Effects of anaerobic HRT and VFA loading on the kinetics and stoichiometry of enhanced biological phosphorus removal
© 2021 Water Environment Federation.
| Veröffentlicht in: | Water environment research : a research publication of the Water Environment Federation. - 1998. - 93(2021), 9 vom: 27. Sept., Seite 1608-1618 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2021
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| Zugriff auf das übergeordnete Werk: | Water environment research : a research publication of the Water Environment Federation |
| Schlagworte: | Journal Article activated sludge biological treatment resource recovery wastewater treatment Fatty Acids, Volatile Sewage Phosphorus 27YLU75U4W |
| Zusammenfassung: | © 2021 Water Environment Federation. Enhanced biological phosphorus removal (EBPR) can recover significant quantities of wastewater phosphorus. However, this resource recovery process realizes limited use largely due to process stability concerns. The research evaluated the effects of anaerobic HRT (τAN ) and VFA concentration-critical operational parameters that can be externally controlled-on EBPR performance. Evaluated alone, τAN (1-4 h) exhibited no statistical effect on effluent phosphorus. However, PHA increased with VFA loading and biomass accumulated more phosphorus. Regarding resiliency, under increasing VFA loads PAOs hydrolyzed more phosphorus to uptake/catabolize VFAs; moreover, PHA synthesis normalized to VFA loading increased with τAN , suggesting fermentation. Kinetically, PAOs exhibited a Monod-like relationships for qPHAAN and qVFAAN as a function of anaerobic P release; additionally, qPAE exhibited a Monod-like relationship with end-anaerobic PHA concentration. A culminating analysis affirmed the relationship between enhanced aerobic P uptake, and net P removal, with a parameter (phosphorus removal propensity factor) that combines influent VFA concentration with τAN . PRACTITIONER POINTS: Evaluated alone τAN exhibits no statistical effect on effluent phosphorus in an EBPR configuration. Increased PHA synthesis, associated with increased VFAs and/or extended τAN, enhances aerobic phosphorus removal. PHA synthesis normalized to VFA loading increased with τAN , suggesting fermentation in the EBPR anaerobic zone. Aerobic phosphorus uptake increases linearly with anaerobic phosphorus release, with the slope exceeding unity. Increased VFAs can be substituted for shorter anaerobic HRTs, and vice versa, to enhance EBPR performance |
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| Beschreibung: | Date Completed 08.09.2021 Date Revised 08.09.2021 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1554-7531 |
| DOI: | 10.1002/wer.1544 |