble solvent such as an organic halogen compound is a substance frequently used in the manufacturing process of electronic devices including semiconductors. However, the use of such substances may contaminate the factory premises and the former factory location with these substances. Such pollution not only pollutes the soil of the land, but also pollutes groundwater, which is a problem of environmental pollution. Therefore, it is necessary to purify contaminated soil and groundwater.

  Several methods have been proposed for purifying contaminated soil and groundwater. Examples include a bioremediation method, a pumped water aeration method, a lime method, an iron powder method, a soil excavation and replacement method, and the like. The bioremediation method is a method for decomposing pollutants by microorganisms in the soil. Although it is cheap in terms of cost, it takes a long time for purification.

  The soil excavation and replacement method replaces the contaminated soil completely, so it can be done in a short period of time.However, the soil excavated from the contaminated area is completely excavated and replaced with unpurified soil. Is expensive.

  The lime method and the iron powder method are not methods for excavating and replacing contaminated soil, but using chemical substances and purifying more actively than relying on microorganisms. These methods utilize that iron powder exerts a catalytic action of decomposing a chloride such as trichloromethane into chlorine gas and carbon dioxide gas. More specifically, the groundwater itself and the nearby soil are purified by digging a well in the contaminated soil, bringing finely ground iron powder into contact with the groundwater flowing there, and decomposing the contaminants in the groundwater. To do.

  Patent Document 1 discloses an example of the present invention. The outline will be described with reference to FIG. 7. A well 91 is dug up to a water shielding layer 92 in a land 90 with contaminated soil. The inner wall surface 93 of the well 91 is made of a material that allows water to pass, such as sandstone. And the cylindrical container 100 which filled the ground water 95 of the aquifer 94 in a well with the purification material which mixed stainless steel powder and iron powder is sunk through the wire 102.

  A pump 101 is disposed below the cylindrical container 100, and the pump 101 feeds groundwater into the cylindrical container 100, thereby bringing the purifier and the groundwater 95 into contact with each other. The purified groundwater passes through the inner wall surface 93 of the well and spreads to the surrounding soil, and contaminated groundwater enters the well again. By installing such wells at multiple locations on contaminated land, soil and groundwater can be purified. In addition, the power supply etc. (not shown) of the pump 101 are arrange | positioned on the ground outside a well.

JP 2009-50818 A

  The above invention is effective in that groundwater is effectively brought into contact with the purification material. However, since the inner diameter of the well 91 is about 10 cm, the pump 101 disposed in the lower portion of the cylindrical container 100 can be attached only to a small object. Therefore, when the depth of the water-absorbing layer 94 above the water-impervious layer 92 of the well 91 is deep, there is a problem that purification can be performed only at a part of the depth.

  Moreover, since the pump 101 is settled in the narrow well 91, the maintenance of the pump 101 is not easy, and since it is always settled in the groundwater, there is a problem in durability of the pump 101.

  Moreover, since only the small pump 101 can be sunk, there also existed a subject that it was difficult to contact ground water with all the purification materials in the upper cylindrical container 100. FIG. This is because the flow rate does not increase so much with the small pump 101. At the same time, there is a problem that it is difficult to confirm whether or not the water flow created by the pump 101 is surely directed into the cylindrical container 100. For example, the water flow created by the pump 101 may be directed only to one side surface of the cylindrical container 100.

  Moreover, when the water flow of the pump 101 is slow, there is a possibility that the groundwater may not reach the purifier disposed above the cylindrical container 100. This is because the purification material is a small powder having a size of several hundred microns to several millimeters, and thus can be a great resistance against water flow.

  The present invention has been conceived in view of the above problems, and a purification device that makes the purification material contact the groundwater more efficiently, and that improves the ease of maintenance and the durability of the device, and purification using the purification device A method is provided.

Specifically, the purifying device of the present invention comprises:
A purification device for purifying soil contaminated with chemical substances,
A cylindrical container containing a purification material;
A wire for suspending the cylindrical container;
It has a vibration means for moving the wire up and down.

Moreover, the purification method of the present invention comprises:
A step of digging a well, a step of lowering a cylindrical container containing a purification material to a set position in the well by a vibrating means provided on the ground, and a wire in the groundwater in the well by the vibrating means It has the process of vibrating the said cylindrical container and the said purification material up and down through this.

