混合堆肥过程中挥发性固体含量的层次效应及动态变化

城市污泥与猪粪混合堆肥表明:升温期和高温期堆体上部有机物降解的差异较大,降温期堆体下部各层有机物降解的差异较大,且堆体内挥发性固体(VS)含量已形成明显的层次效应,腐熟期堆体中部有机物降解的差异较大,堆体内VS含量的层次效应仍很明显;不同堆肥期堆体内VS含量的差异由大到小分别为:降温期≥腐熟期>高温期>升温期,不同部位有机物降解程度由大到小为:上部>中部>下部;VS含量随时间的变化满足一级反应动力学方程,城市污泥和猪粪混合堆肥过程中VS的降解速率约为0.3kg·d^-1,VS含量降低了8.2%.

Stratification of Volatile Solid Content and Its Dynamics in the Process of Co-composting

Co-composting of sewage sludge and pig manure was conducted and it was indicated that, at the stages of temperature starting and high temperature composting, the difference of organic decomposition in the upper portion was largest among three portions of composting pile. The difference was largest in the lower part of the pile and the stratification effect of volatile solid (VS) content was formed at the stage of cooling, while it was largest in the middle and the stratification effect was still remarkable at the stage of maturity. At different stages of composting, the difference of VS content in the pile was of the order: the cooling > or = the maturity > the high temperature > the temperature starting. At each stage of composting, the difference of organic decomposition in the pile was as follows: the upper > the middle > the lower. The change of VS content met with first-order kinetics equation and decomposition rate of VS was 0.3 kg x d(-1) while average loss of VS content was 8.2% in the whole process of composting.