CN106984641A - The chemical stabilizer and the restorative procedure of heavy-metal contaminated soil repaired for heavy-metal contaminated soil - Google Patents
The chemical stabilizer and the restorative procedure of heavy-metal contaminated soil repaired for heavy-metal contaminated soil Download PDFInfo
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- CN106984641A CN106984641A CN201710117728.6A CN201710117728A CN106984641A CN 106984641 A CN106984641 A CN 106984641A CN 201710117728 A CN201710117728 A CN 201710117728A CN 106984641 A CN106984641 A CN 106984641A
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- contaminated soil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Abstract
The invention discloses a kind of chemical stabilizer repaired for heavy-metal contaminated soil and the restorative procedure of heavy-metal contaminated soil, include solid-state conditioner and liquid stabilizer for the chemical stabilizer that heavy-metal contaminated soil is repaired, institute's solid-state conditioner includes the component of following parts by weight：40~55 parts of flyash, 20~35 parts of ardealite, 15~30 parts of red mud；Liquid stabilizer is the zeroth order Nanoscale Iron suspension that rhamnolipid disperses.The restorative procedure of heavy-metal contaminated soil comprises the following steps：(1) apply solid-state conditioner on the surface of heavy-metal contaminated soil to be nursed one's health；(2) liquid stabilizer is sprayed again to reduce the heavy metal in contaminated soil.The restorative procedure of the heavy-metal contaminated soil has that cost is low, effect is good, efficiency high, advantages of environment protection.
Description
Technical field
The present invention relates to soil remediation Treatment process field, more particularly to a kind of change repaired for heavy-metal contaminated soil
Learn the restorative procedure of stabilizer and heavy-metal contaminated soil.
Background technology
As Industry Structure is upgraded, city layout is adjusted, many cities are emerged in large numbers the closing of large quantities of contaminating enterprises and removed
Move phenomenon, cause city occur in that it is a large amount of leave industrial pollution place, during wherein heavy-metal contaminated soil is industrial pollution place
A relatively conventional type.These contaminated sites face recycling and occur the change of land-use style mostly, due to heavy metal
There is chronicity, potentiality and irreversibility to the harm of animals and plants and human body, should be carried out before contaminated soil recycling corresponding
Repair to ensure the health of space enrironment and resident.
Current heavy-metal contaminated soil reparation mainly has a few major class methods such as physics, chemistry, biology.Physical method first will
Contaminated soil is dug out, then the contaminated soil dug out is eluted, air lift or heat treatment etc., these measures have effect thoroughly,
Stable the advantages of, but there are problems that processing cost is high, construct simultaneously, it is difficult to carry out large-scale promotion.Biological method bag
Phytoremediation technology and microorganism remediation technology are included, biological method implements easier, with small investment and few etc. to environmental perturbation
Advantage, but there is also more limiting factor：The reparation of phytoremediation technology is limited with floristics, and its reparation speed is slower,
The problems such as reprocessing for accumulating plurality of heavy metal plant is also the principal element for limiting phytoremediation technology large-scale promotion；Equally
The reparation of microorganism remediation technology is also limited with microbe species, and because microorganism organism is smaller, the heavy metal amount of reparation
Also less, reparation speed is slower, so as to limit the large-scale promotion of microorganism remediation technology.Chemical method mainly includes extracting
Method, solidification method, electrochemical method, using modifying agent method etc..Wherein chemical fixation, also referred to as chemically stable method, be it is a kind of compared with
For ripe and economically viable method, the technology using stabilizer or fixative and the heavy metal in soil occur hydration reaction,
The physics chemical actions such as redox, chelating, precipitation, absorption, by changing the chemical form of heavy metal in soil or reducing it
Migration, so as to reach the effect of repairing and treating.It is big, solid with applied widely, processing capacity compared with other recovery techniques
Earnest species is more, instant effect, notable effect the advantages of, therefore with preferable application prospect.
