CN106391690A - Method for improving remediation effect of cadmium polluted soil - Google Patents
Method for improving remediation effect of cadmium polluted soil Download PDFInfo
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- CN106391690A CN106391690A CN201610388956.2A CN201610388956A CN106391690A CN 106391690 A CN106391690 A CN 106391690A CN 201610388956 A CN201610388956 A CN 201610388956A CN 106391690 A CN106391690 A CN 106391690A
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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
- B09C1/085—Reclamation of contaminated soil chemically electrochemically, e.g. by electrokinetics
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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
Abstract
The invention discloses a method for improving remediation effect of cadmium polluted soil. The method adopts a direct-current electric field-plant combined remediation method, so that the remediation effect of cadmium polluted soil is effectively improved, and remediation efficiency of soil cadmium pollution is improved by 20%-38%.
Description
Technical field
The present invention relates to a kind of soil remediation method, improve cadmium pollution soil reparation effect particularly to a kind of
The method of fruit.
Background technology
According to soil national Soil Pollution Investigation publication report in 2014, the total soil in the whole nation is exceeded
Rate is 16.1%, and pollution type, based on inorganic type, accounts for the 82.8% of always exceeded digit.And inorganic dirt
In the exceeded situation in dye object point position and exceeded tight with cadmium, nickel, mercury, arsenic, copper, lead, chromium, 8 kinds of zinc
Weight.Wherein highest is heavy metal cadmium, and point position exceeding standard rate is up to 7%, and in increasing year by year.
Soil environment is once by cadmium pollution, soil microbial activities reduce, thus have impact on crop yield, product
Matter, and got up by accumulation in food chain entrance human body or animal body.According to cadmium in recent years to the mankind
Cause harm report in, indicate mankind's excess intake Cd easily cause prostate cancer, kidney,
The serious disease being even difficult to cure such as cancer of the stomach, itai-itai.Therefore the improvement to Cd pollution has become as
The task of top priority.
Soil restoring technology mainly has physics, chemistry, biological 3 class repair modes at present.And conventional
Method has soil heavy metal pollution of soil, eluent solvent method, casting method, biological restoration, Water distillation extractor, electricity
Dynamic repairing method etc..Eluent solvent technology be with physicochemical mode to soluble organic in soil or
Inorganic pollution plays removal effect, but for can not the pollutant of solubization and the high soil of packing,
Its action effect is very low.In addition, a large amount of chemical reagent used in Soil leaching process are to soil originally
Body property and its environment will also result in serious impact, and relatively costly.Thermal desorption and steam extraction
Method is mainly for the soil having volatile organic pollution and have volatile metal mercury pollution
Earth, its range of application is less.Though and adopting chemical fixation reparation can reduce the poison of pollutant in soil
Property, but pollutant can not be allowed to eradicate in soil, once the condition such as environment, weather changes, such as exist
Under the influence of the factors such as rainfall increases, temperature lifting, pollutant may discharge again, can cause on the contrary
Sudden soil issues, so that soil repeats to administer.Bioremediation technology is broadly divided into phytoremediation skill
Art and microorganism remediation technology two class, the key of wherein phytoremediation technology is tolerant plant or ultraproduct is tired out
The corresponding selection of plant and its directive breeding etc. require, and phytoremediation is higher to soil environment requirement.
, mainly for organic pollution in rehabilitating soil, such as oil pollution, agricultural chemicals are dirty for microorganism remediation technology
Dye, can not play effective repair to most heavy metals.In therefore how solving to repair
Quantities is big, costly, soil fertility decline or soil texture destroy, secondary pollution the shortcomings of again
Become the main problem that need to solve in soil pollution repair process for the today's society.
