CN107324450B - Packer type underground water circulating electrolysis treatment system - Google Patents

Packer type underground water circulating electrolysis treatment system Download PDF

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CN107324450B
CN107324450B CN201610279514.4A CN201610279514A CN107324450B CN 107324450 B CN107324450 B CN 107324450B CN 201610279514 A CN201610279514 A CN 201610279514A CN 107324450 B CN107324450 B CN 107324450B
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porous
porous electrode
groundwater
packer
water
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CN107324450A (en
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吴庭年
吴秉儒
吴亭仪
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SINOTECH ENVIRONMENTAL TECHNOLOGY Ltd
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KUN SHAN UNIVERSITY
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C02F2001/46133—Electrodes characterised by the material
    • C02F2001/46138—Electrodes comprising a substrate and a coating
    • C02F2001/46142—Catalytic coating
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06—Contaminated groundwater or leachate
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

The invention discloses a sealed underground water circulating electrolysis remediation system, which comprises: the device comprises a treatment well, a packing device, a water delivery device and at least one porous electrode. The remediation well is arranged on the ground surface and comprises a pipe wall and an accommodating space. The packing device is arranged in the accommodating space to divide the accommodating space into an upper layer, a middle layer and a lower layer. The water delivery device wears to locate the packing device, and the water delivery device contains: the pipeline and the water pump are communicated. The communication pipeline penetrates through the plurality of packers to communicate the upper layer with the lower layer. The water suction pump is arranged on the upper layer and communicated with the communicating pipeline so as to pump the underground water on the upper layer or the lower layer. At least one porous electrode is disposed on the upper layer and/or the lower layer, the at least one porous electrode includes a first group of first porous electrodes, and the first porous electrode includes: a first porous electrode element and a first porous tube. Therefore, the sealed underground water circulating electrolysis remediation system can directly or indirectly oxidize and degrade underground water pollutants.

Description

Packer type underground water circulating electrolysis treatment system
Technical Field
The invention relates to an underground water circulating electrolysis remediation system, in particular to a packing type underground water circulating electrolysis remediation system comprising a packing device and a porous electrode, and the effects of underground water pollution control and remediation are achieved in an economic manner.
Background
The conventional methods for treating groundwater include chemical or physical methods such as in-situ chemical oxidation, in-situ biological treatment, two-phase extraction, and in-situ electrolysis.
For example, the in-situ chemical oxidation method is to inject chemical agents (such as hydrogen peroxide (H)) into the groundwater2O2) Oxidizing agents such as Fenton Reagent (Fenton Reagent) or Persulfate Reagent (Persulfate) to perform oxidation reaction of groundwater pollutants. However, this method requires the addition of the chemical agents periodically and continuously, which results in a high cost of chemicals and labor. In addition, it is also one of the concerns whether the added chemical agent causes secondary pollution to the groundwater.
The in-situ biological treatment method mainly utilizes the mode of adding microorganisms or nutrient salt for helping the microorganisms to grow into underground water and utilizing the microorganism decomposition to degrade pollutants in the underground water. However, this method is not only time consuming, but also difficult to control the derivative contaminants of the microbial degradation in the groundwater. For example, the toxicity of groundwater is increased by vinyl chloride generated by the microbial degradation of trichloroethylene, which is counterproductive.
The two-phase pumping treatment method is to arrange a pumping well to pump out the pollutants in the underground water. However, this method requires a large number of pumping wells, consumes energy, and requires treatment of pumped waste water and gas, and is particularly suitable for secondary pollution control.
In addition, the three methods have to be specially designed for the treatment of Light non-aqueous phase liquid (LNAPL) contaminants and heavy non-aqueous phase liquid (DNAPL) contaminants, and cannot be treated by the same system at the same time, thus increasing the burden of field operators.
The in-situ electrolysis method has good degradation effect on the light water-insoluble phase liquid pollutants and the heavy water-insoluble phase liquid pollutants, so the in-situ electrolysis method is widely applied to underground water treatment. However, the currently known in situ electrolysis processes are limited in the extent to which the electrodes can carry out the electrolysis reaction, resulting in a smaller extent of degradable groundwater contaminants. In order to increase the electrolytic range of the electrode, the volume of the electrode must be increased, but the manufacturing and transportation of the electrode are difficult.
