تصفیه آب آلوده به MTBE با استفاده از فرآیند جذب توسط کربن فعال دانه‌ای
محورهای موضوعی : مقالات برگرفته از پایان نامه
نادر مختارانی
1
(استادیار دانشکده عمران و محیط زیست؛ دانشگاه تربیت مدرس)
الهام شفیعی
2
(دانش آموخته کارشناسی ارشد مهندسی محیط زیست دانشکده عمران و محیط زیست؛ دانشگاه تربیت مدرس)
کلید واژه: جذب سطحی, ایزوترم, MTBE, کربن فعال دانه‌ای,
چکیده مقاله :
امروزه، تولید و استفاده از مواد شیمیایی در صنایع مختلف، آلودگی منابع زیست‌محیطی را به‌همراه داشته است. یکی از ترکیباتی که می‌تواند باعث آلودگی گسترده‌ی منابع طبیعی گردد، متیل‌ترشیو‌بوتیل‌اتر (MTBE) می‌باشد. این ترکیب آلی که در صنایع پتروشیمی تولید می‌شود؛ در بنزین کشور‌های مختلف جهان از جمله ایران جایگزین تترا‌اتیل‌سرب شده است. با-توجه به اثبات اثرات سوء MTBE بر محیط زیست و سلامت بشر، پاکسازی منابع آلوده به آن دارای اهمیت فوق‌العاده‌ای می-باشد. در این مقاله پالایش آب‌های آلوده به MTBE با استفاده از فرایند جذب سطحی بر کربن فعال دانه‌ای مورد بررسی قرار گرفته است. نتایج بررسی‌ها نشان می‌دهد که ظرفیت جذب کربن فعال تا حد زیادی تابع pH و زمان تماس می‌باشد. بر‌این-اساس بیشینه‌ی راندمان حذف COD در pH معادل 8 و پس از 45 دقیقه به میزان 62 درصد حاصل گردید. در ادامه مطابقت داده‌های تجربی فرایند جذب با ایزوترم‌های فرندلیچ و لانگمایر بررسی شد. بر‌اساس نتایج حاصل، ضریب همبستگی ایزوترم‌های جذب فرندلیچ و لانگمایر به ترتیب برابر 846/0 و 922/0 حاصل گردید که نشان‌دهنده‌ی تطابق بیشتر فرایند مورد نظر با ایزوترم لانگمایر می‌باشد. همچنین طبق نتایج، حداکثر ظرفیت جذب برای جاذب مورد مطالعه در حدود 67 میلی‌گرم COD به‌ازای هر گرم کربن فعال دانه‌ای برآورد گردید.
Nowadays, Producing and using chemical compounds in different industrials has caused environmental pollution. One of these compounds that can bring a widespread pollution in natural resources is Methyl Tert-Butyl Ether (MTBE). This organic compound that is produced in petrochemical industries is used as a substitute to produce lead free gasoline in all over the world. Human exposure to MTBE may cause dizziness, coughing, fever, headaches, vomiting, muscular aches, sleepiness and skin and eye irritation. Concerning the destructive consequences of MTBE on the environment, and human health, clearing polluted resources are vital. The main objective of this study is dedicated to treat MTBE-contaminated waters through adsorption process in the presence of granular activated carbon (GAC). In this study, the effect of pH as well as exposure time on the removal of MTBE from aqueous solution have been examined and finally the efficacies of the process is assessed in terms of organic compounds removal and GAC reusability. According to the results, the adsorption capacity of used activated carbon depends considerably on the PH and reaction time. In this study, after 45 minutes of reaction time at PH of 8 the maximum COD removal efficiency of 62% was achieved. In this research both the Langmuir and Freundlich isotherm model best represented the MTBE adsorption behavior of GAC, having R2 of 92.2% and 84.6%, respectively. Moreover, maximum capacity of adsorption, in optimized condition, was estimated to be 67 mg of COD per each gr of GAC.
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