  In the purification apparatus or the purification method of the present invention, the purification material is purified by causing the purification material to swing in the vertical direction in the groundwater to bring the groundwater into contact with the purification material. Therefore, all the drive parts other than the purification material can be arranged outside the well on the ground, and the maintenance becomes easy.

  Moreover, since the electric drive part is not immersed in groundwater, it is hard to produce a failure and is excellent in durability. Moreover, by allowing the purification material to fall freely in the groundwater, the purification material can be agitated during the purification operation, and the groundwater and the purification material can be effectively brought into contact with each other.

  Moreover, since the purification material is vibrated up and down in the groundwater, there is no bias in the flow path passing through the cylindrical container.

The figure which shows the structure of the purification apparatus of this invention. The figure which shows an example of the vibration means of this invention. The figure which shows the structure of the cylindrical container of this invention. The figure which illustrates the modification of a cylindrical container. The flowchart which illustrates the processing flow of the control apparatus of this invention. The flowchart which illustrates the deformation | transformation of the processing flow of this invention. The figure which shows the conventional purification apparatus of groundwater.

  The purification device of the present invention will be described below with reference to the drawings. The following description exemplifies an embodiment of the present invention, and is not limited to the following description. Therefore, it may be changed without departing from the gist of the present invention.

  FIG. 1 is a diagram showing an overall configuration when the purification apparatus of the present invention is used. The purification apparatus 1 of the present invention includes a cylindrical container 2 filled with a purification material, a purification material filled into the cylindrical container 2, and a vibrating means 3 that vibrates the cylindrical container 2 up and down.

  In the purification method of the present invention, a well 91 is first dug in a land 90 to be purified. Although the size of the well 91 is not particularly limited, it is preferable that the bottom of the well 91 reaches the water shielding layer 92. In consideration of digging a well of about several tens of meters, the diameter of the well 91 is not more than several tens of millimeters. There is no strength of the drilling pipe. Further, the inner wall surface 93 of the well 91 is preferably formed of a water-permeable reinforcing material. This is to prevent the well 91 from collapsing and not to disturb the flow of groundwater.

  Next, the vibration means 3 is installed at the entrance of the well 91. In the present invention, all drive parts and control parts other than the cylindrical container 2 filled with the purifying material are on the ground. Since these devices are installed over several days to several weeks, a hut may be installed so as to surround the vibration means 3 so as not to be exposed to wind and rain.

  The cylindrical container 2 filled with the purification material is connected to the vibration means 3 through the wire 4 and is suspended in the well 91. The cylindrical container 2 is vibrated up and down while being immersed in the groundwater 95 in the well 91. The contaminated groundwater is purified by the purification material in the cylindrical container 2 that vibrates up and down contacting the groundwater.

  Next, the vibration means 3 will be described in detail with reference to FIG. The vibration means 3 of the present invention includes a wire 4 for suspending the cylindrical container 2, a winding shaft 10 around which the wire 4 is wound, a large-diameter gear 11 on which the winding shaft 10 is fixed as a rotation shaft, A small-diameter gear 12 engaged with the diameter gear 11, a variable speed motor 13 having a drive shaft fixed to the rotation center of the small-diameter gear 12 (hereinafter also simply referred to as “motor”), a power source 14 for supplying electric power to the motor 13, and a motor 13 and a control device 20 that controls the rotational speed of 13.

  The wire 4 that suspends the cylindrical container 2 is preferably one that is strong in tension and has corrosion resistance. This is because the cylindrical container 2 repeatedly moves up and down while being immersed in the contaminated ground water for several days to several weeks.

  The winding shaft 10 that winds up the wire 4 repeats the rotating motion of winding up or feeding the wire 4 in the vicinity of the central portion of the shaft, with both ends being rotatably supported. Therefore, it is necessary to have sufficient bending stress and wear resistance. This is because the winding shaft 10 is easily worn because the wire 4 is wound or unwound at the same position. In order to fix the wire 4, the winding shaft 10 may be formed with a through hole in the diametrical direction in the vicinity of the center portion or a protrusion protruding in the vertical direction from the side surface of the winding shaft 10.

