In wastewater applications, does the type of gas used matter (air, oxygen, ozone)?

Short Answer:

Yes. Air is most used, but other gases can be applied depending on the goal.

In-Depth Answer:

Air is the most common gas used in wastewater applications. In some cases, oxygen or ozone may be used for specific objectives such as enhanced oxygen delivery or odor and sulfide control. Gas selection depends on treatment goals, site conditions, and regulatory considerations and is evaluated on a case‑by‑case basis.