TY - GEN
T1 - Circulating fluidized bed bioreactor
T2 - 85th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2012
AU - Chowdhury, Nabin
AU - Nakhla, George
AU - Cairns, Bill
AU - Zhu, Jesse
N1 - Publisher Copyright:
Copyright © 2012 Water Environment Federation. All Rights Reserved.
PY - 2012
Y1 - 2012
N2 - 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 lab-scale 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.
AB - 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 lab-scale 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.
KW - Biological nutrient removal
KW - Energy costs
KW - Fixed-film
KW - Fluidized-bed bioreactor
KW - Life-cycle costs
UR - http://www.scopus.com/inward/record.url?scp=85070462656&partnerID=8YFLogxK
U2 - 10.2175/193864712811708428
DO - 10.2175/193864712811708428
M3 - Conference contribution
AN - SCOPUS:85070462656
T3 - WEFTEC 2012 - 85th Annual Technical Exhibition and Conference
SP - 4021
EP - 4031
BT - WEFTEC 2012 - 85th Annual Technical Exhibition and Conference
PB - Water Environment Federation
Y2 - 29 September 2012 through 3 October 2012
ER -
