CN109967513A - A kind of ELUTION METHOD for repairing cationic and anionic Compound Heavy Metals soil - Google Patents
A kind of ELUTION METHOD for repairing cationic and anionic Compound Heavy Metals soil Download PDFInfo
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- CN109967513A CN109967513A CN201910231676.4A CN201910231676A CN109967513A CN 109967513 A CN109967513 A CN 109967513A CN 201910231676 A CN201910231676 A CN 201910231676A CN 109967513 A CN109967513 A CN 109967513A
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- cationic
- leacheate
- soil
- heavy metal
- anionic
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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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- 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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- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a kind of ELUTION METHODs for repairing cationic and anionic Compound Heavy Metals soil, this method desorbs contaminated soil cationic and anionic heavy metal as eluent using polyphosphate simultaneously, then the pH value of the leacheate after separation of solid and liquid is adjusted to 2-4, ferrous sulfide is added and removes cationic and anionic heavy metal in leacheate simultaneously, the polyphosphate is the combination of one or more of sodium tripolyphosphate, sodium tetrapolyphosphate, potassium tripolyphosphate and four PA 800Ks.The method overcome the deficiencies that current most of chemical leachings are only applicable to single type heavy metal pollution, it is easy to operate simultaneously, its used medicament have many advantages, such as it is cheap, environmental-friendly and to soil matrix destroy it is small, Compound Heavy Metals soil remediation application in can take into account economic benefit and environmental benefit.
Description
Technical field
The invention belongs to soil pollutions to repair field, and in particular to cationic and anionic Compound Heavy Metals soil
The ELUTION METHOD of earth.
Background technique
With the growth of China human mortality and the fast development of economic society, the discharge of solid waste, agricultural chemicals
Be excessively used, mining and sewage irrigation etc. cause heavy metal pollution of soil to get worse, to human health and ecological environment
It constitutes a serious threat, needs effectively to be repaired.Most of heavy-metal contaminated soils have combined pollution feature, comprising sun from
Subtype heavy metal (such as cadmium, lead and copper are mainly present in soil media with cationic form) and anionic heavy metal is (such as
Chromium and arsenic are mainly present in soil media in the form of oxo-anions).
Gu the main recovery technique of currently used Compound Heavy Metals soil include phytoremediation, chemical stabilization/
Fixedization and chemical leaching.Chemical leaching recovery technique is by heavy metal using the interaction between eluent and heavy metal from soil
Medium is transferred in aqueous media, then by being separated by solid-liquid separation the heavy metal completely removed in soil.With chemical stabilization/fixation
Change recovery technique to compare, chemical leaching can effectively avoid the risk that heavy metal leaches again.Compared with phytoremediation, chemical leaching
The soil that various concentration heavy metal pollution can quickly be repaired, is influenced smaller by environmental factor.
Soil chemistry elution mainly includes the selection of eluent and post-processing two parts of leacheate.The wherein choosing of eluent
Select be soil chemistry elution core, directly affect the removal efficiency of heavy metal in soil.Soil chemistry elutes main needle at present
To the heavy metal of single type, such as common heavy metal leaching agent EDTA is only capable of effectively desorbing cationic heavy metal in soil,
And heavy metal leaching agent phosphate is only capable of effectively desorbing anion heavy metal arsenic.It is, thus, sought for Polluted Soil can be desorbed simultaneously
The eluent of cationic and anionic heavy metal in earth.In addition, the post-processing of leacheate is also the weight of soil chemistry elution
Want link.The post-processing of leacheate mainly uses the precipitation method at present.The pH of leacheate is adjusted to by the precipitation method usually using soda lime
Alkalinity, thus convert hydroxide precipitating for the cationic heavy metal in leacheate and be removed, but alkaline condition is anti-
And promote the dissolution of anionic heavy metal arsenic.So cationic and anionic in leacheate can be removed simultaneously by needing to explore
The processing method of heavy metal.
