CN203664355U - Microbial remediation pile for remedying contaminated soil - Google Patents
Microbial remediation pile for remedying contaminated soil Download PDFInfo
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- CN203664355U CN203664355U CN201320724489.8U CN201320724489U CN203664355U CN 203664355 U CN203664355 U CN 203664355U CN 201320724489 U CN201320724489 U CN 201320724489U CN 203664355 U CN203664355 U CN 203664355U
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Abstract
The utility model discloses a microbial remediation pile for remedying contaminated soil. The pile is formed through combination of a stirring technology and a microbial remediation technology and used for performing remediationmanagement on a contaminated site, and a pile body comprises in-situ contaminated soil and a remediation liquid. Aconstruction process of the microbial remediation pile comprises the step as follows: a, site leveling, survey and setting out; b, stirring rig positioning, sinking, liquid injection and stirring; and c, lifting, liquid injection and stirring. The remediation liquid in the microbial remediation pile can promote growth of microorganisms, and themicroorganisms remedy the contaminated soil in the microbial remediation pile; meanwhile, the remediation liquid is diffused into contaminated soil around the microbial remediation pile to promote growth of microorganisms in the contaminated soil around the microbial remediation pile, so that the contaminated soil around the microbial remediation pile is remedied. The microbial remediation pile is used for performing microbial remediation on the low-permeability contaminated soil, problems that remediation depths are low and gases and nutrient substances in low-permeabilitysoil bodies are low in diffusion rate in the prior art can be solved, theremediation efficiency is improved, and in addition, the construction time is shortened.
Description
Technical field
The utility model belongs to environmental geotechnical technical field, relates to a kind of in order to repair the microorganism reparation stake of Polluted Soil.
Background technology
Polluted Soil reparation is divided into physics reparation, chemistry reparation and biological restoration by method, is divided into original position reparation and showering by embodiment.Microorganism is repaired and belongs to bioremediation technology field, is utilize the indigenous microorganism in soil or drop into the high-effective microorganism through domestication in Polluted Soil, by the process of inorganic pollution in organic pollution or the fixing soil body in the metabolic activity degraded soil body of bacterial strain.Under optimum conditions, microorganism can be by degradable poisonous and harmful organic pollution nontoxic byproduct---carbon dioxide, water, organic acid and the methane of becoming.The inorganic pollutions such as heavy metal although microorganism can not be degraded, can be used for changing heavy metal valence state, as severe toxicity and the strong Cr VI of mobility being transformed into the trivalent chromium of the slightly low and difficult movement of toxicity.
Microorganism is repaired and has the following advantages: 1) organic pollution thoroughly can be degraded into nonhazardous and obtain byproduct; 2) construction equipment is simple; 3) can be in position or dystopy implement, because having avoided digging muck haulage body, to pollute exposing to the open air of thing safer in original position reparation, can not cause disturbance to surrounding environment simultaneously; 4) with respect to other recovery techniques, the required cost of biological restoration is minimum, is only about 1/3～1/5 of traditional materialization reparation; 5) as long as water content is enough large, bioremediation technology can be used for all types of soil bodys, comprises hypotonicity soil.In view of above-mentioned advantage, microorganism recovery technique has been widely used in the reparation of Organic Pollution soil.
Tradition microorganism in situ recovery technique comprises biological ventilation method, biological reinforcing technology and biostimulation.Biological ventilation method is mainly by vacuum equipment or in conjunction with vacuum equipment and blast apparatus, the gas of carrying the nutriment such as nitrogen, phosphorus secretly is injected to the soil body by force, order about air and flow through soil body hole, promote the diffusion of nutriment in the soil body to be beneficial to the metabolism and growth of interior pathogenic microorganism, then gas is extracted out, the volatile poison in the soil body is also removed thereupon simultaneously.Biological reinforcing technology is to drop into efficient degrading bacteria in Polluted Soil, and growth of microorganism desired nutritional is provided simultaneously.Biostimulation be by regularly to adding the electron acceptors such as degradation bacteria desired nutritional element and hydrogen peroxide, oxygen in Polluted Soil, stimulate growth of microorganism to increase the biomass of microorganism, thus the object of accelerated degradation pollutant.
