CN104307859B - A kind of method of the micro-pollution of restoration facilities Heavy Metal in Vegetable Farm Soil - Google Patents
A kind of method of the micro-pollution of restoration facilities Heavy Metal in Vegetable Farm Soil Download PDFInfo
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Abstract
The present invention discloses a kind of method of micro-pollution of restoration facilities Heavy Metal in Vegetable Farm Soil.Utilize rye grass contaminated soil micro-to covered soil heavy metal to carry out phytoremediation, reduce the total metals in soil；Charcoal is utilized to reduce the biological effectiveness of covered soil heavy metal in soil in the normal planting process of vegetables.Charcoal is the agricultural organic wastes such as bamboo surplus material of processing, stalk, rice husk solid product arrived through 500～700 DEG C of pyrolysis carbonizations under conditions of anoxic, pulverizes with pulverizer, crosses 20 mesh sieves and prepare.Economical and effective of the present invention, to implement simply, not easily cause secondary pollution, raw material sufficient and cheap, is applicable not only to Vegetable Company, also is adapted for peasant's family expenses；Regulate charcoal and the amount of application of fertilizer according to actual pollution situation and effect of plant restoration, improve heavy metal-polluted soil repairing effect, reduce cost；While reaching repairing heavy metal pollution, improve soil quality, promote the Natural Circulation of farmland nutrient.
Description
Technical field
The invention belongs to heavy metal soil ecology recovery technique field, relate to a kind of restoration facilities vegetable field soil
The method of the micro-pollution of earth heavy metal, specially rye grass phytoremediation combine charcoal passivation treatment facility vegetables
The method of the micro-contaminated soil of vegetable plot heavy metal.
Technical background
Vegetables, as the important component part of agricultural product, are people's life indispensable requisites, high-quality,
The production of vegetables of safety is one of important symbol of reaching a new level of city vegetable basket project.Recently as
The adjustment of China's structure of agricultural production, facilities vegetable plantation develops rapidly, relevant covered soil soil swelling-shrinkage because of
The report of son day by day increases.Wherein the heavy metal pollution of soil environment is paid close attention to by countries in the world, it has also become
The important topic that the current ecological agriculture is urgently to be resolved hurrily with sustainable agriculture development.Vegetables are to some weight
Metallic element has certain accumulation ability, the heavy metal pollution being present in soil, can be by polluting vegetables
Dish enters food chain, and then enters human body, causes slow poisoning, threatens human health.In agricultural product
Heavy-metal residual and soil pollution have close relationship, soil to be to affect the source of agricultural product quality and safety
Factor.In March, 2011, State Council formally gave an written reply " the heavy metal Comprehensive Preventing that State Bueau of Environmental Protection proposes
Control " 12 " planning ".
At present, the factor causing covered soil heavy metal pollution of soil mainly has 3 classes: one is that air sinks
Fall；Two is sewage irrigation；Three is rough land management practices.The reparation of heavy metal pollution of soil is main
There are the modes such as peripheral doses, chemical redemption and biological prosthetic (including phytoremediation, microorganism remediation).
Peripheral doses mainly has soil moved in improve the original method, Physical Separation Technology, electric repairing technique etc..Chemical redemption master be to
Soil adds phosphoric acid salt precipitating reagent or is reached the effect of heavy metal-passivated pollutant by regulation soil pH
Really.Above-mentioned recovery technique is mainly used in the soil that pollution condition is the most serious, need to expend substantial amounts of manpower,
Material resources, financial cost is higher.Micro-contaminated soil refer to heavy metal pollution Nemerow Index between 0.7～2 it
Between soil.Agricultural management system improperly, such as excessive applying fertilizer, agricultural chemicals, growth auxiliary agent etc. be
Cause the soil main reason of micro-pollution.The vegetable soil of micro-pollution, peripheral doses and chemistry are repaiied
Multiple financial cost is higher, has the risk causing secondary pollution, it is possible to destroy original soil texture and micro-life
Thing fauna.The research ratio of biological prosthetic middle plant soil restoration heavy metal is wide, and price is the cheapest,
Simple to operate, environmental friendliness is higher, has more preferable application prospect.
