CN106623382A - Method for repairing organochlorine pesticide-polluted soil through microwave-enhanced sodium percarbonate - Google Patents
Method for repairing organochlorine pesticide-polluted soil through microwave-enhanced sodium percarbonate Download PDFInfo
- Publication number
- CN106623382A CN106623382A CN201611198378.2A CN201611198378A CN106623382A CN 106623382 A CN106623382 A CN 106623382A CN 201611198378 A CN201611198378 A CN 201611198378A CN 106623382 A CN106623382 A CN 106623382A
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- Prior art keywords
- soil
- sodium percarbonate
- microwave
- organochlorine pesticide
- polluted soil
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Classifications
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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
-
- 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
Abstract
The invention belongs to the technical field of organic polluted soil repairing engineering and discloses a method for repairing organochlorine pesticide-polluted soil through microwave-enhanced sodium percarbonate. The method comprises the steps of mixing the organochlorine pesticide-polluted soil into a mud-state soil mixture solution at a certain liquid-solid ratio, feeding a certain amount of surfactant, sodium percarbonate, sodium citrate and ferrous sulfate and carrying out microwave treatment and standing, wherein the degradation rate of an organochlorine pesticide in the soil can reach over 85%. The method has the advantages of being high in treatment efficiency, low in oxidant consumption, simple in process condition and low in operation requirements, and is suitable for the repairing of the organochlorine pesticide-polluted soil.
Description
Technical field
The invention belongs to organic polluted soil recovery technique field, and in particular to one kind is repaiied using microwave reinforced SODIUM PERCARBONATE
The method of multiple organochlorine pesticide pollution soil.
Background technology
Since《Convention of Stockholm》Signing and China implement " move back two and enter three " industrial policy enforcement, be heavily located at
The chemical plant of city or riparian area is closed or moves away from city, carries over after substantial amounts of contaminated site urgently administers and repair
Can put back into.The organo-chlorine pesticides such as BHC, DDT have the characteristics such as difficult degradation, high poison and high residue, certainly
It is difficult to be degraded by microorganisms or Natural Attenuation under the conditions of so, thus it is very long in the half-life of soil, residue in the organochlorine of soil
Still there are detection agricultural chemicals decades so that the contaminated soil carried over after the resettlement of organo-chlorine pesticide workshop becomes organic contamination
The difficulties in site remediation field.If organochlorine pesticide pollution soil, will be to environment and human body all without dealing carefully with
Serious potential hazard can be brought.
At present the conventional restorative procedure of organic polluted soil include thermal desorption, rotary kiln, chemical leaching, chemistry redox and
It is biological prosthetic etc..Organo-chlorine pesticide main component is typically difficult VOC, therefore thermal desorption effect on driving birds is not good；Revolution
The power consumption of kiln technology is higher and there are higher technical requirements to follow-up exhaust-gas treatment；Chemical leaching method is needed to follow-up drip washing
Waste liquid carries out to be discharged after advanced treating；Biological prosthetic efficiency is very slow, needs very long repair time to can be only achieved expected mesh
Mark.Chemical oxidization method is widely used in domestic and international high concentration organic contamination because having quick degradation capability to organic pollution
The reparation of place soil.Fenton reagent is the most frequently used oxidant, and classical Fenton reagent is made up of hydrogen peroxide and Fe (II),
Decomposed using Fe (II) catalyzing hydrogen peroxide and produce the extremely strong hydroxyl radical free radical (OH) of oxidisability, so as to realize to organic contamination
The degraded of thing.
However, there are problems that when repairing organochlorine pesticide pollution soil using classical Fenton reagent following：First, by
In organo-chlorine pesticide, primary attachment on the soil organism, exists so that Fenton reagent is in soil in ADSORPTION STATE form in soil
Contact effect on driving birds is not good in earth with organo-chlorine pesticide；Second, due to first rich in microorganism, Clay Minerals And Clay Oxides and transition metal in soil
Element so that hydrogen peroxide is possible to be broken down into oxygen and water in soil, so as to lose oxidisability；3rd, due to Fenton examination
Agent is often no selective to the Oxidative Degradation of organic pollution, for the content of organic matter is typically much higher than organo-chlorine pesticide
The soil of content, is easily caused a large amount of Fenton reagents and produces reaction with the soil organism, so as to waste substantial amounts of Fenton reagent.
Therefore, when repairing organochlorine pesticide pollution soil using Fenton process, it is necessary to overcome organo-chlorine pesticide and Fenton reagent
Contacting efficiency problem, to reduce decomposition of the Fenton reagent in soil and the reaction with the soil organism, so as to control
The waste problem of Fenton reagent.To solve problem above, it may be considered that substitute liquid hydrogen peroxide using SODIUM PERCARBONATE, pass through
Regulation and control SODIUM PERCARBONATE decomposition rate come regulate and control its release hydrogen peroxide speed.Simultaneously, it is necessary to promote organochlorine agriculture in soil
The desorption of medicine, so as to improve the contacting efficiency of organo-chlorine pesticide and Fenton reagent, it may be considered that promote soil using microwave technology
Organochlorine pollutant is changed into free state from ADSORPTION STATE in earth, while adding surfactant to promote organo-chlorine pesticide in liquid soil
Solubilising in phase, is Fenton reagent oxidative degradation organochlorine agriculture so as to improve contact effect of the Fenton reagent with organo-chlorine pesticide
Medicine creates favorable conditions, and realizes to the efficient degradation of organo-chlorine pesticide and rapidly and efficiently repairing to organochlorine pesticide pollution soil
It is multiple.
