CN116161837A - Assembled PRB combined electrodynamic force cadmium pollution substrate sludge repairing system and method - Google Patents
Assembled PRB combined electrodynamic force cadmium pollution substrate sludge repairing system and method Download PDFInfo
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- CN116161837A CN116161837A CN202310424672.4A CN202310424672A CN116161837A CN 116161837 A CN116161837 A CN 116161837A CN 202310424672 A CN202310424672 A CN 202310424672A CN 116161837 A CN116161837 A CN 116161837A
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- UZVUJVFQFNHRSY-OUTKXMMCSA-J tetrasodium;(2s)-2-[bis(carboxylatomethyl)amino]pentanedioate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CC[C@@H](C([O-])=O)N(CC([O-])=O)CC([O-])=O UZVUJVFQFNHRSY-OUTKXMMCSA-J 0.000 claims description 11
- 238000000605 extraction Methods 0.000 claims description 10
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- 238000012856 packing Methods 0.000 claims description 8
- 238000005067 remediation Methods 0.000 claims description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- -1 polyethylene Polymers 0.000 claims description 6
- 238000000197 pyrolysis Methods 0.000 claims description 5
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 4
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical group [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims description 4
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- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 claims description 3
- 229910000342 sodium bisulfate Inorganic materials 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
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Images
Classifications
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/006—Electrochemical treatment, e.g. electro-oxidation or electro-osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/15—Treatment of sludge; Devices therefor by de-watering, drying or thickening by treatment with electric, magnetic or electromagnetic fields; by treatment with ultrasonic waves
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- 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
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a system and a method for repairing cadmium pollution substrate sludge by combining assembled PRB (physical resource block) and electrodynamic force, wherein the system comprises the following steps: the device comprises a program-controlled direct-current power supply, a plurality of repairing micro units, a control unit and a liquid adding unit; the repairing micro unit comprises an electrode assembly and a PRB reaction wall, the control unit is connected with the composite conveying pipeline, the leaching agent conveying pipeline and the quantitative liquid adding equipment, and the liquid adding unit comprises the composite conveying pipeline, the leaching agent conveying pipeline, the composite solution tank, the quantitative liquid adding equipment and the stabilizer storage tank. The invention is convenient for in-situ repair of heavy metal cadmium pollution of sludge in a large amount of pits and is beneficial to realizing dehydration and reduction of bottom sludge; the repairing effect of the bottom mud of the pit polluted by the heavy metal cadmium is enhanced, and the repairing cost is reduced; the invention adopts an assembled structure, and can be disassembled and assembled; the device is suitable for repairing operations of different terrains and polluted areas, and has the characteristics of flexible assembly and simplicity and convenience in installation.
Description
Technical Field
The invention relates to the technical field of sediment remediation, in particular to a system and a method for remedying assembled PRB combined electrodynamic force cadmium pollution sediment.
Background
At present, with the rapid development of industry and the continuous promotion of modern construction, the heavy metal pollution trend of pit bottom mud is continuously aggravated due to the extremely strong accumulation effect of the pit bottom mud on heavy metal, and the pit bottom mud pollution has the characteristics of long pollution time, complex pollution components, large storage quantity and the like, so the pit bottom mud has become an outstanding environmental problem.
Cadmium is one of the most toxic elements in known elements, and after entering a water body through the ways of soil flushing, atmospheric sedimentation, chemical combustion, various sewage discharge and the like, the cadmium is gradually deposited into bottom mud of a pit pool through the effects of adsorption, flocculation, precipitation and the like of water body particles, so that a large amount of cadmium in the bottom mud is gathered, and the water quality of the water body is greatly influenced. Meanwhile, through food chain migration and enrichment, great threats are caused to plant growth and development and human and animal health.
According to the prior data, the current PRB+electric repairing device for the bottom mud of the pit polluted by heavy metal cadmium is not more, and has the following defects: (1) The electrode array adopted by the existing in-situ electric repair system is mostly a circular array, the coverage area of the target pollution site is small, the coverage is incomplete, and the repair efficiency is low. (2) The system device has complex design, difficult operation, high cost and easy secondary pollution. (3) The existing repair system is lack of splicing property, poor in applicability, free of material replacement and recycling, and lack of large-scale application foundation because the field condition of the target polluted site is less considered.
