CN114192558A - Petroleum soil pollution remediation process for promoting crude oil degradation - Google Patents
Petroleum soil pollution remediation process for promoting crude oil degradation Download PDFInfo
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Abstract
The invention discloses a petroleum soil pollution remediation process for promoting crude oil degradation, and relates to the technical field of soil remediation. According to the petroleum soil pollution remediation process, the sampling detection is carried out after the areas are divided, the soil with different depths in different areas can be drilled at the same time for the detection of the petroleum hydrocarbon content, the application of the remediation agent and the degrading bacteria liquid is convenient to carry out adaptively, and the unreasonable use amount of the remediation agent and the degrading bacteria liquid is avoided; the negative pressure extraction purification can adsorb, filter and purify volatile gas and oil-water mixture in the soil; and the degradation of the degradation bacterial liquid and the soil restoration agent restoration process adjusts the addition amount of the degradation bacterial liquid and the soil restoration agent according to the petroleum hydrocarbon content of the soil with different depths in different areas. The petroleum soil pollution remediation process can realize targeted remediation treatment of soils with different depths in different areas, achieves the effect of effectively degrading petroleum hydrocarbon in crude oil for a long time, and saves remediation cost.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a petroleum soil pollution remediation process for promoting crude oil degradation.
Background
The remediation of petroleum-polluted soil is a worldwide problem, and the main difficulties are as follows: 1. the soil system is used as a final carrier of the petroleum pollutants, and substances in the system are not uniformly distributed and have poor controllability; 2. petroleum products have complex components and are not beneficial to bioremediation of a single strain; 3. the biodegradability of petroleum products varies with the type and size of its components; 4. the heavy content is high, the bioremediation speed is low, and the toxicity is strong after the bioremediation; 5. pollutants form dynamic phase equilibrium and chemical equilibrium in the local part of the system; 6. the toxic and harmful pollutants change the normal life behavior of the soil-biological system; 7. the hydrophobicity of petroleum-based contaminants reduces the biological reactivity.
The existing technology for restoring the petroleum-polluted soil comprises physical restoration, chemical restoration, biological restoration and phytorestoration, wherein the physical restoration and the chemical restoration easily cause secondary pollution in the process of restoring the petroleum-polluted soil, so that the application of the petroleum-polluted soil is limited, and the bioremediation and the phytorestoration have limited restoration capability on the petroleum-polluted soil, so that the petroleum pollutants in the soil are difficult to completely eliminate. The invention patent of publication number CN109365495A discloses a method for restoring petroleum-polluted soil by coupling a biological carbon-loaded surfactant with a microbial plant, which comprises the following steps: s1, applying the biochar-loaded surface activity to the surface layer of the petroleum-polluted soil, and standing and aging for 80 days; s2, after the soil is aged, sprinkling water on the surface soil to enable the water content to reach 50-60%, adjusting the pH value of the soil to 7-8, and then adding a petroleum degrading microbial inoculum into the soil for fermentation; s3, planting plants in different quantity proportions in the soil after the soil fermentation is finished, and removing the whole plants after the plants are mature; s4, repeating S1-S3 until the content of the petroleum pollutant in the petroleum pollutant soil is detected to be less than or equal to 4.5 g/kg. The invention adopts the in-situ repair technology, does not damage the environment in the repair process and does not bring secondary pollution. The following technical problems are found to exist: the method cannot be used for repairing and treating the soil at different depths in different areas, cannot achieve the effect of effectively degrading petroleum hydrocarbon in the crude oil for a long time, and increases the repairing cost.
Disclosure of Invention
The invention aims to provide a petroleum soil pollution remediation process for promoting crude oil degradation, which is used for solving the technical problems that in the prior art, soil remediation treatment of different depths in different areas cannot be realized, the effect of effectively degrading petroleum hydrocarbon in crude oil for a long time cannot be achieved, and the remediation cost is increased.
