| Texto completo | |
| Autor(es): |
Nogueira, Elis W.
;
Carneiro, Rodrigo B.
;
Licona, Frecia M.
;
Couto, Pamela T.
;
Dias, Maria E. S.
;
Takeda, Paula Y.
;
Brucha, Gunther
;
Damianovic, Marcia H. R. Z.
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING; v. 13, n. 5, p. 14-pg., 2025-10-01. |
| Resumo | |
Acid mine drainage (AMD) poses significant environmental challenges due to its low pH and high concentrations of sulfate and metals. The aim of this study was to evaluate the anaerobic biological treatment of AMD from a decommissioned uranium mine by using a sulfidogenic bioreactor. The system was assessed for its ability to neutralize AMD, sustain microbial activity under acidic and metal-rich conditions, and promote the removal of rare earth elements (REEs), uranium, and metals. The AMD was characterized by low pH (<4) and high concentrations of metals (Al, Fe, Mn, Si, U) and REEs (La, Ce, Nd, Pr, Y). Over a 385-day reactor operating period, synthetic AMD (Phase I) was gradually replaced with real AMD in increments of 20 % (Phase II), 50 % (Phase III), and 75 % (Phase IV), using glycerol as an electron donor at a chemical oxygen demand/sulfate ratio of 1.0. The hydraulic retention times during these phases were 0.9 +/- 0.3, 1.2 +/- 0.2, 1.4 +/- 0.3, and 1.2 +/- 0.2 days for Phases I, II, III, and IV, respectively. The reactor maintained near-neutral pH and generated alkalinity throughout the reactor operation (>250 mg-CaCO3 L-1), mainly via sulfidogenesis pathway, without adding external alkalizing agents. The REE removal exceeded 90 % for REEs and U during a stable reactor operation, which demonstrated the resilience of synergistic interactions between fermentative (e.g., Treponema and Clostridium) and non-acidophilic sulfate-reducing bacteria, including Desulfovibrio and Desulfobacterium. This study draw attention to the potential of biological treatment as a sustainable strategy for managing AMD. (AU) | |
| Processo FAPESP: | 22/10615-1 - Consolidação do conceito de biorrefinaria aplicado ao tratamento biológico de águas residuárias e de resíduos sólidos |
| Beneficiário: | Marcelo Zaiat |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 23/00648-2 - Tratamento descentralizado de água residuária hospitalar em biorreatores anaeróbios de duas fases: avaliação da remoção de antibióticos |
| Beneficiário: | Marcelo Zaiat |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 19/22532-0 - Biotransformação anaeróbia de micropoluentes orgânicos emergentes em sistema de tratamento de duplo estágio (acidogênico-metanogênico) tratando águas residuárias domésticas |
| Beneficiário: | Rodrigo Braz Carneiro |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 23/10489-9 - Tratamento descentralizado de água residuária hospitalar em biorreatores anaeróbios de duas fases: avaliação da remoção de antibióticos |
| Beneficiário: | Elis Watanabe Nogueira |
| Modalidade de apoio: | Bolsas no Brasil - Programa Fixação de Jovens Doutores |
| Processo FAPESP: | 21/01657-0 - Modelagem, simulação e otimização de reatores anaeróbios acidogênicos com regime de operação contínuo e escoamento pistonado |
| Beneficiário: | Pamela Talita do Couto |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |