What causes the smell of wastewater treatment? [Basic Knowledge]

The main cause of unpleasant odors generated at wastewater treatment plants is this!

The unique smell of the wastewater treatment plant. Are you just brushing it off with "Well, it's that kind of place, so it can't be helped"? In fact, that smell is a sign that can be life-threatening for workers. ■ The source of the smell like rotten eggs A typical foul odor generated in wastewater treatment is hydrogen sulfide (H2S, which smells like rotten eggs). The troublesome part is that its specific gravity is about 1.2 times that of air. This means it is heavier than air and accumulates in "low places" such as pits and tanks. While the smell may be faint above, there is a risk of suddenly plunging your head into a high-concentration layer when you bend down. ■ Moreover, the danger of "getting used to it" Hydrogen sulfide has a strong odor at low concentrations, but at high concentrations, it can numb the sense of smell, making it undetectable. This does not mean "it smells less than before = it has become safe"; rather, it indicates that you may have entered a dangerous zone. The inability to use the presence or absence of smell as a safety gauge is the most frightening aspect of this substance. Other foul-smelling substances, such as methyl mercaptan (which smells like rotten onions) and ammonia, also exist, each with different properties. We have summarized methods to ensure safety in wastewater treatment plant inspections not relying on smell but on systems in this document.

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