CN107583942A - A kind of method for reducing heavy-metal composite pollution geobiont validity - Google Patents
A kind of method for reducing heavy-metal composite pollution geobiont validity Download PDFInfo
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Abstract
The invention discloses a kind of method for reducing heavy-metal composite pollution geobiont validity, comprise the following steps：After the soil of heavy-metal composite pollution is air-dried, sieving preserves；Using agriculture and forestry organic waste material as raw material, prepare charcoal particle, and crush, screen after air-dry or drying preserve；Drying charcoal particle after screening and combined contamination soil are pressed 1:20~1:100 weight ratios are stirred, and adding distilled water makes its water content reach the 50~70% of field capacity, are placed and are allowed within 5~7 days it fully decomposed, the charcoal earth mixtures of heavy-metal composite pollution is made；Tobacco seedlings are transplanted into above-mentioned charcoal earth mixtures using well cellar for storing things formula young seedling transplanting method, while Jing Jiao is uniformly filled with the mixture, keep tobacco seedling growth point exposed.The present invention significantly reduces heavy-metal composite pollution soil Cd and Pb bio-available Zn concentration, while is significantly reduced root of the crop, stem, leaf heavy metal Cd and Pb absorption and enrichment；Cost of the present invention is low, and efficiency high is simple to operate, application easy to spread.
Description
Technical field
The invention belongs to remediation contaminated soil technical field, and in particular to one kind reduces heavy metal using tobacco rod charcoal and answered
The method for closing contaminated soil biological effectiveness.
Background technology
In recent years, with industry, the aggravation of municipal pollution, the increase of agrochemicals type and quantity, vehicle exhaust
And the continuous discharge of house refuse, heavy metal pollution of soil getting worse, it has also become restrict the key issue of sustainable development.Soil
Heavy metal can enter crop by all means in earth, and by food chain transmission, and then be enriched with human body, make one to produce
Anaemia, amentia, metabolic disorder, in addition it is carcinogenic etc., great threat is produced to the health of the mankind.At present, some vegetables of China
Dish, grain and tobacco planting area just suffer from grave danger of heavy metal pollution, and flue-cured tobacco heavy metals exceeding standard event is of common occurrence.Grind
Study carefully and how to purify vega soil, reducing heavy metal-polluted soil bio-available Zn concentration and its being accumulated in flue-cured tobacco more and more turns into both domestic and external
Scientific research focus.At present, the administering method of heavy metal contaminated soil mainly has:Physical engineering method, bioanalysis and chemical method etc..To the greatest extent
Managing these methods has certain improved effect, but certain limitation all be present.Such as it is costly, efficiency is low, soil texture is broken
Outside, nutrient loss is serious and underground water pollution etc..
Charcoal (Biochar) is to be lacked with biomass (agriculture and forestry organic waste material, animal skeleton and excreta) for raw material in high temperature
A kind of solid matter high containing carbon rich, porosity for being pyrolyzed and preparing under the conditions of oxygen.Because charcoal has loose structure, table
Face functional group is enriched, and this causes it to have stronger adsorption capacity, and the reparation with preferable agricultural benefit and soil pollution is dived
Power.Research shows that charcoal administration, which can dramatically increase the fixing effect of heavy metal-polluted soil and reduce it, enters human foods chain
Risk, this is mainly due to charcoal and possesses bigger specific surface area, microcellular structure, active organo-functional group and height
CEC and pH.Wherein, pH is an important factor for controlling soil physical chemistry reaction and surface charge.High pH soil is recognized
For with stronger alkalescence, can by precipitate and adsorb (electrostatic and obligate absorption) process strengthen the absorption of its heavy metal with
Fixing.Up to now, it is raw though heavy metal mobility and validity can be reduced in acid soil by having research to have proven to charcoal
Influence of the thing charcoal to rendzinas bioavailability of heavy metals is also rarely reported.It is generally believed that charcoal is to acid soil, exchangeability
The influence of acidity, the point of zero net charge, specific surface area and CEC is significantly stronger than rendzinas, and above-mentioned property directly determines weight
Fractions distribution of the metal in soil and Transport And Transformation process.Therefore, charcoal heavy metal combined contamination soil (particularly stone
Dirt) larger uncertainty also be present in the influence of biological effectiveness.
