caa a22 4500 605504032 CHVBK 20210128105158.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s00253-014-6287-1 doi (NATIONALLICENCE)springer-10.1007/s00253-014-6287-1 Impact of salinity on the aerobic metabolism of phosphate-accumulating organisms [Elektronische Daten] [L. Welles, C. Lopez-Vazquez, C. Hooijmans, M. van Loosdrecht, D. Brdjanovic] The use of saline water in urban areas for non-potable purposes to cope with fresh water scarcity, intrusion of saline water, and disposal of industrial saline wastewater into the sewerage lead to elevated salinity levels in wastewaters. Consequently, saline wastewater is generated, which needs to be treated before its discharge into surface water bodies. The objective of this research was to study the effects of salinity on the aerobic metabolism of phosphate-accumulating organisms (PAO), which belong to the microbial populations responsible for enhanced biological phosphorus removal (EBPR) in activated sludge systems. In this study, the short-term impact (hours) of salinity (as NaCl) was assessed on the aerobic metabolism of a PAO culture, enriched in a sequencing batch reactor (SBR). All aerobic PAO metabolic processes were drastically affected by elevated salinity concentrations. The aerobic maintenance energy requirement increased, when the salinity concentration rose up to a threshold concentration of 2% salinity (on a W/V basis as NaCl), while above this concentration, the maintenance energy requirements seemed to decrease. All initial rates were affected by salinity, with the NH4- and PO4-uptake rates being the most sensitive. A salinity increase from 0 to 0.18% caused a 25, 46, and 63% inhibition of the O2, PO4, and NH4-uptake rates. The stoichiometric ratios of the aerobic conversions confirmed that growth was the process with the highest inhibition, followed by poly-P and glycogen formation. The study indicates that shock loads of 0.18% salt, which corresponds to the use or intrusion of about 5% seawater may severely affect the EBPR process already in wastewater treatment plants not exposed regularly to high salinity concentrations. Springer-Verlag Berlin Heidelberg, 2014 Water scarcity nationallicence Saline wastewater nationallicence Enhanced biological phosphorus removal (EBPR) nationallicence Phosphate-accumulating organisms (PAO) nationallicence Welles L. Department of Environmental Engineering and Water Technology, UNESCO-IHE Institute for Water Education, Westvest 7, 2611AX, Delft, The Netherlands aut Lopez-Vazquez C. Department of Environmental Engineering and Water Technology, UNESCO-IHE Institute for Water Education, Westvest 7, 2611AX, Delft, The Netherlands aut Hooijmans C. Department of Environmental Engineering and Water Technology, UNESCO-IHE Institute for Water Education, Westvest 7, 2611AX, Delft, The Netherlands aut van Loosdrecht M. Department of Biotechnology, Delft University of Technology, Julianalaan 67, 2628 BC, Delft, The Netherlands aut Brdjanovic D. Department of Environmental Engineering and Water Technology, UNESCO-IHE Institute for Water Education, Westvest 7, 2611AX, Delft, The Netherlands aut Applied Microbiology and Biotechnology Springer Berlin Heidelberg 99/8(2015-04-01), 3659-3672 0175-7598 99:8<3659 2015 99 253 https://doi.org/10.1007/s00253-014-6287-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00253-014-6287-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Welles L. Department of Environmental Engineering and Water Technology, UNESCO-IHE Institute for Water Education, Westvest 7, 2611AX, Delft, The Netherlands aut NATIONALLICENCE 700 1- Lopez-Vazquez C. Department of Environmental Engineering and Water Technology, UNESCO-IHE Institute for Water Education, Westvest 7, 2611AX, Delft, The Netherlands aut NATIONALLICENCE 700 1- Hooijmans C. Department of Environmental Engineering and Water Technology, UNESCO-IHE Institute for Water Education, Westvest 7, 2611AX, Delft, The Netherlands aut NATIONALLICENCE 700 1- van Loosdrecht M. Department of Biotechnology, Delft University of Technology, Julianalaan 67, 2628 BC, Delft, The Netherlands aut NATIONALLICENCE 700 1- Brdjanovic D. Department of Environmental Engineering and Water Technology, UNESCO-IHE Institute for Water Education, Westvest 7, 2611AX, Delft, The Netherlands aut NATIONALLICENCE 773 0- Applied Microbiology and Biotechnology Springer Berlin Heidelberg 99/8(2015-04-01), 3659-3672 0175-7598 99:8<3659 2015 99 253 SWISSBIB 560480415