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Comparative Study of Smbr and Extended Aeration Activated Sludge Processes in the Treatment of High-Strength Wastewaters Publisher



Mohammadi H1 ; Sabzali A2 ; Gholami M3 ; Dehghanifard E3 ; Mirzaei R3
Authors
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Authors Affiliations
  1. 1. Environ. Health Dept., School of Public Health, Zanjan University of Medical Sciences, Zanjan 4515786349, Iran
  2. 2. Department of Environmental Health Engineering, School of Public Health, Isfahan University of Medical Sciences, Iran
  3. 3. Department of Environmental Health Engineering, School of Public Health and Institute of Public Health Research, Tehran University of Medical Sciences, Tehran, P.O. Box: 6446-14155, Iran

Source: Desalination Published:2012


Abstract

This study was conducted to compare the performance of extended aeration activated sludge (EAAS) with submerged membrane bioreactor (SMBR) systems in the treatment of high-strength wastewater under the same condition. The chemical oxygen demand (COD) concentration of the influent wastewater for the EAAS and SMBR systems was adjusted between 500-2700 and 500-5000mg/L, respectively. Results showed that the SMBR system produced a much better quality effluent than EAAS system in terms of COD, biochemical oxygen demand (BOD 5), total suspended solids (TSS) and ammonium. By increasing the COD concentration, the concentration of mixed liquor suspended solids (MLSS) and the removal efficiency of organic matter in the SMBR system were increased regularly; however, the removal efficiency of COD in the EAAS system was irregular. The average BOD 5/COD ratio of effluent in the EAAS and SMBR systems were 0.708±0.18 and 0.537±0.106, respectively. These show that the organic matter in the effluent of the SMBR system was less degradable, and thus, more biological treatment was achieved. Nitrification was completely achieved in the SMBR system, while the EAAS system could not complete the process. © 2011 Elsevier B.V.
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