China is the country that agricultural wastes output is maximum in the world, and the quantum of output of annual agricultural crop straw is about
600000000 t, wherein tobacco rod average annual yield are up to 150~1,700,000 t.At present, peasant household is general all for tobacco rod offal treatment
The mode for directly taking field to burn, the process not only results in air pollution, and health can be impacted.Cause
This, the comprehensive utilization of tobacco rod is by more and more extensive concern.If above-mentioned discarded tobacco rod is added under the conditions of high temperature
Work is prepared into charcoal, then returning to the field in some way, not only takes full advantage of agricultural wastes resource, and can also repair
Soil pollution, improve soil and crop safety, had broad application prospects in agriculture field, be it is a kind of turn waste into wealth it is new
Approach.
The content of the invention
It is effective using tobacco rod charcoal reduction heavy-metal composite pollution geobiont it is an object of the invention to provide one kind
Property method, not only there is the function of fixing heavy metal-polluted soil in situ, and soil texture, increase soil nutrient member can also be improved
Element, have the function of repairing and reduce crop Heavy Metal Accumulation concurrently.
To solve above technical problem, technical scheme comprises the following specific steps that：
1) after the soil of heavy-metal composite pollution is air-dried, sieving preserves；
2) using agriculture and forestry organic waste material as raw material, particulate biomass is obtained after preliminary working, is carbonized through retort, is prepared
Charcoal；
3) charcoal particle crushed, air-dried after screening or dry preservation；
4) combined contamination soil for obtaining the drying charcoal particle after screening and step 1) is by 1:20~1:100 weight
Than being stirred, charcoal is set to precipitate and be uniformly distributed completely in soil, and adding distilled water makes its water content reach field
The 50~70% of water-holding capacity, then place 5~7 days, make it fully decomposed, the charcoal earth mixtures of heavy-metal composite pollution is made simultaneously
Encapsulation preserves；
5) tobacco seedlings are transplanted in the charcoal earth mixtures obtained to step 4) using well cellar for storing things formula young seedling transplanting method, well cellar for storing things depth
For 5~7cm, while Jing Jiao is uniformly filled with above-mentioned charcoal earth mixtures, and be filled to well head, keep tobacco seedling growth point exposed.
Wherein, the pollutant of heavy-metal composite pollution soil is in step 1)：Cadmium (Cd), mercury (Hg), silver-colored (Ag), copper
(Cu), two or more of barium (Ba), lead (Pb), chromium (Cr) and arsenic (As).Soil types is yellow earth, red soil, palm fibre in step 1)
Earth, cinnamon soil, black earth, chestnut soil, desert soil, moisture soil, anthropogenic-alluvial soil, rice soil, the one or more of purple soil and rendzinas.It is preferred that soil
Earth type is rendzinas.Lime radii of soil particles≤2mm of use.
Agriculture and forestry organic waste material is tobacco rod, maize straw, rape stalk, rice straw, rice husk, wood chip, Chinese medicine in step 2)
One or more in slag, peanut shell.It is preferred that agriculture and forestry organic waste material is tobacco rod.Agricultural are discarded during the preparation of charcoal in step 2)
Thing dries by removal of impurities, concentration and air-dries and crush successively, obtains dry particulate biomass raw material；Then combined type is used
A kind of biological particles retort (as disclosed in Chinese patent literature Application No. ZL201110073104.1 patent of invention charcoal
Change stove) carbonized, material is supplemented to control oxygen supply by way of each feed supplement thickness is 10-20cm in carbonization process
Amount, so as to which carbonization temperature at 250-450 DEG C or so, finally realizes that retort endogenous substance carbonizes completely in holding furnace.It is preferred that mend
Material thickness is 20cm, and carbonization temperature is 450 DEG C.
In step 3) during charcoal particle screen selecting, select particle diameter≤1mm charcoals particle and mixed with combined contamination soil particle
Close uniform.
In step 4), distilled water makes that charcoal earth mixtures water content is field capacity 50% is preferably added, and it is fully rotten
Ripe 7 days.