The purpose of the invention can be realized by the following technical scheme:
the petroleum soil pollution remediation process for promoting crude oil degradation comprises the following steps:
area division: uniformly dividing polluted petroleum soil into a plurality of areas to form a plurality of gridding soil areas;
sampling and detecting: taking out the soil corresponding to different areas with different depths from a plurality of sampling holes through a petroleum soil sampling device, and detecting the content of petroleum hydrocarbon through a soil petroleum hydrocarbon detector;
negative pressure extraction and purification: the method comprises the steps that a vacuum pump in a petroleum soil pollution remediation system for promoting crude oil degradation is used for vacuumizing a communicating pipe, a pipe pile and an extraction liquid feeding pipe, volatile gas and oil-water mixtures in soils with different depths in different areas are adsorbed and removed through a vacuum liquid feeding port, the volatile gas and the oil-water mixtures enter a purification filter and are filtered through a quartz sand filter screen, an active carbon filter screen and a glass fiber filter screen in three steps to obtain pure oil-water mixtures and clean gas, the oil-water mixtures enter a liquid storage tank, and the clean gas is discharged through an exhaust pipe;
degrading the degrading bacterial liquid: opening a second one-way valve and a first booster pump, enabling the degradation bacterial liquid in the degradation bacterial liquid storage tank to enter a communicating pipe through a first feeding pipe under the boosting action of the first booster pump, and enabling the degradation bacterial liquid to enter the soil with different depths in different areas through each pipe pile, an extraction liquid feeding pipe and a vacuum liquid feeding port to degrade pollutants in the petroleum soil;
repairing soil repairing agent: and closing the first booster pump, opening the second booster pump, enabling the soil remediation agent in the remediation agent storage tank to enter the communicating pipe through the second feeding pipe under the boosting action of the second booster pump, and enabling each pipe pile, the extraction liquid feeding pipe and the vacuum liquid feeding port to enter the soil with different depths in different areas to remediate the petroleum soil.
Furthermore, the length and the width of each gridding soil area are 3-5 m, and the depth is 0.6-1.5 m.
Further, the sampling detection comprises the following specific processes: the driving gear is driven by the driving motor to rotate, the driving gear drives the drill rod to rotate and ascend and descend, the driven gear assists in rotating and supporting, stable rotation and ascending and descending of the drill rod are kept, soil with different depths in different areas enters the sampling cavity, and soil with different depths in corresponding different areas is taken out from the plurality of sampling holes to be subjected to petroleum hydrocarbon content detection.
Further, the preparation method of the degrading bacterial liquid comprises the following steps: mixing diatomite, disodium lauryl sulfosuccinate and coconut monoethanolamide according to a mass ratio of (3-5): (1.2-1.6): (0.5-0.8) uniformly mixing, and sieving with a 200-300-mesh sieve to obtain an active dispersant; adding a petroleum degrading microbial inoculum with 0.3-0.5% of active dispersant, and uniformly mixing to obtain a degrading bacterial liquid.
Further, the petroleum degrading microbial inoculum is prepared from BDB-n biodegradable bacterium fermentation liquor, BDB-a biodegradable bacterium fermentation liquor and bacillus subtilis fermentation liquor according to the mass ratio of 1: 1.1-1.3: 0.8 to 1.2, and the effective viable count of the petroleum degrading bacteria agent is 7 multiplied by 108～8×108one/mL.
Further, the soil remediation agent is prepared by mixing the following components in parts by weight: 35-50 parts of calcium bentonite, 12-25 parts of calcium carbonate, 6-15 parts of gypsum powder, 3-8 parts of ferric oxide, 5-12 parts of biomass carbon, 2-7 parts of potassium humate, 0.5-2 parts of bacillus subtilis, 1-3 parts of chelating agent and 65-90 parts of purified water.
Further, promote petroleum soil pollution repair system of crude oil degradation including locate limiting plate and cavity in and vertically stretch into many tubular piles of latticed soil region inside, the bottom of tubular pile extends to the bottom in latticed soil region, the limiting plate is extended at the top of tubular pile, the tubular pile is located the extraction liquid feeding pipe that the regional in intercommunication of latticed soil has many levels to extend, the junction of extracting liquid feeding pipe and tubular pile all is equipped with the solenoid valve, is equipped with a plurality of vacuum filling openings on the route of extracting the liquid feeding pipe.
Furthermore, the top of each tubular pile is connected with a flange two-way valve, a communicating pipe is connected between the adjacent flange two-way valves, the flange two-way valve on one side is connected with a first one-way valve, and the flange two-way valve on the other side is connected with a second one-way valve; first check valve has the vacuum pump through the tube coupling, and the vacuum pump has the purification filter through the tube coupling, and the discharge gate of purification filter is connected with liquid storage tank, and liquid storage tank's top is equipped with the blast pipe.
