Department of Civil Engineering, Building 60, Monash University, Clayton, Victoria 3800, Australia.
Water Res. 2011 May;45(10):3137-52. doi: 10.1016/j.watres.2011.03.031. Epub 2011 Mar 23.
This paper provides a comparative evaluation of the kinetic models that were developed to describe the biodegradation of nitrogen and organics removal in wetland systems. Reaction kinetics that were considered in the model development included first order kinetics, Monod and multiple Monod kinetics; these kinetics were combined with continuous-stirred tank reactor (CSTR) or plug flow pattern to produce equations to link inlet and outlet concentrations of each key pollutants across a single wetland. Using three statistical parameters, a critical evaluation of five potential models was made for vertical and horizontal flow wetlands. The results recommended the models that were developed based on Monod models, for predicting the removal of nitrogen and organics in a vertical and horizontal flow wetland system. No clear correlation was observed between influent BOD/COD values and kinetic coefficients of BOD(5) in VF and HF wetlands, illustrating that the removal of biodegradable organics was insensitive to the nature of organic matter. Higher effluent COD/TN values coincided with greater denitrification kinetic coefficients, signifying the dependency of denitrification on the availability of COD in VF wetland systems. In contrast, the trend was opposite in HF wetlands, indicating that availability of NO(3)-N was the main limiting step for nitrogen removal. Overall, the results suggested the possible application of the developed alternative predictive models, for understanding the complex biodegradation routes of nitrogen and organics removal in VF and HF wetland systems.
本文对用于描述湿地系统中氮生物降解和有机物去除的动力学模型进行了比较评价。在模型开发中考虑的反应动力学包括一级动力学、Monod 动力学和多 Monod 动力学；这些动力学与连续搅拌罐反应器（CSTR）或推流式反应器相结合，生成了将每个关键污染物在单个湿地的进出口浓度联系起来的方程。使用三个统计参数，对垂直流和水平流湿地的五个潜在模型进行了严格评估。结果表明，基于 Monod 模型开发的模型适用于预测垂直流和水平流湿地系统中氮和有机物的去除。在 VF 和 HF 湿地中，进水 BOD/COD 值与 BOD(5)的动力学系数之间没有明显的相关性，这表明可生物降解有机物的去除对有机物的性质不敏感。较高的出水 COD/TN 值与较大的反硝化动力学系数相对应，这表明反硝化作用依赖于 VF 湿地系统中 COD 的可用性。相比之下，HF 湿地的趋势则相反，表明 NO(3)-N 的可用性是氮去除的主要限制步骤。总的来说，研究结果表明，所开发的替代预测模型可能适用于理解 VF 和 HF 湿地系统中氮和有机物去除的复杂生物降解途径。
