Microbial electro-coupled remediation of heavy metals by permeable reactive barrier

Abstract

The present application discloses a kind of microbial electric coupling remediation heavy metal's permeation type reaction device, the permeation type reaction device includes power supply, electrode, liquid supply pipeline and liquid medicine storage tank component.At least one set of electrode is suitable for being arranged in the ground, and electrode includes anode and cathode;First flow passage is arranged in anode, and second flow passage is arranged in cathode.Liquid supply pipeline includes the first liquid supply pipeline that is communicated with first flow passage and the second liquid supply pipeline that is communicated with second flow passage.Liquid medicine storage tank component is suitable for being placed on the ground or being buried in the ground, and liquid medicine storage tank component at least includes first medicine tank and second medicine tank, first medicine tank is communicated with the liquid inlet end of first liquid supply pipeline and is used to accommodate anaerobic bacteria group and organic matter suitable for anaerobic microorganism growth, second medicine tank is communicated with the liquid inlet end of second liquid supply pipeline and is used to accommodate autotrophic bacteria group and organic matter suitable for autotrophic bacteria microorganism growth.The present application provides a kind of permeation type reaction device, improves pollutant processing capacity, and saves energy.

Description

Technical Field

[0001] This invention relates to the field of environmental remediation technology, and in particular to a permeation reaction device for the electrocoupling remediation of heavy metals by microorganisms. Background Technology

[0002] In-situ bioremediation is a process that restores soil and rivers by setting up reaction devices or adding microbial reagents, nutrients, and soil conditioners to enhance the degradation of organic pollutants in soil and rivers by native or exogenous microorganisms without altering the location of the soil or river.

[0003] Existing in-situ groundwater remediation electrode wells include an anode, an oxygen reduction cathode, and a gas chamber mounted on the oxygen reduction cathode. The anode and oxygen reduction cathode can be electrically connected to an external power source to provide power to the electrode well. The gas chamber is fixed to the oxygen reduction cathode to supply it with oxygen. Oxygen evolution occurs at the anode, releasing oxygen and increasing the dissolved oxygen concentration in the groundwater to some extent, thus promoting the oxidation of pollutants. However, the pollutant treatment capacity of this remediation device is relatively limited, especially when remediating soil or groundwater contaminated with high-value toxic heavy metals; in fact, this oxidation capacity may hinder the reduction of pollutants. Summary of the Invention

[0004] The main objective of this invention is to provide a permeable reaction device for microbial electrocoupling remediation of heavy metals, which aims to improve the ability to remediate heavy metal-contaminated soil or groundwater.

[0005] To achieve the above objectives, this invention proposes a permeation reaction device for microbial electrocoupling remediation of heavy metals, comprising:

[0006] power supply;

[0007] At least one set of electrodes, adapted to be installed underground, the electrodes including an anode and a cathode arranged opposite each other, the anode being electrically connected to the positive terminal of the power source and adapted to be installed upstream of the groundwater, the cathode being electrically connected to the negative terminal of the power source and adapted to be installed downstream of the groundwater; the anode has a first flow channel and the cathode has a second flow channel.

[0008] The liquid supply pipeline includes a first liquid supply pipeline communicating with the first flow channel and a second liquid supply pipeline communicating with the second flow channel; and

[0009] A liquid medicine storage tank assembly is suitable for placement above ground or burial underground. The liquid medicine storage tank assembly includes at least a first tank and a second tank. The first tank is connected to the inlet end of the first liquid supply pipeline and is used to contain organic matter for the growth of anaerobic bacteria and anaerobic microorganisms. The second tank is connected to the inlet end of the second liquid supply pipeline and is used to contain organic matter for the growth of aerobic autotrophic bacteria and aerobic autotrophic microorganisms.

[0010] Optionally, the microbial electrocoupling remediation device for heavy metals further includes an aeration supply component, which is connected to the second liquid supply pipeline to supply aeration to the cathode.

[0011] Optionally, both the anode and the cathode are porous carbon materials.

[0012] Optionally, both the anode and the cathode are provided with lifting rings for hoisting.

[0013] Optionally, the power source is a DC power source, and the magnitude of the DC power supply voltage is positively correlated with the distance between the anode and the cathode.

[0014] Optionally, for every 1 cm increase in the distance between the anode and the cathode, the supply voltage of the DC power supply increases by 0.1 to 1.0 V.