Phytoremediation is to utilize plant and edaphon to reduce heavy metal pollution or the environmental toxicity of heavy metal
Method, be a kind of cost-effective, environmentally friendly and for the public accept recovery technique.But repair
The multiple general growth cycle of plant is long, and later stage process problem must be prudent.The cultivation that rye grass is important is herded
Grass and green manure crop.Ryegrass Growth is fast, tiller is many, be resistant to herd, have that winter resistance is good, be difficult to lodging,
Germination is fast, regeneration is rapid and the feature of high yield, and seedling growth is the most vigorous, after sowing 30～40 days
Gather in fresh grass.Its feature meet the feature growth rate that preferable heavy metal rehabilitation plant should possess high,
Ground biomass is more, target heavy metal is had to preferable tolerance, have good fitting to natural environment and climate
Ying Xing, easy to raise and results.Possesses the potential as heavy metal rehabilitation plant.
Charcoal refers to that living beings such as timber, agricultural waste material, plant tissue or animal skeleton etc. are lacking
The product that under the conditions of oxygen and relative temperature relatively low (< 700 DEG C), pyrolysis charring is formed, solubility is extremely low, tool
There are height carboxylic esterification and aromatization structure, have bigger porosity and specific surface area, high stability.
Using charcoal as a kind of improving soil quality, having increased the method that is manured into soil of modifying agent of soil carbon sequestration
Attract wide attention.On the one hand the absorption affinity of charcoal, resistance to oxidation and antibiont capacity of decomposition are utilized
And functional group's heavy metal of apparent height aromatization structure and part of hydroxyl, phenolic hydroxyl group and carbonyl is organic
With inorganic states pollutant height affinity characteristic, be used as passivator at the same time as plant growth needed for seek
Support the sustained release agent of material, reduce Soil Nutrient Leaching, promote that soil agreegate is formed, improve soil quality,
While realizing the passivation to heavy metal-polluted soil, promote plant growth, improve crop yield and quality；
On the other hand charcoal is applied to farmland, the discharge of farmland ecosystem greenhouse gases, increase can be reduced
Soil carbon fixing efficiency and carbon base in soil total amount.
Utilize organic waste to prepare the environment-friendly materials such as charcoal and improve the phytoremediation of heavy metal, both
The recycling of agricultural waste gurry can be realized, promote the Natural Circulation of farmland nutrient, can reach again
Administer the purpose of Soil Environmental Pollution, it is achieved the Sources controlling of agricultural product security, General Promotion vegetables quality
Level of security, it is ensured that the safety in production of facilities vegetable and the efficient fast development of vegetables industry.
Summary of the invention
It is an object of the invention to for the deficiencies in the prior art, it is provided that a kind of restoration facilities vegetable soil weight
The method of the micro-pollution of metal, specifically one combine rye grass plantation and carry out restoration facilities vegetables with passivation input
The method of ground heavy metal pollution of soil.It is that a kind of economical and effective, the convenient to carry out rye grass that utilizes are planted
Reduce covered soil heavy metal in soil total amount, and utilize charcoal will soil not absorbed by rye grass
Heavy metal passivation method.For reducing the total metals in covered soil soil and biologically effective
Property, solve covered soil and cause because of heavy metal pollution of soil its sustainable use and quality of agricultural product
Impact.
For achieving the above object, the technical solution used in the present invention is as follows:
Step (1), the content of beary metal measured in micro-contaminated soil to be repaired (unit is mg/kg), and by
Formula (1) calculates its heavy metal pollution of soil Nemerow Index；Then this heavy metal pollution of soil Buddhist nun is judged
Whether plum sieve index is between 0.7～2, if then carrying out step (2), if the most inapplicable the inventive method；
Described heavy metal pollution of soil Nemerow Index be can be calculated by formula (1):
P=[(Pmax2+Pave2)/2]1/2 (1)
In formula, Pmax is (Pi) max, for the maximum of monomial pollution exponent Pi；Pave is (Pi) ave,
Arithmetic mean of instantaneous value for monomial pollution exponent Pi；
Described monomial pollution exponent Pi be can be calculated by formula (2):
Pi=Ci/Si (2)
In formula, monomial pollution exponent Pi is the environmental quality index of pollutant in soil i；Ci is in soil
The measured concentration of pollutant i, unit is mg/kg；S is the two-level appraisement standard of pollutant i, and unit is
Mg/kg can refer to " standard of soil environment quality GB15618-2008 ".