Further, the second one-way valve is communicated with the discharge end of the first booster pump through a first feeding pipe, and the feed end of the first booster pump is communicated with the degraded bacterial liquid storage tank; the second one-way valve is communicated with the discharge end of the second booster pump through a second feeding pipe, and the feed end of the second booster pump is communicated with the repairing agent storage tank.
The invention has the following beneficial effects:
1. according to the petroleum soil pollution remediation process, the sampling detection is carried out after the areas are divided, the soil with different depths in different areas can be drilled at the same time for the detection of the petroleum hydrocarbon content, the application of the remediation agent and the degrading bacteria liquid is convenient to carry out adaptively, and the unreasonable use amount of the remediation agent and the degrading bacteria liquid is avoided; the negative pressure extraction purification can adsorb, filter and purify volatile gas and oil-water mixture in the soil; and the degradation of the degradation bacterial liquid and the soil restoration agent restoration process adjusts the addition amount of the degradation bacterial liquid and the soil restoration agent according to the petroleum hydrocarbon content of the soil with different depths in different areas. The petroleum soil pollution remediation process can realize targeted remediation treatment of soils with different depths in different areas, achieves the effect of effectively degrading petroleum hydrocarbon in crude oil for a long time, and saves remediation cost.
2. After the degrading bacterial liquid is applied to the petroleum soil, the diatomite and the petroleum degrading bacterial agent are well dispersed and permeated due to the foaming emulsification effect of the surfactant, the adsorption and degradation effects of the bacterial on petroleum hydrocarbon and microorganisms in the petroleum soil are exerted, the adsorption and degradation efficiency is high, and the soil structure is improved.
3. The soil repairing agent is rich in nutrition, contains nutrient elements such as calcium ions, iron ions, potassium ions and the like, can increase the soil nutrition after being applied to petroleum soil, is beneficial to the survival of strains and plays a role in long-term adsorption and degradation, and achieves the effect of effectively degrading petroleum hydrocarbon in crude oil for a long time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a process for remediating petroleum-based soil contamination to promote crude oil degradation in an embodiment of the present disclosure;
FIG. 2 is a cross-sectional view of a petroleum-based soil sampling device after construction in an embodiment of the present invention;
FIG. 3 is a top view of a petroleum based soil sampling device after construction in an embodiment of the present invention;
FIG. 4 is a schematic view of an assembly structure of the sampling mechanism, the mounting cylinder and the limiting plate according to the embodiment of the present invention;
FIG. 5 is a cross-sectional view of a petroleum-based soil pollution remediation system that promotes crude oil degradation according to an embodiment of the present disclosure after construction;
FIG. 6 is a schematic view of an assembly structure of the extraction charging pipe and the solenoid valve in the embodiment of the present invention.
Reference numerals: 10. gridding the soil area; 11. a drill stem; 12. a limiting block; 13. a drill bit; 14. a sampling cavity; 15. a sampling hole; 20. a support pillar; 21. mounting a plate; 22. mounting the cylinder; 23. a cavity; 24. a limiting plate; 25. a counterweight pile; 26. a driving gear; 27. a driven gear; 30. a tubular pile; 31. extracting a liquid adding pipe; 32. an electromagnetic valve; 33. a vacuum liquid feeding port; 34. a flange two-way valve; 35. a communicating pipe; 36. a first check valve; 37. a second one-way valve; 38. a vacuum pump; 39. a purifying filter; 40. a liquid storage tank; 41. an exhaust pipe; 42. a first feed pipe; 43. a first booster pump; 44. a storage tank for degraded bacteria liquid; 45. a second feed tube; 46. a second booster pump; 47. a repairing agent storage tank; 48. a quartz sand filter screen; 49. an active carbon filter screen; 50. a glass fiber filter screen.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 2-4, this embodiment provides a petroleum soil sampling device, including locating a plurality of support columns 20 in latticed soil region 10 both sides, be connected with between the support column 20 of both sides and span a plurality of mounting panels 21 in latticed soil region 10 top, be equipped with the installation section of thick bamboo 22 that corresponds with every latticed soil region 10 on a plurality of mounting panels 21, be equipped with cavity 23 in the installation section of thick bamboo 22, the top of installation section of thick bamboo 22 is equipped with vertical limiting plate 24, be equipped with in limiting plate 24 and the cavity 23 and can vertically stretch into the inside sampling mechanism in latticed soil region 10, the bottom of support column 20 is equipped with the counter weight stake 25 that stretches into latticed soil region 10.
