猪粪好氧堆制不同阶段氧气含量变化特征

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900μl·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100μl·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．

Variation of oxygen concentration during aerobic composting of pig manure

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 microl x L(-1) x 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 microl x L(-1) x s(-1) after 5-7 days at the stage of high temperature. A ventilation strategy was proposed based on the analyses.