生物流化床中附着生物浓度与生物膜厚度的关联式研究

Attached biomass concentration is an important parameter that determines fluidized bioreactor efficiency. The feasibility of correlating attached biomass concentration and biofilm thickness was confirmed via empirical equations and experimental verification. The results indicate that biofilm thickness is an important parameter that correlates with biomass attachment and fluidized bed expansion. In a fluidized bioreactor with negligible wall effects and containing regular slight-heavy particles as bio-carriers, biomass attachment, bed expansion, fluidization-pressure drop curve can all linearly correlated with biofilm thickness as: m= 0.154 9δ + 0.161 8, ε₀ = 0.005 5δ +1.128 1, n = 0.028 9δ +1.212 6 and logu_t = -7.370 6logd_p + 27.148 when δ > 5 μm. The attached biomass concentration can be expressed as a function of biofilm thickness and superficial liquid velocity, which helps to understand the effect of biomass thickness and operating liquid velocity on biomass concentration. The results are beneficial for stable operation of fluidized bioreactors.