CN101596542B - Method for remedying DDT polluted soil by ultrasonic wave - Google Patents
Method for remedying DDT polluted soil by ultrasonic wave Download PDFInfo
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- CN101596542B CN101596542B CN2009100326908A CN200910032690A CN101596542B CN 101596542 B CN101596542 B CN 101596542B CN 2009100326908 A CN2009100326908 A CN 2009100326908A CN 200910032690 A CN200910032690 A CN 200910032690A CN 101596542 B CN101596542 B CN 101596542B
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Abstract
The invention belongs to the organic polluted soil remediation field, and discloses a method for remedying DDT polluted soil by ultrasonic wave. The method comprises the following steps: organic polluted soil slurry in which the water content is 15%-95% and the initial concentration of the DDT is 100-100000mu g/kg is treated on the condition of ultrasonic irradiation, while the ultrasonic frequency is 20kHz-500kHz, the ultrasonic power is 50W-2.0kw, and the ultrasonic irradiation time is 1min-2h. In the invention, the cavitation effect and perturbation effect of the ultrasonic wave are used for degrading or reducing organic chloride pesticide pollutant in the soil like DDT. The method uses pumps to continuously transport soil slurry to ultrasonic reaction equipment, thus being easy for remediation of the polluted soil in site. Compared with the prior art in remediation of organic chloride pesticide polluted soil, the method in the invention is nearly not affected by pollutant categories and environmental condition, thus being applied in a wide range. The method has advantages of high efficiency, low consumption, low risk of secondary pollution, strong maneuverability and good social benefit and environmental benefit.
Description
Technical field
The present invention relates to a kind ofly, particularly be subjected to the reparation of DDT organochlorine pesticide pollution soil such as (DDT, another name are 2, two (the 4-chlorphenyls)-1,1 of 2-, 1-trichloroethanes) being subjected to the restorative procedure of organic material contaminated soil.
Background technology
DDT lists one of 12 kinds of persistence organic pollutants (Persistent Organic Pollutants is called for short POPs) in " about the Convention of Stockholm of persistence organic pollutant " in the first batch in.As the big classification of POPs, organo-chlorine pesticide is that people are invested in initiatively that use amount in the environment is big, a strong toxicity and pollution class chemical pollutant widely.DDT is as the typical case of organo-chlorine pesticide representative, and China once produced in a large number and uses in 60～eighties of 20th century, and about more than 40 ten thousand tons of accumulative total consumption accounts for 20% of international consumption.The persistence of DDT and biological accumulation have determined it that health and ecological environment are had very big harm.Studies show that DDT has neurotoxicity, hepatotoxicity and Reproductive and developmental toxicity, can influence the endocrine function of organism, have typical three intoxicatings.
Because the use of DDT is controlled, the DDT residual quantity is existing in China's soil obviously descends, but some regional residual quantities still are in higher level.Find in different agricultural land soil DDT residual quantities detect to the Ningbo City in orchard and the non-irrigated grain ground soil that the high-load of disposable DDT is 5.64mg/kg and 3.37mg/kg, above 4.64 times and 2.37 times of national soil environment quality grade III Standard.
The recovery technique of DDT contaminated soil mainly comprises physics method, electronation dechlorinating process, chemical oxidization method, mechanochemical reaction, bioanalysis etc.The physics recovery technique easily causes secondary pollution; The chemistry recovery technique often relates to needs expensive economy input, and has been subjected to certain limitation when concrete the application; The bioremediation technology time is longer; The mechanochemistry technology provides a kind of new way and new method for repairing organochlorine pesticide pollution soil.But DDT environment remediation technology majority does not reach ripe stage, and the technology that is successfully applied to engineering practice is fewer.How to research and develop new treatment effeciency height, workable, safe technology, will become emphasis of future research.
Summary of the invention
In order to solve the high secondary pollution risk that exists in the existing soil remediation technology, the shortcoming that operating cost is higher and the processing cycle is long, the invention provides a kind of method of remedying DDT polluted soil by ultrasonic wave, have that the secondary pollution risk is little, efficient low-consume and a workable advantage.
