CN105665438B - A kind of method of the soil petroleum hydrocarbon contaminated using phytoremediation severe - Google Patents
A kind of method of the soil petroleum hydrocarbon contaminated using phytoremediation severe Download PDFInfo
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- CN105665438B CN105665438B CN201610020535.4A CN201610020535A CN105665438B CN 105665438 B CN105665438 B CN 105665438B CN 201610020535 A CN201610020535 A CN 201610020535A CN 105665438 B CN105665438 B CN 105665438B
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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
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Abstract
The present invention relates to a kind of method of the soil petroleum hydrocarbon contaminated using phytoremediation severe, the specific steps are：A certain amount of sodium selenite is added in high concentration petroleum hydrocarbon contaminated soil topsoil, topsoil selenium element content is made to reach selenium-rich level, plant seed is sowed or by seedling cultivation in the soil by selenium addition processing again, when plant grows to the maturity period, to plant-cutting or pull out, and harmless treatment is carried out, so repeatedly until soil oil hydrocarbon and PAHs content reaches environmental safety standard.Previous experiments are found, plant grows in high concentration petroleum hydrocarbon soil significantly to be inhibited, and after adding low dosage sodium selenite in the soil, detection finds that plant leaf blade photosynthetic capacity improves, root system decomposing petroleum hydrocarbon ability is remarkably reinforced, therefore the beneficial effects of the invention are as follows add low dosage selenium in soil to improve repairing effect of the plant to high concentration petroleum hydrocarbon.
Description
Technical field
The present invention relates to a kind of petroleum hydrocarbon contaminated plant restoration methods of the severe based on soil spraying selenium, are specially applied in soil
Add a certain amount of selenium, improve the plant tolerance and absorbability petroleum hydrocarbon contaminated to high concentration.
Background technology
Petroleum industry brings many environmental problems while rapid development.Oil exploration, exploitation, refinement, processing and
Often soil is polluted during transport, the processing of petroleum pollution has become countries in the world environment urgently to be resolved hurrily
One of problem.In these soil with serious petroleum pollution, pollutant load is high, is destroyed soil texture and function.According to
It investigates, the soil around the Oilfield Operation District of most of China generally all receives more serious oil pollution, some oil
Even not even a blade of grass grows for contaminated soil.Most component for several times in oil is particularly some unsaturation hydrocarbons, in soil
Animals and plants have very big toxic action, and wherein polycyclic aromatic hydrocarbon compounds (PAHs) toxicity is maximum, and crop germination and emergence rate is caused to drop
Low, setting percentage declines, and resistant to lodging, disease and insect resistance ability reduces, while structure of community and microbiota shadow to microorganism
Sound is larger so that the activity of contaminated soil further reduces.PAHs can also enter human body by food chain, influence liver, kidney and the heart
Vascular system generates harm to the mankind, even results in canceration.
Mainly there are three categories currently for the administering method of petroleum hydrocarbon contaminated soil：Physical, chemical method and biological prosthetic
Method.It is wherein biological prosthetic due to its processing cost is low, non-secondary pollution, can treatment in situ, public's acceptance level is high and effect is good
The advantages that, there is boundless development potentiality and application prospect.Biological prosthetic type mainly includes microorganism remediation, plant
Reparation and microorganism-plant combined reparation, wherein and microorganism-plant combined repair is that contaminated soil bioremediation technology is ground
The new development studied carefully, the advantages of having both microorganism remediation and phytoremediation.However, when soil petrochina hydrocarbon excessive concentration (is more than
20g/kg soil) when, not only Soil Microorganism is difficult to survive, and the growth of big portion plant can be also suppressed, existing biology
Restorative procedure is difficult to carry out.Currently the improvement of severe petroleum hydrocarbon contaminated soil is mainly handled using surfactant washing,
But the use of surfactant can bring secondary environmental pollution.Therefore, up to the present, high concentration petroleum hydrocarbon contaminated soil
Reparation is still a problem urgently to be resolved hurrily of environmental science.
