River and lake water body-bottom mud in-situ electrokinetic remediation system

Abstract

The invention relates to the field of environmental protection engineering construction, and discloses a river and lake water body-bottom mud in-situ electrokinetic remediation system which comprises a plurality of electrode tubes, electrodes, a direct-current power supply and a wire, and the number of the electrode tubes and the number of the electrodes are equal and are both even; the electrode tube comprises an electrolyte chamber, a clay chamber, a repair chamber, a filter screen, a fixing buckle, a sealing cover, supporting legs and an overflow hole; the chamber of the electrode tube comprises one or more of an electrolyte chamber, a clay chamber and a repair chamber and at least comprises the repair chamber, and supporting legs are arranged below the electrode tube; the electrode is arranged in the electrolyte cavity, one end of the electrode is connected with a direct-current power supply through a wire, and supporting legs of an electrode tube are inserted into the lower lying layer; according to the invention, synchronous or asynchronous electrokinetic remediation of river and lake water and bottom mud pollutants is realized, the global dosage is reduced, and the excessive risk of chemical remediation is avoided.

Description

Technical Field

[0001] The patent of this invention belongs to the field of environmental protection engineering construction, and specifically relates to an in-situ electric repair system for river and lake water bodies and bottom mud. Background Art

[0002] With increasing attention to environmental issues, the influx of pollutants into lakes has been gradually brought under control. However, pollutants already accumulated in sediments, forming endogenous pollution through the interaction of mud and water, have become a key issue in the remediation and protection of lake environments. Sediment is a vital component of river and lake ecosystems. When sediment pollutant concentrations exceed baseline values ​​by 2-3 times, they pose a potential hazard to humans and aquatic ecosystems.

[0003] Among the common remediation technologies, there are physical remediation technologies: ecological dredging, improper operation can easily disturb the bottom sediment and cause secondary pollution, dredged sludge needs to be properly handled and the cost is high; aeration and reoxygenation, the effect of remediation of deep water or bottom sediment pollution is limited; chemical remediation technology: agents may change the pH or ecological balance of the water body, the long-term effect is unstable, and excessive addition has the risk of toxicity; biological remediation technology: microbial remediation, exogenous bacteria are easily inhibited by indigenous microorganisms, have poor environmental adaptability, and require optimized inoculation conditions; plant remediation, long growth cycle, may cause secondary pollution due to decay, and is only suitable for shallow water areas; biofilm technology is prone to clogging, and its efficiency decreases at low temperatures or high pollution loads. Summary of the Invention

[0004] The purpose of the present invention is to achieve in-situ repair of deep water bodies and bottom mud without disturbing the bottom mud.

[0005] As conceived above, the technical solution adopted by the present invention is:

[0006] An in-situ electric remediation system for river and lake water bodies and bottom mud, comprising an electrode tube, electrodes, a DC power supply and a conductor;

[0007] There are a plurality of electrode tubes and electrodes, both of which are equal and an even number;

[0008] The electrode tube includes an electrolyte chamber, a clay chamber, a repair chamber, a filter screen and a fixing buckle, a cover, a leg and an overflow hole, wherein the electrolyte chamber, the clay chamber, the repair chamber, the filter screen and the fixing buckle are arranged above the cover, and the cover is connected to the leg at the bottom of the electrode tube;

[0009] The electrode tube includes one or more of an electrolyte chamber, a clay chamber, and a repair chamber, and at least includes a repair chamber;

[0010] The overflow hole for discharging the purified water is placed on the upper part of the cathode of the electrode tube;

[0011] The electrode is placed in the electrolyte chamber, one end of the electrode is connected to a DC power supply via a wire, and the legs of the electrode tube are inserted into the underlying layer.

[0012] Preferably, the electrolyte chamber, clay chamber and repair chamber are selectively set according to the repair object.

[0013] Preferably, when the repair object includes bottom mud and river and lake water bodies, the cathode of the electrode tube includes at least a repair chamber, and the length of the repair chamber is consistent with the total depth of the river and lake water bodies and the bottom mud.

[0014] Preferably, when the repair object includes only bottom mud, the cathode of the electrode tube includes at least an electrolyte chamber, a clay chamber and a repair chamber, and the length of the repair chamber is consistent with the depth of the bottom mud.

[0015] Preferably, when the repair object only includes a water body, the cathode of the electrode tube includes at least a repair chamber, and the length of the repair chamber is consistent with the depth of the river or lake water body.

