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Figure 14 Full Scale Mesophilic Digester VS Reductions Lagoons 70 60 50 40 30 20 Full Scale Digester Solids Reductions 01234567 Load(kg/m3/d) California Polytechnic State University in San Luis Obispo constructed an anaerobic lagoon to treat flush waste from a 350 animal dairy (equivalent of 250 animals). The screening system removed 15 percent of the manure volatile solids. The lagoon was projected to achieve a 35 percent volatile solids conversion to gas at a loading of 0.04 kg / m3 / d. High Rate Anaerobic Reactors Wilkie reported the use of a fixed film reactor treating screened dairy manure having the volatile solids concentration of 3.2 g per liter (Wilkie 2000). The fixed film reactor achieved a 57 % COD conversion to gas. The gas contained 78 % methane. On a COD basis, the loading was approximately 10.7 kg / m3 / d. The hydraulic retention time was three days. Unfortunately, most of the potential gas production was lost in the screened and settled manure that was not processed by the fixed film digester. Dugba reported on the use of a temperature phased anaerobic sequencing batch reactor system treating dairy manure (Dugba, Zhang et al. 1997). The systems were operated at a three-day hydraulic retention time. The dairy manure was screened utilizing a 2 by 2 mm screen opening. The biogas had a methane concentration of 62 to 66 %. The sequencing batch reactors reportedly had a © Environmental Energy Company 40 www.makingenergy.com 360-923-2000PDF Image | Dairy Waste Anaerobic Digestion Handbook Options for Recovering Beneficial Products From Dairy Manure
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