Removal of Acetone and Methyl Isopropyl Ketone in a Composite Bead Biofilter

Removal of acetone and methyl isopropyl ketone (MIPK) in a composite bead biofilter was investigated. Both microbial growth rate kg and biochemical reaction rate kd would be inhibited at higher inlet concentration. For the microbial growth process, the kg value of MIPK was greater than that of acetone and the inhibitive effect for MIPK was more sensitive than that for acetone in the average inlet concentration range of 100-150 ppm. The kg value of acetone was greater than that of MIPK and the inhibitive effect was almost the same sensitivity for two ketone compounds in the average inlet concentration range of 200-300 ppm. The zero-order kinetic with the diffusion rate limitation was regarded as the most adequate biochemical reaction model. For the biochemical reaction process, the kd value of acetone was greater than that of MIPK and the inhibitive effect for MIPK was more sensitive than that for acetone in the average inlet concentration range of 100-300 ppm. The maximum elimination capacity of acetone and MIPK were 54.68 and 35.18 gC h m bed volume, respectively. The compound with less number of carbons or no side group in the main chain was easier biodegraded by the microbial.