[0016] Optionally, the nano-adsorption material is disposed in locations including the interior of the repair chamber, the upper portion of the repair chamber, and the anode portion of the electrode tube.

[0017] Preferably, when the repair object includes a water body, the thickness of the nano-adsorption material is greater than or equal to the length of the repair chamber.

[0018] Preferably, when the repair object only includes bottom mud, the thickness of the nano-adsorption material is greater than the length of the repair chamber.

[0019] Preferably, a filter screen and a fixing buckle are provided between the electrolyte chamber and the clay chamber, a filter screen and a fixing buckle are also provided between the clay chamber and the repair chamber, and a cover is provided between the support leg and the repair chamber.

[0020] Preferably, an electrolyte containing chemical reagents is added into the electrolyte chamber according to the need for repairing the water body and bottom mud.

[0021] Preferably, the electrolyte in the electrolyte chamber is added with appropriate chemical reagents according to the type of pollutants.

[0022] Preferably, when there is electrolyte in the electrolyte chamber, the electrode is suspended in the electrolyte chamber, and when there is no electrolyte in the electrolyte chamber, the electrode is directly inserted into the interior of the nano-adsorption material.

[0023] Preferably, the clay chamber has a permeability coefficient of 10 -6 cm / s~10 -9 cm / s of clay.

[0024] Preferably, the thickness and moisture content of the soft clay are determined according to the electrical resistance of the water body and bottom mud of the river or lake to be repaired, so as to avoid equipment overload and burning.

[0025] Preferably, the repair chamber is a cylindrical chamber surrounded by vertical bars at intervals, and gaps exist between the vertical bars.

[0026] Optionally, the material of the vertical bars comprises any one of polyolefin, polyvinyl chloride and polystyrene.

[0027] The polyolefin material comprises any one of polyethylene, polypropylene and polybutylene.

[0028] The polystyrene material comprises any one of general-purpose polystyrene, high-impact polystyrene and expandable polystyrene.

[0029] Optionally, the nano-adsorption material comprises any one of carbon-based nanomaterial, metal oxide nanomaterial and composite nanomaterial.

[0030] The carbon-based nanomaterial comprises any one of carbon nanotube, graphene and carbon aerogel.

[0031] The metal oxide nanomaterial comprises any one of titanium dioxide, perovskite oxide and zinc oxide.

[0032] The composite nanomaterial comprises any one of metal-metal oxide composite nanomaterial, carbon-based-nanoparticle composite nanomaterial and metal-carbon-based-oxide ternary composite nanomaterial.

[0033] Optionally, the leg is any one of a plurality of cylindrical rods, hollow cylinders and other regular shapes.

[0034] Preferably, the overflow hole is arranged at the upper portion of the cathode of the electrode tube and is in communication with the electrolyte chamber.

[0035] Preferably, a selective separation membrane is arranged in the overflow hole, which can allow water molecules to pass freely but prevent functional additives (such as complexing agents, surfactants, redox agents and buffers) in the electrolyte from flowing out.

[0036] Preferably, the in-situ electrodynamic remediation method for river and lake water body and sediment comprises adding corresponding substances into the electrolyte chamber, clay chamber and repair chamber of the electrode tube, then inserting the electrode tube into the sediment and river and lake water body, and starting a direct current power supply, so as to guide the directional movement of pollution ions under the action of electrokinetics and efficiently capture and adsorb the pollution ions at the nano-adsorption material.

[0037] The beneficial effects of the present application are as follows:

[0038] 1、The present application adopts multi-chamber combined electrode tube design to realize synchronous or asynchronous electrodynamic remediation of river and lake water body and sediment pollutants, and through partition control of electric field and reaction conditions, the directional migration and removal efficiency of pollutants in different media (water phase / mud phase) are optimized.

[0039] 2、According to the types of pollutants in river and lake water body and sediment, the present application selects reasonable chemical reagents to be loaded into the electrolyte chamber of the electrode tube, avoids electrolyte leakage by using the clay loaded in the clay chamber, and reduces the global dosage by using the electric field to guide the directional migration of remediation reagents in the electrolyte to the specified electrode area, thereby avoiding the risk of excessive chemical remediation.

