Target component recovery system and target component recovery method

Abstract

To provide appropriate recovery of a target component contained in seawater.SOLUTION: A system includes an adsorbent storage tank for storing an adsorbent that adsorbs an object component in a solution, an electric bacteria storage tank for storing electric bacteria that assist the adsorption of the adsorbent, a mixing tank for mixing the adsorbent with the electric bacteria, an adsorption apparatus for generating an adsorption solution containing the solution and the adsorbent by adding the adsorbent mixed with the electric bacteria in the mixing tank to the solution, a solid-liquid separation apparatus for separating the adsorbent from the adsorption solution, and an adsorbent recovery apparatus for desorbing the target component from the adsorbent.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a target component recovery system and a target component recovery method. [Background technology]

[0002] Techniques for recovering resources contained in seawater from seawater have been disclosed. For example, Patent Document 1 discloses a technique for recovering lithium by adsorbing lithium in seawater with an adsorbent, injecting carbon dioxide gas discharged from a power plant into the seawater to bubble it, and recovering lithium carbonate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 1-313323 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to properly recover target components contained in seawater, there is room for improvement in order to increase recovery efficiency.

[0005] The present disclosure has been made in consideration of the above, and aims to provide a target component recovery system and a target component recovery method that can appropriately recover target components contained in seawater. [Means for solving the problem]

[0006] The target component recovery system of the present disclosure includes an adsorbent storage tank for storing an adsorbent that adsorbs a target component in a solution, an electric bacteria storage tank for storing electric bacteria that assist in adsorption by the adsorbent, a mixing tank for mixing the adsorbent and the electric bacteria, an adsorption device that adds the adsorbent after mixing with the electric bacteria in the mixing tank to the solution to produce an adsorption liquid containing the solution and the adsorbent, a solid-liquid separation device that separates the adsorbent from the adsorption liquid, and an adsorbent recovery device that desorbs the target component from the adsorbent.

[0007] The target component recovery method according to the present disclosure includes the steps of storing an adsorbent that adsorbs the target component in a solution, storing electric bacteria that assist the adsorption of the adsorbent, mixing the adsorbent with the electric bacteria, adding the adsorbent after mixing with the electric bacteria in the mixing step to the solution to produce an adsorption liquid containing the solution and the adsorbent, separating the adsorbent from the adsorption liquid, and desorbing the target component from the adsorbent. [Effects of the Invention]

[0008] According to the present disclosure, target components contained in seawater can be appropriately recovered. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing the overall configuration of a target component recovery system according to the first embodiment. [Figure 2] FIG. 2 is a schematic diagram showing the flow of target components contained in seawater. [Figure 3] FIG. 3 is a flowchart showing an example of a target component recovery method of the target component recovery system according to the first embodiment. [Figure 4] FIG. 4 is a schematic diagram showing the overall configuration of a target component recovery system according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Preferred embodiments of the present disclosure will be described in detail below with reference to the drawings. Note that the present disclosure is not limited to these embodiments, and when there are multiple embodiments, the present disclosure also includes configurations that combine the various embodiments. Furthermore, the components in the embodiments include those that can be easily imagined by a person skilled in the art, those that are substantially identical, and those that are within the so-called equivalent range. Furthermore, the components in the embodiments described below can be variously omitted, substituted, or modified without departing from the spirit of the present invention.

[0011] [First embodiment] A target component recovery system 1 according to this embodiment will be described with reference to Figures 1 and 2. Figure 1 is a schematic diagram showing the overall configuration of the target component recovery system according to the first embodiment. Figure 2 is a schematic diagram showing the flow of target components contained in seawater.

[0012] <Target component recovery system> As shown in FIGS. 1 and 2 , the target component recovery system 1 includes a plant 100, a water intake facility 10, an adsorbent storage tank 20, an electrobacterial storage tank 22, a gas treatment device 24, a mixing tank 26, an adsorbent separation device 28, an adsorption device 30, a solid-liquid separation device 40, an adsorbent recovery device 42, a first wastewater treatment device 43, a first treatment device 50, a concentrator 60, a second treatment device 70, a second wastewater treatment device 72, a target component recovery device 74, and a control unit 90. The target component recovery system 1 recovers target components (resources) contained in a solution by performing a predetermined process. Here, the solution is preferably seawater, concentrated wastewater from a seawater desalination facility that produces freshwater from seawater, or brine from a salt lake. Examples of target components include lithium, uranium, and magnesium, but are not limited to these as long as they can be recovered using the system of the present disclosure. In the following description, the solution is seawater and the target component is lithium. That is, the target component recovery system according to the present disclosure is a system for recovering lithium contained in seawater.

[0013] (plant) The plant 100 is a facility that produces resources and materials necessary for industrial activities. The plant 100 preferably uses seawater taken from a water intake facility 10 (described later). The plant 100 also discharges a heated medium, a waste heat medium, generated during operation. The waste heat medium may be any medium. For example, if the plant 100 is equipped with a steam turbine, the waste heat medium may be steam after driving the steam turbine. For example, if the plant 100 is equipped with a boiler, the waste heat medium may be steam after use in the boiler. The plant 100 may also discharge the waste heat medium from multiple locations. The plant 100 may be any facility that uses seawater and discharges a waste heat medium, for example, a nuclear power plant, a thermal power plant, a chemical plant, or the like. In this embodiment, the plant 100 will be described using a nuclear power plant as an example. In this embodiment, the plant 100 is preferably an operating plant.

[0014] (Nuclear power generation facilities) Here, an overview of a nuclear power plant (nuclear power plant) will be described. The nuclear power plant has, for example, a pressurized water reactor (PWR). The nuclear power plant generates, for example, electricity using heat generated in the pressurized reactor. The nuclear power plant uses light water as a reactor coolant and a neutron moderator to produce high-temperature, high-pressure water that does not boil throughout the entire reactor core. This high-temperature, high-pressure water (primary coolant) is sent to a steam generator, where steam is generated by heat exchange. This steam (secondary coolant) is then sent to a turbine generator to generate electricity. Here, the secondary coolant is converted into steam in the steam generator by the heat of the high-temperature, high-pressure primary coolant from the reactor, drives the steam turbine, and is then cooled by seawater in a condenser 101 to become condensed water, which is then returned to the steam generator by a condensate pump. Note that the nuclear power plant may also be a nuclear power plant using a boiling water reactor (BWR).

[0015] After the secondary coolant drives the steam turbine to generate electricity, the condenser 101 cools the secondary coolant with seawater from the sea S to generate condensate. The steam, which is the secondary coolant, passes through a steam flow path 101a and is sent to the condenser 101. The condenser 101 supplies the generated condensate to the steam generator through a condensate flow path 101b.

