BTEX aromatic hydrocarbons (benzene, toluene, ethylbenzene and xylene) are persistent and toxic pollutants from industrial activities and oil spills that significantly affect water and soil quality as well as human health. Given the limitations of physicochemical methods for the remediation of these contaminants, bioremediation, particularly through the use of microalgae such as Chlorella sp., emerges as an efficient and sustainable alternative due to its ability to biodegrade contaminating organic compounds and adapt to various environmental conditions. Hence, this study evaluated the efficiency of BTEX hydrocarbon biopurification using the microalgae Parachlorella kessleri, isolated and morphologically and molecularly characterized. Its growth kinetics were determined, obtaining an exponential phase of 120 hours, a specific growth rate μ=0.0230 h⁻¹ and a generation time G=30.15 h. ...