[0040] 3、According to the types of pollutants, the present application reasonably selects nano adsorption materials and loads them into the remediation chamber of the electrode tube, accelerates the migration rate of pollutants by using the electric field, greatly shortens the remediation period, and realizes efficient removal of river and lake water body and sediment pollutants. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a structural schematic diagram of the present application for remediation of river and lake sediment;

[0042] Figure 2 is a structural schematic diagram of the present application for remediation of river and lake water body;

[0043] Figure 3 is a structural schematic diagram of the present application for remediation of river and lake water body and sediment;

[0044] In the figure: electrode tube 100, electrode 200, direct current power supply 300, wire 400, electrolyte chamber 110, clay chamber 120, soft clay 121, remediation chamber 130, vertical bar 131, filter screen and fixing buckle 140, cover 150, leg 160, nano adsorption material 170, overflow hole 180, underlying layer 500, sediment 600 and river and lake water body 700. DETAILED DESCRIPTION

[0045] In order to make the technical means, creative features, purposes and effects realized by the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0046] As shown in Figures 1 to 3 , the present application includes electrode tube 100, electrode 200, direct current power supply 300 and wire 400;

[0047] The number of electrode tube 100 and electrode 200 is several, and the number of both is equal and even;

[0048] The electrode tube 100 includes an electrolyte chamber 110, a clay chamber 120, a repair chamber 130, a filter and fixing buckle 140, a cover 150, a leg 160, and an overflow hole 180. The electrolyte chamber 110, the clay chamber 120, the repair chamber 130, the filter and fixing buckle 140 are arranged above the cover 150, and the cover 150 is connected to the leg 160 at the bottom of the electrode tube.

[0049] The electrode tube 100 includes one or more of an electrolyte chamber 110 , a clay chamber 120 , and a repair chamber 130 , and at least includes the repair chamber 130 ;

[0050] The overflow hole 180 for discharging the purified water is placed on the upper part of the cathode of the electrode tube 100;

[0051] The electrode 200 is placed in the electrolyte chamber 110 , one end of the electrode 200 is connected to the DC power supply 300 via a wire 400 , and the leg 160 of the electrode tube 100 is inserted into the underlying layer 500 .

[0052] In this embodiment, the support leg 160 is inserted into the underlying layer 500 and fixed, the electrolyte chamber 110, clay chamber 120 and repair chamber 130 of the anode electrode tube 100 are connected in sequence, and the electrolyte chamber 110, clay chamber 120 and repair chamber 130 of the cathode electrode tube 100 are connected in sequence. When facing different repair objects, the number of chambers in the electrode tube 100 can be changed, but at least the repair chamber 130 is included.

[0053] In this embodiment, the filter and the fixing buckle 140 separate the electrolyte chamber 110, the clay chamber 120 and the repair chamber 130. The repair chamber 130 and the support leg 160 are separated by the cover 150. The filter and the fixing buckle 140 prevent particles of soft clay 121 from entering the repair chamber; the nano-adsorbent material 170 can be set inside or on the top of the repair chamber 130 as needed; the electrode 200 is placed in the electrolyte chamber 110 and connected to the DC power supply 300 via the wire 400 to form a closed repair system.

[0054] In this embodiment, chemical reagents are reasonably selected as the electrolyte 161 according to the types of pollutants in the river and lake water bodies or bottom mud and loaded into the electrolyte chamber 141. The electrolyte is in direct contact with the soft clay 121 and diffuses into the repair chamber 130 under the action of electrodynamics. The leakage of chemicals in the electrolyte into the river and lake water bodies under the action of hydraulic osmosis can be almost ignored.

[0055] In this embodiment, the clay chamber 120 adds soft clay 121, according to the resistance of the river and lake water body and the bottom mud to be repaired, the thickness and water content of the soft clay 121 are determined, the electrode 200 is connected with the direct current power supply 300 through the wire 400, low voltage direct current is applied first, whether the voltage is increased is judged according to the current feedback, and the overload burning of the related electrical equipment is avoided.

[0056] In this embodiment, when the direct current power supply 300 starts, an electric field is generated between the anode and the cathode of the electrode 200, under the action of the direct current electric field, the pollutant ions in the river and lake water body 700 or the bottom mud 600 are directly driven to migrate directionally, on the other hand, the ions in the electrolyte are driven to pass through the soft clay 121 into the repair chamber 130, and in the process of directional migration to the heterogeneous electrode, the pollutant forms a charged complex with the pollutant in the water body or the bottom mud to migrate directionally, so that the pollutant migrates to the heterogeneous electrode repair chamber 130 and is adsorbed by the nano adsorption material 170.

