Skip to main content

Biological Solids Reduction in Activated Sludge with an Anaerobic Side-Stream Reactor

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

To investigate the mechanism of excess sludge reduction in an activated sludge process (ASP) that incorporates an anaerobic side-stream bioreactor (ASSR), four systems were operated in the laboratory: (a) ASP+ASSR (R1); (b) ASP+aerobic digester (R2); (c) ASP+anaerobic digester (R3); and (d) ASP without solids wastage (R4). The overall sludge yield of ASP+ASSR (R1) was the lowest among four systems without showing any negative impacts on effluent quality, The net sludge yield of R1 was 24-57% and 4-49% less than the three other systems in phase I and phase II, respectively. Accounting of biomass in R1 reveals that ASSR works like a conventional anaerobic digester but leads to additional sludge reduction in the main aeration basin. The results from batch digestion tests indicated that both anaerobically and aerobically digestible sludge degrade in R1. The extracellular polymeric substances (EPS) extraction results showed that release and degradation of base-extractable EPS, thought to be iron and/or aluminum bound floc materials, accounts for lower sludge yield in ASP+ASSR. The bacterial fingerprinting data showed that there was high similarity of microbial composition between the anaerobic side-stream reactor and the anaerobic digester; however, there were unique microbial cells in the side-stream tank reactor as well, indicating that some microbial cells were enriched in anaerobic side-stream bioreactor due to the continuous sludge recirculation via minimal sludge wasting.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

Keywords: Activated sludge; EPS; aerobic digestion; anaerobic digestion; excess sludge reduction; side-stream reactor; yield

Document Type: Research Article

Publication date: 2010-01-01

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 These proceedings are not peer reviewed.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
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more