Print Email Facebook Twitter Cooperation between Candidatus Competibacter and Candidatus Accumulibacter clade I, in denitrification and phosphate removal processes Title Cooperation between Candidatus Competibacter and Candidatus Accumulibacter clade I, in denitrification and phosphate removal processes Author Rubio Rincon, F.J. (TU Delft BT/Environmental Biotechnology; IHE Delft Institute for Water Education) Lopez-Vazquez, C. M. (IHE Delft Institute for Water Education) Welles, L. (IHE Delft Institute for Water Education) van Loosdrecht, Mark C.M. (TU Delft BT/Environmental Biotechnology) Brdjanovic, Damir (TU Delft BT/Environmental Biotechnology; IHE Delft Institute for Water Education) Date 2017 Abstract Although simultaneous P-removal and nitrate reduction has been observed in laboratory studies as well as full-scale plants, there are contradictory reports on the ability of PAO I to efficiently use nitrate as electron acceptor. Such discrepancy could be due to other microbial groups performing partial denitrification from nitrate to nitrite. The denitrification capacities of two different cultures, a highly enriched PAO I and a PAO I-GAO cultures were assessed through batch activity tests conducted before and after acclimatization to nitrate. Negligible anoxic phosphate uptake coupled with a reduction of nitrate was observed in the highly enriched PAO I culture. On the opposite, the PAO I-GAO culture showed a higher anoxic phosphate uptake activity. Both cultures exhibited good anoxic phosphate uptake activity with nitrite (8.7 ± 0.3 and 9.6 ± 1.8 mgPO4-P/gVSS.h in the PAO I and PAO I-GAO cultures, respectively). These findings suggest that other microbial populations, such as GAOs, were responsible to reduce nitrate to nitrite in this EBPR system, and that PAO I used the nitrite generated for anoxic phosphate uptake. Moreover, the simultaneous denitrification and phosphate removal process using nitrite as electron acceptor may be a more sustainable process as can: i) reduce the carbon consumption, ii) reduce oxygen demand of WWTP, and iii) due to a lower growth yield contribute to a lower sludge production. Subject DGAODPAOEBPRGAOPAO I To reference this document use: http://resolver.tudelft.nl/uuid:bf0113e9-571f-409e-acdc-d20e2e4c8486 DOI https://doi.org/10.1016/j.watres.2017.05.001 ISSN 0043-1354 Source Water Research, 120, 156-164 Part of collection Institutional Repository Document type journal article Rights © 2017 F.J. Rubio Rincon, C. M. Lopez-Vazquez, L. Welles, Mark C.M. van Loosdrecht, Damir Brdjanovic Files PDF 1_s2.0_S0043135417303494_main.pdf 2.36 MB Close viewer /islandora/object/uuid:bf0113e9-571f-409e-acdc-d20e2e4c8486/datastream/OBJ/view