Highly efficient solubilizing surfactants for chlorinated hydrocarbons, applications and methods of preparation

Abstract

This invention relates to the field of environmental engineering technology, specifically to a highly efficient solubilizing surfactant for chlorinated hydrocarbons, its application, and a method for its preparation. The surfactant comprises decaethylene glycol monododecyl ether, Tween 20, and water. This surfactant is used to solubilize chlorinated hydrocarbon organic pollutants in contaminated sites, including soil, groundwater, and surface water. The mixture of decaethylene glycol monododecyl ether and Tween 20 produces mixed micelles, which increases the solubility of chlorinated hydrocarbons in water and significantly reduces the CMC value of the mixed surfactant, effectively reducing the amount of surfactant required and lowering remediation costs. This surfactant exhibits good biodegradability, high solubilizing ability, and low cost, achieving environmental pollution remediation while reducing secondary pollution.

Description

Technical Field

[0001] This invention relates to the field of environmental engineering technology, and more specifically, to highly efficient solubilizing surfactants for chlorinated hydrocarbons, their applications, and preparation methods. Background Technology

[0002] With rapid economic and social development, soil pollution has become increasingly prominent. Chlorinated hydrocarbons (CHs) have become common pollutants in contaminated sites, making the economical and efficient remediation of CHs-contaminated sites an important task. Chemical plant sites are most severely contaminated with CHs, which are important chemical raw materials widely used in pharmaceuticals, chemicals, electronics, leather tanning, automotive parts, and printing industries. During widespread use, accidental leaks, and improper discharges, CHs easily enter the groundwater environment, leading to severe groundwater CH contamination. Furthermore, most CHs are not easily biodegradable and can damage the liver, central nervous system, skin, and digestive system. Their decomposition products are also biotoxic. Therefore, CHs have been widely recognized as hazardous organic pollutants requiring priority control. Most CHs belong to DNAPL, characterized by a density higher than water and low solubility. Combined with their high O / W interfacial tension, they easily remain in the pores of the medium, making them difficult to remove. This results in long remediation times, low efficiency, and high costs for CHs-contaminated aquifers.

[0003] For sites contaminated with chlorinated hydrocarbons, the main remediation technologies currently include soil leaching, chemical oxidation, thermal desorption, gas-phase extraction, ambient temperature desorption, and bioremediation. Among these, soil leaching has attracted significant attention due to its advantages such as high pollutant removal rate, strong adaptability, simple operation, and controllable secondary pollution. Soil leaching involves using a liquid to elute pollutants from the soil in situ or ex-situ, dissolving and separating them, followed by treatment of the liquid. Water is the most commonly used liquid; when a surfactant is added, it is called surfactant leaching. Compared to water leaching alone, surfactants enhance the leaching process, significantly improving pollutant removal efficiency and shortening the remediation cycle.

[0004] Surfactants are substances that can significantly reduce the surface tension of liquids and the interfacial tension between liquids, and possess special properties. Their molecules consist of strongly hydrophilic polar groups (such as -OH, -COOH, -SO3H, and -NH2) and strongly hydrophobic nonpolar groups (such as R- and Ar-), exhibiting both hydrophilic and lipophilic properties. They are easily adsorbed and oriented onto material surfaces, exhibiting a series of properties such as penetration, wetting, emulsification, dispersion, and solubilization. Based on the type of charge of the hydrophilic ions after hydrolysis, they are classified into four categories: anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants. Extensive laboratory and field research both domestically and internationally has shown that the ideal characteristics of surfactants suitable for soil remediation should include: good biodegradability and environmental compatibility, high solubilization capacity, resistance to interference from aquifer ions, low cost, and simple and mature production processes.

