CN110314928A - A kind of method of petroleum hydrocarbons migration during in-situ control is native - Google Patents
A kind of method of petroleum hydrocarbons migration during in-situ control is native Download PDFInfo
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- CN110314928A CN110314928A CN201910667725.9A CN201910667725A CN110314928A CN 110314928 A CN110314928 A CN 110314928A CN 201910667725 A CN201910667725 A CN 201910667725A CN 110314928 A CN110314928 A CN 110314928A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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Abstract
The present invention provides a kind of methods of petroleum hydrocarbons migration in in-situ control soil, include the following steps: that (1) determines the soil property of poluted region, and measure moisture content and oil content；(2) moisture content for adjusting poluted region is optimal moisture content；(3) it adds the first inorganic material to poluted region, conserves 12-24 hours, then add second of inorganic material, after maintenance 14-28 days to obtain the final product.Petroleum hydrocarbons migration in the method in-situ control soil of petroleum hydrocarbons migration in in-situ control soil of the present invention, due to sequentially adding flyash, lime in order, transformation by physical absorption to chemisorption is completed to Petroleum concentration soil, it realizes contamination prevention, provides sufficient time for later regulation and modified utilize.
Description
Technical field
The invention belongs to oil pollution fields, more particularly, to a kind of side of petroleum hydrocarbons migration in in-situ control soil
Method.
Background technique
Petroleum easily occurs in exploration of oil and gas field, exploitation, transport and use process to shed and leakage accident, destroys soil body ecology
System balancing causes contaminated sites.Petroleum is classified as the big toxic pollutant of potentially danger by the world, is adsorbed by soil particle
Petroleum has exchangeability and leachability, is easily released, and is reversible adsorption.Change with external environment, has in soil instable
Petroleum pollution will occur to migrate and be spread under the action of gravity and capillary force, constantly expansion Polluted area, jeopardize underground ring
Border safety.Oil pollution soil problem have become restrict regional economic development heavy burden and problem urgently to be resolved, to its into
The scientific and reasonable disposition of row is extremely urgent.Therefore, the migration of research in-situ control petroleum pollution in the soil, to soil protection ring
Border is of great significance.
Currently, petroleum hydrocarbons recovery technique master, including (soil displacement, gas phase extracting, extraction elute, are electronic physics
Repair, thermal desorption and charcoal absorption etc.), chemical (chemical oxidation, plasma degradation and photocatalytic degradation etc.), biology it is (raw
Object stimulation, biological reinforced and bio- ventilation) method.But all there is certain defect in the above method, though physical method technique satisfaction is wanted
It asks, but poor processing effect；The remaining more chemical reagent of chemical method easily causes the native secondary pollution of reparation；Biological method week
Phase is longer, costly, and the scope of application has very big environment limitation.
Seek in-situ control Petroleum concentration migrating technology, can not only realize that contamination is prevented, but also can repair for the later period
Multiple improvement and modified utilize create conditions.
Summary of the invention
In view of this, the present invention is directed to propose the method that petroleum hydrocarbons migrate in a kind of in-situ control soil, raw material are easy
It obtains, is cheap, widely applicable, migration control rate height, the convenient and fast method of constructing operation in terms of soil property, so that petroleum-type in soil
Contaminant transportation can be effectively controlled.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
The method of petroleum hydrocarbons migration, includes the following steps: during a kind of in-situ control is native
(1) it determines the soil property of poluted region, and measures moisture content and oil content；
(2) moisture content for adjusting poluted region is optimal moisture content；
(3) add inorganic material: add the first inorganic material to poluted region, by the first inorganic material with it is dirty
The soil in dye region stirs evenly, and maintenance adds second of inorganic material after 6-8 hour, by second inorganic material with it is described
The first inorganic material, poluted region soil stir evenly, maintenance 12-24 hour after add the third inorganic material, general
The third inorganic material and the soil of the first inorganic material, second of inorganic material, poluted region stir evenly, maintenance
After 14-28 days to obtain the final product.