Phytoremediation technology refer to using plant absorption, accumulation, fixing or volatilization pollutant in soil from
And recover and rebuild to degenerate or contaminated soil.Sorted out according to phytoremediation mechanism, can be divided into：(1)
Plant extraction (phytoextraetion) (2) phytovolatilization (Phytovolatization)；(3) plant is fixed
(phytostabilisation)；(4) plant intensifies (phytostimulation)；(5) plant degradation
(phytodegradation).Plant extraction technology refers to plant some special plants, is inhaled using its root system
Receive the poisonous and harmful substance in contaminated soil and migrate to plant shoot, by gathering in overground part material
Take away a kind of method of pollutant in soil.Plant degradation technology refers to that in plant body, metabolism will be inhaled
The pollutant received is decomposed, or by the effect of plant secretion enzyme, pollutant in soil is directly entered
Row decomposes.This technology majority is applied in the moderate contaminated soil of hydrophobicity.Plant-securing technique refers to
So that pollutant in soil is converted to relatively using some particular matters of plant rhizosphere and stablize harmless thing
Matter.Plant is intensified and refers to that plant is subject to environmental contaminants to stimulate, and produces special secretory substance and change
The mode of form of poluttants.Phytovolatilization refers to absorb pollutant in soil after in vivo and by its turn
Turn to a kind of phytoremediation mode that gaseous material is released to air.For cadmium pollution soil, plant
Thing extracts recovery technique most practicality and application.
Plant extraction recovery technique is by soil using the strong plant of hyperaccumulative plant or accumulation ability
Certain excessive element or compound transfer to plant above ground portion in large quantities thus playing rehabilitating soil pollution
Effect.Plant extraction recovery technique have simple to operate, economically and technically can large area real
The advantage applied.Therefore plant extraction recovery technique already becomes the Disciplinary Frontiers of Environmental science and technology.
Hyperaccumulative plant concept is to refer to the plant of excess absorption and accumulation heavy metal, and usual plant above ground
In portion's tissue, the heavy metal concentration of accumulation can reach more than 100 times of common plant, but does not affect its life
Long growth.Up to the present, the hyperaccumulative plant having been found that all over the world kind more than totally 500, wherein
Mainly nickel hyperaccumulative plant is more, and Cd hyperaccumulator is more rare.
The inferior position of phytoremediation technology is：(1) most of hyperaccumulative plants plant itself is short and small, raw
Long slow, excessive cycle, climate ambient influnence limits.(2) hyperaccumulative plant super enrichment corresponding element
Element is more single.(3) hyperaccumulative plant for heavy metal high density pollution soil cannot play original efficiently
Repair ability.
Therefore existing research on the basis of, take more fortification of plants recovery technique or plant technology and its
Mode associated with his technology lifts the efficiency of phytoremediation heavy metal.The Investigation on intensification of phytoremediation technology
It is broadly divided into fortification of plants repairing performance to strengthen with phytoremediation technology.The former passes through genetic engineering or work
Thing breeding technique changes plant repairing performance itself, and the latter passes through to apply chemical reagent, microorganism formulation
Deng as heavy metal activity in soil additive activating soil, promote plant absorption, thus improving plant
The efficiency of remediating heavy metal.Abroad, the research of hardening agent fortification of plants recovery technique is more.
Such research in China also quickly increases.
Content of the invention
It is an object of the invention to provide a kind of method improving cadmium pollution soil repairing effect, using straight
Stream electric field-plant combined repairing method, effectively increases cadmium pollution soil repairing effect, Cadmium Pollution in Soils
Remediation efficiency increases 20%-38%, can substantially shorten the time needed for phytoremediation.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of method improving cadmium pollution soil repairing effect,
(1) on cadmium pollution soil, addition heavy metallic activation agent (activator can be reacted with heavy metal,
Generate soluble complex compound, improve transfer ability in soil for the heavy metal ion), turn over, then
Sedum alfredii Hance, cuttage 200-300 strain cuttings on every square metre of cadmium pollution soil, life naturally are planted in cuttage
Length is educated root to cuttings and is completed (cuttings educates the root deadline at 15-18 days about).
(2) 40-60 days (east of culture Sedum alfredii Hance under the conditions of DC electric field and then is applied on cadmium pollution soil
Southern red-spotted stonecrop is cultivated as naturally growing)；
(3) gather in Sedum alfredii Hance, repeat step (2) is until soil remediation completes.
Electric repairing technique accelerates the desorption rate of heavy metal on soil particle surface, improves soil
The concentration of heavy metal in solution.And phytoremediation technology can be faster by the heavy metal in contaminated soil
Transfer to plant shoot.Therefore DC electric field-plant combined repairing method may be repaiied than both are single
Compound method effect is more excellent.But the drawbacks of both there is also certain, research shows, electrodynamics combines
In phytoremediation, electric field does not directly have undesirable effect to plant, but can change the chemistry of soil
Property, leads to the soil acidification of anode region indirectly, thus suppressing the growth of plant.
