CN103639186A - Method for reducing air pollution in soil remediation by cationic surfactant - Google Patents
Method for reducing air pollution in soil remediation by cationic surfactant Download PDFInfo
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Abstract
The invention provides a method for reducing air pollution in soil remediation by cationic surfactant. The invention relates to pretreatment technologies of soil organic pollution remediation techniques, and discloses a pretreatment method suitable for remediation of volatile organic pollutants in soil. The method comprises: step 1) preparing a cationic surfactant water solution with a concentration of 5.0-50g/L; step 2) spraying the prepared surfactant solution into organic polluted soil, and in terms of soil dry weight, keeping the adding amount of the surfactant in the soil at 0.5-5.0g/kg. According to the method provided by the invention, a small amount of the surfactant is directly sprayed into the organic polluted soil, and the operation is simple. The needed commercialized cationic surfactant is easily available. The method can obviously reduce volatilization of organic pollutants in soil, achieve a significant effect, and at the same time does not affect application of the subsequent remediation technology.
Description
Technical field
The present invention relates to the pretreatment technology of soil organic contamination recovery technique, applicable pre-treating method while relating in particular to volatile organic contaminant in rehabilitating soil.
Background technology
Trade effluent irrigation, solid waste landfill, agriculture chemical are used etc. and to be caused soil organic contamination day by day serious.The persistence organic pollutants such as the Polychlorinated biphenyls in soil, polycyclic aromatic hydrocarbon receive publicity especially because having extended residual, bioconcentration, half volatile and high toxicity, urgently repair in a large number containing the soil of this pollutant.At present, chemical reagent drip washing, thermal desorption, air lift technology, plant-microorganism combined remediation technology have all been widely applied in soil remediation engineering and have gone.But in these soil remediation technology, particularly in the process of based technique for in-situ remediation application, all be difficult to avoid volatile organic pollution to move from soil to air, cause secondary air pollution, to the crowd of surrounding area life, particularly recovery technique operating personnel have brought great health risk on the contrary.Therefore, need badly at present a kind of simple, do not affect again follow-up repairing effect fast, suppress organic contaminants in soil to the pre-treating method of air volatilization.
Summary of the invention
The present invention is directed to the problem existing in existing soil remediation technology, a kind of method of utilizing cationic surfactant to process organic polluted soil to be repaired is provided, the method processing procedure is simple, fast, significantly reduce the secondary air pollution in follow-up repair process, and do not affect follow-up repairing effect.
In order to solve the problems of the technologies described above, the present invention is solved by following technical proposals:
Utilize cationic surfactant to process the method for the treatment of contaminated soil, method is as follows:
Step 1): compound concentration is the aqueous solution of cationic surfactant active of 5.0-50 g/L;
Step 2): the surfactant solution of preparation is sprayed onto in organic polluted soil, and with soil dry restatement, in soil, the dosage of surfactant is 0.5-5.0 g/kg.Surfactant is directly sprayed onto in organic polluted soil on a small quantity, and operating process is very simple, and, utilize the volatilization of this method organic contaminants in soil significantly to reduce, successful, does not affect the application of follow-up recovery technique simultaneously.
As preferably, the content of organic matter in described organic polluted soil is 0 ~ 5%, and clay content is 5 ~ 40%.
When as preferably, described step 2) gained soil is used for connecting biological renovation method, the consumption of cationic surfactant is controlled at 0.5 ~ 1.0 g/kg.
When as preferably, described step 2) gained soil is used for connecting chemistry, physical contamination restorative procedure, the consumption of cationic surfactant is controlled at 0.5 ~ 5.0 g/kg.
As preferably, described cationic surfactant is any in bromination myristyl pyridine, dodecyl bromide pyridine, cetrimonium bromide.The effect of above-mentioned several cation surfactant is similar, is all to utilize " locking " effect to organic pollution of the surfactant of ADSORPTION STATE in soil, reduces organic pollution and volatilizees to air from soil.
The inventive method is before other conventional recovery techniques, first with cationic surfactant, process contaminated soil to be repaired, after simple process, just can significantly reduce the pollutant in soil in follow-up repair process and volatilize to air, reduce repair process and cause secondary air pollution.
The present invention, owing to having adopted above technical scheme, has significant technique effect:
1, the present invention is directly sprayed onto surfactant in organic polluted soil on a small quantity, simple to operate; Required is commercialization cationic surfactant, easily obtains; Utilize the volatilization of this method organic contaminants in soil significantly to reduce, successful, does not affect the application of follow-up recovery technique simultaneously.
2, the inventive method is with respect to not adopting pretreatment technology, directly carry out traditional original position physics, chemistry or bioremediation technology, this method, by the secondary air pollution significantly reducing in follow-up repair process, ensures surrounding area crowd, particularly recovery technique operating personnel's health.
Accompanying drawing explanation
Fig. 1 is that the present invention adopts cationic surfactant bromododecane yl pyridines (DDPB) to process the volatile quantity schematic diagram of acenaphthene contaminated soil acenaphthene after 10 days.
Fig. 2 is the affect state diagrams of different cationic surfactants on Soil Microorganism activity.
