CN212494522U - Soil remediation system for solar hot air enhanced bioelectrochemistry coupling biochar - Google Patents
Soil remediation system for solar hot air enhanced bioelectrochemistry coupling biochar Download PDFInfo
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- CN212494522U CN212494522U CN202021244162.7U CN202021244162U CN212494522U CN 212494522 U CN212494522 U CN 212494522U CN 202021244162 U CN202021244162 U CN 202021244162U CN 212494522 U CN212494522 U CN 212494522U
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Abstract
The utility model provides a soil remediation system of solar hot air enhanced bioelectrochemistry coupling biochar, which comprises a soil filling chamber and an electrochemical reaction chamber which are arranged up and down and are communicated with each other; the soil filling chamber is filled with soil, at least one ventilation pipe is buried in the soil, the ventilation pipe is externally connected with a solar heat collection system, and at least one spraying layer is arranged above the soil filling chamber; and the electrochemical reaction chamber is internally provided with an anode electrode and a cathode electrode which are respectively connected with the solar photovoltaic energy storage system. The utility model discloses doped the biological charcoal in the electrochemical reaction room, the biological charcoal has good electrochemical activity, disperses in the elution waste liquid as the biological charcoal, will strengthen the electric conductivity of elution waste liquid to promote the formation of elution waste liquid conducting network, thereby increase the effective degradation radius of organic pollutant in the elution waste liquid.
Description
Technical Field
The utility model belongs to the technical field of soil remediation, a soil remediation system is related to, especially relate to a soil remediation system of biological electricity chemical coupling charcoal is strengthened to solar hot-blast.
Background
With the rapid development of economy, the problem of soil pollution is more and more prominent. The "running, overflowing, dripping and leaking" of facilities such as many chemical plants, oil production fields, gas stations, material tank areas and the like causes the land to be seriously polluted by petroleum hydrocarbons and other organic compounds which are remained in the soil or migrate into the atmosphere or underground water to pollute the ecological environment and cause direct or indirect harm to the life health of human beings. The land after the enterprise is moved cannot be developed, and accidents caused by improper disposal of polluted land are all the better in recent years. Therefore, the remediation and treatment of the polluted soil become an urgent task in the environmental protection field.
The biological ventilation method is a repair technology for the polluted soil of the type, is used as a soil in-situ repair method combining the soil vapor extraction and the biological repair method, has the advantages of wide application range, low operation cost, no secondary pollution, flexible and simple operation and the like, and has wide application prospect in the aspect of treating the organic polluted soil.
The efficiency and the effect of biological ventilation for repairing the organic matter polluted soil can be enhanced by heating the soil. Especially for soil with low temperature, such as soil in winter or northern area, because of low temperature, the activity of the microbial population in the soil is poor, the organic pollutant contained in the soil is stable, and the soil is adsorbed or absorbed in the soil solution and is not easy to volatilize from the soil, and the indigenous microbes and inoculated microbes in the soil can degrade some macromolecular organic matters which are difficult to volatilize into volatile micromolecular organic matters which are removed by extraction. The soil is properly heated, a proper soil temperature environment is provided for microorganisms, the efficiency of degrading organic matters in the polluted soil by the microorganisms can be promoted, and on the other hand, the soil is heated, so that the organic matters are analyzed from the soil, and the extraction efficiency and effect are improved. The soil is a poor thermal conductor, the heat capacity is large, the heat storage capacity is strong, and the heated soil can not generate severe temperature fluctuation in a short time.
CN204294616U discloses a contaminated soil remediation system by solar thermal desorption, which comprises a contaminant vacuum suction system, a solar heat collection system and a gas filling system, and comprises a heating diffusion well, an extraction well, a concrete hardened ground, a gas filling pipeline, an air compressor, a gas transmission pipeline, a groove type solar heat collector array, a blower, an activated carbon adsorption device, a vacuum pump and an air filter. The patent publication device belongs to solar energy assisted soil vapor extraction, and extracted soil gas is discharged after gas-liquid separation and activated carbon adsorption. The essence of the method is thermal desorption, air is used as a heating medium, the heating efficiency is low, and the method is not suitable for repairing soil polluted by organic matters difficult to volatilize. Nutrient solution and microelement injection system can adjust the soil nutrition constitution in this patent, arouses the degradation activity of microorganism, promotes that it will pollute in the soil difficult volatile macromolecule organic matter and turns into volatile micromolecule organic matter to can improve the restoration effect that the organic matter pollutes soil greatly. The nutrient solution and the trace element injection system can also be used for carrying out microbial inoculation on soil. The function of microbial degradation macromolecular organic matter is fully exerted to this patent, and the cooperation air stripping can have showing the effect.