[0005] Currently, common methods for reducing the loss of solubilizing materials mainly include comparative screening and compounding. Comparative screening of solubilizing materials involves using a specific characteristic of the solubilizing material as a screening criterion based on the environmental conditions of use, thus ignoring other shortcomings to select the desired material. Most solubilizing materials have their own advantages and disadvantages depending on their properties. For example, sodium dodecyl sulfate (SDS), an anionic surfactant commonly used in site remediation, has the advantage of low media adsorption, but it is prone to salting out or low-temperature precipitation; the nonionic surfactant Tween 80 has the advantage of low-temperature resistance, but because the micelles it forms are uncharged, they tend to adsorb heavily onto the aquifer medium. Therefore, surfactants obtained through comparative screening cannot completely meet all the requirements for underground environments. Compounding of solubilizing materials involves adding other surfactants or short-chain alcohols with complementary properties to the main surfactant to form a composite material. This allows the surface active material to retain the advantages of the main surfactant while improving and compensating for its shortcomings.

[0006] However, analysis of surfactants widely used over the past few decades reveals that it's difficult for a single surfactant to excel in all of the aforementioned properties simultaneously. Each surfactant has its prominent advantages and relatively weak characteristics. For example, AMA and AOT have strong solubilizing abilities but exhibit high biotoxicity and poor biodegradability. Dowfax 8390, SDS, and SDBS possess strong anti-adsorption properties and good biodegradability, but their solubilizing performance is relatively poor. Tween 80, on the other hand, has good solubilizing properties and environmentally friendly characteristics, but it suffers from easy adsorption, high viscosity, and difficulty migrating in aquifer media. Furthermore, in recent years, the green performance of remediation agents has become increasingly important, with biodegradability and environmental friendliness being particularly crucial for surfactants applied to soil remediation. Therefore, the use of easily degradable and environmentally friendly surfactants has become even more critical. Numerous studies have explored the formulation of different surfactants to obtain solubilizing materials with a wider range of superior properties. Formulated surfactants compensate for the shortcomings of single surfactants in achieving the desired remediation effect through synergistic solubilizing effects, thereby improving surfactant utilization efficiency, enhancing the elution of pollutants in the soil, and effectively reducing pollution remediation costs. Under certain conditions, compound surfactants can produce a synergistic effect. The main reasons are: (1) Compound surfactants can form mixed micelles and mixed adsorption layers, which weakens the repulsion between surfactants and makes micelles easier to form, thereby greatly reducing the CMC value of the mixed surfactants; (2) The partition coefficient of pollutants in the micelles of compound surfactants will increase, thereby improving the solubilization effect; (3) The low colloidal core polarity and high outer negative charge of compound surfactants inhibit hydrogen bonding and electrostatic interaction, reducing adsorption loss.

[0007] Patent CN 102491497 A utilizes kitchen waste cooking oil, anionic surfactant rhamnolipin, and nonionic surfactant Triton X-100 (polyethylene glycol octylphenyl ether) in a certain proportion to form a chlorinated hydrocarbon solubilizing emulsion, which improves the solubility of chlorinated organic pollutants by biosurfactants. However, the preparation of this solubilizing emulsion requires adjusting the solution pH to 10-13. Applying chlorinated hydrocarbons to soil remediation alters the original soil environment, creating a risk of saline-alkali soil. Furthermore, the solubilizing emulsion requires the introduction of additional oil, which constitutes secondary pollution relative to the soil and aquifer, and increases remediation costs.

[0008] Patent CN 111995551 A describes the synthesis of ethylene glycol bismaleic acid fatty alcohol polyoxyethylene ether diester sulfonate Gemin i surfactant (GEOnS-12, n=3, 5, 7) using corn cob as an active ingredient in a slow-release material. When dissolved in water, it forms negatively charged micelles at concentrations higher than the critical micelle concentration. The aqueous solution has low viscosity, and hydrophobic chlorinated hydrocarbons such as PCE enter the micelles, thereby increasing the apparent solubility of pollutants in water. However, due to its complicated synthesis process and poor biodegradability of the surfactant, its application in soil leaching can easily cause secondary pollution.

