CN113020248A - Method for repairing DDTs (dichloro-diphenyl-trichloroethane) contaminated soil by using composite lotion and application of composite lotion - Google Patents
Method for repairing DDTs (dichloro-diphenyl-trichloroethane) contaminated soil by using composite lotion and application of composite lotion Download PDFInfo
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- CN113020248A CN113020248A CN202110542933.3A CN202110542933A CN113020248A CN 113020248 A CN113020248 A CN 113020248A CN 202110542933 A CN202110542933 A CN 202110542933A CN 113020248 A CN113020248 A CN 113020248A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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Abstract
The invention relates to a method for repairing DDTs (dichloro-diphenyl-trichloroethane) polluted soil by using a composite lotion and application thereof, belonging to the technical field of environmental chemistry; according to the invention, the plant is promoted to repair DDTs polluted soil by the synergistic composite lotion, and the solubilization of the DDTs with strong hydrophobicity is improved by the synergistic composite lotion compounded by the surfactant Tween80 and the green organic solvent ethyl lactate; the synergistic composite lotion is regularly applied to the soil in a spraying mode, the water content of the soil is strictly controlled to avoid the occurrence of percolation phenomenon, the synergistic composite lotion is beneficial to plant growth, the mixing, transmission and uniform distribution of effective components in the synergistic composite lotion are also beneficial, the secondary pollution risk is reduced, and the repair efficiency is improved. The method has the advantages of economy, high efficiency, easy operation, wide applicable soil types, capability of realizing in-situ remediation, small influence on the original environment, reduction of secondary pollution risk and contribution to soil recycling.
Description
Technical Field
The invention belongs to the technical field of environmental chemistry, and particularly relates to a method for repairing DDTs (soil dispersed Ts) polluted soil by using a composite lotion and application thereof.
Background
DDT (dichlorodiphenyl) with the chemical name 2,2-bis (p-chlorophenyl) -1,1,1-trichloroethane (2,2-bis (4-chlorophenyl) -1,1,1-trichloroethane) of the formula: c14H9Cl5. DDTs is a general term for DDT isomers and homologs, and mainly includes p, p ' -DDT, p ' -DDD, p ' -DDE and the like. DDTs, a representative of organochlorine pesticides, have been widely used worldwide for controlling agricultural pests and malarial diseases. Although it has been banned for many years, DDT and its degradation products persist in soil due to its chemical stability and extreme hydrophobicity, with half-lives that can vary from a few years to a decade. For many years, these pesticide residues not only pose serious hazards to soil ecosystems and agricultural product safety, but also can potentially threaten human health through the food chain due to their high lipid solubility and bioaccumulation, low bioavailability and degradability, and "triple effect". Contamination of DDTs remains a global problem and has been listed in stockholm convention, one of the 12 persistent organic pollutants that is prohibited or restricted from use around the world. Therefore, the treatment and remediation of DDTs contaminated soil is one of the research hotspots and difficulties in the environmental field.
The existing treatment technology of DDTs polluted soil mainly comprises physical remediation, chemical remediation and biological remediation.
Phytoremediation is a remediation technique that utilizes plant degradation, metabolism, transformation, and its rhizosphere microbial ecological functions. The phytoremediation has the advantages of low cost, good effect, no secondary pollution, small side effect on human and environment and the like, and can be directly used for in-situ remediation, thereby becoming one of the remediation modes of the polluted soil with great potential. Plants play a role in the repair process primarily through two processes:
A. rhizosphere degradation, namely improving the activity of soil microorganisms around the rhizosphere and promoting the degradation of organic pollutants;
B. the absorption and transportation of organic pollutants by plants.
The degradation of DDTs by plants is mainly characterized in that under the catalysis of a P450 enzyme system, a peroxidase system, a dehalogenase system and the like, benzene rings and alkyl are hydroxylated to become activated water-soluble cytotoxin, and then the activated water-soluble cytotoxin is conjugated with glutathione, glucose and other forms of conjugated substances and is transported to vacuoles and the like by transporters. The residual concentration of the DDTs is an important factor influencing the phytoremediation effect, the low concentration is not beneficial to the absorption and enrichment of the DDTs by plants, the high concentration can generate toxic action to be not beneficial to the degradation of the plants, and both the DDTs and the DDTs can reduce the phytoremediation effect.
