Keywords
microalgae
Chlorella vulgaris
lead
chrome
How to Cite
Abstract
Heavy metal pollution represents a significant environmental threat in water bodies, particularly in regions with intense mining and agricultural activities such as Chihuahua, Mexico. This study evaluated the ability of a native strain of Chlorella vulgaris to tolerate and remove lead (Pb) and hexavalent chromium [Cr(VI)] under laboratory conditions. The microalga was cultivated in Miracle-Gro medium under controlled photoperiod, temperature, and aeration. The minimum inhibitory concentration (MIC), growth kinetics, and metal removal efficiency were assessed at 5 and 50 mg/L. Results showed that Chlorella vulgaris tolerates low concentrations of Pb and removes over 90% within the first 48 hours. In contrast, Cr(VI) exhibited significant toxicity, drastically reducing biomass even at 5 mg/L. Microscopic observations revealed cellular damage associated with Cr(VI) exposure. It is concluded that Chlorella vulgaris has high potential for bioremediation of lead-contaminated water, although critical limitations are identified for hexavalent chromium. This study supports the development of sustainable, microalgae-based technologies for wastewater treatment in northern Mexico.
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