CN201959978U discloses a device of volatile organic compounds contaminated soil is restoreed to solar energy dystopy, comprises solar energy steam supply system, soil restoration storehouse, water circulating system and connecting tube, and the device utilizes solar energy radiation, obtains the heat through the spotlight, heats the moisture content in the heat absorption pipe in order to provide soil restoration with hot steam, and water circulating system provides required moisture content constantly. The heterotopic repairing device is an heterotopic repairing device, needs to be matched with auxiliary systems for soil excavation, conveying, loading, unloading and the like, is not suitable for being used under the condition that structures and the like on polluted soil are not suitable for excavation, and does not have the ventilation and degradation functions of microorganisms on macromolecular organic matters.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a soil repair system of biological electrochemistry coupling biochar is reinforceed to solar hot-blast, the utility model discloses doped the biochar in electrochemical reaction indoor, the biochar has good electrochemical activity, disperses in the elution waste liquid as the biochar, will certainly strengthen the electric conductivity of elution waste liquid to promote the formation of elution waste liquid conductive network, thereby increase the effective degradation radius of organic pollutant in the elution waste liquid.
To achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a soil repair system of biological electrochemistry coupling biochar is reinforceed to solar hot-blast, soil repair system including arrange from top to bottom and the soil that communicates each other loads room and electrochemical reaction room.
The soil filling chamber is filled with soil, at least one ventilation pipe is buried in the soil, the ventilation pipe is externally connected with a solar heat collection system, and at least one spraying layer is arranged above the soil filling chamber.
And the electrochemical reaction chamber is internally provided with an anode electrode and a cathode electrode which are respectively connected with the solar photovoltaic energy storage system.
The utility model discloses a soil temperature is adjusted as the heat source to the air through heated air as the heat medium to for the oxygen suppliment of soil microorganism, has reinforceed microbial community's in the soil activity, on the one hand, uses with the eluant cooperation, has improved organic pollutant's elution speed in the soil, and on the other hand uses with the nutrient solution cooperation, makes the equilibrium concentration of organic matter in the soil reduce, reduces the residual concentration of organic matter, improves and restores back soil environment quality. The utility model discloses doped the biological charcoal in the electrochemical reaction room, the biological charcoal has good electrochemical activity, disperses in the elution waste liquid as the biological charcoal, will strengthen the electric conductivity of elution waste liquid to promote the formation of elution waste liquid conducting network, thereby increase the effective degradation radius of organic pollutant in the elution waste liquid.
The utility model discloses in, the positive pole electrode is the organic skeleton material of conductivity metal or porous carbon material, and the negative pole electrode is graphite rod or stainless steel net.
Solar energy collection system for slot type solar collector array, be in the same place through series connection or parallel connection by a set of single slot type solar concentrator, utilize the slot type to throw a plane reflection spotlight, with the solar energy gathering on hollow thermal-collecting tube, heat the inside air of hollow thermal-collecting tube, what the slot type solar collector array adopted is solar energy automatic tracking technique, can realize the high-efficient utilization to solar energy.
As an optimal technical scheme of the utility model, soil load room top be provided with two-layer mutually independent spray the layer, spray the layer and the eluant sprays the layer for the nutrient solution respectively.
As an optimized technical scheme, the electrochemical reaction chamber pass through eluent circulation tube coupling eluant and spray the layer, the elution waste liquid that flows into the electrochemical reaction chamber flows back to the eluant after degradation and sprays the layer and circulate and spray soil.
As a preferred technical proposal of the utility model, the eluent circulating pipeline is provided with an eluent storage device.
