混合堆肥过程中容重的层次效应及动态变化

城市污泥、猪粪混合堆肥表明:升温期和高温期堆体容重分别为0.82g·cm^-3和0.66g·cm^-3,堆体内的氧气仍能满足微生物生长所需;降温期容重为0.58g·cm^-3,通气较充分;腐熟期容重为0.54g·cm^-3,通风充分.升温期和高温期仓门附近堆料的容重具有层次效应,降温期大部分堆料的容重具有层次效应,腐熟期堆体容重的层次效应减弱.升温期堆体中轴线附近、高温期仓内壁附近、降温期整个堆体、腐熟期仓门和中轴线附近,堆体深度对容重具有显著影响.升温期和腐熟期,仓门对容重产生显著影响.各堆肥期堆体的容重随深度的增加而呈增大的趋势,容重与堆肥时间满足二级动力学方程.

Stratification of Bulk Density and Its Dynamics in the Process of Co-Composting

Co composting of sewage sludge and pig manure was studied. At the stages of temperature starting and high temperature, the bulk density were 0.82g·cm^-3 and 0.66 g·cm^-3, respectively, but oxygen in the pile at each stage was enough for the microorganism to live on. At the stage of cooling, the bulk density was 0.58g·cm^-3, which made aeration better. The bulk density was 0 54g·cm^-3 at the stage of maturing when aeration is best. The stratified effect of bulk density occurred, near the door of the pile at the stages of starting and high temperature, almost all parts of the pile at the stage of cooling, however, it weakened at the stage of the maturing. The depth had remarkable influence upon the bulk density of compost, by the axis of the pile at the stage of the starting, near the inner wall at the stage of high temperature, for the whole pile at the stage of cooling, and near the door and axis at the stage of maturing. The door had significant effect on the bulk density for both stages of starting and maturing. The bulk density increased with the depth of the pile at every stage of composting. Dynamics of bulk density met with two order kinetic equation.