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Influence of hydraulic retention time on heterotrophic biomass in a wastewater moving bed membrane bioreactor treatment plant

Abstract

Wastewater treatment using moving bed membrane bioreactor technology was tested with real urban wastewater at a pilot plant, combining moving bed treatment as a biological process with hybrid biomass (suspended and fixed) and the advantages of a membrane separation system. The evolution of the kinetic constants of the hybrid biomass and organic matter removal were studied in a pilot plant under different operational conditions, by varying hydraulic retention time (HRT), mixed liquor suspended solids (MLSS) and temperature, and considering the attached biomass of the carrier and the dispersed biomass of the flocs to reproduce real treatment conditions. The rates of organic matter removal were 97.73 ± 0.81 % of biochemical oxygen demand (BOD5), 93.44 ± 2.13 % of chemical oxygen demand (COD), 94.41 ± 2.26 % of BOD5 and 87.62 ± 2.47 % of COD using 24.00 ± 0.39 and 10.00 ± 0.07 h of HRT, respectively. The influence of the environmental variables and operational conditions on kinetic constants was studied; it was determined that the most influential variable for the decay coefficient for heterotrophic biomass was HRT (0.34 ± 0.14 and 0.31 ± 0.10 days−1 with 10.00 ± 0.07 and 24.00 ± 0.39 h of HRT, respectively), while for heterotrophic biomass yield, this was temperature (0.61 ± 0.04 and 0.52 ± 0.06 with 10.00 ± 0.07 and 24.00 ± 0.39 h of HRT, respectively). The results show that introducing carriers in an MBR system provides similar results for organic matter removal, but with a lower concentration of MLSS.

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Acknowledgments

This research was supported by the Spanish Ministry of Science and Technology under project reference CTM2009-11929-C02-01 and by the University of Granada through a personal grant to J. Martín-Pascual. This research was also made possible thanks to the participation of Empresa Municipal de Abastecimiento y Saneamiento de Granada (EMASAGRA).

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Correspondence to J. M. Poyatos.

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Martín-Pascual, J., Reboleiro-Rivas, P., López-López, C. et al. Influence of hydraulic retention time on heterotrophic biomass in a wastewater moving bed membrane bioreactor treatment plant. Int. J. Environ. Sci. Technol. 11, 1449–1458 (2014). https://doi.org/10.1007/s13762-013-0329-6

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  • DOI: https://doi.org/10.1007/s13762-013-0329-6

Keywords

  • Moving bed
  • Membrane bioreactor
  • Temperature
  • Hydraulic retention time