And the eluent circulation pipeline is also provided with a filtering device.
As an optimized technical proposal of the utility model, the nutrient solution spraying layer is externally connected with a nutrient solution storage device.
As an optimized technical scheme, the layer that sprays including spraying the person in charge, spray and be responsible for and seted up at least one atomizing nozzle along the axis, atomizing nozzle's injection direction towards soil load room.
The utility model discloses in, through spraying the nutrient solution to soil, provide sufficient nutrient substance for the microbial degradation organic matter process in soil, also prevent that soil dehydration leads to microorganism living environment lack of water. Meanwhile, the soil can be supplemented with water and humidified in a proper amount, and excessive removal of water in the soil due to volatilization and leakage of organic pollutants is avoided.
As an optimized technical scheme of the utility model, soil in buried three horizontal ventilation pipes side by side interval arrangement underground.
The inlet ends of the ventilation pipes are combined into one path and then connected into the solar heat collection system.
At least one nozzle is symmetrically arranged on the ventilating pipe along the axial direction.
As an optimal technical scheme, solar photovoltaic energy storage system include electric connection's solar photovoltaic board and battery.
The positive electrode and the negative electrode of the storage battery are respectively connected with the anode electrode and the cathode electrode.
As an optimized technical scheme, soil load room and electrochemical reaction room between be provided with the active carbon supporting layer, obtain the elution waste liquid after the organic pollution in the elution soil of eluant, flow in electrochemical reaction room through the active carbon supporting layer after the elution waste liquid oozes soil.
As an optimized technical proposal of the utility model, the elution waste liquid stored in the electrochemical reaction chamber is dispersed with biochar particles.
The system refers to an equipment system, or a production equipment.
The utility model provides a soil repair system's theory of operation does:
(1) continuously spraying nutrient solution into the soil by the nutrient solution spraying layer, wherein the nutrient solution comprises 0-5 g/L of phosphorus source, 0-100 g/L of carbon source, 0-10 g/L of nitrogen source and other nutrient substances, and the phosphorus source comprises sodium dihydrogen phosphate and/or disodium hydrogen phosphate; the carbon source comprises one or the combination of at least two of glucose, sodium acetate, sodium formate or sucrose; the nitrogen source is ammonium chloride and/or ammonium sulfate; the nutrients comprise vitamins and/or amino acids;
(2) the air is heated to 30-40 ℃ by the solar heat collection system and then sprayed into the soil through the ventilation pipe, and microorganisms in the soil degrade organic pollutants in the soil under the activation effect of the nutrient solution;
(3) the eluent spraying layer intermittently sprays the eluent into the soil, the eluent comprises 0-100 mg/L of stearic acid, quaternary ammonium salt, lecithin or fatty glyceride, the time of one-time spraying is 10-20 min, and the interval time between two adjacent times of spraying of the eluent is 2-3 min;
(4) the method comprises the steps that an elution waste liquid is formed after organic pollutants in soil are eluted by an eluent, the elution waste liquid flows into an electrochemical reaction chamber after seeping out of the soil, biochar particles arranged in the electrochemical reaction chamber are dispersed in the elution waste liquid, biochar accounts for 1-6 w% of the mass of the elution waste liquid, solar photovoltaic panels convert solar energy into electric energy and then store the electric energy in storage batteries, and the organic pollutants in the elution waste liquid are degraded into micromolecules and CO under the action of current2And H2And O, returning the degraded elution waste liquid to an eluent spraying layer from an eluent circulating pipeline to circularly spray the soil.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses a soil temperature is adjusted as the heat source to the air through heated air as the heat medium to for the oxygen suppliment of soil microorganism, has reinforceed microbial community's in the soil activity, on the one hand, uses with the eluant cooperation, has improved organic pollutant's elution speed in the soil, and on the other hand uses with the nutrient solution cooperation, makes the equilibrium concentration of organic matter in the soil reduce, reduces the residual concentration of organic matter, improves and restores back soil environment quality.
