有机垃圾序批式厌氧消化水解动力学模型研究

在传统一级模型中引入水解有机颗粒表面积,推导并建立了片状颗粒、圆柱形颗粒和球形颗粒有机物水解修正一级模型.片状颗粒模型与传统一级模型的表达式相同.圆柱形颗粒模型和球形颗粒模型的水解速率与未水解颗粒有机物浓度并非服从一级反应动力学,而是分别与未水解颗粒有机物浓度的3/2和5/3次方成正比,且与颗粒有机物的初始浓度有关.通过试验求得有机垃圾的传统一级模型、圆柱形颗粒模型和球形颗粒模型的水解速率常数分别为0.2493、0.5378和0.6741d-1.模型预测结果与残差分析表明,有机垃圾的形状更接近于圆柱形或球形,修正一级模型比传统一级模型能更好地预测有机垃圾的水解过程.

Improved hydrolysis kinetic model for batch anaerobic digestion of organic solid waste

In this paper, improved first-order hydrolysis models of flat, cylindrical and spherical organic solid waste were formulated and established by adding the idea of surface area to the traditional first-order model. Comparison of the results shows that the flat particulate model is the same as the traditional first-order model. However, the relationships between the hydrolytic rates of the cylindrical and spherical particulate models with no hydrolyzed particulate organic matter concentration do not comply with first-order reaction dynamics, but are in direct proportion with the power of 3/2 and 5/3 of the particulate organic matter concentration, respectively, and are related to the initial particulate organic matter concentration. The hydrolytic rate constants of the traditional first-order model, the cylindrical model and the spherical model are 0. 2493, 0. 5378 and 0. 6741d^-1 based on experimental data. The results of model prediction and deviation analysis indicate that the shapes of organic solid waste are close to cylinders or spheres. Compared with the traditional first-order model, the improved first-order hydrolytic model can better predict the concentration of organic substances in the reactor.