Further, the additive amount of the first inorganic material is the 15-30% of poluted region soil quality, described
Second of inorganic material additive amount be poluted region soil quality 6-16%, the third inorganic material adds
Dosage is the 1-5% of poluted region soil quality.
Further, the additive amount of the first described inorganic material, second inorganic material and the third inorganic material are as follows:
When the oil content of the poluted region is 0-5%, the additive amount of the first inorganic material is 15-18%, and second inorganic
The additive amount of material is 6-8.5%, and the additive amount of the third inorganic material is 1-2%；The oil content of the poluted region
When for 5-12%, the additive amount of the first inorganic material is 18-25%, the additive amount 8.5-13% of second of inorganic material, the
The additive amount of three kinds of inorganic material is 2-3.5%；When the oil content of the poluted region is greater than 12%, the first inorganic material
The additive amount of material is 25-30%, the additive amount 13-16% of second of inorganic material, and the additive amount of the third inorganic material is
3.5-5%.
Further, the first described inorganic material is flyash, the mixing that second of inorganic material is NaOH and CaO
Object, the third inorganic material are Nano-meter SiO_22。
Further, second of inorganic material additive amount specifically: the oil content of the poluted region is 0-
When 5%, second of inorganic material additive amount: CaO 6-8%, NaOH 0.05-0.5%, the oil-containing of the poluted region
When rate is 5-12%, second of inorganic material additive amount: CaO 8-12%, NaOH 0.5-1%, the poluted region
Oil content be greater than 12% when, second of inorganic material additive amount: CaO 12-14%, NaOH 1-2%.
Further, curing step in the step (3) specifically: after inorganic material is mixed with poluted region soil,
Plastic covering film on it after the completion of maintenance, removes the plastic film.
Further, the optimum moisture content are as follows: when the soil property of poluted region is sandy soil, optimum moisture content 8-
12%；When the soil property of poluted region is sub- sandy soil, optimum moisture content 9-15%；When the soil property of poluted region is silt
When, optimum moisture content 16-22%；When the soil property of poluted region is sub- silt, optimum moisture content 12-20%；Work as quilt
When the soil property of Polluted area is clay, optimum moisture content 15-25%.
Flyash is in porous honeycomb structure, has biggish specific surface area and higher surface energy.Flyash contains itself
There is active group largely with stronger absorption property, easily in conjunction with the chemical chain of petroleum pollution: flyash can pass through
Intermolecular attraction adsorbs petroleum pollution, generates the absorption of dipole-dipole key.
Fine coal gray surface is there are Si-O-Si key, Al-O-Al key, and moisture forms aqueous lattice Ca in CaO absorbent earth
(OH)2·nH2O, under the action of NaOH is as chemical activator, a series of physical, chemical reaction occur for flyash and CaO, main
To include Ca (OH)2Crystallization reaction, ion-exchange reactions, carbonation reaction and pozzolanic reaction, these crystal mutually hinged one
It rises, and is combined into eutectic (C-S-C and C-A-H condensation product) with soil particle, provide more adsorbates for the absorption of petroleum
Point.
Under the alkali-activated carbonatite that NaOH is provided, aluminium mineral, activated silica in dissociation soil make itself and Ca (OH)2And water reaction life
It at cements such as calcium aluminate and calcium silicates, and is formed by colloid and reacts on absorption to petroleum again, realize irreversible chemical
Absorption.
Nano-meter SiO_22Particle is tiny, by the pozzolanic reaction strong with hydrated product further occurrence, promotes solidification absorption
It carries out, C-S-H and C-A-H flocculence gum material generated not only can be filled in hole or be wrapped in needle column entringite
Around crystal, the macrovoid in soil is refined, density reticular structure enhances the cementation between skeleton, early strength is improved, and
And C-S-H and C-A-H flocculence gum material generated, the absorption of ion pair can be formed with petroleum, further consolidating can not
Inverse chemisorption, reduces sensibility, enhances anti-solution absorption.
