Getting the Bugs Out of Digestion and Dewatering with Thermal Hydrolysis
This paper reviews some of the work done over the last twenty years on the thermal pretreatment of sludge and particularly activated sludge. It is demonstrated that the optimum time temperature for thermal pre-treatment is 170°C for half an hour. Pre-treatment at 70°C has little or no effect on digestibility and dewaterability. The practical application of this approach in the Cambi process is demonstrated in terms of digestibility and dewaterability for the HIAS project in Norway, which has been operating 5 years. Results from 2000 for the Naestved project in Denmark demonstrate a marked improvement in the digestion of WAS. The results of land application and crop trials for hydrolysed digested cake are shown. It is concluded that the thermal hydrolysis process gives a very stackable and stable product that is a safe fertiliser for the future. This has led to the rapid adoption of the technology in Europe in the last 3 years in projects from 5 to 100mgd.
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: 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 These proceedings are not peer reviewed. 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