Department of Mechanics, Structures and Environmental Engineering, University of Cassino, via Di Biasio 43, 03043 Cassino (FR), Italy.
Waste Manag. 2011 Dec;31(12):2527-35. doi: 10.1016/j.wasman.2011.07.024. Epub 2011 Aug 17.
A mathematical model has recently been proposed by the authors to simulate the biochemical processes that prevail in a co-digestion reactor fed with sewage sludge and the organic fraction of municipal solid waste. This model is based on the Anaerobic Digestion Model no. 1 of the International Water Association, which has been extended to include the co-digestion processes, using surface-based kinetics to model the organic waste disintegration and conversion to carbohydrates, proteins and lipids. When organic waste solids are present in the reactor influent, the disintegration process is the rate-limiting step of the overall co-digestion process. The main advantage of the proposed modeling approach is that the kinetic constant of such a process does not depend on the waste particle size distribution (PSD) and rather depends only on the nature and composition of the waste particles. The model calibration aimed to assess the kinetic constant of the disintegration process can therefore be conducted using organic waste samples of any PSD, and the resulting value will be suitable for all the organic wastes of the same nature as the investigated samples, independently of their PSD. This assumption was proven in this study by biomethane potential experiments that were conducted on organic waste samples with different particle sizes. The results of these experiments were used to calibrate and validate the mathematical model, resulting in a good agreement between the simulated and observed data for any investigated particle size of the solid waste. This study confirms the strength of the proposed model and calibration procedure, which can thus be used to assess the treatment efficiency and predict the methane production of full-scale digesters.
最近，作者提出了一个数学模型来模拟以污水污泥和城市固体废物的有机部分作为进料的共消化反应器中的生化过程。该模型基于国际水协会的厌氧消化模型 1，该模型已经扩展到包括共消化过程，使用基于表面的动力学来模拟有机废物的分解以及转化为碳水化合物、蛋白质和脂质。当有机废物固体存在于反应器入口时，分解过程是整个共消化过程的限速步骤。所提出的建模方法的主要优点是，这样的过程的动力学常数不取决于废物颗粒尺寸分布（PSD），而是仅取决于废物颗粒的性质和组成。因此，可以使用任何 PSD 的有机废物样品来进行评估分解过程的动力学常数的模型校准，并且所得的值将适用于与所研究样品具有相同性质的所有有机废物，而与它们的 PSD 无关。本研究通过对具有不同颗粒尺寸的有机废物样品进行生物甲烷潜力实验，证明了这一假设。这些实验的结果用于校准和验证数学模型，从而使模拟数据与任何研究的固体废物的颗粒尺寸的观察数据之间具有良好的一致性。这项研究证实了所提出的模型和校准程序的优势，因此可以用于评估处理效率并预测大规模消化器的甲烷产量。