  It should be noted that it is desirable that a monitor roller 15 and a counter 16 are installed at the feeding portion of the wire 4 in order to know the length of the wire that has been fed (or wound up). This is because the winding radius of the wire 4 changes as the wire 4 is wound around the winding shaft 10, so that the length of the wire 4 that is fed out cannot be measured accurately only by the number of rotations of the winding shaft 10.

  A large-diameter gear 11 with the winding shaft 10 fixed as a rotation shaft and a small-diameter gear 12 that engages with the large-diameter gear 11 are gears for securing winding torque and for reducing speed. Therefore, the ratio of the number of gears (gear ratio) may be determined as appropriate depending on the conditions of the motor 13 used.

  As the motor 13 having the drive shaft 13a fixed at the rotation center of the small-diameter gear 12, a stepping motor capable of controlling a sufficient torque, rotation direction, and rotation speed can be suitably used. In the purification apparatus 1 of the present invention, the cylindrical container 2 filled with the purification material is subjected to amplitude movement up and down, and the feature is that the amplitude, amplitude center depth, and amplitude speed can be changed. This is because there is one.

  The power supply 14 to the variable speed motor 13 and the control device 20 for controlling the variable speed motor 13 are not particularly limited. The power source 14 may be a self-generated power source. The control device 20 preferably uses an MPU (Micro Processor Unit) and a memory. This is because the purification device 1 according to the present invention allows several combinations of parameters to move the cylindrical container 2 up and down. Further, the control device 20 can obtain the torque information St from the motor 13 and the rotation speed information Sc of the monitor roller set in the wire feeding portion.

  The monitor roller 15 includes three rollers that are sandwiched so as to sandwich the wire 4, and is supported so as to be movable in a direction perpendicular to the feeding direction of the wire 4. This is because, since the wire 4 is wound around the center of the winding shaft 10 with a predetermined width, the feeding position of the wire 4 is moved by feeding (or winding). The counter 16 counts the rotation of at least one of the monitor rollers 15 and notifies the control device 20 of the rotation. The rotation speed information Sc from the monitor roller 15 can know the length of the wire 4 that has been fed out (or wound up), and can know the speed of feeding (or winding up) by a timer that the control device 20 has inside. I can do it.

  As shown in FIG. 2, in order to deal with inconveniences such as positional deviation of the wire 4 and contact deterioration between the wire 4 and the monitor rotor 15, an infrared light receiving and emitting is used instead of the contact type monitor rotor 15 and counter 16. Alternatively, known non-contact type detection units 15a and 16a using magnetic force detection may be used. For example, when reference numeral 16a is an infrared light emitting / receiving device, reference numeral 15a is a reflecting mirror or the like. Moreover, when the code | symbol 16a is used as the magnetic force detection apparatus, the code | symbol 15a is a magnet.

  In the detection unit, reference numeral 15a is fixed to a flange 10b extending on the winding shaft 10. Each time the winding shaft 10 rotates, the detection unit 16a detects the rotation and notifies the control device 20 as rotation information Sc. Therefore, it is desirable to equip either the monitor rotor 15 and the counter 16 or the detection units 15a and 16a.

  Next, the structure of the vibration means 3 using these will be described. The frame 30 is installed so as to surround the hole of the excavated well 91 and fixed with a bolt 35 or the like. Support struts 31a and 31b are formed on the frame 30 so as to straddle the holes of the well 91, and bearings 32a and 32b are fixed to the support struts 31a and 31b. A shaft 10a of the winding shaft 10 is inserted through the bearings 32a and 32b and is rotatably supported. One end of the winding shaft 10 extends from the support columns 31a and 31b to the outside of the well 91, and the large-diameter gear 11 is fixed to the end. A small diameter gear 12 is engaged with the large diameter gear 11. The rotation shaft of the small-diameter gear 12 is fixed to the drive shaft 13 a of the variable speed motor 13, and the variable speed motor 13 is fixed to the frame 30. The variable speed motor 13 is connected to power supply lines 14 a and 14 b from the power supply 14 and a control line 21 from the control device 20. The operation of the vibration means 3 will be described later.

  Needless to say, the vibration means 3 is not limited to the above-described configuration as long as it can be vibrated up and down in the well 91 excavated from the cylindrical container 2 filled with the purifying material.