Disclosure of Invention
In view of the technical problems, the invention provides a system and a method for repairing the assembled PRB combined electrodynamic cadmium pollution substrate sludge, which at least solve the part of the technical problems, and the system has the advantages of simple and reasonable structure, convenient operation, strong applicability, capability of effectively covering a target pollution site and high repair efficiency; the system is beneficial to the realization of a higher efficient repairing effect of the bottom mud of the cadmium polluted pit pool; the method is convenient for in-situ repair of cadmium pollution of the bottom mud, and simultaneously, the bottom mud is dehydrated, thereby being beneficial to realizing reduction and harmless treatment of the bottom mud.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
in a first aspect, the invention provides a fabricated PRB combined electrodynamic cadmium pollution substrate sludge remediation system, comprising: repair power, a plurality of repair micro unit, liquid feeding unit and control unit, wherein:
the repair power supply is connected with a plurality of repair micro units; the single repair microcell comprises: electrode assemblies and PRB reaction walls; the electrode assembly comprises an anode plate electrode and a cathode tubular electrode, wherein the anode plate electrode is arranged into a hexagonal electrode array by taking an electrode tube of the cathode tubular electrode as a center; the PRB reaction wall and the anode plate-shaped electrode are arranged in parallel and positioned in the middle of the anode and the cathode, and form a double-layer hexagonal array with the anode plate-shaped electrode;
the liquid adding unit comprises: the device comprises a composite solution tank, a stabilizer storage tank, quantitative liquid adding equipment, a leaching agent conveying pipeline and a composite conveying pipeline; the compound solution tank is used for storing a eluting agent or a cadmium-containing solution, the liquid outlet end of the compound solution tank is connected with the quantitative liquid adding equipment and the eluting agent conveying pipeline, and the liquid inlet end is connected with the compound conveying pipeline; the stabilizer storage tank is used for storing a stabilizer and is connected with the quantitative liquid adding equipment and the composite conveying pipeline; the tail ends of the leaching agent conveying pipeline and the compound conveying pipeline are provided with spraying devices;
the control unit is respectively connected with the quantitative liquid adding device, the eluent conveying pipeline and the composite conveying pipeline and is used for controlling conveying of the eluent and the stabilizing agent.
Preferably, the system further comprises: and the extraction pump is connected with the control unit and is used for extracting the cadmium-containing solution near the cathode tubular electrode into the composite solution tank through the composite conveying pipeline under the control of the control unit.
Preferably, the repair micro unit adopts an assembled structure, and the electrode assembly and the PRB reaction wall are disassembled and assembled by installing a preset clamping groove.
Preferably, the repairing micro units are arranged in a honeycomb mode in the pit bottom mud polluted by cadmium.
Preferably, the repair power supply is a programmable direct current power supply, the programmable direct current power supply is connected with the electrode assembly of the repair micro-unit, and the repair voltage gradient of the programmable direct current power supply is 0.5-2V/cm.
Preferably, the anode plate electrode and the cathode tubular electrode are both composite plastic conductive electrodes, wherein: the composite plastic comprises the following components: polyethylene composite conductive plastic or polypropylene composite conductive plastic; the outer layers of the anode plate-shaped electrode and the cathode tubular electrode are respectively wrapped with a filter screen, and the aperture of the filter screen is 100-1000 mu m; the anode plate electrode and the cathode tubular electrode liner are hollow structures; the wall surface of the lower part of the inner container of the cathode tube electrode is provided with a hole, and the aperture is 2-5 mm.
Preferably, the two side walls of the PRB reaction wall are made of stainless steel, and a plurality of water permeable holes are formed in the surfaces of the two side walls; the PRB reaction wall is internally provided with a packing groove, the packing groove is filled with active packing, and the active packing is as follows: one or more of nanometer zero-valent iron biochar, polymer-reed co-pyrolysis biochar and polyaniline.
Preferably, the eluent in the composite solution tank is: the feed additive is prepared by mixing and proportioning one or more of glutamic acid GLDA, oxalic acid di-sunflower ester DDA, citric acid CA and sodium chloride in equal proportion; the water-soil ratio of the eluent to the bottom mud soil is 5:1-10:1; the stabilizer in the stabilizer storage tank is sodium sulfide or sodium bisulfate with the concentration of 0.3 mol/L.
