CN104826863A - Method for removing benzo-a-pyrene in soil by utilizing ultrasonic waves and surfactant - Google Patents
Method for removing benzo-a-pyrene in soil by utilizing ultrasonic waves and surfactant Download PDFInfo
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- CN104826863A CN104826863A CN201510267392.2A CN201510267392A CN104826863A CN 104826863 A CN104826863 A CN 104826863A CN 201510267392 A CN201510267392 A CN 201510267392A CN 104826863 A CN104826863 A CN 104826863A
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Abstract
The invention discloses a method for removing benzo-a-pyrene in soil by utilizing ultrasonic waves and a surfactant. The method comprises the following steps: firstly, acquiring benzo-a-pyrene contaminated soil, removing impurities, carrying out air drying, grinding, and screening; secondly, pouring leacheate and the contaminated soil in the step 1 into a centrifugal pipe, stirring and mixing fully, so as to obtain uniform soil slurry; thirdly, putting the centrifugal pipe into an ultrasonic wave cleaner for ultrasonic treatment; fourthly, after ultrasonic treatment, putting the centrifugal pipe into the centrifugal machine for centrifuging and filtering so as to remove supernate; fifthly, carrying out ultrasonic treatment on soil by replacing an eluting agent by deionized water under the same condition so as to remove the leacheate component left in soil; and sixthly, separating mud from water by centrifuging and filtering so as to obtain clean soil, and backfilling the soil after natural air drying for contaminated places. The soil remediation method is simple and feasible, is low in device requirement, is low in energy consumption, and is convenient to operate.
Description
Technical field
The invention belongs to contaminated soil remediation technical field, relate to one and utilize ultrasonic wave and the collaborative method of repairing benzo [a] pyrene contaminated soil of surfactant.
Background technology
In recent years along with the use of fossil fuel and the aggravation of energy resource consumption, a large amount of polycyclic aromatic hydrocarbons is discharged in environment by all means.It is predicted, the annual emissions of the current polycyclic aromatic hydrocarbon of China is at more than 10000t, and air, soil, water body even all detect the existence of this pollutant in food.Wherein, benzo [a] the pyrene harm with 5 aromatic ring structures is maximum, and be proved to be and had very strong " three cause effect ", its carcinogenic toxicity accounts for more than 50% of the total carcinogenicity of polycyclic aromatic hydrocarbon.Benzo [a] pyrene pole is not soluble in water, and refractory organics is strong, can extended residual in soil.Therefore, efficiently, fast the repairing and treating technology of benzo [a] pyrene contaminated soil is very necessary in exploitation in time.The biodegradation research of benzo [a] pyrene is existing to be carried out, but hydrophobic benzo [a] pyrene is very easily firmly adsorbed by soil particle thing in soil, and bioavailability is poor, and microorganism is difficult to degraded, becomes one of principal element of restriction remediation efficiency.How to impel benzo [a] pyrene to get off from desorb soil, improve its solubility in liquid phase of soil, become the key factor improving benzo [a] pyrene contaminated soil remediation efficiency.
Ultrasonic extraction is as a kind of novel separation and leaching technology, and the method is simple to operate, and the processing time is short, and reaction condition is gentle, has been applied to the repairing research of contaminated soil.Ultrasonic wave has fluctuation and energy double attribute, and make material form a lot of hole, these little holes generate instantaneously, grow, collapse, and can produce high temperature, high pressure, strong shock wave and microjet, namely produce cavitation effect.Cavitation effect makes molecular diffusion aggravation on interface diffusion layer, accelerates the leaching rate of pollutant, improves recovery rate, thus reach the effect of desorption physically.Ultrasonic wave, also by discharging strong high frequency sound wave, making soil particle vibration, fine fisssure, thus increasing the contact area of soil and leacheate.Meanwhile, the selection of leacheate is considered to one of key factor affecting desorption of contaminants removal efficiency equally.In recent years, hydrophobic organic pollutant in the property of solubilizing desorb soil of surfactant is utilized to obtain paying close attention to widely both at home and abroad.Surfactant molecule has hydrophilic and double grading that is oleophylic, micella can be formed to increase the solubility of hydrophobic organic compound, and then promote that the organic matter of soil particle absorption discharges from soil to liquid phase, in this technology energy short time fast, the soil pollution of high-efficient purification high concentration, and disposal cost is comparatively cheap, be considered to one of most potential soil restoring technology.Hyperacoustic cavitation effect is combined with the solubilization of surfactant and carries out soil remediation, while utilizing the solubilising power raising ultrasonic wave of surfactant to the desorption effect of pollutant, ultrasonic wave also significantly can reduce the absorption of surfactant on soil, the valid density of surface of stability activating agent, is expected to reach the soil remediation efficiency better than single recovery technique.The current domestic rarely seen research utilizing two kinds of common renovation of organic pollution soil of technology, the technology therefore developing ultrasonic wave and surfactant Combined Treatment organic polluted soil has important theory significance and application prospect.