A kind of method of remedying DDT polluted soil by ultrasonic wave is that the organic polluted soil slurry that water content is 15%～95%, DDT concentration is 100～100000 μ g/kg is handled under the ultrasonic irradiation condition; Supersonic frequency is 20kHz～500kHz, and ultrasonic power is 50W～2.0kw; The ultrasound wave irradiation time is 1min～2h.
The described ultrasound wave irradiation time, DDT in 1-30min removed the efficient height.
Described water content is preferred 40%wt～95%wt, and treatment effect is better, and water content is too low, and treatment effect is not obvious; The water content of organic polluted soil slurry during greater than 60%wt the DDT removal effect obvious.
The method of described remedying DDT polluted soil by ultrasonic wave, its ultrasonic wave can be produced by sonde-type equipment or slot type equipment.
The method of described remedying DDT polluted soil by ultrasonic wave, restorative procedure can be realized field repair.
Described DDT contaminated soil need carry out mechanical agitation to obtain uniform soil slurry before ultrasonic processing, the soil slurry is delivered to supersonic reaction device continuously via pump, and the ultrasonic reaction central area of flowing through successively.Supersonic reaction device is with condensing unit outward.
Beneficial effect of the present invention is:
1. adopt method of the present invention, organochlorine pesticide pollution thing such as DDT removes that speed is fast, mineralization rate is high in the soil.Because ultrasonic wave has ultrasonic cavitation and disturbance effect in the soil paste system, soil particle can promote cavitation bubble to form on its surface, organic mass-energy absorption DDT on soil particle surface, the high temperature and high pressure environment that the collapse of cavitation bubble produces can be realized the efficient removal of DDT in the soil.Can remove organochlorine pesticide pollution things such as DDT in the soil fast so utilize hyperacoustic cavitation and disturbance effect.
2. need not to add in soil and repair reagent, the secondary pollution risk is little, environmental protection, and investment is low with operating cost.The present invention directly uses ultrasonic cavitation and disturbance effect that the DDT in the soil is handled, thus need not environment to be polluted as other adding reagent in the chemical oxidation repairing method, more environmental protection, cost is lower.
3. ultrasonic reparation DDT contaminated soil is easy to execute-in-place.To the DDT contaminated soil, can use Fig. 2 and tubular ultrasonic reaction unit, directly DDT is polluted mud at the pollution scene and handle continuously, this technology is specially adapted to soil point-source pollution or heavily contaminated zone, and the ultrasonic removal to other contamination with chlorinated organics in the soil simultaneously has reference.
The present invention has chosen reasonable process conditions through field experiment, and treatment effect is obvious.Determine that through testing ultrasound wave irradiation time DDT in 1-30min removes the efficient height, the relation curve of reason time and DDT clearance as shown in Figure 1.Water content is preferred 40%wt～95%wt, and treatment effect is better; Water content is too low, handles slowlyer, and treatment effect is undesirable.
The ultrasonic frequency that is meant is higher than the sound wave of 20kHz, and ultrasonication can produce cavitation effect and mechanical disturbance effect when liquid.There is the decay of ultrasound intensity when the stopping effect of particle transmits ultrasonic wave in the liquid in slurry.Simultaneously, solid particle can impel cavitation bubble to form on its surface in solution, and cavitation bubble collapse moment produces local 5000K high temperature and 1000atm high pressure, and a large amount of little reaction environment of formation can be realized the quick mineralising of solid particles surface organic pollution.Soil particle mainly is made up of with organic mineral matter, the organic pollution in organic mass-energy enrichment soil on soil mineral surface, and ultrasound wave irradiation is expected to realize the efficient removal of organic pollution in the soil in the cavitation of particle surface.Therefore, the applicant is applied to the ultrasound wave irradiation technology reparation of organic polluted soil first, and the ultrasonic removal of DDT organic pollution in the actual pedotheque is studied, and also obtains desirable repairing effect.
