Authors: Novak, John T.; Murthy, Sudhir N.

Source: Proceedings of the Water Environment Federation, WEF/AWWA/CWEA Joint Residuals and Biosolids Management 2001 , pp. 1204-1217(14)

Publisher: Water Environment Federation

Abstract:

In this study, the basic structure ofactivated sludge flocs is described and the changes in settling and dewatering caused by changes in wastewater characteristics, solids handling procedures and digestion will be detailed. The role of biopolymer and cations, especially iron, in determining floc structure will be explained. This information will explain why sludges differ and how aerobic and anaerobic digestion can alter sludge properties and increase the demand for conditioning chemicals. It will be shown that the release of biopolymer into solution leads to increased polymer conditioning demand. The amount of conditioning chemical required is directly related to the solution colloidal protein content. Anaerobic digestion results the reduction of iron in flocs and the release of large quantities of protein into solution and as a result, conditioning demand is high. Conditioning using iron results in coagulation of solution proteins and produces stronger and less compressible flocs that have different dewatering properties than polymer conditioned sludges.

Document Type: Research article

DOI: http://dx.doi.org/10.2175/193864701784992994

Publication date: 2001-01-01

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 These proceedings are not peer reviewed.
  
  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

Related content

• In this: publication
• By this: publisher
• In this Subject: Earth and Environmental Sciences ,  General & Civil Engineering ,  Hydraulic & Environmental Engineering
• By this author: Novak, John T. ;  Murthy, Sudhir N.

Website © Publishing Technology. Article copyright remains with the publisher, society or author(s) as specified within the article.

• Terms and conditions
• Privacy policy
• Information for advertisers