Circulating Fluidized Bed Bioreactor: A Cost-effective Technology for Wastewater Treatment
This study was focused on evaluating the economic feasibility of a newly developed technology, the Circulating Fluidized Bed-Bioreactor [CFBBR] compared to alternative technologies e.g. activated sludge process [AS], moving bed bioreactor [MBBR], and sequencing batch reactor [SBR] for municipal wastewater treatment. The CFBBR combines a circulating fluidized bed and a fixed-film process for an enhanced solid-liquid mass transfer that provides higher removal rates of nitrogen and phosphorous compared to the AS, MBBR, and SBR processes. Both labscale and pilot-scale CFBBRs demonstrated > 90% COD, > 80% N and 70% P removal at a hydraulic retention time of 2 h without primary clarification. Furthermore, the observed sludge yields of 0.12-0.16 g VSS/g COD consumed in the CFBBR resulted in 75% reduction in total biosolids production compared to conventional activated sludge non BNR treatment processes. The CFBBR demonstrated the potential for significant capital cost reduction, compliance with stringent regulations, reduction of biosolids, and up to 80% reduction in space requirements. Cost modules have been developed using CapDet Works 2.5 for the different processes employing reactor sizes designed for an average daily flow of 2.6 MGD (10,000 m3/d). The cost modules consist of screening, grit chamber, primary clarifier, biological nutrient removal units, secondary clarifier, UV-disinfection, thickening, anaerobic digestion, energy recovery, dewatering and sludge handling and disposal. The CFBBR was determined to be the most cost effective technology compared to the conventional BNR-AS and other available technologies for a completely new wastewater treatment facility. Even though the CFBBR does require high recirculation volume (12 times influent flow) to fluidize particles, energy consumption of 0.33 kWh/m3 in the CFBBR is less than the energy required in the MBBR (0.39kWh/m3), SBR (0.41 kWh/m3), and in the same range of the BNR-AS (0.31 kWh/m3) for biological nutrient removal from municipal wastewater.
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: 2012-01-01
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