Abstract
Acetone is the most common chemical used in the Hsinchu Science Park in Taiwan. The three-phase airlift biore-actor was designed to absorb acetone into the 39 L of medium solution and then degraded by 2-L polyacryl-amide (PAA)-entrapped Thiosphaera pantotropha cell beads. The airlift medium was successfully regenerated and circulated for more than 5 months. The elimination capacity of 350-part per million (ppm) acetone at 10 L ∙ min−1 was 258.4 g · m−3hr−1 (160.4 g-C · m−3hr−1) with 100% removal efficiency in Stage II, higher than previously reported biofiltration results. The maximum chemical oxygen demand:nitrogen ratio of 100:2.9 is achieved, and a balanced nutrient state was indicated by the change in redox potential. The pH of the system was maintained at neutral because of the strong buffer agent added to the medium (final buffer intensity, β=1.18 ×10-2 M). The PAA-entrapped cell beads could also provide a good barrier for high salinity gradient environment and the inoculum source to maintain steady operation of the system.
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