(2) The utility model discloses doped the biological charcoal in the electrochemical reaction room, the biological charcoal has good electrochemical activity, disperses in the elution waste liquid as the biological charcoal, will strengthen the electric conductivity of elution waste liquid to promote the formation of elution waste liquid conducting network, thereby increase the effective degradation radius of organic pollutant in the elution waste liquid.
Drawings
Fig. 1 is a schematic structural diagram of a soil remediation system according to an embodiment of the present invention.
Wherein, 1-solar energy heat collecting system; 2-a soil filling chamber; 3-an electrochemical reaction chamber; 4-an activated carbon support layer; 5-nutrient solution spraying layer; 6-eluent spraying layer; 7-eluent storage device; 8-nutrient solution storage device; 9-a filtration device; 10-a cathode electrode; 11-an anode electrode; 12-biochar; 13-a storage battery; 14-solar photovoltaic panel; 15-ventilating pipe.
Detailed Description
It is to be understood that in the description of the present invention, the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for the purpose of convenience and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
It should be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected" and "connected" in the description of the present invention are to be construed broadly, and may for example be fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
In a specific embodiment, the utility model provides a soil remediation system of biological electrochemistry coupling biochar is strengthened to solar hot-blast, soil remediation system as shown in figure 1, including the soil that arranges from top to bottom and intercommunication fills room 2 and electrochemical reaction room 3. Soil is filled in the soil filling chamber 2, at least one ventilation pipe 15 is buried in the soil, the ventilation pipe 15 is externally connected with a solar heat collection system 1, and at least one spraying layer is arranged above the soil filling chamber 2. An anode electrode 11 and a cathode electrode 10 are arranged in the electrochemical reaction chamber 3, and the anode electrode 11 and the cathode electrode 10 are respectively connected with a solar photovoltaic energy storage system.
Two mutually independent spraying layers, namely a nutrient solution spraying layer 5 and an eluent spraying layer 6, are arranged above the soil filling chamber 2. The electrochemical reaction chamber 3 is connected with an eluent spraying layer 6 through an eluent circulating pipeline, the elution waste liquid flowing into the electrochemical reaction chamber 3 is subjected to degradation treatment and then flows back to the eluent spraying layer 6 to circularly spray the soil, and an eluent storage device 7 and a filtering device 9 are sequentially arranged on the eluent circulating pipeline along the flow direction of the elution waste liquid. The nutrient solution spraying layer 5 is externally connected with a nutrient solution storage device 8. The layer that sprays is responsible for including spraying, sprays to be responsible for and has seted up at least one atomizing nozzle along the axis, and atomizing nozzle's injection direction is towards soil filling chamber 2.
Three ventilation pipes 15 which are transversely arranged side by side at intervals are buried in the soil, and the inlet ends of the ventilation pipes 15 are combined into one path and then connected into the solar heat collection system 1. At least one nozzle is symmetrically arranged on the ventilation pipe 15 along the axial direction.
The solar photovoltaic energy storage system comprises a solar photovoltaic panel 14 and a storage battery 13 which are electrically connected, and the positive electrode and the negative electrode of the storage battery 13 are respectively connected with the anode electrode 11 and the cathode electrode 10.
An active carbon supporting layer 4 is arranged between the soil filling chamber 2 and the electrochemical reaction chamber 3, an elution waste liquid is obtained after the organic pollution in the soil is eluted by the eluent, and the elution waste liquid flows into the electrochemical reaction chamber 3 through the active carbon supporting layer 4 after seeping out of the soil. Biochar 12 particles are dispersed in the elution waste liquid in the electrochemical reaction chamber 3.
