Modeling process is very important and valuable to predict process outcome, especially bioprocesses which are intricate. Because of complex hydrocarbon compounds and oscillations happened in the medium of process, biodegradation of mazut has not already been investigated by mathematical models. In this study, an indigenous bacterium was isolated from oil contaminated soil to investigate biodegradation of mazut at dierent experimental conditions. Data resulted from mazut degradation, pH, and electrical potential in the medium were recorded. Some reported kinetic models and combinations were investigated to practically model the process. In addition, a new equation that can predict various phenomena, was applied to functionalize changes of mazut concentration, pH, and electrical potential. Any of the kinetic models did not have potential for modeling behavior of mazut biodegradation at dierent conditions. Opposed to them, the novel equation was able to predict desirable parameter, using two variables, and functionalize data by appropriate coecients.

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