料液浓度对鸭粪中温厌氧消化的影响

Effects of substrate concentration on anaerobic digestion process of duck feces at moderate temperature

在中温35±1℃、pH为中性条件下,采用10 L玻璃瓶作为反应器对料液浓度分别为2%、6%、10%和15%的4组鸭粪溶液进行厌氧消化实验,系统运行30 d,分析了厌氧消化过程中的COD、pH、挥发性脂肪酸(VFA)和产气量的变化。结果表明,调节料液浓度至合适的水平对鸭粪厌氧消化过程非常重要,调节鸭粪进料浓度至6%,可以使其厌氧消化获得最佳的产气效果,COD去除率为30.46%,原料干物质产气率为0.169 m3/kg,产气中甲烷含量为69.3%,产甲烷率为0.117 m3/kg。

The complete mixture anaerobic digestion experiments of duck feces for different substrate concentrations（2%,6%,10% and 15%） were done in 10 L glass pot at neuter pH and moderate temperature.The COD,pH,VFA（volatile fatty acid） and biogas yield during the process of anaerobic digestion were measured as the reaction system was running during 30 days.The results showed that the substrate concentration was a key factor in the anaerobic digestion process of duck feces.The gas volume was the largest（biogas yield 0.169 m3/kg,methane yield 0.117 m3/kg） when the substrate concentration was adjusted to 6%.Meantime,the removal rate of COD was 30.46%,and methane content in biogas was 69.3%.