Abstract
This study was on the technical and biological characteristics of a partial-SHARON submerged-filter bioreactor of 3 L. The main focus was the influence of the hydraulic retention time (HRT) on biofilms. For this purpose, we used molecular tools based on the partial 16S rRNA genes. The results showed that the HRT may affect the nitrification processes of a bioreactor using synthetic wastewater containing 600 mg/L of ammonia. It was found that an HRT of 0.5 day transformed 100 % of the ammonium into nitrite. However, when the HRT was decreased to 0.4 day, there was a significant reduction (35 %) in the quantity of ammonia transformed, which confirmed the complexity of the system operation. Moreover, a PCR-TGGE approach highlighted the differences observed. The results obtained showed that an HRT of 0.5 day reduced bacterial biodiversity in the biofilms, which were mainly formed by Nitrosomonas and Diaphorobacter. In contrast, an HRT of 0.4 day facilitated the formation of heterogeneous biofilms formed by nitrifying bacteria, such as Nitrosomonas sp., Nitrosospira sp., and Nitrosovibrio sp.).
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Acknowledgments
This research was funded by the Department of Innovation, Science and Enterprise of the Regional Government of Andalusia, Spain (P09-RNM-5412). We would also like to thank the MITA group, the Instituto de Parasitología y Biología Molecular López Neyra (CSIC, Granada, Spain) and the Centro de Instrumentación Científica (CIC, Granada, Spain) for their valuable cooperation.
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González-Martínez, A., Calderón, K., Albuquerque, A. et al. Biological and technical study of a partial-SHARON reactor at laboratory scale: effect of hydraulic retention time. Bioprocess Biosyst Eng 36, 173–184 (2013). https://doi.org/10.1007/s00449-012-0772-7
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DOI: https://doi.org/10.1007/s00449-012-0772-7