Summary of the invention
The object of the present invention is to provide one kind for repairing cationic and anionic Compound Heavy Metals soil
The ELUTION METHOD of earth, this method include desorbing cationic and yin in contaminated soil simultaneously as eluent using polyphosphate
Ionic heavy metal, be then added in the leacheate after separation of solid and liquid ferrous sulfide remove in leacheate simultaneously cationic and
Anionic heavy metal.
Technical principle of the invention: on the one hand polyphosphate radical can form stable solubilised state with cationic heavy metal
Complex compound, to promote the desorption of cationic heavy metal in contaminated soil, on the other hand can by with arsenate and chromic acid
The mode of adsorption site promotes the desorption of Anions In Soils type heavy metal arsenic and chromium on root competition soil particle.It is being separated by solid-liquid separation
Ferrous sulfide is added in leacheate afterwards, ferrous sulfide can discharge sulphion and ferrous ion, sulphion in acid condition
Sulfide precipitation is formed with cationic heavy metal and removes the cationic heavy metal in leacheate, is disappeared with hydrionic
Consumption, the pH of leacheate are gradually increased, and ferrous ion gradates FeOOH, and FeOOH is gone by way of co-precipitation
Except the anionic heavy metal in leacheate.
To achieve the goals above, the invention adopts the following technical scheme:
A kind of ELUTION METHOD for repairing cationic and anionic Compound Heavy Metals soil: polyphosphate is used
Contaminated soil cationic and anionic heavy metal are desorbed simultaneously as eluent, then by the leacheate after separation of solid and liquid
PH value is adjusted to 2-4, and ferrous sulfide is added and removes cationic and anionic heavy metal in leacheate simultaneously.
Further, the cationic heavy-metal contaminated soil contains one or more of copper, lead, zinc and cadmium,
The anionic heavy metal contains one or both of arsenic and chromium.
Further, the polyphosphate is sodium tripolyphosphate, sodium tetrapolyphosphate, potassium tripolyphosphate and four polyphosphoric acids
Polyphosphate soln is passed through the pillar of filling contaminated soil, or uses mechanical stirring by the combination of one or more of potassium
Or the mode of oscillation mixes polyphosphate soln and contaminated soil.
Further, ferrous sulfide is added in leacheate, mechanical stirring or oscillation 4-8 hours, make compound in leacheate
Heavy metal is sufficiently removed.
Further, inorganic acid is selected to adjust the pH value of leacheate, the inorganic acid is hydrochloric acid, sulfuric acid or nitric acid.
The present invention, can be to polyphosphate and ferrous sulfide for the difference of Compound Heavy Metals concentration in contaminated soil
The parameters such as dosage, mixing speed and reaction time optimize adjustment.
Compared with prior art, the present invention has the following advantages and beneficial effects:
(1) chemical leaching method of the present invention can effectively repair cationic and anionic Compound Heavy Metals
Soil overcomes the shortcomings of that current most of chemical leachings are only applicable to single type heavy metal pollution.
(2) chemical leaching method of the present invention is easy to operate, and used medicament is with cheap, environment is friendly
The advantages that good and small to soil matrix destruction, economic benefit and environmental benefit can be taken into account in actual application.
