CN111250527A - Method for removing persistent organic pollutants in soil through Triton X-100 enhanced advanced oxidation in cooperation with electrokinetic remediation - Google Patents
Method for removing persistent organic pollutants in soil through Triton X-100 enhanced advanced oxidation in cooperation with electrokinetic remediation Download PDFInfo
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Abstract
The invention belongs to the technical field of soil pollution remediation, and relates to a method for removing persistent organic pollutants in soil by using Triton X-100 enhanced advanced oxidation in cooperation with electrokinetic remediation, which comprises the following steps: 1) transferring the polluted soil to an electric restoration device, and adding an oxidant and triton X-100 into the soil; 2) adjusting the pH value of the electrolyte, and starting the electric repairing device to remove the persistent organic pollutants in the soil. The oxidant is at least one of persulfate, hydrogen peroxide, permanganate and hypochlorite. The method provided by the invention is based on the combined treatment mode of electric remediation, oxidant and triton X-100 to remove the persistent organic pollutants in the soil cooperatively, so that the removal rate of the persistent organic pollutants in the soil can be greatly improved, and meanwhile, the in-situ removal can be realized.
Description
Technical Field
The invention relates to the technical field of electrokinetic remediation analysis, in particular to a method for removing persistent organic pollutants in soil by using Triton X-100 enhanced advanced oxidation in cooperation with electrokinetic remediation.
Background
With the acceleration of urbanization process in China, along with the development of industries, organic poisons discharged to the environment from medicines, petrochemical industry, grease, solvents, pesticides and other industries are increasing day by day. The application of pesticides and the entry of organic waste containing various synthetic chemicals into the soil through various routes have affected the soil environment to varying degrees. These organic compounds can undergo migration and transformation processes in the soil, and their residues and their transformation products can negatively affect the environmental quality and the safety of agricultural products. It has been found that biocides against specific target organisms can also harm non-target organisms, for example DDT can be very effective in reducing the incidence of malarial and other diseases, once called one of the "most important living necessities"; however, when DDT is used, the DDT is found to affect the growth of fishes such as lake trout, has wide spread in environmental media, and has similar tendency between accumulation in soil and river sediments and regional sales volume. It is noteworthy that some polychlorinated biphenyls (PCBs), which are not useful as biocides, also pose a health risk to certain organisms and may cause toxic effects when ingested at certain concentrations in the organism. Most pesticides are persistent organic pollutants, which are a serious global problem due to their persistence, long-range mobility, bioaccumulation in adipose tissue, and high toxicity. At present, the in-situ remediation of the soil in the pesticide-polluted site is very challenging, and the remediation of the pesticide-polluted site is not slow enough.
The in-situ advanced oxidation technology is widely applied to in-situ remediation of organic polluted soil and underground water, and has the advantages of simple and convenient operation, higher remediation efficiency, deep treatment depth and the like. The in-situ advanced oxidation technology injects an oxidant (persulfate, potassium permanganate, hydrogen peroxide and the like) into soil and diffuses the oxidant into an area where target pollutants exist. The technology can efficiently remove the dirtThe reason for the dyeing is that the in-situ oxidation reaction generates strongly oxidizing intermediates (such as hydroxyl radical (HO. cndot.) and sulfate radical (SO)4-. cndot.) oxidizes organic and inorganic pollutants to harmless or less harmful chemicals. However, for low-permeability soil, the oxidizing agent is difficult to permeate and migrate in the soil, so that the removal efficiency of persistent organic pollutants is low.
In order to enhance the healing effect, a combination of two or more healing techniques is often required. The electro-kinetic (EK) remediation technology utilizes various electro-kinetic effects (such as electromigration, electroosmotic flow and electrophoresis) generated by an electric field to drive pollutants in soil to directionally migrate along the direction of the electric field, so that the pollutants are concentrated to an electrode area and then concentrated or separated; in recent years, the electrokinetic remediation technology and the chemical oxidation technology are applied to remediation of organic contaminated soil, but the problem of low pollutant removal rate exists, and the technology needs to be further researched and practiced in the application of persistent organic pollutant contaminated site soil.
