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Risk of Collapse in Water Quality in the Guandu River (Rio de Janeiro, Brazil)

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A Commentary to this article was published on 29 April 2022

Abstract

The Guandu River, one of the main rivers in the state of Rio de Janeiro, provides water for more than nine million people in the metropolitan region. However, the Guandu has suffered from massive domestic and industrial pollution for more than two decades, leading to high levels of dissolved total phosphorus, cyanobacteria, and enteric bacteria observed during the summers of 2020 and 2021. The use of Phoslock, a palliative compound, was not effective in mitigating the levels of phosphorus in the Guandu River. Furthermore, potable water driven from the river had levels of 2-MIB/geosmin and a mud smell/taste. With all these problems, several solutions are proposed for improving the Guandu River water quality, including establishment of (i) sewage treatment plants (STPs), (ii) strict water quality monitoring, (iii) environmental recovery (e.g., reforestation), and (iv) permanent protected areas. The objective of this paper is to verify the poor water quality in the Guandu and the ineffectiveness and undesired effects of Phoslock.

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Bacha, L., Ventura, R., Barrios, M. et al. Risk of Collapse in Water Quality in the Guandu River (Rio de Janeiro, Brazil). Microb Ecol 84, 314–324 (2022). https://doi.org/10.1007/s00248-021-01839-z

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