Specific embodiment
Embodiment 1
Compound Heavy Metals soil is acquired from Daye City, periphery, mining area, wherein lead concentration is 355.5mg/kg, and copper is dense
Degree is 591.9mg/kg, arsenic concentration 86.8mg/kg.By the sodium tetrapolyphosphate (pH is adjusted to 7.0) and contaminated soil of 0.2mol/L
It is mixed in glass tube by the mass ratio of 1:10, glass tube is placed in constant temperature oscillator, temperature is 25 DEG C, and oscillation rate is
Mud-water separation is carried out using supercentrifuge after 120r/min, isothermal vibration 72h.After elution in soil lead, copper and arsenic concentration
Respectively 38.4,43.8 and 18.5mg/kg, the removal rate for corresponding to three heavy metal species in soil is respectively 89.2%, 92.6% and
78.7%.The concentration of lead, copper and arsenic is respectively 31.7,54.8 and 6.83mg/L in leacheate.Under the same reaction conditions, it commonly uses
Heavy metal leaching agent EDTA (initial concentration 0.2mol/L, initial pH=7.0) to the removal rate point of lead, copper and arsenic in soil
It Wei 91.4%, 88.9% and 18.4%.The result shows that sodium tetrapolyphosphate imitates the desorption of cationic heavy metal (lead and copper)
Rate is substantially suitable with EDTA, but sodium tetrapolyphosphate is significantly higher than EDTA to the desorption efficiency of anionic heavy metal arsenic, to arsenic
Desorption efficiency be 4.3 times of EDTA.
1g ferrous sulfide is added in 100mL leached soil solutions, and the pH of leacheate is adjusted to 2.5 with dilute sulfuric acid.Using
Mechanical stirring mixes leacheate and ferrous sulfide, revolving speed 300r/min, and mixing time is 8 hours, and supernatant is measured after centrifugation
The concentration of middle heavy metal lead, copper and arsenic is respectively 0.3,1.5 and 0.4mg/L, the removal rate of three heavy metal species in corresponding leacheate
Respectively 99.1%, 97.2% and 94.1%.
Embodiment 2
Compound Heavy Metals soil is acquired near Wuhan electroplate factory sewage ditch, wherein cadmium content is 26.8mg/kg,
Lead content is 69.8mg/kg, chromium content 96.8mg/kg.By the sodium tetrapolyphosphate (pH is adjusted to 7.0) and Polluted Soil of 0.1mol/L
Earth is mixed in glass tube by the mass ratio of 1:10, and glass tube is placed in constant temperature oscillator, and temperature is 25 DEG C, and oscillation rate is
Mud-water separation is carried out using supercentrifuge after 120r/min, isothermal vibration 72h.After elution in soil cadmium, lead and chromium concentration
Respectively 3.7,5.1 and 9.8mg/kg, the removal rate for corresponding to three heavy metal species in soil is respectively 86.2%, 92.7% and
89.9%.The concentration of cadmium, lead and chromium is respectively 2.3,6.5 and 8.7mg/L in leacheate.Under the same reaction conditions, commonly
Heavy metal leaching agent EDTA (initial concentration 0.1mol/L, initial pH=7.0) distinguishes the removal rate of cadmium, lead and chromium in soil
It is 82.4%, 89.9% and 23.7%.The result shows that desorption efficiency of the sodium tetrapolyphosphate to cationic heavy metal (cadmium and lead)
Slightly above EDTA.Meanwhile sodium tetrapolyphosphate is significantly higher than EDTA to the desorption efficiency of anionic heavy metal chromium, to the solution of chromium
Inhale 3.8 times that efficiency is EDTA.
0.2g ferrous sulfide is added in 100mL leached soil solutions, and the pH of leacheate is adjusted to 2.5 with dilute sulfuric acid.It adopts
Leacheate and ferrous sulfide, revolving speed 300r/min are mixed with mechanical stirring, mixing time is 4 hours, and supernatant is measured after centrifugation
The concentration of heavy metal cadmium, lead and chromium is respectively 0.1,0.2 and 0.6mg/L in liquid, the removal of three heavy metal species in corresponding leacheate
Rate is respectively 95.7%, 96.9% and 93.1%.
Claims (5)
1. a kind of ELUTION METHOD for repairing cationic and anionic Compound Heavy Metals soil, which is characterized in that use
Polyphosphate desorbs contaminated soil cationic and anionic heavy metal simultaneously as eluent, after being then separated by solid-liquid separation
The pH value of leacheate be adjusted to 2-4, ferrous sulfide is added and removes cationic and anionic heavy metal in leacheate simultaneously.