The specific embodiment
Below in conjunction with accompanying drawing 1 to accompanying drawing 2, with embodiment, the present invention is described in further detail:
embodiment 1
Soil, pyridines cationic surfactant dodecyl bromide pyridine (DDPB) that the acenaphthene pollution concentration of take is 50 mg/kg are example.In 4.5 kg dry soils, spray and add the DDPB aqueous solution that 500mL concentration is 50 g/L, the actual dosage of DDPB is that 5.0g/kg(is with soil dry restatement).In 4.5 kg dry soils, spray 500mL pure water in contrast, after this suitably add water every day and keep two groups of moisture content constant (weight method) simultaneously.Result demonstration, processing acenaphthene volatile quantity in the soil that sprays afterwards DDPB for 10 days is undressed 53.1%.
Soil, pyridines cationic surfactant dodecyl bromide pyridine (DDPB) that the acenaphthene pollution concentration of take is 50 mg/kg are example.In 4.5 kg dry soils, spray and add the DDPB aqueous solution that 500mL concentration is 5.0 g/L, the actual dosage of DDPB is that 0.5g/kg(is with soil dry restatement).In 4.5 kg dry soils, spray 500mL pure water in contrast, after this suitably add water every day and keep two groups of moisture content constant (weight method) simultaneously.Result demonstration, the Sino-Philippines volatile quantity of soil that DDPB is sprayed in processing for 10 days is afterwards undressed 82.7%.Under this concentration, DDPB does not all make significant difference (Fig. 2) to Soil Microorganism active (dehydrogenase activity), can not affect the degraded of follow-up microorganism to acenaphthene in soil.Therefore soil, after this concentration DDBP processes, can continue to connect bioremediation technology.
embodiment 3
Soil, quaternary cationic surfactant cetyltrimethyl ammonium (CTMAB) that the acenaphthene pollution concentration of take is 50 mg/kg are example.In 4.5 kg dry soils, spray and add the CTMAB aqueous solution that 500mL concentration is 50 g/L, the actual dosage of CTMAB is that 5.0g/kg(is with soil dry restatement).In 4.5 kg dry soils, spray 500mL pure water in contrast, after this suitably add water every day and keep two groups of moisture content constant (weight method) simultaneously.Result demonstration, processing acenaphthene volatile quantity in the soil that sprays afterwards CTMAB for 10 days is undressed 52.9%.
Soil, quaternary cationic surfactant cetyltrimethyl ammonium (CTMAB) that the luxuriant and rich with fragrance pollution concentration of take is 100 mg/kg are example.In 4.5 kg dry soils, spray and add the CTMAB aqueous solution that 500mL concentration is 50 g/L, the actual dosage of CTMAB is that 5.0g/kg(is with soil dry restatement).In 4.5 kg dry soils, spray 500mL pure water in contrast, after this suitably add water every day and keep two groups of moisture content constant (weight method) simultaneously.Result demonstration, the Sino-Philippines volatile quantity of soil that CTMAB is sprayed in processing for 10 days is afterwards undressed 42%.
embodiment 5
Soil, pyridines cationic surfactant dodecyl bromide pyridine (DDPB) that the luxuriant and rich with fragrance pollution concentration of take is 100 mg/kg are example.In 4.5 kg dry soils, spray and add the DDPB aqueous solution that 500mL concentration is 50 g/L, the actual dosage of DDPB is that 5.0g/kg(is with soil dry restatement).In 4.5 kg dry soils, spray 500mL pure water in contrast, after this suitably add water every day and keep two groups of moisture content constant (weight method) simultaneously.Result demonstration, the Sino-Philippines volatile quantity of soil that DDPB is sprayed in processing for 10 days is afterwards undressed 45.3%.
In a word, the foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (5)
1. utilize cationic surfactant to reduce the method for soil remediation Air Contamination, it is characterized in that, method is as follows:
Step 1): compound concentration is the aqueous solution of cationic surfactant active of 5.0-50 g/L;
Step 2): the surfactant solution of preparation is sprayed onto in organic polluted soil, and with soil dry restatement, in soil, the dosage of surfactant is 0.5-5.0 g/kg.
2. the method for utilizing cationic surfactant to reduce soil remediation Air Contamination according to claim 1, is characterized in that: the content of organic matter in described organic polluted soil is 0 ~ 5%, and clay content is 5 ~ 40%.
3. the method for utilizing cationic surfactant to reduce soil remediation Air Contamination according to claim 1, it is characterized in that: when described step 2) gained soil is used for connecting biological renovation method, the consumption of cationic surfactant is controlled at 0.5 ~ 1.0 g/kg.
4. the method for utilizing cationic surfactant to reduce soil remediation Air Contamination according to claim 1, it is characterized in that: when described step 2) gained soil is used for connecting chemistry, physical contamination restorative procedure, the consumption of cationic surfactant is controlled at 0.5 ~ 5.0 g/kg.
5. according to the cationic surfactant that utilizes described in claim 1 or 3 or 4, reduce the method for soil remediation Air Contamination, it is characterized in that: described cationic surfactant is any in bromination myristyl pyridine, dodecyl bromide pyridine, cetrimonium bromide.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106238449A (en) * | 2016-08-30 | 2016-12-21 | 樊之雄 | A kind of restorative procedure of heavy-metal contaminated soil |
| CN112169244A (en) * | 2020-10-11 | 2021-01-05 | 甘肃银光聚银化工有限公司 | Method for rapidly treating leaked toluene diisocyanate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106238449A (en) * | 2016-08-30 | 2016-12-21 | 樊之雄 | A kind of restorative procedure of heavy-metal contaminated soil |
| CN112169244A (en) * | 2020-10-11 | 2021-01-05 | 甘肃银光聚银化工有限公司 | Method for rapidly treating leaked toluene diisocyanate |
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