CN210411897U - Device for reinforcing microbial remediation of petroleum organic matter contaminated soil by two-dimensional alternating current electric field - Google Patents
Device for reinforcing microbial remediation of petroleum organic matter contaminated soil by two-dimensional alternating current electric field Download PDFInfo
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- CN210411897U CN210411897U CN201920732115.8U CN201920732115U CN210411897U CN 210411897 U CN210411897 U CN 210411897U CN 201920732115 U CN201920732115 U CN 201920732115U CN 210411897 U CN210411897 U CN 210411897U
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Abstract
The utility model discloses a device of microorganism remediation petroleum type organic matter pollutes soil is reinforceed to two dimension alternating current electric field, the utility model discloses apply the alternating current electric field of two dimension quadrature in petroleum type organic matter pollutes prosthetic bioreactor of soil, utilize electric effect and electrochemical oxidation under the alternating current electric field effect, reinforce the degradation effect of petroleum degradation microbial inoculum to petroleum type organic matter. The electric effect induced by the two-dimensional orthogonal alternating current electric field can promote substances in soil to do small-scale reciprocating motion in a plane, contact and mass transfer between nutrient substances, pollutants and the petroleum degradation microbial inoculum are strengthened, meanwhile, the electrochemical oxidation reaction generated on the surface of the electrode can be cooperated with the petroleum degradation microbial inoculum to degrade petroleum organic matters, the degradation effect of the petroleum degradation microbial inoculum on the petroleum organic matters is finally improved, and the repair efficiency is improved.
Description
Technical Field
The utility model belongs to the technical field of dystopy microbial remediation petroleum type organic matter pollutes soil, concretely relates to device of microbial remediation petroleum type organic matter pollution soil is reinforceed to two dimension alternating current electric field.
Background
The national survey bulletin of soil pollution published in 2014 shows that the polluted soil in China reaches 105 ten thousand square kilometers, wherein the heavily polluted soil is 7 thousand square kilometers, and the main pollutants comprise heavy metals and organic matters. Compared with the heavy metal pollution of soil, the organic pollution is more difficult to treat due to complex components and various varieties. Petroleum organic matters, which are difficult to degrade, are mainly divided into alkanes and aromatic hydrocarbons (monocyclic aromatic hydrocarbons and polycyclic aromatic hydrocarbons), and the properties and fertility of soil are changed after the petroleum organic matters enter the soil, and serious harm is caused to crops growing on the soil and people and livestock related to food chains. Therefore, it is necessary to find an economical and efficient remediation technology for treating the soil contaminated by petroleum organic matters.
The microbial remediation technology is one of the common petroleum organic matter contaminated soil remediation technologies at present, and refers to a process of degrading toxic and harmful pollutants in soil into non-toxic and harmless products by using the growth and metabolism effects of microorganisms. The microbial remediation technology has the characteristics of low economic cost and no secondary pollution, and is widely applied at home and abroad. However, due to mass transfer limitations of nutrient substances, pollutants and the like in soil, the microbial remediation technology also has the problems of long degradation period and low remediation efficiency.
Research shows that the electric restoration technology applies a direct current electric field in a soil medium to induce substances in the soil to generate electric effects (electroosmosis, electromigration and electrophoresis), strengthen the movement of each substance in the soil, improve the probability of contact and utilization of microorganisms to other substances and further improve the degradation efficiency of the microorganisms. At the same time, electrochemical oxidation reactions occurring at the electrode surface can oxidize and degrade some of the contaminants. Therefore, the electric restoration technology and the microbial restoration technology are coupled, so that the restoration effect of the microbes can be enhanced, and the restoration efficiency is improved.
Disclosure of Invention
To the defect that exists among the prior art, the utility model aims to provide a device of petroleum type organic matter contaminated soil is restoreed to two-dimentional alternating current electric field intensive microorganism, restores the looks coupling with alternating current electric field and oil degradation microbial inoculum. The alternating current electric field is similar to a direct current electric field with constantly changing directions, so that various substances (such as ions, organic pollutants, microorganisms and the like) in soil can be promoted to perform small-scale reciprocating motion under the action of an electric effect, the contact and mass transfer between nutrient substances, pollutants and the petroleum degradation microbial inoculum are enhanced, the degradation effect of the petroleum degradation microbial inoculum on petroleum organic matters is finally improved, and the remediation efficiency is improved.
