ie8b05865_si_001.pdf (92.67 kB)
Method for Determining the Hydraulic-Retention Time and Operating Conditions of a Circulating-Fluidized-Bed Bioreactor with Composition Disturbances
journal contribution
posted on 2019-01-10, 00:00 authored by Junwen Luo, Wenbin Li, Yuanyuan Shao, George Nakhla, Jesse ZhuThe circulating-fluidized-bed
bioreactor (CFBBR) is a promising
technique for biological-nutrient removal (BNR) from wastewater. A
simulation-based method for determining the hydraulic-retention time
(HRT) and operating conditions of a CFBBR is proposed. When a CFBBR
operates under the constant HRT and the constant operating conditions
obtained by the proposed method, the effluent can meet the water-quality
criteria in cases with composition disturbances and implementation
errors. To reduce the HRT, two ways of adding a carbon source are
investigated: (i) increasing the minimum carbon–nitrogen ratio
of the fluctuating influent and (ii) adding a constant amount of a
carbon source. The relationships between the minimum carbon–nitrogen
ratio (TCOD increment) and the minimum HRT are obtained. These relationships
are helpful for guiding the addition of a carbon source. A case study
of a pilot-scale CFBBR for BNR is used to illustrate this method.