WERF Phase 1: Factors affecting conditioning during dewatering: Sludge and Polymer Characteristics
Abstract:A study was performed to investigate the factors which impact polymer demand during conditioning such as biocolloid concentration, polymer characteristics and shear. The central hypothesis of the research was that biocolloids were directly related to polymer demand, and factors affecting biocolloid concentration and their charge neutralization would impact polymer demand. This is the first paper in the two-paper series which examines the role of biocolloids and polymer characteristics on polymer demand. Biocolloids are defined as small particles that are detached from the larger flocs, and are primarily protein and polysaccharide produced by microbes. In addition the role of polymer characteristics was investigated. The results showed a very good linear correlation (r2=0.83) between biocolloid concentration and the optimum polymer dose (OPD) measured for a number of different sludge types. The thermophilic sample had the greatest polymer demand, followed by mesophilic anaerobic, aerobically digested, and activated sludges. The polymer charge density and molecular weight also impacted the OPD. The greater charge density of the polymer resulted in increased polymer demand when the polymer demand is expressed on an equivalent charge basis, while higher molecular weight polymers had lower polymer demand. The results can be applied by practitioners to understand the factors which will affect polymer dosages and ultimately polymer costs.
Document Type: Research Article
Publication date: 2004-01-01
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 These proceedings are not peer reviewed.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