Conventional chemical fixatives are divided into several major classes such as natural minerals, organic matter, lime, displacement metal class at present, this
A little chemical fixatives are respectively present following problem：The fixed efficiency of natural minerals type fixative heavy metal is low；Organic
When fixative is used for heavy-metal contaminated soil reparation, there is secondary pollution；Lime fixative is typically to change soil pH to make weight
Metal formation hydroxide and carbonate precipitation, the fixative containing lime constituents can cause to repair after soil is added to
Soil hardening, increase-volume after multiple, and the compounds such as the hydroxide formed after hydration reaction and carbonate are leaned on merely to soil
The fixed effect of middle heavy metal is easily influenceed by external environmental condition, and soil passes through long-term weathering and acid-rain corrosion, wherein
Heavy metal exist can dissolution again potential danger.Displacement metal is mainly sub-micron or Nanoscale Iron, with relatively strong reduction
Ability, can come out in metal replacement thereafter being arranged in metal activity series table and be deposited on the surface of iron so as to reaching removal
The purpose of pollution.But sub-micron or Nanoscale Iron cost are high, and easily aoxidized by the medium (such as dissolved oxygen, water) of surrounding, cause it
Utilization ratio is reduced；In addition, nano zero valence iron transmits very slow in non-loose medium, it is further limit in soil remediation
The application of aspect.Therefore, its original reactivity how is kept as far as possible and is fully contacted with pollutant, is improved and is repaired effect
Rate and reduction reaction cost, are the keys that nano zero valence iron obtains heavy metal-polluted soil repairing effect.
The content of the invention
The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art, and first purpose is to provide a kind of cost
The chemical stabilizer that low, effect is good, efficiency high, environment-friendly heavy-metal contaminated soil are repaired；Second purpose is to provide
The restorative procedure for the application aforementioned stable agent restoration of soil polluted by heavy metal stated.
In order to solve the above technical problems, the present invention uses following technical scheme：
A kind of chemical stabilizer repaired for heavy-metal contaminated soil, including solid-state conditioner and liquid stabilizer, institute
Stating solid-state conditioner includes the component of following parts by weight：40~55 parts of flyash, 20~35 parts of ardealite, 15~30 parts of red mud；
The liquid stabilizer is the zeroth order Nanoscale Iron suspension that rhamnolipid is coated.
It is preferred that, the preparation method of the liquid stabilizer is：Under protective atmosphere and mechanical agitation, by rhamnose liposoluble
Liquid is added in ferric chloride solution, then NaHB is added dropwise4Solution is reacted, and the zeroth order Nanoscale Iron for obtaining rhamnolipid cladding is suspended
Liquid.
It is preferred that, the concentration of the rhamnolipid solution is 2g/L~3g/L；The concentration of the ferric chloride solution is
0.15mol/L~0.25mol/L；The NaHB4The concentration of solution is 0.3mol/L~0.5mol/L；The rhamnose liposoluble
Liquid, ferric chloride solution and NaHB4The volume ratio of solution is 2: 1: 1.
It is preferred that, the protective atmosphere is nitrogen, and the churned mechanically rotating speed is 350r/min~550r/min.
It is preferred that, the solid-state conditioner includes the component of following parts by weight：45~50 parts of flyash, ardealite 25~30
Part, 20~25 parts of red mud.
It is preferred that, the solid-state conditioner includes the component of following parts by weight：48 parts of flyash, 27 parts of ardealite, red mud
22 parts.
As a total inventive concept, the present invention also provides a kind of restorative procedure of heavy-metal contaminated soil, including with
Lower step：
(1) the thick above-mentioned solid-state conditioners of 1cm~2cm are applied on the surface of heavy-metal contaminated soil, then by heavy metal
Soil thick contaminated soil top layer 15cm~25cm is well mixed with the solid-state conditioner applied by way of turning over；
After (2) 1~2 months, above-mentioned liquid stabilizer is sprayed in heavy-metal contaminated soil, conserved 4~6 months
Afterwards, the reparation of heavy metal contaminated soil is completed.
