Object: Electronic Auction - Hiring A Specialized Company To Supply 500,000 Kg (Five Hundred Thousand Kilos) Of A Chemical Sulfide Precipitating Agent Based On Iron Salt Added To The Solution To Minimize And Eliminate Bad Odors In Sewage Lifting Stations And Sewage Collection Networks, With The Supply Of Dosing Pumps, Hydrogen Sulfide Gas Monitoring Sensor And Storage Tanks Equipped With A Level Sensor.