The invention has the advantages that using biomass cracking technical finesse crops tobacco rod, then returning to the field by a certain percentage, no
But heavy metal bio-available Zn concentration in combined contamination soil can be reduced, and can also reduce migration of the heavy metal in cigarette strain body with
Enrichment.Tobacco rod charcoal can be used as heavy metal contaminated soil conditioner, and and can is environmentally friendly as purification metallic wastewater
Sorbing material.The present invention significantly reduces the biological effectiveness of combined contamination soil heavy metal using tobacco rod charcoal, also simultaneously
Soil nutrient elements content is significantly increased, realizes the Fertilizer Transformed and recycling of the agricultural wastes such as tobacco rod, Quan Mianti
High quality of tobacco and security.
The present invention also has the advantages that：
Charcoal used in the present invention, its preparation technology is simple, is easy to industrialized production, utilizes tobacco rod, maize straw, water
The agricultural such as rice straw, wood chip, Chinese medicine slag, peanut shell abandoned biomass is raw material, and cost is cheap, and raw material abundance is easy to get, for
Protect Ecological Environment significant.
Charcoal used in the present invention, there is loose porous feature, specific surface area is big, surface energy is high, and surface functional group is rich
Richness, there is very strong cation exchange amount (CEC) ability, these features, which constitute charcoal, has good characterization of adsorption, improves
Adsorption capacity of the charcoal to combined contamination soil heavy metal, so as to reach the mesh that bioavailability of heavy metals is reduced on source
's.Compared with the control for being not added with charcoal, (DTPA soaks bio-available Zn concentration of the tobacco rod charcoal to Cd in combined contamination soil
Carrying) reduced rate is 6.37-10.38%, tobacco rod charcoal is to the bio-available Zn concentration reduced rate of Pb in combined contamination soil：
3.28-13.5%.Meanwhile charcoal also has good effect for reducing heavy-metal residual in tobacco plants.Such as tobacco rod
Charcoal is respectively to the reduced rate of Cd contents in flue-cured tobacco root, stem and leaf：2.48-14.59%, 6.52-23.12% and 23.71-
38.83%；Tobacco rod charcoal is respectively to the content reduced rate of Pb in flue-cured tobacco root, stem and leaf：3.47-31.81%, 13.98-
33.19% and 4.47-60.28%；Effect is clearly.In addition, charcoal can also reduce the concentration coefficient of flue-cured tobacco heavy metal,
Advantageously ensure that the security production of tobacco leaf.Such as：Compared with the control, enrichment of the tobacco rod charcoal to flue-cured tobacco root, stem and leaf Cd
Coefficient reduced rate is respectively：3.36-12.61%, 5.88-21.18%, 24.35-37.01%, tobacco rod charcoal to flue-cured tobacco root,
Stem and leaf Pb concentration coefficient reduced rate is respectively：5.70-27.68%, 14.29-28.57% and 4.84-58.06%.
The method cost of the present invention is low, and efficiency high, environmental risk is low, will not produce secondary pollution, is advantageous to weight in soil
The fixation of metal.Meanwhile practical application of the present invention is high, operating process is simple and easily training, peasant can grasp, can be in rural area
Regional large-scale popularization application, there are preferable market prospects.
Brief description of the drawings
Fig. 1 is reducing effect of the different proportion charcoal addition to rendzinas heavy metal bio-available Zn concentration of embodiment 2
(a, b are different, and letter represents significant difference (P between different disposal<0.05)；Difference does not show between same letter represents different disposal
Write (P>0.05))；
Fig. 2 is different proportion charcoal addition reducing effect (a, b, c to each organ Cd contents of flue-cured tobacco of embodiment 3
Different letters represent significant difference (P between different disposal<0.05)；Same letter represents the not notable (P of difference between different disposal
>0.05))；
Fig. 3 is that (a, b are or not reducing effect of the different proportion charcoal addition of embodiment 4 to each organ Pb contents of flue-cured tobacco
With significant difference (P between letter expression different disposal<0.05)；Same letter represents the not notable (P of difference between different disposal>
0.05))。
Embodiment
Below in conjunction with the embodiment of the present invention, technical scheme is clearly and completely described.Obviously, institute
The embodiment of description is only part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention,
The every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, belongs to this hair
The scope of bright protection.