Summary of the invention
For the deficiency of existing soil restoring technology, the invention provides one and utilize benzo [a] pyrene method in ultrasonic wave and removal of surfactant contaminated soil.
To achieve these goals, the present invention adopts following technical scheme:
One utilizes the method for benzo [a] pyrene in ultrasonic wave and removal of surfactant soil, comprises the steps:
One, remove the impurity such as stone, rhizome after gathering benzo [a] pyrene contaminated soil, air-dry rear grinding also passes through 20 ~ 80 object soil sieves;
Two, the contaminated soil in leacheate and step one is poured in centrifuge tube according to volume (ml) weight (g) than the ratio of 10 ~ 15:1, and fully stir, mix, obtain uniform soil slurry;
Three, centrifuge tube is placed in ultrasonic cleaner, regulates ultrasonic output frequency between 20 ~ 80KHz, ultrasonic power output is between 200 ~ 800W, and control water temperature at 15 ~ 30 DEG C, the processing time is set to 30 ~ 60min;
Four, after ultrasonic process, centrifuge tube is put into centrifuge and carry out centrifugal, filtration removal supernatant, pollute for benzo [a] pyrene the soil that the time is long, concentration is higher, the soil after water and soil is separated can repeat step 2 ~ 31 ~ 2 time;
Five, by soil deionized water replace eluent with ultrasonic process 5 ~ 10min under step 2, three the same terms, to remove the leacheate compositions such as the surfactant remained in soil;
Six, by centrifugal, filter mud-water separation, obtain clean soil, after soil natural is air-dry, be used for the backfill of contaminated site.
In the present invention, described leacheate is by non-ionic surface active agent, anion surfactant, inorganic salts and solvent composition, specifically composed as follows: the mass ratio of non-ionic surface active agent Tween80 and anionic (SDS) is 3 ~ 4:1, the total concentration of Tween80 and SDS in eluent is 4.0 ~ 10.0g/L, and inorganic salts are K
2siO
3or K
2cO
3, concentration is 0.5 ~ 1.0g/L, and solvent is water.
Compared with prior art, tool of the present invention has the following advantages:
1, Tween80 and the SDS solubilising power adopted in the leached soil solutions used in the present invention is strong, elute effect good, and all merchandized handling, and use cost is low.The present invention adopts Tween80 and SDS to combine as leacheate main component, and wherein Tween80 can reduce the Krafft point of SDS, improves resistance to hard water, reduces the precipitation loss in soil; And SDS can reduce the adsorption loss of Tween80 on soil mineral, increase its valid density.
2, the present invention utilizes the solubilization co-treatment contaminated soil of hyperacoustic cavitation effect and surfactant, can produce collaborative effect of repairing.Such as, certain density surfactant significantly can promote the desorption effect of ultrasonic wave to pollutant by producing a large amount of micella, and ultrasonic process is to while desorption of contaminants, it also avoid the normal adsorption loss of surfactant in soil occurred in traditional ELUTION METHOD, ensure that the valid density of surfactant, thus improve the removal effect of benzo in soil [a] pyrene.
3, the K in this soil elution agent
2siO
3or K
2cO
3by reducing hydrophobic organic compound interfacial tension in the liquid phase with the interaction of surfactant, the dispersal ability of organic matter to aqueous phase can be improved; Also by the ionic atmosphere thickness of a large amount of ion compression surface active agent ion heads of hydrolysis generation, promote micelle forma-tion, improve the solubilising desorption ability of surfactant.
4, the desorption kinetic experiment of benzo [a] pyrene shows, the benzo of the method in process 30 ~ 60min [a] pyrene removal effect can reach balance.Often will process the 12h even longer time compared to surfactant wash-out restorative procedure, the method saves the soil treatment time greatly.
5, finally replace leacheate wash-out soil by deionized water in the present invention, object is to wash off and remains in surfactant in soil and inorganic salts etc., avoid leacheate composition enter into reparation after soil, pedo relict and secondary pollution can not be caused.
6, this soil remediation method is simple, not high to equipment requirement, and less energy consumption is easy to operate.