In another embodiment, the present invention provides a method for restoring soil by using solar hot air to intensify bio-electrochemical coupling biochar, wherein the method comprises the following steps:
(1) the nutrient solution spraying layer 5 continuously sprays nutrient solution into the soil, the nutrient solution comprises 0-5 g/L of phosphorus source, 0-100 g/L of carbon source, 0-10 g/L of nitrogen source and other nutrient substances, and the phosphorus source comprises sodium dihydrogen phosphate and/or disodium hydrogen phosphate; the carbon source comprises one or the combination of at least two of glucose, sodium acetate, sodium formate or sucrose; the nitrogen source is ammonium chloride and/or ammonium sulfate; the nutrients comprise vitamins and/or amino acids;
(2) the air is heated to 30-40 ℃ by the solar heat collection system 1 and then sprayed into the soil through the ventilation pipe 15, and microorganisms in the soil degrade organic pollutants in the soil under the activation action of the nutrient solution;
(3) the eluent spraying layer 6 intermittently sprays the eluent into the soil, the eluent comprises 0-100 mg/L of stearic acid, quaternary ammonium salt, lecithin or fatty glyceride, the time of one spraying is 10-20 min, and the interval time between two adjacent spraying of the eluent is 2-3 min;
(4) the method comprises the steps that an elution waste liquid is formed after organic pollutants in soil are eluted by an eluent, the elution waste liquid flows into an electrochemical reaction chamber 3 after seeping out of the soil, biochar 12 particles arranged in the electrochemical reaction chamber 3 are dispersed in the elution waste liquid, the biochar 12 accounts for 1-6 w% of the mass of the elution waste liquid, a solar photovoltaic panel 14 converts solar energy into electric energy and then stores the electric energy in a storage battery 13, and the organic pollutants in the elution waste liquid are degraded into micromolecules and CO under the action of current2And H2And O, returning the degraded elution waste liquid to the eluent spraying layer 6 from the eluent circulating pipeline to circularly spray the soil.
Wherein, the biochar 12 particles in the step (4) are prepared by the following method:
(a) chopping wheat straws, putting the chopped wheat straws into a quartz tube, pyrolyzing the wheat straws for 1-2 hours at the temperature of 300-900 ℃, and introducing nitrogen into the quartz tube in the pyrolysis process;
(b) cooling to room temperature after pyrolysis, taking out, grinding, sieving, fully cleaning by using 0.2-0.6 mol/L HCl solution to remove ash and soluble salt remained in the pyrolysis process of the biochar 12, and then cleaning by using distilled water until the cleaning solution becomes neutral;
(c) and drying the cleaned biochar 12 at 100-120 ℃ for 20-24 h.
Example 1
The utility model provides a soil remediation method of solar hot-blast intensification bioelectrochemistry coupling biochar, the remediation method include:
(1) the nutrient solution spraying layer 5 continuously sprays nutrient solution into the soil, and the nutrient solution comprises 1g/L sodium dihydrogen phosphate, 10g/L glucose, 2g/L ammonium chloride, vitamins and amino acids;
(2) air is heated to 30 ℃ by the solar heat collection system 1 and then is sprayed into soil by the vent pipe 15, and microorganisms in the soil degrade organic pollutants in the soil under the activation action of the nutrient solution;
(3) the eluent spraying layer 6 intermittently sprays eluent into the soil, wherein the eluent comprises 10mg/L of stearic acid, the time of one-time spraying is 20min, and the interval time between two adjacent times of spraying of the eluent is 3 min;
(4) the organic pollutants in the soil are eluted by the eluent to form an elution waste liquid, the elution waste liquid flows into the electrochemical reaction chamber 3 after seeping out of the soil, biochar 12 particles arranged in the electrochemical reaction chamber 3 are dispersed in the elution waste liquid, the biochar 12 accounts for 1 w% of the mass of the elution waste liquid, the solar photovoltaic panel 14 converts solar energy into electric energy and stores the electric energy in the storage battery 13, and the organic pollutants in the elution waste liquid are degraded into micromolecules and CO under the action of current2And H2And O, returning the degraded elution waste liquid to the eluent spraying layer 6 from the eluent circulating pipeline to circularly spray the soil.
Wherein, the biochar 12 particles in the step (4) are prepared by the following method:
(a) chopping wheat straws, putting the chopped wheat straws into a quartz tube, pyrolyzing the wheat straws for 2 hours at 300 ℃, and introducing nitrogen into the quartz tube in the pyrolysis process;
(b) cooling to room temperature after pyrolysis, taking out, grinding, sieving, fully cleaning by using 0.2mol/L HCl solution to remove ash and soluble salt remained in the pyrolysis process of the biochar 12, and then cleaning by using distilled water until the cleaning solution becomes neutral;
(c) the washed biochar 12 is dried for 24h at 100 ℃.
