Gestão ambiental dos sedimentos de corrente do rio SãoFrancisco na região de Três Marias/ Minas Gerais

• Ano de defesa: 2010
• Autor(a) principal: Debora Fernandes Almeida
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Engenharia Metalúrgica e de Minas; Engenharia metalúrgica; Tecnologia mineral; Engenharia de minas; Metalurgia
• Link de acesso: http://hdl.handle.net/1843/MAPO-88NQQC

The São Francisco River, in the region of Três Marias (Minas Gerais), is subject to multiple environmental impacts: hydroelectric generation, zinc metallurgy, domestic sludge discharge, agriculture, forestry, among others. This doctorate aimed to assess the environmental impact caused by metal contamination of bed sediments at the São Francisco River and one of its tributaries in the region of Três Marias (MG/ Brazil). The assessment was accomplished by using the weight-ofevidence- WOE approach. The studies developed to support the assessment included: (1) metal concentration (2) metal bioavailability potential (3) metal stability/ solubilization potential, (4) sediments ecotoxicity and its cause, (5) effect of contamination upon the benthos. Based on the WOE developed, as well as on the Contaminated Sediment Remediation Guidance for Hazerdous Waste Sites (USEPAa, 2005), it was possible to suggest most adequate measures for managing impact causedby contaminated sediments. Results identified natural attenuation mechanisms for contamination. However, São Francisco River sediments need further studies because adverse effect is still uncertain.Consciência creek sediments (a direct tributary) probably represent adverse effect to biota, therefore, a remediation project was recommended. Other management measures included: 1) identification and removal of metals primary sources to river sediments, 2) monitoring sediments to refine assessment and verify decontamination progress. Results and conclusions derived from this doctorate contributed for a responsible management of contaminated sediments by subsidizing the implementation of environmental projects in the region. Moreover, for being new and systemic in this region of São Francisco River, the studies became a reference to Brazilian environmental agencies and other public interested in studying impacts caused by contaminated sites. Partnership established with researches of Universidad de Cádiz, in Spain, and with other international consultants contributed to enhance technical-scientific competence of Brazilian researchers.