ONLINE REMOVAL OF VOLATILE SILOXANES IN SOLID-STATE ANAEROBIC DIGESTER BIOGAS USING A BIOFILTER AND AN ACTIVATED CARBON FILTER
This study tested the feasibility of using a low-cost biofilter and an activated carbon filter to remove siloxanes from solid-state anaerobic digesters that had unsteady biogas production. The digesters were dosed with three commonly found siloxanes, D3 (Hexamethylcyclotrisiloxane), D4 (Octamethylcyclotetrasiloxane), and D5 (Decamethylcyclopentasiloxane). The removal efficiency of siloxanes by a biofilter and an activated carbon filter integrated system was compared to that using an activated carbon filter only. All solid-state anaerobic digesters were healthy throughout the 42-day test. The results showed that both methods removed siloxanes at a relatively consistent level, regardless of the fluctuating biogas yields. On average, the biofilteractivated carbon filter system showed 98.13%, 96.61%, and 78.58% removal efficiency for siloxanes D3, D4, and D5, respectively, while the ones with an activated carbon filter only gave 91.39%, 81.54%, and 69.43%. Likely, the biofilter directly captured siloxanes, or partially removed water vapor from biogas which enhanced siloxanes removal in the subsequent activated carbon filter.
Corsolini, Summer, "ONLINE REMOVAL OF VOLATILE SILOXANES IN SOLID-STATE ANAEROBIC DIGESTER BIOGAS USING A BIOFILTER AND AN ACTIVATED CARBON FILTER" (2019). University Research Symposium. 257.