CN106734163A - A kind of method of utilization nano zero valence iron/potassium ferrate combine d bioremediation soil polluted by organic chloride - Google Patents
A kind of method of utilization nano zero valence iron/potassium ferrate combine d bioremediation soil polluted by organic chloride Download PDFInfo
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- CN106734163A CN106734163A CN201611199336.0A CN201611199336A CN106734163A CN 106734163 A CN106734163 A CN 106734163A CN 201611199336 A CN201611199336 A CN 201611199336A CN 106734163 A CN106734163 A CN 106734163A
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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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- Environmental & Geological Engineering (AREA)
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Abstract
The invention belongs to organic polluted soil recovery technique field, disclose a kind of nano zero valence iron collaboration potassium ferrate and repair organochlorine contamination place method.The method is mixed into mud state soil mixed solution by the way that soil polluted by organic chloride is stirred according to certain soil ratio, regulation pH value, add a certain proportion of nano zero valence iron and potassium ferrate, 6~24h is vibrated under normal temperature in constant temperature oscillator, organochlorine such as degraded hexachloro cyclohexane rate after treatment reach more than 70%.The present invention has the advantages that process conditions are simple, operate and require that low and treatment effeciency is high, it is adaptable to soil polluted by organic chloride reparation.
Description
Technical field
The invention belongs to contaminated site recovery technique field, and in particular to one kind is joined using nano zero valence iron and potassium ferrate
The method for closing organochlorine in degraded soil.
Background research
Organo-chlorine pesticide (OCPs) such as BHC, DDT, hexachloro-benzene and heptachlor are that the important difficult degradation of a class is organic
Pollutant.Because its high residue, eco-toxicity high and Johnson ＆ Johnson's thing residual are subject to the extensive concern in the world, and it is put into《This
De Geermo pacts》First batch of control 12 kinds of pollutants.Organochlorine is easily fat-soluble strong because of its, and hydrophobicity is easily adsorbed in soil by force
On the deposit in river.Include air- extraction, burning method, curing/stabilizing, life currently for the existing biodegrading process of organochlorine
Thing degraded, chemical oxidation, electronation and chemical leaching etc..Air- extraction is although convenient and swift, but in being only applicable organochlorine easily
Volatile pollutants, burning method is a kind of original biodegrading process, but is likely to result in secondary pollution；Biodegradable repairing efficiency is very long
It is affected by environment larger；Chemical leaching can not organochlorine in degradable soil；Therefore chemical oxidization method is because it is to organic dirt
Dye thing degradation rate is fast and has more thoroughly obtained extensive research in field of Environment Protection.
Conventional oxidant is including Fenton reagent, ozone, potassium permanganate, persulfate, ferrate etc. in chemical oxidization method.
Fe (VI) wherein in ferrate is with very strong oxidisability, and the catabolite of ferrate is mainly Fe (III), without two
Secondary pollution, therefore be a kind of good environment-friendly type oxidant.
However, most of oxidants are poor to the dealuminated USY cataluyst ability of organochlorine pollutant, and electronation technology is to having
The dechlorination ability of machine cl contaminant is stronger, but rate of reduction is slower, and degraded is not thorough, is also easy to produce poisonous middle product
Thing.Nowadays more scholar using nano zero valence iron as soil organochlorine dechlorination agent, can effectively to soil in have
Machine chlorine carries out reduction dechlorination, has been widely used in sewage and soil organochlorine contamination site remediation.
Analyzed with reference to more than, it is degradable by first carrying out dechlorination to organochlorine pollutant using chemical reduction method
A part of organochlorine pollutant, the further oxidative degradation of dechlorination product of Fe (VI) in potassium ferrate to organochlorine, then
It is expected to realize the quick thorough degraded to organochlorine pollutant.
Present invention applicant discloses a kind of using nano zero valence iron joint potassium ferrate drop on the basis of studying for many years
The method of organochlorine, realizes the efficient quick reparation to soil polluted by organic chloride in solution soil.
The content of the invention
The invention provides the method for organochlorine in a kind of utilization nano zero valence iron joint potassium ferrate rehabilitating soil, can be wide
The general degraded for being applied to Organochlorine Pesticides In Soil, such as BHC, DDT and hexachloro-benzene.
Concrete scheme of the present invention is as follows：
By adding a certain amount of nano zero valence iron and ferric acid in the soil polluted by organic chloride to certain pH and liquid-solid ratio
Constant temperature oscillator is put under potassium, normal temperature, 6~24h is vibrated, the soil organic chlorine degradation rate after treatment is up to more than 70%.
Content of organic chloride is 5~50mg/kg in described soil.
Described pH is in 2~5.
Described mud state soil ratio is 2:1~10:1.
Described nano zero valence iron and potassium ferrate dosage are 10~500 times of organochlorine molal quantity in reaction system.
Described constant temperature oscillation case rotating speed is 180r/min.
Nano zero valence iron effect is to carry out dechlorination to the organochlorine in soil in the present invention.
The effect of potassium ferrate is to carry out oxidative degradation to the organochlorine and its intermediate product in soil in the present invention.