Although the organic polluted soil treated by the phytoremediation technology has the characteristics of easiness in operation, low cost, no secondary pollution and the like, the DDTs with extremely strong hydrophobicity are easily and strongly adsorbed by the soil, and the slow release of the DDTs from a soil solid phase to a soil solution seriously limits the plant availability and the phytoremediation speed, so that the increase of the solubility of the DDTs in water improves the microorganism/plant availability, and becomes a key for improving the efficiency of phytoremediation of the DDTs polluted soil. In recent years, research focuses mainly on the aspects of repairing organic contaminated soil by combining a surfactant with a microbial remediation technology, or enhancing phytoremediation efficiency by only using a single surfactant or a surfactant, and the like, however, related researches on enhancing phytoremediation capability of DDTs contaminated soil by combining a degradable chemical surfactant with other surfactants are rarely reported.
Therefore, a safe and stable technical method capable of efficiently repairing DDTs-contaminated soil is urgently needed to be found.
Disclosure of Invention
The invention aims to provide a method for repairing DDTs (soil dispersed Ts) polluted soil by using a composite lotion and application thereof, so as to overcome the defects of the prior art.
In order to achieve the purpose, the method for repairing DDTs (soil dispersed Ts) polluted soil by using the compound lotion and the specific technical scheme of the application are as follows:
the method for repairing DDTs (soil dispersed piles) polluted soil by using the compound lotion comprises the following steps in sequence:
s1, sieving the polluted soil, adjusting the water content, applying fertilizers according to the standards of 35mg/kg of nitrogen, 25mg/kg of phosphorus and 30mg/kg of potassium, and supplementing nutrient solution every two weeks to avoid the possibility of nutrient stress in the growth process of rhizosphere microorganisms so as to ensure that plants can grow in the environment with sufficient mineral nutrients;
step S2, uniformly sowing the germination-accelerating and white-exposed ryegrass seeds in a flowerpot, and starting thinning after 2 weeks of pot culture, wherein the pot culture period is 90 d;
and S3, spraying a synergistic compound lotion which is formed by mixing Tween80 and ethyl lactate according to a certain proportion into the soil from the thinning, spraying once every 8 days to remove DDTs in the soil, and spraying by using a spraying pot.
Further, the contaminated soil was sieved through a 60 mesh sieve.
Furthermore, the water content of the soil is maintained to be 60% of the maximum water holding capacity in the field, the soil is sufficient in nutrients, and the normal growth of plants can be maintained.
Furthermore, in the synergistic compound lotion, the mass ratio of the Tween80 to the ethyl lactate is 1-5: 1.
Furthermore, in the synergistic compound lotion, the mass ratio of the Tween80 to the ethyl lactate is 2.5: 1.
Further, in step S2, ryegrass was grown at 25 ± 1 ℃ under daytime illumination, illumination intensity 15000lx, relative humidity 80%, 18 ± 1 ℃ under nighttime, no illumination, relative humidity 80%, with flowerpot positions randomly alternated every 2 days.
Further, in step S3, 160ml of synergistic compound lotion is sprayed to the soil polluted by 800g of DDTs every 8 days.
Further, in step S3, DDTs in soil contains 3 DDT monomers, p, p ' -DDT, p, p ' -DDD and p, p ' -DDE standards, respectively, with a purity of 98.0% or more, manufactured by dr.
The invention also provides application of the compound lotion in repairing DDTs polluted soil, which is used for repairing black soil DDTs pollution.
The invention also provides application of the compound lotion in repairing DDTs polluted soil, which is characterized by being used for repairing sandy soil DDTs pollution.
