Abstract
The biomass characteristics, the process performance, and the microbial community for a sequencing batch reactor (SBR) and a submerged membrane SBR (MSBR) were evaluated. A synthetic wastewater containing only 4-chlorophenol (4CP) was used as the sole source of carbon and energy. Degradation efficiencies of 4CP were higher than 99% for both reactors, and no significant differences on the 4CP degradation rates were observed for the SBR (116.9 ± 0.9 mg 4CP g VSS−1 h−1) as well as for the MSBR (117.3 ± 0.5 mg 4CP g VSS−1 h−1). Despite the similar results obtained for the physicochemical parameters, it was found that the biomass characteristics were different considering the sludge volumetric index, settling velocity, protein content in the mixer liquor, and total suspended solids in the effluent. The settling velocity was three times higher in the SBR than in the MSBR; however, a better quality, considering suspended solids, was observed for the MSBR. The protein concentration in the mixed liquor was higher in the MSBR than in the SBR, generating foaming problems in the MSBR. A similarity analysis was made with the Ochiai–Barkman index. Even though the reactors were inoculated with the same biomass, significant differences in the composition and populations dynamics were observed.




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Acknowledgments
Financial support was provided by Fondo de Investigación del Instituto de Ingeniería of the Universidad Nacional Autónoma de México (Proyectos internos A2) and Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México (Project IN104710). Jaime Perez Trevilla and Gloria Moreno are acknowledged for their technical assistance.
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Moreno-Andrade, I., Buitrón, G. Comparison of the Performance of Membrane and Conventional Sequencing Batch Reactors Degrading 4-Chlorophenol. Water Air Soil Pollut 223, 2083–2091 (2012). https://doi.org/10.1007/s11270-011-1006-3
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DOI: https://doi.org/10.1007/s11270-011-1006-3

