کاربرد روش انعقاد شیمیایی در تصفیه پساب کارخانه بازیافت کاغذ

نویسندگان

1 دانش آموخته کارشناس ارشد مهندسی منابع طبیعی، دانشگاه تربیت مدرس، نور 2- دانشیار گروه محیط زیست، دانشکده منابع طبیعی، دانشگاه تربیت مدرس، نور

2 دانشیار گروه محیط زیست، دانشکده منابع طبیعی، دانشگاه تربیت مدرس، نور

3 استادیار گروه محیط زیست، دانشکده منابع طبیعی، دانشگاه تربیت مدرس، نور

4 دانشجوی دکترای آلودگی محیط زیست، دانشگاه تربیت مدرس، نور

چکیده

پسابهای صنعت بازیافت کاغذ دارای حجم زیاد و آلودگی بسیار بالایی هستند و فرایند تصفیه این پسابها به‌خاطر تعدد آلاینده‌ها و پیچیدگی ساختمان شیمیایی آنها یکی از مشکل‌ترین و پیچیده‌ترین فرایندهاست. در این مطالعه، فشردگی حجم لجن و میزان حذف کدورت و COD پساب به‌وسیله منعقدکننده‌های آلوم و پلی‌آلومینیوم کلراید تحت تأثیر متغیرهای pH اولیه پساب, COD اولیه پساب و غلظت اولیه مواد منعقدکننده بررسی شدند. محدوده تعیین شده pH اولیه پساب 2 تا 12، غلظت آلوم 200 تا 2000 میلی‌گرم در لیتر، غلظت PACl 50 تا 1500 میلی‌گرم در لیتر و COD اولیه پساب 250 تا 2250 میلی‌گرم در لیتر بود. طبق داده‌های حاصل از مطالعات ناپیوسته, میزان فشردگی حجم لجن 193 میلی‌لیتر بر گرم و حداکثر درصد حذف کدورت و COD به‌ترتیب مقادیر 89/90 و 85/16 درصد با استفاده از منعقد کننده‌های آلوم و PACl به‌دست آمدند. مطالعات نشان داد که مواد منعقدکننده آلوم و PACl توانایی بالایی برای حذف آلاینده‌ها از فاضلاب کارخانه‌ها دارند.


کلیدواژه‌ها


عنوان مقاله [English]

Application of Chemical Coagulation Method for Paper-Recycling Wastewater Treatment

نویسندگان [English]

  • Noushin Birjandi 1
  • Habibollah Younesi 2
  • Nader Bahramifar 3
  • Mojtaba Hadavifar 4
1 M.Sc. Student of Natural Resources Eng., Tarbiat Modares University, Noor
2 Assoc. Prof. of Environment, Dept. of Natural Resources, Tarbiat Modares University, Noor
3 Assist. Prof. of Environment, Dept. of Natural Resources, Tarbiat Modares University, Noor
4 Ph.D. Student of Environmental Pollution, Tarbiat Modares University, Noor
چکیده [English]

Paper-recycling wastewaters have high volume and high pollution and its treatment is the most difficult and complicated process because of their colored pollutants and certain rigid chemical structure. In this study, the efficiency of alum in coupled with polyaluminum chloride (PACl) coagulant on the treatment of paper recycling wastewater was investigated. The effects of initial pH, initial COD and coagulation concentration on sludge volume index (SVI), and turbidity and COD removal were studied. Set tested for coagulation process was 2-12 initial pH, 200-2000 mg/l of alum concentration, 50-1500 mg/l of PACl concentration and 250- 2250 mg/l initial COD. According to the data obtained from batch studies, maximum percentage removal of turbidity and COD 89.90% and 85.16% respectively. The SVI of 193 ml/gr was found in this study. This study showed that the alum and PACl coagulants have high ability to remove pollutants from wastewater factory.

