CN108126977A - The restorative procedure of lead-contaminated soil - Google Patents
The restorative procedure of lead-contaminated soil Download PDFInfo
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- CN108126977A CN108126977A CN201711449325.8A CN201711449325A CN108126977A CN 108126977 A CN108126977 A CN 108126977A CN 201711449325 A CN201711449325 A CN 201711449325A CN 108126977 A CN108126977 A CN 108126977A
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- soil
- lead
- leacheate
- 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
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to technical field of soil remediation, and in particular to a kind of restorative procedure of lead-contaminated soil includes the following steps, S1, takes contaminated soil, adds in chitosan solution, after stirring evenly, stands baking；S2, configuration leacheate, the leacheate include the component of following parts by weight：Water, 76 88 parts；Little Hua gold earpick element, 26 parts；Trishydroxymethylaminomethane, 25 parts；Sodium alginate, 10 18 parts；S3, it will be immersed in the leacheate that step 2 is configured through the soil that step 1 is handled, heating a period of time, separation of solid and liquid adds in maintenance liquid into soil, stirs evenly, and removes excessive moisture, completes to repair；Soil after pretreatment is eluted again with leacheate, and the removal rate of lead ion is obviously improved；The leacheate of the present invention has lead ion good removal to act on, and cost is relatively low；By the maintenance of maintenance liquid, the form stable of lead in soil, as time goes by, activated state content does not occur significantly to change in soil.
Description
Technical field
The invention belongs to technical field of soil remediation, and in particular to a kind of restorative procedure of lead-contaminated soil.
Background technology
Soil was the natural collecting post of all kinds of wastes and purified treatment place originally, and soil receives pollutant, not table
Show that soil is contaminated, only when each pollutant accommodated in soil is excessive, influence and be more than the self-purification capacity of soil,
So as in hygiene and produce harmful influence on epidemiology, just show that soil is contaminated.Cause soil pollution
The reason of it is very much, it is a large amount of to use the ore deposits containing heavy metal if pollutant settles in industrial sludge, agricultural garbage, sewage irrigation, air
Matter chemical fertilizer and pesticide etc..
The heavy metal of contaminated soil mainly includes the significant elements of bio-toxicities such as mercury, cadmium, lead, chromium and metalloid arsenic, with
And the elements such as zinc, copper, nickel for having certain toxicity；Heavy metal cannot be degraded by microorganisms, and be that environment is long-term, potential pollutant；
Because of the suction-operated of soil colloid and particulate matter, in soil, concentration is mostly distributed long-term existence into perpendicular drop；With in soil
Ligand (chlorion, sulfate ion, hydroxyl ion, corrosion matter etc.) effect, generates complex compound or chelate, heavy metal is caused to exist
There are the solubility and migratory activity of bigger in soil；Heavy metal-polluted soil can be bioaccumulation by food chain, generated biology and put
Big effect；The form of heavy metal is different, active, the conditions such as soil pH, Eh, particulate matter and content of organic matter different from toxicity
Its migration and conversion in the soil of profound influence.
Invention content
The present invention solves the above-mentioned technical problems in the prior art, provides a kind of restorative procedure of lead-contaminated soil.
To solve the above problems, technical scheme is as follows：
The restorative procedure of lead-contaminated soil, includes the following steps,
S1,15 parts by weight contaminated soils are taken, adds in the chitosan solution that 40-50 parts of mass fractions are 0.3-0.6%, stir
After mixing uniformly, 70-90 DEG C stands baking 24-48 hours；
S2, configuration leacheate, the leacheate include the component of following parts by weight：
Water, 76-88 parts；
Little Hua gold is picked one's ears plain (4 β-acetoxyl group-puppet guainane -11 (13)-alkene -12,8 α-lactone), 2-6 parts；
Trishydroxymethylaminomethane, 2-5 parts；
Sodium alginate, 10-18 parts；
S3, it will be immersed in the leacheate that step 2 is configured through the soil that step 1 is handled, heating a period of time, solid-liquid point
From, maintenance liquid is added in into soil, is stirred evenly, removal excessive moisture, completion reparation.
Preferably, the mass ratio of soil described in step 3 and maintenance liquid is 8:1-2.
Preferably, maintenance liquid described in step 3 includes the component of following parts by weight：
Ethyl carbamoylphosphate salt, 5-8 parts；
Sour diethylaminoethanol ester, 10-16 parts；
Water, 40-60 parts.
Preferably, it is 1-2% that maintenance liquid described in step 3, which is mass fraction, the phosphate buffer solution of pH=6-8.
Preferably, heating condition described in step 3 is：60-80 DEG C is heated 12-24 hours.
Preferably, leacheate described in step 3 includes the component of following parts by weight：
Water, 82 parts；
Little Hua gold is picked one's ears plain (4 β-acetoxyl group-puppet guainane -11 (13)-alkene -12,8 α-lactone), 4 parts；
Trishydroxymethylaminomethane, 3 parts；
Sodium alginate, 14 parts.
