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MEMBRANE-MEDIATED EXTRACTION AND BIODEGRADATION OF VOCS FROM AIR
Citation:
Peretti, S., R. Shepherd, R. Clayton, D. Proffitt, N. Kaplan*, AND et al. MEMBRANE-MEDIATED EXTRACTION AND BIODEGRADATION OF VOCS FROM AIR. Presented at Spring National Meeting, AIChE, Atlanta, GA, March 6, 2000.
Description:
The paper discusses a project designed to evaluate the feasibility of using a membrane-supported extraction and biotreatment process to meet the National Emissions Standard for Hazardous Air Pollutants (NESHAP) for aircraft painting and depainting facilities. The proposed system will both minimize the trated volume and concentrate the volatile organic compounds (VOCs) within that treated volume to further reduce the size and cost of the control equipment. These advantages make this VOC treatment option viable over a broad range of spray booth sizes. This will be accomplished using the partitioned recirculation flow reducxtion technique and a novel VOC concentrating and biological treatment process, the Membrane BioTreatment (MBT) system. In the MBT system, VOCs are first separated from the air stream, concentrated, then metabolized by microorganisms, forming cell mass and carbon dioxide. Selective removal and concentration of VOCs from the exhaust stream enable significant reduction in the volume directed to the final control device. The system allows for independent optimization of each process: VOC removal from the air and VOC biodegradation. The system uses microporous hollow fiber membrane contactors to mediate the extraction and concentration of VOCs from the air into an organic stripping fluid (octanol).