It is preferred that, in the step (2), the addition of the liquid stabilizer for heavy metal pollution upper soll layer 15cm~
The 15%~30% of soil quality thick 25cm.
Compared with prior art, the advantage of the invention is that：
1st, the chemical stabilizer repaired for heavy-metal contaminated soil of the invention, passes through solid-state conditioner and liquid stable
The combination of agent, promotes the ability of their synergy restoration of soil polluted by heavy metal.Solid-state conditioner is flyash, phosphorus
The mixture of gypsum and red mud composition, on the one hand can form the rigid lattice structure of high osmosis in heavy-metal contaminated soil,
Beneficial to the uniform quick infiltration of the liquid stabilizer containing nano zero valence iron；On the other hand suction can be played to Heavy Metals in Contaminated Soils
Attached, trapping and chelation, are reduced beneficial to nano zero valence iron fast accurate to the heavy metal in contaminated soil；So as to big
Nano zero-valence iron unilization is improved greatly, the cost of heavy-metal contaminated soil reparation is greatly reduced.
2nd, the present invention is disperseed by rhamnolipid to zeroth order Nanoscale Iron, and one side rhamnolipid disperses nano zero valence iron
The surrounding of particle, is similar to organic network and is surrounded nanometer nulvalent iron particle, is effectively reduced nano zero-valence iron particle
With the contact area of the medium (such as dissolved oxygen, water) of surrounding, nano zero valence iron is prevented to be reacted with surrounding medium, so that
Maintain its higher reactivity.Another aspect rhamnolipid can change the surface charge distribution of nano zero valence iron, produce electrostatic
Stabilizing effect, steric hindrance effect and electrostatic space stability ultimate load effect, so as to effectively prevent the group between nano zero valence iron
Poly- effect, improves dispersiveness, the stability of nano zero valence iron.In addition, the carboxyl of rhamnolipid, hydroxyl can be with heavy metal formation chelas
Compound, particularly heavy metal lead have good chelate effect, with being further conducive to nano zero valence iron fast accurate to dirt
Heavy metal in dye soil is reduced.Thus the liquid stabilizer can further increase nano zero valence iron in contaminated soil
The efficiency that is reduced of heavy metal, reduce the cost of heavy-metal contaminated soil reparation.
Brief description of the drawings
Fig. 1 is the SEM photograph of the liquid stabilizer of the embodiment of the present invention 1, wherein, (b) figure is the high-resolution of (a) figure
Figure.
Embodiment
Below in conjunction with specific preferred embodiment, the invention will be further described, but not thereby limiting the invention
Protection domain.
Embodiment 1：
The preparation for the chemical stabilizer repaired for heavy-metal contaminated soil
(1) preparation of solid-state conditioner：Flyash, ardealite and red mud is more mixed than uniform according to 48: 27: 22 weight
Close, obtain solid-state conditioner；
(2) preparation of liquid stabilizer：It is 2 by volume ratio under nitrogen atmosphere and mechanical agitation (rotating speed 400r/min):
1 rhamnolipid solution (2g/L) and FeCl3After solution (0.2mol/L) is sufficiently mixed, then it is added dropwise and FeCl3Solution is isometric
NaHB4Solution (0.4mol/L) is reacted, and after bubble not after generation, reaction is finished, and obtains the zeroth order of rhamnolipid cladding
Sealing preserve under Nanoscale Iron suspension, normal temperature.
Fig. 1 is the scanning electron microscope (SEM) photograph for the zeroth order Nanoscale Iron suspension that rhamnolipid manufactured in the present embodiment is coated, can by figure
Know, zeroth order nano iron particles are uniformly dispersed, and rhamnolipid successfully gets up zeroth order Nanoscale Iron cladding.