The utility model discloses the concrete technical scheme who adopts as follows:
the utility model discloses a device for reinforcing microorganisms to restore petroleum organic matter polluted soil by a two-dimensional alternating current electric field, which comprises a bioreactor, a sealing cover with holes, a control system, a spraying system, a movable stirring system, a movable sampling monitoring system and a guide rail; the bioreactor is arranged in the middle of the guide rail, is square, and is internally used as a reaction area, and two pairs of sheet DSA electrodes are arranged on the four inner walls of the bioreactor; the sealing cover with the holes is arranged at the top of the bioreactor, and a plurality of round holes are formed in the sealing cover with the holes;
the spraying system consists of a storage tank and a spraying pipeline, one end of the spraying pipeline is connected with the storage tank, and the other end of the spraying pipeline penetrates through a round hole in the sealing cover with the hole and extends into the bioreactor; the control system is provided with an alternating current power supply and a PLC automatic control system, the alternating current power supply is used for applying alternating current voltage to the two pairs of DSA electrodes, and the PLC automatic control system is used for controlling the spraying system, the movable stirring system and the movable sampling monitoring system; the movable stirring system is arranged on the guide rail and comprises a first lifting shaft and a plurality of stirring rollers connected to the first lifting shaft; the movable sampling monitoring system is arranged on the guide rail and comprises a second lifting shaft and a plurality of samplers connected to the second lifting shaft.
Preferably, the four inner walls of the bioreactor are all attached with sheet DSA electrodes. The sheet DSA electrode can ensure that the electric field intensity in the soil is uniformly distributed after voltage is applied, has a certain electrocatalytic oxidation effect and can be used for degrading pollutants in cooperation with a petroleum degrading microbial inoculum.
Preferably, the sealing cap with holes is provided with 4 rectangular holes for electrode placement.
Preferably, the control system comprises an alternating current power supply and a PLC control system. The alternating current power supply consists of a transformer, an alternating current voltage stabilizer and a voltage current display, and can respectively apply stable sinusoidal alternating current to the two pairs of DSA electrodes. The PLC automatic control system is used for controlling the spraying of the spraying system, the movement of the movable stirring system and the movable sampling monitoring system.
Preferably, the spraying system consists of a storage tank and a spraying pipeline. The storage tanks are respectively used for storing the soil additive solution and the petroleum degrading bacteria agent and can be controlled by the control system to automatically spray.
Preferably, the movable stirring system comprises a lifting shaft and a stirring roller. The stirring roller is a solid stainless steel bar and is inserted into soil for stirring through the lifting of the lifting shaft. The movement of the system on the guide rail and the lifting of the lifting shaft are controlled by a PLC automatic control system in the control system.
Preferably, the mobile sampling monitoring system comprises a lifting shaft and a sampler. The sampler is a hollow stainless steel rod and is inserted into soil for sampling through the lifting of the lifting shaft. The soil sample can be taken down from the hollow sampler. The movement of the system on the guide rail and the lifting of the lifting shaft are controlled by a PLC automatic control system in the control system.
The utility model discloses the application method of device as follows:
1) adding polluted soil into the bioreactor, covering the bioreactor with a sealing cover with holes, injecting soil additives into the polluted soil through a spraying system, and moving a movable stirring system on a guide rail to enable a stirring roller to be positioned right above a round hole in the sealing cover with holes; controlling the first lifting shaft to contract, enabling the stirring roller to enter the bioreactor and be inserted into the polluted soil, and stirring the polluted soil by using the rotation of the stirring roller so as to adjust the physicochemical property of the polluted soil; after the adjustment is finished, the movable stirring system is reset to the initial position;
2) spraying the activated petroleum degrading microbial inoculum to the polluted soil through a spraying system (4) and uniformly stirring by using a stirring system (5);
3) applying sinusoidal alternating current on the two pairs of DSA electrodes (8) by using an alternating current power supply in the control system (3) respectively;
4) moving the movable sampling monitoring system on the guide rail at set time intervals; make the sampler be located the sealed round hole that covers on the hole directly over, control second lift axle shrink, the sampler gets into bioreactor inside and inserts and take a sample in the contaminated soil for the analysis detects.
The strain of the petroleum degrading microbial inoculum is sold in the market. The petroleum degrading bacteria agent is firstly inoculated into a glucose culture medium to be activated for 3 days, so as to obtain the activated petroleum degrading bacteria agent. The spraying amount of the activated petroleum degrading bacteria agent is 0.25-0.5L per ton of polluted soil.
Further preferably, the soil additive in step 1) is used for adjusting the physicochemical properties of soil, and comprises water, sodium nitrate, ammonium sulfate and dipotassium hydrogen phosphate.
Further preferably, the physicochemical property of the polluted soil regulation in the step 1) is that the water content of the polluted soil is regulated to be 30% -35%, and the pH of the polluted soil is regulated to be 6-8. The petroleum degrading bacteria agent provides a proper soil environment.