The method for repairing DDTs (dichloro diphenyl trichloroethane) polluted soil by using the composite lotion and the application thereof have the following advantages:
1) the method is safe, efficient, low in cost and easy to operate, and can realize in-situ repair;
2) according to the invention, the synergistic composite lotion is applied to the soil in a spraying mode, so that the active ingredients in the composite lotion are uniformly distributed in soil particles, and the treatment effect is improved;
3) the water content of the soil selected by the invention is about 60% of the maximum water holding capacity of the soil field, and the water content is beneficial to the growth of plants and the mixing and transmission of effective components in the synergistic compound lotion under the condition of the water content, so that the condition is closer to the actual field restoration condition;
4) the Tween80 is a typical polyoxyethylene type nonionic surfactant, has the characteristics of small influence by soil charge, pH and other environments, easy biodegradation, low ecological toxicity to plants and the like, so that Tween80 has small adsorption loss in soil, has high concentration for effectively solubilizing DDTs in a soil-water remediation system, is favorable for improving the apparent solubility of the DDTs, and enhances the absorption of the DDTs by the plants and the degradation of the DDTs in rhizosphere soil; the ethyl lactate is used as a biodegradable 'green' organic solvent, and the synergistic effect of the composite eluent can be further improved;
the restoration process of the invention has little influence on the original environment, is suitable for a wide range of soil types, greatly reduces the risk of secondary pollution when being used for restoring the actual environment, is safe and friendly to the ecological environment, and is beneficial to the subsequent cyclic utilization of the soil.
Drawings
FIG. 1 is a graph of comparative experimental data for three different treatments of black soil in example 1.
FIG. 2 is a graph showing comparative experimental data for three different treatments of sand in example 2.
FIG. 3 shows the data of Tween 80-ethyl lactate and ethyl lactate in the solubilization experiment of DDT.
FIG. 4 shows the elution experiment data of Tween 80-ethyl lactate and ethyl lactate on DDT contaminated soil (black soil).
Detailed Description
For better understanding of the purpose, structure and function of the present invention, the method for remedying DDTs-contaminated soil with a composite lotion and the application thereof will be described in further detail with reference to the accompanying drawings.
According to the invention, the plant is promoted to repair DDTs polluted soil by the synergistic composite lotion, and the solubilization of the DDTs with strong hydrophobicity is improved by the synergistic composite lotion compounded by the surfactant Tween80 and the green organic solvent ethyl lactate;
the synergistic composite lotion is regularly applied to the soil in a spraying mode, the water content of the soil is strictly controlled to avoid the occurrence of percolation phenomenon, the synergistic composite lotion is beneficial to plant growth, the mixing, transmission and uniform distribution of effective components in the synergistic composite lotion are also beneficial, the secondary pollution risk is reduced, and the repair efficiency is improved.
Firstly, performing conventional pretreatment on soil, determining the content of DDTs in the soil, and determining the main components and the usage amount of the synergistic composite lotion according to the content; sieving the polluted soil by a 60-mesh sieve, and adjusting the water content of the polluted soil; and then, uniformly sowing the ryegrass seeds with full particles and consistent sizes in soil after germination acceleration and white exposure, thinning the seedlings after 2 weeks of pot culture, and periodically applying a Tween 80-ethyl lactate compound lotion to the soil in a spraying manner to realize the remediation of the DDTs-polluted soil.
Example 1:
three comparative experiments with different treatment modes are set, and experimental data are detailed in the attached figure 1 of the specification:
CK: the pollution level is equal, no plant is produced, and no synergistic compound lotion sample is produced;
t1: the pollution level and the plant are equal, and no synergistic compound lotion sample exists;
t2: a certain amount of samples of the synergistic combination lotion were applied regularly, and the specific experimental procedures are given below.
800g of polluted soil (black soil) with the pollution concentration of DDTs (soil data records) of 2.38mg/kg, and adjusting the water content of the soil to be about 60 percent of the maximum field water capacity after sieving;
the fertilizer is applied according to the standards of 35mg/kg of nitrogen, 25mg/kg of phosphorus and 30mg/kg of potassium respectively, and the nutrient solution is supplemented every two weeks, so that the possibility of nutrient stress in the growth process of rhizosphere microorganisms is avoided, and the plant can grow in the environment with sufficient mineral nutrients;
uniformly sowing the germination-accelerating and white-exposed ryegrass seeds in a flowerpot, and starting thinning after 2 weeks of pot culture, wherein the pot culture period is 90 d;
the Tween80 and ethyl lactate are compounded into a synergistic lotion according to the mass ratio of 2.5:1, namely the Tween80 and the ethyl lactate have the concentrations of 250mg/L and 100mg/L respectively. After the ryegrass grows for 2 weeks, 160ml of synergistic compound lotion is applied to the soil every 8 days by adopting a spraying mode, the water content of the soil is strictly controlled, the percolation phenomenon is avoided, and the whole restoration process is carried out under the conditions of 25 +/-1 ℃ (day, illumination intensity of 15000lx and relative humidity of 80%)/18 +/-1 ℃ (night, no illumination and relative humidity of 80%). The pot experiment lasts for 90 days, samples are taken at 30 days, 60 days and 90 days respectively, the DDTs concentration is analyzed by using a gas chromatography after the treatment, and the result shows that the removal rate of the DDTs treated by the method can reach about 51.7 percent after 90 days, and the repair efficiency is improved by about 20.5 percent compared with the repair by using the plants alone.