Preferably, after the completion of the step 3, by the soil of reparation and fresh untainted soil in mass ratio 1:1 mixing.
Preferably, in the contaminated soil activated state lead content in more than 550mg/kg.
Relative to the prior art, advantages of the present invention is as follows,
The restorative procedure of lead-contaminated soil of the present invention, by pre-processing, eluting, maintenance three-step approach repairs soil,
Soil after pretreatment is eluted again with leacheate, and the removal rate of lead ion is obviously improved；The leacheate of the present invention is to lead
Ion has good removal to act on, and cost is relatively low；By the maintenance of maintenance liquid, the form stable of lead in soil, with the time
It elapses, activated state content does not occur significantly to change in soil.
Specific embodiment
Embodiment 1：
The restorative procedure of lead-contaminated soil, includes the following steps,
S1,15 parts by weight contaminated soils are taken, activated state lead content is 550mg/kg in soil, adds in 40 parts of mass fractions
For 0.3% chitosan solution, after stirring evenly, 70-90 DEG C stands baking 24-48 hours；
S2, configuration leacheate, the leacheate include the component of following parts by weight：
Water, 76 parts；
Little Hua gold is picked one's ears plain (4 β-acetoxyl group-puppet guainane -11 (13)-alkene -12,8 α-lactone), 2 parts；
Trishydroxymethylaminomethane, 2 parts；
Sodium alginate, 10 parts；
S3, it will be immersed in the leacheate that step 2 is configured through the soil that step 1 is handled, the matter of the soil and maintenance liquid
Amount is than being 8:1-2,60-80 DEG C are heated 12-24 hours, and separation of solid and liquid adds in maintenance liquid into soil, stirs evenly, and removal is more
Remaining moisture is completed to repair.
Wherein, maintenance liquid described in step 3 includes the component of following parts by weight：
Ethyl carbamoylphosphate salt, 5 parts；
Sour diethylaminoethanol ester, 10 parts；
Water, 40 parts.
Embodiment 2：
The restorative procedure of lead-contaminated soil, includes the following steps,
S1,15 parts by weight contaminated soils are taken, activated state lead content is 750mg/kg in soil, adds in 50 parts of mass fractions
For 0.6% chitosan solution, after stirring evenly, 70-90 DEG C stands baking 24-48 hours；
S2, configuration leacheate, the leacheate include the component of following parts by weight：
Water, 88 parts；
Little Hua gold is picked one's ears plain (4 β-acetoxyl group-puppet guainane -11 (13)-alkene -12,8 α-lactone), 6 parts；
Trishydroxymethylaminomethane, 5 parts；
Sodium alginate, 18 parts；
S3, it will be immersed in the leacheate that step 2 is configured through the soil that step 1 is handled, the matter of the soil and maintenance liquid
Amount is than being 8:1-2,60-80 DEG C are heated 12-24 hours, and separation of solid and liquid adds in maintenance liquid into soil, stirs evenly, and removal is more
Remaining moisture is completed to repair.
Wherein, it is 1-2% that maintenance liquid described in step 3, which is mass fraction, the phosphate buffer solution of pH=6-8.
Embodiment 3：
The restorative procedure of lead-contaminated soil, includes the following steps,
S1,15 parts by weight contaminated soils are taken, activated state lead content is 750mg/kg in soil, adds in 45 parts of mass fractions
For 0.4% chitosan solution, after stirring evenly, 70-90 DEG C stands baking 24-48 hours；
S2, configuration leacheate, the leacheate include the component of following parts by weight：
Water, 82 parts；
Little Hua gold is picked one's ears plain (4 β-acetoxyl group-puppet guainane -11 (13)-alkene -12,8 α-lactone), 4 parts；
Trishydroxymethylaminomethane, 3 parts；
Sodium alginate, 14 parts；
S3, it will be immersed in the leacheate that step 2 is configured through the soil that step 1 is handled, the matter of the soil and maintenance liquid
Amount is than being 8:1-2,60-80 DEG C are heated 12-24 hours, and separation of solid and liquid adds in maintenance liquid into soil, stirs evenly, and removal is more
Remaining moisture is completed to repair.
Maintenance liquid includes the component of following parts by weight described in step 3：
Ethyl carbamoylphosphate salt, 8 parts；
Sour diethylaminoethanol ester, 16 parts；
Water, 60 parts.
Embodiment 4：
With embodiment 3, the mass fraction of chitosan solution in 1 is only changed the step, remediating lead-contaminated soil,
A groups：The mass fraction of chitosan solution is 0.1%；
B groups：The mass fraction of chitosan solution is 0.9%.