Preferably, the adjusting of the physicochemical properties of the polluted soil in the step 1) further comprises adjusting the mass ratio of carbon, nitrogen and phosphorus in the polluted soil to be 100: 5-10: 1. Wherein the nitrogen used for the adjustment is provided by sodium nitrate and ammonium sulphate and the phosphorus is provided by dipotassium hydrogen phosphate. Therefore, the proportion of sodium nitrate, ammonium sulfate and dipotassium hydrogen phosphate in the soil additive is required to be adjusted according to the concentration of organic carbon, quick-acting nitrogen and quick-acting phosphorus in the polluted soil, wherein the mass ratio of the sodium nitrate to the ammonium sulfate is preferably 1: 1.
Further preferably, the frequency of the alternating current electric field in the step 3) is 50Hz, and the peak intensity (i.e. voltage across the electrodes/electrode distance) is 50-100V/m. Since a sinusoidal ac power is used, the peak intensity is the electric field intensity when the sinusoidal ac voltage is at the peak. In this process, the voltage output by the power supply needs to be kept stable.
More preferably, the petroleum-based organic pollution is one or more of straight-chain hydrocarbon pollution, branched-chain hydrocarbon pollution or aromatic hydrocarbon pollution.
Compared with the prior art, the utility model, the beneficial effect who has is:
compared with the traditional bioreactor, the electric effect induced by the applied two-dimensional alternating current electric field can enable substances in the soil to do small-scale reciprocating motion in a two-dimensional plane, and contact and mass transfer between nutrient substances, pollutants and the petroleum degrading bacteria agent are strengthened. Meanwhile, the DSA electrode has a strong electrochemical catalytic oxidation effect and can be used for degrading in cooperation with a petroleum degrading microbial inoculum, so that the microbial remediation efficiency is improved, and the economic cost and the time cost are saved.
Drawings
FIG. 1 is a schematic view of an apparatus for repairing soil contaminated by petroleum organic substances with microorganisms enhanced by an alternating current electric field;
FIG. 2 is a schematic view of the structure of a bioreactor;
FIG. 3 is a schematic view of a seal cap with a hole;
in the figure: the device comprises a bioreactor-1, a sealing cover with holes-2, a control system-3, a spraying system-4, a movable stirring system-5, a movable sampling monitoring system-6, a guide rail-7, a DSA electrode-8, a storage tank-9, a spraying pipeline-10, a lifting shaft-11, a stirring roller-12 and a sampler-13.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, so that those skilled in the art can better understand the advantages and features of the present invention, thereby defining the protection scope of the present invention more clearly. The described embodiments of the present invention are merely intended to illustrate some embodiments of the invention, and not to limit it to all embodiments. It will be apparent to those skilled in the art that modifications may be made to the above-described embodiments or equivalents may be substituted for elements thereof. Based on the examples in the present invention, other embodiments obtained by a person of ordinary skill in the art without creative efforts all belong to the protection scope of the present invention.
A device for reinforcing the restoration of petroleum organic matter polluted soil by microorganisms through a two-dimensional alternating current electric field as shown in figures 1-3 is constructed and comprises a bioreactor 1, a sealing cover with holes 2, a control system 3, a spraying system 4, a movable stirring system 5, a movable sampling monitoring system 6 and a guide rail 7.
The four walls of the bioreactor 1 are all attached with the sheet DSA electrodes 8, so that the electric field intensity in the soil can be uniformly distributed after voltage is applied, and the bioreactor has a certain electrocatalytic oxidation effect and can be used for degrading pollutants in cooperation with a petroleum degradation microbial inoculum.
The perforated sealing cover tape 2 has 4 rectangular holes for electrode placement and 4 round holes for spraying, stirring or sampling monitoring.
The control system 3 comprises an alternating current power supply and a PLC control system and is integrated in a box body. The alternating current power supply comprises a transformer, an alternating current voltage stabilizer and a voltage and current display and is used for applying sinusoidal alternating current to the two pairs of DSA electrodes 8, and the frequency of the alternating current is 50 Hz. The PLC automatic control system is used for controlling the spraying system 4, the movable stirring system 5 and the movable sampling monitoring system 6.
The spraying system 4 comprises two sets of storage tanks 9 and a spraying pipeline 10, which are respectively used for spraying soil additives and petroleum degrading bacteria agents and can control automatic spraying through the control system 3. The soil additive is used for regulating the physical and chemical properties of soil and comprises water, sodium nitrate, ammonium sulfate and dipotassium hydrogen phosphate. The petroleum degrading bacteria agent is purchased from the market, and is firstly inoculated into a glucose culture medium to be activated for 3 days, so as to obtain the activated petroleum degrading bacteria agent for later use. 0.25-0.5L of petroleum degrading bacteria agent is sprayed in each ton of polluted soil.
