A model that predicts the concentration of ammonia and volatile fatty acids as odor indicators was developed for anaerobic lagoons using Monod kinetics. The model used average measured parameter values as initial conditions in the lagoon and then considered fresh charges of manure to the lagoon. Simulations were done for NH4+-N, VFA and biodegradable volatile solids concentrations in the lagoon and NH3-N flux, both at 10 and 20 degrees C. Simulations were done over a 90-day treatment and storage period. At the two temperatures the concentration of NH4+-N was nearly constant (400-410 mg/L-N). The NH3-N flux was about 2.8 times higher at 20 degrees C compared to 10 degrees C. The VFA concentrations were approximately 7% higher at 20 degrees C. The biodegradable volatile solids concentrations were approximately 6% higher at 10 degrees C. Bacteria grew more than twice as fast at 20 degrees C than at 10 degrees C.
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