Key reaction process:
2CH2=CH-R-COOH+Ca2+→(CH2-CH-R-COO)2Ca
CaCO3(OH)x+YHOOR→CaCO3(OH)x-y[OOCR]y+H2O
By flyash, CaO, NaOH, Nano-meter SiO_22, Petroleum concentration soil between interaction, from physical absorption by
Layer realizes the angle of chemisorption, propose oil pollution soil it is in situ administer, the preconditioning technique in Pollution protection diffusion field, filling
Blank before physics, chemistry, the specific reclamation activities of biology, for later regulation and especially modified utilize provides chance.
The method of petroleum hydrocarbons migration, need to investigate live level of pollution in the in-situ control soil, and screening is suitble to
The inorganic material of petroleum hydrocarbons migration matches combination in in-situ control soil, is adjusted to oil pollution soil's water content,
Optimum moisture content state is modulated according to soil property, according to optimal proportion, sequentially adds flyash, CaO, NaOH and nanometer in order
SiO2Mixture achievees the purpose that petroleum hydrocarbons migration in control soil.Meanwhile the technology not only can effectively control migration
Diffusion reserves grace time for later regulation, and helps to realize modified utilization.
Compared with the existing technology, the method that petroleum hydrocarbons migrate in in-situ control soil of the present invention has following
Advantage:
(1) in in-situ control soil of the present invention in the method for petroleum hydrocarbons migration, due to successively adding in order
Enter flyash, NaOH, CaO, Nano-meter SiO_22, the transformation by physical absorption to chemisorption is completed to Petroleum concentration soil, is realized
Contamination prevention provides sufficient time for later regulation and modified utilize.
(2) in in-situ control soil of the present invention in the method for petroleum hydrocarbons migration, since fine coal gray surface is dredged
Loose porous, large specific surface area can carry out physical absorption to petroleum hydrocarbons in soil；Flyash main component is activity simultaneously
SiO2、Al2O3, pozzolanic reaction and curing reaction can occur with CaO, generate compound and CaO with hydraulic gelling performance
The chemisorption that petroleum pollution can be achieved achievees the effect that effectively to control petroleum hydrocarbons migration in soil.
(3) method of petroleum hydrocarbons migration is selected in in-situ control soil of the present invention, since NaOH is mainly logical
Hydrolysis is crossed in strong basicity, active SiO can be accelerated2And Al2O3It is dissolved out from flyash, enhancing and Ca2+Ionic reaction rate.
(4) method that petroleum hydrocarbons migrate in in-situ control soil of the present invention, Nano-meter SiO_22Material and aquation
Strong pozzolanic reaction has occurred in product, generates a large amount of flocculence gum materials.They are filled in hole or are wrapped in
Around needle column ettringite, so that reticular structure is more densely cross-linked, and the cementation between skeleton is enhanced.
(5) curing materials of the method choice of petroleum hydrocarbons migration are chosen in in-situ control soil of the present invention
CaO, flyash, flyash are trade waste, and CaO, powdered coal ash are easy to get, are cheap, being widely used in terms of soil property.
(6) method that petroleum hydrocarbons migrate in in-situ control soil of the present invention is to oil pollution soil's water content
It is adjusted, is adjusted to optimum moisture content state according to soil property, peomoting flyash and CaO, that volcanic ash occurs in soil is anti-
It answers, enhances adsorptivity, effectively improve the migration of petroleum hydrocarbons in control soil.
(7) method of petroleum hydrocarbons migration is revolved by sprinkling truck, tractor in in-situ control soil of the present invention
Machine operation is ploughed, engineering efficiency is improved, quickly oil pollution area can be handled, created conditions for later regulation.
Specific embodiment
In addition to being defined, technical term used in following embodiment has universal with those skilled in the art of the invention
The identical meanings of understanding.Test reagent used in following embodiment is unless otherwise specified conventional biochemical reagent；It is described
Experimental method is unless otherwise specified conventional method.
Below with reference to embodiment, the present invention will be described in detail.
