KR101135152B1 - Purifier integrated bioleaching and electrokinetic remediation for purification of heavy metal contaminated soil - Google Patents

Abstract

Disclosed is a purifier for purifying soil contaminated with heavy metals. The contaminated soil purification device is disposed in the soil and configured to introduce microbial fluid or electrolyte solution into the body. First, in the microbial treatment step, the microbial fluid is introduced into the body to treat the contaminated soil through microbial reaction. After the electrokinetic treatment step, the electrolyte solution is introduced into the body again to purify the contaminated soil through the electrode reaction.

Description

Purifier integrated bioleaching and electrokinetic remediation for purification of heavy metal contaminated soil}

The present invention relates to a purification apparatus for purifying soil contaminated with harmful heavy metals, and more particularly, to an integrated purification apparatus for simultaneously applying biodissolution microorganism technology and electrokinetic technology, two different underground treatment methods.

In recent years, heavy metal soil contamination has become a social problem in the vicinity of abandoned mines, industrial facilities, military units, and shooting ranges. As such, if the soil is contaminated with heavy metals, it is difficult to restore the soil and causes various problems that directly damage not only crops but also humans.

Accordingly, the interest of society and the government's efforts to restore it are increasing, and the development of heavy metal-contaminated soil remediation methods suitable for the topography, climate and environment of Korea is also actively underway.

The heavy metal contaminated soil purification method as described above has been preferred as a soil washing technology as an ex-situ technology. Such out-of-ground treatment technology has a disadvantage of undergoing various treatment processes such as landfilling or incineration after excavation and treatment, and it is evaluated that economic aspects are inefficient for large sites.

Meanwhile, the heavy metal contaminated soil purification method includes in-situ technologies such as electrokinetic soil treatment technology and biological treatment technology in addition to out-of-ground treatment technology. This underground treatment technology has an economic advantage compared to the out-of-ground treatment technology has been continuously studied.

 At this time, the electrokinetic treatment technology is the technology that can be most effectively applied to the removal of heavy metals, it is possible to efficiently control the movement of heavy metals in the soil layer through the control of the formation and strength of the electric field.

However, the electrokinetic treatment technique depends on the presence of the initial heavy metals present in the contaminated soil, and heavy metals present in the form of sulfide organic bonds and iron manganese (water) oxide bonds with relatively high bonding strength can be expected to be efficiently removed. none.

In addition, bioelution, which is one of biological treatment technologies, is a technology that utilizes specific microorganisms to dissolve and elute heavy metals (compounds) in a low mobility form. This biological treatment technology has the advantage of being environmentally friendly because it is not excessive chemical input. However, bio-dissolution technology is inadequate when applied to soils with low permeability, because micro-organisms and nutrients required for microbial activity must be injected into the soil, and it is necessary to recover the eluted heavy metals from the soil and to prevent the diffusion of the eluted heavy metals into the soil. Additional equipment or equipment is required.

That is, although the conventional techniques for purifying heavy metal-contaminated soils have been completed, there is a limit to the application of unit technologies such as electrokinetic or biological treatment techniques due to the complexity of the soil medium.

In addition, there is a problem in that it is difficult to expect economic feasibility because the process, such as the configuration, installation, operation of the device for each unit technology for cleaning the soil contaminated with heavy metal is different.

Accordingly, the present invention has been made to solve the above object, and an object of the present invention is to provide an integrated purification device that combines the advantages of each unit technology to overcome the limitations of the unit technology for the efficient purification of contaminated soil.

The apparatus for purifying heavy metal-contaminated soil according to the present invention includes a body, an upper support screwed to the body, an electrode rod inserted into the body through the upper support, and connected to the upper support of the body. It includes an inlet pipe for introducing a microbial fluid or an electrolyte solution therein, and an outlet pipe connected to the upper support to outflow the electrolyte solution inside the body.

The purification device is a first purification device that serves as an anode to inject the microbial fluid in the bio-eluting microorganism processing technology and the electrolyte solution in the electrokinetic processing technology, and extract to extract the microbial liquid in the bio-eluting microbial processing technology In the tablet and electrokinetic processing technology, the electrolyte solution is introduced to include a second purifying device serving as a negative electrode portion.