[0057] In this embodiment, the cover 150 prevents the material in the repair chamber 130 from leaking into the underlying layer 500 during operation, and the supporting leg 160 ensures that the electrode tube 100 is stable and does not shake, when the electrolyte is insufficient, the electrolyte can be supplemented to make the electrode 200 continuously suspended in the electrolyte chamber 110, if no electrolyte is needed, the electrode is directly inserted into the nano adsorption material 170, and each part cooperates to maintain the repair efficiency until the pollutant meets the standard.

[0058] In this embodiment, when the repair object includes the river and lake water body 700 and the bottom mud 600, the height of the repair chamber 130 in the electrode tube 100 is the same as the total height of the river and lake water body 700, and the electrode connected with the negative electrode of the direct current power supply can be directly inserted into the nano adsorption material 170 in the repair chamber 130 in the electrode tube, and no obvious electroosmosis will be generated in the water body; according to the type of the pollutant, when the closed cavity in the electrode tube 100 causes the electroosmosis to continuously rise, the generated electroosmosis will be directly discharged from the overflow port 180.

[0059] In this embodiment, when the repair object is the bottom mud 600, the height of the repair chamber 130 in the electrode tube 100 is the same as the thickness of the bottom mud 600; when the repair object is the river and lake water body 700, the height of the repair chamber 130 in the electrode tube is the same as the height of the river and lake water body 700.

[0060] In this embodiment, during the repair process, the change of the concentration of the pollutant in the water body and the bottom mud can be monitored in real time, and then the concentration of the chemical reagent in the electrolyte chamber 110, the update of the nano adsorption material, the size of the applied electric potential gradient and the like are adjusted, and the electrode tube is recovered after the repair is completed.

[0061] Specific implementation and principles:

[0062] During construction, the electrode tube 100 is divided into the electrolyte chamber 110, the clay chamber 120 and the repair chamber 130 by the filter screen, the fixing buckle 140 and the cover 150, and the electrode tube 100 is provided with the supporting leg below; an equal number of even electrode tubes 100 are inserted into the lower layer 500 through the supporting leg 160 to be fixed, so that the repair chamber 130 is in the river and lake water body and the bottom mud to be repaired.

[0063] After starting the power supply, the chemical reagent components in the electrolyte migrate along the soft clay 121 under the action of the electric field and are accompanied by electroosmotic flow, the pollutants and the complex formed by the pollutants and the chemical reagent in the electrolyte migrate in the designated direction under the action of the electric field, are adsorbed by the nano adsorption material 170, and finally the excess liquid is discharged from the overflow hole 180, the overflow hole 180 is provided with a selective separation membrane, which can allow water molecules to pass freely but prevent the functional additives (such as complexing agents, surfactants, oxidation-reduction agents, buffers) in the electrolyte from flowing out.

[0064] Before operation, the arrangement of the chambers of the electrode tube 100 is determined according to the depth and thickness of the river and lake water body and the bottom mud, the types of pollutants, and then the appropriate chemical reagent is selected; during the repair process, the change of the concentration of the pollutants can be monitored by real-time sampling in the water body and the bottom mud, and then the concentration of the chemical reagent in the electrolyte chamber 110, the update of the nano adsorption material, the size of the applied electric potential gradient and the like are adjusted, the electrolyte is supplemented or the electrode position is adjusted as needed, so that the repair effect meets the standard.

[0065] As can be known from the technical common sense, the present application can be realized by other embodiments without departing from the spirit or essential characteristics thereof. Therefore, the above-mentioned disclosed embodiments are only illustrative in all aspects, and are not the only ones. All changes within the scope of the present application or within the scope equivalent to the present application are included in the present application.

Claims

1. An in-situ electric remediation system for river and lake water bodies and bottom mud, characterized in that: It comprises an electrode tube (100), an electrode (200), a DC power supply (300) and a wire (400); The number of the electrode tubes (100) and electrodes (200) is equal and even. The electrode tube (100) comprises an electrolyte chamber (110), a clay chamber (120), a repair chamber (130), a filter screen and a fixing buckle (140), a cover (150), a leg (160), and an overflow hole (180), wherein the electrolyte chamber (110), the clay chamber (120), the repair chamber (130), the filter screen and the fixing buckle (140) are arranged above the cover (150), and the cover (150) is connected to the leg (160) at the bottom of the electrode tube; The electrode tube (100) includes one or more of an electrolyte chamber (110), a clay chamber (120), and a repair chamber (130), and at least includes the repair chamber (130); The overflow hole (180) for discharging the purified water is placed on the upper portion of the cathode of the electrode tube (100), and a selective separation membrane is provided in the overflow hole; The electrode (200) is placed in the electrolyte chamber (110), one end of the electrode (200) is connected to a DC power supply (300) via a wire (400), and the legs (160) of the electrode tube (100) are inserted into the underlying layer (500).