  Next, the detail of the cylindrical container 2 is demonstrated with reference to FIG. The cylindrical container 2 has a shape that has substantially the same cross-sectional shape along the axis 49 in the height direction. Therefore, the cross section perpendicular to the axis 49 is not limited to a perfect circle, and may be a polygon or an ellipse. The outer surface 40 is made of a highly corrosion-resistant material such as stainless steel, and a through passage 41 extending from the upper part to the lower part is formed near the center of the cross section. This is to secure a flow path for flowing groundwater from above to below or from below to above.

  A space is secured from the inner wall surface 40 a of the outer surface 40 in the direction of the axis 49 of the cylindrical container 2, and a partition 42 is formed at the boundary near the axis 49. That is, the outer container portion 43 is formed on the inner wall surface 40 a side of the outer surface 40 of the cylindrical container 2. It is desirable that the partition 42 has water permeability. This is because the groundwater flowing in the vicinity of the center of the cylindrical container 2 flows well into the outer container part 43. Further, a partition 43 a may be provided in the outer container portion 43 also in a direction perpendicular to the shaft 49 of the cylindrical container 2. This is because the inside of the outer container portion 43 is divided into a plurality of sections.

  In particular, it is preferable that the upper and lower end surfaces 40b, 40c of the cylindrical container 2 are formed entirely by water-permeable partitions 43b, 43c. This is to prevent the purification material from spilling from the outer container portion 43 and falling off the cylindrical container 2. In addition, although the partition 43c is not mesh-shaped in FIG. 3, a mesh-shaped partition may be sufficient.

  A connecting ring 44 for connecting the wire 4 is formed on the outer surface 40 at the top of the cylindrical container 2. A plurality of connection rings 44 may be provided around the outer surface 40. Wires are connected to the respective connection rings 44 and the tubular containers 2 are suspended as the wires 4 by combining them.

  Further, the pulling ring 45 may be formed so as to straddle the diameter of the upper end portion of the cylindrical container 2. This is because if the wire 4 is cut and the cylindrical container 2 falls to the bottom of the well 91, it can be pulled up from the top with a tow rod.

  In FIG. 4, the top view of the modification of the cylindrical container 2 is shown. In Fig.4 (a), the cylindrical container 2a which has the through-passage 41a which is not circular is shown. Since the through channel 41a is a channel for groundwater, it only needs to be formed substantially parallel to the vertical direction of the cylindrical container 2a, and the cross-sectional shape may not be circular. In the figure, the case where the cross section is a square is shown, but other polygons and ellipses may be used.

  FIG. 4B shows an example in which a nose cone 46 is arranged in the through passage 41. The nose cone 46 plays a role of flowing groundwater flowing through the through passage 41 to the outer container portion 43. For example, when groundwater flows from below to above (60), the groundwater 60 strikes the purifier 58 filled in the lower portion of the cylindrical container 2, but the groundwater 60 flows into the central through passage 41 due to flow resistance. (61). Therefore, the nose cone 46 is arranged at substantially the center of the through-passage 41 of the cylindrical container 2 and flows into the outer container part 43 again (62). In addition, the code | symbol 58 is a bag of the nonwoven fabric filled with the purification material.

  In addition, referring to FIG. 4C, the container portion for filling the purification material may be formed near the center of the cylindrical container 2, and in this case, the central container portion 47 is added to the outer container portion 43. It is formed. The through passage 41 c is formed between the outer container part 43 and the central container part 47.

  Moreover, with reference to FIG.4 (d), the taper-shaped cover part 50 may be arrange | positioned at the lower end part of the cylindrical container 2, and the flap 51 may be arrange | positioned at the upper end part. In this case, the lid 50 is opened and the purifier is filled from the direction of the lid 50. The tapered lid portion 50 serves to reduce water resistance when the cylindrical container 2 is lowered and to increase the flow rate of groundwater flowing through the through passage 41. On the other hand, the flap 51 at the upper end is connected to the outer surface 40 of the cylindrical container 2 by a hinge (not shown). Therefore, when the cylindrical container 2 descends, it is positioned along the outer surface 40 and does not become flow resistance. Moreover, when the cylindrical container 2 is pulled up, it opens to a predetermined angle and works so that a large amount of groundwater flows into the cylindrical container 2.

