THE EFFECTS OF PROPIONIC VERSUS ACETIC ACID CONTENT OF DOMESTIC SEWAGE ON ENHANCED BIOLOGICAL PHOSPHORUS REMOVAL
Abstract:Enhanced Biological Phosphorus Removal was found to be superior for a Sequencing Batch Reactor (SBR) treating septic domestic wastewater with a propionic/acetic acid ratio of 2.12 (Propionic SBR) compared to a parallel and identical system with a propionic/acetic acid ratio of 0.145 (Acetic SBR). The Propionic SBR biomass removed 10.65 mg phosphorus (P)/gVSS (s=0.68) compared to 8.20 mgP/gVSS (s=0.93) for the Acetic SBR. However the maximum Propionic SBR PHA content was 49.3 mgPHA/gVSS with a 3HV/3HB ratio of 2.69. This was much lower than the Acetic SBR PHA content of 76.4 mgPHA/gVSS with a 3HV/3HB ratio of 0.449. The stoichiometric relationship between PHA and P was significantly different for the two populations studied. This was in spite of the fact that acetic acid gave superior results relative to propionic acid in batch experiments using Propionic SBR biomass. It is probable that while propionic acid was less efficient for EBPR than acetic acid in pure biochemical terms, it was even less efficient for organisms uninvolved in EBPR, giving it a stronger selective pressure favoring EBPR than acetic acid. The selective pressure of the VFAs was more significant than biochemical processing.
Document Type: Research Article
Publication date: 2002-01-01
More about this publication?
- Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.
WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
- Subscribe to this Title
- Membership Information
- About WEF Proceedings
- WEFTEC Conference Information
- Learn about the many other WEF member benefits and join today
- Ingenta Connect is not responsible for the content or availability of external websites