Therefore, providing an electrokinetic-chemical combined remediation method capable of effectively promoting soil polluted by persistent organic pollutants has become an urgent technical problem to be solved in the field.
Disclosure of Invention
1. Technical problem to be solved by the invention
Aiming at the defect of low removal efficiency of persistent organic pollutants in soil in the prior art, the invention provides a method for removing the persistent organic pollutants by combining an electric remediation technology and an advanced oxidation technology and simultaneously introducing triton X-100 for synergistic enhancement.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention provides a method for removing persistent organic pollutants in soil by using Triton X-100 to strengthen advanced oxidation in coordination with electrokinetic remediation, which induces an electrochemical reaction process (such as electrode surface redox, heat transfer and electrokinetic transportation processes (electromigration, electrophoresis and electroosmotic flow)) by applying low direct current to an electrode placed in the soil, and comprises the following specific steps:
1) transferring the soil to an electric restoration device, and adding an oxidant and a surfactant Triton X-100 into the soil;
2) adjusting the pH value of the electrolyte, and starting the electric repairing device to remove the persistent organic pollutants in the soil.
As a further improvement of the present invention, the oxidizing agent is at least one of a persulfate, hydrogen peroxide, permanganate, and hypochlorite.
As a further improvement of the invention, the pH value of the electrolyte is adjusted to 4-5 in the step 2).
As a further improvement of the invention, the soil contains transition metal ions, including any one or combination of As, Cd, Co, Cr, Cu, Mn, Ni, Pb, Zn and Fe.
Fe2+The transition metal ions are soluble and dominant under acidic conditions, and the metals such as iron are relatively insoluble or have low solubility in most water systems under the condition that the pH is more than or equal to 5.
As a further improvement of the invention, the soil contains iron oxide of any one or combination of siderite, hematite or magnetite.
As a further improvement of the invention, the soil contains Fe with mass concentration more than 4.12%2O3。
As a further improvement of the invention, the concentration of the triton X-100 by volume is 10%.
As a further improvement of the invention, the oxidizing agent is a persulfate.
As a further improvement of the present invention, the persulfate has a mass concentration of 20%.
As a further improvement of the invention, the persistent organic contaminant comprises any one of 1,3, 5-trichlorobenzene (1,3,5-TCB), 1,2, 4-trichlorobenzene (1,2,4-TCB), 1,2, 3-trichlorobenzene (1,2,3-TCB), 1,2,4, 5-tetrachlorobenzene (1,2,4,5-TCB), pentachlorobenzene (PeCB), Hexachlorobenzene (HCB), 4-dichloroethylene (4,4, -DDE), 2, 4' -dichloroethylene (2,4, -DDT) or 4,4, -dichloroethylene (4,4, -DDT).
As a further improvement of the present invention, the electrode material of the electric prosthetic device is any one of graphite, iron, titanium, stainless steel or alloy.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) the method for removing the persistent organic pollutants in the soil through the enhanced advanced oxidation and the electric restoration of the triton X-100 is characterized in that a combined treatment mode of the triton X-100+ the electric restoration and the oxidant is utilized, the triton X-100 can obviously improve the dissolution rate of the persistent organic pollutants which are insoluble compounds and are tightly combined with soil particles compared with other surfactants, and an electric restoration device is used for promoting the migration of the oxidant and the surfactant in the soil as a cosolvent to promote the transmission and the diffusion of the cosolvent in the soil, so that the effective contact of the insoluble compounds and the oxidant in the soil can be obviously promoted, and the reaction efficiency is promoted.
(2) Compared with other surfactants, the method for removing the persistent organic pollutants in the soil by using the triton X-100 enhanced advanced oxidation in cooperation with electrokinetic remediation, disclosed by the invention, has the advantages that the triton X-100 has better solubility on iron existing in the soil, and the Fe in the soil can be accelerated on the premise of not adding exogenous iron2+、Fe3+Cyclic reaction of (2), continuous supply of Fe to the system2 +More Fe2+Further, S can be promoted2O8 2-Activation to produce sulfate radical (SO)4-) and hydroxyl radicals (HO-, E0 ═ 2.8V), thereby more effectively oxidatively degrading persistent organic pollutants. Therefore, the triton X-100 can synergistically enhance the effect on removing persistent organic pollutants by advanced oxidation.