The inlet pipe is branched to the microbial fluid source and the electrolyte solution source, respectively,

On the inlet pipe is provided a valve and a first pump for selectively supplying the fluid from the microbial fluid source or the electrolyte solution source to the body.

The upper support is provided with a water level sensor for detecting the level of the fluid flowing into the body.

A second pump is installed on the outlet pipe to allow the fluid inside the body to flow out according to the result detected by the water level sensor.

The water level sensor, the first pump and the second pump is electrically connected to the control unit,

The controller controls the operation of the first pump and the second pump according to the result detected by the water level sensor.

The body has a slot is formed so that the microbial or electrolyte solution can move into and out of the body,

On the outside of the body is provided a filter bag to prevent the inflow of foreign matter into the interior of the body and to allow the microbial or electrolyte solution to move through the slot.

The upper support is provided with a gas outlet for smooth discharge of oxygen and hydrogen gas generated by the electrode reaction.

The body of the purifier is equipped with a connection pipe connecting with the body of the adjacent purifier.

The body of the purification device includes an inner body, and an outer body disposed on the outside of the inner body,

First, a clay soil obtained by kneading kaolinite or bentonite at a ratio of 2: 1 to water is filled in the outer body, and the inner body is inserted into the outer body so that the clay body is filled with clay soil. do.

The lower end of the inner body is made of a tip has a structure that is easy to insert the inner body into the outer body.

The connecting pipe is mounted on the inner body of the first purifying device to adjust the level of the adjacent first purifying device at the same time only by adjusting the level of one first purifying device.

The apparatus for purifying contaminated soil according to the present invention described above can simultaneously apply bio-dissolution microorganism treatment technology and electrokinetic treatment technology, thereby overcoming the limitations of unit technology and increasing efficiency when purifying soil contaminated with heavy metals. It has an effect.

1 is a view schematically showing an apparatus for purifying soil contaminated with heavy metals according to the present invention.
FIG. 2 is an exploded perspective view showing a part of the purification device shown in FIG. 1.
3 is a cross-sectional view of the purification device shown in FIG.
4 is a view showing a control relationship of the water level sensor shown in FIG.
Figure 5 is an exploded perspective view showing another embodiment of the apparatus for purifying soil contaminated with heavy metals according to the present invention.
FIG. 6 is a perspective view of the purification apparatus illustrated in FIG. 5.
FIG. 7 is an exploded perspective view of the purification apparatus illustrated in FIG. 5.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

One embodiment of the apparatus for purifying heavy metal contaminated soil according to the present invention is disposed in a plurality of heavy metal contaminated soil, as shown in Figures 1 to 3, arranged in a specific arrangement and intervals. The purifier is largely composed of an upper support 10, a body 20, and a lower support 30.

The upper support 10 and the lower support 30 are screwed to the upper and lower portions of the body 20, respectively, the upper support 10 is exposed to the outside of the soil as shown, the body 20 and the lower support 30 is placed in contaminated soil.

First, the upper support 10 is connected to the inflow passage 50 for supplying the microbial or electrolyte solution to the interior of the body 20, as shown through the upper support 10 of the body 20 It is inserted inside.

The inflow passage 50 is branched to the microbial fluid supply source 51 and the electrolyte solution supply source 52. On the inflow passage 50, a valve 53 is installed to selectively supply the microbial fluid or the electrolyte solution from the microbial fluid supply source 51 and the electrolyte solution supply source 52. In addition, the first pump 54 is installed on the inflow passage 50 and serves to supply the microbial fluid or the electrolyte solution to the inside of the body 20 as the valve 53 is opened and closed.

In addition, the electrode rod 60 is inserted into the body 20 so that the electrode rod 60 is detachably attached to the center of the upper surface of the upper supporter 10 by the electrode connecting socket 61. The electrode 60 is supplied with power of the positive electrode or the negative electrode from the power supply device 63, preferably made of a material coated with iridium on the titanium rod. In this case, the power supply device 63 may change the polarity of the power applied to the electrode rod 60 of each purification device and supply the changed power.

At this time, in the present invention, the purification device receiving the power of the anode and the purification device receiving the power of the cathode are sequentially disposed with the contaminated soil in between. In addition, heavy metals present in soil contaminated by the application of power are mainly introduced into the purification device of the cathode by electrode reactions such as electrophoresis, electrophoresis, and electroosmotic phenomenon. The contaminated soil is purged by introducing into the purifier or the catholyte solution into the purifier of the anode.