The sampling mechanism comprises a drill rod 11, a limiting block 12 which is arranged in a sliding mode with an inner cavity of a limiting plate 24 is arranged at the top of the drill rod 11, a drill bit 13 is arranged at the end of the drill rod 11, a sampling cavity 14 is arranged inside the drill rod, and a plurality of sampling holes 15 are formed in two sides of the sampling cavity 14. The periphery of the drill rod 11 is provided with external threads, and a driving gear 26 and a driven gear 27 which are meshed with the external threads of the drill rod 11 are arranged in the cavity 23.
This petroleum type soil sampling device, be divided into the petroleum type soil of a plurality of latticed soil region 10, through a plurality of support columns 20, mounting panel 21, limiting plate 24, counter weight stake 25 and installation section of thick bamboo 22 form foundation structure, after boring into the petroleum type soil that needs take a sample with a plurality of drilling rods 11, the soil of the different degree of depth of different regions gets into in the sample chamber 14, drive arrangement for example driving motor drive driving gear 26 rotates, the rotatory lift of driving gear 26 drive drilling rod 11, driven gear 27 plays the effect of supplementary rotatory support, keep the stable rotatory lift of drilling rod 11.
After the soil corresponding to different areas with different depths is taken out from the plurality of sampling holes 15, the content of the petroleum hydrocarbon is detected by the soil petroleum hydrocarbon detector, so that the amount of the repairing agent and the degrading bacteria required by the soil with different areas with different depths can be conveniently measured and calculated according to the content of the petroleum hydrocarbon. The soil petroleum hydrocarbon detector is preferably a portable soil total petroleum hydrocarbon rapid detector of DEXSILpetroFLAG, and the detection range is 15-2000 ppm. The petroleum soil sampling device of the embodiment can drill different depths of soil in different areas simultaneously to detect the content of petroleum hydrocarbon, is convenient for adaptively apply the repairing agent and the degrading bacteria liquid, and avoids unreasonable use amount of the repairing agent and the degrading bacteria liquid.
Example 2
As shown in fig. 5-6, the present embodiment provides a petroleum soil pollution remediation system for promoting crude oil degradation, including locating in limiting plate 24 and cavity 23 and vertically stretching into many tubular piles 30 inside latticed soil region 10, the bottom of tubular pile 30 extends to the bottom of latticed soil region 10, limiting plate 24 extends from the top of tubular pile 30, tubular pile 30 is located latticed soil region 10 and is connected with many horizontally extending extraction liquid feeding pipes 31, electromagnetic valves 32 are provided at the joints of extraction liquid feeding pipes 31 and tubular piles 30, and a plurality of vacuum liquid feeding ports 33 are provided on the path of extraction liquid feeding pipe 31.
The top of each tubular pile 30 is connected with a flange two-way valve 34, a communication pipe 35 is connected between adjacent flange two-way valves 34, the flange two-way valve 34 on one side is connected with a first one-way valve 36, and the flange two-way valve 34 on the other side is connected with a second one-way valve 37. The first one-way valve 36 is connected with a vacuum pump 38 through a pipeline, the vacuum pump 38 is connected with a purification filter 39 through a pipeline, a discharge hole of the purification filter 39 is connected with a liquid storage tank 40, and an exhaust pipe 41 is arranged at the top of the liquid storage tank 40. The second one-way valve 37 is communicated with the discharge end of the first booster pump 43 through a first feeding pipe 42, and the feed end of the first booster pump 43 is communicated with the degraded bacterium liquid storage tank 44. The second check valve 37 is communicated with the discharge end of the second booster pump 46 through a second feeding pipe 45, and the feed end of the second booster pump 46 is communicated with a repairing agent storage tank 47. Wherein, the inner cavity of the purifying filter 39 is provided with a quartz sand filter screen 48, an active carbon filter screen 49 and a glass fiber filter screen 50 from top to bottom in sequence.
This embodiment promotes crude oil degradation's petroleum soil pollution repair system, support column 20 at sampling device, mounting panel 21, limiting plate 24, on counter weight stake 25 and the installation section of thick bamboo 22 foundation structure, set up the vertical many tubular piles 30 that stretch into latticed soil region 10 inside, many of the connection on the tubular pile 30 extract the liquid feeding pipe 31, through extracting the vacuum filling opening 33 on the liquid feeding pipe 31, can enough realize the vacuum extraction to the volatile gas of the different regional different degree of depth soil and oil-water mixture, also can carry out the transport of degradation fungus liquid and soil remediation agent to the soil of the different regional different degree of depth.
