Abstract

RAMOS LUCIA, Chulle; RUIZ JULIO, Chico  and  MENDOZA LUIS, León. Evaluation of the bioremoval potential of lead in a photobioreactor by Spirulina platensis and Pseudomonas aeruginosa. Arnaldoa [online]. 2022, vol.29, n.2, pp.267-276.  Epub Aug 30, 2022. ISSN 1815-8242.  http://dx.doi.org/10.22497/arnaldoa.292.29105.

Lead is a heavy metal that, due to its physicochemical properties, defines it as a bioaccumulative, persistent and toxic contaminant in soil and water bodies. Bioremediation is a sustainable and ecological alternative for the removal of this contaminant. Microorganisms such as Spirulina platensis and Pseudomonas aeruginosa are widely used for their ability to bioadsorb lead, therefore, the objective of this research was to evaluate the bioremoval potential of lead in a photobioreactor by both microorganisms in a free state and immobilized with calcium alginate. Three different concentrations of 10, 20 and 30 mg/L of lead nitrate were used, Hoagland medium was used with Spirulina platensis and CASO broth with Pseudomonas aeruginosa. The ANOVA statistical test showed that there is no significant difference in the concentration of chlorophyll “a” between the different treatments with Spirulina platensis, however, there is a significant difference in the percentage of elimination between both microorganisms, but, the Tukey test, It stands out that there is no difference in the media between the treatments with Spirulina platensis, Pseudomonas aeruginosa and Spirulina consortium with Pseudomonas, therefore, the difference lies in the bioadsorption capacity in different concentrations of lead nitrate. The authors infer that both microorganisms are exceptional for the removal of this contaminant, however, it is necessary to perform more tests under different conditions.

Keywords : Spirulina platensis; Pseudomonas aeruginosa; lead nitrate; bioremediation.

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