JPH11235576A - Treatment of harmful metal-containing object and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove harmful metals from a living body and sewerage sludge incorporating the harmful metal in a short time. SOLUTION: Electrodes 4, 5 having stirring performance and moving performance are arranged in an electrolytic tank 1, and an electrolytic treatment is performed, while the harmful metal-containing object 30 and an electrolytic liquid are stirred with the electrodes 4, 5. The object 30a freed from the harmful metals by the electrolytic treatment is moved to a fermentation tank 2 by the moving performance of the electrodes 4, 5 to be performed a fermentation treatment in the fermentation tank 2. Thus, elution of the harmful metals and electric deposition on the electrodes are efficiently performed by the electrodes having the stirring performance, and the harmful metals are efficiently removed from the object. Besides, the object freed from the harmful metals is efficiently fermented by a series of operations.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for removing harmful metals from marine products, agricultural products, sludge, soil, etc., which contain harmful metals.
Cadmium contained in scallop uro, squid and sewage sludge that are incinerated or landfilled as industrial waste,
The present invention relates to a method and an apparatus suitable for removing harmful metals such as mercury and lead.

[0002]

2. Description of the Related Art It is known that harmful heavy metals such as cadmium and lead are accumulated at high concentrations in the midgut gland called uro of scallop and kidneys on the side of the scallop. Although these contain a large amount of protein and can be used as a raw material for fertilizers and the like, they contain tens of ppm of cadmium, and thus were incinerated or buried without utilization. However, burning or reclaiming the above-mentioned midgut glands and kidneys has a problem that requires a great deal of cost, and the securing of land for burial has reached its limit. In addition, there is a risk that harmful metals contained in the buried midgut glands and kidneys may enter the groundwater and contaminate the groundwater. In addition to the above organisms, most of the sewage sludge is disposed of by incineration, landfill, and the like, and there is a concern that the heavy metal contamination contained in the sewage sludge will increase.

[0003] To solve these problems, Japanese Patent Laid-Open Publication No.
In the specification of Japanese Patent No. 47257, there is proposed a method in which a heavy metal-containing organism is immersed in an acidic electrolyte to elute the heavy metal, and the eluted heavy metal is deposited on an electrode to remove the heavy metal from the organism. In addition, Japanese Patent Laid-Open Publication No. 8-74
No. 086 describes that sludge containing toxic metals is added with
H is reduced to elute heavy metals, and the sludge is electrolyzed in an electrolytic cell composed of iron for both the positive and negative electrodes. Then, the polarity of the electrodes is changed to remove the heavy metal-iron compound (ferrite) attached to the electrode plate. A method has been proposed in which the ferrite is separated, the ferrite is separated from the sludge by a magnetic separator, and harmful metals are removed.

[0004]

However, in each of the above-mentioned methods, elution of the harmful metal from the harmful metal-containing object into the electrolyte is carried out by the difference in concentration of the harmful metal between the harmful metal-containing object and the electrolyte. Therefore, when the content of harmful metals contained in the scallop shell or sewage sludge is very small, the concentration difference becomes extremely small, and there is a problem that it takes a long time to elute the harmful metals. . For example, in the method disclosed in Japanese Patent Application Laid-Open No. 9-47257,
It takes 24 to 39 hours for the processing, and there is a problem that the efficiency is low and the processing cost increases. Further, the current efficiency and electrodeposition rate in electrodeposition depend on the metal ion concentration and the current density in the electrolytic solution, but in the above method, the amount of harmful metals in the electrolytic solution is very small, and the concentration is very low. A large amount of power and a long time are required for electrodeposition. For this reason, a large processing cost is required even in the method using electrodeposition.

The present invention has been made in view of the above circumstances, and has as its object to provide a method and an apparatus for removing harmful metals from harmful metal-containing objects in a relatively short period of time with low power consumption. Is to do.

Further, the above-mentioned conventional method aims only to remove harmful metals from harmful metal-containing objects, but there is also a demand for reducing or eliminating the objects from which harmful metals have been removed. Another object of the present invention is to add a method and an apparatus for reducing or eliminating volume by mixing soil microorganisms with an object from which harmful metals have been removed and fermenting and decomposing the object from which harmful metals have been removed under anaerobic and / or aerobic conditions. In providing what we have done.

