With effective wastewater ...

Published by

With effective wastewater treatment there should be no H2S formation. Usually the H2S is formed in long residence time sewers and as Sharon has stated it is extremely dangerous to staff working in treatment plants and pump stations (https://www.atsdr.cdc.gov/mmg/mmg.asp?id=385&tid=67). My introduction to this in the very beginning of my career in wastewater treatment was to watch from outside as a pump station worker enter a dry well only to collapse from H2S poisoning. By the time we got the breathing apparatus on and recovered him (about 2-3 minutes) he was dead. The local authority spent a lot of time, effort and money installing Oxygen injection/disolution systems on large flow sewers and chemical dosing (H2O2 and Ferric Chloride FeCl3) on smaller flow rate sewers in order to eliminate this problem.