Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 11A Datun Road, Beijing 100101, PR China.
Waste Manag. 2010 Oct;30(10):1931-8. doi: 10.1016/j.wasman.2010.04.004. Epub 2010 May 15.
To simulate the substrate degradation kinetics of the composting process, this paper develops a mathematical model with a first-order reaction assumption and heat/mass balance equations. A pilot-scale composting test with a mixture of sewage sludge and wheat straw was conducted in an insulated reactor. The BVS (biodegradable volatile solids) degradation process, matrix mass, MC (moisture content), DM (dry matter) and VS (volatile solid) were simulated numerically by the model and experimental data. The numerical simulation offered a method for simulating k (the first-order rate constant) and estimating k(20) (the first-order rate constant at 20 degrees C). After comparison with experimental values, the relative error of the simulation value of the mass of the compost at maturity was 0.22%, MC 2.9%, DM 4.9% and VS 5.2%, which mean that the simulation is a good fit. The k of sewage sludge was simulated, and k(20), k(20s) (first-order rate coefficient of slow fraction of BVS at 20 degrees C) of the sewage sludge were estimated as 0.082 and 0.015 d(-1), respectively.
为了模拟堆肥过程中基质降解的动力学，本文提出了一个基于一级反应假设和热/质量平衡方程的数学模型。采用带有保温层的中试规模堆肥反应器，进行了由污水污泥和小麦秸秆组成的混合物的堆肥试验。通过模型和实验数据对生物可降解挥发性固体（BVS）降解过程、基质质量、含水率（MC）、干物质（DM）和挥发性固体（VS）进行了数值模拟。该数值模拟提供了一种模拟 k（一级反应速率常数）和估算 k(20)（20°C 时的一级反应速率常数）的方法。通过与实验值比较，成熟堆肥质量的模拟值的相对误差为 0.22%，MC 为 2.9%，DM 为 4.9%，VS 为 5.2%，这表明模拟效果良好。还模拟了污水污泥的 k 值，并估算了污水污泥中 BVS 慢速部分在 20°C 时的 k(20s)（一级反应速率常数）为 0.015 d(-1)。