Soil body deep mixing technique originates from Japan and the Sweden of nineteen sixties, is applied to the earliest Geotechnical Engineering field, domesticly formally technique is applied to Geotechnical Engineering in 1977.This technology was expanded to by US and European country respectively in environmental geotechnical application the 1980s and the nineties.Soil body deep mixing method is a kind of in-situ treatment technology, the material of required injection---is generally cement---and is injected into the soil body by the hollow drill that is equipped with augers and stirring vane, drilling rod draws to different depth, and Stirring blade stirs the material of injection and the soil body.
Traditional biological ventilation method, biological reinforced and biostimulation are by air blast or other equipment the gas of carrying nutriment secretly are injected to the soil body by force through Injection Well, order about air and flow through soil body hole, drive nutriment to spread in the soil body, thereby accelerate growth of microorganism and metabolism, to reach contaminant degradation object.The problem that these technology exist has: first, Injection Well need be excavated to contaminated district, and excavation can produce spoir, and especially contaminated spoir need be through extra process.Secondly, these technology are only applicable in the unsaturation soil body, generally repair the degree of depth more shallow, and are greatly limited by soil body penetration, and in the time that damaged formation is positioned at saturation region or contaminated soil layer infiltration coefficient is lower or clay content is higher, these methods cannot be implemented.Again, gas inject amount is wayward, and injection rate is too small, can cause repairing not thorough; Injection rate is excessive, may cause volatility dusty gas to spill in atmosphere more than ground, causes further pollution.In addition, inject by force the air of carrying nutriment secretly by Injection Well, can cause the nutriment excessive concentration at Injection Well place, be unfavorable for growth of microorganism.When pollutant is larger along vertical distribution, and concentration changes when larger along vertical, and conventional method cannot be injected the appropriate gas of repairing for the pollution concentration of different depth.
In order to expand the validity of biological restoration in the lower soil body of infiltration coefficient, strengthen the application of biological restoration in layer deeper, need fully mix with the contaminated soil body repairing liquid, guarantee to repair liquid and contact fully with contaminated soil, thus effective degradation of contaminant.
Utility model content
technical problem:the utility model provides a kind of can guarantee to repair liquid and contaminated soil, the particularly abundant mixing of hypotonicity Polluted Soil, overcome the liquid low problem of diffusivity in the hypotonicity soil body of repairing, and can expand to underground 10 ~ 50 meters by repairing the degree of depth, weaken level of ground water and the impact of complex stratum condition on work progress, improve the microorganism in order to repair Polluted Soil of the buried pollution soil body of microorganism reparation hypotonicity validity and repair stake.
technical scheme:of the present utility model in order to repair Polluted Soil microorganism repair stake, comprise the boring of quincuncial arrangement, hole as single hole stake or multi-joint campshed, in boring, spray has reparation liquid.
The utility model microorganism is repaired in a kind of preferred version of stake, boring is single hole stake boring, the quincuncial arrangement form of boring is: same row hole drilling adjacent center spacing is X=1.1 ~ 1.5 D, two row hole drilling longitudinal center spacing are Y=1.1 ~ 1.5 D, the transverse center spacing that two row hole drillings stagger is X '=0.55 ~ 0.75 D, and wherein D is bore diameter.
