Date of Award
Master of Science
Civil, Construction, and Environmental Engineering
Civil Engineering (Environmental Engineering)
In this study a lab-scale (1L) trickling biofilter was employed to investigate the feasibility of biological sulfide oxidation with the reclamation of elemental sulfur. The effect of different oxygen contents (ranging from 3% to 10%) in the gas flow was evaluated under two different sulfide loading rates of 120 mg-S/L-hr and 180 mg-S/L-hr. The results showed that at sulfide loading rate of 120 mg-S/L-hr, 93.6% of influent sulfide was removed at an oxygen content of 5% (by volume). However, at a higher sulfide loading rate of 180 mg-S/L-hr, the sulfide removal efficiency dropped to 90.8% even with the increase of the oxygen content to 10%. The gas flow rate was found to have a significant impact on the sulfide removal efficiency. Upon increasing the gas flow to 0.4 L/min from 0.2 L/min, sulfide removal efficiency dropped by 17%. A series of batch tests were also conducted to quantify the relative contribution of biotic and abiotic components in total sulfide oxidation and to evaluate the possibility of heterotrophic sulfur reducing activity. The batch test results suggest that as high as 88% of the influent sulfide could be oxidized biologically whereas abiotic oxidation could contribute up to 12% of the total oxidation. The corresponding sulfide removal rates were 811.8 mg-S/L-hr and 112.2 mg-S/L-hr, respectively. A significant sulfur reducing activity was also evident in the presence of organic matter under anaerobic condition.
Cao, Qiyong, "Bioconversion of sulfide to elemental sulfur in trickling filter" (2002). Retrospective Theses and Dissertations. 19806.