کلیدواژه‌ها [English]

  • Paper-Recycling Wastewater
  • Alum
  • PACl
  • Turbidity
  • COD
Martin, E.J., and Johnson, J. H. (1991) Hazardous waste management Van Nostrand Reinhold Pub.,New York Pizzichini, M., Russo, C., and Meo, C.D. (2005) Purification of pulp and paper wastewater, with membrane technology for water reuse in a closed loop Desalination 178 (1-3), 351-359 Rodrigues, A.C., Boroski, M., Shimada, N. S., Garcia, J. C., Nozaki, J., and Hioka, N. (2008) Treatment of paper pulp and paper mill wastewater by coagulation-flocculation followed by heterogeneous photocatalysis J. of Photochemistry and Photobiology A: Chemistry 194 (1), 1-10 Almeida, E., Rosa, M.A., and Duran, N. (2004) Tratamento de efluentes indusriais por processos oxidativos da presence de ozonio Quim Nova 27, 818-824 Tambosi, J.L., Schirmer, W.N., Jose, H.J., and Moreira, R. (2006) Treatment of paper and pulp wastewater and removal of odorous compounds by a fentone- like process at the pilot scale Chem. Technol. Biotechnol 81, 1426-1432 Yilmaz, T., and Basibuyuk, M. (2008) Comparison of the performance of mesophilic and thermophilic anaerobic filters treating paper mill wastewater Bioresource Technology 99, 156-163 Koistinen, J., Tukia, K., Soimasuo, M., Lahtipera, M., and Oikari, A. (1998) Identification of lipophilic discharged from a finish pulp and paper mill Chemosphere 37, 219-235 Ahmad, A.L., Wong, S. S., Teng, T. T., and Zuhairi, A. (2008) Improvement of alum and PACl coagulation by polyacrylamides (PAMs) for the treatment of pulp and paper mill wastewater J. Chemical Engineering 173 (3), 510-517 Wong, S.S., Teng, T. T., Ahmad, A. L., Zuhairi, A., and Najaf pour, G. (2006) Treatment of pulp and paper mill wastewater by polyacrylamide (PAM) in polymer induced flocculation J. of Hazardous Materials 135 (1-3), 378-388 Munkttrick, K.R., Carey, J.H., Van Der, G.J., and Raak, K. (1997) Environmental impact of pulp and paper wastewater: Evidence for a reduction in environmental effects of North American puli mills since Water Sci. Technol. 35, 329-338 Young, S. (2001) Effect of pulp mill chemicals on flocculation in river water Water Sci. Technol. 1, 251-258 Rana, T., Kumar, D., Sharma, S., Rana, M., Rathore, V.S., and Pereira, B.M.J. (2004) Toxic effluents of pulp and paper- mill effluents on male reproductive organs and some systemic parameters in rats Environ. Toxicol. Pharm 18, 1-7 Pala, A. (2002) Color from cotton textile industry wastewater in an activated sludge system with variuos additives Water Research 36, 2920-2925 Ghodbanan, Sh., Chalkesh Amiri, M., and Moayedi Khosroshahi, H. (2001) Investigation of metal coagulants in coagulation-flocculation pollutant of effluent from sulfate papermill 7th National Iranian Chemical Engineering Congress, University of Tehran , 659-664 Ben Mansor, I. (2008) Treatment of effluents from cardboard industry by coagulation- electroflotation J. of Hazardous Materials 153, 1067-1070 APHA., AWWA. (1998) Standard methods for the examination of water and wastewater 20th Ed., American Public Health Association(APHA), American Water Works Association, Water Environment Federation, Washington, DC. Roshani, B., and Seyed Mohamdi, A. (2002) Investigation wastewater treatment of detergent industry by coagulation in labrator J. of Medical University 30, 67-75 Zayas, T., Romero, N., Salgado, L., Meraz, M., and Morales, U. (2007) Applicability of coagulation/flocculation and electrochemical processes to the purification of biologically treated vinasse effluent Separation and Purification Technology 57 (2), 270-276 Teresa, Z., Salgado L., Meraz, M., and Morales, U. (2007) Applicability of coagulation/flocculation and electrochemical processes to the purification of biologically treated vinass effluent Separation and Purification Technology 57, 270-276 Huang, C., (2002) Coagulation approach to water treatment Encyclopedia of surface and colloid science Marcel Dekker Inc., New York Ma, X.J., and Xia, H. L. (2008) Treatment of water-based printing ink wastewater by fenton process combined with coagulation J. of Hazardous Materials 162 (1), 386-390 Wang, J.P., Chen, Y. Z., Geo, X. W., and Yu, H. Q. (2007) Optimization of coagulation-flocculation process for a paper-recycling wastewater treatment using response surface methodology Colloids and Surfaces A: Physicochemical and Engineering Aspects 302 (1-3), 204-210