[0016] (Water intake equipment) The water intake facility 10 is used in the plant 100 and takes in seawater as a solution. The water intake facility 10 takes in seawater from an intake target adjacent to the plant 100 (nuclear facility), which in this embodiment is the sea S, supplies the acquired seawater to a condenser 101, and discharges seawater discharged from the condenser 101 to the adsorption device 30. The water intake facility 10 includes a water intake channel 12, a screen 14, a discharge channel 16, and a pump P.

[0017] The intake channel 12 is a channel having one end connected to the sea S and the other end connected to the condenser 101. Seawater flows into the intake channel 12 from the sea S and is supplied to the condenser 101. A certain range of the intake channel 12 from the side connected to the condenser 101 becomes a pipeline. The portion of the intake channel 12 that connects to the sea S may be, for example, a channel with an open top.

[0018] The screen 14 is installed midway along the water intake channel 12. The screen 14 is a mesh member. The screen 14 removes foreign matter contained in the seawater. The seawater passes through the screen 14 and flows into the condenser 101 by a pump P installed further ahead.

[0019] One end of the discharge channel 16 is connected to the condenser 101, and the other end is connected to the adsorption device 30. A portion of the discharge channel 16 on the side connected to the condenser 101 is, for example, hollow and cylindrical, and the seawater that has cooled the secondary coolant in the condenser 101 flows toward the adsorption device 30. In other words, the discharge channel 16 can be said to be a pipe that connects between the water intake facility 10 and the adsorption device 30.

[0020] The pump P causes seawater taken in from the water intake channel 12 to flow into the condenser 101. The pump P is connected to a drive unit (not shown). The pump P operates when the drive unit is driven.

[0021] (adsorbent storage tank) The adsorbent storage tank 20 stores an adsorbent that adsorbs target components in a solution (seawater). The adsorbent storage tank 20 supplies the adsorbent to the mixing tank 26. The adsorbent storage tank 20 supplies the stored adsorbent to the mixing tank 26 under the control of the control unit 90. For example, the adsorbent storage tank 20 is provided with a pipe connected to the mixing tank 26 and a valve attached to the pipe, and the control unit 90 controls the opening and closing of the valve to control the supply of the adsorbent in the adsorbent storage tank 20 to the mixing tank 26. In this embodiment, the adsorbent storage tank 20 stores a mixture of the adsorbent and a liquid. That is, the adsorbent storage tank 20 stores the adsorbent in a state where the adsorbent is contained in the liquid. The liquid here may be any liquid, such as water. A gas treatment device 24 may be connected to the adsorbent storage tank 20. The gas treatment device 24 will be described later.

[0022] Here, the adsorbent will be described. An adsorbent is a substance that adsorbs a target component (resource) contained in a solution (e.g., seawater). For example, the adsorbent adsorbs a target component contained in seawater in an ionic state. The adsorbent may be, for example, in powder form. The adsorbent may be any substance capable of adsorbing a target component. For example, when the target component to be recovered is lithium, manganese oxide may be used as the adsorbent. In this case, the adsorbent is preferably manganese oxide with openings large enough to allow lithium ions to penetrate so as to capture the lithium ions. Furthermore, when the target component is uranium, for example, an adsorbent (mole) other than manganese oxide may be used. Furthermore, multiple types of adsorbents may be used. However, the adsorbent is not limited to a manganese oxide specifically for recovering lithium or a mole specifically for recovering uranium, and may be an adsorbent having a structure suitable for the resource to be recovered. For example, the adsorbent may be a general manganese oxide rather than a manganese oxide specifically for recovering lithium. This enables manganese oxide to adsorb resources other than lithium.

[0023] (Electric Bacteria Storage Tank) The electric bacteria storage tank 22 is connected to the bait storage tank 22a and the mixing tank 26. The electric bacteria storage tank 22 stores electric bacteria that assist the adsorption of target components by the adsorbent. Electric bacteria are bacteria that exchange electrons with other substances. The electric bacteria storage tank 22 supplies the stored electric bacteria to the mixing tank 26 under the control of the control unit 90. For example, the electric bacteria storage tank 22 is provided with a pipe connected to the mixing tank 26 and a valve attached to the pipe, and the control unit 90 controls the opening and closing of the valve to control the supply of the electric bacteria in the electric bacteria storage tank 22 to the mixing tank 26. In this embodiment, the electric bacteria storage tank 22 stores a mixture of electric bacteria and a liquid. That is, the electric bacteria are stored in the electric bacteria storage tank 22 in a state where the electric bacteria are contained in the liquid. The liquid may be any liquid, such as water.

[0024] Furthermore, food for the electric bacteria may be supplied to the electric bacteria storage tank 22 from a food storage tank 22a described below. The food for the electric bacteria is food that is consumed by the electric bacteria, and may be any food that is consumed by the electric bacteria to cultivate the electric bacteria. The electric bacteria storage tank 22 may be provided with a filter that allows the electric bacteria to pass through to the mixing tank 26 but does not allow the food to pass through, or a filter that can filter the food. This can prevent the food from being mixed into the mixing tank 26.

[0025] (Feed storage tank) The bait storage tank 22a stores bait for the electric bacteria. The bait storage tank 22a supplies the stored bait to the electric bacteria storage tank 22 under the control of the control unit 90. For example, the bait storage tank 22a is provided with a pipe connected to the electric bacteria storage tank 22 and a valve provided on the pipe, and the control unit 90 controls the opening and closing of the valve, thereby controlling the supply of bait for the electric bacteria in the bait storage tank 22a to the electric bacteria storage tank 22. However, the bait storage tank 22a does not have to be provided.

[0026] (food and electric bacteria) Here, we will explain about food and electric bacteria. Food for electric bacteria is smaller than electric bacteria and is dissolved in the liquid. Electric bacteria move through the liquid. Electric bacteria generate energy by eating food dissolved in the liquid. The energy generated by electric bacteria is used to divide electric bacteria. The energy generated by electric bacteria is also used by electric bacteria to release electrons. That is, electric bacteria can donate the released electrons to an adsorbent. By donating the released electrons to an adsorbent, electric bacteria can increase the adsorption efficiency of the adsorbent. The adsorbent is contained in the adsorbent storage solution. Therefore, when oxygen is present in the adsorbent storage solution, electric bacteria will donate electrons to the oxygen. In other words, electric bacteria suppress the generation of electrons. Furthermore, the size of electric bacteria is about 1 micrometer. In the present disclosure, electric bacteria may be solid and food for electric bacteria may be liquid.

