Handling ethanol-gasoline vapors

[airbus]

I'm looking for information of refineries experiences handling ethanol-gasoline vapors from truck loading racks in their flare system, and the impact ethanol has in the operation of the waste water treatment plant. In some systems, these vapors will mix with water (in headers, FGR units, Faler KO drums, Sour water Stripping units,etc.) and will end up in Waste water units. What steps have benn taken to manage this situation?
Thanks in advance for sharing your information.