Sedum alfredii Hance, as the zinc of Chinese ecosystem, Cd hyperaccumulator, is natural evolution, belongs to
Crassulaceae, has the specifiability restraining oneself and being enriched with Treatment with High Concentration Zinc, cadmium, and tool possesses exuberant vitality
With fertility, it is preferable phytoremediation material.The present invention adopts DC electric field-Sedum alfredii Hance joint
Restorative procedure, applies the desorption rate that DC electric field accelerates cadmium on soil particle surface, improves soil molten
The concentration of cadmium in liquid, so that the cadmium in contaminated soil can be transferred on the ground by Sedum alfredii Hance faster
Portion, by gather in Sedum alfredii Hance aerial part, then allow its repeated growth breeding mode, thus reducing
Cadmium in Soil concentration, reaches the purpose of reparation.For DC electric field-Sedum alfredii Hance combined remediation method can
The soil acidification leading to anode region that can exist, thus suppressing the problem of plant growth, the present invention is carried out
Particular design, the first present invention before plantation Sedum alfredii Hance first using heavy metallic activation agent, with much money
Belong to activator energy activating soil in cadmium so that cadmium under electric field action can preferably dissolution, weigh simultaneously
Metal activation agent can also provide abundant nutrition for follow-up plantation Sedum alfredii Hance, accelerates the life of Sedum alfredii Hance
Long, improve and repair speed, secondly, the present invention has carried out specific design to the DC electric field applying,
To voltage, daily energising and direction of an electric field are all improved, so as to be prevented effectively from the soil of anode region
Earth is acidified problem, and strengthens the uniformity of soil pH value, so as to solve well DC electric field-
The drawbacks of Sedum alfredii Hance is combined.
Preferably, described heavy metallic activation agent is organic commercial fertilizer or humic acid.
Preferably, Rate of Organic Fertilizer is 800-1500kg/ mu, Rate of Humic Acid is 200-300kg/ mu.
Preferably, the length of cuttings is in 5-8cm.Cuttings is cuttage material, is to carry 3-5 for cuttage
The segment branch of piece blade.
Preferably, keeping the water-holding capacity of cadmium pollution soil during soil remediation in 60-70%.
Taking logical galvanic mode to realize preferably, applying DC electric field, being specifically configured to：Energising electricity
Source adopts D.C. regulated power supply, and electrode adopts high-purity (carbon content>99.99%) graphite electrode piece, by height
Pure graphite electrode piece is inserted directly into cadmium pollution soil, by the energising of 0.5-1.0v/cm voltage gradient, leads to daily
Electric 4-6h, exchanges direction of an electric field in every 1-2 days.Energising total time and culture 40-60 days phases of Sedum alfredii Hance
With.The present invention has carried out specific design to the DC electric field applying, to voltage, daily conduction time
And direction of an electric field is all improved, so as to be prevented effectively from the soil acidification problem of anode region, and increase
The uniformity of strong soil pH value, so as to solve disadvantage associated with DC electric field-Sedum alfredii Hance well
End.
Preferably, the cadmium concentration of described cadmium pollution soil is more than 0.3mg/kg.
Preferably, the cadmium concentration that the standard that soil remediation completes is soil is less than 0.3mg/kg.
The invention has the beneficial effects as follows：Using DC electric field-Sedum alfredii Hance combined remediation method, effectively carry
High cadmium pollution soil repairing effect, Cadmium Pollution in Soils remediation efficiency increases 20%-38%.
Brief description
Fig. 1 is different voltage gradients, the impact to soil Cd validity for the conduction time.
Fig. 2 is the not impact to soil Cd validity for the same electric field swap time.
Fig. 3 is the impact to Sedum alfredii Hance the upperground part biomass for the different disposal.
Fig. 4 is the impact to Sedum alfredii Hance overground part Cd content for the different disposal.
Fig. 5 different disposal is enriched with the impact of total amount to Sedum alfredii Hance overground part Cd.
The impact to soil available cadmium content for Fig. 6 different disposal.
The impact to soil Cd remediation efficiency for Fig. 7 different disposal.
Specific embodiment
Below by specific embodiment, technical scheme is described in further detail.
In the present invention, if not refering in particular to, the raw material being adopted and equipment etc. are all commercially available or this
Field is commonly used.Method in following embodiments, if no special instructions, is the routine side of this area
Method.
