ELIMINATION OF EXCESS ORGANIC SLUDGE FROM A MOVING-BED BIOFILM PROCESS
Abstract:Total oxidation (TOX) of excess biomass by endogenous decay was applied for the elimination of secondary organic sludge as yielded by a moving-bed biofilm process utilizing PVA-gel beads as a biocarrier. In contrast to previous in-house studies treating industrial wastewaters essential free of influent suspended solids (SS), in this pilot study treatment of a municipal wastewater was considered, where influent SS could bear a significant impact on sludge decay. Excess sludge from the biological treatment units was accumulated in the TOX process where a sludge concentration of 8 g/L was maintained at a hydraulic retention time of 8 h, with low levels of effluent SS—usually below 10 mg/L—following secondary clarification. A solids mass-balance suggested a biomass yield in keeping with conventional biological treatment processes; however, this was thought to be artificially high due to the unquantifiable influence of influent SS. In addition, the observed endogenous decay coefficient was estimated to be three to four times higher than that of conventional activated sludge in keeping with results of other studies utilizing the PVA-gel biocarrier. Though further research is warranted to evaluate the effects of influent SS on the balance of solids in a TOX process over long-term operation, results here demonstrate that due to the favorable characteristics of sludge yielded from a PVA-gel process, greatly reduced production of waste sludge from municipal applications is feasible.
Document Type: Research Article
Publication date: 2007-01-01
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 These proceedings are not peer reviewed.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