Skip to main content

Impact of Substrate Feed Patterns on Solids Reduction by the Cannibal™ Process

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

A laboratory study of a biological solids reduction process, the Cannibal™ process, that used a sidestream anaerobic reactor was undertaken to determine why variations in solids reduction occur in field installations. Two issues were thought to be improtant, the iron concentration in the feed and the activated sludge process configuration. Based on field observations, it appeared that processes that had a single stage reactor and a high sludge age would frequently not provide a low organic solids yield. Iron oxidation/reduction cycling was thought to influence the bioavailability of organic matter in activated sludge flocs. Laboratory sequencing batch reactors were operated—one of which was operated as a conventional activated slduge system and the others included a sidestream anaerobic reactor (Cannibal system). Initially, the iron content in the feed was varied. Later, the feeding cycles were varied. The “fast feed” system used a 5 minute feed period and the “slow feed” had a 4 hour feed period. The objective was to mimic a plug flow system with fast feed and a complete mix system with slow feed. These systems may also be considered to be high substrate pressure (fast feed) and low substrate pressure (slow feed). It was found that the Cannibal process operated as a fast feed system generated up to 80% less solids than the conventional activated sludge system without any negative effect on the effluent quality or the settling characteristics of the activated sludge. For the system operated under low substrate pressure (slow feed), solids production was lower than the conventional activated sludge system but remained higher than for the fast feed system.
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: Cannibal™ process; activated sludge; anaerobic side–stream reactor; combined aerobic–anaerobic processes; iron; yield

Document Type: Research Article

Publication date: 2011-01-01

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
X
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