[0007]

According to a first aspect of the present invention, there is provided a method for treating a harmful metal-containing object, comprising: removing a harmful metal from the harmful metal-containing object by electrolytic treatment; Alternatively, a stirrer function is provided for all the electrodes, and the electrolytic treatment is performed while continuously or intermittently stirring the harmful metal-containing object using the electrode having the stirrer function.

A method for treating harmful metal-containing objects according to a second invention is a method for removing harmful metals from harmful metal-containing objects by electrolytic treatment, wherein a part or all of the electrodes have a stirring function and a movement function, The electrode having the stirring function continuously or intermittently stirs the harmful metal-containing object to remove the harmful metal from the harmful metal-containing object by performing electrolytic treatment, and further removes the harmful metal from the harmful metal-containing object by using the moving function. And moving the object with the electrode and mixing the object with soil microorganisms to ferment and decompose the object from which harmful metals have been removed under anaerobic and / or aerobic conditions.

According to a third aspect of the present invention, there is provided an apparatus for treating harmful metal-containing objects, comprising: an electrolytic cell for accommodating a harmful metal-containing object therein for performing an electrolytic treatment; and an electrolysis electrode located in the electrolytic cell. In the apparatus for treating a metal-containing object, a part or all of the electrode for electrolysis has a stirring function or a stirring function and a movement function for the harmful metal-containing object.

According to a fourth aspect of the present invention, there is provided an apparatus for treating a harmful metal-containing object, comprising: an electrolytic cell provided with an electrode for stirring and moving the harmful metal-containing object; and applying a DC voltage using the electrode as a cathode and the electrolytic cell as an anode. A DC power supply, a temperature controller for controlling the temperature of the electrolytic cell, and a fermentative decomposition of the object from which the harmful metal has been removed under anaerobic and / or aerobic conditions by mixing soil microorganisms with the object from which the harmful metal has been removed. A fermenter, a temperature controller for adjusting the temperature of the fermenter, a ventilator for feeding air to the fermenter and a ventilator controller, and a partitioning device for separating the electrolytic cell and the fermenter. It is characterized by the following.

According to a fifth aspect of the present invention, in the apparatus for treating harmful metal-containing objects according to the fourth aspect, a perforated plate is provided in the partition device. According to a sixth aspect of the present invention, in the third to fifth aspects, the electrode is provided with:
It comprises a rotating shaft and a stirring blade provided on the rotating shaft. In the apparatus for treating a harmful metal-containing object according to a seventh invention, in the third to sixth inventions, the electrode is provided with a thread which is cut into the harmful metal-containing object and which has an acute angle so that current is concentrated. It is characterized by being provided.

In the present invention, the harmful metal-containing objects to be treated include living organisms and sewage sludge. However, the object of the present invention is not limited to these, and various objects containing harmful metals can be used. In addition, as living organisms, marine products such as scallops and squid, animals, agricultural products or plants can be mentioned, and as harmful metals, cadmium, lead, arsenic,
Mercury, copper, zinc, nickel, chromium, manganese and the like can be mentioned. As a living body containing harmful metals,
For example, in the case of scallop, a midgut gland or kidney called uro can be mentioned, and in the case of squid, a liver can be mentioned. In addition, harmful metals contained in sewage sludge include zinc, copper, chromium, lead, nickel, arsenic,
Cadmium, mercury and the like can be mentioned.

[0013] In the method of the present invention, the harmful metal-containing object is treated by a treatment apparatus including an electrolytic cell for housing the harmful metal-containing object therein and performing an electrolytic treatment, and an electrolysis electrode located in the electrolytic cell. Can be processed. In the processing apparatus of the present invention, a part or all of the electrodes have a stirring function or a stirring function and a moving function. The stirring function of the electrode is obtained, for example, by configuring the electrode with a rotating shaft and a stirring blade provided on the rotating shaft. The stirring blades are desirably arranged continuously or intermittently along the longitudinal direction of the electrode, so that a uniform stirring action can be obtained in a wide range.

