A comparative evaluation of dried activated sludge and mixed dried activated sludge with rice husk silica to remove hydrogen sulfide

The aim of this study was to investigate the effectiveness of dried activated sludge (das) and mixed dried activatedsludge with rice husk silica (das & rhs) for removal of hydrogen sulfide (h2s). two laboratory-scale filter columns (packedone litter) were operated. both systems were operated under different conditions of two parameters, namely differentinlet gas concentrations and different inlet flow rates. the das & rhs packed filter showed more than 99.96% removalefficiency (re) with empty bed residence time (ebrt) of 45 to 90 s and 300 mg/l inlet concentration of h2s. however, there decreased to 96.87% with the ebrt of 30 s. in the same condition, the das packed filter showed 99.37% re.nonetheless, the re was shown to have dropped to 82.09% with the ebrt of 30 s. the maximum elimination capacity(ec) was obtained in the das & rhs packed filter up to 52.32 g/m3h, with the re of 96.87% and h2s mass loading rate of54 g/m3h. the maximum ec in the das packed filter was obtained up to 44.33 g/m3h with the re of 82.09% and the h2smass loading rate of 54 g/m3h. after 53 days of operating time and 54 g/m3h of loading rates, the maximum pressuredrop reached to 3.0 and 8.0 (mm h2o) for the das & rhs packed and das packed filters, respectively. based on thefindings of this study, the das & rhs could be considered as a more suitable packing material to remove h2s.