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نوع مقاله : مقالات پژوهشی

نویسندگان

1 استادیار، گروه محیط زیست، دانشکده کشاورزی و منابع طبیعی، مرکز تحقیقات پسماند و پساب، دانشگاه آزاد اسلامی، خوراسگان (اصفهان)، ایران.

2 دانشجوی دکتری، گروه محیط زیست، دانشکده کشاورزی و منابع طبیعی، مرکز تحقیقات پسماند و پساب، دانشگاه آزاد اسلامی، خوراسگان (اصفهان)، ایران.

3 کارشناس، گروه محیط زیست، دانشکده کشاورزی و منابع طبیعی، مرکز تحقیقات پسماند و پساب، دانشگاه آزاد اسلامی، خوراسگان (اصفهان)، ایران.

چکیده

زمینه و هدف: آلوده شدن آب به ترکیبات نفتی در ایران از بدو استخراج نفت از سده گذشته ایجاد شده است و انباشت تدریجی آنها در محیط سلامتی منابع آب کشور را تهدید می‌کند، بنابراین گسترش فناوری­های جدید برای حذف و پاک‌سازی آلودگی­های نفتی ضروری است. روش­های مختلفی برای پاک‌سازی آلودگی­های نفتی و مشتقات آن وجود دارد. در این پژوهش، از جاذب پسماند پشم سنگ به عنوان جاذب ارزان قیمت برای حذف آلودگی نفتی (نفت سفید) از پساب استفاده شد.
مواد و روش‌ها: در ابتدا با استفاده از آنالیز­­ XRF و XRD ترکیب شیمیایی تعیین شد، سپس آزمایشات جذب به صورت ناپیوسته با استفاده از محلول­های آزمایشگاهی حاوی نفت انجام گرفت و شرایط بهینه جذب با تغییر فاکتورهای مؤثر بر جذب که شامل pH، غلظت اولیه آلوده کننده، زمان تماس و مقدار جاذب بر میزان جذب در سطوح مختلف بود، مورد بررسی قرار گرفت و در نهایت استفاده از جاذب برای پساب آزمایشگاهی مورد مطالعه قرار گرفت.
یافته­ ها: کارایی جاذب در زمان تعادل برای جذب نفت با استفاده از جاذب پسماند پشم سنگ در min 15 دقیقه با اختلاف معنی‌داری بیشتر از دیگر زمان تماس­ها بود (میزان 76/01 درصد جذب؛ 0/05>p) و کمترین مقدار آن با اختلاف معنی‌داری در min 3 مشاهده شد (میزان 63/82 درصد جذب؛ 0/05>p). بیشترین میزان جذب پسماند پشم سنگ در 3=pH مشاهده شد که اختلاف معنی‌داری با دیگر pH‌ها داشت (میزان 70/59 درصد جذب؛ 0/05>p) و کمترین درصد جذب با اختلافی معنی‌دار در 9=pH مشاهده شد (میزان 57/69 درصد جذب؛ 0/05>p). تأثیر مقادیر جاذب پسماند پشم سنگ در 0/5 و g/L 1 با یکدیگر اختلاف معنی­داری با یکدیگر نداشتند، اما با اختلاف معنی‌داری بیشتر از دیگر مقدار جاذب­ها بودند (به ترتیب میزان 76/80 و 75/30 درصد جذب؛ 0/05>p) و کمترین درصد جذب با اختلاف معنی‌داری نسبت به سایر مقادیر در g/L 0/25 مشاهده شد (میزان 67/78 درصد؛ 0/05>p). برازش هم­دماهای جذب سطحی نشان داد که جذب نفت توسط پسماند پشم سنگ با مدل لانگمویر مطابقت دارد (میزان 0/99=R2 می­باشد).
نتیجه­ گیری: جاذب پسماند پشم سنگ، کارایی بالای در جذب نفت از پساب دارد و می­تواند در رفع آلودگی نفتی (نفت سفید) مورد استفاده قرار گیرد.

کلیدواژه‌ها

عنوان مقاله [English]

Study on the efficacy of mineral wool wastes in adsorption of waterborne oil contamination (Kerosene)

نویسندگان [English]

  • mohammad hadi abolhasani 1
  • niloofar pirestani 2
  • hajar amini 3

1 Assistant Professor, Departmant of environmental science, waste and wastewater research center, Islamic azad university, khorasgan(Isfehan), Iran.

2 PHD, Departmant of environmental science, waste and wastewater research center, Islamic azad university, khorasgan(Isfehan), Iran.

3 BS, Departmant of environmental science, waste and wastewater research center, Islamic azad university, khorasgan(Isfehan), Iran.

چکیده [English]

Background and aim: water oil contamination has occurred in Iran since the previous century and environmental oil accumulation threatens the country water resources’ health. There are several methods to remove oil and its derivatives contamination. In the present study, mineral wool waste was used as low price adsorbent for wastewater oil contamination (kerosene) removal.
Materials and methods: first, XRF and XRD analyses were used to determine chemical composition. Then, adsorption tests were conducted discontinuously using laboratory solutions containing oil to determine optimum adsorption conditions by adjustment of effective factors such as pH, initial concentration, exposure time and adsorbent concentration. Thereafter, application of adsorbent for laboratory wastewater was studied.
Results: after 15 min exposure, the adsorbent (mineral wool wastes) efficacy was significantly higher than the other times (76.01 % adsorption; P<0.05); whereas, the lowest efficacy was observed after 3 min (63.82 %; P<0.05). Among the tested pH, the highest and lowest adsorption were observed at pH = 3 (70.59 %; P<0.05) and 9 (57.69 %; P<0.05), respectively. There was no significant difference in adsorption between the adsorbent concentrations of 0.5 and 1 g (76.80 and 75.30 %); however, both were significantly (P<0.05) higher than the other concentrations. the lowest adsorption was observed at the concentration of 0.25 g adsorbent (67.78 %). Isotherm fitting of surface adsorption showed that oil adsorption by mineral wool wastes follows Langmuir model (R2=0.99).
Conclusion: it is concluded that mineral wool waste has high efficiency to adsorb oil from wastewater and could be used for oil contamination removal.

کلیدواژه‌ها [English]

  • Rock wool's waste
  • oil pollution
  • laboratory wastewater
  • effective factors on absorption
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