As the stirring blade, there can be mentioned a thread cut into the harmful metal-containing object and having an acute angle so that current is concentrated. With this thread shape, the harmful metal-containing object can be cut to form a new surface, and the contact area with the electrolytic solution increases, so that the harmful metal is eluted more quickly. Further, due to the acute angle shape of the thread, current concentration can be increased to increase current density, and electrodeposition can be performed more quickly. Further, by rotating the electrode provided with the thread having an acute angle, the electrolytic solution is stirred, and the Nernst diffusion layer (Nernst diffusion layer:
As the electrodeposition reaction progresses, the ion deficiency layer that is generated due to the consumption of metal ions on the cathode surface, a layer that affects the current density) is thinned to increase the current density and increase the current efficiency,
Power consumption can be reduced. If the thread angle of the thread is too small, the thread is sharp but easily broken or worn away. On the other hand, if the thread angle is too large, it is difficult to obtain a new surface due to poor sharpness, and current concentration cannot be sufficiently caused. For these reasons, the thread angle is preferably in the range of 5 to 90 degrees, and more preferably 10 to 60 degrees. In addition, the crest of the screw thread may be sharp, but may be chamfered with a curved surface, a flat surface, or a polygonal surface.

The function of moving the electrodes can utilize the above-mentioned stirring action. For example, a stirring blade such as the screw thread described above can be arranged in a spiral shape, and the object can be moved in a specific direction by rotation by the stirring blade. Note that the moving function is not limited to the one using the stirring function, and therefore, depending on the electrode, there may be one having only the stirring function and one having only the moving function. However, in order to obtain an efficient stirring and moving action, it is desirable that one electrode has both a stirring function and a moving function. The object excluding the harmful metal can be efficiently moved to the outside of the electrolytic cell by moving in a predetermined direction by using the moving function of the electrode. Moreover, as described later, the fermentation treatment can be continuously performed on the object.

In an electrode having a stirring function and a moving function using the stirring function, the harmful metal-containing object moves with the stirring, and therefore, it is desirable that the stirring direction (moving direction) can be changed. . Thereby, when the movement of the object from the electrolytic cell to the fermentation tank is not intended, the stirring direction can be sequentially changed to prevent the movement to the fermentation tank, and when the movement is intended, the moving direction is fixed. Then, the object can be quickly moved. In addition, when there are a plurality of electrodes having a stirring function and a movement function using the stirring function,
When the movement of the object from the electrolytic cell to the fermentation tank is not intended, the movement direction is set to different directions to prevent the movement to the fermentation tank. They can also be moved. If the object is moved with the stirring as described above, the stirring action is further increased.

Further, in the treatment apparatus of the present invention, as described above, the object from which the harmful metals have been removed in the electrolytic cell can be subjected to fermentation treatment in the fermentation tank. This fermenter is desirably connected to the electrolyzer on the side of the electrode having the movement function in the movement direction. Thus, the object can be quickly and efficiently transferred to the fermenter by the electrode moving function. Further, a partitioning device can be provided between the electrolytic cell and the fermenter. With this partitioning device, the object to be treated can be moved between the electrolytic cell and the fermentation tank only at a desired time, and the object can be prevented from moving between the two tanks when unnecessary. Further, the moving device can be provided with a perforated partition plate. The partition plate keeps air permeability between the electrolytic cell and the fermentation tank by a large number of holes and restricts the size of the holes to prevent the object to be treated from moving between the two tanks. By making the partition plate openable and closable, it can be opened when an object is moved between the electrolytic cell and the fermentation tank, and closed when the object is prevented from moving.

