Avaliação do potencial de biorremediação de metais pela microalga Pseudokirchneriella subcapitata

Abstract

Microalgae are unicellular organisms capable of photosynthesis and rapid biosorption. By presenting the results in a timely manner makes is necessary to study and work in the same biotechnological tests to ascertain their ability to bioremediation. The aim of this study was to test their ability to biosorption of metals in known concentrations and growth in alternative medium contaminated with metals. For this experiment was outlined five treatments: 1) control containing autoclaved distilled water, using NPK and culture medium with Pseudokirchneriella subcapitata; 2) (T1) contained autoclaved distilled water containing aluminum chloride; 2) (T2) contained water distilled ferrous sulfate; 3) (T3) containing distilled water with zinc sulfate; 4) (T4) contained distilled water with aluminum chloride + + ferrous sulfate zinc sulfate. All assays were performed in triplicate and contained culture medium with and innocuous NPK P. subcapitata. The microalgae showed high capacity for assimilation of metals in all treatments. Both iron metals such as aluminum and zinc, and salts of nitrogen and phosphorous showed low values ​​in the culture medium filtrate, indicating efficient bioremediation of these elements by microalgae. Already in the microalgae biomass elements that showed high cumulative values ​​was nitrogen, followed by zinc, iron, phosphorus and aluminum. The rate of growth of P. subcapitata was higher when the metals were associated, indicating there is a positive relationship between aluminum, iron and zinc and that probably was responsible for decreasing the toxic effect on microalgae.