Embodiment 1：
Tobacco is one of the Important Economic crop in China, and cultivated area and yield rank first in the world, per annual planting area
About 1,400,000 hm2, yield of tobacco is up to 150~1,700,000 t, while also will correspondingly t tobacco rods of output about 150~1,700,000.Tobacco rod was both
It is not suitable for making fuel, is also not suitable for direct returning to farmland and makees fertilizer, a large amount of tobacco rods is dropped or burned, and vega can not only grown a large amount of
Germ, but also can seriously pollute atmospheric environment.Therefore, strengthen the comprehensive utilization of resources to agricultural wastes such as tobacco rods not only may be used
Effectively to handle above-mentioned discarded object, turn waste into wealth, and the income of tobacco grower can also be improved, can so as to realize tobacco
Sustainable development.
The phenomenon that a large amount of tobacco rods are dropped be present for cigarette district, the present invention is in Guizhou Province Tabacco Science and Technology Institute dragon hilllock scientific research
Implement proving ground.After base tobacco rod is collected, drying is concentrated to air-dry.Tobacco rod is crushed to by 1cm or so using hay cutter, works as tobacco powder
During Han Shui Liang≤15%, carbonized using combined bio matter granule carbonization furnace (patent No. ZL201110073104.1).Tool
Body operating process is：Graininess tobacco rod is fitted into body of heater, initial charge is advisable with covering 20-30cm on burner, uses bavin
Ignition substance in the combustibles ignition burner flashpan such as oil.After material is ignited, self-sustaining combustion, without external heat source.Adopt
Furnace body temperature monitoring is carried out with XMT-121 types digital temperature controller, controls tobacco rod biomass anoxic under 450 DEG C of sub- hot conditions
Charing, and Material control oxygen supply amount is supplemented in time.Additional material thickness is about 10-20cm, feed time interval 1h every time,
After the superiors' biomass carbonizes completely, cool down come out of the stove after spray cold water extinguishing stove fire in time.
After above-mentioned tobacco rod charcoal particle natural air drying, crushing and processing are carried out, are screened by≤1mm particle diameter.
The rendzinases of Cd and Pb combined pollutions is screened through air-drying, by≤2mm particle diameter.
Charcoal particle after screening and combined pollution lime soil particle are pressed 1:100,1:40 and 1:The ratio mixing of 20 weight,
It is sufficiently stirred, is prepared into the charcoal earth mixtures of Cd and Pb combined pollutions.After finally filling basin according to 15kg/ basins, it is small that formula is stored using well
Method for transplanting carries out tobacco seedlings transplanting, is flue-cured tobacco K326 for examination tobacco bred.This experiment sets three charcoal fertilizing standards altogether,
And a control (not plus charcoal) is set, often processing is to repeat three times.
The present invention reduces the heavy metal being related in rendzinas in the method for heavy metal bio-available Zn concentration using tobacco rod charcoal
(Cd and Pb) qualitative and quantitative analysis is surveyed using atomic absorption spectrography (AAS) (Atomic Absorption Spectroscopy, AAS)
It is fixed.Wherein, the total Cd and Pb contents of soil use HNO3-H2SO4-HClO4Resolution, soil Cd and Pb bio-available Zn concentration use DTPA
Extract (pH 7.3) (0.005M DTPA, 0.01M CaCl2And 0.1M TEA), each organ Cd of plant and Pb contents use
HNO3-HClO4Resolution, last leaching liquor or digestion solution are determined using AAS.
The present invention improves the increment rate calculation formula being related in the method for rendzinas nutritive element content using charcoal such as
Under：
Wherein, C1Different proportion charcoal is represented using nutritive element content (g kg in preceding rendzinas-1), C2Represent biology
Charcoal applies nutritive element content (g kg in rear rendzinas-1)。
The present invention reduces the reduced rate being related in rendzinas heavy metal Cd and the method for Pb bio-available Zn concentrations using charcoal
Calculation formula is as follows：
Wherein, C1Represent Cd and Pb contents (the mg kg that charcoal applies preceding soil DTPA extractions-1), C2Represent not year-on-year
Example charcoal applies Cd and Pb contents (the mg kg of rear soil DTPA extractions-1)。
The present invention is reduced the reduced rate being related in the method for flue-cured tobacco heavy metal Cd and Pb residual quantities using charcoal and calculates public affairs
Formula is as follows：
Wherein, C1Charcoal is represented using Cd and Pb contents (mg kg in preceding flue-cured tobacco root, stem and leaf-1), C2Represent not year-on-year
Example charcoal is using Cd and Pb contents (mg kg in rear flue-cured tobacco root, stem and leaf-1)。
Heavy metal Cd and Pb concentration coefficient (BAF) are plant uptake and accumulation heavy metal Cd and Pb abilities from soil.