The vacuum pump 38 is matched with a purification filter 39 and a liquid storage tank 40, after the first one-way valve 36 and the vacuum pump 38 are opened, the vacuum pump 38 extracts vacuum through the communicating pipe 35, the tubular pile 30 and the extraction liquid feeding pipe 31, volatile gas and oil-water mixture in soil with different depths in different areas are adsorbed and removed through the vacuum liquid feeding port 33, the volatile gas and the oil-water mixture enter the purification filter 39 and are filtered through a quartz sand filter screen 48, an active carbon filter screen 49 and a glass fiber filter screen 50, suspended matters, organic matters, colloid particles, microorganisms and partial heavy metal ions are effectively intercepted and removed by quartz sand, the active carbon is used for filtering, decoloring and deodorizing, the organic matters, the heavy metals, bacteria, viruses and radioactive substances are removed, the particles and the microorganisms are removed through glass fiber filtering, pure oil-water mixture and clean gas are obtained, the oil-water mixture enters the liquid storage tank 40, the clean gas is exhausted through the exhaust pipe 41.
When the vacuum pump 38 and the first one-way valve 36 are closed, and the second one-way valve 37 and the first booster pump 43 are opened, the degraded bacteria liquid in the degraded bacteria liquid storage tank 44 enters the communicating pipe 35 through the first booster pump 43 and the first feeding pipe 42, and then enters the soil with different depths in different areas through each tubular pile 30, the extraction liquid feeding pipe 31 and the vacuum liquid feeding port 33; when the first booster pump 43 is closed and the second booster pump 46 is opened, the soil remediation agent in the remediation agent storage tank 47 enters the communicating pipe 35 through the second booster pump 46 and the second feeding pipe 45 and then enters the soil at different depths in different areas through each pipe pile 30, the extraction liquid feeding pipe 31 and the vacuum liquid feeding port 33, the electromagnetic valve 32 intelligently controls the on-off of the extraction liquid feeding pipe 31, and the addition amounts of the degradation bacterium liquid and the soil remediation agent are adjusted according to the petroleum hydrocarbon content of the soil at different depths in different areas. This petroleum soil pollution repair system can realize adsorbing, purifying and filtering to volatile gas and oil-water mixture in the different degree of depth soil of different regions to and the controllable interpolation of degradation bacterial liquid and soil remediation agent, satisfy the pollution restoration in different petroleum hydrocarbon content soil horizon.
Example 3
As shown in fig. 1 to 6, this embodiment provides a petroleum soil pollution remediation process for promoting crude oil degradation, including the following steps:
area division: uniformly dividing polluted petroleum soil into a plurality of areas to form a plurality of gridding soil areas 10; the length and the width of each gridding soil area 10 are 3-5 m, and the depth is 0.6-1.5 m.
Sampling and detecting: through petroleum soil sampling device, take out the soil that corresponds the different regional different degree of depth from a plurality of sampling holes 15 departments, carry out the detection of petroleum hydrocarbon content through soil petroleum hydrocarbon detector. Specifically, driving motor drive driving gear 26 rotates, and driving gear 26 drive drilling rod 11 rotatory lift, and driven gear 27 auxiliary rotation supports, keeps the steady rotatory lift of drilling rod 11, and the soil of the different degree of depth of different regions gets into sample chamber 14 in, takes out the soil that corresponds the different degree of depth of different regions from a plurality of sampling holes 15 and carries out petroleum hydrocarbon content testing.