Step (2), the to be repaired micro-contaminated soil chosen step (1) by planting rye grass are planted
Thing is repaired, and reduces the content of beary metal in micro-contaminated soil to be repaired；
The application rate of described rye grass is more than or equal to 40g/m2；
Step (3), when rye grass highly more than or equal to 25 centimetres time, can gather in；
The rye grass of results is different according to its content of beary metal, does herbage and uses or ashing landfill；
Step (4), measure after above-mentioned steps (3) rye grass is gathered in a huge sum of money in micro-contaminated soil to be repaired
Belong to content and heavy metal bio-available Zn concentration, and calculated its heavy metal pollution of soil Ni Meiluo by formula (1) and refer to
Number；Then judge whether heavy metal content in soil exceedes " standard of soil environment quality GB15618-2008 "
Secondary standard, if otherwise carrying out step (5), if then carrying out step (6)；
Described heavy metal bio-available Zn concentration include exchangeable species, carbonate combine state, Fe-Mn oxide and
Organically combine state；
Measuring method can be Tessier five step continuous extraction (1979).
Step (5) is if heavy metal content in soil is less than " standard of soil environment quality GB15618-2008 "
Secondary standard, then judge heavy metal-polluted soil Nemerow Index whether more than 0.7, if otherwise directly above-mentioned
Step (7) is carried out after micro-contaminated soil to be repaired applying fertilizer after the harvesting of step (3) rye grass；If
It is micro-contaminated soil to be repaired to apply organic before planting vegetable after above-mentioned steps (3) rye grass is gathered in
Fertile is charcoal (the i.e. 57t/hm that dry ground weighs 1 with amount of application2), reduce a huge sum of money in covered soil soil
The biological effectiveness belonged to, finally carries out step (7)；
Step (6) is if heavy metal content in soil exceedes " standard of soil environment quality GB15618-2008 "
Secondary standard, then judges whether heavy metal available state is higher than the 45 of content of beary metal, if then planting
Micro-contaminated soil to be repaired applies after above-mentioned steps (3) rye grass is gathered in fertilizer with biological before vegetables
Charcoal, the amount of application of charcoal is more than 3 (i.e. 171t/hm of dry ground weight2), and less than or equal to dry ground weight
5 (i.e. 285t/hm2), reduce the biological effectiveness of covered soil heavy metal in soil, finally carry out
Step (7)；If otherwise before planting vegetable above-mentioned steps (3) rye grass gather in after micro-Polluted Soil to be repaired
Applying fertilizer and charcoal in earth, the amount of application of charcoal weighs 1 (i.e. 57t/hm more than dry ground2), and
And less than or equal to 3 (i.e. 171t/hm of dry ground weight2), reduce the life of covered soil heavy metal in soil
Thing validity, finally carries out step (7)；
Step (7), general planting vegetables.
Fertilizer described in step (5), (6) is that market is bought, depending on amount of application is according to vegetable variety；
Charcoal described in step (5), (6) be agricultural organic waste under conditions of anoxic through 500～
The solid product that 700 DEG C of pyrolysis carbonizations obtain, pulverizes with pulverizer, crosses 20 mesh sieves and prepares.
Agricultural organic waste is mixed by bamboo surplus material of processing, stalk, rice husk.
Present invention have the advantage that
1, economical and effective of the present invention, implement simply, not easily cause secondary pollution, raw material is sufficient and price is low
Honest and clean, it is applicable not only to Vegetable Company, also is adapted for peasant's family expenses.
