The Case for Staging Biological Reactors
Historically, there has not been technical guidance for the configuration of biological basins with the exception of a 1930's recommendation to compartmentalize the basin. In the 1960s, the complete mix activated sludge (CMAS) process emerged as a dominant design concept, but in the last 15-20 years, there has been a trend to move away from the complete mix concept in recognition of its association with bulking sludge problems. However, many of the rectangular aeration basins with a length:width ratio less than 5:1 still maintain many of the hydraulic residence time characteristics of a complete mix basin. Many factors can be involved in the presence or absence of bulking organisms, both from the design and operation of the biological system. This paper will trace the history of experience and provide evidence linking a good settling, low SVI sludge to multi-staging of the total biological reactor. Bioselection zones and the significance of the dissolved oxygen content in the initial aerated zones will also be addressed.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
Document Type: Research Article
Publication date: 2007-10-01
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 These proceedings are not peer reviewed.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