静态垛好氧堆肥堆体中氧气浓度和耗氧速率的垂直分布特征

探讨堆体不同深度的氧气浓度和耗氧速率特征,对于改进堆体结构、改善堆肥工艺有重要意义.本文分析了猪粪好氧堆肥过程中,堆体不同深度氧气补充和消耗的特点及原因.在不同堆肥时期,通风充氧后,堆体各部位氧气浓度都可以恢复到17%～20.6%.停止通风后,堆体上部氧气浓度的减小速度比中、下部快,减小后氧气浓度较下部低,最低可至3%.随着堆肥的进行,停止通风后经过相同的时间,各部位通风前的氧气浓度逐渐升高,高温阶段中期以后,中、下部通风前的氧气浓度可以达到10%以上,氧气浓度的减小趋势也逐渐减缓.

Characteristics of Vertical Distribution of Oxygen Concentration and Consumption Rate in Aerobic Static Composting

It is of important to improve the composting techniques and the structure of the pile to know the vertical distribution of oxygen concentration and oxygen consumption rate. The characteristics of oxygen supplement and consumption were analyzed in aerobic static composting. The oxygen concentration at different parts of the pile could increase from 17% to 20.6% after ventilation during different stages of composting. The decrease rate of oxygen concentration at the upper part was faster than that of the middle and bottom of the pile, and the oxygen concentration at the upper part was lower, which could be 3%. After same time of stopping ventilation, the oxygen concentration before ventilation increased along with the proceeding of composting. The oxygen concentration before ventilation could be upper 10% at the middle and bottom of the pile after the middle stage of high temperature, and the decrease rate of oxygen concentration declined too.