Compared with other technologies, most outstanding feature is to employ nano zero valence iron joint potassium ferrate degraded to the present invention
Organochlorine in soil, and optimal degraded formula is determined.
Specific embodiment
Below in conjunction with instantiation, the present invention is further described, but embodiments of the present invention not limited to this.
BHC contaminated soil is processed using nano zero valence iron joint potassium ferrate in example 1 and example 2, its
In, the BHC remained in soil carries out quantitative determination by gas chromatograph.
Example 1:
It is 30 grams of the soil of 50mg/kg to prepare hexachlorobenzene content, is distributed into three conical flasks in a, b, c, while plus
Enter 50mL water, form mud state soil mixed liquor.It is 3 using hydrochloric acid and NaOH regulation system pH, in soil mixed liquor a
Add 48mg nano zero valence irons and 170mg potassium ferrates；To only adding 48mg nano zero valence irons in mud state soil mixed liquor；To
170mg potassium ferrates are only added in mud state soil mixed liquor.Under normal temperature, it is put into constant temperature oscillation case and is vibrated with 180r/min
24h.After reaction terminates, appropriate isopropanol quenching reaction is separately added into, extracts the hexachloro-benzene in soil using ultrasonic method, and utilize
Gas-chromatography quantitative determination hexachlorobenzene content.Result shows that the degradation rate of hexachloro-benzene is 70% in reaction system a soil, reaction
The degradation rate of hexachloro-benzene is 26% in soil in system b, and the degradation rate of soil hexachloro-benzene is 49% in reaction system c.
Example 2:
BHC content is prepared for 30 grams of the soil of 40mg/kg is divided equally in two conical flasks a, b, c, 40mL is separately added into
Water forms mud state soil mixed liquor.It is 4 to reconcile system pH using hydrochloric acid and NaOH, in mud state soil mixed liquor a
Add 39mg nano zero valence irons and 132mg potassium ferrates；To adding 39mg nano zero valence irons in mud state soil mixed liquor b；To
132mg potassium ferrates are added in mud state soil mixed liquor c.Under normal temperature, while being shaken with 180r/min in being put into constant temperature oscillation case
Swing 24h.After reaction terminates, appropriate isopropanol quenching reaction is separately added into, the BHC in soil, and profit are extracted using ultrasonic method
With gas-chromatography quantitative determination α-BHC content.Result shows that the degradation rate of soil BHC is 68% in reaction system a,
Soil degraded hexachloro cyclohexane rate is 24% in reaction system b, and soil degraded hexachloro cyclohexane rate is 53% in reaction system c.
Interpretation of result：Experiment finds, when between controlling pH for 3~4, is used alone in nano zero valence iron degraded soil
Organic chlorine degradation rate is only 25% or so, and the degradation rate of 24h of potassium ferrate rehabilitating soil organochlorine is used alone for 50% is left
The right side, but using the organochlorine in nano zero valence iron collaboration potassium ferrate rehabilitating soil, the degradation rate of 24h is 70% or so, this table
Bright nano zero valence iron joint potassium ferrate can well promote the degraded of organochlorine in soil.
Claims (5)
1. a kind of method of utilization nano zero valence iron/potassium ferrate combine d bioremediation soil polluted by organic chloride, its feature includes following
Step：Mud state is made with certain soil ratio by soil polluted by organic chloride, add a certain proportion of nano zero valence iron and
Potassium ferrate, vibrates under normal temperature in constant temperature oscillator, and the degradation rate of the organochlorine after treatment reaches more than 70%.
2. method according to claim 1, it is characterised in that the content of organochlorine is 5~50mg/kg in the soil.
3. method according to claim 1, it is characterised in that the nano zero valence iron dosage is soil organochlorine mole
Several 10~500 times.
4. method according to claim 1, it is characterised in that the potassium ferrate dosage is organochlorine mole in soil
10~500 times of number.
5. method according to claim 1, it is characterised in that the temperature of the constant temperature oscillator is normal temperature, rotating speed is
180r/min。
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107089718A (en) * | 2017-06-02 | 2017-08-25 | 常州大学 | A kind of nanometer Fe3O4/CaO2The method for repairing PAEs polluted underground waters |
| CN107214188A (en) * | 2017-06-02 | 2017-09-29 | 常州大学 | A kind of method of BHC in potassium ferrate collaboration calper calcium peroxide degraded soil elution liquid |
| CN110015741A (en) * | 2019-04-28 | 2019-07-16 | 哈尔滨工业大学 | A method of water pollutant is removed using nano zero valence iron and ferrate compound action |
| CN110695080A (en) * | 2019-11-20 | 2020-01-17 | 中国科学院南京土壤研究所 | Method for removing organochlorine compounds in soil through enhanced advanced oxidation and cooperative electrokinetic remediation of chelating agent |
| CN117427994A (en) * | 2023-10-16 | 2024-01-23 | 北京市生态环境保护科学研究院 | Method for repairing aged hexachlorobenzene contaminated soil by using nano zero-valent iron |
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| CN117427994A (en) * | 2023-10-16 | 2024-01-23 | 北京市生态环境保护科学研究院 | Method for repairing aged hexachlorobenzene contaminated soil by using nano zero-valent iron |
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