The utility model microorganism is repaired in a kind of preferred version of stake, holes as multi-joint campshed boring, and the quincuncial arrangement form of boring is: same row hole drilling adjacent center spacing is X
1=L+ 0.1 ~ 0.5 R, two row hole drilling longitudinal center spacing are Y
1=1.1 ~ 1.5 R, the transverse center spacing that two row hole drillings stagger is X ' 1=L/2+0.05 ~ 0.25 R, and wherein L is every multi-joint campshed boring cross-section lengths, and R is every multi-joint campshed boring cross-sectional width.
beneficial effect:the utility model compared with prior art, has the following advantages:
Of the present utility model in order to repair the microorganism reparation stake of Polluted Soil, comprehensive microorganism recovery technique and soil body deep mixing technique.Pile body comprises original position Polluted Soil and repairs liquid, can provide growth of microorganism required nutrient by repairing liquid in pile body, thereby accelerate growth of microorganism degradation of contaminant reach the object of repairing Polluted Soil., lay out pile by quincunx meanwhile, in pile body, repair the permeable pile body that is diffused into of liquid around between stake in the Polluted Soil in scope, promote pile body microbial growth in scope internal contamination soil between stake around, thereby repair the pile body Polluted Soil in scope between stake around.Compared with conventional art, its superiority is embodied in: 1) stir piling technique and make the distribution of repairing liquid not limited by level of ground water and soil body penetration, saturation region and the hypotonicity soil body are stood good, and repair the degree of depth and deepen, according to run of steel, can deeply reach 10 ~ 50 meters; 2) do not need to excavate the soil body, do not produce spoir, especially can not make contaminated soil be exposed in air, prevented the secondary pollution of pollutant to human body and air; 3) repair liquid and inject in liquid mode, single boring injection rate is easy to control, and security is higher, has avoided conventional method because blast by force large quantity of air in the soil body, and causes more than volatility toxic gas spills into ground; 4) microorganism by quincunx arrangement is repaired stake Polluted Soil is repaired, and does not need to spread nutriment by Injection Well, therefore repairs liquid and mixes more evenly with the soil body, nutriment excessive concentration can not occur and is unfavorable for the phenomenon of growth of microorganism; 4) creep into and stir in formation of pile, can change and adjust flexibly the injection rate of repairing liquid according to different depth pollutant levels, when guaranteeing repairing effect, rationally saved reparation liquid consumption, reduced rehabilitation cost; 5) speed of application is fast, within 20 ~ 30 minutes, can complete a boring; 6) by stirring pile, little to surrounding environment disturbance, can not cause surrounding soil to destroy and significantly lifting of level of ground water.The utility model is easy and easily promote, and can greatly improve biological restoration effect, and the feasibility of expansion biological restoration in the hypotonicity soil body, has broad prospect of application.
Accompanying drawing explanation
Fig. 1 is construction flow chart in the utility model.
Fig. 2 is the schematic diagram that in the utility model, boring is arranged.
Fig. 3 is the schematic diagram that in the utility model, three united-row drillings are arranged.
The specific embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is done to further detailed description.The deeper formation of mentioning in the utility model refers to that the following buried depth in earth's surface is greater than the soil layer of 5 m.
Repair stake in order to the microorganism of repairing Polluted Soil, pile body comprises original position Polluted Soil and reparation liquid, and its construction process is:
1) smooth location, go out drilled pile position in place by following method for arranging measuring according to coordinate basic point: boring is by quincuncial arrangement, same row hole drilling adjacent center spacing is X=1.1 ~ 1.5 D, two row hole drilling longitudinal center spacing are Y=1.1 ~ 1.5 D, the transverse center spacing that two row hole drillings stagger is X '=0.55 ~ 0.75 D, and wherein D is bore diameter.
2) perform guide groove, agitation driller is in location, drilled pile position place, and in construction, vertical missing is controlled in 5 ‰.Inject agitation driller drilling rod repairing liquid, monitor simultaneously, regulate for flow quantity and pressure.Then start agitation driller and sink to stirring, when drill bit sinks down into the contaminated soil layer end face degree of depth, open hydraulic pump and will repair the liquid injection soil body, spray limit, limit rotary drill rod, in the time that drill bit sinks down into designed elevation, drill bit stops sinking.Stake end should continue on the spot hydrojet and stir more than 10 seconds.