In the fermenter, an object from which harmful metals have been removed by the action of microorganisms can be subjected to fermentation treatment. In that case, soil microorganisms can be mixed and fermented with the object from which harmful substances have been removed. The type of microorganism and the method of mixing are not particularly limited, and for example, the microorganism can be introduced into a fermenter together with an appropriate medium (such as a culture solution or soil). In the fermenter, stirring, air supply, water supply, and the like can be performed as desired, and a device for controlling these can be additionally provided. In the fermenter, fermentation can be performed under anaerobic or aerobic conditions, and the anaerobic or aerobic conditions can be changed over time, or the fermentation can be performed by changing the conditions depending on the position in the fermenter. Can also. By this fermentation treatment, the object can be effectively used as a fertilizer or the like, or the volume can be reduced or eliminated. In addition,
In the electrolysis tank and the fermentation tank, it is desirable to control the temperature in the tank in order to perform electrolysis and fermentation efficiently, and it is therefore desirable to provide a temperature control device for each tank.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a processing apparatus according to the present invention will be described below with reference to FIGS. This processing apparatus is roughly divided into a lower electrolytic cell 1 and an upper fermenter 2,
Between the electrolytic cell 1 and the fermenter 2, porous partition plates 3, 3 constituting a part of a partition device are arranged in parallel. The electrolytic cell 1 is
The inner wall surface is formed of an electrode material so as to form an anode, and is connected to a positive electrode of a DC power supply (not shown). Further, two electrodes 4 and 5 are arranged in the electrolytic cell 1 along the longitudinal direction as cathodes. The electrodes 4 and 5 are formed in a cylindrical shape, and the outer peripheral surface thereof has a spiral thread 4a,
5a are formed, and the screw thread 4a and the screw thread 5a
It turns in the opposite direction and meshes with each other without contact.
Alternatively, although not shown, the screw thread 4a and the screw thread 5a
Are turning in the same direction and mesh with each other. The screw threads 4a and 5a have an acute angle with a sharp tip, and the screw thread angle θ is in the range of 5 to 90 degrees as shown in FIG. Is set with The same applies to the thread 5a. The shafts 4b and 5b below the electrodes 4 and 5 are connected to a speed reducer 7 through the bottom of the electrolytic cell 1, and the speed reducer 7 is connected to a driving device (motor or the like) not shown. Have been. In addition,
A seal ring 8 is attached between the shafts 4b and 5b of the electrodes 4 and 5 and the bottom of the electrolytic cell 1 so that the electrolyte does not leak from a gap between them.

The electrodes 4 and 5 are rotated in a desired direction by the driving device and the speed reducer 7, but the rotation direction can be rotated in either forward or reverse direction. The rotation direction and rotation speed can be controlled separately. The electrodes 4 and 5 are connected to a negative electrode of a DC power supply (not shown) so as to form a cathode.
At the time of connection, the electrodes 4 and 5 are electrically connected via slip rings 9 provided on the shaft portions 4b and 5b so that power is supplied to the electrodes 4 and 5 even when the electrodes 4 and 5 rotate. The electrolytic cell 1 in which the electrodes 4 and 5 are arranged has an outer peripheral surface covered with an electrolytic cell temperature control device 10. Temperature can be adjusted. In addition, a lower ventilation pipe 11 is inserted into the upper part of the electrolytic cell 1 from the outside, and the lower ventilation pipe 11 is connected to a ventilation device (a ventilation control device, a blowing device, etc.) not shown.

Next, between the electrolytic cell 1 and the fermenter 2, the porous partition plates 3, 3 are arranged as described above. The partition plates 3 and 3 can be opened and closed between the electrolytic cell 1 and the fermentation tank 2 by being slid by a driving device (not shown) so as to be in contact with and separated from each other. A large number of holes 3a... 3a penetrating upward are formed in the partition plates 3, 3, and the holes 3a are large enough to obtain air permeability, and an object to be processed is provided. It is formed in a size that is difficult to pass.

On the other hand, in the fermenter 2, the upper part is a top plate 2a.
The upper ventilation pipe 20 and the exhaust pipe 21 are inserted from outside so as to penetrate the top plate 2a. The upper ventilation pipe 20 is connected to a ventilation device (not shown), and the exhaust pipe 21 is also connected to an exhaust processing device (not shown). The outer peripheral surface of the fermenter 2 is covered with a fermenter temperature controller 22.
Thereby, the temperature of the fermenter 2 can be adjusted by heating or cooling the fermenter 2. A return pipe 26 is connected between the fermenter 2 and the electrolytic cell 1 via a pump 25, and exhaust gas and water vapor in the fermenter 2 are supplied to the electrolytic cell 1.
It is configured so that it can be transferred to.

Next, a processing method using the above processing apparatus will be described. Desired harmful metal-containing object 30 and electrolyte 31
Are accommodated in the electrolytic cell 1 and the electrodes 4 and 5 are rotated in opposite directions or in the same direction via a speed reducer 7 by a driving device (not shown). At this time, the shaft portions 4b of the electrodes 4, 5
Since the seal ring 8 is provided between the fermenter 5b and the bottom of the fermenter, leakage of the electrolytic solution from the electrolytic cell 1 is prevented. The rotation of the electrodes 4 and 5 causes the thread 4
a, 5a is rotated to stir the harmful metal-containing object 30 while cutting the harmful metal-containing object 30 to make a new surface appear, and to move the harmful metal-containing object 30 while turning it according to the threads 4a, 5a. Metal-containing object 30 and electrolyte 31
The harmful metal is quickly eluted from the harmful metal-containing object 30 into the electrolyte 31 by increasing the contact area with the electrolyte and the diffusion distance to the electrolyte. During this time, the harmful metal-containing object 30 and the electrolytic solution 31 can be moved upward and downward while stirring, by controlling the rotation of the electrodes 4 and 5 and appropriately changing the rotation direction. Thereby, the above-mentioned action is further increased.

