Autor(es)

Brandao, Igor Yannick das Neves Vasconcellos ; Silva, Pedro Henrique Barboza de Souza ; Castori, Tayna Vale ; de Souza, Yasmim Tavares ; de Souza, Ricardo Gabbay ; Batista, Aline Fontana ; Petroni, Sergio Luis Graciano ; Zanutto, Talita Correa Nazareth ; de Campos, Claudia Barbosa Ladeira ; Maass, Danielle

• Tipo de documento: Artigo Científico
• Fonte: Bioprocess and Biosystems Engineering; v. 47, n. 9, p. 13-pg., 2024-06-18.

Resumo

Rhodococcus erythropolis bacterium is known for its remarkable resistance characteristics that can be useful in several biotechnological processes, such as bioremediation. However, there is scarce knowledge concerning the behavior of this strain against different metals. This study sought to investigate the behavior of R. erythropolis ATCC 4277 against the residue of chalcopyrite and e-waste to verify both resistive capacities to the metals present in these residues and their potential use for biomining processes. These tests were carried out in a stirred tank bioreactor for 48 h, at 24 degrees C, pH 7.0, using a total volume of 2.0 L containing 2.5% (v/v) of a bacterial pre-culture. The pulp density of chalcopyrite was 5% (w/w), and agitation and oxygen flow rates were set to 250 rpm and 1.5 L-O2 min(-1), respectively. On the other hand, we utilized a waste of computer printed circuit board (WPCB) with a pulp density of 10% (w/w), agitation at 400 rpm, and an oxygen flow rate of 3.0 L-O2 min(-1). Metal concentration analyses post-fermentation showed that R. erythropolis ATCC 4277 was able to leach about 38% of the Cu present in the chalcopyrite residue (in similar to 24 h), and 49.5% of Fe, 42.3% of Ni, 27.4% of Al, and 15% Cu present in WPCB (in similar to 24 h). In addition, the strain survived well in the environment containing such metals, demonstrating the potential of using this bacterium for waste biomining processes as well as in other processes with these metals. (AU)

• Processo FAPESP: 19/07659-4 - Valorização de metais presentes em resíduos sólidos por biomineração - BIOMETALVALUE
• Beneficiário: Danielle Maass
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 19/19144-9 - Biomineração de metais presentes em resíduos de ricos em metais
• Beneficiário: Igor Yannick das Neves Vasconcellos Brandão
• Modalidade de apoio: Bolsas no Brasil - Mestrado