BIOSORPITION OF HEXAVALENT CHROMIUM IN MICROALGAE INACTIVE BIOMASS

Autores: Guilherme Dias¹; Matheus Hipolito²; Fernando Santos¹; Rogerio Lourega¹; Jaqueline de Mattia¹, Paulo Eichler², Matheus Vilares¹, Jonathan Alves¹

¹ Universidade Estadual do Rio Grande do Sul - guilherme-dias@uergs.edu.br

² Pontificia Universidade Catolica do Rio Grande do Sul

 

The environmental pollution caused by the disposal of heavy metals in industrial effluents is capable of causing numerous biological damages. Among them, hexavalent chromium (Cr (VI)), originating mainly from electroplating baths and leather treatment in tanneries, may represent a major environmental problem, since it is known to be a carcinogenic co pound. The present study aimed to study the viability of the inactive bimass of Chlorella sorokiniana micralgae in the bioremediation of this heavy metal, without performing any type of pretreatment in the  biomass. The methodology used was based on sample collection after determined interaction times, with the residual concentration of Cr (VI) obtained by the colorimetric method of 1,5-diphenylcarbazide. It was obtained a maximum Cr (VI) removal capacity equal to 38% for an initial concentration of biomass of 10 g L -1 , agitation of 170 RPM and temperature of 21°C, corresponding to a biosorption of 0.055 mg Cr (VI) per g of biomass, the equilibrium being reached after 100 min of interaction. The results showed a possible application for the removal of low concentrations of metal, mainly because the biomass was used without any type of pre-treatment, and the necessary conditions for the maximum removal percent ges are low energy expenditure.

Keywords: Heavy metals, effluent, contamination.

 

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