Drawings
FIG. 1 is a diagram showing the physicochemical properties of soil in example 1 of the present invention;
fig. 2 is a design view of an electromotive repairing apparatus in embodiment 1 of the present invention;
FIG. 3 is a graph of the removal rate of persistent organic pollutants from soil over time in various set-up groups of example 1: : a, 10% triton X-100; b, 10% triton X-100 and nano zero-valent iron (nZVI);
FIG. 4 is a graph of the removal rate of persistent organic pollutants from soil over time in different set-up groups of example 2: a, 20% Na2S2O8(ii) a b, 10% Triton X-100 and 20% Na2S2O8(ii) a c, 10% Triton X-100, 20% Na2S2O8And nano zero valent iron (nZVI);
FIG. 5 shows the elution efficiency of persistent organic pollutants from the soil in each set of the example 3 under the conditions of different concentrations of Triton X-100(a), different liquid-solid ratios (b) and different reaction times (c);
in the figure: 1. a detachable cover plate; 2. a liquid storage chamber; 3. an electrode chamber; 4. a flow stabilizing pore passage clapboard.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
Instruments and reagents
The invention relates to a method for removing persistent organic pollutants in soil in situ, which adopts an accelerated solvent extraction instrument (U.S. Thermo Scientific) and a YK-AD5050 power supply of Guangzhou postal and telecommunications equipment, Inc., and has a constant voltage of 2V cm-1And a GC-muecd (Agilent 7890A/5975C, 7693 autosampler, usa) detector, ethyl acetate (chromatographically pure), acetonitrile (chromatographically pure), n-hexane (chromatographically pure) purchased from j.t.baker, inc (usa). The GC-mu ECD detector with the automatic sample injector is used for qualitatively and quantitatively analyzing the persistent organic pollutants, the price of the GC-mu ECD detector used in the invention is relatively low, and the GC-mu ECD detector can be popularized and used in common laboratories, so that the detection cost of the GC-mu ECD detector is reduced.
Example 1
The method for strengthening electrokinetic elution of persistent organic pollutants in soil by triton X-100 in the embodiment specifically comprises the following steps:
step 1) the soil sample polluted by persistent organic pollutants is collected from the sewage treatment system of a certain pesticide factory in ChinaIn the downstream polluted site, a soil sample is collected from surface soil, ground by a 2mm sieve and stored in an environment at 4 ℃ for standby, and part of soil is taken to measure the physical and chemical properties of the soil and the mineral composition, wherein the physical and chemical properties of the soil are shown in figure 1. The soil contains 4.12% of Fe by mass concentration2O3. The soil acid digestion is adopted to analyze inorganic elements (As, Cd, Co, Cr, Cu, Mn, Ni, Pb, Zn) in the soil, and Agilent 7700x and PE Optima8000 are used to quantitatively determine trace elements and other elements. The original conductivity of the soil was measured by adding 10g of dry soil sample to 50mL of distilled water, shaking for 30min and measuring the supernatant using a conductivity meter (DDB 303A). A10 g dry soil sample was weighed and dissolved in 25mL 1M KCl solution, and the pH was measured with a pH meter (pH/ISE meter 410P-01).
And 2) assembling the electric repair device, and setting each group of experiments, wherein the electric repair experiments are carried out in a reactor consisting of five compartments, and the reactor adopts a YK-AD5050 power supply of Guangzhou postal and telecommunications equipment, Inc. and has a constant voltage of 2V/cm. The reactor is shown in figure 2.