2, the heavy metal-polluted soil repair materials that the present invention relates to all has respective distinctive effect: (1) rye grass
It is important tame forage grass and green manure crop, its Seedling height rate, high ground biomass, growth cycle be short,
Heavy metal tolerates preferable, easy to raise well-adjusted to natural environment and climate and the characteristic of results, is allowed to
Possess as heavy metal rehabilitation plant to reduce the potential of heavy metal content in soil.(2) charcoal is because of it
The characteristic of absorption affinity, resistance to oxidation and antibiont capacity of decomposition can be by as heavy metal deactivator, its surface
Highly functional group's heavy metal of aromatization structure and part of hydroxyl, phenolic hydroxyl group and carbonyl has high affinity,
Reduce passive metal reactivation and cause the risk of secondary pollution, be the sustained release agent of a kind of nutriment,
Soil Nutrient Leaching can be reduced, promote that soil agreegate is formed, improve soil quality, reduce executing of fertilizer
Consumption and then minimizing enter the heavy metal amount of soil because of Agricultural management system.Meanwhile, the using of charcoal
Crop yield can be effectively increased, suppress executing of corps diseases, minimizing agricultural chemicals and crop growth auxiliary agent
With.Charcoal is alkalescence, can regulate the pH of acid ground, reduces transfer ability and the activity of heavy metal.
Additionally, be applied to charcoal in farmland to slow down CO2Discharge, alleviate greenhouse effects, increase soil
Carbon fixing efficiency and carbon base in soil total amount.
3, the present invention first carries out phytoremediation according to concrete soil pollution situation and heavy metal available state ratio,
Reduction heavy metal content in soil, then carry out the passivation of heavy metal, reduce the biological effectiveness of heavy metal, and
Regulate charcoal and the amount of application of fertilizer according to actual pollution situation and effect of plant restoration, improve soil
Heavy metal repairing effect, reduces cost.
4, utilize organic waste to prepare charcoal and improve the phytoremediation of heavy metal, both can realize agricultural
The recycling of discarded object, develops eco-agriculture, and can reduce again the agricultural organic wastes such as stalk
Open incineration, promotes the Natural Circulation of farmland nutrient.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further analyzed.
Embodiment 1
In the present embodiment, rye grass is English ryegrass；Charcoal be bamboo surplus material of processing, stalk,
The agricultural organic wastes such as rice husk produce through 500～700 DEG C of solids arrived being pyrolyzed carbonizations under conditions of anoxic
Thing, pulverizes with pulverizer, crosses 20 mesh sieves and prepares.PH=10.47, TC are that 255.80g/kg, DOC are
0.88g/kg, TN are 1.48g/kg；Fertilizer is pig manure and rice husk compost, the green precious fertilizer in Hangzhou have
Limit company produces.PH=7.30, TC be 243.30g/kg, DOC be 3.57g/kg, TN be 2.61g/kg.
Soil takes from Zhejiang Hangzhou Fuyang acid red loam.Pedotheque air-dries after adopting back, makes dough with wooden
The ground 6mm of cane sieves.After testing, this examination Copper In The Soil, cadmium content are higher than " soil environment quality mark
Quasi-GB15618-2008 " secondary standard 1.34～3.68, Nemerow Index is respectively 0.74 and 1.02,
Available state proportion is 21.29～28.35.Plantation rye grass, carries out pot experiment.Flowerpot diameter
For 12cm, rye grass application rate is 40g/m2, i.e. 0.45g/ basin, when rye grass is highly more than 25 centimetres
Rear results.After testing, now this examination Copper In The Soil, cadmium content meet " standard of soil environment quality
GB15618-2008 " secondary standard, Nemerow Index be less than 0.7, available state proportion be 19.32～
24.13.Respectively the fertilizer of 0g, 30g, 60g is mixed with 600g soil and (process numbering to be respectively
1-0F, 1-5F, 1-10F), plant capsicum, arrange the soil do not repaired through rye grass is comparison simultaneously
(1-CK).During capsicum results, the content of the heavy metal copper in soil, capsicum, cadmium is measured, meter
Calculate reduced rate and the content of Absorption By Hot Pepper Plant heavy metal of heavy metal in soil content, be shown in Table 1.