[0009] Patent CN 117263305 A utilizes a compound of alkyl glycoside (APG) 1214, sodium chloride, n-propanol, and isobutanol in a specific ratio for the efficient remediation of aquifers contaminated with chlorinated hydrocarbons. However, the removal efficiency of this desorption material for chlorinated hydrocarbons needs improvement. Furthermore, in actual contaminated sites, chlorinated hydrocarbons typically exist as a mixture of pollutants, and selective desorption is highly likely to occur in sites containing multiple chlorinated hydrocarbons, resulting in poor remediation outcomes. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to provide a highly efficient solubilizing surfactant for chlorinated hydrocarbons, its application and preparation method.

[0011] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0012] This invention provides a highly efficient solubilizing surfactant for chlorinated hydrocarbons, wherein the surfactant comprises decaethylene glycol monododecyl ether, Tween 20, and water.

[0013] Based on the above technical solution, the present invention can be further improved as follows.

[0014] Furthermore, based on the mass of the surfactant, the mass percentage of the decaethylene glycol monododecyl ether is 0.10% to 1.46%, the mass percentage of the Tween 20 is 0.10% to 1.46%, and the balance is water.

[0015] Furthermore, the mass ratio of the decaethylene glycol monododecyl ether to the Tween 20 is 1:1.

[0016] Furthermore, the decaethylene glycol monododecyl ether has a mass percentage of 0.79%, the Tween 20 has a mass percentage of 0.79%, and the remainder is water.

[0017] The present invention also provides a method for preparing the chlorinated hydrocarbon highly efficient solubilizing surfactant as described above, characterized in that the decaethylene glycol monododecyl ether, the Tween 20 and water are mixed and stirred until an emulsion is formed to obtain the surfactant.

[0018] The present invention also provides an application of the surfactant as described above, wherein the surfactant is used to solubilize chlorinated hydrocarbon organic pollutants in soil.

[0019] The present invention also provides a method for remediating contaminated sites, including the step of using a surfactant as described above to solubilize chlorinated hydrocarbons in the contaminated site, wherein the contaminated site includes soil, groundwater, and surface water.

[0020] Furthermore, the solid-liquid volume-to-mass ratio between the amount of surfactant added and the chlorinated hydrocarbon-contaminated soil is 10:1-15:1.

[0021] The beneficial effects of this invention are as follows:

[0022] (1) The present invention provides a highly efficient solubilizing surfactant for chlorinated hydrocarbon organic pollutants. When decaethylene glycol monododecyl ether and Tween 20 are mixed, they can produce mixed micelles, which can increase the solubility of chlorinated hydrocarbons in water, thereby dissolving chlorinated hydrocarbons that are originally insoluble or have very low solubility in water into micelles.

[0023] (2) The highly efficient solubilizing surfactant for chlorinated hydrocarbon organic pollutants of the present invention, which is a combination of decaethylene glycol monododecyl ether and Tween 20, can significantly reduce the CMC value of the mixed surfactant, thereby effectively reducing the amount of surfactant added and reducing the remediation cost;

[0024] (3) The highly efficient solubilizing surfactant for chlorinated hydrocarbon organic pollutants of the present invention has the characteristics of good biodegradability, high efficiency solubilizing ability and low cost, so as to reduce secondary pollution while treating environmental pollutants. Attached Figure Description

[0025] Figure 1 As a highly efficient solubilizing surfactant for chlorinated hydrocarbon organic pollutants of the present invention, Example 2 shows the surface tension changes of surfactant solutions with different compound concentrations;

[0026] Figure 2 As a highly efficient solubilizing surfactant for chlorinated hydrocarbon organic pollutants of the present invention, Example 3 shows a comparison of the Zeta potentials of surfactant solutions with different compound concentrations;

[0027] Figure 3 Example 4 shows a comparison of the concentrations of mixed chlorinated hydrocarbons in solutions of different concentrations of the compound surfactant, which is a highly efficient solubilizing surfactant for chlorinated hydrocarbon organic pollutants according to the present invention.

[0028] Figure 4 Example 5 shows a comparison of the solubilizing properties of surfactant solutions with different compound systems for mixed chlorinated hydrocarbons, which is a highly efficient solubilizing surfactant for chlorinated hydrocarbon organic pollutants according to the present invention.