Invention content
The technical problems to be solved by the invention are：A kind of administering method to high concentration petroleum hydrocarbon contaminated soil is provided,
By adding a certain amount of selenium to high concentration petroleum hydrocarbon contaminated soil, soil is made to reach selenium-rich level (1-2mg/kg soil), is carried
High plant is to the tolerance of high concentration petroleum hydrocarbon.
The technical solution adopted in the present invention is：A kind of high concentration petroleum hydrocarbon contaminated soil selenium fortification of plants restorative procedure.
The above method specifically includes following steps：
A certain amount of sodium selenite is added in the petroleum hydrocarbon contaminated upper soll layer of high concentration, contains topsoil selenium element
Amount reaches selenium-rich level, then serike seedling or sowing vegetable seeds on the soil by selenium addition processing, when plant is long
To the maturity period, plant is pulled out and carries out harmless treatment, so repeatedly until soil oil hydrocarbon content reaches Environmental security mark
It is accurate.Sodium selenite solution is specifically uniformly sprayed on to high concentration petroleum hydrocarbon contaminated soil surface, it is with tool that sodium selenite is molten
Liquid and the abundant mixing of surface layer 20cm depth soil.A certain amount of selenium is added to poor selenium soil, soil selenium contamination will not be caused, it can be with
Improve the physicochemical property of local soil.
Petroleum hydrocarbon contaminated soil includes oil pollution, contaminated by diesel oil, gasoline contamination or its mixed type contaminated soil.
A concentration of 20-50g/kg soil of petroleum hydrocarbon of the soil petrochina hydrocarbon pollution., under this concentration plant growth by
Apparent to inhibit, Soil Microorganism is difficult to survive.
The soil horizon surface layer refers to the soil horizon of soil depth 20cm, and the sodium selenite that addition is a little measured makes upper soll layer
Selenium-rich content reaches 1-2mg/kg.It is selenium-rich soil that Se content in soil usually is higher than 0.5mg/kg, and is poor selenium less than this value
Soil.In technical scheme of the present invention, it would be desirable to selenium amount be added to be scaled sodium selenite (Na2SeO3) quality, and by required selenous acid
Sodium is dissolved in water；
The plant seedlings or vegetable seeds include beggar-ticks, clover, Alternanthera philoxeroides.
Industrial sodium selenite is cheap, relatively low with present invention processing high concentration petroleum hydrocarbon contaminated soil control expense, real
Border application value is big.
A certain amount of sodium selenite is added in high concentration petroleum hydrocarbon contaminated soil topsoil, makes topsoil selenium element
Content reaches selenium-rich level, then plant seed is sowed or by seedling cultivation in the soil by selenium addition processing, works as plant
The maturity period is grown to, to plant-cutting or is pulled out, and carries out harmless treatment, so repeatedly until soil oil hydrocarbon and PAHs
Content reaches environmental safety standard.If benzo (a) pyrene content is less than 0.10mg/kg, that is, reach environmental safety standard.Energy of the present invention
Plant is improved to the petroleum hydrocarbon contaminated tolerance of soil middle and high concentration, and plant is promoted to absorb petroleum hydrocarbon, and repair time is short, carries
High effect of plant restoration.Since industrial sodium selenite is cheap, high concentration petroleum hydrocarbon contaminated soil expense is administered with the present invention
It is relatively low, there is higher actual application value.Previous experiments find that plant grows in high concentration petroleum hydrocarbon soil significantly to be pressed down
System, and after adding low dosage sodium selenite in the soil, detection finds that plant leaf blade photosynthetic capacity improves, root system degradation stone
Petroleum hydrocarbon ability is remarkably reinforced, therefore the beneficial effects of the invention are as follows add low dosage selenium in soil to improve plant to high concentration stone
The repairing effect of petroleum hydrocarbon.
