پاکسازی یک خاک رسی آلوده به ماده دی متیل فتالات با استفاده از روش الکتروکینتیک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه آبیاری و آبادانی، دانشکده مهندسی و فناوری، دانشگاه تهران. کرج، ایران.

2 گروه آبیاری و آبادانی، دانشکده مهندسی و فناوری، دانشگاه تهران; کرج، ایران

3 گروه صنایع غذایی، دانشکده مهندسی و فناوری، دانشگاه تهران، کرج، ایران

4 گروه آبیاری و آبادانی، دانشکده مهندسی و فناوری، دانشگاه تهران، کرج،ایران.

چکیده

در این کار تحقیقاتی پاکسازی یک خاک رسی آلوده به ماده آلاینده دی متیل فتالات از روش الکتروکنتیک مورد مطالعه قرار گرفت. ابتدا میزان حداکثر جذب این ماده به وسیله خاک مورد نظر تعیین گردید. پس از آن خاک آلوده با نسبت g/ mg 04/0 تهیه و به دستگاه الکتروکنتیک انتقال یافت. برای افزایش راندمان پاکسازی از محلولهای NaOH و Tween80 در مخزن آند استفاده گردید. علاوه بر آن یک آزمایش با آب مقطر به عنوان آزمایش مرجع هم انجام شد. مقادیر pH و EC مخازن آند و کاتد و حجم آب خروجی از خاک در طول آزمایش اندازه­گیری گردید. نتایج نشان داد  که در انتهای آزمایش pH در مخزن آند برابر با 8/4، 27/3 و 6/2 برای محلولهای NaOH و Tween80 و آب مقطر می­باشد و حجم مایع خروجی برای NaOH  1165 میلی­لیتر بود که برای سایر محلولها 20 درصد کمتر از آن بود. مقاومت خاک هم با افزایش فاصله از آند افزایش یافته و مقدار آن در اطراف کاتد 14 کیلوپاسکال برای NaOH حاصل گردید که نسبت به محلولهای آب مقطر و Tween80 به میزان 50 و 57 درصد بیشتر بود. نتایج پاکسازی نشان داد که درصد پاکسازی در کاتد کمتر از آند است. پاکسازی برای Tween80 در اطراف آند و کاتد به ترتیب 88/53 و 65/16 درصد می­­باشد. لیکن برای محلول NaOH این مقادیر به 82/50 و 26/23 درصد می­رسد. از طرفی برای آب مقطر انباشته شدن آلاینده به میزان 85/28 درصد در کاتد مشاهده می­گردد. نتایج مشخص نمودند اثر پاکسازی NaOH بیشتر از سایر محلولها می­باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Remediation of A Clay Soil Contaminated With Dimethyl Phthalate By ‎Using Electrokinetic Method

نویسندگان [English]

  • Ali Raeesi Estabragh 1
  • Hesam Fathali 2
  • Keramatoallah Rezaee tireh shabankareh 3
  • Hoorfar Abdolhossein 4
1 Geotechnical Engineering, Irrigation and Reclamation Department, University of Tehran.
2 Hydraulic Structures, Irrigation and Reclamation Department, Tehran University,karaj. Iran
3 , Department of Food Industry, Faculty of Engineering and Technology, University of Tehran, Karaj, Iran
4 Department of Irrigation and Development, Faculty of Engineering and Technology, University of Tehran, Karaj, Iran.
چکیده [English]

In this research work, the remediation of a clay soil contaminated with dimethyl phthalate ‎was ‎studied by using electrokinetic method. Contaminated soil was made with the ratio ‎of 0.04 mg/g. ‎Non-ionic (Tween 80) surfactant and solution of 0.1 M NaOH were ‎used as anolyte. A reference ‎test was also considered with distilled water as ‎anolyte and catholyte. pH and EC and volume of ‎flow out fluid were measured ‎during the tests in both electrode reservoirs. At the end of each test ‎the shear ‎strength, pH, EC and degree of remediation of soil was measured at different ‎distance ‎from anode. The removal of contaminated was measure by a GC (Gas ‎Chromatography) apparatus. ‎The results showed that the amount of flow out fluid ‎for NaOH was nearly 20% more than the ‎solution of Tween 80 and distilled water. The ‎results also indicated that the strength of soil for ‎different solution is increased ‎by increasing the distance from anode. The value of it around the ‎cathode for ‎solution of NaOH was 14 kPa that was about 50 and 57% more than the distilled ‎water ‎and Tween 80. It was found that the degree of remediation at cathode is less than ‎anode. The ‎percentage of remediation for Tween 80 solution around the anode and ‎cathode were 53.88 and ‎‎16.5% respectively but for NaOH they changed to 50.82 and ‎‎23.26 near anode and cathode ‎reservoir. It was resulted that the effectiveness of NaOH ‎solution in remediation of soil was more ‎than the other used solutions.

کلیدواژه‌ها [English]

  • Electrokinetic
  • Clay soil
  • Dimethyl phthalate
  • Remediation
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