[0029] Figure 5 Example 6 shows a comparison of the solubilizing properties of the compound surfactant for single chlorinated hydrocarbons and mixed chlorinated hydrocarbons, which is a highly efficient solubilizing surfactant for chlorinated hydrocarbon organic pollutants according to the present invention. Detailed Implementation

[0030] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0031] The present invention provides a highly efficient solubilizing surfactant for chlorinated hydrocarbon organic pollutants, the components of which include decaethylene glycol monododecyl ether, Tween 20 and water.

[0032] The surfactant of this invention uses decaethylene glycol monododecyl ether and Tween 20 as the main active ingredients, which are compounded in a certain proportion to produce mixed micelles, forming a mixed adsorption layer. This weakens the repulsive force between the two, making micelles easier to form. In the micelles, the lipophilic tails of the surfactant molecules aggregate inside the micelles, avoiding contact with polar water molecules; while the polar hydrophilic heads of the molecules are exposed on the outside, interacting with polar water molecules and protecting the hydrophobic groups inside the micelles. Based on the principle of "like dissolves like," the mixed micelles can increase the solubility of chlorinated hydrocarbons in water, thereby dissolving chlorinated hydrocarbons that are originally insoluble or have very low solubility in water into the micelles. Furthermore, the compounding of the two in a certain proportion weakens the repulsive force between them, making micelles easier to form, thus significantly reducing the CMC value of the mixed surfactant, further reducing the amount of surfactant added, and lowering the remediation cost. The partition coefficient of chlorinated hydrocarbons in the mixed micelles also increases, further improving the solubilizing effect of the surfactant. Therefore, the surfactant prepared by this invention has the characteristics of good biodegradability, high efficiency solubilization ability, and low cost, which can reduce secondary pollution while treating environmental pollutants.

[0033] Preferably, based on the mass percentage of the surfactant, the decaethylene glycol monododecyl ether is 0.10% to 1.46%, the Tween 20 is 0.10% to 1.46%, and the balance is water.

[0034] Preferably, the mass ratio of decaethylene glycol monododecyl ether to Tween 20 is 1:1.

[0035] Preferably, the mass percentage of decaethylene glycol monododecyl ether is 0.79%, the mass percentage of Tween 20 is 0.79%, and the balance is water.

[0036] More preferably, the surfactant of the present invention has a CMC value of 40 mg / L and a surface tension of 29.8 mN / m.

[0037] The present invention discloses a method for preparing a highly efficient solubilizing surfactant for chlorinated hydrocarbon organic pollutants, wherein decaethylene glycol monododecyl ether, Tween 20 and water are mixed and stirred until an emulsion is formed to obtain the surfactant.

[0038] The method for remediating contaminated sites according to the present invention includes the step of using the surfactant of the present invention to solubilize chlorinated hydrocarbons in the contaminated site, wherein the contaminated site includes soil, groundwater, and surface water.

[0039] Preferably, the solid-liquid volume-to-mass ratio between the amount of surfactant added and the soil contaminated with chlorinated hydrocarbons is 10:1-15:1.

[0040] The present invention will be specifically described below through specific embodiments.

[0041] Example 1

[0042] In this embodiment, a series of highly efficient solubilizing surfactants with different mass percentages were prepared. The total mass of the surfactants was 100%, including the following components: 0.10% to 1.46% decaethylene glycol monododecyl ether and 0.10% to 1.46% Tween 20, with the balance being deionized water.

[0043] The specific preparation process is as follows: Based on the total mass of the surfactant, add the above-mentioned mass fractions of decaethylene glycol monododecyl ether and Tween 20 to deionized water, stir for 2 hours, and mix thoroughly by inverting.

[0044] The specific configuration of this embodiment is shown in Table 1.