The movable stirring system 5 includes a lifting shaft 11 and a stirring roller 12. The stirring roller 12 is a solid stainless steel rod, and is inserted into soil through the lifting shaft 11 for stirring. The movement of the system on the guide rails 7 and the lifting of the lifting shaft 11 are controlled by the PLC automatic control system in the control system 3.
The mobile sampling monitoring system 6 includes a lift shaft 11 and a sampler 13. The sampler 13 is a hollow stainless steel rod, and is inserted into soil through the lifting shaft 11 for sampling. The soil sample can be taken down from the hollow sampler. The movement of the system on the guide rails 7 and the lifting of the lifting shaft 11 are controlled by a PLC automatic control system in the control system 3.
Example 1
Taking the engine oil contaminated soil, sieving the engine oil contaminated soil by a 20-mesh sieve, adding the engine oil contaminated soil into a bioreactor, spraying a soil additive to adjust the physical and chemical properties of the soil, and adjusting the water content of the soil to be 30-35% and the pH of the soil to be 6-8. The ratio of carbon to nitrogen to phosphorus is adjusted to 100: 5: 1 according to the concentration of organic carbon, quick-acting nitrogen and quick-acting phosphorus in the soil, wherein nitrogen is provided by sodium nitrate and ammonium sulfate, and phosphorus is provided by dipotassium phosphate.
Uniformly spraying the activated petroleum degrading microbial inoculum into the polluted soil, uniformly stirring, and respectively applying sinusoidal alternating current to two pairs of sheet DSA electrodes in the bioreactor, wherein the frequency of an electric field is 50Hz, and the peak voltage intensity is 100V/m. Two weeks after the electric field was applied, a sample was taken and the contaminant degradation rate was found to be 29.8%.
Example 2
Taking gasoline contaminated soil, sieving with a 20-mesh sieve, adding into a bioreactor, spraying a soil additive to adjust the physical and chemical properties of the soil, adjusting the water content of the soil to be 30-35%, and adjusting the pH of the soil to be 6-8. The ratio of carbon to nitrogen to phosphorus is adjusted to 100: 10: 1 according to the concentration of organic carbon, quick-acting nitrogen and quick-acting phosphorus in the soil, wherein nitrogen is provided by sodium nitrate and ammonium sulfate, and phosphorus is provided by dipotassium phosphate.
Uniformly spraying the activated petroleum degrading microbial inoculum into the polluted soil, uniformly stirring, and respectively applying sinusoidal alternating current to two pairs of sheet DSA electrodes in the bioreactor, wherein the frequency of an electric field is 50Hz, and the peak voltage intensity is 50V/m. Two weeks after the electric field was applied, samples were taken and the contaminant degradation rate was found to be 31.6%.
The following are experimental results without applying an alternating electric field in the bioreactor:
comparative example 1
Taking the engine oil contaminated soil, sieving the engine oil contaminated soil by a 20-mesh sieve, adding the engine oil contaminated soil into a bioreactor, spraying a soil additive to adjust the physical and chemical properties of the soil, and adjusting the water content of the soil to be 30-35% and the pH of the soil to be 6-8. The ratio of carbon to nitrogen to phosphorus is adjusted to 100: 5: 1 according to the concentration of organic carbon, quick-acting nitrogen and quick-acting phosphorus in the soil, wherein nitrogen is provided by sodium nitrate and ammonium sulfate, and phosphorus is provided by dipotassium phosphate.
And uniformly spraying the activated petroleum degrading microbial inoculum into the polluted soil, and starting to restore after uniformly stirring. Two weeks after remediation, a sample was taken to determine a 12.8% degradation rate of the contaminant.
Comparative example 2
Taking gasoline contaminated soil, sieving with a 20-mesh sieve, adding into a bioreactor, spraying a soil additive to adjust the physical and chemical properties of the soil, adjusting the water content of the soil to be 30-35%, and adjusting the pH of the soil to be 6-8. The ratio of carbon to nitrogen to phosphorus is adjusted to 100: 5: 1 according to the concentration of organic carbon, quick-acting nitrogen and quick-acting phosphorus in the soil, wherein nitrogen is provided by sodium nitrate and ammonium sulfate, and phosphorus is provided by dipotassium phosphate.
And uniformly spraying the activated petroleum degrading microbial inoculum into the polluted soil, and starting to restore after uniformly stirring. Two weeks after remediation, a sample was taken to determine a 14.5% degradation rate of the contaminant.
