Waste oils have been studied as a solvent for absorption and biodegradation of 7 VOC Volatility, viscosity, partition coefficient and toxicity towards VOC were investigated Choice of a solvent depends also on its availability and cost Engine oil is not appropriate to absorption of VOC because of its high volatility Hydraulic oil is the most suitable waste oil for absorption and biodegradation of VOC
Hydrodynamics of two waste oils and PDMS in a structured packing was investigated Pressure drop in the loading zone was lower than 450 Pa m-1 Loading and flooding velocities were relatively low, especially using the viscous lubricant Billet-Schultes correlations were efficient to predict the loading and flooding points and the pressure drop Scale-up calculations proved that transformer oil can be used in an industrial scale packed column
The treatment of a synthetic polluted gas containing seven volatile organic compounds (VOCs) was studied using a pilot plant in real industrial conditions. The process combined VOC absorption in silicone oil (PolyDiMethylSiloxane, i.e., PDMS), a biological regeneration of the PDMS in a two-phase partitioning bioreactor (TPPB), and a phase separation including settling and centrifugation. The TPPB was operated at a water/PDMS volume ratio of 75/25. The VOCs treatment performance was efficient during the entire test, corresponding to 10 PDMS regeneration cycles. The analysis of the content of the aqueous phase and PDMS confirmed that VOCs are progressively degraded until mineralization. The nitrogen consumption and the characterization of the microorganisms highlighted possible anoxic functioning of the biomass within the first decanter. Moreover, although the absorption and biodegradation performances were very satisfactory, the separation of all phases, essential for the PDMS recycling, was problematic due to the production of biosurfactants by the microorganisms, leading to the formation of a stable emulsion and foaming episodes. As a consequence, the packed column showed slight fouling. However, no significant increase in the pressure drop of the packed bed, as well as no significant impact on VOC absorption efficiency was observed.
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