The zeroth order Nanoscale Iron that market is bought is dispersed in water, wherein, content and step of the zeroth order Nanoscale Iron in dispersion liquid
Suddenly the zeroth order nanometer iron content in the zeroth order Nanoscale Iron suspension for the rhamnolipid cladding that prepared by (2) is identical, by the upper of same volume
The zeroth order Nanoscale Iron suspension that rhamnolipid prepared by the dispersion liquid and step (2) for stating zeroth order Nanoscale Iron is coated is sprayed at lead respectively
Determined respectively in the soil of content severe overweight, after 2 months heavy metal in soil lead weak acid extractable and reducible state hundred
Divide content, as a result such as table 1, as shown in Table 1, the zeroth order Nanoscale Iron of rhamnolipid cladding is obvious to the stabilization efficiency of the lead in soil
Higher than zeroth order Nanoscale Iron.
Embodiment 2：
A kind of restorative procedure of heavy-metal contaminated soil, comprises the following steps：
(1) step of the thick embodiments 1 of 2cm is applied on the surface of Changning City Shuikoushan Pb-Zn ore district heavy-metal contaminated soil
Suddenly the solid-state conditioner that prepared by (1), then soil thick heavy-metal contaminated soil top layer 25cm and the solid-state conditioner of application are led to
The mode turned over is crossed to be well mixed；
After (2) 2 months, liquid stabilizer prepared by (2) the step of embodiment 1 is sprayed at heavy-metal contaminated soil
In, the addition of per kilogram contaminated soil is 25%wt.After maintenance 6 months, heavy metal Pb in former heavy-metal contaminated soil,
Zn, Cu, Cd, Hg overwhelming majority have been reduced into the heavy metal of low price immobilization, illustrate that this method realizes heavy metal Polluted Soil
The in-situ immobilization of earth, the soil environment quality after reparation meets China《Standard of soil environment quality》(GB 15618-1995) one
The requirement of level standard value.
Comparative example 1：
A kind of restorative procedure of heavy-metal contaminated soil, comprises the following steps：
Liquid stabilizer prepared by (2) the step of embodiment 1 is sprayed at a Changning City Shuikoushan Pb-Zn ore district huge sum of money
Belong in contaminated soil, the addition of per kilogram contaminated soil is 25%wt.After maintenance 8 months, in former heavy-metal contaminated soil
Heavy metal Pb, Zn, Cu, Cd, Hg have largely been reduced into the heavy metal of low price immobilization, determine heavy metal in soil lead after repairing
Residual form percentage composition be 81.3%, and embodiment 1 repair after heavy metal in soil lead residual form percentage composition
Up to 92.5%, illustrate that solid-state conditioner of the heavy-metal contaminated soil early stage by the present invention is nursed one's health, on the one hand can be in a huge sum of money
Belong to the rigid lattice structure that high osmosis is formed in contaminated soil, beneficial to the uniform quick of the liquid stabilizer containing nano zero valence iron
Penetrate into；On the other hand absorption, trapping and chelation can be played to Heavy Metals in Contaminated Soils, it is quickly smart beneficial to nano zero valence iron
Quasi- ground is reduced to the heavy metal in contaminated soil；So as to substantially increase nano zero-valence iron unilization.
Embodiment 3：
A kind of restorative procedure of heavy-metal contaminated soil, comprises the following steps：
(1) 2cm thickness is applied on the surface of the coloured mining area left over by history heavy-metal contaminated soil in Linwu County Xianghualing Area
Embodiment 1 the step of (1) solid-state conditioner for preparing, then by soil thick heavy-metal contaminated soil top layer 20cm with applying
Solid-state conditioner is well mixed by way of turning over；
After (2) 2 months, liquid stabilizer prepared by (2) the step of embodiment 1 is sprayed at heavy-metal contaminated soil
In, the addition of per kilogram contaminated soil is 20%wt.After maintenance 6 months, heavy metal Pb in former heavy-metal contaminated soil,
Zn, Cu, Cd, Hg are reduced into the heavy metal of low price immobilization, illustrate that this method realizes the original position of heavy metal contaminated soil and repaiied
Multiple, the soil environment quality after reparation meets China《Standard of soil environment quality》(GB 15618-1995) primary standard value
It is required that.
