Freeze-Thaw Treatment of RBC Sludge: A Sustainable Option for Sludge Dewatering in Cold Regions
Freeze-thaw conditioning of RBC sludge was tested using a pilot-scale freezing bed placed in a mobile freezer unit operated at −10°C. Sludge samples from a remote mining exploration facility were flown in every 2 weeks, and added to the freezing bed in layers approximately 10 cm thick. A total of 8 layers of sludge were added to the pilot unit over 3 months. The total volume of sludge added was 290 L and the average solids concentration was 2.6%. Approximately 4 months after the first layer of sludge was added, the pilot unit was removed from the freezer and thawed at ambient temperatures that varied between 17.5 and 26°C during the time of the thawing. After 10 days of thawing, 250 L of meltwater was collected through simple drainage. Meltwater had increasing turbidity, COD, TSS, VSS, nitrogen and phosphorus concentrations during the thawing period, but predominantly within the first 4 days. During the first week of thawing, the cake solids concentration increased from 2.6% to 18.4% solids, and after an additional month of thawing, the cake solids concentration was 21%. Freeze-thaw conditioning also resulted in approximately a one-log decrease in the densities of fecal coliforms and Salmonella. The results of this study showed that freeze-thaw technology successfully dewatered RBC sludge without the need for mechanical equipment, and is a sustainable option for sludge dewatering in cold regions. The final quality of the sludge cake, in this case, makes soil application feasible.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
Document Type: Research Article
Publication date: 2010-01-01
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 These proceedings are not peer reviewed.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