[0015] Optionally, the microbial electrocoupling remediation device for heavy metals further includes:

[0016] The controller is connected to the power supply and the drug storage tank assembly, respectively; and

[0017] A detection component, connected to the controller, includes a heavy metal concentration monitor, a conductivity meter, and a water quality parameter meter; the detection component is used to detect the heavy metal concentration, conductivity, or various water quality parameters of groundwater and send detection signals to the controller.

[0018] The controller is used to automatically determine and control the operation of the power supply and the medicine storage tank assembly based on the detection signal.

[0019] Optionally, the drug storage tank assembly further includes a third tank for containing the reducing solution, the third tank being connected to the supply pipeline and electrically connected to the controller; the controller is further configured to control the third tank to inject the reducing solution into all the electrodes when the detected groundwater conductivity is less than a preset conductivity.

[0020] Optionally, the reducing solution is ferrous sulfate or calcium polysulfide.

[0021] Optionally, the permeation reaction device for microbial electrocoupling remediation of heavy metals further includes a solar panel and a battery, wherein the solar panel is electrically connected to the battery and is adapted to be exposed to sunlight, and the battery is electrically connected to the power source.

[0022] In the technical solution of this invention, the microbial electrocoupling remediation device for heavy metals includes a power source, electrodes, a liquid supply pipeline, and a drug storage tank assembly. At least one set of electrodes is suitable for underground installation. Each electrode includes an anode and a cathode arranged opposite each other. The anode is electrically connected to the positive terminal of the power source and is suitable for installation upstream of the groundwater. The cathode is electrically connected to the negative terminal of the power source and is suitable for installation downstream of the groundwater. A first flow channel is provided within the anode, and a second flow channel is provided within the cathode. The liquid supply pipeline includes a first supply pipeline connected to the first flow channel and a second supply pipeline connected to the second flow channel. The drug storage tank assembly is suitable for placement above ground or burial underground. The drug storage tank assembly includes at least a first tank and a second tank. The first tank is connected to the inlet end of the first supply pipeline and is used to contain organic matter for the growth of anaerobic bacteria and anaerobic microorganisms. The second tank is connected to the inlet end of the second supply pipeline and is used to contain organic matter for the growth of aerobic autotrophic bacteria and aerobic autotrophic microorganisms. Both the anode and the cathode can be made of porous carbon materials.

[0023] It is understandable that the anode is located upstream of the groundwater and the cathode is located downstream of the groundwater. The groundwater can flow through the pores of porous carbon, where it is treated and rendered harmless by electrical or microbial action before flowing downstream.

[0024] The principle is that, due to the electric field, high-valence heavy metals accumulate at the anode. Under the action of the electrode, these high-valence heavy metals lose electrons and are reduced to low-valence heavy metals, eliminating their mobility and pathogenicity. At the same time, due to the electric field, anaerobic bacteria also accumulate at the anode. The anaerobic bacteria proliferate in the porous carbon anode, reducing high-valence heavy metals and synergistically treating pollutants. Due to the electric field, aerobic autotrophic microorganisms accumulate at the cathode, trapping the remaining pollutants at the anode. The aerobic autotrophic microorganisms proliferate in the porous carbon electrode, further reducing high-valence heavy metals.

[0025] This invention improves the ability to remediate heavy metal-contaminated soil or groundwater by injecting anaerobic bacteria and organic matter suitable for the growth of anaerobic microorganisms into the anode, thereby enhancing the pollutant treatment capacity.

[0026] This invention effectively increases the number and proliferation rate of microorganisms by introducing aeration, aerobic autotrophic bacteria, and organic matter for the growth of aerobic autotrophic microorganisms into the cathode, thereby further improving the pollutant treatment capacity.

[0027] Furthermore, the permeation reaction device of the present invention can automatically monitor the conductivity of groundwater. When the detected groundwater conductivity is less than the preset conductivity, a reducing agent is injected into all electrodes. On the one hand, this improves the conductivity, and on the other hand, the reducing agent itself also has the effect of reducing and repairing high-priced toxic heavy metals. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a permeation reaction device for microbial electrocoupling remediation of heavy metals according to an embodiment of the present invention.

[0030] Figure 2 This is an exploded view of an embodiment of the permeation reaction device for microbial electrocoupling remediation of heavy metals according to the present invention;

[0031] Figure 3 This is a schematic diagram of the electrode structure in one embodiment of the permeation reaction device for microbial electrocoupling remediation of heavy metals according to the present invention.

[0032] Explanation of icon numbers:

[0033] 10. Power supply; 20. Electrode; 30. Liquid supply pipeline; 40. Liquid storage tank assembly; 21. Anode; 22. Cathode; 201. Power and signal lines; 211. First flow channel; 221. Second flow channel; 31. First liquid supply pipeline; 32. Second liquid supply pipeline; 41. First medicine tank; 42. Second medicine tank; 43. Third medicine tank; 44. Aeration supply assembly; 202. Hanging ring; 50. Controller; 60. Frame; 70. Solar panel.

