| Autor: |
Moreira VR; Department of Sanitary and Environmental Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil., Moser PB; Diretoria Especial de Reparação e Desenvolvimento, Companhia Vale do Rio Doce, Belo Horizonte, Brazil., Guimarães RN; Diretoria Especial de Reparação e Desenvolvimento, Companhia Vale do Rio Doce, Belo Horizonte, Brazil., Xavier C; Diretoria Especial de Reparação e Desenvolvimento, Companhia Vale do Rio Doce, Belo Horizonte, Brazil., Fidelis C; Diretoria Especial de Reparação e Desenvolvimento, Companhia Vale do Rio Doce, Belo Horizonte, Brazil., Silva AFR; Department of Sanitary and Environmental Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil., Grossi LB; Department of Sanitary and Environmental Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil., Faria CV; Department of Sanitary and Environmental Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil., Santos LVS; Department of Sanitary and Environmental Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil.; Programa de Pós-Graduação em Tecnologia de Produtos e Processos, Centro Federal de Educação Tecnológica (CEFET - MG), Belo Horizonte, Brazil., Amaral MCS; Department of Sanitary and Environmental Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil. |
| Abstrakt: |
Incidents of mining dam failure have compromised the water quality, threatening the water supply. Different strategies are sought to restore the impacted area and to guarantee the water supply. One example is water treatment plants that treat high-polluted waters within the required limits for their multiple usages. The current study assesses the integration of reverse osmosis (RO) to a river water treatment plant (RWTP) installed in Brumadinho (Minas Gerais, Brazil) to treat the water from the Ferro-Carvão stream impacted by the B1 dam rupture in 2019. The RWTP started eleven months after the mining dam rupture and is equipped with eight coagulation-flocculation tanks followed by eight pressurised filters. A pilot RO plant was installed to polish the water treated by the RWTP. Water samples were collected at different points of the water treatment plant and were characterised by their physical, chemical, and biological parameters (160 in total). The results were compared with the historical data (1997-2022) to reveal the alterations in the water quality after the rupture event. The compliance with both parameters was only achieved after the RO treatment, which acted as an additional barrier to 30 contaminants. The water quality indexes (WQI) suggested that the raw surface water, even eleven months after the incident, was unfit for consumption (WQI: 133.9) whereas the reverse osmosis permeate was ranked as excellent in the rating grid (WQI: 23.7). |