Table 1 respectively processes heavy metal in soil content slip and the content of Absorption By Hot Pepper Plant heavy metal
Embodiment 2
Soil takes from the acid mountain region moisture soil in Zhejiang Hangzhou Linan, and other material used is with example 1..Soil
Sample air-dries after adopting back, sieves with the ground 6mm of wooden rolling pin.After testing, this examination Lead In Soil,
Chromium, cadmium content are higher than " standard of soil environment quality GB15618-2008 " secondary standard 7.13～9.02
, Nemerow Index is respectively 1.03,0.73,1.09, and available state proportion is 22.39～27.75
?.Plantation rye grass, carries out pot experiment.The a diameter of 12cm of flowerpot, rye grass application rate is 40g/m2,
I.e. 0.45g/ basin, gathers in the crops after rye grass is highly more than 25 centimetres.After testing, now in this examination soil
Lead, chromium, cadmium content meet " standard of soil environment quality GB15618-2008 " secondary standard, but lead and
The Nemerow Index of cadmium more than 0.7, respectively 0.72 and 0.89, available state proportion be 23.45～
25.57.Respectively the fertilizer of 0g, 30g, 60g is mixed with charcoal and the 600g soil of 6g (place
Reason numbering is respectively 2-0F, 2-5F, 2-10F), plant green vegetables, arrange simultaneously and do not repair through rye grass
Soil for comparison (2-CK).During green vegetables results, to heavy metal lead in soil, green vegetables, chromium, cadmium
Content is measured, and the reduced rate and the green vegetables that calculate heavy metal in soil content absorb containing of heavy metal
Amount, is shown in Table 2.
Table 2 respectively processes heavy metal in soil content slip and the content of green vegetables absorption heavy metal
Embodiment 3
Soil takes from Zhejiang Hangzhou Jiande acidity mountain red earth soil, and other material used is with example 1.Soil-like
Product air-dry after adopting back, sieve with the ground 6mm of wooden rolling pin.After testing, this examination Lead In Soil, cadmium
Content is higher than " standard of soil environment quality GB15618-2008 " secondary standard 7.75～19.26, Buddhist nun
Plum sieve index is respectively 0.77 and 1.73, and available state proportion is 25.42～46.72.Plant black
Wheat straw, rye grass application rate is 40g/m2, i.e. 0.45g/ basin, receive after rye grass is highly more than 25 centimetres
Obtain.After testing, now this examination Lead In Soil, cadmium content remain above " standard of soil environment quality
GB15618-2008 " secondary standard, measure heavy metal in soil lead, the bound residue content of cadmium, calculate
The 17.59～32.87 of tenor must be accounted for.Respectively by the life of the fertilizer of 0g, 30g, 60g Yu 12g
Thing charcoal and 600g soil mixing (process numbering and be respectively 3-0F, 3-5F, 3-10F), plant kidney bean,
Arrange the soil do not repaired through rye grass is comparison (3-CK) simultaneously.Kidney bean results time, to soil,
Heavy metal lead in kidney bean, the content of cadmium are measured, calculate heavy metal in soil content reduced rate,
And kidney bean absorbs the content of heavy metal, it is shown in Table 3.
Table 3 respectively processes heavy metal in soil content slip and the content of kidney bean absorption heavy metal
Embodiment 4
Soil takes from the livid purple mud of acidity of the good small piece of land surrounded by water of Zhejiang Hangzhou, and other material used is with example 1.Pedotheque
Air-dry after adopting back, sieve with the ground 6mm of wooden rolling pin.After testing, this examination Chromium in Soil, cadmium contain
Amount is higher than " standard of soil environment quality GB15618-2008 " secondary standard 13.75～20.92, Buddhist nun plum
Sieve index is respectively 1.17 and 1.29, and available state proportion is 31.84～55.16.Plantation rye
Grass, rye grass application rate is 40g/m2, i.e. 0.45g/ basin, gather in the crops after rye grass is highly more than 25 centimetres.