[0027] (Gas treatment equipment) The gas treatment device 24 removes oxygen from the adsorbent-containing liquid. For example, the gas treatment device 24 removes oxygen from the adsorbent-containing liquid by supplying a gas to the adsorbent-containing liquid. The gas supplied by the gas treatment device 24 may be any gas, such as nitrogen. By removing oxygen from the adsorbent-containing liquid, the gas treatment device 24 can suppress oxidation of the adsorbent. Furthermore, the provision of the gas treatment device 24 allows the electrobacteria to generate electrons and efficiently provide the generated electrons to the adsorbent. The gas treatment device 24 may be provided at any location before the adsorbent and electrobacteria are mixed in the mixing tank 26. For example, the gas treatment device 24 may be connected to the mixing tank 26 and supply an oxygen-free gas to the mixing tank 26. For example, the gas treatment device 24 may be connected to the adsorbent storage tank 20 and supply an oxygen-free gas to the adsorbent storage tank 20. Connecting the gas treatment device 24 to the adsorbent storage tank 20 is preferable because it can remove oxygen from the adsorbent before it is mixed with the electrobacteria, thereby more suitably improving the recovery efficiency of the target component. Note that the gas treatment device 24 may also remove oxides such as fumaric acid and nitric acid in addition to oxygen. However, the gas treatment device 24 does not necessarily have to be provided.

[0028] (Mixing tank) The mixing tank 26 is connected to the adsorbent storage tank 20 and the electrobacteria storage tank 22. The mixing tank 26 is supplied with adsorbent from the adsorbent storage tank 20 and with electrobacteria from the electrobacteria storage tank 22. The supplied adsorbent and electrobacteria are stored in a mixed state in the mixing tank 26. In this embodiment, the adsorbent and electrobacteria are mixed in a liquid. The liquid here may be any liquid, for example, water. Hereinafter, the liquid in which the adsorbent and electrobacteria are mixed will be referred to as a mixed liquid as appropriate. The amount of adsorbent and the amount of electrobacteria supplied to the mixing tank 26 are adjusted (controlled) by the control unit 90.

[0029] The adsorbent mixed with the electrobacteria in the mixing tank 26 receives electrons from the electrobacteria and becomes in an electron-collecting state, thereby improving the adsorption performance of the adsorbent.

[0030] Under the control of the control unit 90, the mixing tank 26 supplies the adsorbent mixed with the electrobacteria in the mixing tank 26 to the adsorption device 30. For example, the mixing tank 26 is provided with a pipe connected to the adsorption device 30 and a valve attached to the pipe, and the control unit 90 controls the opening and closing of the valve, thereby controlling the supply of the adsorbent in the mixing tank 26 to the adsorption device 30.

[0031] (Adsorbent separation device) In this embodiment, it is preferable to provide an adsorbent separation device 28 that separates the adsorbent from the electrobacteria after it has been mixed with the electrobacteria in the mixing tank 26. The adsorbent separation device 28 separates the electrobacteria from the mixed liquid and selectively extracts the adsorbent. The adsorbent separation device 28 may have any configuration that extracts the adsorbent, and may be, for example, a filter that separates the adsorbent from the electrobacteria. Furthermore, for example, when bait is supplied to the mixing tank 26 together with the electrobacteria, it is preferable that the adsorbent separation device 28 separates the adsorbent from the electrobacteria and bait and extracts only the adsorbent.

[0032] When the adsorbent separation device 28 is provided, the control unit 90 supplies the adsorbent separated from the electrobacteria by the adsorbent separation device 28 to the adsorption device 30. For example, the adsorbent separation device 28 is provided in a pipe connecting the mixing tank 26 and the adsorption device 30, and the control unit 90 controls the opening and closing of a valve, thereby controlling the supply of the adsorbent separated from the electrobacteria by the adsorbent separation device 28 to the adsorption device 30.

[0033] The adsorbent separation device 28 may return the electrobacteria (or electrobacteria and bait) separated from the adsorbent to the mixing tank 26 or the electrobacteria storage tank 22. For example, a pipe connected to the mixing tank 26 or the electrobacteria storage tank 22 is connected to the adsorbent separation device 28, and the electrobacteria separated from the adsorbent are returned to the mixing tank 26 or the electrobacteria storage tank 22 through this pipe.

[0034] However, the adsorbent separation device 28 does not have to be provided. When the adsorbent separation device 28 is not provided, the adsorbent and electrobacteria mixed in the mixing tank 26 are supplied to the adsorption device 30.

[0035] (Adsorption device) The adsorption device 30 is a device that adds the adsorbent, which has been mixed with the electrobacteria in the mixing tank 26, to a solution (seawater) to produce an adsorption liquid containing the solution and the adsorbent.

[0036] The adsorption device 30 is supplied with seawater as a solution taken in by the water intake facility 10 via the discharge channel 16. That is, the seawater taken in by the water intake facility 10 undergoes heat exchange in the condenser 101 and then flows into the adsorption device 30 through the discharge channel 16. The adsorption device 30 is also supplied with an adsorbent mixed with electrobacteria from the mixing tank 26. As a result, the adsorbent is added to the seawater in the adsorption device 30, and an adsorption solution containing seawater and the adsorbent is produced. Note that the adsorption device 30 may be provided with, for example, an agitator that agitates the seawater and the adsorbent. Note that the adsorption device 30 may be supplied with both electrobacteria and the adsorbent, but it is preferable that the adsorption device 30 be supplied with the adsorbent separated in the adsorbent separator 28.

[0037] When the adsorbent separation device 28 is provided, the adsorption device 30 is supplied with the adsorbent that has been mixed with the electrobacteria and then separated from the electrobacteria. In this case, the adsorption liquid is a liquid mixture of seawater (solution) and the adsorbent. On the other hand, when the adsorbent separation device 28 is not provided, the adsorption device 30 is supplied with the adsorbent that has been mixed with the electrobacteria and the electrobacteria (i.e., a mixed liquid). In this case, the adsorption liquid is a liquid mixture of seawater (solution), the adsorbent, and the electrobacteria.

[0038] It is preferable that the adsorbent-added seawater (adsorption solution) be stored in the adsorption device 30 for a predetermined period (e.g., several days to 14 days). Storing the seawater for a predetermined period allows the target components to be appropriately adsorbed by the adsorbent. When storing seawater for a predetermined period, while the seawater is being stored in one adsorption device 30, seawater can be taken into another adsorption device 30 and an adsorbent can be added. That is, while the target component recovery system 1 is taking in seawater into one adsorption device 30, it can also take in seawater into another adsorption device 30, allowing for efficient recovery processing. Therefore, it is preferable that the target component recovery system 1 be provided with multiple adsorption devices 30. More specifically, after taking in seawater into one adsorption device 30 and adding an adsorbent, the supply of seawater to that adsorption device 30 may be stopped while the seawater is taken into another adsorption device 30. By performing this process for multiple adsorption devices 30, the target components can be efficiently recovered.