Study for many years through applicant, the invention discloses a kind of repair organo-chlorine pesticide using microwave reinforced SODIUM PERCARBONATE
The method of contaminated soil, it is possible to achieve the rapidly and efficiently reparation to the typical organochlorine pesticides contaminated soil such as DDT, BHC.
The content of the invention
The invention provides a kind of method that utilization microwave technology reinforcing SODIUM PERCARBONATE repairs organochlorine pesticide pollution soil,
Solve classical Fenton reagent in soil easily with the soil organism reaction, easily occur decomposition, Fenton reagent wastage compared with
Big the problems such as.The method has that degradation speed is fast, efficiency high, process conditions are simple and the advantage such as non-secondary pollution, can extensively answer
For the reparation of the organochlorine pesticide pollution soil such as DDT, BHC.
Specific operation scheme is as follows：Soil and water are mixed into into mud state soil mixed solution, by liquid-solid ratio and soil
PH value is controlled in certain limit, and in soil mixed solution a certain amount of SODIUM PERCARBONATE, sodium citrate and ferrous sulfate are added,
After microwaved and standing, the degradation rate of Organochlorine Pesticides In Soil can reach more than 85%.
Organochlorine Pesticides in the soil are more than 5mg/kg.
Described surfactant need to have preferably compatibility and non-secondary pollution risk with SODIUM PERCARBONATE, can adopt
The biodegradable surfactant such as tween, Qula be logical, dosage is the 1%～5% of soil quality.
Described SODIUM PERCARBONATE dosage is the 0.5%～2% of soil quality.
Described sodium citrate and ferrous sulfate dosage is usually the 0.1%～1% of soil quality.
Described microwave power is 100～750W.
Described microwave treatment time is 10～60 minutes, and time of repose is 3～24h.
In this reaction system, the effect of surfactant promotes solubilising of the organo-chlorine pesticide in liquid phase of soil.Microwave
Effect is the desorption for promoting soil organo-chlorine pesticide, is allowed to be changed into free state from ADSORPTION STATE, in soil organic solvent, from
And contact effect of the organo-chlorine pesticide with oxidant is improved, it is that oxidant organo-chlorine pesticide of fully degrading creates favorable conditions.Cross
The effect of sodium carbonate is that the Fe (II) for slowly controllably discharging in hydrogen peroxide, with ferrous sulfate constitutes Fenton reagent, Fe (II)
Catalyzing hydrogen peroxide produces the extremely strong hydroxyl radical free radical of oxidisability, realizes the degraded to organo-chlorine pesticide.The effect of sodium citrate
Including soil is kept, usually solution is in alkalescence, regulates and controls the decomposition rate of SODIUM PERCARBONATE, and be complexed Fe (II) to be oxidized what is produced
Fe (III), prevents Fe (III) from precipitating in the soil liquid, affects being smoothed out for class Fenton's reaction.
Specific embodiment
Below with reference to example, the present invention is further elaborated, but present invention application is not limited to this.
In example 1 and example 2 BHC in soil is processed using this method.Wherein, six or six for remaining in soil
Six, by ultrasonic extraction, quantitative determination are carried out using Shimadzu gas chromatograph to it.
Example 1：
Prepare 40mL mud state soil mixed liquor (soil 10g, in soil BHC content be 50mg/kg, addition go from
Sub- water 40mL, makes water and soil mass ratio be 4:1) Tween 80 of 0.2g, is added in mixed liquor, then successively adds 0.1g percarbonic acids
The ferrous sulfate of sodium, 0.05 gram of sodium citrate and 0.05g.Mud state soil mixed liquor is put in microwave chemical reactor,
Microwave power is set to 200W, and after 30 minutes, the degraded hexachloro cyclohexane rate in soil has reached more than 85%.
Example 2：
(soil 10g, BHC content is 100mg/kg to the mud mixed liquor of configuration 50mL in soil, adds deionized water
50mL, makes water and soil mass ratio be 5:1) Triton X-100 of 0.25g, is added in mixed liquor, then successively adds 0.2g percarbonic acids
The ferrous sulfate of sodium, 0.1 gram of sodium citrate and 0.1g.The mud state soil liquid is put into into microwave chemical reactor, microwave work(
Rate is set to 300W, and through the reaction of 20 minutes, the degraded hexachloro cyclohexane rate in soil reached more than 90%.