In addition, the upper support 10 is connected to the outlet flow path 70 for flowing out the fluid, that is, the electrolyte solution into the interior of the body 20 is inserted into the body 20. The outflow passage 70 serves to drain the electrolyte solution of a predetermined level or more flowing into the body 20 or to drain the electrolyte solution, that is, the waste solution of the negative electrode containing a heavy metal. To this end, the second pump 74 is connected to the outflow passage 70 to drain the electrolyte solution inside the body 20.

In addition, the upper support 10 is installed inside the body 20 through the water level sensor 80 for detecting the level of the fluid flowing into the body 20, that is, the electrolyte solution. The water level sensor 80 is preferably made of acid-resistant stainless steel.

At this time, the water level sensor 80 detects the level of the electrolyte solution flowing into the body 20 as shown in Figure 4 and delivers the result to the control unit 90, the control unit 90 level sensor The first pump 54 and the second pump 74 are controlled according to the result transmitted from the 80. That is, the first pump 54 installed on the inflow passage 50 and the second pump 74 installed on the outlet passage 70 are operated according to the level of the fluid sensed by the water level sensor 80. .

For example, in the present invention, the proper level of the electrolyte solution introduced into the body 20 may be 1.6m, the minimum level is 1.5m, and the highest level is 1.7m.

In this case, when the level of the electrolyte solution introduced into the purification device to which the negative electrode is applied is reduced to 1 m, the first pump 54 installed on the inflow channel 50 is operated to supply the inflow channel 50 from the electrolyte solution source 52. The electrolyte solution is introduced into the inside of the body 20 through).

In addition, when the level of the electrolyte solution introduced into the purification device to which the anode power is applied increases to 1.7 m, the second pump 74 connected to the outflow passage 70 operates to drain the electrolyte solution and the level of the electrolyte solution is increased. As soon as 1.5 m is reached, the operation of the second pump 74 is stopped.

Referring back to FIGS. 1 to 3, one side of the upper support 10 has a gas outlet 13 for smooth discharge of oxygen and hydrogen gas generated by the electrode reaction generated when the power supply to the electrode 60 is applied. Is formed.

The body 20 is screwed with the upper support 10 as described above, it is preferable that the body is kept airtight from the outside air to enable pressurization and pressure reduction for the inflow and outflow of the fluid into the body.

In addition, the outer surface of the body 20 can be moved to the soil of the microorganisms contaminated or through the soil contaminated with the electrolyte solution to the body of the other purification device, the slot so that the moved heavy metal flows into the body 20 21 is formed.

In addition, the outer side of the body 20 is provided with a filter bag 40 for filtering the foreign matter in the soil through the slot 21 and at the same time passing through the microorganism and the microbial fluid or electrolyte solution. This filter bag 40 has a suitable pore size (for example, air permeability of 2.0 cm 3 / cm 2 / sec) to filter foreign matter in the soil and to pass the microbial or electrolyte solution as described above. In addition, the filter bag 40 is made of a polypropylene material, resistant to acids and alkalinity, is provided to be usable below 100 ℃.

The lower support 30 is screwed to the body 20 as described above, and serves to prevent the microbial or electrolyte solution introduced into the body 20 from being discharged to the outside by gravity.

Hereinafter, the operation of the apparatus for purifying soil contaminated with heavy metals of the present invention will be described in detail.

Purification device of the present invention first performs a bio-eluting microorganism purification technology to elute the heavy metals. At this time, the process of eluting heavy metals by applying the bio-dissolution microorganism purification technology as described above uses at least two or more purification devices, at least one purification device is used as an injection well into which the microbial fluid is injected at least one other purification device Is used as an extraction well from which microbial fluid is extracted.

Looking at the above process sequence, first, the inlet flow path 50 connected to the microbial fluid supply source 51 is opened through the valve 53 installed on the inlet flow path 50 of the purification device. Then, the first pump 54 is operated while the inflow passage 50 connected to the microbial fluid supply source 51 is opened, and the microbial fluid stored in the microbial fluid supply source 51 is internal to the body 20 of each purification device. Inflow to

At this time, the microbial fluid introduced into the body 20 flows out through the slot 21 formed in the body 20 and passes through the filter bag 40 to be contaminated with soil.