[0039] (Solid-liquid separator) The solid-liquid separation device 40 is connected to the adsorption device 30, the adsorbent recovery device 42, and the first waste liquid treatment device 43. The solid-liquid separation device 40 separates the adsorption liquid produced in the adsorption device 30 into seawater and the adsorbent using a solid-liquid separation technique such as precipitation separation. The solid-liquid separation device 40 has, for example, a tank, in which a filter for filtering the adsorbent and a mechanism for supplying the filtered adsorbent to the adsorbent recovery device 42 are provided. A precipitation method may be used for solid-liquid separation. The separated seawater is supplied as waste liquid to the first waste liquid treatment device 43, and the adsorbent is supplied to the adsorbent recovery device 42.

[0040] (Adsorbent recovery device) The adsorbent recovery device 42 is connected to a solid-liquid separation device 40, a desorbent storage tank 41, an adsorbent storage tank 20, and a first treatment device 50. The adsorbent recovery device 42 is supplied with the adsorbent that has adsorbed the target components and that has been separated from seawater in the solid-liquid separation device 40. The desorbent storage tank 41 is a device that supplies the desorbent to the adsorbent recovery device 42, and is a device that desorbs (extracts) the target components from the adsorbent to generate a desorbed liquid containing the desorbent and the target components. The adsorbent recovery device 42 supplies the adsorbent from which the target components have been desorbed to the adsorbent storage tank 20. This allows the adsorbent to be reused.

[0041] Here, the desorbent will be described. The desorbent is a substance that desorbs (extracts) the target component adsorbed in the adsorption solution from the adsorption solution. The desorbent may be any substance that desorbs the target component from the adsorption solution, but is preferably, for example, an acidic solution that captures the target component. For example, if the target component to be recovered is lithium, hydrochloric acid may be used.

[0042] (First waste liquid treatment vessel) The first waste liquid treatment device 43 is connected to the solid-liquid separation device 40 on one side and to the sea S on the other side. The first waste liquid treatment device 43 treats the waste liquid after the adsorbent has been recovered in the solid-liquid separation device 40 so that it can be returned to the sea S, and discharges the treated waste liquid into the sea S. When the adsorption device 30 treats the waste liquid, the first waste liquid treatment device 43 is connected to the adsorption device 30 on one side and to the sea S on the other side. In this case, the waste liquid flows from the adsorption device 30 to the first waste liquid treatment device 43, and the first waste liquid treatment device 43 treats the waste liquid and discharges the treated waste liquid into the sea S.

[0043] (First processor) One end of the first processor 50 is connected to the adsorbent recovery device 42, and the other end is connected to the concentrator 60. The first processor 50 is a device that adds a neutralizing agent to the eluate containing the target component and the desorbent to separate impurities contained in the eluate, and removes the separated impurities by filtration. For example, in this embodiment, the first processor 50 may be a tank that stores the eluate flowing from the adsorbent recovery device 42. The first processor 50 may also be connected to a neutralizing agent storage tank 51 that supplies a neutralizing agent to the first processor 50. The neutralizing agent may be any substance that separates impurities, but is preferably, for example, an alkaline solution that neutralizes the acidic eluate. Examples of the neutralizing agent include a sodium hydroxide solution and a sodium carbonate solution. The impurities may also be any substance, but examples include manganese, magnesium, and calcium.

[0044] The first processor 50 is supplied with the eluate produced in the adsorbent recovery device 42 from the adsorbent recovery device 42. A neutralizing agent is also supplied to the first processor 50 from a neutralizing agent storage tank 51. As a result, the neutralizing agent is added to the desorbent in the first processor 50, and the desorbent and neutralizing agent are mixed. As a result, a liquid desorbent mixed with the neutralizing agent and solid impurities precipitated by neutralization are produced in the first processor 50. The first processor 50 is provided with a filter that removes solid impurities by filtration, and the impurities are removed by passing the mixture of the desorbent and impurities through this filter. The desorbent from which the impurities have been removed (the desorbent mixed with the neutralizing agent and from which the impurities have been removed) is introduced into the concentrator 60.

[0045] (Concentrator) One end of the concentrator 60 is connected to the first processor 50, and the other end is connected to the second processor 70. The concentrator 60 concentrates the eluate treated by the first processor 50 to produce a concentrated liquid. That is, the concentrated liquid is a liquid obtained by concentrating the eluate containing the target component (in this embodiment, a liquid obtained by concentrating the eluate containing the target component and the desorbent mixed with a neutralizing agent and removing impurities). The concentrator 60 heats the eluate to remove at least a portion of the liquid components contained in the eluate to produce a concentrated liquid. The concentrator 60 may have a pressure semipermeable membrane. The concentrator 60 concentrates the eluate using the pressure semipermeable membrane to produce a concentrated liquid. In this way, the eluate can be concentrated to a high concentration.

[0046] In this embodiment, the concentrator 60 may be a tank that stores the eluate supplied from the first processor 50. The eluate in the concentrator 60 is heated and concentrated by a second heat exchanger 82, which will be described later.

[0047] (Second processor) The second processor 70 is a device that adds a separating agent to the concentrated liquid to perform a separation process to separate target components from the concentrated liquid. The second processor 70 is connected to the concentrator 60, a second waste liquid processor 72, and a target component collector 74. The second processor 70 may be a tank that stores the concentrated liquid supplied from the concentrator 60. The second processor 70 may also be connected to a separating agent storage tank 71 that supplies a separating agent to the second processor 70. The separating agent may be any substance that separates target components from the concentrated liquid, and may be, for example, sodium carbonate.

[0048] The second processor 70 is supplied with a concentrated liquid (concentrated eluate) from the concentrator 60. The second processor 70 is also supplied with a separating agent from a separating agent storage tank 71. The separating agent is added to the concentrated liquid in the second processor 70, and the concentrated liquid and the separating agent are mixed. This causes a solid recovered material containing the target component to precipitate, and a concentrated liquid from which the target component has been separated and a solid recovered material containing the target component are generated in the first processor 50. The first processor 50 is provided with a filter that removes the solid recovered material by filtration. The mixture of the concentrated liquid and the recovered material is passed through the filter to recover the recovered material. The recovered material is supplied to a target component recovery device 74. For example, in this embodiment, sodium carbonate is added as a separating agent, and lithium carbonate is obtained as the recovered material. The concentrated liquid from which the recovered material has been separated is supplied to a second waste liquid treatment device 72 for treatment.

