We’ve used a variable speed blower instead of a traditional aeration blower system for awhile now and it has been a nice addition to our operations. It lets us make sure we’re delivering the right amount of air into the activated sludge at all times, so we don’t always need to have the blower operating at a high continuous rate. We’ve seen a good reduction in our operating costs with our transition.
Of course, the most savings are seen if you have a continuously operating plant. If not, it might not provide similar results.