The Effect of Mechanical Shear on Mesophilic Anaerobic Digestion
A combination of bench scale and full-scale studies were conducted to determine the effectiveness of high intensity mechanical shear in an internal recycle loop to enhance mesophilic anaerobic digestion and its implications for routine operations of a digestion system. During short-term batch studies (56-hours) a 46% increase in biogas production was observed. In long term batch studies (20-days) there was an observed 15% increase in biogas production and increased volatile solids destruction. The observed increase in digestion efficiency was supported by a full-scale demonstration, in which increased total and volatile solids destruction was observed, 22% and 21% for the primary digester and 17.2% and 11% for the secondary digester respectively. The data also suggests that protein degradation is one of the major mechanisms associated with the observed increases in volatile solids destruction. The full-scale demonstration also determined that shear enhanced digestion can be operated without process upset, based on volatile fatty acid profile and headspace biogas composition (methane and carbon dioxide). Dewatering properties as measured by polymer demand were deteriorated in the primary digester while there was an apparent improvement in the secondary digester. High intensity shear does not appear to enhance pathogen reduction based on indicator organisms, total and fecal coliforms.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
Document Type: Research Article
Publication date: 2003-01-01
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 These proceedings are not peer reviewed.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