Biosolids as Gels: A New Way of Looking at Conditioning and Dewatering
Authors: Dursun, Derya; Dentel, Steven K.
Source: Proceedings of the Water Environment Federation, WEFTEC 2008: Session 61 through Session 70 , pp. 4713-4724(12)
Publisher: Water Environment Federation
Abstract:Fundamental improvements in conditioning and dewatering can be accomplished with an accurate understanding of the biosolids being processed. Historically, the structures of sludges and biosolids have often been likened to systems of rigid pArticles suspended in water. A new insight has been developed recently in which biosolids are characterized as a “gel.” In this work, physical characterizations of activated sludge, digested biosolids, and synthetic gel suspensions are compared and explained using this conceptual model. Physical appearance of the sludges at the micron level, using Scanning Electron Microscopy (SEM), verify this gel-like matrix structure. Characterizations by swelling and deswelling ability, shear resistance, and rheometric behavior were shown to be consistent with this model as well. Even if the matrix structure has embedded pArticles, the gel structure is still the major factor that affects conditioning and dewaterability. Thus, breaking the gel structure that retains water may lead to an improvement in dewaterability.
Document Type: Research article
Publication date: 2008-01-01
- 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 These proceedings are not peer reviewed. WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
- Subscribe to this Title
- Membership Information
- About WEF Proceedings
- WEFTEC Conference Information
- ingentaconnect is not responsible for the content or availability of external websites