Description of drawings:
Fig. 1 is the relation curve of processing time of the present invention and DDT clearance.
Fig. 2 is the supersonic reaction device schematic diagram.
The specific embodiment
Further specify the present invention by the following examples.
Embodiment 1:
For the examination soil organic matter content is 17.87g/kg soil; Fe in the soil
2O
3, MnO
2, TiO
2Content be respectively 55.15g/kg, 1.34g/kg, 15.21g/kg soil; Before repairing in the soil DDT concentration be 1mg/kg soil; Soil moisture is 60%; Each processing soil paste volume is 150mL, and the ultrasound wave irradiation frequency is 20kHz; Ultrasound wave irradiation power is 300W; The ultrasound wave irradiation time is 15min; Sonde-type equipment (as Fig. 2) is adopted in the ultrasonic wave emission.The DDT content of repairing in the soil of back is 285 μ g/kg soil, and the DDT clearance is 71.5%.
Embodiment 2:
Substantially the same manner as Example 1, but used soil organic matter content is a 11.24g/kg soil, Fe
2O
3, MnO
2, TiO
2Content be respectively 49.62g/kg, 0.95g/kg, 9.36g/kg soil.The ultrasonic clearance of DDT is 73.9%.
Embodiment 3:
Among the embodiment 1, other condition is constant, and when DDT concentration was 0.5mg/kg soil in the soil before repairing, the DDT clearance was 72.3%; When DDT concentration was 5mg/kg soil in the soil before repairing, the DDT clearance was 68.1%.
Embodiment 4:
Among the embodiment 1, other condition is constant, and soil moisture changes 35% into, and the DDT clearance is 32.8%; Soil moisture changes 80% into, and the DDT clearance is 75.2%.As seen, soil quality concentration is the key factor of the ultrasonic reparation of influence DDT contaminated soil.When soil moisture is low, because the stopping effect of high concentration soil particle makes ultrasound intensity reduce significantly.
Embodiment 5:
Among the embodiment 1, other condition is constant, and the ultrasound wave irradiation time, the clearance of DDT was 52.9% in the soil when being 5min; The ultrasound wave irradiation time, the clearance of DDT was 78.3% in the soil when being 30min; The ultrasound wave irradiation time, the clearance of DDT was 79.1% in the soil when being 45min.The ultrasound wave irradiation time is long more, and the DDT removal effect is good more, but the degradation rate growth tends towards stability behind the ultrasonic 30min, gets final product in 30 minutes so handle generally speaking.
Embodiment 6:
Among the embodiment 1, other condition is constant, and when ultrasonic power was 150W, the clearance of DDT was 31.1% in the soil; When ultrasonic power was 1000W, the clearance of DDT was 91.2% in the soil; When ultrasonic power was 2000W, the clearance of DDT was 98.5% in the soil.As can be seen, the removal effect of DDT in the ultrasound intensity appreciable impact soil.Ultrasonic power is high more, and the DDT removal effect is high more.
Embodiment 7:
Among the embodiment 1, other condition is constant, and when supersonic frequency was brought up to 47kHz, the clearance of DDT was 73.4% in the soil; When supersonic frequency was brought up to 100kHz, the clearance of DDT was 77.9% in the soil.The rising supersonic frequency helps the removal of DDT in the soil.
Embodiment 8:
A kind of method of remedying DDT polluted soil by ultrasonic wave is that the organic polluted soil slurry that humidity is 15%～95%, DDT concentration is 100～100000 μ g/kg is handled under the ultrasonic irradiation condition; Supersonic frequency is 20kHz～500kHz, and ultrasonic power is 50W～2.0kw; The ultrasound wave irradiation time is 1min～2h.