The following two methods are selectively used as a method for transferring and diffusing the microbial fluid introduced within the contaminated soil for the purpose of purification.

The first is to increase the pressure when the microbial fluid is introduced into the body 20 to move the microorganism by the pressure difference in the soil.

Secondly, in the case of low permeability soil layer where it is difficult to expect the microbes to move smoothly due to pressure difference, electricity is supplied to the anode and cathode arranged sequentially, such as electroosmotic, electrophoretic, electrophoretic phenomenon. The electrode reaction allows microorganisms to migrate and spread within the contaminated soil.

As described above, the microbial fluid introduced into the soil uses indigenous microorganisms or artificially cultured heavy metal eluting microorganisms (iron oxide or sulfated microorganisms), and dissolves and elutes heavy metals (compounds) in a low mobility.

In the above process, the microbial fluid inside the body 20 passes through the filter bag 40 as described above, and the filter bag 40 has an appropriate pore size to filter foreign substances contained in the soil and the microbial fluid. Can be easily passed.

In addition, a purification device installed adjacent to the purification device used as an injection well is used as an extraction well from which the microbial fluid is extracted.

Thereafter, after the microbial fluid is injected into the soil, by applying the electrokinetic treatment technology to move the eluted heavy metal to the cathode by applying the bio-dissolution microbial purification technology, the moved heavy metal contaminants are the flow path of the body 20 ( 70) to remove it from the soil.

In the above process, the purification device used as the injection well in the biodissolution microorganism purification technology is used as the anode portion to receive the power of the positive electrode, the purification device used as the extraction well is used as the cathode portion to receive the power of the cathode.

In detail, the inflow passage 50 connected to the electrolyte solution source 52 is opened using the valve 53 installed on the inflow passage 50 of each purification apparatus used as the anode and cathode portions. Then, the first pump 54 is operated to supply the electrolyte solution into the body 20 of each purifier.

After the electrolyte solution is supplied into the body 20 of each purifier, the positive or negative power is applied to the electrode 60 of each purifier. In this way, when the positive or negative power is applied to the electrode of each purification device, the electrolyte solution flowing into the body 20 of the purification device applying the positive power flows out of the body 20 to apply the power of the negative electrode. It is introduced into the body 20 of the purification device.

In the present invention, by detecting the water level of the electrolyte solution introduced into the body 20 of each purification device by the water level sensor 80 in the above process to further introduce the electrolyte solution through the inflow passage 50 or the outflow passage ( Through 70), the electrolyte solution introduced over the proper level may be leaked out.

In addition, heavy metals present in the contaminated soil are mainly introduced into the purification device (cathode) of the cathode by electrode reactions such as electrophoresis, electrophoresis and electroosmotic phenomenon, and in this process, the heavy metal contaminated soil is cleaned. .

In the above process, the electrolyte solution flows out through the slot 21 formed in the body 20 like the microbial liquid and passes through the filter bag 40. The filter bag 40 can filter foreign substances contained in the soil and easily pass the electrolyte solution.

Next, the electrolyte solution introduced into each purification apparatus, that is, the waste liquid formed by purifying the heavy metal is discharged to the outside of the purification apparatus through the outflow passage 70.

Therefore, the present invention purifies the soil through the electrokinetic treatment technology using the electrode reaction using the electrolyte solution after the application of bio-dissolution microorganism treatment technology using microbial fluid, biological treatment technology and electrokinetic treatment technology can be applied at the same time. have.

On the other hand, another embodiment of the apparatus for purifying heavy metal contaminated soil (101, 103, 103 ') according to the present invention is arranged in a plurality of soils contaminated with heavy metal, as shown in Figure 5, is arranged at a specific arrangement and intervals. Another embodiment is suitably applied when the electrolytic solution introduced into the purification apparatus is drained to the bottom of the soil layer when the electroconductive treatment technology is high, the conductivity of the contaminated site is very high consumption. In this case, the same reference numerals are used to designate the same components as in one embodiment, and detailed descriptions thereof will be omitted.