Through contrast pollutant degradation degree effect, the utility model discloses utilize two-dimentional alternating current electric field to strengthen the oil degradation microbial inoculum and restore, utilize the induced electric effect and the electrochemistry oxidation that produces of alternating current electric field to strengthen the degradation effect of oil degradation microbial inoculum to petroleum organic matter class organic matter promptly. The electric effect induced by the two-dimensional alternating current field can promote small-scale reciprocating movement of substances in soil in a two-dimensional plane, contact and mass transfer between nutrient substances, pollutants and the petroleum degradation microbial inoculum are strengthened, the electrochemical oxidation reaction generated on the surface of the electrode can be cooperated with the petroleum degradation microbial inoculum to degrade petroleum organic matters, the degradation effect of the petroleum degradation microbial inoculum on the petroleum organic matters is finally improved, and the repair efficiency is improved.
Claims (3)
1. The utility model provides a device of petroleum type organic matter contaminated soil is restoreed to two-dimentional alternating current electric field reinforcing microorganism which characterized in that: comprises a bioreactor (1), a sealing cover (2) with a hole, a control system (3), a spraying system (4), a movable stirring system (5), a movable sampling monitoring system (6) and a guide rail (7);
the bioreactor (1) is arranged in the middle of the guide rail (7), the bioreactor (1) is square, the interior of the bioreactor (1) is used as a reaction area, and two pairs of sheet DSA electrodes (8) are arranged on the four inner walls of the bioreactor (1);
the sealing cover (2) with the holes is arranged at the top of the bioreactor (1), and a plurality of round holes are formed in the sealing cover (2) with the holes;
the control system (3) comprises an alternating current power supply and a PLC automatic control system, wherein the alternating current power supply is used for applying sinusoidal alternating current to the two pairs of sheet DSA electrodes (8), and the PLC automatic control system is used for controlling the spraying system (4), the movable stirring system (5) and the movable sampling monitoring system (6);
the spraying system (4) consists of a storage tank (9) and a spraying pipeline (10), one end of the spraying pipeline (10) is connected with the storage tank (9), and the other end of the spraying pipeline (10) penetrates through a round hole in the sealing cover (2) with the hole and extends into the bioreactor (1);
the movable stirring system (5) is arranged at one end of the guide rail (7); comprises a first lifting shaft and a plurality of stirring rollers (12) connected on the first lifting shaft;
the movable sampling monitoring system (6) is arranged at the other end of the guide rail (7); comprises a second lifting shaft and a plurality of samplers (13) connected to the second lifting shaft.
2. The device for the enhanced microbial remediation of petroleum-like organic matter contaminated soil by the two-dimensional alternating current electric field according to claim 1, wherein the movement of the movable stirring system (5) on the guide rail (7) and the lifting of the first lifting shaft are controlled by a PLC automatic control system in the control system (3); the stirring roller (12) is a solid stainless steel bar.
3. The device for the enhanced microbial remediation of petroleum-like organic matter contaminated soil by the two-dimensional alternating current electric field according to claim 1, wherein the movement of the movable sampling monitoring system (6) on the guide rail (7) and the lifting of the second lifting shaft are controlled by a PLC automatic control system in the control system (3); the sampler (13) is a hollow stainless steel rod.
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| CN201920732115.8U CN210411897U (en) | 2019-05-21 | 2019-05-21 | Device for reinforcing microbial remediation of petroleum organic matter contaminated soil by two-dimensional alternating current electric field |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110193512A (en) * | 2019-05-21 | 2019-09-03 | 中电建路桥集团有限公司 | The device and method that two-dimentional AC field enhancement microbiological repairs petroleum-type organic material contaminated soil |
| CN113231460A (en) * | 2021-05-31 | 2021-08-10 | 中南林业科技大学 | Three-dimensional electric restoration device and method for polluted soil |
-
2019
- 2019-05-21 CN CN201920732115.8U patent/CN210411897U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110193512A (en) * | 2019-05-21 | 2019-09-03 | 中电建路桥集团有限公司 | The device and method that two-dimentional AC field enhancement microbiological repairs petroleum-type organic material contaminated soil |
| CN110193512B (en) * | 2019-05-21 | 2024-06-18 | 中电建路桥集团有限公司 | Device and method for repairing petroleum organic matter contaminated soil by two-dimensional alternating current electric field reinforced microorganisms |
| CN113231460A (en) * | 2021-05-31 | 2021-08-10 | 中南林业科技大学 | Three-dimensional electric restoration device and method for polluted soil |
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