Sulphides can be easily ...
Published by Guido Bönig-Martius, Water and waste water treatment
Sulphides can be easily removed with bivalent Iron (Fe2+). Usually you dose Iron Sulphate (FeSO4). If you have a problem with discharging Sulphates too, you can also dose bivalent Iron Chloride (FeCl2). The bivalent Iron reacts with the Sulphide to FeS, which can be removed by sedimentation. For this process it is necessary to increase the pH value from acidic to neutral or slightly alkaline.
I hope I could help you with my answer.