Second aspect: the invention also provides a method for repairing the cadmium pollution bottom sediment by combining the assembled PRB and the electrodynamic force, which is applied to the system for repairing the cadmium pollution bottom sediment by combining the assembled PRB and the electrodynamic force in the embodiment, and realizes the repair of the bottom sediment of the cadmium pollution pit, and the method comprises the following steps:
the first stage: the repairing micro unit of the system is inserted into the bottom mud of the pit polluted by cadmium, a program-controlled direct current power supply is connected, the automatic control of the control unit is utilized, the leaching agent in the composite solution tank uniformly sprays the bottom mud of the pit polluted by cadmium at the tail end of a leaching agent conveying pipeline through a spraying device, so that the solution is in full contact with the bottom mud, and the cadmium in the bottom mud is dissolved. Under the action of an electric effect, the cadmium-containing solution directionally migrates to a cathode; meanwhile, in the migration process, the cadmium-containing solution firstly passes through the PRB reaction wall and reacts with the filler in the PRB reaction wall under the action of an electric field, so that a part of cadmium pollutants is removed. Meanwhile, the PRB reaction walls are replaced.
And a second stage: the treated residual liquid continuously migrates to the cathode electrode tube, the solution containing heavy metal cadmium near the electrode tube of the cathode tubular electrode is pumped into a composite solution tank through a composite conveying pipeline under the action of an extraction pump by using the automatic control of a control unit, and the waste liquid (namely the extracted cadmium-containing residual liquid) in the composite solution tank is collected and discharged. Pore water and charged ions in the sediment at the stage can gather towards the cathode under the electromigration effect, and then heavy metal pollution restoration and sediment dehydration are realized through extraction and collection.
And a third stage: under the automatic control of the control unit, the stabilizer in the stabilizer storage tank uniformly sprays the PRB reaction wall and the cadmium pollution pit bottom mud in the cathode electrode tube through a spraying device at the tail end of the composite conveying pipeline, and under the action of an electric field, the stabilizer directionally migrates to the cathode electrode tube to stabilize and fix cadmium in the solution containing heavy metal cadmium remained near the cathode electrode tube.
Preferably, the system repairing stage is set by touch screen operation of the control unit, and the system self-control operation is realized, and the specific process is as follows:
in the first stage, the leaching time is 1h each time, the main switch is automatically closed after reaching the set time, and is static for 1-2h, so that the sediment reaches a water saturation state, then the main switch is automatically switched on, the repairing time is set to be 12-18h, the power is automatically switched off after reaching the set time, the first stage is terminated, the PRB reaction wall is replaced, and the second repairing stage is started;
in the second stage, setting the repair time to be 12-18h, automatically powering off after the repair time reaches the set time, terminating the second stage, collecting and discharging the waste liquid in the composite solution tank, and starting a third repair stage;
and in the third stage, setting the stabilization repair time to be 24-36h, and automatically powering off after the set time is reached to finish the repair process.
Compared with the prior art, the invention has at least the following beneficial technical effects:
1. the invention provides a system and a method for repairing the cadmium pollution substrate sludge by combining assembled PRB (physical resource block) with electrodynamic force, which have the advantages of simple and reasonable system structure, convenient operation, strong applicability, capability of effectively covering a target pollution site and high repair efficiency; the system is beneficial to enabling the cadmium polluted pit bottom mud to achieve a higher efficient repairing effect, and reduces the repairing cost: the method is convenient for in-situ repair of cadmium pollution of the bottom mud, and simultaneously, the bottom mud is dehydrated, thereby being beneficial to realizing reduction and harmless treatment of the bottom mud.
2, the system adopts an assembled structure, can be installed through a preset clamping groove, realizes the detachability and the assembly property of the electrode assembly and the PRB reaction wall, is beneficial to the replacement and the recycling of materials, and improves the working efficiency; meanwhile, the number of the assembled repair micro units and the shape of the repair field can be determined according to the shape and the area of the target polluted field, and a large-scale application basis is provided.
3. According to the invention, the repairing micro-unit and the liquid adding unit are organically combined, so that the PRB is combined with several repairing technologies such as electrodynamic force repairing, in-situ leaching and chemical fixing repairing are parallel, and the limitation of a single repairing technology is overcome.
4. The leaching agent can be fully contacted with the cadmium polluted bottom mud, so that the leaching repair effect is enhanced, and the cost is saved.
5. According to the invention, the liquid adding flow and the liquid adding flow rate can be set according to different environment or system requirements, so that the pit bottom mud polluted by cadmium can be repaired efficiently.