BAF=CPlant/CSoil
Wherein, CPlant:Each organ heavy metal Cd of plant and Pb contents (mg kg-1),CSoil:Heavy metal-polluted soil Cd and Pb content
(mg kg-1)。
Charcoal applies the lifting effect of heavy metal combined pollution rendzinas nutrient：
Organic matter, total nitrogen, total phosphorus and effective potassium content are respectively in former rendzinas：46.47g kg-1, 1.89g kg-1,
0.94g kg-1, 350.82mg kg-1.As shown in Table 1, it is organic can significantly to lift soil after high temperature pyrolysis is handled for tobacco rod
The nutritive element contents such as matter, total nitrogen, total phosphorus and effective potassium, significant effect.When charcoal and combined pollution (Cd and Pb) soil weight
Measuring ratio is respectively：1:100、1:40 and 1:When 20, content of organic matter increment rate is respectively in rendzinas：2.34%th, 16.72% and
102.73%；Total nitrogen content increment rate is respectively：4.23%, 12.70% and 27.51%；Total phosphorus content increment rate is respectively：
1.06%, 5.32% and 20.21%；Effective potassium content increment rate is respectively：78.12%, 183.73% and 458.55%.Cause
This, compared with compareing (not applying charcoal), addition different proportion tobacco rod charcoal significantly improves nutrient in rendzinas and contained
Amount.
The influence of the tobacco rod charcoal different administration ratio heavy metal combined pollution rendzinas nutrient of table 1
Same column a, b, c are different, and letter represents significant difference (P between different disposal<0.05), same letter represents not exist together
Not notable (the P of difference between reason>0.05) (one-way analysis of variance, LSD multiple comparison graphs, α=0.05).
Embodiment 2：Charcoal applies the reducing effect to rendzinas heavy metal (Cd and Pb) bio-available Zn concentration：
In rendzinas, heavy metal-polluted soil concentration that heavy metal-polluted soil bio-available Zn concentration is typically leached out by DTPA come
Represent.With the increase of charcoal amount of application, Cd and Pb heavy metals bio-available Zn concentration gradually reduces in rendzinas.When charcoal with
Combined pollution (Cd and Pb) soil weight ratio is respectively：1:100、1:40 and 1:When 20, the Cd available state reduced rates in rendzinas
Respectively：6.37%th, 6.84% and 10.38%；Pb available states reduced rate is respectively in rendzinas：3.28%th, 9.20% and
13.55%.Compared with compareing (not applying charcoal), when charcoal amount of application reaches 1:When 20 (charcoal/native weight ratio), soil Cd available states
Content significantly reduces (P ＜ 0.05).Meanwhile when charcoal amount of application reaches 1:40 and 1:When 20, P in soil b bio-available Zn concentrations with
Difference is notable (P ＜ 0.05) between compareing (not applying charcoal).Therefore, using tobacco rod charcoal to Cd and Pb combined contamination soils
In, significantly reduce the bio-available Zn concentration (as shown in Figure 1) of Cd and Pb in rendzinas.
Embodiment 3, charcoal apply the reducing effect to each organ Cd residual quantities of flue-cured tobacco：
With the increase of charcoal amount of application, each organ Cd of flue-cured tobacco (K326) residual quantity gradually reduces.When charcoal with
Combined pollution (Cd and Pb) soil weight ratio is respectively：1:100、1:40 and 1:When 20, Cd residual quantities reduced rate in flue-cured tobacco root system
Respectively：2.48%th, 4.04% and 14.59%；Cd residual quantities reduced rate is respectively in flue-cured tobacco stem：15.51%th, 6.52% and
23.12%；Cd residual quantities reduced rate is respectively in flue-cured tobacco：23.71%th, 29.84% and 38.83%.With compareing and (not applying charcoal)
Compare, when charcoal amount of application reaches 1:When 20 (charcoal/native weight ratio), Cd residual quantities significantly reduce (P in flue-cured tobacco<0.05).
