بررسی شست وشوی خاک آلوده به ترکیبات نفتی با استفاده از شوینده سدیم دودسیل سولفات

نوع مقاله : مقالات پژوهشی

نویسندگان

1 گروه فنی و مهندسی، دانشگاه پیام نور، تهران، ایران

2 دانشگاه پیام نور، شیراز، ایران

چکیده

از گذشته تا کنون جهت پاکسازی خاک‌های آلوده به هیدروکربن‌ها از روش‌‌های متفاوت استفاده گردیده است که هرکدام از این روش‌ها دارای محاسن و معایب خاص خود بوده و شامل قابلیت‌هایی ویژه‌ می‌باشند. در این پژوهش قابلیت روش شست‌وشو با استفاده از شوینده یونی سدیم ‌دودسیل ‌سولفات و همچنین شناسایی عوامل مؤثر بر راندمان آن جهت کاهش کل هیدروکربن‌های نفتی خاک آلوده به روغن قطران بررسی گردید. برای این امر خاک بکر از منطقه صنعتی شهرک رازی اصفهان تهیه و با استفاده از روغن قطران به صورت تعمدی آلوده گردید. زمان ماند، دما، غلظت شوینده و غلظت آلاینده به عنوان متغیرهای این مطالعه در نظر گرفته شدند. بررسی نشان داد خاک منطقه دارای بافت شنی رسی لومی بود. پس از زمان ماند 21 روز، میزان آلودگی آن 26776‌ میلی‌گرم در هر کیلوگرم خاک اندازه‌‌گیری شد. با استفاده از پایلوت صنعتی خاک‌شویی در شرایط متفاوت انجام گردید. نتایج حاصل از اندازه‌گیری نمونه‌های شسته‌ شده نشان داد، استفاده از محیط شست‌و‌شوی دارای آب خالص و دمای30 ‌درجه سانتی‌گراد از موفقیت چندانی برخوردار نمی‌باشد، ولی افزایش دما تا۹۰ ‌درجه سانتی‌‌گراد موجب افزایش راندمان 5/18 درصدی و همچنین افزودن میزان تا ۴ گرم بر لیتر ماده شست‌وشو دهنده موجب افزایش ۴۰ درصدی راندمان است. تغییرات زمان ماند هم بر راندمان حذف هیدروکربن تاثیر داشت. در کل بررسی نتایج، شرایط بهینه را دمای ۹۰ درجه، زمان ۲۰ دقیقه و میزان ۴ گرم بر لیتر سورفکتانت با راندمان ۶۱ درصد مشخص نمود که این نتیجه حاکی از مناسب بودن روش جهت کاهش آلودگی این نوع از خاک می‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of Soil Washing Infected with Petroleum Compounds Using Sodium Dodecyl Sulfate

نویسندگان [English]

  • E. Asrari 1
  • H. Talebi 2
1 Department of Civil Engineering, Payame Noor University, Tehran, Iran
2 Depertment of Civil Engineering , Payame Noor University, Shiraz, Iran
چکیده [English]

Introduction
 In the last few decades, due to process of shifting from traditional activities and based on manual activities to industrial ones, the need for using oil and coal and its derivatives has increased. Using these materials has caused some problems for environment as hydro carbon contamination. Soil is a major contributor to the various kinds of pollution, especially hydro carbon pollution. Due to the importance of soil in the life cycles and its vitally direct and indirect influence on all the organisms and human being, elimination of this pollutant is necessary. For this reason, some different methods have been developed. In this research, capability of soil washing by sodium dodecyl sulfate ionic detergent has been measured. In order to fulfill the existing necessity and solve this problem, a wide-ranging effort has been started from the past until now, which can be referred to the issue of washing contaminated soil as one of the issues raised. At the beginning of this technology, washing with pure water was considered and after a while, it was invalidated due to inefficiency in the tested cases. With advances in this emerging technology, the discussion of stronger solvents was explored, in which detergents became more attractive due to their lower potential toxicity and environmental degradability. Actually, the effect of major parameters on removing the hydrocarbons has been investigated and in this research has been afforded to purify polluted soil with creosote by considering actual conditions in industry.
Materials and Methods
 The first sample has been taken from original soil of Razi industrial estate. It has coarse sandy loam texture with 31% clay, 11% silt and 57% of sand, pH equal 7, organic matter amount 2.3 % weight and density equal 1/8 gram per m3. Therefore, pure soil was extracted from 6 layers of soil to the depth of 0.5 m from Razi industrial area in Isfahan. Then, it was mixed by a concrete mixer specific to the block making. Afterwards, creosote was added evenly during stirring so the soil was contaminated deliberately. After storing in the laboratory for 3 weeks and homogeneity, the initial sample was chosen and its contamination was measured. This measurement was based on the amount of added oil to the certain volume of soil (about 30000 milligram in each kilogram). For avoiding error and having assurance from the amount of initial contamination, the sample was transferred to the laboratory and 25 gr of it was taken. Its hydrocarbon texture was extracted by solvent and its polar compositions were removed by passing on the silica gel absorbent. Then, a hydrocarbon was measured. The real pollutant amount of sample was 26776 milligram in each kilogram of soil. Secondary samples were chosen from basic sample, these chosen samples were washed under the different planned conditions. After finishing several complementary washing stages in different conditions, the soil samples remaining from washing were dried under different conditions. Then the amount of remained contamination in each sample was measured and recorded separately. At the next stage, the recorded results were analyzed. Stay time, temperature, pollutant concentration and washer concentration has been chosen as variable parameters.
 