Embodiment 1：
A kind of method improving cadmium pollution soil repairing effect,
(1) it is more than in cadmium concentration on the cadmium pollution soil of 0.3mg/kg, add heavy metallic activation agent, with much money
Genus activator is feces of livestock and poultry (organic commercial fertilizer, commercially available), and feces of livestock and poultry consumption is 800-1500kg/
Mu, turns over, then cuttage plantation Sedum alfredii Hance, and 200 plants of cuttage on every square metre of cadmium pollution soil is inserted
Fringe, the length of cuttings, in 5-8cm, is cultivated 18 days, cuttings is educated root and completed；
(2) and then cultivate Sedum alfredii Hance 60 days under the conditions of DC electric field is applied on cadmium pollution soil；Apply
DC electric field takes logical galvanic mode to realize, and is specifically configured to：Energizing source adopts DC voltage-stabilizing
Power supply, electrode adopts high-purity (carbon content>99.99%) graphite electrode piece, will be straight for high pure graphite electrode piece
Patch into cadmium pollution soil, by the energising of 1.0v/cm voltage gradient, be energized 4h daily, exchanges within every 1 day
Direction of an electric field.
(3) gather in Sedum alfredii Hance, until soil remediation completes, now the cadmium of soil is dense for repeat step (2)
Degree is less than 0.3mg/kg.
Embodiment 2：
A kind of method improving cadmium pollution soil repairing effect,
(1) it is more than in cadmium concentration on the cadmium pollution soil of 0.3mg/kg, add heavy metallic activation agent, with much money
Genus activator is humic acid, and Rate of Humic Acid is 200-300kg/ mu, turns over, then cuttage plantation east
Southern red-spotted stonecrop, 300 plants of cuttings of cuttage on every square metre of cadmium pollution soil, the length of cuttings in 5-8cm,
Culture 15 days, cuttings is educated root and is completed；
(2) and then cultivate Sedum alfredii Hance 40 days under the conditions of DC electric field is applied on cadmium pollution soil；Apply
DC electric field takes logical galvanic mode to realize, and is specifically configured to：Energizing source adopts DC voltage-stabilizing
Power supply, electrode adopts high-purity (carbon content>99.99%) graphite electrode piece, will be straight for high pure graphite electrode piece
Patch into cadmium pollution soil, by the energising of 0.5v/cm voltage gradient, be energized 6h daily, exchanges within every 2 days
Direction of an electric field.
(3) gather in Sedum alfredii Hance, until soil remediation completes, now the cadmium of soil is dense for repeat step (2)
Degree is less than 0.3mg/kg.
Test：
Test soil：Soil picks up from Fuyang, Zhejiang city Chang An town Electroplate Factory periphery heavy-metal contaminated soil.
Take topsoil 0-20cm, after room-dry, remove chad, larger root system and plant residue, levigate 2mm excessively
Nylon mesh, standby after fully mixing.After measured, soil pH 7.78, total cadmium content is 31.65mg kg-1,
Available Cd content is 12.0mg kg-1(using DTPA extractant).
1) test process：
The soil crossing 5mm sieve is loaded in the plastic tub of a size of 305mm × 210mm × 110mm,
Every basin dress soil 4kg.High pure graphite electrode piece is inserted plastic tub two ends, and it is steady to access direct current with wire
Depressor two ends carry out energising experiment, arrange 4 voltage gradients, respectively：0.5V/cm、1.0V/cm、
1.5V/cm、2.0V/cm.Then correspond to the difference of daily conduction time, choose 3h/d, 6h/d, 9h/d,
Set no electric field comparison simultaneously.Each process is repeated 3 times.The moisture content of every basin soil is maintained at field and holds
The 60% of the water yield.
In being persistently energized 5 days, apart from anode 2cm (nearly anode), 15cm (middle) and 28cm
(nearly negative electrode) sets 3 thief holes (internal diameter as 1cm), daily soil sampling analysis measure soil pH and
Available Cd content.Soil available Cadmium detrmination：Using standard NY/T 890-2004 Diethylenetriamine
Pentaacetic acid (DTPA) extraction, is finally measured with flame atomic absorption spectrophotometer.Off-test selects
Good electric-field intensity and conduction time.
