2 – Phase Anaerobic Digestion to Achieve Class A Biosolids

In anticipation of reaching full treatment plant operating capacity and changes in the biosolids disposal regulations, the City of Lakeland, Florida decided to pursue improvements and expansion of the existing solids processing at the Glendale WRF. A design memorandum was prepared for the City presenting various processing options. Several meetings held with City representatives, representatives from Chastain-Skillman, Inc., and some of the process vendors. The selected process (2PAD with Egg-Shaped Digester) was then designed into the existing facility and is under construction. The purpose of this paper is to present some of the options considered during the selection process, to show how these options were integrated into the final design, and also to show how a proprietary process can be included in competitively bid projects.