Embodiment 5：
With embodiment 3, the composition of leacheate in 2 is only changed the step, remediating lead-contaminated soil,
A groups leacheate includes the component of following parts by weight：Water, 82 parts；Little Hua gold is picked one's ears, and element (more create by 4 β-acetoxyl group-puppet
Wooden alkane -11 (13)-alkene -12,8 α-lactone), 4 parts；Trishydroxymethylaminomethane, 3 parts；
B groups leacheate includes the component of following parts by weight：Water, 82 parts；Trishydroxymethylaminomethane, 3 parts；Sodium alginate,
14 parts.
Embodiment 6：
With embodiment 3,3 addition temperature is only changed the step, remediating lead-contaminated soil,
A groups：40℃；
B groups：100℃.
Embodiment 7：
With embodiment 3,3 operating method is only changed the step, the addition of maintenance liquid is omitted, completes remediating lead-contaminated soil
Earth.
Embodiment 8：
The removal rate of activated state lead in embodiment 1-7 rehabilitating soils is detected, the results are shown in Table 1：
The removal rate of 1 rehabilitating soil activated state lead of table
As shown in Table 1, most preferably a concentration of 0.3-0.6% of chitosan solution, concentration is too low or excessively high, can influence soil
Preprocessing process, the final removal rate for reducing lead；Little Hua gold earpick element, main component of the sodium alginate as leacheate are right
Synergistic effect is played in the removal of lead；Step 3 need to select suitable heating temperature, so as to improve the removal rate of lead.
Embodiment 9：
Soil that embodiment 3, embodiment 7 are repaired with fresh untainted soil in mass ratio 1:1 mixing, identical
Under the conditions of conserve 3 months, the variation of activated state lead in soil is detected, as a result such as table 2：
The concentration variation of activated state lead in 2 rehabilitating soil of table
As shown in Table 2, the addition of maintenance liquid so that the soil of reparation is more stablized.
It should be noted that above-described embodiment is only presently preferred embodiments of the present invention, there is no be used for limiting the present invention's
Protection domain, the equivalent replacement or replacement made on the basis of the above all belong to the scope of protection of the present invention.
Claims (8)
1. the restorative procedure of lead-contaminated soil, which is characterized in that include the following steps,
S1,15 parts by weight contaminated soils are taken, adds in the chitosan solution that 40-50 parts of mass fractions are 0.3-0.6%, stirring is equal
After even, 70-90 DEG C stands baking 24-48 hours；
S2, configuration leacheate, the leacheate include the component of following parts by weight：
Water, 76-88 parts；
Little Hua gold is picked one's ears plain (4 β-acetoxyl group-puppet guainane -11 (13)-alkene -12,8 α-lactone), 2-6 parts；
Trishydroxymethylaminomethane, 2-5 parts；
Sodium alginate, 10-18 parts；
S3, it will be immersed in the leacheate that step 2 is configured through the soil that step 1 is handled, heating a period of time, separation of solid and liquid, to
Maintenance liquid is added in soil, is stirred evenly, removes excessive moisture, completes to repair.
2. the restorative procedure of lead-contaminated soil as described in claim 1, which is characterized in that soil described in step 3 and maintenance liquid
Mass ratio be 8:1-2.
3. the restorative procedure of lead-contaminated soil as described in claim 1, which is characterized in that maintenance liquid described in step 3 include with
The component of lower parts by weight：
Ethyl carbamoylphosphate salt, 5-8 parts；
Sour diethylaminoethanol ester, 10-16 parts；
Water, 40-60 parts.
4. the restorative procedure of lead-contaminated soil as described in claim 1, which is characterized in that maintenance liquid described in step 3 is quality
Score is 1-2%, the phosphate buffer solution of pH=6-8.
5. the restorative procedure of lead-contaminated soil as described in claim 1, which is characterized in that heating condition is described in step 3：
60-80 DEG C is heated 12-24 hours.
6. the restorative procedure of lead-contaminated soil as described in claim 1, which is characterized in that leacheate described in step 3 include with
The component of lower parts by weight：
Water, 82 parts；
Little Hua gold is picked one's ears plain (4 β-acetoxyl group-puppet guainane -11 (13)-alkene -12,8 α-lactone), 4 parts；
Trishydroxymethylaminomethane, 3 parts；
Sodium alginate, 14 parts.
7. the restorative procedure of lead-contaminated soil as described in claim 1, which is characterized in that after the completion of the step 3, will repair
Soil and fresh untainted soil in mass ratio 1:1 mixing.
8. the restorative procedure of lead-contaminated soil as described in claim 1, which is characterized in that activated state in the contaminated soil
Lead content is in more than 550mg/kg.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711449325.8A CN108126977B (en) | 2017-12-27 | 2017-12-27 | Method for restoring lead polluted soil |
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| CN201711449325.8A CN108126977B (en) | 2017-12-27 | 2017-12-27 | Method for restoring lead polluted soil |
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| CN108126977B CN108126977B (en) | 2020-12-15 |
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