Department of Civil and Environmental Engineering, Stanford University, 473 Via Ortega, Stanford, CA 94305, United States.
Department of Civil and Environmental Engineering, Stanford University, 473 Via Ortega, Stanford, CA 94305, United States.
Bioresour Technol. 2017 Mar;227:205-213. doi: 10.1016/j.biortech.2016.11.119. Epub 2016 Dec 8.
Kinetic models of anaerobic digestion (AD) are widely applied to soluble and particulate substrates, but have not been systematically evaluated for bioplastics. Here, five models are evaluated to determine their suitability for modeling of anaerobic biodegradation of the bioplastic poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV): (1) first-order kinetics with and without a lag phase, (2) two-step first-order, (3) Monod (4) Contois, and (5) Gompertz. Three models that couple biomass growth with substrate hydrolysis (Monod, Contois, and Gompertz) gave the best overall fits for the data (R>0.98), with reasonable estimates of ultimate CH production. The particle size limits of these models were then evaluated. Below a particle size of 0.8mm, rates of hydrolysis and acetogenesis exceeded rates of methanogenesis with accumulation of intermediates leading to a temporary inhibition of CH production. Based on model fit and simplicity, the Gompertz model is recommended for applications in which particle size is greater than 0.8mm.
厌氧消化（AD）的动力学模型广泛应用于可溶性和颗粒性底物，但尚未系统地评估用于生物塑料。在这里，评估了五个模型以确定它们用于模拟生物塑料聚（羟基丁酸酯-共-羟基戊酸酯）（PHBV）的厌氧生物降解的适用性：（1）带有和不带有滞后期的一级动力学，（2）两步一级，（3）Monod，（4）Contois，和（5）Gompertz。与底物水解耦合生物质生长的三个模型（Monod、Contois 和 Gompertz）对数据的总体拟合度最好（R>0.98），对最终 CH 产量的估计也合理。然后评估了这些模型的颗粒尺寸限制。颗粒尺寸小于 0.8mm 时，水解和乙酰生成的速率超过甲烷生成的速率，导致中间产物的积累，从而导致 CH 产量的暂时抑制。基于模型拟合度和简单性，推荐在颗粒尺寸大于 0.8mm 的情况下使用 Gompertz 模型。