6. According to the invention, by replacing the PRB reaction wall, part of heavy metal cadmium is conveniently and thoroughly removed from the bottom mud of the polluted pit pond, and the risk of secondary pollution of the bottom mud is greatly reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief description will be given below of the drawings that are needed in the embodiments or the prior art descriptions, and it is obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention.
Fig. 1 is a schematic structural diagram of an assembled PRB combined electrodynamic cadmium pollution substrate sludge repair system provided by the invention.
Fig. 2 is an arrangement schematic diagram of an assembled PRB combined electrodynamic cadmium pollution substrate sludge repair system provided by the invention.
Fig. 3 is a schematic flow chart of a method for repairing assembled PRB combined electrodynamic cadmium pollution substrate sludge.
FIG. 4 is a graph showing comparative analysis of cadmium removal rate of bottom sludge of the pits in examples 2 to 5 of the present invention.
FIG. 5 is a graph showing comparative analysis of cadmium removal rate of bottom sludge of the ponds in examples 2 and 6 of the present invention.
FIG. 6 is a graph showing comparative analysis of cadmium removal rate of bottom sludge of ponds in examples 2, 7 and 8 of the present invention.
Wherein, 1-a program-controlled direct current power supply; a 2-electrode assembly; 3-PRB reaction walls; 4-a composite conveying pipeline; 5-a eluent delivery line; 6-a control unit; 7-a composite solution tank; 8-quantitative liquid adding equipment; 9-a stabilizer tank; 10-Y valve.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1:
referring to fig. 1, an embodiment of the present invention provides an assembled PRB combined electrodynamic force cadmium pollution substrate sludge repair system, which includes: repair power supply 1, a plurality of repair micro-unit, liquid feeding unit and control unit 6, wherein: the single repair microcell includes an electrode assembly 2, a PRB reaction wall 3 (permeable reaction wall). The method comprises the following steps: the electrode assembly 2 comprises anode plate electrodes and cathode tube electrodes, wherein the anode plate electrodes are arranged into a hexagonal electrode array by taking a cathode tube as a center; the PRB reaction wall 3 is arranged in parallel with the anode plate-shaped electrodes and positioned in the middle of the anode and the cathode, and forms a double-layer hexagonal array with the anode plate-shaped electrodes.
In the embodiment, the repair power supply 1 is a programmable direct current power supply, and the programmable direct current power supply 1 is connected with the electrode assembly 2 of the repair micro unit; the method comprises the following steps: the hexagonal outer ring anode plate electrode is connected to the positive electrode of the program-controlled direct current power supply 1, and the cathode tubular electrode at the center of the hexagon is connected to the negative electrode of the program-controlled direct current power supply 1; preferably, the repairing voltage gradient of the programmable direct current power supply 1 is 0.5-2V/cm.
Further, the system further comprises: an extraction pump (not shown) is connected to the control unit 6.
As shown in fig. 1, the liquid adding unit comprises a compound conveying pipeline 4, a leaching agent conveying pipeline 5, a compound solution tank 7, a quantitative liquid adding device 8 and a stabilizing agent storage tank 9. The control unit 6 is connected with the compound conveying pipeline 4, the leacheate conveying pipeline 5 and the quantitative liquid adding equipment 8.
As shown in fig. 2, the composite conveying pipeline 4 can be divided into a plurality of branch pipelines, the branch pipelines realize the effect of extracting and collecting cadmium-containing solution by an extraction pump at the tail end of each repair micro unit (second stage), and a spraying device (not shown in the figure) can be further arranged at the tail end of the branch pipeline for realizing the uniform spraying effect (third stage) of the stabilizer, and the component also plays a role in arranging the pipeline. The tail end of the eluent delivery pipeline 5 is also provided with a spraying device for uniformly spraying the eluent.
In this embodiment, the control unit 6 is a PLC industrial personal computer with a display and key module, and can set working time and flow; the dosing device 8 may be a peristaltic pump or a diaphragm metering pump.