Therefore, there is a need for an underground water treatment system for in-situ electrolysis, which can overcome the limitations of the existing in-situ electrolysis, expand the scope of the influence of the electrolysis reaction, and further increase the underground water treatment effect of the in-situ electrolysis without using chemicals or other additives.
Disclosure of Invention
Therefore, an object of the present invention is to provide a packer-type groundwater circulation electrolysis remediation system, which uses a packer to separate the accommodating space of a remediation well, and uses a water pump to control the depth of groundwater so as to form a circulating groundwater flow. In addition, the device is matched with the specific arrangement position of the porous electrode according to the characteristics and the distribution depth of the underground water pollutants, so as to achieve the aim of treating the underground water by circulating electrolytic treatment.
In accordance with the above object, a packer-type groundwater circulation electrolysis remediation system is provided. In one embodiment, the packer-type groundwater circulation electrolysis remediation system comprises a remediation well, a packer device, a water delivery device, and at least one porous electrode.
The remediation well drill is arranged under the ground surface, wherein the remediation well can comprise a pipe wall and an accommodating space, and the pipe wall can be provided with a first well screen and a second well screen.
The packing device is arranged in the accommodating space to divide the accommodating space into an upper layer, a middle layer and a lower layer. The packer device may include a connection string and two packers disposed at both ends of the connection string.
The water delivery device can be arranged on the packing device in a penetrating mode and can comprise a communication pipeline and a water suction pump. The communication pipeline can penetrate through the two packers to communicate the upper layer and the lower layer. The water pump can be arranged on the upper layer and communicated with the communicating pipeline so as to pump the groundwater on the upper layer or the lower layer. The water pump comprises a water outlet end and a water inlet end.
The at least one porous electrode may be disposed on the upper layer and/or the lower layer. The at least one porous electrode may comprise a first group of first porous electrodes, and the first porous electrode comprises a first porous electrode element and a first porous tube. Wherein the first porous electrode element is electrically connectable to a power control device. The first porous tube may be disposed in the first porous electrode element, and the first porous tube may be in communication with the communication conduit.
In the packer-type groundwater circulation electrolysis remediation system, the first well screen may be located at an upper layer, the second well screen may be located at a lower layer, and the packer-type groundwater circulation electrolysis remediation system is used to treat groundwater pollutants.
According to an embodiment of the present invention, the first porous electrode may be disposed on the lower layer, the first group may be one or more, and the first porous tube and the water inlet end may be connected through a communication pipe.
According to an embodiment of the present invention, the first porous electrode may be disposed on the upper layer, the first group may be one or more, and the first porous tube and the water inlet end may be connected through a communication pipe.
According to an embodiment of the present invention, the at least one porous electrode may further include a second group of one or more second porous electrodes, the second porous electrodes may be disposed on the lower layer. The second porous electrode may comprise a second porous electrode element, and a second porous tube disposed in the second porous electrode element. The second porous electrode element can be electrically connected to the power control device, and the second porous tube can be communicated with the communicating pipeline.
According to an embodiment of the present invention, the first porous pipe and the water inlet end can be connected through a communication pipe.
According to an embodiment of the present invention, the second porous pipe and the water inlet end can be connected through a communication pipe.
According to an embodiment of the present invention, the connecting column may have a length of 1 to 3 meters.
According to an embodiment of the present invention, the first porous tube and the second porous tube may be made of an insulating material.
According to an embodiment of the invention, the first porous electrode and the second porous electrode may each be an electrocatalytic inert electrode.
According to an embodiment of the present invention, the material of the electrocatalytic inert electrode may comprise platinum, gold or platinum-ruthenium alloy.
By applying the packer type underground water circulating electrolysis remediation system, the containing space of the remediation well can be separated by using the packer, and the inlet and outlet depth of underground water is controlled by using the water pump so as to form a circulating underground water flowing direction. And then according to the characteristics and the distribution depth of the underground water pollutants, the porous electrode is arranged at a specific position, so that the underground water pollutants can be directly or indirectly oxidized and degraded in the underground water, and the effect of underground water treatment is improved.
Drawings
Embodiments of the invention will be better understood from the following detailed description taken in conjunction with the accompanying drawings. It is noted that, in accordance with standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion.