3) promote drill bit and drilling rod, continue spray simultaneously and repair liquid, until drill bit while being promoted to the contaminated soil layer end face degree of depth, stopping spray and repairs liquid, drill bit is lifted out to earth's surface, complete a microorganism and repair pile driving construction.The soil body adhering on agitation driller drill bit and drilling rod is cleaned up; Repeat above-mentioned 1 ~ 8 step, carry out the construction of next pile.
4) microorganism is repaired the reparation liquid accelerate growth of microorganism in stake, and microorganism is repaired the Polluted Soil of repairing in stake; Repair liquid diffusion to repairing between stake stake in scope internal contamination soil simultaneously, accelerate growth of microorganism, microorganism is repaired repairing scope Polluted Soil between stake stake.
In a preferred version of the present utility model, agitation driller adopts multi-shaft stirring rig, it is multi-joint campshed that the microorganism that construction forms is repaired stake, and the drilled pile position of multi-joint campshed is determined according to following arrangement: boring is by quincuncial arrangement, and same row hole drilling adjacent center spacing is X
1=L+ 0.1 ~ 0.5 R, two row hole drilling longitudinal center spacing are Y
1=1.1 ~ 1.5 R, the transverse center spacing that two row hole drillings stagger is X '
1=L/2+0.05 ~ 0.25 R, wherein L is every multi-joint campshed boring cross-section lengths, R is every multi-joint campshed boring cross-sectional width.
In the utility model, boring cloth pitch of holes is relevant with soil body osmotic coefficient, increases with infiltration coefficient, and pile spacing should suitably increase.Take spacing definite in step 1) and step 5) as benchmark, spacing increases multiple as following table:
| Infiltration coefficient (cm/s) | Increase multiple |
| 10 -9～10 -8 | 1.0 |
| 10 -7～10 -6 | 1.05 |
| 10 -5～10 -4 | 1.1 |
| 10 -3～10 -2 | 1.15 |
In above-mentioned construction process, step 2) and 3) in to inject the pressure of repairing liquid be 500 ~ 800 kPa, repairing liquid is the mixed liquor of microbial nutrient solution or microbial nutrient solution and microbial strains.
Microorganism of the present utility model is repaired stake, is to obtain according to step 1) in the method for mentioned microorganism reparation Polluted Soil to step 3) construction.
Embodiment 1:
Repair a stake repairing method for the microorganism of benzene contaminated site, smooth location, performs guide groove, agitation driller is positioned on position, hole, starts agitation driller, drill bit sinks, drilling rod drives stirring vane rotation, injects reparation liquid by the liquid phase carrier pipe in drilling rod in soil simultaneously.Start agitation driller motor, when drill bit sinks down into the contaminated soil layer end face degree of depth, open hydraulic pump the reparation liquid of preparation is injected to the soil body, spray liquid limit, limit rotary drill rod, in the time that drill bit sinks down into designed elevation, drill bit stops sinking.Promote drill bit and drilling rod, until drill bit while being promoted to the contaminated soil layer end face degree of depth, stopping spray and repairs liquid, continue drill bit and drilling rod to be lifted out ground, complete a microorganism and repair pile driving construction.The soil body adhering on agitation driller drill bit and drilling rod is cleaned up, repeat above-mentioned steps, carry out the construction of next pile.
In the present embodiment, needing the soil body of repairing is the low-permeability soil that benzene pollutes, and water content is high, and buried depth is greater than 10 meters.Reparation means are indigenous anaerobic bacteria degradation of contaminant.Nutrient solution is 8.0 mM metabisulfite solutions of deoxygenation, and concrete grammar is as follows:
Smooth location, perform guide groove, agitation driller is positioned on position, hole, is full of whole induction system with nitrogen, start agitation driller motor, drill bit sinks, drilling rod drives stirring vane rotation, when drill bit sinks down into the contaminated soil layer end face degree of depth, opens hydraulic pump the metabisulfite solution of preparation is injected to the soil body, spray liquid limit, limit rotary drill rod, injection pressure is 550 kPa.The sodium sulphate volume nitrogen flowing out in fluid reservoir is filled.In the time that drill bit sinks down into designed elevation, drill bit stops sinking.
