Abstract
ABSTRACT Chemical enhanced oil recovery (cEOR) is a process that involves the injection of chemicals (like polymers) to improve oil recovery. These processes generate a lot of produced water (PW) that needs to be treated properly for final disposal in the environment. This work has the goal to evaluate the influence of the injection biopolymer guar gum on PW treatment, as well the oil removal efficiency (ORE) of a flocculant system composed by the bioflocculant chitosan and sodium dodecyl benzene sulfonate (SDBS). The flocculation-flotation experiments were planned and carried out based on a design of experiments (central composite rotatable design – CCRD). It was possible to find out that guar gum concentration did not impact oil removal efficiency in a statistically significant way. But chitosan and SDBS concentrations were statistically significant, achieving better ORE when chitosan concentration is between 50 and 100 ppm and SDBS concentration is higher than 200 ppm, achieving a maximum of 86% of ORE at concentrations of 75 ppm and 250 ppm, respectively. The findings of this study can help for better understanding of how nonionic injection biopolymers impact on PW treatment and to propose the use of chitosan as a flocculant along with SDBS to enhance PW treatment.
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