Result of the test：Compared with comparison (no power), the validity of heavy metal in soil Cd is significantly increased,
Illustrate that the Cd of other forms in electrokinetic process converts to available state Cd.And the Cd of positively charged2+
In the presence of electric field, by electromigratory mode, constantly migrate toward cathodic region from anode region and make dirt
In dye soil, the concentration distribution of Cd produces change, and the Cd of negative electrode builds up.Voltage gradient is
1.0V/cm, the process of the daily 6h that is energized, soil available Cd content highest, after energising 5 days,
Available state Cd concentration near negative electrode reaches 13.07mg kg-1, exceed comparison 10.5% (see Fig. 1).
2) test process：
According to test (1) result, select voltage gradient 1.0V/cm, conduction time, 6h/d was as electric field
Condition, and no electric field comparison, unidirectional electric field (not exchanging direction of an electric field) are set, exchange electric field side within one day
To, exchange within two days direction of an electric field 4 process, continuous energising 4 days.After daily energising terminates, anti-
Offset is answered to take from anode 2cm (close to anode), 15cm (middle) and 28cm (nearly negative electrode) setting
Sample hole (internal diameter is 1cm).Daily soil sampling analysis measures soil pH, effective cadmium content.Test knot
Bundle selects optimal direction of an electric field swap time.
Result of the test：At the 1st day, unidirectional electric field (not exchanging direction of an electric field), one day exchange electric field side
There is no notable difference to, the soil available cadmium contents that exchange direction of an electric field 3 process for two days.But
At the 2nd day, the zone line soil available cadmium content exchanging direction of an electric field process for a day was significantly higher than
Unidirectional electric field and two days exchange directions of an electric field are processed, and at 3,4 days, exchange direction of an electric field and two days within one day
The zone line soil available cadmium content exchanging direction of an electric field process is all remarkably higher than at unidirectional electric field
Reason, exchanged direction of an electric field effect preferably (Fig. 2) with one day especially.Exchange direction of an electric field, by charged particle
Near the two poles of the earth that displacement causes, the situation of soil meta-acid or meta-alkali is clearly better.
3) test process：
According to pre-stage test result, select voltage gradient 1.0V/cm, conduction time 6h/d, hand within one day
Change direction of an electric field as current field condition, heavy metallic activation agent selects humic acid fertilizer, fertilizer (animal dung
Just), EDTA.Test totally 2 (energising, no power) × 4 (CK, humic acid fertilizer, fertilizer (poultry
Poultry manure), EDTA)=8 process, 3 repetition.The dosage of additive is as shown in the table.
For examination soil and the same preliminary experiment of experimental rig, the native 4kg of zone line dress, add in soil and add
After agent stablizes one week, Sedum alfredii Hance in kind, 12 plants of every basin.Keep life under the conditions of 60% field capacity
Harvest plant after long 50d, take pedotheque simultaneously.Measure Sedum alfredii Hance biomass, cadmium content, soil
Earth available Cd and total cadmium content.Off-test selects to promote DC electric field-Sedum alfredii Hance restoring cadmium polluted
The optimum addn of soil.
Result of the test：
The impact to Sedum alfredii Hance the upperground part biomass for the different disposal：CK, fertilizer (feces of livestock and poultry),
Humic acid fertilizer, tetra- biomass processing Sedum alfredii Hance after powered up of EDTA all slightly decrease, fall
Width is 1.9-5.7%.The interpolation of fertilizer (feces of livestock and poultry) and humic acid fertilizer can promote Sedum alfredii Hance
Growth, the amplification of Sedum alfredii Hance biomass is respectively 43.7% and 16.3%；And add east after EDTA
Southern red-spotted stonecrop biomass reduce 7.5% (Fig. 3).
The impact to Sedum alfredii Hance overground part Cd content for the different disposal：CK, fertilizer (feces of livestock and poultry),
The Cd content that humic acid fertilizer, EDTA process Sedum alfredii Hance overground part after powered up is significantly increased, and increases
Width is respectively 26.6%, 61.6%, 47.5%, 33.6%.And compared with the control, fertilizer (livestock and poultry
Excrement), humic acid fertilizer, EDTA process significantly improve Sedum alfredii Hance overground part Cd content, amplification
It is respectively 7.3%, 19.0%, 6.1% (Fig. 4).
