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Um planejamento fatorial de dois níveis foi empregado para analisar a influência da agitação, do tempo de contato, da quantidade de alga e do tipo de pré-tratamento sobre a remoção de metais pesados por algas Arribadas, num sistema em batelada contendo uma solução sintética simulando um efluente típico de fabricação de baterias. Amostras de 4 g de algas secas, moídas e peneiradas removeram 99% do chumbo de amostras de 100 mL do efluente sintético. Os percentuais máximos de remoção de zinco e ferro foram 37% e 80%, respectivamente. Como as algas arribadas são baratas, abundantes e de ocorrência natural, a remoção de chumbo através deste método pode ser vantajosa para aplicação industrial em larga escala. A two-level factorial design was employed to analyze the influence of agitation, contact time, amount of algae and type of pretreatment on heavy metal removal by Arribadas algae, in a batch system consisting of a synthetic solution simulating a typical effluent from battery manufacturing processes. Dried, ground and sieved 4 g algae samples were able to remove 99 % lead from 100 mL samples of synthetic effluent. Maximum removals for zinc and iron were 37 % and 80 %, respectively. Lead removal using this method is potentially useful for large-scale industrial applications, because Arribadas algae are cheap, abundant, naturally occurring waste materials.

Macroalgae as lead trapping agents in industrial effluents - a factorial design analysis