Characteristics of low HS concentration biogas desulfurization using a biotrickling filter: Performance and modeling analysis.

This study investigated the characteristics of low HS concentration biogas biodesulfurization using a lab-scale biotrickling filter (BTF). The influence of operational parameters on HS removal efficiency and HS distributions in packed bed was evaluated by establishing a counter-current one-dimensional multi-layer BTF model and statistical analysis of the simulation results. The overall biodesulfurization efficiency of counter-current BTF on treating low HS concentration was 92.27 ± 10.30%. The HS distribution of the BTF packed bed could be predicted by the calibrated BTF model. The influence of the operational parameters on the HS distribution of the packed bed was following the sequence of pH > empty bed retention time (EBRT) > gas-to-liquid flow ratio (G/L). The biogas biodesulfurization process was strongly related to the sulphide affinity constant. Moreover, a high substrate concentration of the SOB could further accelerate the biodesulfurization process of the biogas with low HS concentration.