[0049] (Control unit) The control unit 90 is a computing device equipped with a CPU (Central Processing Unit) and a storage device. The control unit 90 is connected to the gas treatment device 24, the mixing tank 26, the adsorbent separation device 28, the adsorption device 30, the solid-liquid separation device 40, the adsorbent recovery device 42, the first wastewater treatment device 43, the first treatment device 50, the concentrator 60, the second treatment device 70, the second wastewater treatment device 72, the target component recovery device 74, and the pump P. The control unit 90 controls the functions of the connected devices. For example, the control unit 90 is also connected to the neutralizing agent storage tank 51 and the separating agent storage tank 71. The control unit 90 controls, for example, the amount of the mixed liquid in the mixing tank 26 and controls the supply amount of the adsorbent and the electrobacteria based on the amount of the mixed liquid.

[0050] <Processing flow> A description will be given of a processing flow related to the above-described target component recovery system 1. Fig. 3 is a flowchart showing an example of a target component recovery method of the target component recovery system according to the first embodiment.

[0051] The target component recovery system 1 supplies the adsorbent and the electric bacteria to the mixing tank 26 (step S10). Specifically, the adsorbent storage tank 20 and the electric bacteria storage tank 22 respectively supply the adsorbent and the electric bacteria to the mixing tank 26. Seawater is taken in from the sea S. Specifically, the water intake facility 10 takes in seawater from the sea S.

[0052] The target component recovery system 1 mixes the adsorbent and the electric bacteria to generate a mixed solution (step S12). Specifically, the mixing tank 26 generates a mixed solution in which the adsorbent and the electric bacteria are mixed.

[0053] The target component recovery system 1 separates the adsorbent (step S14). Specifically, the adsorbent separation device 28 separates the adsorbent from the mixed liquid.

[0054] The target component recovery system 1 takes in the solution (step S16). Specifically, the water intake facility 10 takes in seawater.

[0055] The target component recovery system 1 mixes the adsorbent with the solution to generate an adsorption liquid (step S18). Specifically, the adsorption device 30 adds an adsorbent that adsorbs the target components contained in the taken-in seawater to the seawater to generate an adsorption liquid.

[0056] The target component recovery system 1 generates a desorbed liquid by adding a desorbent to the adsorbing liquid (step S20). Specifically, the adsorbent recovery device 42 adds a desorbent to the adsorbing liquid, desorbs the target component from the adsorbing liquid, and generates a desorbed liquid.

[0057] The target component recovery system 1 removes impurities (step S22). Specifically, the first processor 50 removes impurities from the eluate by adding a neutralizing agent, and then performs a filtration process.

[0058] The target component recovery system 1 produces a concentrated liquid (step S24). Specifically, the concentrator 60 concentrates the eluate treated by the first processor 50 to produce a concentrated liquid. At this time, the second heat exchanger 82 exchanges heat between the eluate and the waste heat medium from the plant 100 to heat the eluate. Also, at this time, the second heat exchanger 82 heats the eluate to a temperature higher than that heated by the first heat exchanger 80.

[0059] The target component recovery system 1 performs a separation process (step S26). A separating agent is added to the concentrated liquid, and a separation process is performed to separate the target components.

[0060] The target component recovery system 1 recovers the target component (step S28). Specifically, the target component recoverer 74 recovers the separated target component (resource).

[0061] In the above example, the target component recovery system 1 takes in the solution in step S16, but it may also take in seawater in step S14. Specifically, the target component recovery system 1 may take in seawater using the water intake facility 10, then supply the adsorbent and electrobacteria to the mixing tank 26, mix them, and produce the adsorption liquid in the adsorption device 30.

[0062] As described above, the target component recovery system 1 according to this embodiment includes an adsorbent storage tank 20 for storing an adsorbent that adsorbs target components in a solution (seawater), an electrobacteria storage tank 22 for storing electrobacteria that assist adsorption by the adsorbent, a mixing tank 26 for mixing the adsorbent and electrobacteria, an adsorption device 30 that adds the adsorbent mixed with the electrobacteria in the mixing tank 26 to the solution to produce an adsorption liquid containing the solution and the adsorbent, a solid-liquid separation device 40 that separates the adsorbent from the adsorption liquid, and an adsorbent recovery device 42 that desorbs the target components from the adsorbent. Since the electrobacteria and the adsorbent are mixed in the mixing tank 26, the adsorption efficiency of the adsorbent can be improved.

[0063] The target component recovery system 1 also includes an adsorbent separation device 28 that is connected to the mixing tank 26, separates the adsorbent from the mixed liquid mixed with the electrobacteria in the mixing tank 26, and supplies the separated adsorbent to the adsorption device 30. This makes it possible to separate the adsorbent, and prevents the electrobacteria and bait from being discharged into the sea S. In other words, this also contributes to environmental considerations.

[0064] Second Embodiment 4 is a schematic diagram showing the overall configuration of a target component recovery system according to a second embodiment. In this embodiment, the recovery efficiency of lithium, which is the target component, is improved by heating the adsorption solution and the like using exhaust heat from the plant 100. In the second embodiment, components similar to those in the first embodiment are designated by the same reference numerals, and detailed descriptions thereof will be omitted.

[0065] The target component recovery system 1A includes a plant 100, a water intake facility 10, an adsorbent storage tank 20, an electrobacterial storage tank 22, a gas treatment device 24, a mixing tank 26, an adsorbent separation device 28, an adsorption device 30, a solid-liquid separation device 40, an adsorbent recovery device 42, a first wastewater treatment device 43, a first treatment device 50, a concentrator 60, a second treatment device 70, a second wastewater treatment device 72, a target component recovery device 74, a first heat exchanger 81, a second heat exchanger 82, and a control unit 90A. The target component recovery system 1A is a system that recovers a target component (resource) contained in a solution by performing a predetermined process.

[0066] (heat exchanger) The temperature of seawater taken from the water intake facility 10 is not always constant due to seasonal and other factors. Therefore, the temperature of the seawater may become low, and even if an adsorbent is added, the recovery efficiency of the target component may decrease. Furthermore, when recovering a target component from the eluent containing the target component, the recovery efficiency of the target component may decrease if the eluent is not sufficiently concentrated. In contrast, in this embodiment, the first heat exchanger 80 and the second heat exchanger 82 are used to heat the seawater and the eluent, thereby suppressing a decrease in the recovery efficiency of the target component and enabling the target component to be appropriately recovered. The first heat exchanger 80 and the second heat exchanger 82 are described below.