Negative pressure extraction and purification: vacuum is pumped to the communicating pipe 35, the tubular pile 30 and the extraction liquid feeding pipe 31 through a vacuum pump 38 in the petroleum soil pollution remediation system for promoting crude oil degradation, volatile gas and oil-water mixture in soil with different depths in different areas are adsorbed and removed through a vacuum liquid feeding port 33, the volatile gas and the oil-water mixture enter a purification filter 39 and are filtered through a quartz sand filter screen 48, an active carbon filter screen 49 and a glass fiber filter screen 50 in three steps to obtain pure oil-water mixture and clean gas, the oil-water mixture enters a liquid storage tank 40, and the clean gas is discharged through an exhaust pipe 41;
degrading the degrading bacterial liquid: the second one-way valve 37 and the first booster pump 43 are opened, the degraded bacteria liquid in the degraded bacteria liquid storage tank 44 enters the communicating pipe 35 through the first feeding pipe 42 under the boosting action of the first booster pump 43, and then enters the soil with different depths in different areas through each tubular pile 30, the extraction liquid feeding pipe 31 and the vacuum liquid feeding port 33 to degrade the pollutants in the petroleum soil;
the preparation method of the degrading bacterial liquid comprises the following steps: mixing diatomite, disodium lauryl sulfosuccinate and coconut monoethanolamide according to a mass ratio of 3.6: 1.4: 0.6, uniformly mixing, and sieving with a 200-300-mesh sieve to obtain an active dispersant; adding a petroleum degrading bacterial agent with 0.4% of active dispersant, and uniformly mixing to obtain a degrading bacterial liquid. The petroleum degrading microbial inoculum is prepared from BDB-n biodegradable bacterium fermentation liquor, BDB-a biodegradable bacterium fermentation liquor and bacillus subtilis fermentation liquor according to the mass ratio of 1: 1.2: 0.9, the effective viable count in the petroleum degrading bacteria agent is 7 multiplied by 108～8×108one/mL. BDB-n biodegradable bacteria, BDB-a biodegradable bacteria and bacillus subtilis are all purchased commercial strains, are not related to the development of new strains, and are only related to the application of the existing strains. The application amount of the degrading bacteria liquid is based on the petroleum hydrocarbon content of the soil with different depths in different areas, theoretically, the petroleum hydrocarbon content is higher, the application amount of the degrading bacteria liquid is higher, the application amounts with different depths in different areas are controlled through the electromagnetic valve 32, and the accurate amount is based on the actual pollution repairing process.
In the degrading bacterial liquid, the diatomite has the characteristics of fineness, light weight, strong water absorption and permeability and the like, has large specific surface area and low volume weight, and can absorb water 2.5 times heavier than the diatomite; disodium lauryl sulfosuccinate and coconut monoethanolamide are used as surfactants with good irritation and excellent biodegradation performance, and the diatomite can well perform compatible adsorption on the disodium lauryl sulfosuccinate and the coconut monoethanolamide and can well disperse and dilute the petroleum degradation microbial inoculum; after the degrading bacterial liquid is applied to the petroleum soil, the diatomite and the petroleum degrading bacterial agent are well dispersed and permeated due to the foaming emulsification effect of the surfactant, the adsorption and degradation effects of the bacterial on petroleum hydrocarbon and microorganisms in the petroleum soil are exerted, the adsorption and degradation efficiency is high, and the soil structure is improved.
Repairing soil repairing agent: the first booster pump 43 is closed, the second booster pump 46 is opened, the soil remediation agent in the remediation agent storage tank 47 enters the communicating pipe 35 through the second feeding pipe 45 under the boosting action of the second booster pump 46, and then enters the soil with different depths in different areas through each pipe pile 30, the extraction liquid feeding pipe 31 and the vacuum liquid feeding port 33 to remediate the petroleum soil. The application amount of the soil remediation agent is based on the petroleum hydrocarbon content of the soil with different depths in different areas, theoretically, the higher the petroleum hydrocarbon content is, the higher the application amount of the degrading bacteria liquid is, the application amount with different depths in different areas is controlled through the electromagnetic valve 32, and the accurate application amount is based on the actual pollution remediation process.
Wherein the soil remediation agent is prepared by mixing the following components in parts by weight: 46 parts of calcium bentonite, 18 parts of calcium carbonate, 13 parts of gypsum powder, 6 parts of ferric oxide, 7 parts of biomass carbon, 6 parts of potassium humate, 0.8 part of bacillus subtilis, 1.5 parts of chelating agent EDTA-2Na and 88 parts of purified water. The soil repairing agent is rich in nutrition, contains nutrient elements such as calcium ions, iron ions, potassium ions and the like, can increase the soil nutrition after being applied to petroleum soil, is beneficial to the survival of strains and plays a role in long-term adsorption and degradation, and achieves the effect of effectively degrading petroleum hydrocarbon in crude oil for a long time.
After the repairing is finished, sampling detection is carried out on each gridding soil area 10, and the average removal rate of pollutants reaches 96.7%.