Purifier (101, 103, 103 ') is a purification device used at the same time as the extraction well from which the microbial fluid is extracted and the cathode portion receiving the power of the cathode, the purification device 101 is used at the same time as the injection well into which the microbial fluid is injected and the anode portion receiving the positive power The devices 103, 103 'can be arranged to wrap in a honeycomb shape.

That is, in the present invention, the purification apparatus (101, 103, 103 ') has the function of injecting and extracting the microbial solution in the bio-dissolution microorganism treatment technology and the electrolyte solution flows in the electrokinetic technology to serve as an electrode part. The purification pipe 103 used at the same time as the injection well and the anode portion is provided with a connection pipe 140 is connected to the adjacent purification device (103 '). A detailed description of the connection pipe at this time will be described later.

As shown in FIGS. 6 and 7, the purification apparatuses 101, 103, and 103 ′ include a body 120 including an inner body 121 and an outer body 123 disposed outside the inner body 121, and an inner portion thereof. The upper support 110 is coupled to the upper end of the body 121, and has a lower support 130 is coupled to the lower end of the outer body 123.

A filter bag (not shown) is provided to the outside of the inner body 101 and the outer body 103 to prevent foreign substances such as soil particles from penetrating into the electrolyte solution in the purification apparatus 101, 103, 103 ′.

In addition, the outer body 103 is filled with clay soil kneaded kaolinite or bentonite in a ratio of 2: 1 with water, and the inner body 101 is inserted into the outer body 103, the outer body 103 and the inner body Make sure that the space between (101) is filled with clay soil.

As a result, the electrolyte solution flowing into the inner body 101 can be prevented from being drained to the bottom of the soil layer, and the smooth electrokinetic treatment technology can be applied.

The upper support 110 has an inlet pipe 50 for introducing the microbial fluid or the electrolyte solution into the inner body 121, and an outlet passage 70 for outflowing the fluid introduced into the inner body 121; Water level sensor for detecting the level of the electrode rod 60 and the microbial or electrolyte solution introduced into the inner body 121, detachably by the electrode connecting socket 61, the electrode rod 60 is inserted into the inner body 121; 80 is installed. That is, in the present invention, the microbial fluid or the electrolyte solution introduced into the inner body 121 may be adjusted to an appropriate level.

The inner body 121 is equipped with a connection pipe 140 for simultaneously supplying the supplied microbial or electrolyte solution to the inner body 121 of the adjacent purification device. The connection pipe 140 is mounted only on the purification devices 103 and 103 'used simultaneously as the injection well and the anode part.

In this case, as shown in FIG. 5, three connection pipes 140 may be formed in one of the purification devices 103 used simultaneously as the injection well and the anode part at intervals of 120 degrees as described above. The adjacent purification device 103 'of the purification device 103 provided with three connection pipes 140 may have only the connection pipe 140 connected to the purification device 103. That is, in another embodiment of the present invention, it is possible to simultaneously adjust the water level of another adjacent purification device 103 'by adjusting the water level of one purification device 103.

In addition, the lower end of the inner body 121 may be made of a tip as shown. The lower end of the inner body 121 as described above is made to facilitate the insertion of the inner body 101 so that the inner body 121 can maintain a predetermined distance from the outer body 123.

The outer body 123 is disposed outside the inner body 121 as described above. The outer body 123 is disposed inside the contaminated soil, and as shown, the upper end of the outer body 123 may be disposed below the connection pipe 140 of the inner body 121.

In addition, the inner body 121 and the outer body 123 may be moved to the soil contaminated with the introduced microbial fluid or the soil contaminated with the electrolyte solution, the body of the purification device 101 that the moved heavy metal is used as the cathode portion Slots 122 and 124 are respectively formed to be introduced into.

Therefore, the present invention purifies the soil through the electrokinetic treatment technology using the electrode reaction using the electrolyte solution after the application of bio-dissolution microorganism treatment technology using microbial fluid, biological treatment technology and electrokinetic treatment technology can be applied at the same time. have. In addition, it is possible to simultaneously adjust the water level of another adjacent purification device through the level control of one of the above purification process.