 Results and Discussion
 According to the results, washing by pure water and temperature of 30°C would not be successful but by increasing temperature, the removing efficiency increased. Increasing temperature to 90°C increased the efficiency up to 18.5%. In addition, adding detergent to the environment increased the success of this method in reducing sample pollution. Increasing efficiency up to 4 g/L of detergent increased the efficiency up to 40% directly, but there was no significant change for increasing more than this amount. At this stage, the results showed that in the presence of detergent, increasing temperature caused to increase efficiency directly. The only difference was that increasing temperature (without detergent) increased efficiency directly, but in presence of detergent, increasing efficiency was significance up to 50% and after that it increased very slightly. The last studied parameter was time. These changes included increasing efficiency due to increasing time from 10 min to 20 min. Removing pollutant efficiency has been reduced by increasing time. Under all optimum conditions, in temperature of 90°C for 20 minutes and 4 g/L surfactant, Hydrocarbon removing efficiency was 61%. The economically optimum temperature is 50oC with regard to economical cases and the slight difference resulting from increase of temperature from 50 to 90°C.
Conclusion
 Generally, the results revealed the suitability of ionic sodium dodecyl sulfate for cleaning soil under conditions of contamination. But 39 % of pollutant in polluted soil after washing by considering optimal conditions has been reminded. It must be mentioned that due to inefficiency of this amount of contamination reduction from contaminated soils for the discharge of these soils into the environment, this method can be introduced as a pollution reduction or a method for pretreatment of complementary methods.

کلیدواژه‌ها [English]