[0034] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0037] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0038] This invention proposes a permeation reaction device for the electrocoupling remediation of heavy metals by microorganisms.

[0039] Reference Figures 1 to 3 In one embodiment of the present invention, the microbial electrocoupling remediation device for heavy metals includes a power supply 10, electrodes 20, a liquid supply pipeline 30, and a drug storage tank assembly 40; at least one set of electrodes 20 is adapted to be installed underground, and each electrode 20 includes an anode 21 and a cathode 22 arranged opposite to each other. The anode 21 is connected to the positive terminal of the power supply 10 via a power line and is adapted to be installed upstream of the groundwater, and the cathode 22 is connected to the negative terminal of the power supply 10 via a power line and is adapted to be installed downstream of the groundwater; the anode 21 has a first flow channel 211, and the cathode 22 has a second flow channel 211. 21; The liquid supply pipeline 30 includes a first liquid supply pipeline 31 connected to the first flow channel 211 and a second liquid supply pipeline 32 connected to the second flow channel 221; The liquid storage tank assembly 40 is suitable for being placed on the ground or buried underground. The liquid storage tank assembly 40 includes at least a first tank 41 and a second tank 42. The first tank 41 is connected to the inlet end of the first liquid supply pipeline 31 and is used to contain organic matter for the growth of anaerobic bacteria and anaerobic microorganisms. The second tank 42 is connected to the inlet end of the second liquid supply pipeline 32 and is used to contain organic matter for the growth of aerobic autotrophic bacteria and aerobic autotrophic microorganisms.

[0040] In this embodiment, both the first medicine container 41 and the second medicine container 42 can be ordinary liquid storage containers or intelligent drug delivery devices with automatic drug delivery function, and there is no limitation here.

[0041] In this embodiment, the anode 21 is located upstream of the groundwater, and the cathode 22 is located downstream of the groundwater. The groundwater can flow through the pores of porous carbon, where it is treated and rendered harmless by electrical or microbial action before flowing downstream.

[0042] Both the anode 21 and the cathode 22 can be made of porous carbon material. In this embodiment, the outer side of the whole consisting of all electrodes 20 can be covered with a shell, and the shell can have inlet and outlet ports or holes.

[0043] The principle is that, due to the electric field, high-valence heavy metals will accumulate in the anode 21. Under the action of the electrode 20, the high-valence heavy metals lose electrons and are reduced to low-valence heavy metals, eliminating their migration and pathogenicity. At the same time, due to the electric field, anaerobic bacteria will also accumulate in the anode 21. The anaerobic bacteria will proliferate in the porous carbon anode 21, reducing the high-valence heavy metals and synergistically treating pollutants. Due to the electric field, aerobic autotrophic microorganisms will accumulate in the cathode 22, trapping the remaining pollutants in the anode 21. The aerobic autotrophic microorganisms will proliferate in the porous carbon electrode 20, further reducing the high-valence heavy metals.

[0044] This invention improves the ability to remediate heavy metal contaminated soil or groundwater by injecting anaerobic bacteria and organic matter suitable for the growth of anaerobic microorganisms into the anode 21, thereby enhancing the pollutant treatment capacity.

[0045] Furthermore, by injecting aerobic autotrophic bacteria and organic matter for the growth of aerobic autotrophic microorganisms into the cathode 22, the present invention effectively increases the number and proliferation rate of microorganisms, thereby further improving the pollutant treatment capacity.

[0046] To further increase the number and proliferation rate of microorganisms at the 22 cathode sites, refer to Figure 1 and Figure 2 In one embodiment, the microbial electrocoupling remediation device for heavy metals may further include an aeration supply component 44, which is connected to a second liquid supply pipeline 32 to supply aeration to the cathode 22.

[0047] In this embodiment, the aeration supply component 44 can be a regular air storage tank or an intelligent air supply device with automatic air delivery function, and is not limited here.

[0048] It should be noted that in the sewage treatment process, certain methods and equipment are used to forcibly introduce air into the sewage, so that the sewage in the pool comes into contact with the air and is oxygenated. This also agitates the liquid, accelerates the transfer of oxygen from the air into the liquid, prevents suspended objects in the pool from settling, and enhances the contact between organic matter, microorganisms, and dissolved oxygen in the pool, thereby oxidizing and decomposing the organic matter in the sewage. This process of forcibly oxygenating sewage is called aeration.