[0067] (1st heat exchanger) The first heat exchanger 80 heats the seawater taken in by the water intake facility 10 by exchanging heat between the waste heat medium from the plant 100 and the seawater taken in by the water intake facility 10. The first heat exchanger 80 is connected to a pipe through which the waste heat medium from the plant 100 flows, and the waste heat medium is supplied from the pipe. The first heat exchanger 80 is also disposed in a position where it can heat the seawater taken in by the water intake facility 10. This allows the first heat exchanger 80 to heat the seawater taken in by the water intake facility 10 using the waste heat medium from the plant 100. Here, the seawater taken in by the water intake facility 10 refers to the seawater (or the adsorption liquid) after it has been taken in by the water intake facility 10 and before it is supplied to the solid-liquid separation device 40. In other words, the first heat exchanger 80 heats the seawater (or the adsorption liquid) between the position where the water intake facility 10 is provided and the position where the solid-liquid separation device 40 is provided, in the direction in which the seawater (or the adsorption liquid) flows within the target component recovery system 1A. It is more preferable that the first heat exchanger 80 heats the seawater (or the adsorption liquid) after it has been discharged from the condenser 101 and before it is supplied to the solid-liquid separation device 40. By heating the elution liquid with the first heat exchanger 80 in this way, the seawater can be appropriately heated using the exhaust heat from the plant 100, and the target components can be appropriately recovered.

[0068] In this embodiment, the first heat exchanger 80 preferably heats the seawater (adsorption liquid) in the adsorption device 30. That is, the first heat exchanger 80 is disposed at a position where it can heat the seawater in the adsorption device 30. For example, the first heat exchanger 80 is disposed within a predetermined distance from the adsorption device 30 (within a distance range where the seawater in the adsorption device 30 can be heated). For example, the first heat exchanger 80 may be disposed at a position where it contacts the outer wall of the adsorption device 30, or may be disposed inside the adsorption device 30.

[0069] The first heat exchanger 80 preferably heats the seawater taken in by the water intake facility 10 (the seawater in the adsorption device 30 in this example) to maintain the temperature of the seawater within an appropriate temperature range. The appropriate temperature range of the seawater here may be set as appropriate. For example, the first heat exchanger 80 controls the degree of heating according to the flow rate of seawater taken in by the pump P to heat the seawater so as to maintain the temperature range of the seawater. For example, the first heat exchanger 80 may be provided with a valve capable of controlling the amount of exhaust heat medium supplied to the first heat exchanger 80, and the control unit 90 may control the opening and closing of the valve according to the flow rate of seawater taken in by the pump P to control the amount of exhaust heat medium supplied and thereby the degree of heating. Furthermore, for example, if the exhaust heat medium is discharged from multiple locations in the plant 100, the first heat exchanger 80 may be connectable to pipes from each of the locations in the plant 100. In this case, for example, the control unit 90A selects a pipe to connect to the first heat exchanger 80 from the pipes from each location in the plant 100 according to the flow rate of seawater taken in by the pump P, and connects the selected pipe to the first heat exchanger 80. This makes it possible to supply an exhaust heat medium having a heat quantity according to the flow rate of seawater, and to heat the seawater appropriately.

[0070] The first heat exchanger 80 is not limited to heating the seawater in the adsorption device 30, and may, for example, heat the seawater flowing through the pipe (discharge channel) 16 connecting the water intake facility 10 and the adsorption device 30. In this case, the first heat exchanger 80 is disposed at a position where it can heat the seawater in the discharge channel 16. For example, the first heat exchanger 80 is disposed within a predetermined distance from the discharge channel 16 (within a distance range where the seawater in the discharge channel 16 can be heated). For example, the first heat exchanger 80 may be disposed at a position where it contacts the outer peripheral surface of the discharge channel 16.

[0071] Furthermore, a plurality of first heat exchangers may be provided. In this case, for example, a first heat exchanger 80 that heats the seawater (adsorption liquid) in the adsorption device 30 and a first heat exchanger 80 that heats the seawater in the discharge channel 16 may be provided.

[0072] (Second heat exchanger) The second heat exchanger 82 heats the eluate by exchanging heat between the waste heat medium from the plant 100 and the eluate. The second heat exchanger 82 is connected to a pipe through which the waste heat medium from the plant 100 flows, and the waste heat medium is supplied from the pipe. The second heat exchanger 82 is also disposed in a position where it can heat the eluate. This allows the second heat exchanger 82 to heat the eluate using the waste heat medium from the plant 100. The eluate here refers to the eluate after the target components have been captured by the adsorbent recovery device 42. That is, the second heat exchanger 82 heats the eluate between the position where the adsorbent recovery device 42 is provided and the position where the concentrator 60 is provided, in the direction of flow of the eluate within the target component recovery system 1A. In this way, by heating the eluate using the second heat exchanger 82, the eluate can be appropriately concentrated using the waste heat from the plant 100, allowing the target components to be appropriately recovered.

[0073] In this embodiment, the second heat exchanger 82 preferably heats the eluent in the concentrator 60. That is, the second heat exchanger 82 is disposed at a position where it can heat the eluent in the concentrator 60. For example, the second heat exchanger 82 is disposed within a predetermined distance from the concentrator 60 (within a distance range where the eluent in the concentrator 60 can be heated). For example, the second heat exchanger 82 may be disposed at a position where it contacts the outer wall of the concentrator 60, or may be disposed within the concentrator 60.

[0074] The second heat exchanger 82 preferably heats the desorbent to maintain the temperature of the desorbent within an appropriate temperature range. The appropriate temperature range of the desorbent may be set as appropriate, but is higher than the appropriate temperature range of seawater described above. For example, the second heat exchanger 82 controls the degree of heating according to the flow rate of seawater taken in by the pump P to heat the desorbent so as to maintain the appropriate temperature range. For example, the second heat exchanger 82 may be provided with a valve capable of controlling the amount of exhaust heat medium supplied to the second heat exchanger 82, and the control unit 90 may control the supply amount of exhaust heat medium and the degree of heating by controlling the opening and closing of the valve according to the flow rate of seawater taken in by the pump P. Furthermore, for example, if the exhaust heat medium is discharged from multiple locations in the plant 100, the second heat exchanger 82 may be connectable to pipes from each of the locations in the plant 100. In this case, for example, the control unit 90 selects a pipe to be connected to the second heat exchanger 82 from among pipes from various locations in the plant 100, depending on the flow rate of seawater taken in by the pump P, and connects the selected pipe to the second heat exchanger 82. This makes it possible to supply an exhaust heat medium having a heat quantity according to the flow rate of seawater, and to appropriately heat the desorbent.