Claims (8)
1. a kind of method that microwave reinforced SODIUM PERCARBONATE repairs organochlorine pesticide pollution soil, its feature is comprised the following steps：
Organochlorine pesticide pollution soil makes mud state soil mixed solution, add a certain amount of citric acid, nano ferriferrous oxide and
SODIUM PERCARBONATE, after microwaved and standing, the organo-chlorine pesticide degradation rate in soil can reach more than 85%.
2. method according to claim 1, it is characterised in that the content of BHC is more than 5mg/kg in the soil.
3. method according to claim 1, it is characterised in that the solid mass ratio of the liquid of mud state soil mixed solution is 2:1
～10:1.
4. method according to claim 1, it is characterised in that the surfactant dosage is the 1% of soil quality
～5%.
5. method according to claim 1, it is characterised in that the SODIUM PERCARBONATE dosage is the 0.5% of soil quality
～2%.
6. method according to claim 1, it is characterised in that the sodium citrate and ferrous sulfate dosage are soil matter
The 0.1%～1% of amount.
7. method according to claim 1, it is characterised in that it is 100～750W that microwave power is microwave power.
8. method according to claim 1, it is characterised in that microwave treatment time is 10～60m, time of repose is 3～
24h。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611198378.2A CN106623382A (en) | 2016-12-22 | 2016-12-22 | Method for repairing organochlorine pesticide-polluted soil through microwave-enhanced sodium percarbonate |
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|---|---|---|---|
| CN201611198378.2A CN106623382A (en) | 2016-12-22 | 2016-12-22 | Method for repairing organochlorine pesticide-polluted soil through microwave-enhanced sodium percarbonate |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108690632A (en) * | 2018-07-02 | 2018-10-23 | 中国石油天然气集团有限公司 | A kind of soil pollution remediation composition and its application |
| CN110918631A (en) * | 2019-11-19 | 2020-03-27 | 西北农林科技大学 | Chemical oxidation soil remediation method under microwave reinforcement |
| CN111097791A (en) * | 2019-12-30 | 2020-05-05 | 苏州同和环保工程有限公司 | Remediation method for pesticide-contaminated soil |
| CN112139236A (en) * | 2020-09-17 | 2020-12-29 | 南开大学 | Method for restoring pesticide-polluted soil by using microwave-enhanced Fenton oxidation technology |
| CN113440787A (en) * | 2020-08-15 | 2021-09-28 | 中国农业大学 | Pesticide degradation agent and application thereof |
| CN115722529A (en) * | 2022-11-17 | 2023-03-03 | 南开大学 | Method for promoting Fenton reaction to repair organic contaminated soil by microwave slow-release material |
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| CN103894407A (en) * | 2014-03-24 | 2014-07-02 | 华南理工大学 | Method for repairing heavy metal contaminated soil |
| CN105457996A (en) * | 2015-12-18 | 2016-04-06 | 广东工业大学 | Method for remediating organic-contaminated place soil by using microwave in collaboration with sodium percarbonate |
| CN105855287A (en) * | 2016-05-30 | 2016-08-17 | 湖南恒凯环保科技投资有限公司 | Method for ex-situ remediation of organic contaminated soil by virtue of sodium percarbonate-biological pile technique |
| CN106077076A (en) * | 2016-07-11 | 2016-11-09 | 陕西师范大学 | A kind of based on SODIUM PERCARBONATE oxidation and microbial augmentation integrated treatment soil with serious petroleum pollution or the method for greasy filth |
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| CN106140807A (en) * | 2016-07-29 | 2016-11-23 | 高建国 | A kind of dinitrotoluene (DNT) Contaminated Sewage Sludge inorganic agent and preparation method thereof |
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| CN103894407A (en) * | 2014-03-24 | 2014-07-02 | 华南理工大学 | Method for repairing heavy metal contaminated soil |
| CN105457996A (en) * | 2015-12-18 | 2016-04-06 | 广东工业大学 | Method for remediating organic-contaminated place soil by using microwave in collaboration with sodium percarbonate |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108690632A (en) * | 2018-07-02 | 2018-10-23 | 中国石油天然气集团有限公司 | A kind of soil pollution remediation composition and its application |
| CN110918631A (en) * | 2019-11-19 | 2020-03-27 | 西北农林科技大学 | Chemical oxidation soil remediation method under microwave reinforcement |
| CN111097791A (en) * | 2019-12-30 | 2020-05-05 | 苏州同和环保工程有限公司 | Remediation method for pesticide-contaminated soil |
| CN113440787A (en) * | 2020-08-15 | 2021-09-28 | 中国农业大学 | Pesticide degradation agent and application thereof |
| CN113440787B (en) * | 2020-08-15 | 2022-07-01 | 中国农业大学 | Pesticide degradation agent and application thereof |
| CN112139236A (en) * | 2020-09-17 | 2020-12-29 | 南开大学 | Method for restoring pesticide-polluted soil by using microwave-enhanced Fenton oxidation technology |
| CN115722529A (en) * | 2022-11-17 | 2023-03-03 | 南开大学 | Method for promoting Fenton reaction to repair organic contaminated soil by microwave slow-release material |
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