Page 1 A Field Study of Energy Savings Realized By Replacing Rotary Lobe Blowers With Integrally Geared Centrifugal Blowers Executive Summary: Replacement of 2 of the 4 originally active rotary lobe blowers with integrally geared turbo blowers in a nitrification-denitrification process resulted in over 35% less energy used by the integrally geared centrifugal blowers along with improved process control. Phase 2 replaced the 2 remaining active rotary lobe blowers with an additional pair of integrally geared turbo blowers, this pair having about 7% higher flow capacity relative to the first pair, and resulted in over 40% energy savings relative to the rotary lobe blowers. This total energy savings can be broken into 2 components: energy saved due to increased wire to air effi

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