Aeration is 45 to 75 percent of what a treatment plant spends on power. The efficiency you were quoted is a clean-water number, and the gap between that and your tank is where the money goes.
Five acronyms, two questions. Where the biology lives, and how the solids get separated. Get the second one wrong and you are comparing a complete plant against half of one.
Canada’s federal effluent standards come down to four numbers and one fish test. They never name a technology, and that omission is the most commercially useful thing about them.
Canada reopened transitional authorizations in June 2024 and removed the deadline to apply. Communities that missed the 2014 window now have a route back, and continuous systems under 2,500 m³/day gain real monitoring relief.