FIG. 1A is a schematic sectional view of a packer-type groundwater circulation electrolysis remediation system according to an embodiment of the present invention;
FIG. 1B is a schematic cross-sectional view of a first porous electrode according to one embodiment of the invention;
FIG. 2 is a schematic sectional view showing a packer-type groundwater circulation electrolysis remediation system according to another embodiment of the present invention; and
FIG. 3 is a schematic sectional view showing a packer-type groundwater circulation electrolysis remediation system according to yet another embodiment of the present invention.
Detailed Description
The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. Specific examples of components and arrangements are described below to simplify the present disclosure. These are, of course, merely examples and are not intended to be limiting. For example, the following description recites forming a first feature over or on a second feature, may include embodiments in which the first feature and the second feature are formed in direct contact, and may also include embodiments in which an additional feature is formed between the first feature and the second feature, such that the first feature and the second feature may not be in direct contact. Additionally, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.
Furthermore, spatially relative terms, such as "under," "below," "lower," "above," "higher," and the like, may be used herein for ease of description of the relationship of an element or feature to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the elements in use or steps in addition to the orientation depicted in the figures. Elements may be otherwise oriented (rotated 90 degrees or at other orientations) and the relative spatial descriptors used herein interpreted accordingly.
The embodiment of the invention provides a packer type underground water circulating electrolysis remediation system, which can adjust the inlet and outlet depth of underground water in a remediation well by utilizing a packer device and a water pump to form a circulating underground water flowing direction. In addition, porous electrodes may be placed at various depths in the remediation well depending on the nature and depth of distribution of the groundwater contaminants. Therefore, the sealed underground water circulating electrolysis remediation system can directly oxidize underground water pollutants in underground water by using strong oxidants or free radicals generated in the electrolysis process, or indirectly enable the strong oxidants to flow along with the underground water in a circulating manner and be distributed in a water-containing layer area near a remediation well by means of the specific arrangement mode, and decompose the underground water pollutants by using the strong oxidants, so that the influence range of the porous electrodes on oxidizing and degrading the underground water pollutants is enlarged, and the effect of underground water treatment remediation is further improved. Moreover, because no chemical agent or other additives are additionally added in the circulating electrolysis process, the method does not need to be supplemented or replaced frequently, thereby having the advantages of secondary pollution prevention, low treatment cost and low damage to treatment sites.
The term "depth of entry/exit" as used herein means that the groundwater in one layer of the remediation well is pumped to the other layer of the remediation well through a communication pipe and discharged by the action of a suction pump of the sealed groundwater circulation electrolysis remediation system, wherein the one layer and the other layer of the remediation well are located at different depths of the groundwater layers. In other words, the groundwater enters one layer of the remediation well first and then is discharged from the other layer of the remediation well, so that the groundwater has different depths of entry and exit to form a circulating groundwater flow direction.
The class of groundwater contaminants referred to herein include Light non-aqueous phase liquid (LNAPL) contaminants and heavy non-aqueous phase liquid (DNAPL) contaminants, wherein the Light non-aqueous phase liquid contaminants have a specific gravity less than water and are therefore typically located at the surface or upper strata of the groundwater aquifer. Heavy water insoluble phase liquid contaminants have a higher specific gravity than water and are therefore generally located in the lower layers of underground aquifers.
The light, water-insoluble phase liquid contaminants are typically organic hydrocarbons that are sparingly soluble in water. Specifically, the light water-insoluble phase liquid pollutant may include fuel such as gasoline, kerosene, or diesel. The heavy water insoluble phase liquid contaminant may comprise chlorinated organic solvent such as Trichloroethylene (TCE) or tetrachloroethylene (PCE).
The strong oxidant or free radical generated in the electrolysis process referred to herein is a hydroxyl radical (OH.) formed by electrolysis of water as shown in formula (I) when the porous electrode performs an electrolysis reaction in groundwater. The hydroxyl radicals are strong oxidants that degrade groundwater contaminants by oxidation.
H2O→OH.+H++e-Formula (I)
The groundwater treatment referred to herein in the present invention is to reduce the concentration of groundwater contaminants in groundwater by utilizing the aforementioned oxidative degradation reaction.
