What was found
FLIGHT RETURNED TO ATL DUE TO ODOR AND VISIBLE HAZE IN FIRST CLASS GALLEY AREA. CREW REPORTED WHEN AIRFOIL ANTI-ICE WAS SELECTED ON, A LOUD NOISE WAS HEARD, FOLLOWED BY RUSHING AIR NOISE WITH ASSOCIATED SMOKE/ODOR. AIRFOIL ANTI-ICE WAS SELECTED OFF AND NOISE CEASED, SMOKE/ODOR ALSO DISSIPATED. MAINTENANCE FOUND STRAKE ANTI-ICE DUCT DISCONNECTED IN E&E COMPARTMENT AFT OF STRAKE IN AREA OF GENERATOR CONTROL RACK. RECONNECTED DUCT AFTER REPLACING PERI-SEAL. REPLACED ANTI-ICE PRSOV PER MCC REQUEST AS A PRECAUTION. ALL FUNCTIONAL & LEAK CHECKS GOOD.