Further, in the present embodiment, the composite solution tank 7 is used for storing the eluting agent or storing the recovered cadmium-containing solution after the eluting agent is sprayed, and in the implementation, the composite solution tank 7 may have a single-cavity or double-cavity structure, and in the case of a single-cavity structure, the eluting agent is used up and then used for storing the collected cadmium-containing solution. The liquid outlet end of the composite solution tank 7 is connected with quantitative liquid adding equipment 8 and a leaching agent conveying pipeline 5, and leaching agent is injected into the bottom mud of the cadmium polluted pond under the control of the control unit 6; the liquid inlet end of the composite solution tank 7 is used for pumping the cadmium-containing solution in the bottom mud of the pit pond near the cathode electrode tube into the composite solution tank 7 through the composite conveying pipeline 4 under the pumping of the extraction pump.
In the embodiment, the stabilizer storage tank 9 is used for storing the stabilizer, the stabilizer storage tank 9 is connected with the quantitative liquid adding device 8 and the compound conveying pipeline 4, and the stabilizer is injected into the pit bottom mud polluted by cadmium under the control of the control unit 6.
As the preferred implementation mode of the embodiment, the whole system adopts an assembled structure, and the detachable and spliced anode plate-shaped electrode, cathode tubular electrode and PRB reaction wall can be realized through the installation of a preset clamping groove; meanwhile, the number of the assembled micro units and the shape of the repair field can be determined according to the shape and the area of the target polluted field by adjusting the assembly mode of a plurality of the repair micro units.
As a preferred implementation of this embodiment, as shown in FIG. 2, the repairing micro-units described above can be adaptively arranged in the bottom sludge of the cadmium polluted pit, for example, in a honeycomb arrangement mode, and then connected with the liquid adding unit and the program-controlled DC power supply. Meanwhile, the liquid adding flow and the flow rate of the liquid adding unit can be set according to different scenes.
As a preferred implementation of this embodiment, the anode plate electrode and the cathode tubular electrode in the electrode assembly 2 are both composite plastic conductive electrodes, wherein:
the composite conductive plastic is one of polyethylene composite conductive plastic and polypropylene composite conductive plastic; the anode plate electrode and the cathode tube electrode liner are hollow, and a layer of conductive plastic is wrapped on the outer layer; the outer layers of the anode plate electrode and the cathode tube electrode are wrapped by filter screens, and the pore diameter of the filter screens is preferably 100-1000 mu m so as to prevent large-particle impurities in the bottom mud from polluting the electrode. Holes are arranged on the wall surface of the lower part of the cathode tube-shaped electrode liner, and the preferable aperture is 2-5 mm, so that the injection and extraction of the sediment by the solution system are facilitated.
As the preferred implementation manner of the embodiment, the two side walls of the PRB reaction wall 3 are made of stainless steel, so that the PRB reaction wall has certain corrosion resistance and can better prolong the service life; meanwhile, a plurality of water permeable holes are formed in the surface; the active filler in the filler groove in the PRB reaction wall is formed by one or a plurality of combinations of nano zero-valent iron (ZVI) biochar, polymer-reed co-pyrolysis biochar and polyaniline.
As a preferred implementation manner of this embodiment, the quantitative liquid adding device 8 is provided with a Y-shaped valve 10, the liquid outlet end of the composite solution tank 7 is connected with the eluent delivery pipeline 5, the control unit 6 and the quantitative liquid adding device 8, the eluent delivery pipeline 5 is connected through the Y-shaped valve 10 of the quantitative liquid adding device 8, and the automatic control of the control unit 6 is utilized to uniformly spray the pit bottom mud polluted by cadmium at the tail end of the eluent delivery pipeline 5 through the spraying device, so that the solution is completely contacted with the bottom mud.
The stabilizer storage tank 9 is connected with the composite conveying pipeline 4, the control unit 6 and the quantitative liquid adding equipment 8, the composite conveying pipeline 4 is connected through the Y-shaped valve 10 of the quantitative liquid adding equipment 8, and the automatic control of the control unit 6 is utilized to uniformly spray pit bottom mud polluted by cadmium between the PRB reaction wall and the cathode electrode tube at the tail end of the composite conveying pipeline 4 through a spraying device.
Preferably, the eluent in the composite solution tank 7 is prepared by mixing and proportioning one or more of glutamic acid GLDA, oxalic acid di-sunflower ester DDA, citric acid CA and sodium chloride in equal proportion; the water-soil ratio of the eluent to the bottom mud soil is (5-10): 1.
Preferably, the stabilizer in the stabilizer tank 9 is 0.3 mol/L sodium sulfide or 0.3 mol/L sodium bisulfate.