Different disposal is enriched with the impact of total amount to Sedum alfredii Hance overground part Cd：The heavy metal that Sedum alfredii Hance is taken away
The number of total amount is related to following two factors：Overground part biomass and plant content of beary metal, two
The product (Accumulation of heavy metals amount) of person really reflects additive combines to DC electric field-Sedum alfredii Hance and repaiies
The effect of multiple heavy metal-polluted soil.Fertilizer (feces of livestock and poultry) and applying of humic acid fertilizer not only increase
The biomass of Sedum alfredii Hance, also significantly increases Sedum alfredii Hance overground part Cd content simultaneously, therefore organic
Fertile (feces of livestock and poultry) and humic acid fertilizer process the Sedum alfredii Hance overground part Cd enrichment total amount that has been significantly increased,
Under the conditions of no power, Sedum alfredii Hance overground part Cd enrichment total amount amplification is respectively 54.3% and 38.4%,
Under power on condition, amplification is respectively 92.2% and 63.9%.Although applying of EDTA carries to a certain extent
High Sedum alfredii Hance overground part Cd content, but but have impact on the growth of Sedum alfredii Hance, reduce red-spotted stonecrop
Biomass, so under the conditions of no power, the Sedum alfredii Hance overground part Cd enrichment that EDTA is processed is total
Amount reduces 1.9%, under power on condition compared with the control on the contrary, and the Sedum alfredii Hance that EDTA is processed is on the ground
Cd enrichment total amount in portion also only improves 3.9%.
CK, fertilizer (feces of livestock and poultry), humic acid fertilizer, EDTA are processed after powered up although the southeast
The biomass of red-spotted stonecrop slightly decreases, but the range of decrease is also only in 1.9-5.7%, Sedum alfredii Hance ground after being energized
The Cd content on top is significantly increased, and amplification reaches 26.6-61.6%, therefore Sedum alfredii Hance overground part after energising
Cd enrichment total amount is significantly increased, and amplification is respectively 22.2%, 52.3%, 44.7%, 29.4%, with
Apply the effect of fertilizer (feces of livestock and poultry) preferably (Fig. 5).
The impact to soil available cadmium content for the different disposal：After soil energising, soil available cadmium
Content significantly improves, and amplification is in 6.3-12.1%.Fertilizer (feces of livestock and poultry), humic acid fertilizer, EDTA
Apply all different degrees of improve soil available cadmium content, under the conditions of no power, amplification is divided
Wei 2.6%, 9.4%, 7.1%；Under power on condition, amplification is respectively 6.04%, 9.02%, 5.02%.
Therefore, apply fertilizer (feces of livestock and poultry) to soil Cd activation effect preferably (Fig. 6).
The impact to soil Cd remediation efficiency for the different disposal：After red-spotted stonecrop harvests, measure in soil and remain
Cd content, calculates different disposal soil Cd remediation efficiency.CK, fertilizer (feces of livestock and poultry), corruption
Grow that acid is fertile, EDTA process remediation efficiency under the conditions of no power be respectively 5.72%, 8.31%,
7.55%th, 6.45%；It is respectively 7.27%, 10.08%, 8.97%, 7.61% under power on condition.
After soil energising, Cd remediation efficiency significantly improves, and amplification is in 18.1-27.1%.Fertilizer (animal dung
Just), humic acid fertilizer, EDTA apply all different degrees of improve soil Cd remediation efficiency,
Under the conditions of no power, amplification is respectively 45.3%, 32.0%, 12.7%；Under power on condition, amplification
It is respectively 38.6%, 23.4%, 4.7%.Therefore, apply fertilizer (feces of livestock and poultry) to soil Cd
Repairing effect is preferably (Fig. 7).
Embodiment described above is one kind preferably scheme of the present invention, not the present invention is appointed
What pro forma restriction, also has other on the premise of without departing from the technical scheme described in claim
Variant and remodeling.
Claims (8)
1. a kind of improve cadmium pollution soil repairing effect method it is characterised in that：
(1) on cadmium pollution soil, add heavy metallic activation agent, turn over, then cuttage plantation Sedum alfredii Hance,
Cuttage 200-300 strain cuttings on every square metre of cadmium pollution soil, naturally grows to cuttings and educates root and complete；
(2) and then cultivate Sedum alfredii Hance 40-60 days under the conditions of DC electric field is applied on cadmium pollution soil；
(3) gather in Sedum alfredii Hance, repeat step (2) is until soil remediation completes.