Promote drill bit and drilling rod, until drill bit while being promoted to the contaminated soil layer end face degree of depth, stops spray metabisulfite solution, continue drill bit and drilling rod to be lifted out ground, complete a drilling construction.Boring is by quincuncial arrangement, and same row hole drilling adjacent center spacing is X=1.1 ~ 1.5 D, and two row hole drilling longitudinal center spacing are Y=1.1 ~ 1.5 D, and the transverse center spacing that two row hole drillings stagger is X '=0.55 ~ 0.75 D, and wherein D is bore diameter.
Benzene is one of pollutant of greatest concern in fragrant hydrocarbon system, and carcinogenicity is strong, and Natural Attenuation speed is slow, and microbial degradation is that benzene pollutes the method for effectively sending out of repairing.Microorganism is repaired and is applicable to all types soil body, but poor when polluting soil body permeability, when water content is higher, conventional method for implanting cannot guarantee nutrient solution being uniformly distributed in the soil body, thereby limit the range of application that microorganism is repaired, weakened repairing effect.
Embodiment 2:
The microorganism of petroleum industry contaminated site is repaired a stake repairing method, and smooth location, performs guide groove, agitation driller is positioned on position, hole, starts agitation driller, drill bit sinks, drilling rod drives stirring vane rotation, injects reparation liquid by the liquid phase carrier pipe in drilling rod in soil simultaneously.Start agitation driller motor, when drill bit sinks down into the contaminated soil layer end face degree of depth, open hydraulic pump the reparation liquid of preparation is injected to the soil body, spray liquid limit, limit rotary drill rod, in the time that drill bit sinks down into designed elevation, drill bit stops sinking.Promote drill bit and drilling rod, until drill bit while being promoted to the contaminated soil layer end face degree of depth, stopping spray and repairs liquid, continue drill bit and drilling rod to be lifted out ground, complete a microorganism and repair pile driving construction.The soil body adhering on agitation driller drill bit and drilling rod is cleaned up, repeat above-mentioned steps, carry out the construction of next pile.
In the present embodiment, needing the soil body of repairing is the low-permeability soil that petroleum industry is polluted, and water content is high, and buried depth is greater than 10 meters.Reparation means are aerobic cultivation bacterium degradation of contaminant, the cow dung slurry that degradation bacteria is 1:25 by solid-to-liquid ratio is cultivated and is obtained, nutrient solution is 0.1 mg/mL ammonium sulfate, 0.2 mg/mL glucose, 0.1 mg/mL dipotassium hydrogen phosphate, 0.1 mg/mL potassium dihydrogen phosphate, and concrete grammar is as follows:
Smooth location, perform guide groove, agitation driller is positioned on position, hole, start agitation driller motor, drill bit sinks, and drilling rod drives stirring vane rotation, when drill bit sinks down into the contaminated soil layer end face degree of depth, open hydraulic pump by liquid phase carrier pipe in drilling rod to the cow dung slurry that injects nutrient solution and load degradation bacteria in soil, spray liquid limit, limit rotary drill rod, injection pressure is 600 kPa.In the time that drill bit sinks down into designed elevation, drill bit stops sinking.
Promote drill bit and drilling rod, until drill bit while being promoted to the contaminated soil layer end face degree of depth, stops the cow dung slurry of spray nutrient solution and load degradation bacteria, continue drill bit and drilling rod to be lifted out ground, complete a drilling construction.Boring is three united-row drillings, and by quincuncial arrangement, same row hole drilling adjacent center spacing is X
1=L+ 0.1 ~ 0.5 R, two row hole drilling longitudinal center spacing are Y
1=1.1 ~ 1.5 R, the transverse center spacing that two row hole drillings stagger is X '
1=L/2+0.05 ~ 0.25 R, wherein L is every three townhouse stake boring cross-section lengths, R is every three townhouse stake boring cross-sectional width.
