The performance of Temperature-Phased Anaerobic Digestion (TPAD) system in the stabilization of dairy cattle wastes at high solids concentrations has never been evaluated, though the process has been established as a feasible alternative to conventional mesophilic processes for the treatment of municipal wastewater sludges. The TPAD system, operating at a retention time of 14 days, was subjected to varying total solids (3.46 – 14.54%) and volatile solids (2.62 – 10.78%) concentrations of dairy cattle wastes. At total solids concentrations less than 10.35% corresponding to a system volatile solids loading of 5.82 g VS/L/d, the system achieved VS removals in the range of 37.8 – 42.6%. The maximum VS destruction of 42.6% was achieved at a total solids concentration of 10.35%. There was a drop in the system performance with respect to VS removal and methane recovery at total solids concentrations higher than 10.35%. For all total solids concentrations studied, the indicator organism counts in the biosolids were within the limits specified by U.S. EPA in 40 CFR Part 503 regulations for Class A designation.
Keywords: Anaerobic, Biosolids, Dairy Cattle, Class A, Temperature-Phased, Thermophilic
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