The soil treatment capacity of the central compartment was 2dm3(height 10cm, length 20cm, width 10 cm). The capacity of the electrode cell was 0.6dm3(6cmx10cmx10cm), each electrode cell is connected with a capacity of 0.6dm3(6cmx10cmx10cm) reservoir, the purpose of which is to collect the possible excess electrolyte, avoiding it overflowing at the laboratory bench. As shown in fig. 2, the detachable cover plate 1 is used for conveniently taking and placing soil and adding reagents, the liquid storage chamber 2 is used for storing electrolyte liquid, the electrode chamber 3 is internally provided with a graphite plate electrode, and the parameters of the graphite plate electrode are as follows: the length is 110mm, the width is 60mm, and the thickness is 10 mm. The soil chamber is divided into three sections: s1, S2, and S3 (from anode to cathode) to monitor the uniformity of treatment. A flow-stabilizing pore passage partition plate 4 is used as a membrane filter for separating the soil chamber from the electrode battery.
Step 3) experiment sets 2 groups respectively, wherein the group 1 is an embodiment group without nano zero-valent iron, and the group 1 is set as follows: triton X-100 was added to the soil at a volume concentration of 10%, said Triton X-100 being available from national pharmaceutical group chemical Co., Ltd. (CAS No. 9002-93-1).
Step 4) adjusting the pH value of the electrolyte to about 4-5 (Fe)2+When the transition metal ions are soluble and dominant under the acidic condition, when the pH is more than or equal to 5, the metals such as iron and the like are relatively insoluble or have low solubility in most water systems), the change of the transition metal ions is recorded before the solvent is replaced every day, and an electric repairing device (EK) is started to remove persistent organic pollutants in soil.
And 5) collecting soil samples between 0, 5, 10 and 15 days, performing ASE extraction, SPE purification, concentration and volume fixing, and then measuring GC-mu ECD. The specific operation is as follows: 0.5g of soil and 3g of diatomaceous earth were weighed out and stirred well, and extracted with a hexane/acetone (5:1, v/v) mixed solution at 100 ℃ and 1500 psi. The extract was rotary concentrated to 1mL at 50 ℃ by rotary evaporator, and the concentrate was extracted with SPE (sulfuric acid acidified silica gel/anhydrous sodium sulfate) and eluted with 15mL of n-hexane. The eluate was then concentrated to 1mL and the persistent organic contaminants were detected by GC- μ ECD.
The results for group 1 are as follows: after the triton X-100 with the volume concentration of 10% is adopted as a surfactant and an electrokinetic technology is combined to restore the soil polluted by the persistent organic pollutants for 5 days, the removal rate of the persistent organic pollutants in the soil is 18% (1,2,4-TCB) at the lowest and 60% (PeCB) at the highest; after 10 days, the removal rate of persistent organic pollutants in the soil is 34 percent at the lowest (DDT) and 66 percent at the Highest (HCB); after 15 days, the removal rate of persistent organic pollutants in the soil was 50% (DDT) at the lowest and 76% (HCB) at the highest (fig. 3). Test results show that the triton X-100 can promote the combination state of the hydrophobic persistent organic pollutants and soil particles to be changed, and the combination state is dissolved in a water phase and transferred from the soil, so that the persistent organic pollutants in the soil can be effectively removed.
The results of group 2 (comparative example) show that the overall removal effect of persistent organic pollutants in soil is not obviously improved by adding exogenous iron (nZVI), because the invention adopts triton X-100 and the oxidant as the co-solvent, on one hand, the co-solvent has better solubility to iron in soil (the self metal ions and metal oxides in soil can meet the repair requirement under the condition of the embodiment), and on the premise of not adding exogenous iron (nZVI), the Fe in soil can be accelerated2+、Fe3+Cyclic reaction of (2), continuous supply of Fe to the system2+More Fe2+Further, S can be promoted2O8 2-The activation generates sulfate free radicals and hydroxyl free radicals, and the triton X-100 and the oxidant are used as co-solvents, so that the combination state of the hydrophobic persistent organic pollutants and soil particles can be changed, the migration capacity of the hydrophobic persistent organic pollutants in the soil can be increased, and the persistent organic pollutants in the soil can be effectively degraded aiming at the low-permeability soil. Therefore, Triton X-100 and the oxidizing agent can synergistically enhance the effect on the advanced oxidative removal of persistent organic pollutants.