[0045] Table 1

[0046] deal with Concentration of decaethylene glycol monododecyl ether (%) Tween 20 concentration (%) 1 0.10％ 0.10％ 2 0.20％ 0.20％ 3 0.30％ 0.30％ 4 0.40％ 0.40％ 5 0.59％ 0.59％ 6 0.79％ 0.79％ 7 1.17％ 1.17％ 8 1.46％ 1.46％

[0047] Example 2

[0048] Taking the various compound surfactants from Example 1, aqueous solutions of decaethylene glycol monododecyl ether and Tween 20 with total mass concentrations of 5 mg / L, 10 mg / L, 15 mg / L, 20 mg / L, 30 mg / L, 40 mg / L, 60 mg / L, 80 mg / L, 100 mg / L, and 120 mg / L were prepared. The surface tension of the above compound surfactant solutions was measured, and the results are as follows: Figure 1 As shown.

[0049] according to Figure 1It can be seen that the critical micelle concentration (CMC) of the compound surfactant is 40 mg / L, and the surface tension can be reduced to 29.8 mN / m. This is lower than the CMC of single surfactants (110 mg / L for decaethylene glycol monododecyl ether and 60 mg / L for Tween 20), thus reducing the amount of surfactant required. The CMC of single surfactants can be found online. Figure 1 Not shown in the image.

[0050] Example 3

[0051] Each of the compound surfactants from Example 1 was used to prepare aqueous solutions with mass concentrations of 5 g / L, 10 g / L, and 15 g / L, respectively. The Zeta potential of the above surfactant solutions was measured, and the results are as follows: Figure 2 As shown.

[0052] according to Figure 2 It can be seen that the Zeta potential of surfactant solutions of all mass concentrations is negative.

[0053] Example 4: Test of the solubilizing ability of surfactants on mixed chlorinated hydrocarbons

[0054] In this embodiment, carbon tetrachloride (CT) and 1,2-dichloroethane (1,2-DCA) are mixed in a volume ratio of 1:1 to form a mixed chlorinated hydrocarbon organic pollutant.

[0055] Take 1.4 mL of mixed chlorinated hydrocarbons into a 42 mL borosilicate sample vial, and add 40 mL of the surfactants in each proportion from Example 1. Mix thoroughly by inverting the vial, and then place it in a constant temperature shaker and shake at 150 rpm for 24 h (25 °C). Use a Shimadzu LC-40D high performance gas chromatograph to determine the concentrations of carbon tetrachloride and 1,2-dichloroethane in the sample.

[0056] Compared to the concentrations of carbon tetrachloride (748.98 mg / L) and 1,2-dichloroethane (8173.93 mg / L) dissolved in pure water, the solubilization factors of various surfactant formulations for CT and 1,2-DCA were compared, and the results are as follows: Figure 3 As shown in Table 2.

[0057] according to Figure 3 As shown in Table 2, when the concentrations of decaethylene glycol monododecyl ether and Tween 20 are both 1.46%, the surfactant exhibits the highest solubility and solubilization factor for carbon tetrachloride and 1,2-dichloroethane. When the concentrations of decaethylene glycol monododecyl ether and Tween 20 reach 0.79%, the solubilization effect on mixed chlorinated hydrocarbons slows down with increasing surfactant concentration.

[0058] Table 2. Solubilizing ability of composite surfactants with different ratios for carbon tetrachloride and 1,2-dichloroethane

[0059]

[0060] Example 5: Test of the solubilizing effect of surfactants in different compound systems on mixed chlorinated hydrocarbons

[0061] Tween 80 was used instead of Tween 20 to prepare solubilizing materials, and the differences in the solubilizing effects of the two different compound surfactant systems on mixed chlorinated hydrocarbons were compared.

[0062] Compound surfactant 1 was prepared by adding 0.79% decaethylene glycol monododecyl ether and 0.20% Tween 80, using the same preparation method as in Example 1.

[0063] Compound surfactant 2 was prepared using a concentration of 0.79% decaethylene glycol monododecyl ether and 0.79% Tween 20, and the preparation method was the same as in Example 1.