Example 2:
three comparative experiments with different treatment modes are set, and experimental data are shown in the attached figure 2 of the specification:
CK: the pollution level is equal, no plant is produced, and no synergistic compound lotion sample is produced;
t1: the pollution level and the plant are equal, and no synergistic compound lotion sample exists;
t2: a certain amount of samples of the synergistic combination lotion were applied regularly, and the specific experimental procedures are given below.
800g of polluted soil (sandy soil) with the pollution concentration of DDTs (soil conditioner) of 2.47mg/kg is sieved, and then the water content of the soil is adjusted to be about 60 percent of the maximum field water capacity;
the fertilizer is applied according to the standards of 35mg/kg of nitrogen, 25mg/kg of phosphorus and 30mg/kg of potassium respectively, and the nutrient solution is supplemented every two weeks, so that the possibility of nutrient stress in the growth process of rhizosphere microorganisms is avoided, and the plant can grow in the environment with sufficient mineral nutrients;
uniformly sowing the germination-accelerating and white-exposed ryegrass seeds in a flowerpot, and starting thinning after 2 weeks of pot culture, wherein the pot culture period is 90 d;
the Tween80 and ethyl lactate are compounded into a synergistic lotion according to the mass ratio of 2.5:1, namely the Tween80 and the ethyl lactate have the concentrations of 250mg/L and 100mg/L respectively. After the ryegrass grows for 2 weeks, 160ml of eluent is applied to the soil every 8 days by adopting a spraying mode, the water content of the soil is strictly controlled, the percolation phenomenon is avoided, and the whole restoration process is carried out under the conditions of 25 +/-1 ℃ (daylight, illumination intensity of 15000lx and relative humidity of 80%)/18 +/-1 ℃ (night, no illumination and relative humidity of 80%). The pot experiment lasts for 90d, samples are taken at 30 d, 60 d and 90d respectively, the DDTs concentration is analyzed by using a gas chromatography after the treatment, and the result shows that the removal rate of the DDTs treated by the method of the invention is improved by about 26.9 percent compared with that of the DDTs treated by using the plant alone after 90 d.
Solubilization experiment of Tween 80-Ethyl lactate on DDT
P, p' -DDT (DDT is used as a representative example of the organochlorine pesticide DDT unless otherwise specified). A batch equilibrium oscillation method is adopted, ethyl lactate with 0-1000 mg/L series concentration and 250mg/L Tween80 are compounded, DDT slightly larger than the saturated dissolution amount is added into a certain amount of compounded solution, and a solubilization experiment is carried out on the DDT.
As shown in the attached FIG. 3 of the specification, ethyl lactate alone has a relatively obvious solubilizing effect on DDT, but the apparent solubility of DDT is not significantly different when the concentration of the ethyl lactate is increased from 100mg/L to 1000 mg/L. The apparent solubility of DDT in the Tween 80-ethyl lactate composite lotion is obviously improved compared with the apparent solubility of DDT under the action of 250mg/L Tween80 or single ethyl lactate. For example, when the concentration of ethyl lactate in the mixed solution is 100mg/L, the apparent solubility of DDT in the mixed solution is about 1.5 times that of 250mg/LTween80 alone and about 6.9 times that of 100mg/L ethyl lactate alone. The ethyl lactate and the Tween80 generate synergistic solubilization effect on the DDT, and the addition of the ethyl lactate improves the solubilization capacity of the Tween 80-ethyl lactate compound lotion on the DDT.