Microorganism is repaired and is applicable to all types soil body, but poor when polluting soil body permeability, when water content is higher, conventional method for implanting cannot guarantee nutrient solution being uniformly distributed in the soil body, thereby limit the range of application that microorganism is repaired, weakened repairing effect.
Claims (3)
1. a microorganism is repaired stake, it is characterized in that, this reparation stake comprises the boring of quincuncial arrangement, and described boring is single hole stake or multi-joint campshed, and in boring, spray has reparation liquid.
2. a kind of microorganism is repaired stake according to claim 1, it is characterized in that, described boring is single hole stake boring, the quincuncial arrangement form of boring is: same row hole drilling adjacent center spacing is X=1.1 ~ 1.5 D, two row hole drilling longitudinal center spacing are Y=1.1 ~ 1.5 D, the transverse center spacing that two row hole drillings stagger is X '=0.55 ~ 0.75 D, and wherein D is bore diameter.
3. a kind of microorganism is repaired stake according to claim 1, it is characterized in that, described boring is multi-joint campshed boring, and the quincuncial arrangement form of boring is: same row hole drilling adjacent center spacing is X
1=L+ 0.1 ~ 0.5 R, two row hole drilling longitudinal center spacing are Y
1=1.1 ~ 1.5 R, the transverse center spacing that two row hole drillings stagger is X '
1=L/2+0.05 ~ 0.25 R, wherein L is every multi-joint campshed boring cross-section lengths, R is every multi-joint campshed boring cross-sectional width.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320724489.8U CN203664355U (en) | 2013-11-18 | 2013-11-18 | Microbial remediation pile for remedying contaminated soil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320724489.8U CN203664355U (en) | 2013-11-18 | 2013-11-18 | Microbial remediation pile for remedying contaminated soil |
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| CN203664355U true CN203664355U (en) | 2014-06-25 |
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| CN201320724489.8U Expired - Fee Related CN203664355U (en) | 2013-11-18 | 2013-11-18 | Microbial remediation pile for remedying contaminated soil |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103624080A (en) * | 2013-11-18 | 2014-03-12 | 东南大学 | Microbial contaminated soil remediation method and remediation pile thereof |
| CN109759437A (en) * | 2019-01-21 | 2019-05-17 | 胡鹏程 | A kind of chemical pollution soil remediation construction method and constructing device |
| CN110326479A (en) * | 2019-06-28 | 2019-10-15 | 中国一冶集团有限公司 | A method of shrub training plant is carried out using matrix mud mixing pile method improvement sandy soil |
-
2013
- 2013-11-18 CN CN201320724489.8U patent/CN203664355U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103624080A (en) * | 2013-11-18 | 2014-03-12 | 东南大学 | Microbial contaminated soil remediation method and remediation pile thereof |
| CN103624080B (en) * | 2013-11-18 | 2016-01-13 | 东南大学 | The method of microorganism remediation Polluted Soil and reparation stake thereof |
| CN109759437A (en) * | 2019-01-21 | 2019-05-17 | 胡鹏程 | A kind of chemical pollution soil remediation construction method and constructing device |
| CN110326479A (en) * | 2019-06-28 | 2019-10-15 | 中国一冶集团有限公司 | A method of shrub training plant is carried out using matrix mud mixing pile method improvement sandy soil |
| CN110326479B (en) * | 2019-06-28 | 2022-03-22 | 中国一冶集团有限公司 | Method for cultivating trees and shrubs by improving sandy soil through matrix mud stirring pile method |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140625 Termination date: 20161118 |
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| CF01 | Termination of patent right due to non-payment of annual fee |