Pilot Scale Solid State Anaerobic Co-digestion of Dairy Manure and Milking Parlor Wastewater

A pilot scale solid-state anaerobic co-digestion study was conducted to elucidate the feasibility of anaerobicdigestion as an effective treatment method for dairy manure (DM) and milking parlor wastewater (MPW), andit focusing mainly on the stability of anaerobic digestion process and methane production potential. Dairymanure and milking parlor wastewater were co-digested (1/0.48, w/w) in 11m3 volume reactor for 63days atthe mesophilic condition (36°C). In addition, pH, volatile fatty acids and ammonia were periodically analyzedto monitor anaerobic digestion inhibitions. The results showed that the co-digestion of DM and MPW wassuccessfully performed without any inhibition caused by ammonia and volatile fatty acids accumulation. Thepotential methane production (P) from a modified Gompertz model was about 130.5 mL g-VS-1, andapproximately 80% of the methane production was obtained during the 40 days digestion test and the lagphase was 14 days. The pilot scale SSAD (solid-state anaerobic digestion) system showed about 1.3-foldhigher methane production than lab-scale system. The results of solid-state anaerobic co-digestion of beddedpack barn dairy manure and milking parlor wastewater using pilot-scale anaerobic digester can be used as areference for the design of farm-scale anaerobic digester. KCI Citation Count: 3