Example 4
The difference between this example and example 3 is that the preparation method of the degrading bacteria liquid is as follows: mixing diatomite, disodium lauryl sulfosuccinate and coconut monoethanolamide according to a mass ratio of 4.3: 1.5: 0.65, uniformly mixing, and sieving with a 200-300-mesh sieve to obtain an active dispersant; adding a petroleum degrading bacterial agent with 0.38% of active dispersant, and uniformly mixing to obtain a degrading bacterial liquid. The petroleum degrading microbial inoculum is prepared from BDB-n biodegradable bacterium fermentation liquor, BDB-a biodegradable bacterium fermentation liquor and bacillus subtilis fermentation liquor according to the mass ratio of 1: 1.25: 1.1 mixing.
The soil remediation agent is prepared by mixing the following components in parts by weight: 47 parts of calcium bentonite, 22 parts of calcium carbonate, 10 parts of gypsum powder, 7 parts of ferric oxide, 9 parts of biomass carbon, 6 parts of potassium humate, 1.6 parts of bacillus subtilis, 2.3 parts of chelating agent EGTA and 85 parts of purified water.
After the remediation is finished, sampling detection is carried out on each gridding soil area 10, and the average removal rate of pollutants reaches 95.9%.
Example 5
The difference between this example and example 3 is that the preparation method of the degrading bacteria liquid is as follows: mixing diatomite, disodium lauryl sulfosuccinate and coconut monoethanolamide according to a mass ratio of 4.6: 1.6: 0.7, uniformly mixing, and sieving with a 200-300-mesh sieve to obtain an active dispersant; adding a petroleum degrading bacterial agent with 0.42% of active dispersant, and uniformly mixing to obtain a degrading bacterial liquid. The petroleum degrading microbial inoculum is prepared from BDB-n biodegradable bacterium fermentation liquor, BDB-a biodegradable bacterium fermentation liquor and bacillus subtilis fermentation liquor according to the mass ratio of 1: 1.25: 0.96 and mixing.
The soil remediation agent is prepared by mixing the following components in parts by weight: 42 parts of calcium bentonite, 18 parts of calcium carbonate, 12 parts of gypsum powder, 7 parts of ferric oxide, 11 parts of biomass charcoal, 6 parts of potassium humate, 1.6 parts of bacillus subtilis, 2.5 parts of chelating agent HEDTA and 76 parts of purified water.
After the repairing is finished, sampling detection is carried out on each gridding soil area 10, and the average removal rate of pollutants reaches 96.3%.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. The petroleum soil pollution remediation process for promoting crude oil degradation is characterized by comprising the following steps:
area division: uniformly dividing polluted petroleum soil into a plurality of areas to form a plurality of gridding soil areas (10);
sampling and detecting: the soil corresponding to different areas with different depths is taken out from a plurality of sampling holes (15) through a petroleum soil sampling device, and the content of petroleum hydrocarbon is detected through a soil petroleum hydrocarbon detector;
negative pressure extraction and purification: the vacuum pump (38) in the petroleum soil pollution remediation system for promoting crude oil degradation is used for vacuumizing the communicating pipe (35), the tubular pile (30) and the extraction liquid adding pipe (31), volatile gas and oil-water mixture in soil with different depths in different areas are adsorbed and removed through the vacuum liquid adding port (33), the volatile gas and the oil-water mixture enter the purification filter (39), and are filtered through the quartz sand filter screen (48), the activated carbon filter screen (49) and the glass fiber filter screen (50) in three steps to obtain pure oil-water mixture and clean gas, the oil-water mixture enters the liquid storage tank (40), and the clean gas is discharged through the exhaust pipe (41);
degrading the degrading bacterial liquid: the second one-way valve (37) and the first booster pump (43) are opened, the degradation bacterial liquid in the degradation bacterial liquid storage tank (44) enters the communicating pipe (35) through the first feeding pipe (42) under the boosting action of the first booster pump (43), and then enters the soil with different depths in different areas through each pipe pile (30), the extraction liquid feeding pipe (31) and the vacuum liquid feeding port (33) to degrade pollutants in the petroleum soil;
repairing soil repairing agent: the first booster pump (43) is closed, the second booster pump (46) is opened, the soil repairing agent in the repairing agent storage tank (47) enters the communicating pipe (35) through the boosting effect of the second booster pump (46) through the second feeding pipe (45), and then enters the soil with different depths in different areas through each pipe pile (30), the extraction liquid feeding pipe (31) and the vacuum liquid feeding port (33) to repair the petroleum soil.