Specific embodiment
Embodiment one
Area is 100m2Petroleum hydrocarbon serious pollution area, a concentration of 30g/kg soil of soil petroleum hydrocarbon after testing, Selenium in Soil
A concentration of 0.1mg/kg, soil density 25kg/m3.Topsoil selenium concentration is made to reach 1mg/kg, then soil should increase selenium
0.9mg/kg soil, sodium selenite (Na2SeO3) selenium element content for 46%, therefore dosage of sodium selenite is
1.9mg/kg is calculated：Area 100m2, depth 20cm soil need sodium selenite 0.98g, 0.98g sodium selenites are dissolved in 5L water,
And abundant mixing.Solution with spraying device is uniformly sprayed on to severe petroleum hydrocarbon contaminated soil surface, sprinkling area's soil is ploughed
0.2m is deep, makes mixing.By beggar-ticks seed be seeded in more than by plus selenium soil on, thickness of sowing is：100-200/m2,
When beggar-ticks grows to seed stage, which dial and is removed, and carry out harmless treatment, so repeatedly to soil greasy dirt content
Reach environmental safety standard.
Embodiment two
Area is 100m2Petroleum hydrocarbon serious pollution area, a concentration of 30g/kg soil of soil petroleum hydrocarbon after testing, Selenium in Soil
A concentration of 0.1mg/kg, soil density 25kg/m3.Topsoil selenium concentration is made to reach 1mg/kg, then soil should increase selenium
0.9mg/kg soil, sodium selenite (Na2SeO3) selenium element content for 46%, therefore dosage of sodium selenite is
1.9mg/kg is calculated：Area 100m2, depth 20cm soil need sodium selenite 0.98g, 0.98g sodium selenites are dissolved in 5L water,
And abundant mixing.Solution with spraying device is uniformly sprayed on to severe petroleum hydrocarbon contaminated soil surface, sprinkling area's soil is ploughed
0.2m is deep, makes mixing.By height about 5cm beggar-ticks seedling cultivation on the above soil by adding selenium, planting density is：
50-60 plants/m2, when beggar-ticks grows to seed stage, which dial and is removed, and carry out harmless treatment, so repeatedly extremely
Soil greasy dirt content reaches environmental safety standard.
Embodiment three
Area is 200m2Petroleum hydrocarbon serious pollution area, a concentration of 50g/kg soil of soil petroleum hydrocarbon after testing, Selenium in Soil
A concentration of 0.2mg/kg, soil density 25kg/m3.Topsoil selenium concentration is made to reach 2mg/kg, then soil should increase selenium
1.8mg/kg soil, sodium selenite (Na2SeO3) selenium element content be 46%.Therefore dosage of sodium selenite is
1.9mg/kg is calculated：Area 100m2, depth 20cm soil need sodium selenite 3.91g, 3.91g sodium selenites are dissolved in 10L water,
And abundant mixing.Solution with spraying device is uniformly sprayed on to severe petroleum hydrocarbon contaminated soil surface, sprinkling area's soil is ploughed
0.2m is deep, makes mixing.By clover seed be seeded in more than by plus selenium soil on, thickness of sowing is：200-400/m2,
When clover grows to 30cm high or so, plant top being cradled and harmless public processing, clover is herbaceos perennial,
Root tillering ability and power of regeneration are strong, resistance to trimming, and update leaflet can be grown in 10 days after cradling.So repeatedly to soil greasy dirt
Content reaches environmental safety standard.
Example IV
Area is 100m2Petroleum hydrocarbon serious pollution area, a concentration of 30g/kg soil of soil petroleum hydrocarbon after testing, Selenium in Soil
A concentration of 0.1mg/kg, soil density 25kg/m3.Topsoil selenium concentration is made to reach 1mg/kg, then soil should increase selenium
0.9mg/kg soil, sodium selenite (Na2SeO3) selenium element content for 46%, therefore dosage of sodium selenite is
1.9mg/kg is calculated：Area 100m2, depth 20cm soil need sodium selenite 0.98g, 0.98g sodium selenites are dissolved in 5L water,
And abundant mixing.Solution with spraying device is uniformly sprayed on to severe petroleum hydrocarbon contaminated soil surface, sprinkling area's soil is ploughed
0.2m is deep, makes mixing.By height about 10cm clover seedling kinds on the above soil by adding selenium, planting density is：
100-200 plants/m2, when clover grows to seed stage, which dial and is removed, and carry out harmless treatment, clover life
Life power is strong, and annual spring and autumn can respectively plant once, so reach environmental safety standard to soil greasy dirt content repeatedly.