Meanwhile there is also significant difference (P between applying charcoal and not applying charcoal processing for Cd residual quantities in flue-cured tobacco stem<0.05).Therefore, using cigarette
Bar charcoal significantly reduces plant heavy metal Cd absorption (as shown in Figure 2) into Cd and Pb combined pollution rendzinases.
Embodiment 4, charcoal apply the reducing effect to each organ Pb residual quantities of flue-cured tobacco：
With the increase of charcoal amount of application, each organ Pb of flue-cured tobacco (K326) residual quantity gradually reduces.When charcoal with
Combined pollution (Cd and Pb) soil weight ratio is respectively：1:100、1:40 and 1:When 20, Pb residual quantities reduced rate in flue-cured tobacco root system
Respectively：3.47%th, 7.26% and 31.81%；Pb residual quantities reduced rate is respectively in flue-cured tobacco stem：13.98%th, 16.13% and
33.19%；Pb residual quantities reduced rate is respectively in flue-cured tobacco：4.47%th, 37.80% and 60.28%.With compareing and (not applying charcoal) phase
Than when charcoal amount of application reaches 1:When 20 (charcoal/native weight ratio), Pb residual quantity significantly reduces (P in flue-cured tobacco and root<
0.05).Therefore, using tobacco rod charcoal into Cd and Pb combined pollution rendzinases, significantly reduce plant heavy metal Pb's
Absorb (as shown in Figure 3).
Embodiment 5, charcoal apply the reducing effect to each organ Cd concentration coefficients of flue-cured tobacco：
With the increase of charcoal amount of application, each organ Cd of flue-cured tobacco (K326) concentration coefficient (BAFCd) gradually reduce.When
Charcoal is respectively with combined pollution (Cd and Pb) soil weight ratio：1:100、1:40 and 1:When 20, BAF in flue-cured tobacco root systemCdDrop
Low rate is respectively：3.36%th, 3.36% and 12.61%；BAF in flue-cured tobacco stemCdReduced rate is respectively：16.47%th, 5.88% and
21.18%；BAF in flue-cured tobaccoCdReduced rate is respectively：24.35%th, 29.22% and 37.01%.Compared with compareing (not applying charcoal),
When charcoal amount of application reaches 1:When 20 (charcoal/native weight ratio), BAF in flue-cured tobacco and stemCdSignificantly reduce (P<0.05).Cause
This, using tobacco rod charcoal into Cd and Pb combined pollution rendzinases, significantly reduces plant heavy metal Cd enrichment and moves
Move (table 2).
The tobacco rod charcoal different administration ratio of table 2 is to flue-cured tobacco Cd concentration coefficients (BAFCd) influence
Same column a, b are different, and letter represents significant difference (P between different disposal<0.05), same letter represents different disposal
Between difference not significantly (P>0.05) (one-way analysis of variance, LSD multiple comparison graphs, α=0.05).
Embodiment 6, charcoal apply the reducing effect to each organ heavy metal Pb concentration coefficient of flue-cured tobacco：
With the increase of charcoal amount of application, each organ Pb of flue-cured tobacco (K326) concentration coefficient (BAFPb) gradually reduce.When
Charcoal is respectively with combined pollution (Cd and Pb) soil weight ratio：1:100、1:40 and 1:When 20, BAF in flue-cured tobacco root systemPbDrop
Low rate is respectively：5.70%th, 6.82% and 27.68%；BAF in flue-cured tobacco stemPbReduced rate is respectively：14.29%th, 14.29% and
28.57%；BAF in flue-cured tobaccoPbReduced rate is respectively：4.84%th, 35.48% and 58.06%.Compared with compareing (not applying charcoal),
When charcoal amount of application reaches 1:When 20 (charcoal/native weight ratio), BAF in flue-cured tobacco and rootPbSignificantly reduce (P<0.05).Cause
This, using tobacco rod charcoal into Cd and Pb combined pollution rendzinases, significantly reduces plant heavy metal Pb enrichment with moving
Move (table 3).
The tobacco rod charcoal different administration ratio of table 3 is to flue-cured tobacco Pb concentration coefficients (BAFCd×10-2) influence
Same column a, b are different, and letter represents significant difference (P between different disposal<0.05), same letter represents different disposal
Between difference not significantly (P>0.05) (one-way analysis of variance, LSD multiple comparison graphs, α=0.05).