The packer type groundwater circulation electrolysis remediation system of the present invention will be described below using fig. 1A to 3. Referring first to fig. 1A, a schematic cross-sectional view of a packer-type groundwater circulation electrolysis remediation system 100 according to an embodiment of the invention is shown.
As shown in fig. 1A, the packer-type groundwater circulation electrolysis remediation system 100 includes a remediation well 110, a packer 120, a water delivery device 130, and a first group of first porous electrodes 140. In another embodiment, the insulated groundwater circulation electrolysis remediation system 100 may include a first plurality of groups, a plurality referred to herein as two or more.
The remediation well 110 is drilled at the surface 101, wherein the remediation well 110 may comprise a pipe wall 111 and an accommodation space 113, and the pipe wall 111 may be provided with a first well screen 115 and a second well screen 117. In an embodiment, the first well screen 115 and the second well screen 117 are located in the subterranean aquifer 107 below the groundwater level 103. In one example, the first well screen 115 may be disposed proximate the ground water line 103.
The sealing device 120 is disposed in the accommodating space 113 to divide the accommodating space 113 into an upper layer 113A, a middle layer 113B and a lower layer 113C. The packer 120 may comprise a connection string 123, and two packers 121 disposed on either end of the connection string 123. In one example, each packer 121 may include a plurality of apertures 125 to provide for the passage of various lines or wires as described below.
The water delivery device 130 may be disposed on the packing device 120, and the water delivery device 130 may include a communication pipe 131 and a suction pump 133. The communication line 131 may pass through the packer 121 to communicate the upper and lower stages 113A and 113C. In one example, the communication line 131 passes through the packer 121 via the hole 125. In another example, the communication pipe 131 may include two openings (e.g., the opening 131a and the opening 131b) provided at both ends.
In one embodiment, the opening 131a is disposed in the lower layer 113C, and the opening 131b is disposed in the upper layer 113A. The pump 133 may be disposed on the upper layer 113A to facilitate electrical connection with the power supply 150. The suction pump 133 includes a water inlet end 133a and a water outlet end 133 b. In one embodiment, the inlet end 133A may be connected to the opening 131a and the outlet end 133b may be connected to the opening 131b to draw groundwater from the lower layer 113C into the upper layer 113A.
In the embodiment shown in FIG. 1A, the first porous electrode 140 is disposed on the lower layer 113C. The first porous electrode 140 may comprise a first porous electrode element 141 and a first porous tube 143. Wherein the first porous electrode element 141 may be connected to the power control means 160 by a plurality of wires 180. In one example, the plurality of wires 180 are electrically connected to the first porous electrode element 141 and the power control device 160 through the holes 125, and the wires 180 may include a positive wire 181 and a negative wire 183, which are respectively connected to a positive electrode and a negative electrode (not shown) of the first porous electrode element 141, so that the first porous electrode 140 can perform an electrolytic reaction. The first porous tube 143 may be provided in the first porous electrode element 141, and the first porous tube 143 may communicate with the communication pipe 131.
The packer type groundwater circulation electrolysis remediation system 100 as shown in fig. 1A is used to treat groundwater contaminants, where a first well screen 115 may be located in an upper layer 113A and a second well screen 117 may be located in a lower layer 113C.
In one embodiment, the packer 121 of the packing device 120 is an inflatable packer. Further, the size of the uninflated packer 121 is smaller than the bore of the intervention well 110, so that the packer 120 can adjust its position in the intervention well 110 before it is inflated. One of the plurality of holes 125 in the packer 121 may be in communication with an inflation pump 170 using a line 171 to inflate the packer 121. The inflated packer 121 may be supported against the pipe wall 111 of the remedial well 110 to separate the accommodation space 113 into an upper layer 113A, a middle layer 113B, and a lower layer 113C. However, in another embodiment, the packer 120 may be secured in the remediation well 110.
In one embodiment, the connecting column 123 of the packer 120 may have a length of 1-3 meters to allow the upper and lower layers 113A and 113C to be spaced apart at a proper distance to allow the groundwater to have a circulating and stable flow direction. If the length is less than 1 m, the groundwater cannot have a circulating and stable flow direction, and the content of the strong oxidant distributed in the groundwater aquifer is reduced, thereby reducing the effect of groundwater treatment. If the length is more than 3 m, the force for controlling the flow direction of the groundwater dissipates and cannot be circulated in the predetermined flow direction.