2. a kind of method improving cadmium pollution soil repairing effect according to claim 1, its feature exists
In：Described heavy metallic activation agent is feces of livestock and poultry or humic acid.
3. a kind of method improving cadmium pollution soil repairing effect according to claim 2, its feature exists
In：Feces of livestock and poultry consumption is 800-1500kg/ mu, and Rate of Humic Acid is 200-300kg/ mu.
4. the method for a kind of raising cadmium pollution soil repairing effect according to claim 1 or 2 or 3,
It is characterized in that：The length of cuttings is in 5-8cm.
5. the method for a kind of raising cadmium pollution soil repairing effect according to claim 1 or 2 or 3,
It is characterized in that：The water-holding capacity of cadmium pollution soil is kept in 60-70% during soil remediation.
6. the method for a kind of raising cadmium pollution soil repairing effect according to claim 1 or 2 or 3,
It is characterized in that：Applying DC electric field takes logical galvanic mode to realize, and is specifically configured to：Energising
Power supply adopts D.C. regulated power supply, and electrode adopts high pure graphite electrode piece, will be direct for pure graphite electrode piece
Insertion cadmium pollution soil, by the energising of 0.5-1.0v/cm voltage gradient, be energized 4-6h daily, every 1-2 days
Exchange direction of an electric field.
7. the method for a kind of raising cadmium pollution soil repairing effect according to claim 1 or 2 or 3,
It is characterized in that：The cadmium concentration of described cadmium pollution soil is more than 0.3mg/kg.
8. the method for a kind of raising cadmium pollution soil repairing effect according to claim 1 or 2 or 3,
It is characterized in that：The standard that soil remediation completes is that the cadmium concentration of soil is less than 0.3mg/kg.
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| CN107008744A (en) * | 2017-04-24 | 2017-08-04 | 广东环境保护工程职业学院 | A kind of method and soil remediation method for removing heavy metal in soil |
| CN107175254A (en) * | 2017-07-05 | 2017-09-19 | 湖南农业大学 | A kind of method using red three-coloured amaranth repairing and treating contaminated soil |
| CN108435770A (en) * | 2018-05-07 | 2018-08-24 | 常州大学 | A kind of method of electrodynamics joint Phytoremediation of Soils Contaminated by Heavy Metals |
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| CN107175254A (en) * | 2017-07-05 | 2017-09-19 | 湖南农业大学 | A kind of method using red three-coloured amaranth repairing and treating contaminated soil |
| CN108519424A (en) * | 2018-04-11 | 2018-09-11 | 浙江大学 | A kind of method that cyclic voltammetric analysis is carried out to solid-state humus in water phase electrolyte |
| CN108519424B (en) * | 2018-04-11 | 2019-06-28 | 浙江大学 | A kind of method that cyclic voltammetric analysis is carried out to solid-state humus in water phase electrolyte |
| CN108435770A (en) * | 2018-05-07 | 2018-08-24 | 常州大学 | A kind of method of electrodynamics joint Phytoremediation of Soils Contaminated by Heavy Metals |
| CN109848201A (en) * | 2019-01-14 | 2019-06-07 | 同济大学 | A kind of electronic power drive and electric-heating activated oxidation/reduction restorative procedure |
| CN110523772A (en) * | 2019-08-29 | 2019-12-03 | 安徽禾美环保集团有限公司 | A kind of chromium-copper combined pollution plant restoration method |
| CN110586640A (en) * | 2019-10-26 | 2019-12-20 | 闫娜 | Method for removing and recovering heavy metals in polluted soil |
| CN111069272A (en) * | 2019-12-09 | 2020-04-28 | 广东东图规划科技有限公司 | Method for repairing soil pollution |
| CN111687195A (en) * | 2020-05-29 | 2020-09-22 | 浙江大学 | Preparation of compost humus and method for restoring cadmium-polluted soil by using compost humus and combined plants |
| CN114226445A (en) * | 2022-01-17 | 2022-03-25 | 广西大学 | Activating agent for electrokinetic remediation of cadmium-contaminated soil and preparation method thereof |
| CN114350368A (en) * | 2022-01-17 | 2022-04-15 | 生态环境部南京环境科学研究所 | Method for repairing arsenic-polluted soil by using zeolite-based mineral repair material |
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