When the elution has progressed, a current is supplied between the electrodes 4 and 5 and the electrolytic cell 1 by a DC power supply,
The harmful metal in the electrolytic solution 31 is electrodeposited on the electrodes 4 and 5 using 5 as a cathode and the electrolytic cell 1 as an anode. At this time, the power supply to the electrodes 4 and 5 is maintained even while the electrodes 4 and 5 are rotating due to the presence of the slip ring 9. However, at the time of electrodeposition, the electrodes 4 and 5 may be rotated or stopped, but in order to perform the electrodeposition more efficiently, the electrodes 4 and 5 are continuously or intermittently rotated. It is desirable to conduct the current while the current is flowing. In the electrodes 4 and 5, the harmful metals in the electrolytic solution are efficiently deposited on the electrodes 4 and 5 because the current is concentrated and the current density is increased due to the acute shape of the threads 4a and 5a. . Also, if the electrodes 4 and 5 are rotated during electrodeposition, the electrolytic solution is agitated and the current efficiency increases,
Power consumption can be reduced. Further, at the time of elution and electrodeposition of the harmful metal, the temperature of the electrolytic cell 1 is kept at an optimal electrodeposition temperature by the electrolytic cell temperature controller 10. In this embodiment, the harmful metal-containing object 30 is used.
After the harmful metals were eluted to some extent, the electrodes 4 and 5 were energized for electrodeposition. However, the elution and electrodeposition can be performed simultaneously by energizing the electrodes 4 and 5 from the beginning. is there.

Next, after the harmful metal is removed by the electrolytic treatment, the object 30a from which the harmful metal has been removed is raised by the rotation of the electrodes 4 and 5, and the partition plate 3 is driven by a driving device (not shown) of the partitioning device. After the object 30a is moved to the fermenter 2 and the partition plates 3 and 3 are closed, the object 30a is stored in the fermenter 2. Then, in the fermenter 2, the object 30 a and a soil microorganism (not shown) are mixed and fermented. At this time, first, air is sent into the electrolytic cell 1 through the lower ventilation pipe 11 provided in the electrolytic cell 1, and further, air is sent into the fermentation tank 2 through many holes 3 a of the partition plate 3. Thus, fermentation in the fermenter 2 proceeds efficiently under aerobic conditions. Also, if necessary,
Air can also be sent into the fermenter 2 using the upper vent pipe 20. During fermentation, the temperature of the fermenter 2 is maintained at an optimum fermentation temperature by the fermenter temperature controller 22. If the object 30a is to be anaerobically fermented, the fermentation can be performed under anaerobic conditions without performing the above-described air supply. The steam, carbon dioxide, and the like generated by the fermentation can be exhausted to the outside through an exhaust pipe 21 provided in the fermenter 2, and a part or all of the fermenter 2 can be exhausted by a pump 25 through a return pipe 26. To the electrolytic cell 1 to stir the electrolytic solution 31 or
1 can be used for pH (pH) adjustment. Through the fermentation, the object can be effectively used as a fertilizer or the like, or can be reduced in volume or eliminated.

In the above embodiment, the number of electrodes in the electrolytic cell is two, but the number of electrodes may be one or three or more. However, in order to sufficiently stir and move the harmful metal-containing object and the electrolytic solution, two or more are preferable. When a plurality of electrodes are provided, the type in which the threads are engaged is superior to the non-engaged type in cutting the harmful metal-containing object to produce a new surface, and in particular, the harmful metal-containing object is a biological object. In the case of the above, the effect becomes remarkable. Also,
In the description so far, an object obtained by removing harmful metals from harmful metal-containing objects in an electrolytic cell was fermented in a fermenter,
The harmful metal-containing object is first fermented in the fermenter, and the resulting liquid containing the harmful metal is dropped into the electrolytic cell through the pores of the partition plate to remove the harmful metal by electrodeposition. Further, in the above embodiment, the electrolytic cell and the fermenter are arranged vertically, but they may be arranged laterally and the electrodes may be arranged along the lateral direction.