Example 2
The utility model provides a soil remediation method of solar hot-blast intensification bioelectrochemistry coupling biochar, the remediation method include:
(1) the nutrient solution spraying layer 5 continuously sprays nutrient solution into the soil, and the nutrient solution comprises 2g/L of disodium hydrogen phosphate, 30g/L of sodium acetate, 4g/L of ammonium sulfate, vitamins and amino acids;
(2) air is heated to 32 ℃ by the solar heat collection system 1 and then is sprayed into soil by the vent pipe 15, and microorganisms in the soil degrade organic pollutants in the soil under the activation action of the nutrient solution;
(3) the eluent spraying layer 6 sprays eluent into the soil intermittently, wherein the eluent comprises 30mg/L quaternary ammonium salt, the time of one spraying is 17min, and the interval time between two adjacent spraying of the eluent is 2.7 min;
(4) the organic pollutants in the soil are eluted by the eluent to form an elution waste liquid, the elution waste liquid flows into the electrochemical reaction chamber 3 after seeping out of the soil, biochar 12 particles arranged in the electrochemical reaction chamber 3 are dispersed in the elution waste liquid, the biochar 12 accounts for 2 w% of the mass of the elution waste liquid, the solar photovoltaic panel 14 converts solar energy into electric energy and stores the electric energy in the storage battery 13, and the organic pollutants in the elution waste liquid are degraded into micromolecules and CO under the action of current2And H2And O, returning the degraded elution waste liquid to the eluent spraying layer 6 from the eluent circulating pipeline to circularly spray the soil.
Wherein, the biochar 12 particles in the step (4) are prepared by the following method:
(a) cutting wheat straws, putting the cut wheat straws into a quartz tube, pyrolyzing the wheat straws for 1.7h at 450 ℃, and introducing nitrogen into the quartz tube in the pyrolysis process;
(b) cooling to room temperature after pyrolysis, taking out, grinding, sieving, fully cleaning by using 0.3mol/L HCl solution to remove ash and soluble salt remained in the pyrolysis process of the biochar 12, and then cleaning by using distilled water until the cleaning solution becomes neutral;
(c) the washed biochar 12 was dried at 105 ℃ for 23 h.
Example 3
The utility model provides a soil remediation method of solar hot-blast intensification bioelectrochemistry coupling biochar, the remediation method include:
(1) the nutrient solution spraying layer 5 continuously sprays nutrient solution into the soil, and the nutrient solution comprises 3g/L of sodium dihydrogen phosphate, 50g/L of sodium formate, 6g/L of ammonium chloride, vitamins and amino acids;
(2) air is heated to 35 ℃ by the solar heat collection system 1 and then is sprayed into soil by the vent pipe 15, and microorganisms in the soil degrade organic pollutants in the soil under the activation action of the nutrient solution;
(3) the eluent spraying layer 6 sprays eluent into the soil intermittently, wherein the eluent comprises 50mg/L of lecithin, the time of one spraying is 15min, and the interval time between two adjacent spraying of the eluent is 2.5 min;
(5) the organic pollutants in the soil are eluted by the eluent to form an elution waste liquid, the elution waste liquid flows into the electrochemical reaction chamber 3 after seeping out of the soil, biochar 12 particles arranged in the electrochemical reaction chamber 3 are dispersed in the elution waste liquid, the biochar 12 accounts for 3 w% of the mass of the elution waste liquid, the solar photovoltaic panel 14 converts solar energy into electric energy and stores the electric energy in the storage battery 13, and the organic pollutants in the elution waste liquid are degraded into micromolecules and CO under the action of current2And H2And O, returning the degraded elution waste liquid to the eluent spraying layer 6 from the eluent circulating pipeline to circularly spray the soil.