In one embodiment, the power supply 150 is electrically connected to the power control device 160 to provide the electric energy required for the electrolysis reaction. The specific manner of carrying out the electrolytic reaction will be described later. In one example, the power supply 150 may be, for example, a solar power generator, a wind power generator, or an existing power supply line.
Next, referring to fig. 1B, a cross-sectional view of the first porous electrode according to an embodiment of the invention is shown. As shown in fig. 1B, the first porous electrode 140 includes a first porous electrode element 141 and a first porous tube 143, wherein the first porous electrode element 141 is a double-layer structure including a first portion 141a and a second portion 141B, and the first portion 141a and the second portion 141B are separated by an insulator 145 to avoid short-circuiting. The first portion 141a and the second portion 141B of the first porous electrode element 141 may be metal meshes (not shown) having pores, respectively, and the first porous electrode element 141 having a pillar shape as shown in fig. 1B may be formed by winding the metal meshes. The metal net can be made of platinum, gold or platinum-ruthenium alloy. Thus, the first porous electrode 140 is referred to herein as an electrocatalytic inert electrode, although usable electrodes are not limited thereto.
In one example, the first portion 141a is electrically connected to the positive electrode lead 181, and the second portion 141b is electrically connected to the negative electrode lead 183, such that the first portion 141a can serve as a positive electrode of the first porous electrode 140, and the second portion 141b can serve as a negative electrode of the first porous electrode 140. However, it should be understood by those skilled in the art that the first portion 141a can also serve as a negative electrode of the first porous electrode 140, and the second portion 141b serves as a positive electrode of the first porous electrode 140.
In one example, in order to prevent the plurality of leads 180 (the positive electrode lead 181 and the negative electrode lead 183) from losing functionality due to oxidation-reduction reaction during the electrolytic reaction, platinum, gold, or stainless steel may be used as the material of the leads 180. In another example, the material of the conductive wire 180 immersed in the groundwater may be platinum, gold, or stainless steel, and the material of the conductive wire 180 not immersed in the other part of the groundwater may be inexpensive and has good conductivity (e.g., copper).
In addition, as shown in fig. 1B, the first porous tube 143 is disposed in the first porous electrode element 141, and the first porous tube 143 further includes a connection 143a connected to the communication pipe 131 shown in fig. 1A. In one example, the material of the first porous tube 143 may be an insulating material, such as: glass fiber, polyethylene resin, polyacrylic resin, epoxy resin, etc., but the present invention is not limited thereto. The pores of the first porous pipe 143 are not limited to a diameter or size, and may be uniform or different in size, so that the electrolyzed groundwater may flow into the communication pipe 131 shown in FIG. 1A through the first porous pipe 143.
In one example, the top and bottom of the first porous electrode 140 may include an insulating portion 147 to prevent the first porous electrode element 141 from contacting the first porous electrode 140 during operation. The insulating member 145 and the insulating portion 147 may be made of teflon.
Next, referring to fig. 1A and fig. 1B together, the operation of the packer-type groundwater circulation electrolysis remediation system 100 according to the present invention will be described in detail. In one embodiment, where the groundwater contaminant being treated is a heavy, non-aqueous phase liquid contaminant as described above (e.g., groundwater contaminant 105 of FIG. 1A distributed in the lower layers of a groundwater aquifer), the first porous electrode 140 may be disposed in the lower layer 113C of the remediation well 110 using the compartmentalized groundwater circulation electrolysis remediation system 100 as shown in FIG. 1A. The groundwater may flow into the lower layer 113C of the remediation well 110 via the second well screen 117 under the action of the suction pump 133. Then, when the first porous electrode 140 is energized, an electrolytic reaction may be performed to generate a strong oxidant or hydroxyl radicals.
A portion of the strong oxidant or hydroxyl radicals may directly generate oxidation reactions with groundwater contaminants 105 and degrade groundwater contaminants 105. Another portion of the strong oxidant or hydroxyl radicals may be pumped with the groundwater, along with the action of the water pump 133, through the first porous tube 143 of the first porous electrode 140, to the upper layer 113A, and discharged into the groundwater layer through the first well screen 115. The discharged strong oxidant or hydroxyl radicals may be stably and circularly distributed in the groundwater layer 107 along the groundwater flow direction 109 to continuously perform the oxidative degradation reaction of the groundwater contaminant 105 in the groundwater layer. Accordingly, the electrolytic reaction influence range in which the first porous electrode 140 can act is increased, thereby achieving the purpose of improving the groundwater treatment efficiency.
