Evaluation of a pilot-scale biotrickling filter as a VOC control technology for the plastic coating sector

The performance and feasibility of a biotrickling filter (BTF) pilot unit for the treatment of exhaust gases from two robotic spray paint booths at a plastic coating facility were investigated. The volatile organic compound (VOC) concentrations in the emissions of the exhaust gases from the paint booths were relatively stable, although the VOC composition depended on the applied solvent-paint formulation in the booths. The pilot plant was operated for one year at empty bed residence times (EBRTs) ranging from 30 to 93 s. The performance of the system was affected by the solvent-paint formulations. An EBRT between 30 and 40 s was enough to meet legal requirements for products containing more than 60% biodegradable compounds, whereas a minimum EBRT of 80 s was required for emissions mainly composed of hydrophobic VOCs. The dynamics of the microbial population was carried out by fluorescence in situ hybridisation (FISH), indicating a high microbial diversity with composition changes associated with the solvent-paint used. The feasibility of the BTF was evaluated, showing that this technology is economically and environmentally competitive in comparison with thermal treatment technology.

Figure optionsDownload as PowerPoint slideHighlights
► Emissions from coating process have been successfully treated using a BTF pilot unit.
► The EBRT to meet legal regulations depends on the paint-solvent used in the process.
► The BTF has been shown economically competitive in comparison with thermal treatment.
► A reduction of 66% in CO2 emissions has been estimated.
► The evolution of the microbial population was carried out by FISH.