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The growing global water supply crisis highlights the need to implement tools that guide policy makers in controlling effluent discharges into surface water bodies, considering that the consequent poor water quality makes it unavailable for certain uses. This study proposes a methodology to aid water managers regarding licensing effluent discharge into water bodies, using a mathematical water quality model and proposing criteria to be adopted in analyzing the licensing process. The study area used to apply the water quality model and the simulation scenarios was a stretch of about 22km along the Capibaribe river between the cities of São Lourenço da Mata and Recife, Pernambuco-Brazil. The mathematical model was the QUAL-UFMG. The analyzed parameters were BOD and DO. The results showed that less than 10% of the stretch under study presents these parameters within the limits established by law for its water quality class considering preferred uses. Furthermore, it was possible to identify the critical points where it may be necessary for installed industrial plants to adapt, and points where the river still retains some depuration ability . The simulated scenarios showed that the implementation of progressive goal-setting may classify the effluent according to standards established for the river water quality class.

Outorga para Lançamento de Efluentes - Uma Metodologia de Apoio à Gestão de Recursos Hídricos