Certainly, the above is the concrete application example of the present invention, and the present invention also has other embodiments, all using equivalent
The technical scheme that replacement or equivalent transformation are formed, all falls within protection domain of the presently claimed invention.
Claims (7)
- A kind of 1. method for reducing heavy-metal composite pollution geobiont validity, it is characterised in that this method includes following step Suddenly：S1, after the soil of heavy-metal composite pollution is air-dried, sieving preservation obtains combined contamination soil；S2, using agriculture and forestry organic waste material as raw material, particulate biomass is obtained after preliminary working, is carbonized through retort, prepare life Thing charcoal particle；S3, obtained charcoal particle in S2 is crushed, is air-dried after screening or dries preservation；S4, drying charcoal particle after S3 is screened is with the combined contamination soil that is obtained in S1 by 1:20~1:100 weight ratios It is stirred, and adding distilled water makes its water content reach the 50~70% of field capacity, then places 5~7 days, allows it to fill It is point decomposed, the charcoal earth mixtures of heavy-metal composite pollution is made and encapsulates preservation；S5, tobacco seedlings are transplanted in the charcoal earth mixtures obtained to S4 using well cellar for storing things formula young seedling transplanting method, at the same it is mixed with charcoal soil Compound uniformly fills Jing Jiao, and is filled to well head, keeps tobacco seedling growth point exposed.
- 2. the method according to claim 1 for reducing heavy-metal composite pollution geobiont validity, it is characterised in that：Institute The pollutant for the heavy-metal composite pollution soil stated includes two or more in following heavy metal：Cadmium (Cd), mercury (Hg), silver (Ag), copper (Cu), barium (Ba), lead (Pb), chromium (Cr) and arsenic (As).
- 3. the method according to claim 1 for reducing heavy-metal composite pollution geobiont validity, it is characterised in that：S1 The soil types includes yellow earth, red soil, brown earth, cinnamon soil, black earth, chestnut soil, desert soil, moisture soil, anthropogenic-alluvial soil, rice soil, purple The one or more of soil and rendzinas.
- 4. the method according to claim 3 for reducing heavy-metal composite pollution geobiont validity, it is characterised in that：S1 The soil types is rendzinas, lime radii of soil particles≤2mm of use.
- 5. the method according to claim 1 for reducing heavy-metal composite pollution geobiont validity, it is characterised in that：S2 Described in agriculture and forestry organic waste material be tobacco rod, maize straw, rape stalk, rice straw, rice husk, wood chip, Chinese medicine slag, in peanut shell One or more.
- 6. the method according to claim 1 for reducing heavy-metal composite pollution geobiont validity, it is characterised in that：S2 The preparation of middle charcoal particle comprises the following steps：Agriculture and forestry organic waste material is dried by removal of impurities, concentration successively and air-dries and crushes, is obtained To dry particulate biomass raw material；Then carbonized using combined bio matter granule carbonization furnace, in carbonization process Material is supplemented to control oxygen supply amount by way of each feed supplement thickness is 10-20cm, so as to carbonization temperature in holding furnace At 250-450 DEG C or so, finally realize that retort endogenous substance carbonizes completely.
- 7. the method according to claim 1 for reducing heavy-metal composite pollution geobiont validity, it is characterised in that：S3 During middle charcoal particle screen selecting, select particle diameter≤1mm charcoals particle and be well mixed with combined contamination soil particle.
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| CN109013679A (en) * | 2018-09-07 | 2018-12-18 | 陕西理工大学 | A kind of absorption method for blocking and controlling of Shan south tea garden soil heavy metal Cd |
| CN109181704A (en) * | 2018-09-12 | 2019-01-11 | 四川中地安土壤修复技术有限公司 | A kind of heavy metal-polluted soil and organic contamination renovation agent and its preparation and application method |
| CN109622599A (en) * | 2019-02-02 | 2019-04-16 | 湖南大学 | A method of arsenic pollution agricultural land soil is repaired using dewatered sludge and charcoal Mixed Surfactant System |
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| CN109622599A (en) * | 2019-02-02 | 2019-04-16 | 湖南大学 | A method of arsenic pollution agricultural land soil is repaired using dewatered sludge and charcoal Mixed Surfactant System |
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