Elution experiment of Tween 80-ethyl lactate on DDT (dichloro-Diphenyl-Trichloroethane) polluted soil
The experiment adopts a batch balance oscillation method, 0-1000 mg/L ethyl lactate with series concentration is compounded with 250mg/L Tween80, and elution experiment is carried out on a polluted soil (black soil) sample with the DDT pollution level of 2.38 mg/kg.
As shown in the attached figure 4 of the specification, single ethyl lactate has a certain elution effect on DDT contaminated soil samples, but the elution rate of DDT does not change significantly as the concentration of ethyl lactate is increased from 100mg/L to 1000 mg/L. The elution rate of DDT under the action of Tween 80-ethyl lactate compound lotion is obviously improved compared with the elution rate of DDT under the action of 250mg/LTween80 or single ethyl lactate. For example, when the concentration of the ethyl lactate in the compound lotion is 100mg/L, the elution rate of the DDT is 1.4 times under the action of 250mg/L Tween80 and 2.6 times under the action of 100mg/L single ethyl lactate. The addition of ethyl lactate improves the elution capacity of the Tween 80-ethyl lactate composite lotion on DDT contaminated soil.
The method has the advantages of economy, high efficiency, easy operation, wide applicable soil types, realization of in-situ remediation, small influence of the remediation process on the original environment, great reduction of secondary pollution risk when being used for actual environment remediation, and contribution to subsequent soil recycling.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. The method for repairing DDTs (soil dispersed piles) contaminated soil by using the compound lotion is characterized by comprising the following steps in sequence:
s1, sieving the polluted soil, adjusting the water content, applying fertilizers according to the standards of 35mg/kg of nitrogen, 25mg/kg of phosphorus and 30mg/kg of potassium, and supplementing nutrient solution every two weeks to avoid the possibility of nutrient stress in the growth process of rhizosphere microorganisms so as to ensure that plants can grow in the environment with sufficient mineral nutrients;
step S2, uniformly sowing the germination-accelerating and white-exposed ryegrass seeds in a flowerpot, and starting thinning after 2 weeks of pot culture, wherein the pot culture period is 90 d;
and S3, spraying a synergistic compound lotion mixed by Tween80 and ethyl lactate according to a certain proportion into the soil from the thinning, and spraying the synergistic compound lotion once every 8 days to remove DDTs in the soil.
2. The method for remediating soil contaminated with DDTs as recited in claim 1, wherein the contaminated soil is sieved with a 60 mesh sieve.
3. The method for remediating soil contaminated with DDTs with composite lotion according to claim 1, wherein the water content of the soil is maintained at 60% of the maximum water capacity in the field.
4. The method for remediating soil contaminated by DDTs with composite detergent as claimed in claim 1, wherein the mass ratio of Tween80 to ethyl lactate in the synergistic composite detergent is 1-5: 1.
5. The method for remediating soil contaminated by DDTs with composite lotion according to claim 4, wherein the mass ratio of Tween80 to ethyl lactate in the synergistic composite lotion is 2.5: 1.
6. The method for remediating soil contaminated with DDTs with composite lotions according to claim 1, wherein ryegrass is grown at 25 ± 1 ℃, day light, illumination intensity 15000lx, relative humidity 80%, 18 ± 1 ℃, night, no light, relative humidity 80% and randomly alternating flowerpot positions every 2d in step S2.
7. The method for remediating soil contaminated by DDTs with composite lotion as claimed in claim 1, wherein 160ml of synergistic composite lotion is sprayed to 800g of soil contaminated by DDTs every 8 days in step S3.
8. The method for remediating soil contaminated with DDTs as recited in claim 1, wherein in step S3, the DDTs in the soil comprise 3 DDT monomers, p, p ' -DDT, p, p ' -DDD and p, p ' -DDE standards, respectively, having a purity of 98.0% or more, manufactured by dr.
9. The application of the compound lotion in repairing DDTs polluted soil is characterized in that the compound lotion is used for repairing the DDTs polluted black soil.
10. The application of the compound lotion in repairing DDTs polluted soil is characterized in that the compound lotion is used for repairing the DDTs polluted soil.
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