After testing, now this examination Lead In Soil, chromium, cadmium content remain above " standard of soil environment quality
GB15618-2008 " secondary standard, measure heavy metal in soil lead, chromium, the bound residue content of cadmium,
Calculate and account for the 16.33～41.25 of tenor.Respectively by fertilizer and the 18g of 0g, 30g, 60g
Charcoal and 600g soil mixing (process numbering be respectively 4-0F, 4-5F, 4-10F), plant tomato,
Arrange the soil do not repaired through rye grass is comparison (4-CK) simultaneously.Tomato results time, to soil, kind
Heavy metal chromium in eggplant, the content of cadmium are measured, calculate heavy metal in soil content reduced rate, with
And tomato absorbs the content of heavy metal, it is shown in Table 4.
Table 4 respectively processes heavy metal in soil content slip and the content of tomato absorption heavy metal
Embodiment 5
Soil takes from the neutral silt of Zhejiang Hangzhou Xiaoshan, and other material used is with example 1.Pedotheque
Air-dry after adopting back, sieve with the ground 6mm of wooden rolling pin.After testing, this examination Lead In Soil, arsenic contain
Amount is higher than " standard of soil environment quality GB15618-2008 " secondary standard 15.24～26.37, Buddhist nun plum
Sieve index is respectively 1.32 and 1.48, and available state proportion is 41.59～55.37.Plantation rye
Grass, rye grass application rate is 40g/m2, i.e. 0.45g/ basin, gather in the crops after rye grass is highly more than 25 centimetres.
After testing, now this examination Lead In Soil, arsenic content remain above " standard of soil environment quality
GB15618-2008 " secondary standard, measure heavy metal in soil lead, the bound residue content of arsenic, calculate
The 45.02～54.63 of tenor must be accounted for.Respectively by the life of the fertilizer of 0g, 30g, 60g Yu 24g
Thing charcoal and 600g soil mixing (process numbering and be respectively 5-0F, 5-5F, 5-10F), plant eggplant, with
Time to arrange the soil not do not repaired through rye grass be comparison (5-CK).During eggplant results, to soil, eggplant
In heavy metal lead, the content of arsenic be measured, calculate heavy metal in soil content reduced rate and
Eggplant absorbs the content of heavy metal, is shown in Table 5.
Table 5 respectively processes heavy metal in soil content slip and the content of eggplant absorption heavy metal
Embodiment 6
Soil takes from the neutral silt loam of Zhejiang Hangzhou Qiaosi, and other material used is with example 1.Soil-like
Product air-dry after adopting back, sieve with the ground 6mm of wooden rolling pin.After testing, this examination Arsenic in Soil, cadmium
Content is higher than " standard of soil environment quality GB15618-2008 " secondary standard 18.52～24.45, Buddhist nun
Plum sieve index is respectively 1.67 and 1.89, and available state proportion is 24.45～59.37.Plant black
Wheat straw, rye grass application rate is 40g/m2, i.e. 0.45g/ basin, receive after rye grass is highly more than 25 centimetres
Obtain.After testing, now this examination Arsenic in Soil, cadmium content remain above " standard of soil environment quality
GB15618-2008 " secondary standard, measure heavy metal in soil arsenic, the bound residue content of cadmium, calculate
The 46.72～56.46 of tenor must be accounted for.Respectively by the life of the fertilizer of 0g, 30g, 60g Yu 30g
Thing charcoal and 600g soil mixing (process numbering and be respectively 6-0F, 6-5F, 6-10F), plant water spinach,
Arrange the soil do not repaired through rye grass is comparison (6-CK) simultaneously.Water spinach results time, to soil,
Heavy metal arsenic in water spinach, the content of cadmium are measured, calculate heavy metal in soil content reduced rate,
And water spinach absorbs the content of heavy metal, it is shown in Table 6.