Example 2:
referring to fig. 3, the embodiment of the invention also provides a method for repairing the assembled PRB combined electrodynamic cadmium pollution substrate sludge, which specifically comprises the following steps:
the first stage: the repairing micro-unit of the system is inserted into the bottom mud of a cadmium polluted pit, a PRB reaction wall is arranged at a position 25 to cm away from an anode plate electrode, and active filler in a filler groove in the reaction wall is nano zero-valent iron (ZVI) biochar. The programmable direct current power supply is switched on, and the power supply voltage is regulated to 1.25V/cm.
And under the automatic control of a control unit, 0.05 mol/L GLDA in the composite solution tank uniformly sprays pit bottom mud polluted by cadmium for 1h at the tail end of a leaching agent conveying pipeline through a spraying device. The main switch is automatically closed, automatically switched on after being stationary for 2 hours, the repair time is set to be 16 hours, the power is automatically cut off after the repair time is reached, the PRB reaction wall is replaced, and the second repair stage is started.
And a second stage: under the automatic control of the control unit, the extraction pump extracts the solution containing heavy metal cadmium near the cathode tube into the composite solution tank through the composite conveying pipeline (the eluent in the composite solution tank is sprayed in the first stage and is in an empty tank state at present), the power is automatically turned off after 16 hours, the waste liquid in the composite solution tank is collected and discharged, and the third restoration stage is started.
And a third stage: through the automatic control of the control unit, 0.3 mol/L sodium sulfide in the stabilizer storage tank uniformly sprays the cadmium pollution pit bottom mud in the PRB reaction wall and the cathode electrode tube through a spraying device at the tail end of the composite conveying pipeline, and the repairing process is completed after 24 hours, the power is automatically turned off.
After the repair process is finished, the whole repair unit is equally divided into 5 parts according to the distance from the anode to the cathode, the 5 parts are sequentially marked as S1, S2, S3, S4 and S5, and the 5 parts are respectively sampled. And (5) drying the sampling bottom mud to constant weight in a drying oven at 105 ℃ to obtain the pit bottom mud after the cadmium pollution is repaired.
Example 3:
example 3 in comparison with example 2, the other steps and parameters in the repair process are exactly the same as in example 2, except that the rinse agent in the first repair stage is 0.1 mol/L GLDA.
Example 4:
example 4 in comparison with example 2, the other steps and parameters in the repair process were exactly the same as in example 2, except that the rinse agent in the first repair stage was 0.2 mol/L GLDA.
Example 5:
example 5 in comparison with example 2, the other steps and parameters in the repair process are exactly the same as in example 2, except that the rinse agent in the first repair stage is 0.5 mol/L GLDA.
The effect of different concentrations of GLDA as a eluent in examples 2-5 was analyzed in the remediation of cadmium contaminated pit bottom mud in the system.
The cadmium content of each region in the bottom mud is detected by adopting an atomic absorption spectrometry, and fig. 4 is a comparative analysis of the effect of studying the cadmium removal rate in examples 2-5, and as shown in fig. 4, the cadmium removal rate of the part, close to the cathode, of each of examples 2-5 is better.
TABLE 1 soil moisture Change before and after remediation
Meanwhile, the change in the water content of the soil before and after the restoration of examples 2 to 5 was measured in a control manner, and the results are shown in Table 1 above.
Example 6:
example 6 in comparison with example 2, the other steps and parameters in the repair process were exactly the same as in example 2 except that the rinse agent in the first repair stage was a 0.05 mol/L GLDA and CA equal ratio mixed solution.
Meanwhile, the cadmium content after each repair stage of the polluted pit bottom mud in the examples 2 and 6 is detected by adopting an atomic absorption spectrometry. Comparing the cadmium removal rates at different repair time periods in examples 2 and 6, the results are shown in fig. 5, and it is obvious that the effect of the mixed solution of GLDA and CA in equal proportion is improved compared with that of the single GLDA solution.
Example 7:
in comparison with example 2, example 7 was identical to example 2 except that no active filler was added to the filler tank in the PRB reaction wall, and other steps and parameters in the repair process were identical.
Experimental example 8:
compared with examples 2 and 7, in example 8, other steps and parameters in the repairing process are exactly the same as in example 2 except that the active filler in the filler tank in the PRB reaction wall is a combination of nano zero-valent iron (ZVI) biochar and polymer-reed co-pyrolysis biochar in equal proportion.