2. The in-situ electric remediation system for river and lake water bodies and bottom mud according to claim 1 is characterized in that: The electrolyte chamber (110), the clay chamber (120) and the repair chamber (130) are selectively arranged according to the repair object, and the cathode chamber of the electrode tube (100) is arranged in the following three situations: (1) Restoration objects include bottom sediment (600) and river and lake water bodies (700) The cathode of the electrode tube (100) at least includes a repair chamber (130), and the length of the repair chamber (130) is consistent with the total depth of the river or lake water body (700) and the bottom mud (600); The nano-adsorption material (170) is arranged inside the repair chamber (130), and the thickness thereof is greater than or equal to the length of the repair chamber (130); (2) The restoration object only includes the bottom mud (600) The cathode of the electrode tube (100) includes an electrolyte chamber (110), a clay chamber (120) and a repair chamber (130), and the length of the repair chamber (130) is consistent with the depth of the bottom mud (600); The nano-adsorption material (170) is arranged inside or above the repair chamber (130), and the thickness of the nano-adsorption material (170) is greater than the length of the repair chamber (130); (3) The restoration targets are only rivers and lakes (700) The cathode of the electrode tube (100) at least includes a repair chamber (130), and the length of the repair chamber (130) is consistent with the depth of the river or lake water body (700); The nano-adsorption material (170) is arranged inside the repair chamber (130), and its thickness is greater than or equal to the length of the repair chamber (130).

3. The in-situ electric remediation system for river and lake water bodies and bottom mud according to claim 1 is characterized in that: When there is electrolyte in the electrolyte chamber (110), the electrode (200) is suspended in the electrolyte chamber (110); when there is no electrolyte in the electrolyte chamber (110), the electrode is directly inserted into the interior of the nano-adsorption material (170).

4. The in-situ electric remediation system for river and lake water bodies and bottom mud according to claim 1 is characterized in that: A filter screen and a fixing buckle (140) are provided between the electrolyte chamber (110) and the clay chamber (120), a filter screen and a fixing buckle (140) are also provided between the clay chamber (120) and the repair chamber (130), and a cover (150) is provided between the support leg (160) and the repair chamber (130).

5. The in-situ electric remediation system for river and lake water bodies and bottom mud according to claim 1 is characterized in that: The repair chamber (130) is formed into a cylindrical chamber by vertical bars (131) arranged at a certain interval, and there are gaps between the vertical bars (131).

6. The in-situ electric remediation system for river and lake water bodies and bottom mud according to claim 1 is characterized in that: When the nano-adsorption material (170) is placed in the repair chamber (130), the nano-adsorption material (170) is first placed in a filter bag with the same inner diameter as the electrode tube, and the filter bag is inserted into the repair chamber (130). The nano-adsorption material (170) can be selectively placed in the anode tube or the cathode tube according to the positive and negative ion charges and the movement direction after complexation.

7. The in-situ electric remediation system for river and lake water bodies and bottom mud according to claim 3 is characterized in that: The material of the vertical strips (131) includes any one of polyolefins, polyvinyl chloride and polystyrene.

8. The in-situ electric remediation system for river and lake water bodies and bottom mud according to claim 1 is characterized in that: The nano-adsorption material (170) includes any one or more of carbon-based nano-materials, metal oxide nano-materials and composite nano-materials.

9. The in-situ electric remediation system for river and lake water bodies and bottom mud according to claim 1 is characterized in that: The overflow hole (180) is provided at the upper portion of the cathode of the electrode tube (100) and is communicated with the electrolyte chamber (110).

10. A method for in-situ electrokinetic remediation of river and lake water bodies and bottom mud, characterized in that: The method comprises adding corresponding substances into the electrolyte chamber (110), the clay chamber (120) and the repair chamber (130) of the electrode tube (100), inserting the electrode tube (100) into the bottom mud (600) and the river and lake water body (700), and starting a direct current power supply (300). Under the action of electrodynamics, the pollutant ions or their complexes are guided to move in a directional manner and are efficiently captured and adsorbed and fixed at the nano-adsorption material of the electrode tube (100).

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