[0049] This invention further enhances the number and proliferation rate of microorganisms by introducing aeration and injecting aerobic autotrophic bacteria and organic matter for their growth into the cathode 22, thereby greatly improving the pollutant treatment capacity.

[0050] To improve the convenience of construction, refer to Figure 2 In one embodiment, both the anode 21 and the cathode 22 may be provided with lifting rings 202 for hoisting.

[0051] In this embodiment, anchor points are provided around both the anode 21 and the cathode 22 to facilitate lifting, installation, or replacement. The microbial electrocoupling remediation device for heavy metals of the present invention is removable and can be fully reused.

[0052] To improve the automation level of this microbial electrocoupling remediation device for heavy metals, thereby enhancing pollutant treatment efficiency and saving energy, reference was made to... Figure 1 and Figure 2 In one embodiment, the microbial electrocoupling remediation device for heavy metals may further include a controller 50 and a detection component; the controller 50 is connected to the power supply 10 and the drug storage tank assembly 40 respectively; the detection component is connected to the controller 50 and includes a heavy metal concentration monitor, a conductivity meter, and a water quality parameter meter; the detection component is used to detect the heavy metal concentration, conductivity, or various water quality parameters in groundwater and send detection signals to the controller 50; the controller 50 is used to automatically determine and control the operation of the power supply 10 and the drug storage tank assembly 40 based on the detection signals.

[0053] The permeation reaction device of the present invention has a modular structure and a control module, which can operate automatically throughout the entire process. It can automatically determine whether it is necessary to inject bacteria, organic matter and aeration based on the data of the detection system.

[0054] In this embodiment, the controller 50 can be a microcontroller, DSP, FPGA, etc., and is not limited here.

[0055] Reference Figure 1 In this embodiment, the cable may include a power line and a signal line 201, wherein the power line is used to connect the electrode 20 to the power supply 10, and the signal line is used to connect the controller 50 to the detection component inside the electrode 20.

[0056] To further enhance the environmental remediation capabilities of this microbial electrocoupling remediation device for heavy metals, referring to Figure 1 and Figure 2 In one embodiment, the drug storage tank assembly 40 may further include a third drug tank 43 for containing the reducing solution. The third drug tank 43 is connected to the liquid supply pipeline 30 and electrically connected to the controller 50. The controller 50 is also used to control the third drug tank 43 to inject the reducing solution into the groundwater when the detected groundwater conductivity is less than a preset conductivity.

[0057] In this embodiment, the reducing solution can be ferrous sulfate or calcium polysulfide, etc., and is not limited here. Both ferrous sulfate and calcium polysulfide are soluble salts that can improve conductivity and effectively remove heavy metal pollutants from soil, groundwater, and wastewater.

[0058] For sites with low groundwater conductivity, this microbial electrocoupling remediation device for heavy metals can automatically monitor conductivity. When conductivity decreases, the system automatically injects solutions such as ferrous sulfate or calcium polysulfide, which can improve the conductivity and further enhance the treatment effect of pollutants.

[0059] The permeation reaction device of the present invention can automatically monitor the conductivity of groundwater. When the detected conductivity of groundwater is less than the preset conductivity, a reducing solution is injected into all electrodes 20. On the one hand, the conductivity is improved, and on the other hand, the reducing solution itself also has the function of reducing and repairing high-valence toxic heavy metals.

[0060] To fully utilize solar energy and save energy, refer to Figure 1 and Figure 2 In one embodiment, the permeation reaction device for microbial electrocoupling remediation of heavy metals may further include a solar panel 70 and a battery, wherein the solar panel 70 is electrically connected to the battery and is adapted to be exposed to sunlight, and the battery is electrically connected to a power source 10.

[0061] This invention achieves energy self-sufficiency and zero carbon emissions by covering the surface of the permeation reaction device with solar panels 70.

[0062] In this embodiment, the microbial electrocoupling remediation device for heavy metals can be equipped with a frame 60 for mounting the drug storage tank assembly 40 and the solar panel 70, etc. Of course, the frame 60 can be omitted, and the drug storage tank assembly 40 and the solar panel 70 can be directly fixed to the ground, or the drug storage tank assembly 40 can be buried underground, or both can be fixed to other supporting components; there are no limitations here.

[0063] Main reference Figure 2 In this embodiment, the frame 60 can be configured as a plate-like wall structure with an opening in the middle, the solar panel 70 can be covered on the opening, and the electrode 20 assembly can be arranged corresponding to the opening. On the one hand, the frame 60 can serve as a support for the solar panel 70, the battery, and the liquid storage tank assembly 40; on the other hand, the frame 60 can also serve as a wall that blends more harmoniously and aesthetically with the application environment.

