Abstract
Wastewater from the milk industry usually undergoes activated sludge ahead of refining treatments, final discharge or reuse. To identify the most effective bioreactor hydraulic regime for the secondary treatment of wastewater resulting from the milk industry in an activated sludge system, two lab-scale activated sludge systems characterized by a different configuration and fluid dynamics (i.e., a compartmentalized activated sludge (CAS) with plug flow regime and a complete mixed activated sludge (AS)) were operated in parallel, inoculated with the same microbial consortium and fed with identical streams of a stimulated dairy wastewater. The effect of three process and operational variables—influent chemical oxygen demand (COD) concentration, sludge recycle ratio (R) and hydraulic retention time (HRT)—on the performance of the two systems were investigated. Experiments were conducted based on a central composite face-centered design (CCFD) and analyzed using response surface methodology (RSM). The region of exploration for treatment of the synthetic wastewater was taken as the area enclosed by the COD in (200, 1,000 mg/l), R (1, 5), and HRT (2, 5 h) boundaries. To evaluate the process, three parameters, COD removal efficiency (E), specific substrate utilization rate (U), and sludge volume index (SVI), were measured and calculated over the course of the experiments as the process responses. The change of the flow regime from complete-mix to plug flow resulted in considerable improvements in the COD removal efficiency of milk wastewater and sludge settling properties. SVI levels for CAS system (30–58 ml/g) were considerably smaller that for the AS system (50–145 ml/g). In addition, the biomass production yield could be reduced by about 10% compared to the AS system. The results indicated that for the wastewater, the design HRT of a CAS reactor could be shortened to 2–4 h.
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References
P. Russell, Milk Ind. Int., 10, 36 (1998).
Woodard and Curran, Industrial Waste Treatment Handbook, 2nd Ed., Elsevier (2006).
C. Burton, Dairy Ind. Int., 12, 21 (1997).
G. Vidal, A. Carvalho, R. Mendez and J.M. Lema, Bioresour. Technol., 74, 231 (2000).
J. Donkin, Int. J. Dairy Tech., 50, 67 (1997).
M. I. Berruga, A. Jaspe and C. San-Jose, Int. Biodeter. Biodeg., 40, 119 (1997).
J. S. Arceivala, Wastewater treatment for pollution control, McGraw-Hill, New Delhi (1998).
J. E. Burgess and J. Quarmby, Biotechnol. Adv., 17, 49 (1999).
Metcalf and Eddy, Wastewater Engineering: Treatment and Reuse, McGraw-Hill, New York (2003).
P. L. J. Grady, G. T. Daigger and H. C. Lim, Biological wastewater treatment, Marcel Dekker, New York (1999).
K.H. Song and K. R. Lee, Korean J. Chem. Eng., 24, 116 (2007).
M. E. Abdulgader, Q. J. Yu, P. Williams and A. A. L. Zinatizadeh, In Proceedings of 1st Conference on Environmental Management, Engineering, Planning and Economics, Greece (2007).
Q. J. Yu, H. Xu, D. Yao and P. Williams, Water Sci. Technol., 11, 189 (2003).
S. Sirianuntapilboon, N. Jeeyachok and R. Larplai, J. Environ. Manage., 76, 177 (2005).
J. M. Garrido, F. Omil, B. Arrojo, R. Mendez and J. M. Lema, Water Sci. Technol., 43, 2498 (2001).
J. Keller, S. Watts, W. Battye-Smith and R. Chong, Water Sci. Technol., 43, 355 (2001).
Zh. Zhou, Zh. Wu, Zh. Wang, Sh. Tang, G. Gu, L. Wang, Y. Wang and Zh. Xin, Korean J. Chem. Eng., 28, 1233 (2011).
A. M. Bandpi and H. Bazari, Iran, J. Environ. Health Sci. Eng., 1, 65 (2004).
E. Casey, B. Glennon and G. Hamer, Biotechnol. Bioeng., 62, 183 (1999).
J.W. Lim, S. L. Ng, S. M. Khor and Ch. E. Seng, Korean J. Chem. Eng., DOI:10.1007/s11814-011-0267-2 (2012).
