生物质分类表征蔬菜废物好氧降解模型中试检验

为发展可支持生产性堆肥设施控制的有机废物好氧降解模型,对生物质分类蔬菜废物好氧降解速率模型(即:六因子的生物质分类一级降解动力学模型Mt=M0e-kt),以及通过主因子分析法(PCA)和生物质组分归类2种方法简化得到的二因子和三因子模型,利用太湖农村生活垃圾现场堆肥中试的一次发酵试验结果,进行了模拟检验.结果表明,生物质分类表征蔬菜废物好氧降解模型能有效地模拟中试的实际降解率,模拟与实测值的pearson相关系数r＞0.966(p＜0.001);且模拟效果基本不受原料生物质组成与堆肥工况控制条件的影响.而简化模型的模拟效果明显劣于六因子模型,这可能源于各类生物质好氧降解受温度影响的机制不同,组分的动力学参数难以合并简化.

Verification of a kinetic model by pilot-scale test of aerobic thermophilic composting for vegetable waste with various biomass compositions

To develop an organic waste aerobic degradation model to control the composting process, a model of vegetable waste with various biomass compositions (a first order kinetic model with six factors Mt=M0e-kt) was compared with two-factor and three-factor models simplified by principal component analysis and by different biomass types. The three models were tested against the results of the first stage of composting in pilot-scale tests on solid waste compost from the Tai Lake region. The results show that the six factor model reflects the real rate of decomposition, with correlations between simulated and observed r>0.966, confidence degrees p<0.001. But the two simplified models did not match the actual results as well as the six factor model, perhaps because the effects of temperature on different types of biomass, and the parameters for the different factors are difficult to simplify.