What is a key characteristic of hydrogen sulfide in wastewater?

A key characteristic of hydrogen sulfide in wastewater is that it is colorless and has a foul odor. This gas is produced primarily by the breakdown of organic material in the absence of oxygen, such as in anaerobic conditions. Its presence in wastewater is often detected by the unpleasant smell, which can be likened to rotten eggs. Understanding this characteristic is crucial for wastewater management, as hydrogen sulfide can pose safety risks due to its toxicity and the potential for explosive conditions in high concentrations. This distinctive olfactory property is a key indicator of its presence and is critical for operators in monitoring and controlling wastewater conditions.