Suspended Air Flotation (SAF) is an emerging technology for thickening municipal WWTP solids and could be a gamechanger due to high solids loading rates approximately 10 times that of an equivalent surface area of a dissolved air flotation thickener (DAFT). Nashville Metro Water Services (MWS) is currently expanding their Biosolids Facility located at the Central Water Reclamation Facility (WRF). As part of the proposed upgrades, additional thickening capacity of approximately 100 dry tons per day (DTPD) is necessary for a total Phase 1 thickening capacity of 205 DTPD. SAF was piloted at the Biosolids Facility to evaluate treatment viability and to investigate process performance at a range of solids loading rates (SLRs) and hydraulic loading rates (HLRs) to characterize treatment limitations, and to inform system sizing for full-scale application. Data from the pilot testing will be presented on feed solids loading rates, thickened sludge concentrations, capture efficiency, and chemical consumption. Additionally, this testing investigated the potential impacts to the downstream digestion process due to the introduction of the surfactant used in the SAF process. The following three pilot tests were performed: 1. Evaluation of SAF for co-thickening combined (PS + WAS) solids with a skid-mounted SAF unit. 2. Performance evaluation of an existing DAFT with direct injection of the frothing agent used in the SAF thickening process. 3. Evaluation of the impacts of the frothing agent used in the SAF thickening process on anaerobic digester performance. The SAF system operates similarly to a DAFT in that air is introduced into the system to “float” the sludge. However, the main difference between SAF and DAFT is the use of charged micro-bubbles instead of pressurized air for flotation. The feed sludge to a SAF system is typically mixed with a conditioning polymer before being introduced into the flotation tank. After polymer addition, a froth, consisting of electrically charged surfactant-coated microbubbles of air is injected into the influent and gently mixed immediately prior to entering the flotation tank. After charged microbubbles adhere to and accumulate on the surface of the flocs, the flocs rise to the surface and collect in a floating sludge blanket. During this presentation, attendees will gain insights into how SAF thickening works, it’s performance on municipal solids, and design considerations for full scale implementation. This presentation will also discuss how SAF may be implemented at the Nashville Biosolids Facility as part of the Basis of Design for the overall improvements.