Example 2
The method for removing persistent organic pollutants in soil by using triton X-100 enhanced advanced oxidation in cooperation with electrokinetic remediation is basically the same as that in example 1, except that:
step 3) experiment sets up 5 groups respectively, and group 1, group 2 and group 3 are the contrast group that does not set up nanometer zero-valent iron, and the setting of group 1 is: triton X-100 was added to the soil at a concentration of 10% by volume, with the settings for group 2 being: adding the mixture into soil at a mass concentration of20% of Na2S2O8The setting of group 3 is: adding 10 volume percent of triton X-100 and 20 mass percent of Na into soil2S2O8. Groups 4-5 are experimental groups setting nano zero-valent iron, wherein the setting of group 4 is as follows: triton X-100 with the volume concentration of 10 percent and Na with the mass concentration of 20 percent are added into the soil at the same time2S2O8. The settings for group 5 are: triton X-100 with the volume concentration of 10 percent is added into the soil.
The groups are labeled: group 1: triton X-100, group 2: na (Na)2S2O8Group 3: triton X-100-Na2S2O8Group 4: triton X-100-Na2S2O8-nZVI, group 5: triton X-100-nZVI, electrochemical experimental setup as shown in Table 1.
TABLE 1 electrochemical Experimental setup
Table 2 shows the average removal rate results for each persistent organic contaminant measured in the first stage (5 days) of each set of settings.
TABLE 2 average removal rate statistics for each persistent organic contaminant (S1-5 days)
Table 3 shows the average removal rate results for each persistent organic contaminant measured in the second stage (10 days) for each set of settings.
TABLE 3 average removal Rate statistics for each persistent organic contaminant (S2-10 days)
Table 4 shows the average removal rate of each persistent organic contaminant measured at the third stage (15 days) for each set of settings.
TABLE 4 average removal Rate statistics for each persistent organic contaminant (S3-15 days)
Group 2: na with the mass concentration of 20 percent is selected2S2O8As an oxidant, the influence of the electrokinetic synergistic chemical oxidation on the remediation effect of the soil polluted by the persistent organic pollutants is evaluated. After 5 days, the removal rate of persistent organic pollutants in the soil is at least 22% (2, 4' -DDT) and at most 38% (1,2,4, 5-TCB); after 10 days, the removal rate of persistent organic pollutants in the soil is 33 percent at least (2, 4' -DDT) and 46 percent at most (1,2,4, 5-TCB); after 15 days, the removal rate of persistent organic pollutants in the soil was at least 41% (4, 4' -DDE) and at most 56% (1,2,4,5-TCB) (fig. 4). The result shows that the strong hydrophobicity of the persistent organic pollutants causes the persistent organic pollutants to be adsorbed to soil particles and difficult to desorb and dissolve in the water phase, so that the effect of degrading the persistent organic pollutants in the soil through chemical oxidation is weakened; the polluted soil is repaired by electric synergistic chemical oxidation, and the infiltration and migration capacity of the oxidant in the soil can be enhanced, so that the persistent organic pollutants are oxidized and degraded.
Group 3: selecting triton X-100 and Na2S2O8As a co-solvent to evaluate Triton X-100 and Na based on electrokinetic remediation2S2O8The combined use has the effect on the removal effect of persistent organic pollutants in polluted soil. After 5 days, the removal rate of persistent organic pollutants in the soil is 23 percent at the lowest (4, 4' -DDE) and 65 percent at the highest (1,2,4, 5-TCB); after 10 days, the removal rate of persistent organic pollutants in the soil is 41 percent at the lowest (2, 4' -DDT) and 72 percent at the highest (1,2,4, 5-TCB); after 15 days, the removal rate of persistent organic pollutants in the soil was 56% at the lowest (4, 4' -DDE) and 88% at the highest (1,2,4-TCB) (fig. 4). The result shows that the enhanced electrokinetic combined chemical oxidation of the triton X-100 obviously improves the removal efficiency of the persistent organic pollutants in the soil, and the removal rate of the persistent organic pollutants in the soil is improved by 20-30%, because the surfactant triton X-100 can dissolve the persistent organic pollutants tightly combined with soil particlesOrganic contaminants, moving by electromigration or electroosmotic flow, while Na2S2O8Producing SO with strong oxidation under the action of electrokinetic effect4 -·Thereby oxidizing and degrading persistent organic pollutants in the soil.