S. A. Raj and D. V. S. Murthy, J. Environ. Sci. Health, A34, 357 (1999).
T. J. Britz, C. Schalkwyk and Y.-T. Hung, Waste Treatment in the Food Processing Industry, Chapter one, Treatment of Dairy Processing Wastewater, Taylor & Francis, New York (2006).
J. Donkin and J.M. Russell, Water Sci. Tech., 36, 79 (1997).
M. D. Altaf, B. J. Naveena and G. Reddy, Bioresour. Technol., 98, 498 (2007).
X. Y. Shi and H. Q. Yu, Process Biochem., 40, 645 (2005).
J. D. Cui, Korean J. Chem. Eng., 27, 174 (2010).
K. Yang, Y. Yu and S. Hwang, Water Res., 37, 2467 (2003).
N. Aghamohammadi, A. A. Hamidi, M. Hasnain, A. A. L. Zinatizadeh, Bioresour. Technol., 98, 3570 (2007).
M. Hadavifar, A.A. Zinatizadeh, H. Younesi and M. Galehdar, Asia-Pacific J. Chem. Eng., 313 (2009).
A.A. L. Zinatizadeh, A.R. Mohamed, A. Z. Abdullah, M.D. Mashitah, M. Hasnain and G. D. Najafpour, Water Res., 40, 3193 (2006).
M. Ziabari, V. Mottaghitalab and A. Haghi, Korean J. Chem. Eng., 27, 340 (2010).
A. Akhbari, A. A. Zinatizadeh, P. Mohammadi, M. Irandoust and Y. Mansouri, J. Chem. Eng., 168, 269 (2011).
A. Mohseni-Bandpi and H. Bazari, Iranian, J. Env. Health Sci. Eng., 1, 65 (2004).
T.G. Flapper, N. J. Ashbolt and A. T. Lee, From the lab to full scale SBR operation: Treating high strength variable industrial wastewater, Proceedings of the 2nd International Symposium on Sequencing Batch Reactor Technology, July (2000).
T. Wintgens, J. Rosen, T. Melin, C. Brepols, K. Drensla and N. Engelhardt, J. Membr. Sci., 216, 55 (2003).
D. S. Oliveira, A. C. Prinholato, S. M. Ratusznei, J. A. D. Rodriguesa, M. Zaiat and E. Foresti, J. Environ.Manage., 90, 10 (2009).
B. Farizoglu, B. Keskinler, E. Yildiz and A. Nuhoglu, Process Biochem., 39, 2283 (2004).
R. Kuehl, Design of Experiments: Statistical principles of research design and analysis, C. A: Duxbury Press, Pacific Grove (2000).
A. I. Khuri and J. A. Cornell, Response surfaces: design and analyses, Marcel Dekker, New York (1996).
APHA, WPCF, AWWA, Standard Methods for the Examination of Water and Wastewater, 20th Ed., American Public Health Association (APHA), Washington DC (1999).
D. C. Montgomery, Design and analysis of experiments, John Wiley & Sons, USA (1996).
R.L. Mason, R. F. Gunst and J.L. Hess, Statistical Design and Analysis of Experiments, eighth applications to engineering and science, John Wiley & Sons, New York (2003).
B. Hosseini, G. D. Najafpour, M. Sadeghpour and M. Asadi, Chem. Ind., 3, 468 (2008).
S. Chakraborty and H. Veeramani, Process Biochem., 41, 96 (2006).
Octave Levenspiel, ?/Chemical Reaction Engineering, John Wiley & Sons, New York (2003).
Y. Sh. Wong, M. Omar, A.B. Kadir and T. T. Teng, Bioresour. Technol., 21 (2009).
Y. Liu and J.-H. Tay, Biotechnol. Adv., 22, 533 (2004).
Y. Liu, S. Yang, J. Tay, Q. Liu, L. Qin and Y. Li, Enzyme Microb. Technol., 34, 407 (2004).
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Lorestani, A.A.Z., Bashiri, H., Asadi, A. et al. Comparison of different fluid dynamics in activated sludge system for the treatment of a stimulated milk processing wastewater: Process analysis and optimization. Korean J. Chem. Eng. 29, 1352–1361 (2012). https://doi.org/10.1007/s11814-012-0029-9
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DOI: https://doi.org/10.1007/s11814-012-0029-9