The application effects of different active fillers in the assembled PRB combined electrodynamic force repair of the pit bottom mud system in the embodiment 2, 7 and 8 are analyzed, and as shown in a result of fig. 6, the cadmium removal rate is obviously improved in the S3-S5 part after the active fillers are added in the filler tank, and the cadmium removal effect is better when the active fillers are proportionally combined by nano zero-valent iron (ZVI) biochar and polymer-reed co-pyrolysis biochar compared with the cadmium removal effect when only nano zero-valent iron (ZVI) biochar is added.
Through the description of the implementation, the person skilled in the art can know that the embodiment of the invention provides the assembled PRB combined electrodynamic force cadmium pollution bottom mud repairing system and method, and the repairing micro units are arranged and are organically combined with the liquid adding units, so that the PRB combined electrodynamic force repairing technology and the in-situ leaching and chemical fixing repairing technology are parallel, the limitation of a single repairing technology is made up, the repairing effect of the bottom mud of the heavy metal cadmium pollution pit pool is enhanced, and the repairing cost is reduced. According to the invention, the sludge is dehydrated while the cadmium pollution of the sludge is repaired in situ, so that the reduction and harmless treatment of the sludge are realized. The system integrally adopts an assembled structure, can realize the detachability and the assembly property of the electrode and the PRB reaction wall through the installation of the preset clamping groove, greatly facilitates the replacement and the recycling of materials, and improves the working efficiency; meanwhile, the number of the assembled microcells and the shape of the repair field can be determined according to the shape and the area of the target polluted field, so that the method has a large-scale application foundation. In the first stage of the method, the eluting agent can be fully contacted with the cadmium polluted bottom mud under the driving action of electric force, so that the eluting and repairing effects are enhanced, and the cost is saved. According to the invention, the liquid adding flow and the liquid flow rate can be set according to different systems, and the bottom mud of the pit polluted by cadmium can be efficiently repaired. According to the invention, part of heavy metal cadmium can be thoroughly removed from the bottom mud of the polluted pit pond by replacing the PRB reaction wall, so that the risk of secondary pollution of the bottom mud is greatly reduced.
The non-illustrated parts of the embodiments of the present invention may be obtained from corresponding product specifications or from prior art in the field, and are well known in the art, and will not be described in detail.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the method disclosed in the embodiment, as it corresponds to the system disclosed in the embodiment, the relevant point is referred to the system part description.
The foregoing has outlined rather broadly the principles and embodiments of the present invention in order that the detailed description of the invention may be better understood, and in order that the present invention may be better understood.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An assembled PRB combined electrodynamic force cadmium pollution substrate sludge repair system, which is characterized by comprising: repair power, a plurality of repair micro unit, liquid feeding unit and control unit, wherein:
the repair power supply is connected with a plurality of repair micro units; the single repair microcell includes: electrode assemblies and PRB reaction walls; wherein,,
the electrode assembly comprises an anode plate electrode and a cathode tubular electrode, wherein the anode plate electrode is arranged into a hexagonal electrode array by taking an electrode tube of the cathode tubular electrode as a center; the PRB reaction wall and the anode plate-shaped electrode are arranged in parallel and positioned in the middle of the anode and the cathode, and form a double-layer hexagonal array together with the anode plate-shaped electrode;
the liquid adding unit comprises: the device comprises a composite solution tank, a stabilizer storage tank, quantitative liquid adding equipment, a leaching agent conveying pipeline and a composite conveying pipeline; wherein,,
the compound solution tank is used for storing a eluting agent or a cadmium-containing solution, the liquid outlet end of the compound solution tank is connected with the quantitative liquid adding equipment and the eluting agent conveying pipeline, and the liquid inlet end is connected with the compound conveying pipeline; the stabilizer storage tank is used for storing a stabilizer and is connected with the quantitative liquid adding equipment and the composite conveying pipeline; the tail ends of the leaching agent conveying pipeline and the compound conveying pipeline are provided with spraying devices;
the control unit is respectively connected with the quantitative liquid adding device, the eluent conveying pipeline and the composite conveying pipeline and is used for controlling conveying of the eluent and the stabilizing agent.
2. The fabricated PRB combined electrodynamic cadmium pollution substrate sludge remediation system of claim 1, further comprising: and the extraction pump is connected with the control unit and is used for extracting the cadmium-containing solution near the cathode tubular electrode into the composite solution tank through the composite conveying pipeline under the control of the control unit.