Wherein the humidity of soil can be arbitrary numerical value of 15%～95%, such as 15%, 22%, 34%, 65%, 95% etc.; DDT concentration also is the arbitrary numerical value between 100～100000 μ g/kg, such as 100 μ g/kg, 300 μ g/kg, 10000 μ g/kg, 50000 μ g/kg, 100000 μ g/kg; Supersonic frequency can be 20kHz, 41kHz, 100kHz, 500kHz; Ultrasonic power can be 50w, 100w, 650w, 1100w, 1650w, 2000w etc.; The ultrasound wave irradiation time is 1min, 5min, 38min, 64min, 120min etc.
Embodiment 9:
Among the embodiment 1, sonde-type equipment is adopted in the ultrasonic wave emission, and DDT is the highest at the clearance of ultrasound wave irradiation central area.DDT is relevant with probe diameter at the clearance of ultrasound wave irradiation central area in the soil, and diameter is big, and the DDT clearance reduces relatively.
Embodiment 10:
Among the embodiment 1, other condition is constant, and ultrasonic wave also can adopt slot type equipment to produce, but the DDT removal effect is relatively low.
Claims (4)
1. the method for a remedying DDT polluted soil by ultrasonic wave is characterized in that, is that 15%wt～95%wt, DDT concentration are that the organic polluted soil slurry of 100～100000 μ g/kg is handled under the ultrasonic irradiation condition with water content; Described organic polluted soil slurry adopts peristaltic pump evenly to be delivered to continuously in the ultrasonic reactor, and the organic polluted soil slurry upwards flows from the ultrasonic reactor bottom by the peristaltic pump effect, successively through flowing out from reactor top behind the ultrasonic removal central area; Supersonic frequency is 20kHz～500kHz, and ultrasonic power is 50W～2.0kw; The ultrasound wave irradiation time is 1min～2h.
2. the method for remedying DDT polluted soil by ultrasonic wave as claimed in claim 1 is characterized in that, described water content is 40%wt～95%wt; The described ultrasound wave irradiation time, DDT in 1-30min removed the efficient height.
3. the method for remedying DDT polluted soil by ultrasonic wave as claimed in claim 1 is characterized in that, described ultrasonic wave is produced by sonde-type equipment or slot type equipment.
4. the method for remedying DDT polluted soil by ultrasonic wave as claimed in claim 1 is characterized in that, described organic polluted soil slurry is by mixed with water by the DDT contaminated soil, and making uniform mud through mechanical agitation.
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| CN101941019A (en) * | 2010-08-19 | 2011-01-12 | 南京大学 | Method for removing chlordane and mirex in soil by utilizing ultrasonic wave/Fe |
| CN102225424A (en) * | 2011-04-08 | 2011-10-26 | 南京农业大学 | Apparatus for eluting and restoring contaminated soil of site with integration of stirring, ultrasounds and microwaves |
| CN104690085B (en) * | 2013-12-06 | 2017-04-12 | 华北电力大学 | Restoration apparatus of soil polluted by radionuclide Cs-137 |
| CN104550214B (en) * | 2014-12-09 | 2017-02-01 | 江苏盖亚环境工程有限公司 | Remediation method for DDT polluted soil |
| CN105251761A (en) * | 2015-11-10 | 2016-01-20 | 南京信息工程大学 | Ultrasonic degradation instrument and application thereof to aspect of soil organic pollutant degradation |
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| CN101195122A (en) * | 2007-12-18 | 2008-06-11 | 南京信息工程大学 | Method for renovating polycyclic aromatic hydrocarbon contaminated soil with ultrasound wave |
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| CN101195122A (en) * | 2007-12-18 | 2008-06-11 | 南京信息工程大学 | Method for renovating polycyclic aromatic hydrocarbon contaminated soil with ultrasound wave |
Non-Patent Citations (3)
| Title |
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| JP特开平2006-130395A 2006.05.25 |
| JP特开平2007-209916A 2007.08.23 |
| 王占杰.有机氯化物滴滴涕降解研究.《工程科技Ⅰ辑》.2008,(第11期),第31-33页. * |
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