Conclusions
The results of this experimental investigation have proved that the immobilized P. putida CH11 biofilter has
high potency in removing hydrogen sulfide at concentrations as low as 10 ppm or as high as 150 ppm. This
biofilter achieved better than 96% removal efficiency at flow rates below 72 L/h. The main product of H2S
oxidation by P. putida CH11 was identified as elemental sulfur. Since the neutral element sulfur does not reduce
pH and cause acidification of the biofilter, there is a significant advantage in applying this biofilter. The removal capacity of the biofilter was shown to increase with temperature elevation when high inlet concentrations were applied. Finally, the low H2S saturation constant indicates a high biomass affinity for hydrogen sulfide. Therefore, the biofilter packed with
immobilized P. putida CH11 seems to be an effective method for controlling of H2S emissions.