Investigation on the Characteristics Variation Accoding to Air Supply Capacity in Layer Manure by Composting

초록

The composting of layer manure is economical and efficiently process. In this study, the variation of composting characteristics in layer manure was investigated according to air supply capacity. The fermented compost was added in layer manure and mixed with sawdust inside composting reactors. The level of air supply capacity was varied in the range of 50～200ℓ/m³/min. During composting the temperature variations of composting piles was different. the temperatures of composting piles for T-1(50ℓ/m³/min) and T-2(100ℓ/m³/min) were reached at 40℃ and 50℃ within 2 days, respectively. For T-3(150ℓ/m³/min) and T-4(200ℓ/m³/min), their temperatures was 60℃ within same days and maintained during 8 days. Water contents decreased according to the air supply capacity; 8.9%, 15.4%, 18.0% and 18.6% for T-1, T-2, T-3 and T-4. The weight ratios of T-1, T-2, T-3 and T-4 were reduced to 12.8%, 15.6%, 18.1% and 17.9%, respectively. The decreasing volumetric ratios of T-1, T-2, T-3 and T-4 were 18.0%, 21.0%, 22.3% and 22.0%. The oxygen discharge concentrations during composting were 12 ppm for T-1, T-2 and 9 ppm for T-3 and T-4. After composting, fertilizer components such as total nitrogen(TN) and phosphorous pentoxide (P₂O5) were examined at each air supply capacity. Nitrogen contents of the T-1, T-2, T-3 and T-4 were 0.75%, 0.74%, 0.72% and 0.64%. Also, The contents of P2O5 were 0.35%, 0.40%, 0.38% and 0.42% for T-1, T-2, T-3 and T-4.

키워드