  The purification material has a size of several hundred microns to several millimeters, and iron, stainless steel, and silicon sludge are preferably used. These purification materials may be filled in the cylindrical container 2 as they are. Moreover, you may pack in the sachet unit of cloth or a nonwoven fabric. This is because handling and replacement are convenient. In addition, when the purifying material is packed in a small bag unit, a hole through which groundwater leaks may be formed on the outer surface 40. This is because the granular purification material is less likely to be detached from the cylindrical container 2.

  Next, the operation of the groundwater purification apparatus 1 of the present invention will be described. As already explained, a well 91 extending to the water shielding layer 92 is excavated in the soil to be purified. The frame 30 is disposed on the hole of the well 91, and the gears (11, 12) and the motor 13 are disposed. The cylindrical container 2 is packed with a purification material in a small bag unit, and is arranged in an outer container part 43 divided into compartments in the cylindrical container 2. In addition, it is assumed that the depth to the bottom of the well 91 and the depth from the well hole to the groundwater surface are measured in advance.

  The operation of the purification device 1 of the present invention will be described with reference to the block diagram of the vibration means in FIG. 2 and the flow in FIG. When the cylindrical container 2 is put in the well and the control device 20 is started, the operation is started (S100). When the operation is started, the cylindrical container 2 is lowered to the set depth (D0) (S102). Next, amplitude motion is performed with the set amplitude A0 and amplitude velocity V0 (S104).

  At this time, the control device 20 determines the actual movement (amplitude A0 and amplitude velocity V0) of the cylindrical container 2 by the information Sc such as the feeding length of the wire 4 from the counter 16 and the timer that the control device 20 has. know. Further, in order to perform the actual movement according to the set value, the motor 13 is instructed by a command Cm such as the rotation amount, rotation direction, and rotation speed of the drive shaft.

  This exercise is continued until the set operation time has elapsed. In step S106, the elapsed time (t) is compared with a preset time (Tset), and if it is within the set time (N branch of S106), it is vibrated again (return to S104). When the set operation time ends (Y branch of S106), the cylindrical container 2 is rolled up (S108) and stopped (S110). Of course, the operation may be stopped when an interruption process such as pressing the operation stop switch is performed.

  Moreover, since the control apparatus 20 receives the information St regarding the torque from the motor 13, it can grasp | ascertain the cutting | disconnection of the wire 4 by seeing this torque. This is because the load on the motor 13 suddenly disappears. In that case, you may notify the cutting | disconnection of the wire 4 with the monitor screen of the control apparatus 20, or a speaker.

  At this time, the drop speed Vd and the pulling speed Vu may be changed. In particular, when the cylindrical container 2 is lowered, it is preferable to feed the wire 4 at a speed equal to or higher than the dropping speed in water. When the wire 4 is fed out at a speed equal to or higher than the free fall speed in water, the cylindrical container 2 falls freely in water. Here, the free fall in water means the speed at which the cylindrical container 2 falls in the well due to the resistance of water. Then, the purifying material in the cylindrical container 2 becomes a weightless state, and a gap is easily formed between the purifying materials, thereby making it easier to contact with the groundwater. In addition, the purifying material can be agitated and changed in position for each vibration motion. This makes the fresher surface easier to contact with groundwater.

  As described above, in the present invention, since the cylindrical container 2 filled with the purifying material is oscillated up and down in the well 91, the flow path of the water flow is not biased. Purification activity is guaranteed.

  Basically, the purifying apparatus 1 of the present invention is basically operated as described above, but the center point of the amplitude, the vibration width, and the vibration speed may be changed for each operation time. FIG. 6 illustrates such an operation flow. When the operation starts (S200), the cylindrical container 2 is lowered into the well to a predetermined depth (D0) (S202). When reaching the predetermined depth D0, vibration is started at the initial amplitude A0 and vibration speed V0 (S204). Next, when a predetermined time has elapsed (Y branch of S206), the cylindrical container is lowered to the next depth (D1) (S208), and then vibration is started at the set amplitude A1 and vibration speed V1 (S210). At this time, the first amplitude A0 and vibration speed V0 may not be the same as the second amplitude A1 and vibration speed V1.

  As shown in FIG. 6, the process flow described above shows two steps of installing at a predetermined depth and vibrating at a predetermined amplitude and a predetermined vibration speed. The first step (P1) and the next step (P2) are not limited to these two, and may be selected any number of times, and parameters such as depth, amplitude, and vibration speed for each step may be selected for each step. You can choose to. That is, parameters such as amplitude and vibration speed may be changed for each set depth serving as the vibration center.