Group 4: further addition of nZVI on group 3 basis to evaluate Triton X-100, Na on electrokinetic repair2S2O8The effect of the combination with nZVI on the removal of persistent organic pollutants from soil. After 5 days, the removal rate of persistent organic pollutants in the soil is 47 percent at least (1,2,4-TCB) and 65 percent at most (HCB); after 10 days, the removal rate of persistent organic pollutants in the soil is 52 percent at the lowest (4, 4' -DDT) and 74 percent at the Highest (HCB); after 15 days, the removal rate of persistent organic pollutants in the soil was 61% at the lowest (DDT) and 88% at the highest (1,2,4-TCB) (FIG. 4).
The results show that the overall removal efficiency of persistent organic pollutants in soil is not obviously improved compared with that of the soil without adding nZVI (group 3), and the addition of nano zero-valent iron in an advanced oxidation system can supplement available Fe in the system according to theory2+Can accelerate Fe in soil2+、Fe3+Cyclic reaction of (2), continuous supply of Fe to the system2+To promote S2O8 2-The activation generates sulfate free radicals and hydroxyl free radicals, and the study of the invention proves that the triton X-100 has better solubility on the iron oxide existing in the soil and is beneficial to promoting the dissolution of the iron oxide, so that the strengthening requirement of advanced oxidation can be met, and the nZVI does not play a leading role in strengthening the repairing effect in the process.
Example 3
In this example, the elution effect of triton X-100 on persistent organic pollutants in soil under different setting conditions was analyzed, and the used device and operation steps were substantially the same as those in example 1.
Step 1), taking 20g of standby polluted soil into a volumetric flask, respectively adding 0%, 5%, 10% and 20% triton X-100 solution by volume ratio, adjusting the pH value to about 5 (maintaining the dissolution of metal ions in the soil and keeping the in-situ activation of an oxidant) by using sulfuric acid and/or sodium hydroxide, horizontally shaking for 48h, and eluting persistent organic pollutants in the soil.
Step 2), weighing 2g of eluted soil, adding a proper amount of diatomite, uniformly mixing, pouring into a 15mL ASE extraction pool, extracting by using hexane/acetone (5:1, v/v), wherein the ASE extraction conditions are as follows: extracting at 100 deg.C under 1500psi for 5min, statically extracting for 5min, circulating once, and purging with nitrogen for 40s to collect all extractive solutions. The extract was transferred to a 50mL pear-shaped flask and rotary concentrated at 50 ℃ to approximately 1 mL.
And 3) transferring the concentrated solution to an SPE extraction column, filling a polytetrafluoroethylene gasket at an outlet of the extraction column, sequentially filling 1g of sulfuric acid acidified silica gel and 1g of anhydrous sodium sulfate, and filling a polytetrafluoroethylene gasket at an inlet of the extraction column. Before elution, the extraction column was activated with 5mL of n-hexane. 10mL of n-hexane/dichloromethane (9:1, v/v) is selected for elution, the eluent is blown to be nearly dry by nitrogen, and is dissolved in 1mL of n-hexane again for GC/mu ECD determination.
Step 4), in addition, the liquid-solid ratio (L/S2.5, 5, 10) and the reaction time of different triton X-100/soil were set at the optimal concentration of triton X-100, and step 2) and step 3) were repeated.
