Impact of Bioparticle Recirculation in a Circulating Fluidized Bed Biofilm Reactor on Simultaneous Organic and Nitrogen Removal

摘要: The Circulating Fluidized Bed Biofilm Reactor (CFBBR), a bioparticle technology designed for biological nutrient removal, has been implemented to achieve considerable biodegradation efficiency and low sludge production, compared with activated system typical biofilm technology. inherent advantages of are enhanced substantially by the CFBBR, example, decoupling hydraulic retention time (HRT) from solids (SRT), large specific surface area, ideal conditions ecosystem. In this work, recirculation, as novel control method system, was demonstrated in CFBBRs. To verify impact recirculation on reactor performance, bio-kinetics hydrodynamic behavior, three lab-scale CFBBRs were developed tested carbon nitrogen removal synthetic wastewater well municipal wastewater. During all extended experiments, bioparticles slowly transferred Riser (Anoxic column) Downer (Aerobic bio-reactions, then recirculating back refreshment. A shear stress maintained order rich conditions, where predation process encouraged. Furthermore, one-dimensional (1D) model successfully combined parameters kinetics simulate dynamic area process. Two fed applied experimental tests pseudo-steady-state study recirculation. Over 285 days experiments (4 L) over 95% COD 85% TN achieved during slow circulation between (Anoxic) (Aerobic). sodium acetate source, an extremely net yield 0.034 mgVSS/mgCOD observed concomitant appearance macro-consumers aquatic worms. Another (200 days) experiment (8.5 CFBBR feasibility integrated COD, worm predation, results proved that significant performance decreasing biomass oxygen concentration while increasing expanded bed height. Subsequently, Bioparticle Enrichment-Predation (BEP circulation), comprised enrichment (in Bottom section), transportation Top predator-cultivation Top), deactivation Bottom), proposed pattern, which effectively improves enhances stability CFBBR. involving be achievable through self-balancing BEP circulation, micro-community along would provide effective system…