Table 6 respectively processes heavy metal in soil content slip and the content of water spinach absorption heavy metal
Claims (2)
1. the method for the micro-pollution of restoration facilities Heavy Metal in Vegetable Farm Soil, it is characterised in that the method comprises the following steps:
Step (1), the content of beary metal measured in contaminated soil to be repaired, unit is mg/kg, it is judged that whether this soil is the micro-contaminated soil of heavy metal, if being then applicable to the method, if not otherwise being suitable for the method；
Step (1) judge contaminated soil to be repaired be whether the standard of the micro-contaminated soil of heavy metal be to judge that whether contaminated soil Nemerow Index to be repaired is between 0.7～2；
Described heavy metal pollution of soil Nemerow Index be can be calculated by formula (1):
P=[(Pmax2+Pave2)/2]1/2 (1)
In formula, Pmax is (Pi) max, for the maximum of monomial pollution exponent Pi；Pave is (Pi) ave, for the arithmetic mean of instantaneous value of monomial pollution exponent Pi；
Described monomial pollution exponent Pi be can be calculated by formula (2):
Pi=Ci/Si (2)
In formula, monomial pollution exponent Pi is the environmental quality index of pollutant in soil i；Ci is the measured concentration of pollutant in soil i, and unit is mg/kg；S is the two-level appraisement standard of pollutant i, and unit is that mg/kg can refer to " standard of soil environment quality GB15618-2008 "；
Step (2), the to be repaired micro-contaminated soil chosen step (1) by planting rye grass carry out phytoremediation, reduce the content of beary metal in micro-contaminated soil to be repaired；
The application rate of described rye grass is more than or equal to 40g/m2；
Step (3), when rye grass highly more than or equal to 25 centimetres time, can gather in；
The rye grass of results is different according to its content of beary metal, does herbage and uses or ashing landfill；
Step (4), mensuration micro-Heavy Metals in Contaminated Soils content to be repaired and heavy metal bio-available Zn concentration after above-mentioned steps (3) rye grass is gathered in, and calculated its heavy metal pollution of soil Nemerow Index by formula (1)；Then the secondary standard that judges whether heavy metal content in soil exceedes " standard of soil environment quality GB15618-2008 ", if otherwise carrying out step (5), if then carrying out step (6)；
Described heavy metal bio-available Zn concentration includes that exchangeable species, carbonate combine state, Fe-Mn oxide and combination state；
Step (5) is if heavy metal content in soil is less than " standard of soil environment quality GB15618-2008 " secondary standard, then judge heavy metal-polluted soil Nemerow Index whether more than 0.7, if carrying out step (7) after otherwise directly micro-contaminated soil to be repaired applying fertilizer after above-mentioned steps (3) rye grass is gathered in；If then applying fertilizer before planting vegetable after above-mentioned steps (3) rye grass is gathered in micro-contaminated soil to be repaired is the charcoal that dry ground weighs 1 with amount of application, reduce the biological effectiveness of covered soil heavy metal in soil, finally carry out step (7)；
Step (6) is if heavy metal content in soil exceedes " standard of soil environment quality GB15618-2008 " secondary standard, then judge that whether heavy metal available state is higher than the 45 of content of beary metal, if then micro-contaminated soil to be repaired applying fertilizer and charcoal after above-mentioned steps (3) rye grass is gathered in before planting vegetable, the amount of application of charcoal is more than the 3 of dry ground weight, and less than or equal to the 5 of dry ground weight, reduce the biological effectiveness of covered soil heavy metal in soil, finally carry out step (7)；If otherwise micro-contaminated soil to be repaired applying fertilizer and charcoal after above-mentioned steps (3) rye grass is gathered in before planting vegetable, the amount of application of charcoal weighs 1 more than dry ground, and less than or equal to the 3 of dry ground weight, reduce the biological effectiveness of covered soil heavy metal in soil, finally carry out step (7)；
Step (7), general planting vegetables；
Charcoal described in step (5), (6) is the solid product that agricultural organic waste obtains through 500～700 DEG C of pyrolysis carbonizations under conditions of anoxic, pulverizes with pulverizer, crosses 20 mesh sieves and prepares.
The method of a kind of micro-pollution of restoration facilities Heavy Metal in Vegetable Farm Soil the most as claimed in claim 1, it is characterised in that agricultural organic waste is mixed by bamboo surplus material of processing, stalk, rice husk.
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| CN110026417A (en) * | 2019-03-29 | 2019-07-19 | 北京建工环境修复股份有限公司 | A kind of restorative procedure in heavy metal pollution arable land |
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