Embodiment 1
The method of petroleum hydrocarbons migration, includes the following steps: during a kind of in-situ control is native
(1) according to " soil environment monitoring technical specification " (HJ/T166-2004) to Shen man defensive wall oil pollution area topsoil
Earth, which is crossed, layouts, and Polluted area orographic condition is relied on to divide 9 regions (area A-I) when sampled point is laid, and each region length and width are 80m
× 60m, and 17 collection points are set near oil pipeline, other regions of contaminated area are arranged 32 according to random distributed points principle and adopt
Collect point, acquire 49 sampling point surface layer soil samples altogether, then removes soil layer of stirring in the recent period, using multi-point sampling mixing method point
Analysis.Water Content Tests in Soil Samples is measured according to " centrifugal modeling method standard " (GB/T50123-1999).Oil is surveyed using YSL-8 infrared spectroscopy
Instrument quantitative determines soil sample, obtains oil content.Sea is surveyed up to RTK/GPS engineering coordinate high-precision satellite positioning RTK in utilization
Amount instrument V30 positions oil pollution zone boundary, and calculates contaminated area area.
(2) Shen man defensive wall oil pollution area investigation are as follows: oil pipeline near zone (region A, D, E, I) pollution level
Highest, oil content 8%, moisture content 10%, selected proportion are as follows: flyash 21%, NaOH 1%, is received CaO 10%
Rice SiO2It is 3%；Pollute slightly light, oil content 4%, moisture content 10%, selected proportion in other regions (region B, C, G)
Are as follows: flyash 18%, CaO 8%, NaOH 0.5%, Nano-meter SiO_22It is 2%.
(3) investigation display: Shen man defensive wall contaminated area soil is clay, area 23793m2, topsoil depth 60cm.It should
Soils In The Region optimum moisture content is 18%.Scene is sprinkled water comprehensively by sprinkling truck, soil moisture content is adjusted to optimal.
(4) Shen man defensive wall petroleum pipeline west side (partial region A, D, H, I and the area G) traffic convenience, landform is flat, first carries out
Construction, east side is then constructed.Construction operation is equal are as follows: according to the practical flyash in each area, CaO, NaOH, Nano-meter SiO_22Dosage first adds
Add flyash, stirred evenly by tractor rotary tillage machine, be allowed to be sufficiently mixed with soil, after 6-8 hours, adds CaO, NaOH,
It is stirred evenly, and conserved 12-24 hours, then add Nano-meter SiO_2 by tractor rotary tillage machine2, stirred by tractor rotary tillage machine
Uniformly, road roller rolls, and conserves 21 days.
(5) after conserving, 3 collection points are randomly selected in 49 sampled points of original laying, and (No. 5, No. 19, No. 44 are adopted
Collection point) it is sampled, it was sampled respectively at the 14th day, the 21st day, the 28th day of maintenance, and transport laboratory back and survey oil pollution
Object migration situation.Migration situation is shown in Table 1.Migration situation is shown in Table 1.
Embodiment 2
(1) oil pollution area topsoil is collected to Dong Jia according to " soil environment monitoring technical specification " (HJ/T166-2004)
It crosses and layouts, Polluted area orographic condition is relied on to divide 12 regions (area A-L) when sampled point is laid, each region length and width are 60m
× 80m, and 19 collection points are set near oil pipeline, other regions of contaminated area are arranged 43 according to random distributed points principle and adopt
Collect point, acquire 62 sampling point surface layer soil samples altogether, then removes soil layer of stirring in the recent period, using multi-point sampling mixing method point
Analysis.Water Content Tests in Soil Samples is measured according to " centrifugal modeling method standard " (GB/T50123-1999).Oil is surveyed using YSL-8 infrared spectroscopy
Instrument quantitative determines soil sample, obtains oil content.Sea is surveyed up to RTK/GPS engineering coordinate high-precision satellite positioning RTK in utilization
Amount instrument V30 positions oil pollution zone boundary, and calculates contaminated area area.
(2) Dong Jia collects oil pollution area investigation are as follows: oil pipeline near zone (region A, E, F, K, L) pollution level
Highest, oil content 11%, moisture content 9%, selected proportion are as follows: flyash 25%, CaO 12%, NaOH are
1.5%, Nano-meter SiO_22It is 4%；Pollute slightly light, oil content 2%, moisture content in other regions (region B, C, D, G, H, I, J)
It is 11%, selected proportion are as follows: flyash 15%, CaO 6%, NaOH 0.05%, Nano-meter SiO_22It is 1%.