3. The assembled PRB combined electrodynamic cadmium pollution substrate sludge repair system according to claim 1, wherein the repair micro-unit adopts an assembled structure, and the electrode assembly and the PRB reaction wall are disassembled and assembled by installing a preset clamping groove.
4. The assembled PRB combined electrodynamic cadmium pollution bottom sediment remediation system according to claim 3, wherein the remediation micro-cells are arranged in a honeycomb manner in the pit bottom sediment of the cadmium pollution.
5. The assembled PRB combined electrodynamic cadmium pollution bottom mud repairing system according to claim 1, wherein the repairing power supply is a programmable direct current power supply, the programmable direct current power supply is connected with an electrode assembly of the repairing micro-unit, and the repairing voltage gradient of the programmable direct current power supply is 0.5-2V/cm.
6. The fabricated PRB-combined electrodynamic cadmium pollution matrix repair system according to claim 1, wherein the anode plate electrode and the cathode tubular electrode are both composite plastic conductive electrodes, wherein: the composite plastic comprises the following components: polyethylene composite conductive plastic or polypropylene composite conductive plastic; the outer layers of the anode plate-shaped electrode and the cathode tube-shaped electrode are wrapped with filter screens, and the aperture of each filter screen is 100-1000 mu m; the inner containers of the anode plate-shaped electrode and the cathode tubular electrode are hollow structures; the lower wall surface of the inner container of the cathode tube electrode is provided with a hole, and the aperture of the hole is 2-5 mm.
7. The assembled PRB combined electrodynamic cadmium pollution bottom mud repairing system according to claim 1, wherein two side walls of the PRB reaction wall are made of stainless steel, and a plurality of water permeable holes are formed in the surfaces of the two side walls;
the PRB reaction wall is internally provided with a packing groove, the packing groove is filled with active packing, and the active packing is as follows: nano zero-valent iron biochar, polymer-reed co-pyrolysis biochar and polyaniline.
8. The assembled PRB combined electrodynamic force cadmium pollution bottom mud repairing system according to claim 1, wherein the eluent in the composite solution tank is prepared by mixing and proportioning one or more of the following components in equal proportion: glutamic acid GLDA, oxalic acid di-sunflower ester DDA, citric acid CA and sodium chloride;
the water-soil ratio of the eluent to the bottom mud soil is 5:1-10:1;
the stabilizer in the stabilizer storage tank is sodium sulfide or sodium bisulfate with the concentration of 0.3 mol/L.
9. The method for repairing the cadmium pollution bottom sediment by combining the fabricated PRB and the electrodynamic force is characterized by being applied to the system for repairing the cadmium pollution bottom sediment by combining the fabricated PRB and the electrodynamic force according to any one of claims 1-8, so that the repair of the cadmium pollution bottom sediment in the pit is realized.
10. The method for repairing the assembled PRB combined electrodynamic cadmium pollution substrate sludge according to claim 9, which comprises the following steps:
the first stage: inserting the repairing micro-unit into the bottom mud of the pit polluted by cadmium, transmitting the leaching agent in the composite solution tank to the tail end of a leaching agent conveying pipeline under the control of the control unit, uniformly spraying the bottom mud of the pit polluted by cadmium through a spraying device to ensure that the solution is in full contact with the bottom mud, dissolving cadmium in the bottom mud, and simultaneously, reacting the cadmium-containing solution with the filler in the PRB reaction wall to remove part of cadmium pollutants;
and a second stage: the treated residual liquid continuously migrates to the cathode tubular electrode, under the control of the control unit, the cadmium-containing solution near the cathode tubular electrode is pumped into the composite solution tank through the composite conveying pipeline by the extraction pump, and the cadmium-containing residual liquid collected in the composite solution tank is discharged, so that the cadmium pollution restoration and the sediment dehydration are realized;
and a third stage: under the control of the control unit, the stabilizer in the stabilizer storage tank is transmitted to the tail end of the composite conveying pipeline, the PRB reaction wall and the cadmium pollution pit bottom mud in the cathode electrode tube are uniformly sprayed through the spraying device, and the cadmium in the cadmium-containing solution remained near the cathode electrode tube is stabilized and fixed.
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| WO2011109342A1 (en) * | 2010-03-01 | 2011-09-09 | Mwh Americas, Inc. | Methods and systems for electrochemically induced reduction of contaminants in groundwater, soils and low permeability media |
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