猪粪好氧堆制不同阶段氧气含量变化特征

Variation of oxygen concentration during aerobic composting of pig manure.

研究了不同堆肥阶段氧气浓度和耗氧速率的变化特征 .结果表明 ,不同堆肥阶段通风补充氧气所需的时间很短 ,各阶段通风后氧气浓度都恢复到 17%以上 .堆肥升温阶段、高温阶段初期耗氧速率高 ,达90 0 μl·L-1·s-1以上 ;随着堆肥的进行 ,耗氧速率逐渐降低 .经过 5～ 7d的持续高温期后 ,耗氧速率下降到10 0 μl·L-1·s-1以下 ,堆肥基本腐熟 .根据耗氧堆肥的氧气动态变化特征 ,提出了相应的通风策略 .

Analysis with oxygen monitoring system on the variation of oxygen concentration at different stages of pig manure composting showed that in a short time after ventilation at different composting stages,the oxygen concentration increased by 17% or more,and the oxygen consumption rate at temperature increasing stage and at the beginning of high temperature stage could reach up to more than 900 μl·L -1 ·s -1 ,while decreased at the stages of high temperature and of dehydration as the composting process going on.The oxygen consumption rate decreased to lower than 100 μl·L -1 ·s -1 after 5～7 days at the stage of high temperature.A ventilation strategy was proposed based on the analyses.