اثر اسید استیک بر کارایی پالایش مزرعه ای خاک آلوده به سرب با فناوری الکتروسینتیک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 عضو هیئت علمی

2 هیات علمی مرکز ملی تحقیقات شوری یزد-فیزک خاک-انتقال املاح آلودگی خاک-آبگریزی-

چکیده

اصلاح الکتروسینتیکی خاک یکی از روش‌های ابتکاری جهت آلودگی‌زدایی از خاک‌های آلوده به فلزات سنگین است. با این حال، استفاده از روش مذکور در شرایط مزرعه‌ای در خاک‌هایی با قدرت جذب بالا برای فلزات سنگین، نیاز به مطالعه بیشتر دارد. در این پژوهش اصلاح خاک لوم که به‌صورت مصنوعی با سرب (Pb) آلوده شده بود، به روش الکتروسینتیک در سه عمق صفر، 15 و 30 سانتی‌متری در شرایط مزرعه‌ای در کرت‌های آزمایشی مورد بررسی قرار گرفت. خاک مورد نظر پس از آلوده شدن توسط محلول نیترات سرب (1 گرم در لیتر)، دارای غلظت بالایی از سرب (5/109، 1/102 و 3/87 میلی‌گرم بر کیلوگرم به‌ترتیب در سه عمق صفر، 15 و 30 سانتی‌متری) بود. آزمایش‌ها با اعمال شیب ولتاژ یک ولت بر سانتی‌متر در دوره زمانی 10 روز در شرایط اشباع در مزرعه‌ای در اطراف شهرستان تبریز در شمال غرب ایران انجام گردید. در این تحقیق اثر نوع محلول‌های الکترولیت (آب مقطر و اسید استیک 005/0 مولار) بر کارایی حذف الکتروسینتیکی Pb بررسی شد. نتایج نشان داد که نوع محلول الکترولیت بر روی کارایی حذف Pb مؤثر می‌باشد. بعد از اعمال جریان الکتریکی به مدت 10 روز، میانگین درصد حذف سرب در تیمار آب مقطر در عمق‌های صفر، 15 و 30 سانتی‌متر به‌ترتیب به 15/18، 05/18 و 85/20 درصد رسید. میانگین مقدار حذف Pb از خاک در تیمار اسید استیک در سه عمق مذکور به‌ترتیب برابر با 0/22، 55/21 و 05/24 درصد بود که نشان‌دهنده افزایش 85/3، 5/3 و 2/3 درصدی کارایی حذف نسبت به تیمار آب مقطر بود. مقدار بالای آهک (% 1/20) در خاک مورد نظر مانع افزایش قابل توجه کارایی حذف در تیمار اسید استیک شد. همچنین بررسی تغییرات pH در طول کرت‌های آزمایشی نشان‌دهنده روند افزایشی pH از آند به سمت کاتد بود. در تیمار اسید استیک کاهش pH بیشتری در سمت آند مشاهده شد.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of Acetic Acid on Field Remediation Efficiency of Lead (Pb) contaminated soil with Electrokinetic Technology

نویسندگان [English]

  • Moslem Servati 1
  • Hossein Beyrami 2
1
2 Assistant prof., National Salinity Research Center, Agricultural Research, Education and Extension Organization, Yazd
چکیده [English]

Electrokinetic soil remediation is one of the innovative methods for decontamination of heavy metals from polluted soils. However, employing that method at field condition in soils with great adsorption capacity for heavy metals, needs to be studied thoroughly. In this research a Loam soil spiked with Lead (Pb) used to investigate electrokinetic remediation at field-scale in three depths (0, 15 and 30 cm) at experimental plots. After contamination with lead nitrate solution (1 g l-1), the soil had large amount of Pb (109.5, 102.1 and 87.3 mg kg−1 in three depths 0, 15 and 30 cm, respectively). All experiments were imposed with a constant voltage gradient of 1 V/cm in 10 days period in saturation condition at a field in Tabriz area, North West of Iran. In this study effect of different electrolytes (distilled water, Acetic acid 0.005 M) on the Pb removal efficiency by electrokinetic remediation were studied. The results suggested that removal efficiencies for Pb were influenced by type of electrolyte solution. After applying electrical current for 10 days, mean metal removal efficiency of Pb in distilled water treatment for three depths (0, 15 and 30) were 18.15%, 18.05% and 20.85% respectively. The mean Pb removal from the soil in acetic acid treatment in three mentioned depths were 22.0, 21.55 and 24.05 %, respectively, which represented 3.85, 3.5 and 3.2 % increasing in removal efficiency compared to the distilled water. High lime content (20.1%) of the examined soil appears hindered the increasing in removal efficiency with acetic acid solution. In addition, the pH changes along the soil plots showed an increasing trend from the anode to the cathode. In acetic acid treatment a greater reduction of pH was observed in the anode side.

کلیدواژه‌ها [English]

  • Decontamination
  • Electrolyte
  • Lime
  • Heavy metals
  • Tabriz plain

مراجع

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  • تاریخ دریافت: 20 اردیبهشت 1396
  • تاریخ بازنگری: 16 اردیبهشت 1398
  • تاریخ پذیرش: 09 آبان 1396

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