Finally be necessary described herein be：Above example is served only for making further detailed to technical scheme
Ground explanation, it is impossible to be interpreted as limiting the scope of the invention, those skilled in the art is according to the above of the invention
Some the nonessential modifications and adaptations made belong to protection scope of the present invention.Finally be necessary described herein be：With
Upper embodiment is served only for being described in more detail technical scheme, it is impossible to be interpreted as to the scope of the present invention
Limitation, those skilled in the art belongs to according to some nonessential modifications and adaptations for making of the above of the present invention
Protection scope of the present invention.
Claims (8)
1. a kind of chemical stabilizer repaired for heavy-metal contaminated soil, it is characterised in that including solid-state conditioner and liquid
Stabilizer, the solid-state conditioner includes the component of following parts by weight：40~55 parts of flyash, 20~35 parts of ardealite, red mud
15~30 parts；The liquid stabilizer is the zeroth order Nanoscale Iron suspension that rhamnolipid disperses.
2. the chemical stabilizer according to claim 1 repaired for heavy-metal contaminated soil, it is characterised in that the liquid
The preparation method of state stabilizer is：Under protective atmosphere and mechanical agitation, rhamnolipid solution is added in ferric chloride solution,
NaHB is added dropwise again4Solution is reacted, and obtains the scattered zeroth order Nanoscale Iron suspension of rhamnolipid.
3. the chemical stabilizer according to claim 2 repaired for heavy-metal contaminated soil, it is characterised in that the mouse
The concentration of Lee's glycolipid sample is 2g/L~3g/L；The concentration of the ferric chloride solution is 0.15mol/L~0.25mol/L；It is described
NaHB4The concentration of solution is 0.3mol/L~0.5mol/L；The rhamnolipid solution, ferric chloride solution and NaHB4The body of solution
Product is than being 2: 1: 1.
4. the chemical stabilizer according to claim 2 repaired for heavy-metal contaminated soil, it is characterised in that the guarantor
Shield atmosphere is nitrogen, and the churned mechanically rotating speed is 350r/min~550r/min.
5. the chemical stabilizer according to claim 1 repaired for heavy-metal contaminated soil, it is characterised in that described solid
State conditioner includes the component of following parts by weight：45~50 parts of flyash, 25~30 parts of ardealite, 20~25 parts of red mud.
6. the chemical stabilizer according to claim 5 repaired for heavy-metal contaminated soil, it is characterised in that described solid
State conditioner includes the component of following parts by weight：48 parts of flyash, 27 parts of ardealite, 22 parts of red mud.
7. a kind of restorative procedure of heavy-metal contaminated soil, it is characterised in that comprise the following steps：
(1) the thick solid state q-switcheds as described in any one of claim 1~6 of 1cm~2cm are applied on the surface of heavy-metal contaminated soil
Agent is managed, then by soil thick heavy-metal contaminated soil top layer 15cm~25cm and the solid-state conditioner applied by way of turning over
It is well mixed；
After (2) 1~2 months, the liquid stabilizer described in any one of claim 1~6 is sprayed in heavy-metal contaminated soil,
After maintenance 4~6 months, the reparation of heavy metal contaminated soil is completed.
8. the restorative procedure of heavy-metal contaminated soil according to claim 7, it is characterised in that in the step (2), institute
It is the 15%~30% of soil quality thick heavy metal pollution upper soll layer 15cm~25cm to state the addition of liquid stabilizer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710117728.6A CN106984641B (en) | 2017-03-01 | 2017-03-01 | Chemical stabilizer for repairing heavy metal contaminated soil and repairing method of heavy metal contaminated soil |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111073656A (en) * | 2018-10-18 | 2020-04-28 | 南京化学工业园环保产业协同创新有限公司 | Novel heavy metal stabilizer and method for treating heavy metal contaminated soil by using same |
| CN113578916A (en) * | 2021-06-23 | 2021-11-02 | 常熟理工学院 | Method for realizing resource utilization of phosphogypsum by utilizing waste incineration fly ash |
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