Embodiment five
Area is 200m2Petroleum hydrocarbon serious pollution area, a concentration of 50g/kg soil of soil petroleum hydrocarbon after testing, Selenium in Soil
A concentration of 0.2mg/kg, soil density 25kg/m3.Topsoil selenium concentration is made to reach 2mg/kg, then soil should increase selenium
1.8mg/kg soil, sodium selenite (Na2SeO3) selenium element content be 46%.Therefore dosage of sodium selenite is
1.9mg/kg is calculated：Area 100m2, depth 20cm soil need sodium selenite 3.91g, 3.91g sodium selenites are dissolved in 10L water,
And abundant mixing.Solution with spraying device is uniformly sprayed on to severe petroleum hydrocarbon contaminated soil surface, sprinkling area's soil is ploughed
0.2m is deep, makes mixing.By Alternanthera philoxeroides seed be seeded in more than by plus selenium soil on, thickness of sowing is：200-300
Grain/m2, when Alternanthera philoxeroides grows to seed stage, oenothera biennis dial and is removed, and carry out harmless treatment, so repeatedly to soil
Greasy dirt content reaches environmental safety standard.
Embodiment six
Area is 100m2Petroleum hydrocarbon serious pollution area, a concentration of 30g/kg soil of soil petroleum hydrocarbon after testing, Selenium in Soil
A concentration of 0.1mg/kg, soil density 25kg/m3.Topsoil selenium concentration is made to reach 1mg/kg, then soil should increase selenium
0.9mg/kg soil, sodium selenite (Na2SeO3) selenium element content for 46%, therefore dosage of sodium selenite is
1.9mg/kg is calculated：Area 100m2, depth 20cm soil need sodium selenite 0.98g, 0.98g sodium selenites are dissolved in 5L water,
And abundant mixing.Solution with spraying device is uniformly sprayed on to severe petroleum hydrocarbon contaminated soil surface, sprinkling area's soil is ploughed
0.2m is deep, makes mixing.By height about 5cm Alternanthera philoxeroides seedling kinds on the above soil by adding selenium, planting density is：
50-60 plants/m2, when Alternanthera philoxeroides grows to seed stage, oenothera biennis dial and is removed, and carry out harmless treatment, so repeatedly
Reach environmental safety standard to soil greasy dirt content.
Claims (3)
- A kind of 1. method of the soil petroleum hydrocarbon contaminated using phytoremediation severe, which is characterized in that in the dirt of high concentration petroleum hydrocarbon A certain amount of sodium selenite is added in the upper soll layer of dye, making upper soll layer selenium-rich content, soil horizon surface layer is up to 1-2mg/kg Refer to the soil horizon of soil depth 20cm, a concentration of 20-50g/kg soil of petroleum hydrocarbon of the petroleum hydrocarbon contaminated upper soll layer of the high concentration Earth, then serike seedling or sowing vegetable seeds on the soil by selenium addition processing, when plant grows to the maturity period, will plant Object is pulled out and carries out harmless treatment, so repeatedly until soil oil hydrocarbon content reaches environmental safety standard.
- 2. the method for the soil petroleum hydrocarbon contaminated using phytoremediation severe according to claim 1, which is characterized in that stone Petroleum hydrocarbon contaminated soil includes oil pollution, contaminated by diesel oil, gasoline contamination or its mixed type contaminated soil.
- 3. the method for the soil petroleum hydrocarbon contaminated using phytoremediation severe according to claim 1, which is characterized in that institute The plant seedlings or vegetable seeds stated include beggar-ticks, clover, Alternanthera philoxeroides.
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Inventor after: Huang Yingping Inventor after: Song Yizhi Inventor after: Liu Huigang Inventor after: Huang Jueying Inventor before: Huang Yingping Inventor before: Liu Huigang Inventor before: Song Yizhi Inventor before: Huang Jueying |
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