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Received April 8, 2014
Accepted December 8, 2014
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Process modeling and optimization of biological removal of carbon, nitrogen and phosphorus from hospital wastewater in a continuous feeding & intermittent discharge (CFID) bioreactor
Meghdad Pirsaheb1†
Mitra Mohamadi2
Amir Mohammad Mansouri1 3†
Ali Akbar Lorestani Zinatizadeh4
Sethupathi Sumathi5
Kiomars Sharafi6 7
1Research Center for Environmental Determination of Health (RCEDH), Kermanshah University of Medical Sciences, Kermanshah, Iran 2Student Research Committee, Kermanshah University of Medical Science, Kermanshah, Iran 3Department of Analytical Chemistry, Faculty of Chemistry, Razi University, Kermanshah, Iran 4Water and Wastewater Research Center (WWRC), Department of Applied Chemistry, Faculty of Chemistry, Razi University, Kermanshah, Iran 5Department of Environmental Engineering, Faculty of Engineering and Green Technology, UniversitiTunku Abdul Rahman, Kampar, Perak, Malaysia 6Department of Environmental Health Engineering, School of Public Health, Kermanshah University of Medical Sciences, Kermanshah, Iran 7Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Kermanshah, Iran
Korean Journal of Chemical Engineering, July 2015, 32(7), 1340-1353(14), 10.1007/s11814-014-0365-z
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Abstract
We evaluated the feasibility and treatment performance of a continuous feeding and intermittent discharge (CFID) bioreactor treating real hospital wastewater with the emphasis on simultaneous carbon, nitrogen and phosphorus (CNP) removal. The experiments were based on a central composite design (CCD) and analyzed by response surface methodology (RSM). To analyze the process, three significant variables, aeration time (2-4 h), mixing time without aeration (30-90 min) and MLSS concentration (2,000-6,000mg/l), were studied. Results show that an increase in aeration time increased the nitrogen and phosphorous removal efficiency. However, when the aeration time was more than 3 h, the efficiency of phosphorous removal was decreased due to insufficient acidification. A similar scenario was observed when mixing time was increased for phosphorus and nitrogen removal efficiency. MLSS had a positive effect on all the responses. Under optimal conditions, the concentrations of quality parameter in the influent in average were recorded as 586 mg COD/l, 296mg BOD5/l, 97mgTN/l and 16.47mg TP/l, which yields the following removal efficiencies, 95.6%, 98.3%, 88.0% and 92.0%, respectively.
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Mansouri AM, Zinatizadeh AA, Irandoust M, Akhbari A, Korean J. Chem. Eng., 31(1), 88 (2014)
Abdulgader M, Yu QJ, Zinatizadeh AA, Williams P, Asia-Pac. J. Chem. Eng., 4, 698 (2009)
Zinatizadeh AAL, Mansouri Y, Akhbari A, Pashaei S, Chem. Ind. Chem. Eng. Q., 17(4), 485 (2011)
Kargi F, Konya I, J. Environ. Manag., 84, 20 (2007)
Meng F, Chae SR, Drews A, Kraume M, Shin HS, Yang F, Water Res., 43, 1489 (2009)
Fu Z, Yang F, An Y, Xue Y, Biochem. Eng. J., 43, 191 (2009)
Pehlivanoglu-Mantas E, Sedlak DL, Crit. Rev. Environ. Sci. Technol., 36, 261 (2006)
Choi C, Lee J, Lee K, Kim M, Bioresour. Technol., 99(13), 5397 (2008)
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