[0075] (1st and 2nd heat exchangers) The second heat exchanger 82 heats the desorbent to a higher temperature than the first heat exchanger 80. In other words, the temperature of the desorbent heated by the second heat exchanger 82 is higher than the temperature of the seawater heated by the first heat exchanger 80. This allows the seawater to be appropriately heated to improve the adsorption efficiency of the target components, while the desorbent can be heated to a higher temperature to sufficiently concentrate the desorbent, allowing the target components to be appropriately recovered.

[0076] The first heat exchanger 80 and the second heat exchanger 82 may exchange heat using a waste heat medium from any location in the plant 100; for example, the waste heat medium may be supplied to each of them from different locations in the plant 100. However, in this embodiment, it is preferable that the first heat exchanger 80 and the second heat exchanger 82 exchange heat using a waste heat medium supplied from the same location in the plant 100. In this case, the second heat exchanger 82 is supplied with the waste heat medium from the plant 100, and the second heat exchanger 82 exchanges heat using the supplied waste heat medium. The first heat exchanger 80 is supplied with the waste heat medium after heat exchange in the second heat exchanger 82, and the first heat exchanger 80 exchanges heat using the waste heat medium after heat exchange in the second heat exchanger 82. In this case, for example, the target component recovery system 1A is provided with a first pipe connecting the first heat exchanger 80 and the second heat exchanger 82, and a second pipe connecting a point where the waste heat medium from the plant 100 is discharged to the second heat exchanger 82. The waste heat medium from the plant 100 is supplied to the second heat exchanger 82 through the second pipe and undergoes heat exchange with the desorbent. After exchanging heat with the desorbent in the second heat exchanger 82, the waste heat medium is supplied to the first heat exchanger 80 through the first pipe and undergoes heat exchange with seawater. In this way, by the first heat exchanger 80 performing heat exchange using the waste heat medium after heat exchange in the second heat exchanger 82, it is possible to appropriately heat the seawater to improve the adsorption efficiency of the target component, while sufficiently concentrating the desorbent and appropriately recovering the target component.

[0077] (Control unit) The control unit 90A is a computing device equipped with a CPU (Central Processing Unit) and a storage device. The control unit 90A is connected to the gas treatment device 24, the mixing tank 26, the adsorbent separation device 28, the adsorption device 30, the solid-liquid separation device 40, the adsorbent recovery device 42, the first wastewater treatment device 43, the first treatment device 50, the concentrator 60, the second treatment device 70, the second wastewater treatment device 72, the target component recovery device 74, the first heat exchanger 80, the second heat exchanger 82, and the pump P. The control unit 90A controls the functions of the connected devices. For example, the control unit 90A controls the heat exchange (exhaust heat) by the first heat exchanger 80 and the second heat exchanger 82. The control unit 90A is also connected to the adsorbent storage tank 20, the electrobacteria storage tank 22, the desorbent storage tank 41, the neutralizing agent storage tank 51, and the separating agent storage tank 71. The control unit 90A controls, for example, the amount of the mixed liquid in the mixing tank 26, and controls the supply amounts of the adsorbent and the electrobacteria based on the amount of the mixed liquid.

[0078] In this embodiment, the target component recovery system 1A does not have to use electrobacteria. In this case, the adsorbent storage tank 20 is connected to the adsorption device 30, and the adsorbent is supplied to the adsorption device 30 without being mixed with electrobacteria. In this way, even if the target component recovery system 1A does not use electrobacteria, it can properly recover target components contained in seawater by performing heat exchange using the first heat exchanger 80 and the second heat exchanger 82.

[0079] <Effects> The target component recovery system according to the first aspect of the present disclosure includes an adsorbent storage tank 20 for storing an adsorbent that adsorbs target components in a solution, an electrobacteria storage tank 22 for storing electrobacteria that assist adsorption by the adsorbent, a mixing tank 26 for mixing the adsorbent and electrobacteria, an adsorption device 30 that adds the adsorbent mixed with the electrobacteria in the mixing tank 26 to the solution to produce an adsorption solution containing the solution and the adsorbent, a solid-liquid separation device 40 that separates the adsorbent from the adsorption solution, and an adsorbent recovery device 42 that desorbs the target components from the adsorbent. This allows the electrobacteria to be utilized, thereby enabling the target components contained in seawater to be appropriately recovered.

[0080] A target component recovery system according to a second aspect of the present disclosure is the target component recovery system according to the first aspect, further comprising an adsorbent separation device 28 connected to the mixing tank 26, which separates the adsorbent from the mixed solution mixed with electrobacteria in the mixing tank 26, and supplies the separated adsorbent to the adsorption device 30. This increases the adsorption efficiency of the adsorbent, allowing the target component contained in seawater to be efficiently recovered.

[0081] A target component recovery system according to a third aspect of the present disclosure is the target component recovery system according to the first or second aspect, further comprising a food storage tank 22a that stores food for the electrobacteria and adds the food to the electrobacteria. This also makes it possible to culture the electrobacteria in the electrobacteria storage tank 22. Therefore, target components contained in seawater can be efficiently recovered.

[0082] A target component recovery system according to a fourth aspect of the present disclosure is the target component recovery system according to any one of the first to third aspects, further comprising a gas treatment device 24 that removes oxygen from a liquid containing an adsorbent to be added to the adsorption liquid. This prevents oxidation of the adsorbent and allows the target component contained in seawater to be properly recovered.

[0083] A target component recovery system according to a fifth aspect of the present disclosure is the target component recovery system according to any one of the first to fourth aspects, and further includes a control unit 90 that adjusts the amount of adsorbent and the amount of electrobacteria added to the mixing tank 26. This makes it possible to prevent the use of large amounts of adsorbent and electrobacteria.

[0084] A target component recovery system according to a sixth aspect of the present disclosure is the target component recovery system according to any one of the first to fifth aspects, and further includes a water intake facility 10 used in a plant 100 that takes in a solution, a first heat exchanger 81 that exchanges heat between the taken-in solution and a heat transfer medium from the plant 100 to heat the solution, and a second heat exchanger 82 that exchanges heat between a desorbent that has desorbed the target component from the adsorption solution and a desorbent containing the target component and the desorbent, and the heat transfer medium from the plant 100 to heat the desorbent, the second heat exchanger 82 heating the desorbent to a temperature higher than that heated by the first heat exchanger 81. In this manner, the target component contained in seawater can be appropriately recovered.

[0085] A target component recovery system according to a seventh aspect of the present disclosure is the target component recovery system according to the sixth aspect, in which the first heat exchanger 81 exchanges heat between the solution in the adsorption device 30 and the exhaust heat medium from the plant 100 to heat the solution in the adsorption device 30. In this way, the target component contained in seawater can be appropriately recovered.