(3) investigation display: it is clay, area 39744m that Dong Jia, which collects contaminated area soil,2, topsoil depth 60cm.The ground
Area's soil optimum moisture content is 16%.Scene is sprinkled water comprehensively by sprinkling truck, soil moisture content is adjusted to optimal.
(4) Dong Jia collects petroleum pipeline east side (A, F, J, K, L portion region and the area E, I) traffic convenience, and landform is flat, advanced
Row construction, remaining region is then constructed.Construction operation is equal are as follows: according to the practical flyash in each area, CaO, NaOH, Nano-meter SiO_22With
Amount, first adds flyash, is stirred evenly by tractor rotary tillage machine, be allowed to be sufficiently mixed with soil, after 6-8 hours, addition
CaO, NaOH are stirred evenly by tractor rotary tillage machine, and are conserved 12-24 hours, then add Nano-meter SiO_22, revolved by tractor
Cultivated machine stirs evenly, and road roller rolls, and conserves 21 days.
(5) after conserving, 3 collection points (No. 14, No. 31, No. 56 are randomly selected in 62 sampled points of original laying
Collection point), it was sampled respectively at the 14th day, the 21st day, the 28th day of maintenance, and transport laboratory back and survey petroleum pollution migration
Situation.Migration situation is shown in Table 1.
Embodiment 3
(1) according to " soil environment monitoring technical specification " (HJ/T166-2004) dialogue Jia Yao oil pollution area topsoil
Cross and layout, sampled point lay when rely on Polluted area orographic condition divide 9 regions (area A-I), each region length and width be 60m ×
80m, and 16 collection points are set near oil pipeline, 36 acquisitions are arranged according to random distributed points principle in other regions of contaminated area
Point acquires 52 sampling point surface layer soil samples altogether, then removes soil layer of stirring in the recent period, analyzes using multi-point sampling mixing method.
Water Content Tests in Soil Samples is measured according to " centrifugal modeling method standard " (GB/T50123-1999).Use YSL-8 infrared spectrometric oil detector
Soil sample is quantitative determined, oil content is obtained.Sea is measured up to RTK/GPS engineering coordinate high-precision satellite positioning RTK in utilization
Instrument V30 positions oil pollution zone boundary, and calculates contaminated area area.
(2) Bai Jiayao oil pollution area investigation are as follows: oil pipeline near zone (region C, E, F, G, H) pollution level
Highest, oil content 12%, moisture content 13%, selected proportion are as follows: flyash 30%, CaO 14%, NaOH 2%,
Nano-meter SiO_22It is 5%；；Slightly light, oil content 5% is polluted in other regions (region A, B, D, I), and moisture content 13% is selected
Proportion are as follows: flyash 21%, CaO 10%, NaOH 1%, Nano-meter SiO_22It is 3%.
(3) investigation display: white kiln contaminated area soil is silty clay, area 35466m2, topsoil depth 60cm.
This area's soil optimum moisture content is 17%.Scene is sprinkled water comprehensively by sprinkling truck, soil moisture content is adjusted to optimal.
(4) Bai Jiayao oil pollution area entirety traffic convenience, landform is flat, can successively construct in order.Construction is made
Industry is equal are as follows: according to the practical flyash in each area, CaO, NaOH, Nano-meter SiO_22Dosage first adds flyash, passes through tractor rotary tillage machine
It stirs evenly, is allowed to be sufficiently mixed with soil, after 6-8 hours, add CaO, NaOH, stirred evenly by tractor rotary tillage machine,
And it conserves 12-24 hours, then add Nano-meter SiO_22, stirred evenly by tractor rotary tillage machine, road roller rolls, and is within maintenance 21 days
It can.