Wherein, the biochar 12 particles in the step (4) are prepared by the following method:
(a) cutting wheat straws, putting the cut wheat straws into a quartz tube, pyrolyzing the wheat straws for 1.5h at the temperature of 600 ℃, and introducing nitrogen into the quartz tube in the pyrolysis process;
(b) cooling to room temperature after pyrolysis, taking out, grinding, sieving, fully cleaning by using 0.4mol/L HCl solution to remove ash and soluble salt remained in the pyrolysis process of the biochar 12, and then cleaning by using distilled water until the cleaning solution becomes neutral;
(c) the washed biochar 12 was dried at 110 ℃ for 22 h.
Example 4
The utility model provides a soil remediation method of solar hot-blast intensification bioelectrochemistry coupling biochar, the remediation method include:
(1) the nutrient solution spraying layer 5 continuously sprays nutrient solution into the soil, and the nutrient solution comprises 4g/L of sodium dihydrogen phosphate, 70g/L of cane sugar, 8g/L of ammonium sulfate, vitamins and amino acids;
(2) air is heated to 37 ℃ by the solar heat collection system 1 and then is sprayed into soil by the vent pipe 15, and microorganisms in the soil degrade organic pollutants in the soil under the activation action of the nutrient solution;
(3) the eluent spraying layer 6 intermittently sprays eluent into the soil, wherein the eluent comprises 70-100 mg/L of fatty glyceride, the time of one spraying is 13min, and the interval time between two adjacent spraying of the eluent is 2.3 min;
(4) the organic pollutants in the soil are eluted by the eluent to form an elution waste liquid, the elution waste liquid flows into the electrochemical reaction chamber 3 after seeping out of the soil, biochar 12 particles arranged in the electrochemical reaction chamber 3 are dispersed in the elution waste liquid, the biochar 12 accounts for 5 w% of the mass of the elution waste liquid, the solar photovoltaic panel 14 converts solar energy into electric energy and stores the electric energy in the storage battery 13, and the organic pollutants in the elution waste liquid are degraded into micromolecules and CO under the action of current2And H2And O, returning the degraded elution waste liquid to the eluent spraying layer 6 from the eluent circulating pipeline to circularly spray the soil.
Wherein, the biochar 12 particles in the step (4) are prepared by the following method:
(a) cutting wheat straws, putting the cut wheat straws into a quartz tube, pyrolyzing the wheat straws for 1.3h at 750 ℃, and introducing nitrogen into the quartz tube in the pyrolysis process;
(b) cooling to room temperature after pyrolysis, taking out, grinding, sieving, fully cleaning by using 0.5mol/L HCl solution to remove ash and soluble salt remained in the pyrolysis process of the biochar 12, and then cleaning by using distilled water until the cleaning solution becomes neutral;
(c) the washed biochar 12 was dried at 115 ℃ for 21 h.
Example 5
The utility model provides a soil remediation method of solar hot-blast intensification bioelectrochemistry coupling biochar, the remediation method include:
(1) the nutrient solution spraying layer 5 continuously sprays nutrient solution into the soil, and the nutrient solution comprises 5g/L sodium dihydrogen phosphate, 100g/L glucose, 10g/L ammonium chloride, vitamins and amino acids;
(2) air is heated to 40 ℃ by the solar heat collection system 1 and then is sprayed into soil by the ventilation pipe 15, and microorganisms in the soil degrade organic pollutants in the soil under the activation action of the nutrient solution;
(3) the eluent spraying layer 6 intermittently sprays eluent into the soil, wherein the eluent comprises 100mg/L stearic acid, the time of one-time spraying is 10min, and the interval time between two adjacent times of spraying of the eluent is 2 min;
(4) the organic pollutants in the soil are eluted by the eluent to form an elution waste liquid, the elution waste liquid flows into the electrochemical reaction chamber 3 after seeping out of the soil, biochar 12 particles arranged in the electrochemical reaction chamber 3 are dispersed in the elution waste liquid, the biochar 12 accounts for 6 w% of the mass of the elution waste liquid, the solar photovoltaic panel 14 converts solar energy into electric energy and stores the electric energy in the storage battery 13, and the organic pollutants in the elution waste liquid are degraded into micromolecules and CO under the action of current2And H2And O, returning the degraded elution waste liquid to the eluent spraying layer 6 from the eluent circulating pipeline to circularly spray the soil.