2. ELUTION METHOD according to claim 1, which is characterized in that the cationic heavy-metal contaminated soil contains
One or more of copper, lead, zinc and cadmium, the anionic heavy-metal contaminated soil contain one of arsenic and chromium or two
Kind.
3. ELUTION METHOD according to claim 1, which is characterized in that the polyphosphate is sodium tripolyphosphate, four
The combination of one or more of polyphosphate sodium, potassium tripolyphosphate and four PA 800Ks.
4. ELUTION METHOD according to claim 1, which is characterized in that ferrous sulfide is added in leacheate, mechanical stirring
Or oscillation 4-8 hours, it is sufficiently removed Compound Heavy Metals in leacheate.
5. ELUTION METHOD according to claim 1, which is characterized in that select inorganic acid to adjust the pH value of leacheate, it is described
Inorganic acid be hydrochloric acid, sulfuric acid or nitric acid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910231676.4A CN109967513B (en) | 2019-03-25 | 2019-03-25 | Leaching method for repairing cation type and anion type composite heavy metal polluted soil |
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| CN201910231676.4A CN109967513B (en) | 2019-03-25 | 2019-03-25 | Leaching method for repairing cation type and anion type composite heavy metal polluted soil |
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| CN109967513B CN109967513B (en) | 2020-12-08 |
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Cited By (5)
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| CN112122325A (en) * | 2020-08-03 | 2020-12-25 | 广州润方环保科技有限公司 | Arsenic-polluted soil eluting agent and preparation method and application thereof |
| CN112570440A (en) * | 2020-10-16 | 2021-03-30 | 中南安全环境技术研究院股份有限公司 | Method for restoring Cd-Pb-Cr (VI) composite contaminated soil |
| CN113058993A (en) * | 2021-04-08 | 2021-07-02 | 中铝环保节能集团有限公司 | Repairing agent for repairing lead, arsenic and cadmium combined polluted soil and repairing method thereof |
| CN113182338A (en) * | 2021-04-25 | 2021-07-30 | 三明学院 | Method for restoring molybdenum-polluted soil by ultrasonic/oscillation-assisted chemical leaching |
| CN115351060A (en) * | 2022-08-22 | 2022-11-18 | 广东环境保护工程职业学院 | Compound eluting agent, preparation method thereof and application thereof in removing cadmium and lead in soil |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112122325A (en) * | 2020-08-03 | 2020-12-25 | 广州润方环保科技有限公司 | Arsenic-polluted soil eluting agent and preparation method and application thereof |
| CN112570440A (en) * | 2020-10-16 | 2021-03-30 | 中南安全环境技术研究院股份有限公司 | Method for restoring Cd-Pb-Cr (VI) composite contaminated soil |
| CN112570440B (en) * | 2020-10-16 | 2022-08-05 | 中南安全环境技术研究院股份有限公司 | Method for restoring Cd-Pb-Cr (VI) composite contaminated soil |
| CN113058993A (en) * | 2021-04-08 | 2021-07-02 | 中铝环保节能集团有限公司 | Repairing agent for repairing lead, arsenic and cadmium combined polluted soil and repairing method thereof |
| CN113058993B (en) * | 2021-04-08 | 2023-09-05 | 中铝环保节能集团有限公司 | Repairing agent for repairing lead, arsenic and cadmium combined polluted soil and repairing method thereof |
| CN113182338A (en) * | 2021-04-25 | 2021-07-30 | 三明学院 | Method for restoring molybdenum-polluted soil by ultrasonic/oscillation-assisted chemical leaching |
| CN115351060A (en) * | 2022-08-22 | 2022-11-18 | 广东环境保护工程职业学院 | Compound eluting agent, preparation method thereof and application thereof in removing cadmium and lead in soil |
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| CN109967513B (en) | 2020-12-08 |
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