(5) after conserving, 3 collection points are randomly selected in 52 sampled points of original laying, and (No. 9, No. 26, No. 47 are adopted
Collect point), it was sampled respectively at the 14th day, the 21st day, the 28th day of maintenance, and transport laboratory back and survey petroleum pollution migration feelings
Condition.Migration situation is shown in Table 1.
The petroleum migration situation of 1 embodiment 1-3 of table
Found out by sample result: due to flyash, CaO, NaOH, Nano-meter SiO_22And the phase interaction between petroleum pollution
With to petroleum hydrocarbons completion by the transformation of physical absorption to chemisorption, this point is to realize petroleum in in-situ control soil
The migration of pollutant provides opportunity.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of method of petroleum hydrocarbons migration in in-situ control soil, characterized by the following steps:
(1) it determines the soil property of poluted region, and measures moisture content and oil content；
(2) moisture content for adjusting poluted region is optimal moisture content；
(3) it adds inorganic material: the first inorganic material is added to poluted region, by the first inorganic material and contaminated area
The soil in domain stirs evenly, and maintenance added second of inorganic material after 6-8 hours, by second of inorganic material and described first
Kind of inorganic material, poluted region soil stir evenly, maintenance added the third inorganic material after 12-24 hours, by third
Kind inorganic material and the soil of the first inorganic material, second of inorganic material, poluted region stir evenly, and conserve 14-28
After it to obtain the final product.
2. the method for petroleum hydrocarbons migration in in-situ control soil according to claim 1, it is characterised in that: described
The additive amount of the first inorganic material is the 15-30% of poluted region soil quality, and second of inorganic material adds
Dosage is the 6-16% of poluted region soil quality, and the additive amount of the third inorganic material is poluted region soil
The 1-5% of quality.
3. the method for petroleum hydrocarbons migration in in-situ control soil according to claim 2, it is characterised in that: described
The additive amount of the first inorganic material, second inorganic material and the third inorganic material are as follows: the poluted region contains
When oil cut rate is 0-5%, the additive amount of the first inorganic material is 15-18%, and the additive amount of second of inorganic material is 6-
8.5%, the additive amount of the third inorganic material is 1-2%；When the oil content of the poluted region is 5-12%, the first
The additive amount of inorganic material is 18-25%, the additive amount 8.5-13% of second of inorganic material, the addition of the third inorganic material
Amount is 2-3.5%；When the oil content of the poluted region is greater than 12%, the additive amount of the first inorganic material is 25-
30%, the additive amount 13-16% of second of inorganic material, the additive amount of the third inorganic material are 3.5-5%.
4. the method for petroleum hydrocarbons migration in in-situ control soil according to claim 1, it is characterised in that: described
The first inorganic material is flyash, and the mixture that second of inorganic material is NaOH and CaO, the third inorganic material is nanometer
SiO2。
5. the method for petroleum hydrocarbons migration in in-situ control soil according to claim 4, it is characterised in that: described
Second of inorganic material additive amount specifically: when the oil content of the poluted region is 0-5%, second of inorganic material adds
Dosage: CaO 6-8%, NaOH 0.05-0.5%, when the oil content of the poluted region is 5-12%, second of nothing
Machine material additive amount: CaO 8-12%, NaOH 0.5-1%, when the oil content of the poluted region is greater than 12%, the
Two kinds of inorganic material additive amounts: CaO 12-14%, NaOH 1-2%.
6. the method for petroleum hydrocarbons migration in in-situ control soil according to claim 1, it is characterised in that: described
Curing step in step (3) specifically: after inorganic material is mixed with poluted region soil, plastic covering film, is supported on it
After the completion of shield, the plastic film is removed.
7. the method for petroleum hydrocarbons migration in in-situ control soil according to claim 1, it is characterised in that: described
Optimum moisture content are as follows: when the soil property of poluted region is sandy soil, optimum moisture content 8-12%；When the soil property of poluted region
When for sub- sandy soil, optimum moisture content 9-15%；When the soil property of poluted region is silt, optimum moisture content 16-22%；
When the soil property of poluted region is sub- silt, optimum moisture content 12-20%；When the soil property of poluted region is clay,
Optimum moisture content is 15-25%.
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