[0027]

As described above, according to the present invention, a part or all of the electrodes have a stirring function, and the harmful metal-containing object is stirred continuously or intermittently by the electrodes having the stirring function. Since the electrolytic treatment is performed while harmful metals are eluted and electrodeposited efficiently, harmful metals can be removed in a short time and at low cost.

According to the present invention, a part or the whole of the electrode has a stirring function and a moving function, and the harmful metal-containing object is continuously or intermittently stirred by the electrode having the stirring function. To remove the harmful metal from the harmful metal-containing object, further move the object from which the harmful metal has been removed by the electrode having the movement function, and mix the object with soil microorganisms, thereby anaerobically and / or favorably. Since the object from which the harmful metal has been removed is fermented and decomposed under pneumatic conditions, in addition to the above-described effects, an effect is obtained in which the harmful metal-containing object can be efficiently treated by a series of operations.

If the electrode is provided with a thread which is cut into the harmful metal-containing object and has an acute angle so that the current is concentrated, the elution time of the harmful metal into the electrolyte is reduced and the current efficiency is reduced. Therefore, harmful metals can be processed in a short time with low power consumption.

[Brief description of the drawings]

FIG. 1 is a longitudinal section of a heavy metal removal processing apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged partial cross-sectional view showing a thread of an electrode.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrolyzer 2 Fermenter 3 Partition plate 3a Hole 4 Electrode 4a Screw 5 Electrode 5a Screw 10 Electrolyzer temperature controller 11 Lower ventilation pipe 20 Upper ventilation pipe 22 Fermenter temperature controller 30 Object containing harmful metal 30a Removed object 31 Electrolyte

Claims (7)

[Claims] 1. A method for removing a harmful metal from a harmful metal-containing object by electrolytic treatment, wherein a part or all of the electrodes have a stirring function, and the harmful metal-containing object is continuously or intermittently operated by the electrode having the stirring function. Method for treating harmful metal-containing object, wherein electrolytic treatment is performed while periodically stirring 2. A method for removing a harmful metal from a harmful metal-containing object by electrolytic treatment, wherein a part or all of the electrode has a stirring function and a moving function, and the electrode having the stirring function continuously or intermittently operates. The harmful metal-containing object is subjected to electrolytic treatment while being stirred to remove harmful metal from the harmful metal-containing object, and further, the object with the harmful metal removed is moved by the electrode having the movement function, and the object is replaced with soil microorganisms. A harmful metal-containing object, wherein the harmful metal-removed object is fermented and decomposed under anaerobic and / or aerobic conditions. 3. An apparatus for treating a harmful metal-containing object, comprising: an electrolysis tank for accommodating a harmful metal-containing object therein for performing an electrolytic treatment; and an electrolysis electrode located in the electrolysis tank. Part or all of the apparatus has a stirring function or a stirring function and a moving function for a harmful metal-containing object, and a treatment apparatus for a harmful metal-containing object. 4. An electrolytic cell provided with an electrode having a function of stirring and moving the harmful metal-containing object, a DC power supply for applying a DC voltage using the electrode as a cathode and the electrolytic cell as an anode, A temperature control device for controlling the temperature, a fermenter for mixing the soil microorganisms with the object from which the harmful metal has been removed, and fermenting and decomposing the object from which the harmful metal has been removed under anaerobic and / or aerobic conditions; Processing of harmful metal-containing objects, comprising: a temperature control device for controlling the temperature, a ventilation device for sending air into the fermentation tank and a ventilation control device, and a partition device for separating the electrolysis tank and the fermentation tank. apparatus 5. An apparatus for treating harmful metal-containing objects according to claim 4, wherein a perforated plate is provided in said partitioning device. 6. The apparatus for treating harmful metal-containing objects according to claim 3, wherein the electrode comprises a rotating shaft and a stirring blade provided on the rotating shaft. 7. The electrode according to claim 3, wherein the electrode is provided with a thread cut into the harmful metal-containing object and having an acute angle so that a current is concentrated. Hazardous metal-containing object processing device