  Since the present invention can change the depth of the cylindrical container in the well from the outside of the well, such a variation of operation is possible. Therefore, it is possible to vibrate finely and quickly in an area shallow from the groundwater surface where the water pressure is low, and relatively slowly vibrate with a large amplitude in an area near the bottom of the well where the water pressure is high.

  In the purification apparatus of the present invention, since the vibration means for controlling the raising and lowering of the cylindrical container are all on the ground outside the well, even when the vibration means fails, it is not necessary to lift the cylindrical container, and repair and response can be performed. Is possible. Even if the wire is broken, the operator can be notified by monitoring the torque of the variable speed motor. Moreover, when the pulling ring is provided in the upper part of a cylindrical container, a cylindrical container can be collect | recovered easily by lowering | hanging a pulling rod in a well.

  The purification apparatus and method of the present invention can be suitably used for purification of soil and groundwater.

DESCRIPTION OF SYMBOLS 1 Purification apparatus 2 Cylindrical container 3 Vibrating means 4 Wire 10 Winding shaft 10a Shaft 10b Flange 11 Large diameter gear 12 Small diameter gear 13 Variable speed motor 14 Power supply 15 Monitor roller 16 Counter 15a, 16a Detection unit 20 Control apparatus 30 Frame 31a, 31b Support column 32a, 32b Bearing 40 Outer surface 40a Inner wall surface 41 Through passage 42 Partition 43 Outer container portion 43a Outer container portion inner partition 43b Upper end portion partition 43c Lower end portion partition 44 Connection ring 45 Pull ring 46 Nose cone 49 Shaft 58 Purifier bag 60 Groundwater 90 Land to be purified 91 Well 92 Impervious layer 93 Wall surface of well

Claims (16)

A purification device for purifying soil contaminated with chemical substances,
A cylindrical container containing a purification material;
A wire for suspending the cylindrical container;
A purification device having a vibrating means for moving the wire up and down.   The said cylindrical container is a purification apparatus of groundwater described in Claim 1 which has the penetration path penetrated up and down where the said purification | cleaning material is not accommodated.   The cylindrical container includes a central container part containing a purification material at a center position in plan view, an annular outer container part containing a purification material surrounding the central container part, and a space between the central container part and the outer container part. The purification apparatus according to claim 2, comprising a through passage formed in the inner wall.   The said cylindrical container is a purification apparatus of Claim 2 which consists of the cyclic | annular outer container part which accommodated the purification material, and the through-passage located in the center of the said outer container part.   2. The groundwater purification apparatus according to claim 1, wherein the vibration means includes a winding shaft rotatably provided around a horizontal axis, and a variable speed motor that reciprocally rotates the winding shaft.   The apparatus for purifying groundwater according to any one of claims 1 to 6, wherein silicon sludge containing Si as a main component is accommodated as a purifying material.   The apparatus for purifying groundwater according to any one of claims 1 to 6, wherein the cylindrical container is provided with an opening capable of removing and purifying the purification material, and the lid has a detachable lid.   The groundwater purification apparatus according to claim 7, wherein the lid has a tapered shape.   The purifier according to any one of claims 1 to 8, wherein a pulling ring is formed on an upper portion of the cylindrical container.   The purifying apparatus according to any one of claims 5 to 9, wherein the vibration means is connected to the variable speed motor and a counter that reads rotation information of a monitor roller that rotates in contact with the wire.   11. The purifying apparatus according to claim 10, wherein the vibration means feeds the wire at a speed faster than a free fall speed in the ground water when the cylindrical container is lowered. The process of digging a well;
A step of lowering the cylindrical container containing the purification material by a vibrating means provided on the ground to the set position in the well with a wire;
A method for purifying groundwater, comprising the step of vibrating the cylindrical container and the purification material up and down through the wire in the groundwater in the well by the vibration means.   The purification method according to claim 12, wherein a center point of the vibration is fixed.   The purification method according to claim 12 or 13, wherein, in the step of vibrating, when the purification material is lowered, the purification material is lowered at a free fall speed in the groundwater.   The purification method according to claim 11, further comprising a step of changing a center of the vibration.   The purification method according to claim 15, wherein an amplitude and a vibration speed of the upper and lower vibrations are changed for each step of changing the center of the vibration.