کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8895397 1630322 2018 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Citric Acid-Enhanced Electroremediation of Toxic Metal-Contaminated Dredged Sediments: Effect of Open/Closed Orifice Condition, Electric Potential and Surfactant
ترجمه فارسی عنوان
الکترودهای زیستی پیشرفته اسید سیتریک از رسوبات غرق شده از آلاینده های سمی: اثر شرایط آبشاری باز / بسته، پتانسیل الکتریکی و واکنش های
کلمات کلیدی
پتانسیل الکتریکی، اصلاح الکتروکینتیک، الکترو مهاجرت، جریان الکتریکی اسمزی، نفوذپذیری الکترو اسمزی، پیچیده فلزی سیترات،
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش خاک شناسی
چکیده انگلیسی
Citric acid (CA), a widely used eco-friendly electrolyte, can be employed as an agent for enhancing toxic metal (TM) removal from contaminated dredged sediment using electrokinetic (EK) technology. In this study, dredged harbor sediments co-contaminated by TMs were subjected to enhanced EK treatment using a mixture of chelating agent (CA) and surfactant as an additive in the processing fluids. Several control conditions that may influence the efficiency of TM removal were tested, including open/closed sediment chamber orifices, electric potential gradients (0.5, 1.0, and 1.5 V cm−1), and electrolyte surfactant. Tween 20 (4 mmol L−1) was used as a surfactant within the electrolyte to investigate the extent of TM removal in sediment with high organic matter content. The results showed that an open orifice led to a greater electro-osmotic flow (EOF) with moderate TM removal. In contrast, a closed orifice with a nonionic surfactant electrolyte allowed the highest removal of TMs from the matrix. Moreover, increasing the electric potential gradient led to a higher EOF under the open orifice condition, but no significant increase in TM removal was observed owing to a higher accumulation of TMs in the middle of the matrix, caused by the opposite direction of EOF and electro-migration of metal-citrate complexes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Pedosphere - Volume 28, Issue 1, February 2018, Pages 35-43
نویسندگان
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