The operation of two different reactor configurations (UASB and EGSB), while treating medium and low concentrated wastewater (MCW and LCW, respectively), was studied. The MCW (5 g COD/l) was initially supplied for reactor start up and granule maturation, being subsequently changed to the LCW (0.5 g COD/l), with which led the reactors to an unstable state associated with the deterioration of granule characteristics, in terms of extracellular polymeric substances (EPS) content and composition. The addition of pectin as an exogenous EPS was considered as a way to directly act on granule characteristics and its effect was studied by monitoring the operational parameters as well as by following the EPS content and composition within granules and the dynamics of microbial populations. The effect of adding pectin led to a significant recuperation of the operational performance in both reactors, associated with the increase in Archaea relative abundance, this likely related to the major presence of Methanosaeta-like microorganisms in granules with higher activity and stability.
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Research Article|
July 01 2006
Effect of addition of an exogenous exopolymeric substance in UASB and EGSB reactors Available to Purchase
E. Vivanco;
E. Vivanco
*Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso. Avda. Brasil 2950, Casilla 4059, Valparaíso, Chile
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A. Puñal;
*Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso. Avda. Brasil 2950, Casilla 4059, Valparaíso, Chile
**Now at: Technical Biology, Engler-Bunte-Institute, Karlsruhe University, Engler-Bunte-Ring 1, D-76131 Karlsruhe, Germany
E-mail: [email protected]
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R. Chamy
R. Chamy
*Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso. Avda. Brasil 2950, Casilla 4059, Valparaíso, Chile
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Water Sci Technol (2006) 54 (2): 25–31.
Citation
E. Vivanco, A. Puñal, R. Chamy; Effect of addition of an exogenous exopolymeric substance in UASB and EGSB reactors. Water Sci Technol 1 July 2006; 54 (2): 25–31. doi: https://doi.org/10.2166/wst.2006.482
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