Wherein, the biochar 12 particles in the step (4) are prepared by the following method:
(a) cutting wheat straws, putting the cut wheat straws into a quartz tube, pyrolyzing the wheat straws for 1h at 900 ℃, and introducing nitrogen into the quartz tube in the pyrolysis process;
(b) cooling to room temperature after pyrolysis, taking out, grinding, sieving, fully cleaning by using 0.6mol/L HCl solution to remove ash and soluble salt remained in the pyrolysis process of the biochar 12, and then cleaning by using distilled water until the cleaning solution becomes neutral;
(c) the washed biochar 12 was dried at 120 ℃ for 20 h.
The applicant states that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present invention are within the protection scope and the disclosure scope of the present invention.
Claims (10)
1. A soil remediation system for solar hot air enhanced bioelectrochemistry coupling biochar is characterized by comprising a soil filling chamber and an electrochemical reaction chamber which are arranged up and down and are communicated with each other;
the soil filling chamber is filled with soil, at least one ventilation pipe is buried in the soil, the ventilation pipe is externally connected with a solar heat collection system, and at least one spraying layer is arranged above the soil filling chamber;
and the electrochemical reaction chamber is internally provided with an anode electrode and a cathode electrode which are respectively connected with the solar photovoltaic energy storage system.
2. The soil remediation system of claim 1 wherein two separate spray levels, a nutrient solution spray level and an eluent spray level, are provided above the soil loading chamber.
3. The soil remediation system of claim 2 wherein the electrochemical reaction chamber is connected to the eluent spray layer via an eluent circulation line, and the effluent from the electrochemical reaction chamber is degraded and then returned to the eluent spray layer for circular spraying of the soil.
4. The soil remediation system of claim 3 wherein the eluent circulation line is provided with an eluent storage device;
and the eluent circulation pipeline is also provided with a filtering device.
5. The soil remediation system of claim 4 wherein the nutrient solution spray layer is externally connected to a nutrient solution storage device.
6. The soil remediation system of claim 5 wherein the spray layer comprises a main spray pipe, the main spray pipe having at least one atomizing nozzle disposed along an axis, the atomizing nozzle having a spray direction directed toward the soil loading chamber.
7. The soil remediation system of claim 6 wherein said soil has three laterally spaced apart ventilation pipes embedded therein;
the inlet ends of the ventilation pipes are combined into one path and then connected into the solar heat collection system;
at least one nozzle is symmetrically arranged on the ventilating pipe along the axial direction.
8. The soil remediation system of claim 7, wherein the solar photovoltaic energy storage system comprises a solar photovoltaic panel and a battery electrically connected;
the positive electrode and the negative electrode of the storage battery are respectively connected with the anode electrode and the cathode electrode.
9. The soil remediation system of claim 8, wherein an activated carbon support layer is disposed between the soil filling chamber and the electrochemical reaction chamber, the eluent elutes organic pollutants in the soil to obtain an eluted waste solution, and the eluted waste solution seeps out of the soil and flows into the electrochemical reaction chamber through the activated carbon support layer.
10. The soil remediation system of claim 9 wherein the spent eluant stored within the electrochemical reaction chamber has biochar particles dispersed therein.
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| CN111906135A (en) * | 2020-06-29 | 2020-11-10 | 广东佳德环保科技有限公司 | Soil remediation system and method for solar hot air enhanced bioelectrochemistry coupling biochar |
| CN114858895A (en) * | 2022-05-07 | 2022-08-05 | 江苏科技大学 | Testing device and testing method for electrochemically consolidating, draining and circularly heating local soil body of cathode |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111906135A (en) * | 2020-06-29 | 2020-11-10 | 广东佳德环保科技有限公司 | Soil remediation system and method for solar hot air enhanced bioelectrochemistry coupling biochar |
| CN114858895A (en) * | 2022-05-07 | 2022-08-05 | 江苏科技大学 | Testing device and testing method for electrochemically consolidating, draining and circularly heating local soil body of cathode |
| CN114858895B (en) * | 2022-05-07 | 2023-09-22 | 江苏科技大学 | Test device and test method for electrochemical consolidation drainage circulation heating cathode local soil body |
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