As shown in fig. 1A, the arrangement of the water inlet end 133A and the water outlet end 133b of the water pump 133 (i.e., the water pump 133 pumps the groundwater of the upper layer 113A or the groundwater of the lower layer 113C) affects the circulation direction of the generated groundwater flow. Other embodiments of the present invention, the direction of circulating groundwater flow generated thereby, and the effects generated thereby will be specifically described below.
Referring next to fig. 2, a schematic cross-sectional view of a packer-type groundwater circulation electrolysis remediation system according to another embodiment of the invention is shown. As shown in fig. 2, the packer-type groundwater circulation electrolysis remediation system 200 may include a remediation well 210, a packer 220, a water delivery device 230, and a first group of first porous electrodes 240, which are arranged in a manner similar to the remediation well 110, the packer 120, the water delivery device 130, and the porous electrodes 140 of the packer-type groundwater circulation electrolysis remediation system 100, and therefore will not be described herein again. In another embodiment, the insulated groundwater circulation electrolysis remediation system 200 may include a first plurality of groups, a plurality referred to herein as two or more.
In contrast, the first porous electrode 240 of the packer-type groundwater circulation electrolysis remediation system 200 is disposed in the upper layer 213A of the remediation well 200 to effectively treat the groundwater contaminant 205, wherein the groundwater contaminant 205 is a light non-aqueous phase liquid contaminant.
As shown in fig. 2, the first porous tube 243 of the first porous electrode 240 is connected to the water inlet 233a of the water pump 233 through the opening 231a of the communication pipe 231. And opening 231b of communication pipe 231 is provided in lower layer 213C of well remediation well 210. In one embodiment, the action of the suction pump 233 of the water delivery device 230 allows groundwater and groundwater contaminants 205 to enter the upper strata 213A of the remediation well 210 via the first well screen 215. Then, the electrolysis reaction is started by the first porous electrode element 241 with the positive electrode lead 281 and the negative electrode lead 283 electrically connected to the power control device 260, and the generated strong oxidant or hydroxyl radical can directly perform the oxidation degradation reaction with the groundwater pollutants 205, or flow into the lower layer 213C of the remediation well 210 through the first porous pipe 243 and the communication pipe 231 in the first porous electrode 240, and then is discharged through the second well screen 217. The discharged strong oxidant or hydroxyl radical can be stably and circularly distributed in the groundwater layer along the groundwater flowing direction 209 to continuously perform oxidative degradation reaction with groundwater pollutants 205 in the groundwater layer, so as to improve the groundwater treatment effect.
It should be noted that, in this embodiment, since the first porous electrode 240 is located on the upper layer 213A, the positive lead 281 and the negative lead 283 of the first porous electrode 240 are not required to be electrically connected to the power control device 260 through the hole 225, but are directly electrically connected to the power control device 260.
According to the embodiment of fig. 1A and 2, it should be understood by those skilled in the art that the main technical means of the present invention is to separate the accommodating space of the groundwater well by using a packer (e.g., packer 120 or packer 220), locate a porous electrode (e.g., first porous electrode 140 or first porous electrode 240) in a layer with more distributed groundwater pollutants (e.g., groundwater pollutants 105 or groundwater pollutants 205), and perform an electrolytic reaction in the layer to increase the efficiency of groundwater treatment.
In other words, in order to increase the groundwater treatment efficiency of the sealed groundwater circulation electrolysis remediation system of the present invention, it is preferable to perform the steps of groundwater extraction and electrolysis on the layer where groundwater pollutants are distributed, and discharge the electrolyzed groundwater and the strong oxidant or the radical on the opposite layer, so that the strong oxidant or the radical can be stably and circularly distributed in the groundwater aquifer along the flowing direction of the groundwater, thereby expanding the operable range of the electrolysis reaction of the porous electrode and further increasing the groundwater treatment efficiency.