[0064] Based on the above embodiments, in one embodiment, the power supply 10 of the microbial electrocoupling remediation of heavy metals permeation reaction device is a DC power supply 10, and the power supply voltage of the DC power supply 10 is positively correlated with the distance between the anode 21 and the cathode 22.

[0065] In this embodiment, the controller 50 can automatically control the current switching based on the pollutant concentration and microbial growth status to save energy.

[0066] In this embodiment, for every 1 cm increase in the distance between the anode 21 and the cathode 22, the supply voltage of the DC power supply 10 can increase by 0.1 to 1.0 V. This configuration allows for voltage adjustment based on changes in pollutant concentration and microbial growth; furthermore, the DC power supply 10 can be powered by a battery, which is charged via the solar panel 70, resulting in greater energy savings; additionally, the overall voltage is lower, making it safer.

[0067] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A permeation reaction device for microbial electrocoupling remediation of heavy metals, characterized in that, include: power supply; At least one set of electrodes, adapted to be installed underground, the electrodes including an anode and a cathode arranged opposite each other, the anode being electrically connected to the positive terminal of the power source and adapted to be installed upstream of the groundwater, the cathode being electrically connected to the negative terminal of the power source and adapted to be installed downstream of the groundwater; the anode has a first flow channel and the cathode has a second flow channel. The liquid supply pipeline includes a first liquid supply pipeline communicating with the first flow channel and a second liquid supply pipeline communicating with the second flow channel; and A liquid medicine storage tank assembly is suitable for placement on the ground or buried underground. The liquid medicine storage tank assembly includes at least a first liquid medicine tank and a second liquid medicine tank. The first liquid medicine tank is connected to the inlet end of the first liquid supply pipeline and is used to contain organic matter for the growth of anaerobic bacteria and anaerobic microorganisms. The second liquid medicine tank is connected to the inlet end of the second liquid supply pipeline and is used to contain organic matter for the growth of aerobic autotrophic bacteria and aerobic autotrophic microorganisms. Both the anode and the cathode are porous carbon materials.

2. The permeation reaction device for microbial electrocoupling remediation of heavy metals as described in claim 1, characterized in that, The microbial electrocoupling remediation device for heavy metals also includes an aeration supply component, which is connected to the second liquid supply pipeline to supply aeration to the cathode.

3. The permeation reaction device for microbial electrocoupling remediation of heavy metals as described in claim 1, characterized in that, Both the anode and the cathode are equipped with lifting rings for hoisting.

4. The permeation reaction device for microbial electrocoupling remediation of heavy metals as described in claim 1, characterized in that, The power source is a DC power source, and the voltage of the DC power source is positively correlated with the distance between the anode and the cathode.

5. The permeation reaction device for microbial electrocoupling remediation of heavy metals as described in claim 4, characterized in that, For every 1 cm increase in the distance between the anode and the cathode, the supply voltage of the DC power supply increases by 0.1~1.0 V.

6. The permeation reaction device for microbial electrocoupling remediation of heavy metals as described in claim 1, characterized in that, The permeation reaction device for microbial electrocoupling remediation of heavy metals also includes: The controller is connected to the power supply and the drug storage tank assembly, respectively; and A detection component, connected to the controller, includes a heavy metal concentration monitor, a conductivity meter, and a water quality parameter meter; the detection component is used to detect the heavy metal concentration, conductivity, or various water quality parameters of groundwater and send detection signals to the controller. The controller is used to automatically determine and control the operation of the power supply and the medicine storage tank assembly based on the detection signal.

7. The permeation reaction device for microbial electrocoupling remediation of heavy metals as described in claim 6, characterized in that, The drug storage tank assembly further includes a third tank for containing the reducing solution, the third tank being connected to the supply pipeline and electrically connected to the controller; the controller is also used to control the third tank to inject the reducing solution into all the electrodes when the detected groundwater conductivity is less than a preset conductivity.

8. The permeation reaction device for microbial electrocoupling remediation of heavy metals as described in claim 7, characterized in that, The reducing solution is ferrous sulfate or calcium polysulfide.

9. The permeation reaction device for microbial electrocoupling remediation of heavy metals as described in claim 1, characterized in that, The permeation reaction device for microbial electrocoupling remediation of heavy metals also includes a solar panel and a battery. The solar panel is electrically connected to the battery and is suitable for exposure to sunlight. The battery is electrically connected to the power source.

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