Antonia Terezinha De Malo,Aladir Horácio dos Santos,Alex Almeida Magalhães,Christiane Pereira Rocha, Unifor-MG, Engenharia Ambiental, rochachristiane@uol.com.br
ABSTRACT
The river studied belongs to the São Francisco River Basin and receives all the sewage produced in the city of São Roque de Minas Gerais. The accomplishment of this paper aimed to quantify the rate of deoxygenated (k1) and reairation (k2) of the Fish River water and, from these data, model the selfpurification capacity of this river based on Street-PHELPS Model (1925). The results obtained showed that the river extension is insufficient to complete its self-purification, keeping the water quality between clean water areas and areas of degradation. Based on an estimate of removal efficiency of organic material released in the Fish River, it was still possible to verify that even with a 65% efficiency in removal of the organic material released in the river, it would not show significant improvement in their ability to selfpurification.
Palavras-chaves: Fish River, water quality, self-purification.