Referring next to fig. 3, a schematic cross-sectional view of a packer-type groundwater circulation electrolysis remediation system according to another embodiment of the invention is shown. As shown in fig. 3, the packer-type groundwater circulation electrolysis remediation system 300 may include a remediation well 310, a packer 320, a water delivery device 330, and two porous electrodes (a first porous electrode 340A of a first group and a second porous electrode 340B of a second group, respectively). The treating well 310, the packing device 320 and the water delivery device 330 of the above-described packing type groundwater circulation electrolysis treating system 300 have similar arrangements to those of the treating well 110, the packing device 120 and the water delivery device 130 of the packing type groundwater circulation electrolysis treating system 100. First porous electrode 340A and second porous electrode 340B have the same construction and arrangement as first porous electrode 140 described previously. In another embodiment, the packer-type groundwater circulation electrolysis remediation system 300 may include a plurality of first groups, and/or a plurality of second groups, where the plurality is referred to herein as two or more, and the number of the first groups and the second groups may be the same or different.
As shown in fig. 3, the first and second porous electrodes 340A and 340B of the packer-type groundwater circulation electrolysis remediation system 300 are provided in the upper and lower layers 313A and 313C of the remediation well 310, respectively. The first porous electrode 340A is electrically connected to the power control device 360 via a positive electrode lead 381a and a negative electrode lead 383 a. The second porous electrode 340B is electrically connected to the power control device 360 through a positive wire 381B and a negative wire 383B, and the positive wire 381B and the negative wire 383B are disposed through the hole 325.
In one example, when the groundwater contaminant is a heavy water-insoluble phase liquid contaminant, the second porous electrode 340B may be utilized to perform an electrolysis reaction and extract groundwater, so as to achieve the purpose of groundwater treatment, wherein the groundwater may be transported to the second porous electrode 340B through the second well screen 317 and discharged out of the remediation well 310 through the first well screen 315, and the specific arrangement is similar to the embodiment of fig. 1A, and therefore, the detailed description thereof is omitted.
Except that the electrolyzed underground water and the strong oxidizing agent or radical are transported to the first porous electrode 340A located in the upper layer 313A via the communication pipe 331. After that, the treatment effect of the pollutants can be enhanced through one electrolysis reaction. The groundwater after the second electrolysis and the strong oxidant or free radicals are then discharged through the first well screen 315.
In another example, when the groundwater contaminant is a light non-aqueous phase liquid contaminant, the first porous electrode 340A may be used to perform an electrolysis reaction and extract groundwater for groundwater treatment, wherein the groundwater may be transported to the first porous electrode 340A through the first well screen 315 and discharged out of the remediation well 310 through the second well screen 317.
Except that the electrolyzed underground water and the strong oxidizing agent or radical are transported to the second porous electrode 340B located in the lower layer 313C via the communication pipe 331. After that, the treatment effect of the pollutants can be enhanced through one electrolysis reaction. The groundwater after the second electrolysis and the strong oxidants or free radicals are then discharged via the second well screen 317.
The sealed groundwater circulation electrolysis remediation system 300 as shown in fig. 3 can enhance the efficiency of the oxidative degradation reaction by means of secondary electrolysis to achieve better groundwater treatment effect.
It is supplementary to say that the packer-type groundwater circulation electrolysis remediation system of the present invention may include one or more first groups, and/or one or more second groups. Although the embodiments of the first group of the first porous electrodes 140 of fig. 1, the first group of the first porous electrodes 240 of fig. 2, and the first group of the first porous electrodes 340A and the second group of the second porous electrodes 340B of fig. 3 are respectively illustrated as a first group, or a first group and a second group, in order to improve the portability of the packer-type groundwater circulation electrolysis remediation system, the embodiments of the present invention are not intended to limit the scope of the present invention. Therefore, the number of porous electrodes disposed on the upper and/or lower layers of the remedial well can be determined according to actual needs and considerations.
By applying the packer type underground water circulating electrolysis remediation system, the containing space of the remediation well can be separated by using the packer, and the inlet and outlet depth of underground water is controlled by using the water pump so as to form a circulating underground water flowing direction. In addition, the porous electrode is disposed at a specific position according to the kind of the groundwater contaminant. Therefore, the groundwater pollutants can be directly oxidized in the groundwater, or the strong oxidant generated in the electrolysis process can be distributed in the area near the remediation well along with the stable and circular flow direction of the groundwater by the specific arrangement mode, so that the range of the electrolysis reaction of the porous electrode can be enlarged, and the groundwater treatment effect can be effectively improved.
