Physico-Chemical and Biological Treatment of Olive Mill Wastewater by Rotating Biological Contactor (RBC) Reactors

Document Type : Research Article

Authors

BBRC, Department of Chemical and Petroleum Engineering, Sharif University of Technology, P.O. Box 11365-6891 Tehran, I.R. IRAN

Abstract

The removal performance of total poly phenols and orthodiphenols (o-diphenols) content in olive mill waste (OMW) was investigated with a three stages cross flow laboratory scale rotating biological contactor (RBC) in the present study. Due to high COD and other pollutant in the original OMW, physico-chemical treatment was effected for COD and other pollutant reduction prior to biological treatment of OMW by the RBC system. Inoculation of RBC was effected by sludge from olive oil factory. In biological treatment, effect of operating parameters such as hydraulic loading (HL) and influent COD were examined. The study of the  physico-chemical treatment before biological treatment of OMW showed,  that about 9.1% of total poly phenols, 3.2% of o-diphenols and 12% of COD were removed by physical treatment. The effect of chemical treatment by different coagulants, alum, bentonite and zeolite at different pH and concentrations showed that bentonite at pH 6.5 and 15g/l resulted in the best removal efficiency of 20% for poly phenols and o-diphenols. The experimental results in RBC system show that at low HL, significant removal efficiency was observed for poly phenols and o-diphenols, at the first stage, but with increasing HL, other stages took part in removal efficiency. Also, decreasing COD from 5000 to 2500 at different HL caused an increase in poly phenols and o-diphenols  removal efficiency.

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[1] Borja,  R., Garrido,  S. E., Martinez,  L. Ramos-Cormenzana, A., Kinetic study of anaerobic digestion of olive mill wastewater previously fermented with Aspergillus, Process Biochemistry, 28, 397 (1993).
[2] Martin, A. Borja, R. Garcia, I. and Fiestas, J. A., Kinetics of methane production from olive mill wastewater, Process Biochemistry, 26, 101 (1991).
[3] Ragazzi, E. and Veronesse, G., Recherche sulle fenolissi-dasie sul contenuto in o-difenoli delle olive, Ann.Chim., 57, 1456 (1967).
[4] Sorlini, C., Andreoni, V., Ferrari, A. and Ranalli, G., The influence of some phenolic acids present in oil mill waters on microbic groups for the methano-genesis, Proceedings of International Symposium on Olive by Products Valorizatiomn, Sevilla, Spain  pp. 81-88 (1986).
[5] Boari, G., Brunetti, A. Passion, R. and Rozzi, A., Anaerobic digestion of olive mill wastewaters, Agricultural Wastes, 10, 161 (1984).
[6] Borja,  R., Martin,  A., Maestro,  R., Alba, J. and Fiestas, J. A., Enhancement of the anaerobic digestion of olive mill wastewater by removal of phenolic inhibitors, Process Biochemistry, 27, 231 (1992).
[7] Beccari, M., Majone, M., Riccardi, C., Savarese, F. and Torrisi, L., Integrated treatment of olive oil mill effluent: effect of chemical and physical pretreatment on anaerobic treatability, Wat. Sci.Tech., 40, 347 (1999).
[8] Box, J.D., Investigation of the folin-ciocalteau phenol reagent for the determination of polyphenolic substances in natural waters, Water Res., 17, 511 (1983).
[9] Palma, L.D., Merli, C., Paris, M. and Petrucci, E., A steady state model for evaluation of disc rotational speed influence on RBC kinetics: model presentation, Biosource Technol., 86, 193 (2003).
[10] Alemzadeh, I. and Vossoughi, M., Biodegradation of toluene by an attached biofilm in a rotating biological contactor, Process Biochem., 36, 707 (2001).
[11] Alemzadeh, I., Vossoughi, F. and Houshmandi, M., Phenol biodegradation by rotating biological contactor, Biochem. Eng.,11, 19 (2002).
[12] Brar, S. K. and  Gupta, S. K., Biodegradation  of trichloroethylene in a rotating biological contactor, Water Res., 34, 4207 (2000).
[13] Torkian, A., Alinejad, K. and Hashemian, S.J., Post-treatment of upflow anaerobic sludge blanket-treated industrial wastewater by rotating biological contactor, Water Env. Res., 75, 232 (2003). Neu, K.E., Achievement of biological nutrient removal in full-scale rotating biological contactor wastewater treatment plant, Water Sci. Tech., 26, 1115 (1992).
[14] Neu,  K. E., Achievement  of  biological  nutrient removal in full-scale rotating biological contactor wastewater treatment plant, Water Sci. Tech., 26, 1115 (1992).
[15] Su, J. L. and Ouyang, C. F., Advanced biological enhanced nutrient removal  processes by the addition of rotating biological contactor, Wat. Sci. Tech., 35 153 (1997).
[16] Gupta, A.B. and Gupta, S.K., Simultaneous carbon and nitrogen removal from high strength domestic wastewater in an aerobic RBC biofilm, Water Res., 35, 1714 (2000).
[17] Raper, W.G.C.  and Green, j.M.,  Simple process for nutrient removal from food processing effluent, Water Sci. Tech., 43, 123 (2001).
[18] Najafpour, G. D., Naidu, P. N. and  Kamaruddin, A.H., Rotating biological contactor for biological treatment of poultry processing plant wastewater using Saccharomyces cerevisiae, AJChE., 2, 1 (2002).
[19] APHA Standard methods for the examination of water and wastewater, 20th Ed., American Public Health Association, Washington D.C. (1998).