  • Contaminated soil
  • Creosote
  • Soil washing
  • Surfactant
1- Andalib Moghadam H. 2008. Study of the efficiency of the thumb method soil washing to clean oil contaminated soil. Amir kabir rasbi university, Tehran. (In Persian with English abstract)
2- Bhandari A., Novak J., and Dove D. 1999. effect of soil washing on petroleum hydrocarbons distribution on sand surfaces. Journal of Hazardous Substance Research 2: 1-7. https://doi.org/10.4148/1090-7025.1017.
3- Catherine N., Mulligan C., and Eftekhari F. 2003. Remediation with surfactant foam of PCP- contaminated soil. Engineering Geology, 70:269-279. https://doi.org/10.1016/S0013-7952(03)00095-4.
4- Chalkesh Amiri M. 2008. Surface active materials. Arkan danesh publications, Tehran. (In Persian)
5- Deshpande S., Shiau B., Wade D., Sabatini D and Harwell J. 1999. Surfactant selection for enhacing ex situ soil washing. Water Reserch 33(2): 351-360. https://doi.org/10.1016/S0043-1354(98)00234-6.
6- Daveza M., Fabari D., Prevot A.B., and Pramauro E. 2011. Removal of alkyphenols from polluted sites using and photocatalysis. Environmental Science and Pollution Research 8: 783-789. https://doi.org/10.1007/s11356-010-0427-7.
7- Hedayati M. 2010. Effectiveness of leaching metod for cleaning soils contaminated with petroleum hedrocarbons with emphasis on BTEXcompounds. envaironment university, Tehran. (In Persian with English abstract)
8- Hosnani M., Amani H., and Sarmasti M. 2019. Removal of crude oil from a contaminated soil using offsite SDS surfactant. Journal of  Environmental Science and Technology 21(3): 37-46. (In Persian with English abstract) https://jest.srbiau.ac.ir/article_14541./10.22034/JEST.2019.14541.
9- Kile D.E., Chiou C.T. 1989. Water solubility enhancement of DDT and trichlorobenzene by some surfactants below and above the critical micelle concentration. Environmental Science Technology 23(7): 832-838. https://doi.org/10.1021/es00065a012.
10- Khosravi M. 2007. Petroleum chemistry. university of Tehran, Tehran. (In Persian)
11- Lau E.,Gan S., Kiat H., and Poh P. 2014. Extraction agents for the removal of polycylic aromatic hydrocarbons (PAHs) from soil in soil washing technologies. Environmental Pollution 184: 640-649. https://doi.org/10.1016/j.envpol.2013.09.010.
12- Liu J. 2018. Soil remediation using soil washing followed by ozone oxidation. Journal of Industrial and Engineering Chemistry 65: 31-34. https://doi.org/10.1016/j.jiec.2018.05.001.
13- Mulligan C., and Eftekhari F. 2003. Remediation with surfactant foam of PCP contaminated soil. Engineering Geology 70(3-4): 269-279. https://doi.org/10.1016/S0013-7952(03)00095-4.
14- Mehrasbi M., Shareat M., Haghighi B., and Ranjbar D. 2006. Biological cleaning of soils contaminated with  ethyl gasoline. telogen and naphtalene, Scientific Jornal of Zanjan University of Medical Sciences 14(54): 17-23. (In Persian with English abstract). https://ijhe.tums.ac.ir/article-1-5190-fa.html.
15- Melali A., Abasi M., Afyoni M., and Khosh Goftar A. 2011. Phytoremediation of petroleum hydrocarbon in isfahan refinery wastewater sludge. Journal of Agricultural Science and Technology and Natural Resources 15(56) :155-167. (In Persian with English abstract). http://jstnar.iut.ac.ir/article-1-1715-fa.html.
16- Peng S., Wu W., and Chen J. 2011. Removal of PAHs with surfactant- enhanced soil washing : influencing factors and removal effectiveness. Chemosphere 82(8): 1173-1177. https://doi.org/10.1016/j.chemosphere.2010.11.076.
17- Park B., and Son Y. 2017. Ultrasonic and mechanical soil washing processes for the removal of heavy metals from soils. Ultrasonic Sonochemistry 35: 640-625. https://doi.org/10.1016/j.ultsonch.2016.02.002.
18- Sherwood P.M.A. 1972. Vibrational spectroscopy of solids. university of Newcastle upon tyne, Newcastle.
19- Salehian A. 2008. Cleaning of diesel contaminated soils with the help of detergents. Tarbiat Modares University, Tehran. (In Persian with English abstract)
20- Shah S., Jamroz N., and Sharif Q. 2011. Micellization parameters and electrostatic interactions in micellar solution of  sodium dodecyl sulfate at different temperatures. Physicochemical and Engineering Aspects 178: 199-206. https://doi.org/10.1016/S0927-7757(00)00697-X.
21- Urum K., Pekdemir Y., and Copur M. 2003. Optimum conditions for washing of crude oil contaminated soil with biosurfactants solutions. Pocess Safety and Environmental Porotion 81(3):203-209. https://doi.org/10.1205/095758203765639906.
22- Urum K., Pekdemir T., and Copur M. 2004. Surfactants treatment of crude oil contaminated soils. Journal of Colloid and Interface Science 276: 456-464. https://doi/10.1016/g.gcis.2004.03.057.
23- Wang G., Zhang S., and Vigver M.G. 2018. Effect of soil washing with biodegredable chelators on the toxicity of residual metals and soil biologycal properties. Science of the Total Environment 625: 1021-1029. https://doi.org/10.1016/jscitotenv.2018.01.019.
24- Yang K., and Zho L. 2006. Enhanced soil washing of phenanthrene by mixed solution of TX100 and SDBS. Environmental Scienece Technonlogy 40(13): 4274-4280. https://doi.org/10.1021/es060122c.
25- Zhoe W., and Zhu B. 2008. Enhanced soil flushing of phenathrene by anionic-nonionic mixed surfactants. Water Research 42(2): 101-108. https://doi.org/10.1016/j.watres.2007.7.021.
CAPTCHA Image