7, the present invention is not only applicable to the wash-out reparation of benzo [a] pyrene contaminated soil, and also have good wash-out removal effect to organic pollutions such as other polycyclic aromatic hydrocarbons in soil, range of application is wider simultaneously.
Detailed description of the invention
Below in conjunction with embodiment, technical scheme of the present invention is further described; but be not limited thereto; everyly technical solution of the present invention modified or equivalent to replace, and not departing from the spirit and scope of technical solution of the present invention, all should be encompassed in protection scope of the present invention.
Embodiment 1
Being dissolved in dichloromethane solvent by a certain amount of benzo [a] pyrene makes it fully dissolve, and it is evenly sprayed onto in sterile soil, natural air drying makes organic solvent volatilize, to be positioned in aseptic dark surrounds aging 1 month, obtained concentration is benzo [a] the pyrene simulating pollution soil of 30mg/kg.Benzo [a] the pyrene contaminated soil accurately taking 3.0g puts into the plastic centrifuge tube of 50ml, adds leached soil solutions (3.0g/LTween80,1.0g/LSDS, 1.0g/LK that 30ml has prepared
2siO
3, solvent is water) and be fully mixed into muddy (solid-to-liquid ratio 1:10), centrifuge tube is placed in groove type ultrasonic ripple washer after cover lid, supersonic frequency is 60KHz, and ultrasonic power output is 500W, processes 30min under 30 DEG C of conditions.Sample after process filters after centrifugal (3000r/min, 5min) process, by ultrasonic for soil deionized water process 10min, obtains the soil after repairing after filtration.Utilize the concentration of remaining benzo [a] pyrene in gas chromatograph for determination soil, show that the clearance of benzo [a] pyrene in this Soil Under Conditions is 62.31%.
Embodiment 2
The present embodiment benzo used [a] pyrene contaminated soil is with embodiment 1, the concentration of Tween80 in leacheate is risen to 8.0g/L, the concentration of SDS rises to 2.0g/L, and other treatment conditions are constant, and in soil, the clearance of benzo [a] pyrene is 72.68% after treatment.
Embodiment 3
The present embodiment benzo used [a] pyrene contaminated soil with embodiment 1, by K in leacheate
2siO
3replace with the K of same concentrations
2cO
3, other treatment conditions are constant, and in soil, the clearance of benzo [a] pyrene is 59.87% after treatment.
Embodiment 4
The present embodiment benzo used [a] pyrene contaminated soil, with embodiment 1, takes 2g soil and adds centrifuge tube, and make solid-to-liquid ratio be 1:15, other treatment conditions are constant, and in soil, the clearance of benzo [a] pyrene is 67.81% after treatment.
Embodiment 5
The present embodiment benzo used [a] pyrene contaminated soil is with embodiment 1, supersonic frequency is set to 20,40 and 80KHz respectively, other treatment conditions are constant, and in soil, the clearance of benzo [a] pyrene is respectively 58.61%, 63.84% and 64.13% after treatment.
Embodiment 6
The present embodiment benzo used [a] pyrene contaminated soil is with embodiment 1, ultrasonic power output is set to 200,400,600 and 800W respectively, other treatment conditions are constant, and in soil, the clearance of benzo [a] pyrene is respectively 29.15%, 46.58%, 71.98% and 76.69% after treatment.
Embodiment 7
The present embodiment benzo used [a] pyrene contaminated soil is with embodiment 1, and sonication treatment time is 40,50 and 60min, and other treatment conditions are constant, and in soil, the clearance of benzo [a] pyrene is respectively 66.37%, 69.32% and 71.35% after treatment.
Embodiment 8
Benzo used [a] pyrene contaminated soil and processing method are with embodiment 1, and more renew leacheate repeatedly after ultrasonic process 2 times and 3 times, in soil, the clearance of benzo [a] pyrene is respectively 76.87% and 85.81%.
Claims (4)
1. utilize a method for benzo [a] pyrene in ultrasonic wave and removal of surfactant soil, it is characterized in that described method step is as follows:
One, remove impurity after gathering benzo [a] pyrene contaminated soil, air-dry rear grinding is also sieved;
Two, the ratio of the contaminated soil in leacheate and step one according to envelope-bulk to weight ratio 10 ~ 15:1 is poured in centrifuge tube, and fully stir, mix, obtain uniform soil slurry;
Three, centrifuge tube is placed in ultrasonic cleaner, regulates ultrasonic output frequency between 20 ~ 80KHz, ultrasonic power output is between 200 ~ 800W, and control water temperature at 15 ~ 30 DEG C, the processing time is set to 30 ~ 60min;
Four, after ultrasonic process, centrifuge tube is put into centrifuge and carry out centrifugal, filtration removal supernatant;
Five, by soil deionized water replace eluent with ultrasonic process 5 ~ 10min under step 2, three the same terms, to remove the leacheate composition remained in soil;
Six, by centrifugal, filter mud-water separation, obtain clean soil, after soil natural is air-dry, be used for the backfill of contaminated site.
