Priority substances that require greater attention include lubricating oils, mineral and synthetic insulators, oily effluents and sanitary effluents.
Regarding sanitary effluents’ deviations, occurrences were only recorded in February 2023, specifically for the oil and grease parameter. As for industrial effluents, there were deviations in January and February 2023, related to the parameters of sulfide, oils and greases. However, all deviations were duly addressed and, as of March, the parameters were once again in compliance with the legislation established by Conama 430/2011.
Total water discharge in all areas in megaliters, broken down by destination
Monitoring of the treatment of sanitary and industrial effluents is carried out monthly by collecting and analyzing analytical reports for each environmental control system. Furthermore, maintenance and cleaning schedules are strictly observed to ensure the proper operation of effluent storage and treatment structures, in accordance with the guidelines established by Conama resolution 430/2011.
In 2023, Belo Monte achieved efficiency rate of 96.61% for the treatment of sanitary effluents and 97.96% for industrial effluents. During operations, lubricating and insulating oils are predominantly used in turbines and transformers, in addition to oily and sanitary effluents, which undergo treatment, in accordance with current legislation. Priority substances are defined based on an analysis of risks to human health and the environment. The potential for soil and water contamination, as well as persistence and bioaccumulation, are considered. This definition is based on Conama resolutions 357/2005 and 430/2011, ABNT NBR 10.004:2004, Ordinance MS 888/430/2011, Ordinance MS 888/2021, standards of the National Water Agency (ANA), the Equator Principles and the Standards of the International Financial Corporation (IFC).
Priority substances that require greater attention include lubricating oils, mineral and synthetic insulators, oily effluents and sanitary effluents. Regarding sanitary effluents’ deviations, occurrences were only recorded in February 2023, specifically for the oil and grease parameter. As for industrial effluents, there were deviations in January and February 2023, related to the parameters of sulfide, oils and greases. However, all deviations were duly addressed and, as of March, the parameters were once again in compliance with the legislation established by Conama 430/2011.
[table “GRI-303-4-en” not found /]Total water discharge in all areas separated by the following categories: fresh water and other types of water (total dissolved solids ≤1,000 mg/L)
[table “GRI-303-4-en-b” not found /]Planet