“SECOND GENERATION” ATAD SUCCESS STORIES – “SHOW ME THE DATA”- SEVERAL YEARS OF PERFORMANCE DATA FROM TWO CASE STUDIES OF CONVERSION FROM “FIRST GENERATION” TO “SECOND GENERATION” ATAD SYSTEMS

摘要

Autothermal Thermophilic Aerobic Digestion (ATAD) is becoming more prevalent due to itsadvantages over conventional aerobic digestion, including the generation of a Class “A” product,a relatively small footprint, and reduced biosolids volume for end use. Both the Grand ChuteMenasha West Wastewater Treatment Facility (WWTF) in Neenah, Wisconsin and the EdwardsWWTP operated by the Eagle River Water and Sanitation District located in Vail, Coloradooriginally installed “first generation” ATAD systems and have converted the systems to “secondgeneration” ATAD systems.The “second generation” ATAD systems include process modifications over the “firstgeneration” ATAD systems such as better mixing and process control that have resulted inhigher volatile solids reduction, lower product volume, less odor generation and less sidestreamimpacts at several installations. This presentation will explore the advantages of the “secondgeneration” ATAD systems over the original installations, the reasons why the two plantsdecided to convert their systems to the newer ATAD systems, and compare the actualperformance of the Edwards, Neenah and other WWTPs with regard to total and volatile solidsreduction, average reactor solids retention time (SRT) and temperature, centrate/filtrate ammoniaconcentration, dewatered cake solids concentration and fecal coliform concentration indewatered cake.