2. A petroleum soil pollution remediation process for promoting crude oil degradation according to claim 1, wherein each meshed soil area (10) is 3 to 5m in length and width and 0.6 to 1.5m in depth.
3. A petroleum soil pollution remediation process for promoting crude oil degradation as claimed in claim 1, wherein the sampling and detection process comprises: the driving gear (26) is driven to rotate by the driving motor, the driving gear (26) drives the drill rod (11) to rotate and lift, the driven gear (27) assists in rotating and supporting, the drill rod (11) is kept to rotate and lift stably, the soil at different depths in different areas enters the sampling cavity (14), and the soil at different depths in corresponding different areas is taken out from a plurality of sampling holes (15) to detect the content of petroleum hydrocarbon.
4. The petroleum soil pollution remediation process for promoting crude oil degradation as claimed in claim 1, wherein the preparation method of the degrading bacteria liquid is as follows: mixing diatomite, disodium lauryl sulfosuccinate and coconut monoethanolamide according to a mass ratio of (3-5): (1.2-1.6): (0.5-0.8) uniformly mixing, and sieving with a 200-300-mesh sieve to obtain an active dispersant; adding a petroleum degrading microbial inoculum with 0.3-0.5% of active dispersant, and uniformly mixing to obtain a degrading bacterial liquid.
5. Petroleum based soil contamination remediation process of claim 4 that promotes crude oil degradationThe process is characterized in that the petroleum degrading microbial inoculum is prepared from BDB-n biodegradable bacteria fermentation liquor, BDB-a biodegradable bacteria fermentation liquor and bacillus subtilis fermentation liquor according to the mass ratio of 1: 1.1-1.3: 0.8 to 1.2, and the effective viable count of the petroleum degrading bacteria agent is 7 multiplied by 108～8×108one/mL.
6. The petroleum soil pollution remediation process for promoting crude oil degradation as claimed in claim 1, wherein the soil remediation agent is prepared by mixing the following components in parts by weight: 35-50 parts of calcium bentonite, 12-25 parts of calcium carbonate, 6-15 parts of gypsum powder, 3-8 parts of ferric oxide, 5-12 parts of biomass carbon, 2-7 parts of potassium humate, 0.5-2 parts of bacillus subtilis, 1-3 parts of chelating agent and 65-90 parts of purified water.
7. The petroleum soil pollution remediation process capable of promoting crude oil degradation according to claim 1, wherein the petroleum soil pollution remediation system capable of promoting crude oil degradation comprises a plurality of tubular piles (30) which are arranged in limiting plates (24) and cavities (23) and vertically extend into a gridded soil area (10), the bottom ends of the tubular piles (30) extend to the bottom of the gridded soil area (10), the limiting plates (24) extend out of the top portions of the tubular piles (30), the tubular piles (30) are located in the gridded soil area (10) and communicated with a plurality of horizontally extending extraction liquid feeding pipes (31), electromagnetic valves (32) are arranged at the joints of the extraction liquid feeding pipes (31) and the tubular piles (30), and a plurality of vacuum liquid feeding ports (33) are arranged on the paths of the extraction liquid feeding pipes (31).
8. A petroleum soil pollution remediation process for promoting crude oil degradation according to claim 7, wherein a flange two-way valve (34) is connected to the top of each pipe pile (30), a communication pipe (35) is connected between adjacent flange two-way valves (34), a first one-way valve (36) is connected to the flange two-way valve (34) on one side, and a second one-way valve (37) is connected to the flange two-way valve (34) on the other side; the first check valve (36) is connected with a vacuum pump (38) through a pipeline, the vacuum pump (38) is connected with a purification filter (39) through a pipeline, a discharge hole of the purification filter (39) is connected with a liquid storage tank (40), and an exhaust pipe (41) is arranged at the top of the liquid storage tank (40).
9. A petroleum soil pollution remediation process for promoting crude oil degradation according to claim 8, wherein the second one-way valve (37) is communicated with a discharge end of the first booster pump (43) through the first feeding pipe (42), and a feed end of the first booster pump (43) is communicated with the degrading bacteria liquid storage tank (44); the second one-way valve (37) is communicated with the discharge end of the second booster pump (46) through a second feeding pipe (45), and the feed end of the second booster pump (46) is communicated with the repairing agent storage tank (47).
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Application publication date: 20220318 |