The embodiment shows that after 0%, 5%, 10% and 20% triton X-100 by volume concentration is added, the removal rates of persistent organic pollutants in soil after 48 hours are respectively 36-53%, 55-69% and 40-66%. Finally 10% of triton X-100 is selected. On the other hand, as the L/S ratio was increased from 2.5 to 10, the elution efficiency also increased, indicating that the larger the L/S, the easier the surfactant comes into contact with the soil surfactant, the higher the elution efficiency of persistent organic pollutants, and the higher the remediation cost. The longer the reaction time is, the higher the elution efficiency is, when the L/S is 10, after 48 hours, the elution efficiency of the persistent organic pollutants is 55-69%. FIG. 5 is a comparison of elution efficiency of persistent organic pollutants in Triton X-100 soil under different set conditions; the result shows that the dissolving efficiency of the persistent organic pollutants is improved by 46-63% within 12-24 h; the improvement is 68-150% within 12-48 hours. The results show that a concentration of 10%, L/S10 and 48h elution time are reliable conditions for obtaining the best elution efficiency.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for removing persistent organic pollutants in soil by using Triton X-100 enhanced advanced oxidation in cooperation with electrokinetic remediation is characterized by comprising the following steps: the method comprises the following specific steps:
1) transferring the soil to an electric restoration device, and adding an oxidant and a surfactant Triton X-100 into the soil;
2) adjusting the pH value of the electrolyte, and starting the electric repairing device to remove the persistent organic pollutants in the soil.
2. The method for removing persistent organic pollutants in soil by using triton X-100 to enhance advanced oxidation in cooperation with electrokinetic remediation as claimed in claim 1, wherein the method comprises the following steps: the oxidant is at least one of persulfate, hydrogen peroxide, permanganate and hypochlorite.
3. The method for removing persistent organic pollutants in soil by utilizing triton X-100 to enhance advanced oxidation in cooperation with electrokinetic remediation according to claim 1 or 2, wherein the method comprises the following steps: and adjusting the pH value of the electrolyte to 4-5 in the step 2).
4. The method for removing persistent organic pollutants in soil by using triton X-100 to enhance advanced oxidation in cooperation with electrokinetic remediation as claimed in claim 3, wherein: the soil contains transition metal ions, and the transition metal ions comprise any one or combination of As, Cd, Co, Cr, Cu, Mn, Ni, Pb, Zn or Fe.
5. The method for removing persistent organic pollutants in soil by using triton X-100 to enhance advanced oxidation in cooperation with electrokinetic remediation as claimed in claim 4, wherein: the soil contains iron oxide of any one or combination of siderite, hematite or magnetite.
6. The method for removing persistent organic pollutants in soil by utilizing triton X-100 to enhance advanced oxidation in cooperation with electrokinetic remediation according to claim 1 or 2, wherein the method comprises the following steps: the volume concentration of the triton X-100 is 10%.
7. The method for removing persistent organic pollutants in soil by using triton X-100 to enhance advanced oxidation in cooperation with electrokinetic remediation as claimed in claim 6, wherein the method comprises the following steps: the oxidant is persulfate.
8. The method for removing persistent organic pollutants in soil by using triton X-100 to enhance advanced oxidation in cooperation with electrokinetic remediation as claimed in claim 7, wherein: the mass concentration of the persulfate is 20%.
9. The method for removing persistent organic pollutants in soil by using triton X-100 to enhance advanced oxidation in cooperation with electrokinetic remediation as claimed in claim 7, wherein: the persistent organic contaminants include 1,3, 5-trichlorobenzene, 1,2, 4-trichlorobenzene, 1,2, 3-trichlorobenzene, 1,2,4, 5-tetrachlorobenzene, pentachlorobenzene, hexachlorobenzene, 4-dichloroethylene, 2, 4-dichloroethylene’-dichlorodiphenyl trichloroethane or 4, 4' -dichlorodiphenyl trichloroethane.
10. The method for removing persistent organic pollutants in soil by utilizing triton X-100 to enhance advanced oxidation in cooperation with electrokinetic remediation according to claim 8 or 9, wherein the method comprises the following steps: the electrode material of the electric repairing device is any one of graphite, iron, titanium, stainless steel or alloy.
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| CN115672968A (en) * | 2022-11-11 | 2023-02-03 | 常州大学 | Method for ultrasonically-enhanced electrically-remediating phenanthrene-contaminated soil |
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