[0064] The difference in solubilizing ability of the two compound surfactant systems for mixed chlorinated hydrocarbons was determined using the same method as in Example 2. The results are as follows: Figure 4 As shown, the combination system of decaethylene glycol monododecyl ether and Tween 20 has a better solubilizing effect on mixed chlorinated hydrocarbons.

[0065] Example 6: Test on the difference in solubilization ability of composite materials for single chlorinated hydrocarbons and mixed chlorinated hydrocarbons.

[0066] The compound surfactant 3 was prepared by adding 0.50% decaethylene glycol monododecyl ether and 0.50% Tween 20, using the same preparation method as in Example 1.

[0067] Carbon tetrachloride (CT) was used as the single chlorinated hydrocarbon organic pollutant. 0.7 mL of mixed chlorinated hydrocarbons was placed in a 42 mL borosilicate sample vial, and 40 mL of the composite material from surfactants 3 and 4 was added. The mixture was then inverted and shaken at 150 rpm for 24 h (25℃) in a constant-temperature shaker. The concentration of carbon tetrachloride in the sample was determined using a Shimadzu LC-40D high-performance gas chromatograph.

[0068] Using 1,2-dichloroethane as a single chlorinated hydrocarbon organic pollutant, 0.7 mL of mixed chlorinated hydrocarbons was placed in a 42 mL borosilicate sample vial, along with 40 mL of the composite material from surfactants 3 and 4. The mixture was then inverted and thoroughly mixed before being placed in a constant-temperature shaker and shaken at 150 rpm for 24 h (25 °C). The concentration of 1,2-dichloroethane in the sample was determined using a Shimadzu LC-40D high-performance gas chromatograph.

[0069] The differences in the solubilizing ability of compound surfactants for single and mixed chlorinated hydrocarbons were investigated, and the results are as follows: Figure 5As shown, in comparison, the solubilizing effect of the decaethylene glycol monododecyl ether and Tween 20 compound system on single and mixed chlorinated hydrocarbons is not significantly different, indicating that the compound system still maintains a good solubilizing effect in the presence of multiple chlorinated hydrocarbons.

[0070] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0071] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0072] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0073] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0074] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A highly efficient solubilizing surfactant for chlorinated hydrocarbons, characterized by, The surfactant comprises decaethylene glycol monododecyl ether, Tween 20, and water.

2. A high efficiency solubilizing surfactant of chlorinated hydrocarbons according to claim 1, characterized in that, The surfactant comprises, by mass percentage, 0.10% to 1.46% decaethylene glycol monododecyl ether, 0.10% to 1.46% Tween 20, and the remainder is water.

3. A high efficiency solubilizing surfactant for chlorinated hydrocarbons according to claim 2, characterized in that, The mass ratio of the decaethylene glycol monododecyl ether to the Tween 20 is 1:

1.

4. A high efficiency solubilizing surfactant of chlorinated hydrocarbons according to claim 3, characterized in that, The decaethylene glycol monododecyl ether has a mass percentage of 0.79%, the Tween 20 has a mass percentage of 0.79%, and the balance is water.

5. A process for the preparation of a high efficiency solubilizing surfactant for chlorinated hydrocarbons according to any one of claims 1 to 4, characterized in that, The surfactant is obtained by mixing and stirring the decaethylene glycol monododecyl ether, the Tween 20, and water until an emulsion is formed.

6. An application of the surfactant as described in any one of claims 1 to 4, characterized in that, The surfactant is used to solubilize chlorinated hydrocarbon organic pollutants in contaminated sites, including soil, groundwater, and surface water.

7. A method for remediating a contaminated site, characterized in that, The method includes the step of using a surfactant as described in any one of claims 1 to 4 to solubilize chlorinated hydrocarbons in a contaminated site, wherein the contaminated site includes soil, groundwater, and surface water.

8. A method for remediating a contaminated site according to claim 7, characterized in that, The solid-liquid volume-to-mass ratio between the amount of surfactant added and the chlorinated hydrocarbon-contaminated soil is 10:1-15:1.

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