Removal of Hydrophobic Volatile Organic Compounds in an Integrated Process Coupling Absorption and Biodegradation -- Selection of an Organic Liquid Phase
Résumé
Since usual processes involve water as ab- sorbent, they appear not always really efficient for the treatment of hydrophobic volatile organic compound (VOC). Recently, absorption and biodegradation cou- pling in a two-phase partitioning bioreactor (TPPB) proved to be a promising technology for hydrophobic compound treatment. The choice of the organic phase, the non-aqueous phase liquid (NAPL) is based on various parameters involved in both steps of the pro- cess, hydrophobic VOC absorption in a gas - liquid contactor, and biodegradation in the TPPB. VOC sol- ubility and diffusivity in the selected NAPL, as well as NAPL viscosity, seems to be the main parameters during the absorption step, while biocompatibility, namely the absence of toxic effect of the NAPL to- wards microorganisms, non-biodegradability and VOC partition coefficient between NAPL and water were revealed as the key factors during the biodegra- dation step. The screening of the various NAPL avail- able in the literature highlighted two families of compounds matching the required conditions for the proposed integrated process, silicone oils and ionic liquids.
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