SAO PAULO, Dec 20 (Reuters) - A consortium led by Brazil's Aegea on Tuesday placed the winning bid in an auction for the privatization of Corsan, a sanitation company owned by the southern Brazilian state of Rio Grande do Sul.

Aegea, which is backed by Singapore sovereign wealth fund GIC and Itausa SA, offered 4.15 billion reais ($784.22 million) for Corsan, a premium of 1.15% over the minimum bid. ($1 = 5.2919 reais) (Reporting by Andre Romani; Editing by Steven Grattan)