Floc Structure and Its Impact on Conditioning, Dewatering and Digestion
Abstract:Recent experiments in our laboratories have focused on evaluation the structure of floc and the role this structure plays in conditioning requirements, dewatering behavior and the changes in sludge properties that occur with digestion. It has been found that colloidal protein in solution, which originates from the biopolymer matrix of floc plays a critical role in conditioning and dewatering. Protein is released from the floc structure as a result of excessive mixing or when monovalent cations increase in proportion to divalent cations. These proteins are directly related to the optimal polymer conditioning dose and to the dewatering rate. For digestion processes, anaerobic and aerobic digestion processes differ markedly in term of their impact on conditioning and dewatering. The deterioration in sludges resulting from anaerobic digestion appears to be due to protein released from iron that undergoes reduction in the anaerobic environment. Aerobic digestion results in protein degradation and release of colloidal polysaccharides. These contribute to conditioner requirements and account for differences between anaerobic and aerobic sludge conditioner selection and results.
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 These proceedings are not peer reviewed.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