TEMPORAL ANALYSIS OF WATER QUALITY IN THE RIVER: RIO DOCE AND TAXES AFTER 6 YEARS AFTER THE BREAKDOWN OF THE FUNDÃO DAM IN MARIANA/MG

• DOI: 10.22533/at.ed.3173342326093

• Palavras-chave: Water Quality, Monitoring Programs, Dissolved Iron.

• Keywords: Water Quality, Monitoring Programs, Dissolved Iron.

• Abstract:

  The collapse of the Fundão dam, in Mariana/MG on November 5th, released approximately 47 million m3 of waste into the environment. As a consequence, the water quality standards of the affected rivers were changed, which restricted the various uses of these sources for multiple purposes. Given the scale of the disaster that occurred due to the collapse of the Fundão dam, with the volume of tailings that went down the river and the extent of its consequences, periodic monitoring of the basin's physical, chemical and biological parameters in qualitative and quantitative terms is essential. This way, the Systematic Quali-Quantitative Monitoring Program (PMQQS) was implemented by the Renova Foundation. In this work, the main physical and chemical monitoring parameters of both the PMQQS and monitoring already carried out historically in the River: Rio Doce basin were analyzed, in order to identify trends in water quality, 6 years after the rupture. The Mann-Kendall and Spearman autocorrelation analyzes indicated that the dissolved iron parameter shows a tendency for its concentrations to increase even in sub-basins of the River: Rio Doce tributaries not affected by tailings, such as those of the Piranga, Santo Antônio, Caratinga, Manhuaçu rivers. and Suaçuí Grande. These results may indicate that the observed increase may be related to a general trend in the river basin.