2. the method utilizing benzo [a] pyrene in ultrasonic wave and removal of surfactant soil according to claim 1, is characterized in that described benzo [a] pyrene contaminated soil crosses 20 ~ 80 object soil sieves.
3. the method utilizing benzo [a] pyrene in ultrasonic wave and removal of surfactant soil according to claim 1, it is characterized in that described leacheate is by non-ionic surface active agent, anion surfactant, inorganic salts and solvent composition, specifically composed as follows: the mass ratio of non-ionic surface active agent Tween80 and anion surfactant SDS is 3 ~ 4:1, the total concentration of Tween80 and SDS in eluent is 4.0 ~ 10.0g/L, and inorganic salts are K
2siO
3or K
2cO
3, concentration is 0.5 ~ 1.0g/L, and solvent is water.
4. the method utilizing benzo [a] pyrene in ultrasonic wave and removal of surfactant soil according to claim 1, it is characterized in that in described step 4, pollute for benzo [a] pyrene the soil that the time is long, concentration is higher, the soil after water and soil is separated can repeat step 2 ~ 31 ~ 2 time.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN201510267392.2A CN104826863A (en) | 2015-05-22 | 2015-05-22 | Method for removing benzo-a-pyrene in soil by utilizing ultrasonic waves and surfactant |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107639108A (en) * | 2017-07-21 | 2018-01-30 | 郑旭东 | A kind of Ex-situ washing remediation of heavy-metal contaminated soil |
| CN107855353A (en) * | 2017-07-21 | 2018-03-30 | 郑旭东 | A kind of plane leaching repairing method in situ of heavy-metal contaminated soil |
| CN108273839A (en) * | 2018-03-12 | 2018-07-13 | 毅康科技有限公司 | A kind of Petroleum concentration soil treatment system |
| CN108480394A (en) * | 2018-03-29 | 2018-09-04 | 北京高能时代环境技术股份有限公司 | A kind of efficient chemical for organic polluted soil aoxidizes restorative procedure |
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| CN1830587A (en) * | 2005-09-16 | 2006-09-13 | 上海文绿生物科技有限公司 | Modifier used for soil pollution treatment and soil natural activity restoring and its formulation |
| CN102218445A (en) * | 2011-05-13 | 2011-10-19 | 沈阳大学 | Ultrasonic leaching method for restoring organic contaminated soils |
| CN103495596A (en) * | 2013-09-24 | 2014-01-08 | 廖柏寒 | Elution method for heavy metals in soil |
| CN104531155A (en) * | 2014-12-03 | 2015-04-22 | 东北林业大学 | Eluent for benzo[a]pyrene in soil and elution method thereof |
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Patent Citations (5)
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| RU2236916C1 (en) * | 2003-06-30 | 2004-09-27 | Индивидуальный Предприниматель Без Образования Юридического Лица Ващенко Юрий Ефимович | Method of determining weight concentration of benzo-a-pyrene in soil |
| CN1830587A (en) * | 2005-09-16 | 2006-09-13 | 上海文绿生物科技有限公司 | Modifier used for soil pollution treatment and soil natural activity restoring and its formulation |
| CN102218445A (en) * | 2011-05-13 | 2011-10-19 | 沈阳大学 | Ultrasonic leaching method for restoring organic contaminated soils |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107639108A (en) * | 2017-07-21 | 2018-01-30 | 郑旭东 | A kind of Ex-situ washing remediation of heavy-metal contaminated soil |
| CN107855353A (en) * | 2017-07-21 | 2018-03-30 | 郑旭东 | A kind of plane leaching repairing method in situ of heavy-metal contaminated soil |
| CN108273839A (en) * | 2018-03-12 | 2018-07-13 | 毅康科技有限公司 | A kind of Petroleum concentration soil treatment system |
| CN108480394A (en) * | 2018-03-29 | 2018-09-04 | 北京高能时代环境技术股份有限公司 | A kind of efficient chemical for organic polluted soil aoxidizes restorative procedure |
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Application publication date: 20150812 |