Moreover, the sealed underground water circulating electrolysis treatment system can be applied to treating different underground water pollutants such as light water-insoluble phase liquid pollutants, heavy water-insoluble phase liquid pollutants and the like, and the actual treatment method only needs to adjust the directions of the water inlet end and the water outlet end of the water suction pump without modifying the sealed underground water circulating electrolysis treatment system with large cost.
In addition, the invention adopts electric energy to carry out oxidation degradation reaction to decompose underground water pollutants, so that chemical agents or other additives do not need to be added periodically, secondary pollution can be avoided, the treatment cost is reduced, and the destructiveness on treatment sites is low.
The foregoing outlines features of various embodiments so that those skilled in the art may further understand the embodiments of the present disclosure. Those skilled in the art should appreciate that they may readily use the present disclosure as a basis for designing or modifying other processes and structures for carrying out the same purposes and/or achieving the same advantages of the embodiments introduced herein. It should also be understood by those skilled in the art that the same structures as described above may be made, substituted or replaced without departing from the spirit and scope of the present invention.

Claims (9)

1. A packer-type groundwater circulation electrolysis remediation system, comprising:
the remediation well is drilled on the ground surface, wherein the remediation well comprises a pipe wall and an accommodating space, and a first well screen and a second well screen are arranged on the pipe wall;
a packing device disposed in the accommodating space to divide the accommodating space into an upper layer, a middle layer and a lower layer, wherein the packing device comprises:
two packers; and
a connecting column disposed between the two packers, wherein both ends of the connecting column are connected to the two packers, respectively, whereby the packer separates the upper layer from the lower layer by an appropriate distance, and wherein the connecting column has a length of 1-3 meters;
a water delivery device disposed through the packing device, wherein the water delivery device comprises:
the communication pipeline penetrates through the two packers to communicate the upper layer with the lower layer; and
the water suction pump is arranged on the upper layer and is communicated with the communication pipeline so as to pump the underground water on the upper layer or the lower layer, and the water suction pump comprises a water outlet end and a water inlet end; and
at least one porous electrode disposed on the upper layer and/or the lower layer, wherein the at least one porous electrode comprises a first group of first porous electrodes, and the first porous electrode comprises:
a first porous electrode element electrically connected to the power control device; and
a first porous tube provided in the first porous electrode element, wherein the first porous tube is in communication with the communication line;
wherein the first well screen is positioned on the upper layer, the second well screen is positioned on the lower layer, and the packer type groundwater circulating electrolysis remediation system is used for treating groundwater pollutants.
2. The packer-type groundwater circulation electrolysis remediation system of claim 1, wherein the first porous electrode is disposed on the lower layer, the first group is one or more, and the first porous pipe and the water inlet end are connected via the communication pipe.
3. The packer-type groundwater circulation electrolysis remediation system of claim 1, wherein the first porous electrode is provided on the upper layer, the first group is one or more, and the first porous pipe and the water inlet end are connected via the communication pipe.
4. The packer-type groundwater circulation electrolysis remediation system of claim 3, wherein the at least one porous electrode further comprises a second group of one or more second porous electrodes disposed on the lower layer, the second porous electrode comprising:
a second porous electrode element electrically connected to the power control device; and
a second porous tube disposed in the second porous electrode element, wherein the second porous tube is in communication with the communication conduit.
5. The packer type groundwater circulation electrolysis remediation system of claim 4, wherein the first porous pipe is connected to the water inlet end via the communication pipe.
6. The packer type groundwater circulation electrolysis remediation system of claim 4, wherein the second porous pipe is connected to the water inlet end via the communication pipe.
7. The packer-type groundwater circulation electrolysis remediation system of claim 4, wherein the first porous pipe and the second porous pipe are made of an insulating material.
8. The compartmentalized groundwater circulating electrolysis remediation system of claim 4 wherein the first porous electrode and the second porous electrode are each electrocatalytic inert electrodes.
9. The sealed groundwater circulating electrolysis remediation system of claim 8 wherein the material of the electrocatalytic inert electrode comprises platinum, gold, or a platinum ruthenium alloy.
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