In this study, PUF will be coated with different positively charged polymeric solutions aiming at increasing the attachment capacity of the foam surface to bacteria degrading Hydrogen Sulfide (H2S) as substrate in a biotrickling filter. By means of this approach, typical negatively charged bacteria responsible for the oxidation of SRC will settle onto the foam media faster and more homogeneously, increasing the removal capacity of the unit during the start-up period and acclimatization stage compared to uncoated PUF. Aqueous solutions of polyethyleneimine, poly-d-lysine and animal collagen at different concentrations will be used as coating in SRC oxidizing cells growth on PUF during batch experiments. The solution providing the highest solid retention and cell growth will be used to coat PUF cubes filling a biotrickling filter as in a packed bed, treating H2S at high concentrations up to 100 ppmv and Empty Bed Residence Times (EBRT) as low as 5 seconds. Experimental results will be fitted to a unique theoretical model that predicts the performance of a non-adsorbing, macroporous media packed-bed biotrickling filter, and accounts for the axial distribution of the biofilm and water layer thicknesses.
Keywords: Polyurethane Foam, Hydrogen Sulfide, Biotrickling Filter, Model, Polymer Coating.