10, 110: upper support 13: gas outlet
20, 120: body 121: internal body
123: outer body 21, 122, 124: slot
30, 130: lower support 40: filter bag
50: flow path 51: microbial fluid supply source
52 electrolyte source 53 valve
54: first pump 60: electrode
61: electrode connecting socket 63: power supply device
70: outflow passage 74: second pump
80: water level sensor 90: control unit
101, 103, 103 ′: Purifier 140: connection piping

Claims (11)

A body provided to allow the microbial or electrolyte solution to move in and out, an upper support screwed to the body, an electrode rod inserted into the body through the upper support, and connected to the upper support to the inside of the body. Including an inlet pipe for introducing a microbial fluid or an electrolyte solution, and an outlet pipe connected to the upper support to outflow the electrolyte solution inside the body,
The body includes an inner body coupled to the upper support at the upper end and the inner body in which the inlet and outlet pipes are installed, and an outer body disposed outside the inner body,
Clay soil is filled between the inner body and the outer body,
The lower end of the inner body is made of a tip so that the inner body is easily inserted into the outer body filled with the clay soil, so as to maintain a certain distance from the outer body, characterized in that the purification of soil contaminated with heavy metals Integrated purification device of bio-dissolution microbial treatment technology and electrokinetic technology for The method of claim 1,
The purification device is a first purification device that serves as an anode to inject the microbial fluid in the bio-eluting microorganism processing technology and the electrolyte solution in the electrokinetic processing technology, and extract to extract the microbial liquid in the bio-eluting microbial processing technology In addition to the step-by-step application of two different technologies, including a second purification device that serves as a cathode part by the introduction of electrolyte solution in the tablet and electrokinetic process technology, microorganisms and nutrients for bioelution can be applied using the electrokinetic technique. Integrated purification device of bio-dissolution microbial treatment technology and electrokinetic technology for the purification of soil contaminated with heavy metals, characterized in that it can be injected into the soil. The method of claim 1,
The inlet pipe is branched to the microbial fluid source and the electrolyte solution source, respectively,
Bio-eluting microorganism treatment technology for the purification of soil contaminated with heavy metals, characterized in that the first pump is provided with a valve for selectively supplying the fluid from the microbial fluid source or the electrolyte solution source to the body on the inlet pipe; Integrated purifier with electrokinetic technology. The method of claim 3,
The upper support is an integrated purification device of bio-dissolution microorganism treatment technology and electrokinetic technology for the purification of soil contaminated with heavy metal, characterized in that the water level detection sensor for detecting the level of the fluid flowing into the body is provided. The method of claim 4, wherein
Bio-dissolution microorganism treatment technology and electrokinetic technology for the purification of soil contaminated with heavy metal, characterized in that the second pump is installed on the outflow pipe to discharge the fluid inside the body according to the result detected by the water level sensor Integrated purifier. The method of claim 5,
The water level sensor, the first pump and the second pump is electrically connected to the control unit,
The control unit controls the operation of the first pump and the second pump according to the result detected by the water level sensor, the bio-dissolution microorganism treatment technology and electrokinetic technology for the purification of heavy metal contaminated soil Integrated Purifier. The method of claim 1,
The body has a slot is formed so that the microbial or electrolyte solution can move into and out of the body,
Bio-dissolution for purification of heavy metal contaminated soil, characterized in that the filter bag is provided on the outside of the body to prevent the inflow of foreign matter in the soil into the body and the microbial or electrolyte solution can be moved through the slot. Integrated purification device of microbial treatment technology and electrokinetic technology. The method of claim 1,
Bio-dissolution microorganism treatment technology and electrokinetic technology for the purification of the heavy metal contaminated soil, characterized in that the gas outlet for the smooth discharge of oxygen and hydrogen gas generated by the electrode reaction on the upper support. The method of claim 2,
The body of the purification device is an integrated purification device of bio-dissolution microorganism treatment technology and electrokinetic technology for the purification of soil contaminated with heavy metals, characterized in that the connection pipe is connected to the body of the adjacent purification device. delete 10. The method of claim 9,
The connection pipe is mounted on the inner body of the first purification device for the purification of the soil contaminated with heavy metals, characterized in that to simultaneously control the level of the adjacent first purification device only by adjusting the water level of one first purification device. Integrated purification device of bio-dissolution microbial treatment technology and electrokinetic technology.

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