نوع مقاله : Research Paper
نویسندگان
1 دانشجوی دکتری مهندسی عمران-آب، دانشکده مهندسی شیمی، دانشگاه آزاد اسلامی واحد قائمشهر، مازندران، ایران.
2 استادیار، گروه شیمی، دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی واحد رودهن، تهران، ایران.
3 دانشیار، گروه تحقیقاتی غشا، پژوهشکده فناوری نانو، دانشگاه صنعتی نوشیروانی بابل، مازندران، ایران.
4 استادیار، گروه شیمی، دانشگاه آزاد اسلامی واحد قائمشهر، مازندران، ایران.
چکیده
زمینه و هدف: با توجه به بالا بودن بار آلایندگی پساب تولیدشده از کارخانه‌های کاغذ و به منظور جلوگیری از آسیب به محیط‌زیست پیرامون، پساب حاصل پیش از ورود به محیط‌زیست نیازمند تصفیه می‌باشد.
مواد و روش‌ها: بعد از نمونه‌گیری از پساب کارخانه چوب و کاغذ در شهرستان بابل و بررسی خواص کمی و کیفی آن، مقادیر بالایی از COD و TSS در آن شناسایی شد. در نتیجه، فرایند انعقاد و لخته‌سازی با استفاده از مواد منعقدکننده پلیمری مانند سولفات‌آهن، کلروفریک، پلی‌آلومینیوم‌کلراید و آلوم و مواد لخته‌ساز و کمک منعقدکننده مانند پلی‌آکریل‌آمید آنیونی و کاتیونی برای حذف مقادیر COD و TSSمورد بررسی قرار گرفت.
یافته‌ها: سولفات‌آهن، کلروفریک، پلی‌آلومینیوم‌کلراید، آلوم در pH بهینه خود به ترتیب منجر به حذف %12، %5/13، %15 و %23 از COD پساب و همچنین %5/45، %47، %49 و %52 از TSS شدند. سپس با بررسی تأثیر غلظت مواد منعقدکننده، آلوم با غلظت بهینه g/l 1 موجب حذف %7/23 COD و %4/56 TSS شد. همچنین تأثیر استفاده از کمک منعقد کننده‌های پلیمری آنیونی و کاتیونی مورد بررسی قرار گرفت. با توجه به نتایج حاصل، کمک منعقدکننده آنیونی با غلظت g/l 004 /0 به همراه غلظت بهینه آلوم سبب حذف %6/48 COD و %6/69 TSS شد.
نتیجه‌گیرى: بر اساس نتایج بدست آمده، می‌توان از فرایند انعقاد و ته نشینی به منظور تصفیه پساب کارخانه کاغذسازی استفاده کرد. همچنین استفاده از ماده منعقدکننده آلوم و کمک منعقدکننده آنیونی به صورت همزمان سبب افزایش بازدهی فرایند انعقاد و لخته‌سازی در حذف آلاینده‌های موجود در پساب کارخانه کاغذسازی می‌شود.
کلیدواژه‌ها
عنوان مقاله [English]
Evaluation of the performance of polymeric coagulants and flocculants on the characteristics of paper mill effluent
نویسندگان [English]
- Ali Reza Seifi 1
- Hasan Ahmadi 2
- Magid Peyrovi 3
- Mehri Esfahanian 4
1 1. Ph.D Student, Department of Chemical Engineering, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran.
2 2. Assistant Professor, Scientific Member of Engineering and Technical Department, Islamic Azad University, Roudehen Branch, Tehran, Iran.
3 3. Associate Professor, Membrane Research Group, Nanotechnology Institute, Babol Noshirvani University of Technology, Shariati Ave., Babol, Iran.
4 Assistant Professor, Chemistry group, Islamic Azad University, Qaemshahr, Iran.
چکیده [English]
Background and Aim: Due to the high pollutant load of paper mill effluent and in order to decrease contaminants, effluent should be treated before being discharged into the environment.
Materials and Methods: After collecting samples of paper mill effluent in Babol city, high levels of COD and TSS were found. Therefore, polymeric coagulants such as iron sulfate, ferric chloride, polyaluminum chloride, and alum were employed, as well as anionic and cationic polyacrylamide flocculants.
Results: Ferrous sulfate, ferric chloride, aluminum polychloride and alum at their optimum pH removed 12%, 13.5%, 15%, and 23% of effluent COD, respectively, as well as 45.5%, 47%, 49% and 52% of TSS. Then, by examining the coagulants concentration effect, alum with an optimal concentration of 1 g/l removed 23.7% COD and 56.4% TSS. Additionally, the effects of anionic and cationic polymeric coagulants were studied. According to the results, using an anionic coagulant at a concentration of 0.004 g / l in combination with the optimal amount of alum resulted in the elimination of 48.6 % COD and 69.6 % TSS.
Conclusion: Based on the results, the coagulation and sedimentation methods can be utilized to treat the effluent of paper mills. Furthermore, using an alum coagulant and an anionic coagulant at the same time improves the efficiency of the coagulation and flocculation processes in removing pollutants from paper mill effluent.
کلیدواژه‌ها [English]
- Keywords: Chemical treatment
- Coagulation and flocculation
- Polymeric materials
- COD
- TSS
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