Bio-Degradation of Hydrogen Sulfide in Cell-Recycle Bioreactor: Bacterial Growth Kinetic Investigation

The present study focused on the investigation of various kinds of Non-structured kinetic models of sulfide oxidation by a mixed culture in semi-batch Bio-degradation of hydrogen sulfide as a key process in corrosive gas purification. According to the proposition that a uantitative relationship between bacterial growth and hydrogen sulfide elimination exists, various Non-structured kinetic models such as; Logistic, Monod, Moser, Tessier, and Verhulst have been evaluated to describe substrate utilization and bacterial growth. Natural gas was supplied to the bioreactor permutes in constant operating pressure and temperature illustrate that in the high pH condition, the maximum regression values by fitting the experimental data was obtained. In this condition, the accessible regression values for Monod, Logistic, Moser, Tessier, and Verhulst models were 0.95, 0.98, 0.91, 0.99, and 0.98; and the maximum specific growth rates were also determined tobe 0.33, 0.19, 0.31, 0.18, and 0.36 h-1 respectively, which were empirically acceptable. In addition, the maximum cell dry weight of 0.42 g.l-1 via Verhulst kinetic model was achieved at pH of 8. Besides, the results of the study reveal that the growth kinetics of the bacterial strains were significantly affected by the medium pH used in the bioreactor

Keywords:

Bio-degradation , Hydrogen sulfide , Growth kinetics , Bioreactor , Substrate utilization