[0086] A target component recovery system according to an eighth aspect of the present disclosure is the target component recovery system according to the sixth or seventh aspect, in which the first heat exchanger 81 maintains the temperature of the solution within an appropriate temperature range by heating the solution in the adsorption device 30. In this way, the target component contained in seawater can be appropriately recovered.

[0087] A target component recovery system according to a ninth aspect of the present disclosure is the target component recovery system according to any one of the sixth to eighth aspects, in which the first heat exchanger 81 heats the solution with the exhaust heat medium after heat exchange in the second heat exchanger 82. In this way, the target component contained in seawater can be appropriately recovered.

[0088] A target component recovery system according to a tenth aspect of the present disclosure is the target component recovery system according to any one of the sixth to ninth aspects, in which the first heat exchanger 81 and the second heat exchanger 82 exchange heat using exhaust heat medium from multiple locations in the plant 100. In this way, the target component contained in seawater can be appropriately recovered.

[0089] A target component recovery system according to an eleventh aspect of the present disclosure is the target component recovery system according to the first or second aspect, wherein the target component is either lithium or magnesium, and thus either lithium or magnesium can be appropriately recovered.

[0090] A target component recovery system according to a twelfth aspect of the present disclosure is the target component recovery system according to the first or second aspect, in which the solution is seawater, concentrated wastewater from a seawater desalination plant, or brine from a salt lake, and therefore can appropriately recover target components contained in these waters.

[0091] A target component recovery method according to a thirteenth aspect of the present disclosure includes the steps of: storing an adsorbent that adsorbs a target component in a solution; storing electrobacteria that assist the adsorption of the adsorbent; mixing the adsorbent and the electrobacteria; adding the adsorbent mixed with the electrobacteria in the mixing step to a solution to generate an adsorption solution containing the solution and the adsorbent; and desorbing the target component from the adsorption solution. Thus, the target component contained in seawater can be appropriately recovered.

[0092] A target component recovery method according to a thirteenth aspect of the present disclosure includes the steps of: taking in seawater from a water intake facility 10 used in a plant 100; adding an adsorbent that adsorbs a target component contained in the seawater to the seawater taken in by the water intake facility 10 to produce an adsorption solution containing seawater and the adsorbent; adding a desorbent to the adsorption solution to desorb the target component from the adsorption solution to produce a elution solution containing the desorbent and the target component; exchanging heat between the taken in seawater and a waste heat medium from the plant to heat the seawater; and exchanging heat between the elution solution and a waste heat medium from the plant 100 to heat the elution solution. In the step of heating the elution solution, the elution solution is heated to a higher temperature than in the step of heating seawater. This allows the plant's waste heat medium to be used, thereby reducing costs. Therefore, the target component contained in the seawater can be appropriately recovered. [Explanation of symbols]

[0093] 1. 1A Target Component Recovery System 10 Water intake equipment 12 Intake channel 14 screens 16 Spillway 20. Adsorbent storage tank 22 Electric Bacteria Storage Tank 22a Feed storage tank 24 Gas treatment equipment 26 Mixing Tank 28 Adsorbent Separator 30 Adsorption device 40 Solid-liquid separator 42 Adsorbent recovery device 43 First waste liquid treatment unit 50 First processor 60 Concentrator 70 Second processor 72 Second waste liquid treatment unit 74 Target Component Collector 80 1st heat exchanger 82 Second heat exchanger 90, 90A control section 100 plants 101 Condenser 101a Steam flow path 101b Return Channel

Claims

1. an adsorbent storage tank for storing an adsorbent that adsorbs the target component in the solution; an electric bacteria storage tank for storing electric bacteria that assist the adsorption of the adsorbent; a mixing tank for mixing the adsorbent and the electrobacteria; an adsorption device that adds the adsorbent mixed with the electrobacteria in the mixing tank to the solution to produce an adsorption solution containing the solution and the adsorbent; a solid-liquid separator that separates the adsorbent from the adsorption liquid; an adsorbent recovery device that desorbs the target component from the adsorbent; A target component recovery system comprising:

2. Further provided is an adsorbent separation device connected to the mixing tank, which separates the adsorbent from the mixed solution mixed with the electrobacteria in the mixing tank, and supplies the separated adsorbent to the adsorption device. The target component recovery system according to claim 1 .

3. Further provided is a food storage tank for storing food for the electric bacteria and adding the food to the electric bacteria. The target component recovery system according to claim 1 or 2.

4. The method further includes a gas treatment device for removing oxygen from a liquid containing an adsorbent to be added to the adsorption liquid. The target component recovery system according to claim 1 or 2.

5. Further provided is a control unit that adjusts the amount of the adsorbent and the amount of the electrobacteria added to the mixing tank. The target component recovery system according to claim 1 or 2.

6. a water intake facility used in the plant for taking in the solution; a first heat exchanger that exchanges heat between the introduced solution and a waste heat medium from the plant to heat the solution; a second heat exchanger that exchanges heat between a desorbent that has desorbed the target component from the adsorption solution and a desorbed solution containing the target component and a waste heat medium from the plant to heat the desorbed solution; Furthermore, The second heat exchanger heats the desorbed liquid to a temperature higher than that heated by the first heat exchanger. The target component recovery system according to claim 1 or 2.

7. the first heat exchanger exchanges heat between the solution in the adsorption device and a waste heat medium from the plant to heat the solution in the adsorption device. The target component recovery system according to claim 6 .

8. The first heat exchanger heats the solution in the adsorption device to maintain the temperature of the solution within an appropriate temperature range. The target component recovery system according to claim 6 .

9. The first heat exchanger heats the solution with the exhaust heat medium after heat exchange in the second heat exchanger. The target component recovery system according to claim 6 .

10. the first heat exchanger and the second heat exchanger perform heat exchange using waste heat medium from a plurality of locations in the plant. The target component recovery system according to claim 6 .

11. The target component is either lithium or magnesium. The target component recovery system according to claim 1 or 2.

12. The solution is any one of seawater, concentrated wastewater from a seawater desalination plant, and salt lake brine; The target component recovery system according to claim 1 or 2.

13. storing an adsorbent that adsorbs a target component in a solution; storing electrobacteria that assist the adsorption of the adsorbent; mixing the adsorbent and the electrobacteria; adding the adsorbent mixed with the electrobacteria in the mixing step to the solution to generate an adsorption solution containing the solution and the adsorbent; separating the adsorbent from the adsorption liquid; desorbing the target component from the adsorbent; Including, Target component recovery method.

Images