Alternative analysis of BOD removal in subsurface flow constructed wetlands employing Monod kinetics.
Alternative analysis of BOD removal in subsurface flow constructed wetlands employing Monod kinetics.
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DOI：
10.1016/s0043-1354(00)00373-0
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发表时间：
2001-04
期刊：
影响因子：
12.8
通讯作者：
C. Mitchell;D. McNevin
中科院分区：
文献类型：
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作者：
C. Mitchell;D. McNevin
提出了一种新的潜流人工湿地设计和分析的机理方法。该模型是基于这样的假设，即在湿地的生物过程，像其他生物系统，表现出莫诺动力学。一个莫诺的方法很好地符合观察到的湿地性能。它预测低浓度时的一阶行为，即污染物去除率随污染物浓度的增加而增加;以及高污染物浓度时的零阶或饱和行为，即最大污染物去除率。表现出莫诺动力学的潜流人工湿地的动力学分析表明，负荷率，以及零级降解速率常数，是有效的湿地设计去除有机碳的重要参数。特别是，莫诺动力学能够识别绝对最大去除率，这是必要的，以防止设计中的尺寸过小。这是重要的，因为它代表了湿地设计的负荷率的理论上限。该分析适用于美国环保署在北美收集的湿地数据，以提取BOD去除的设计标准。结果表明，SSF湿地的BOD最大负荷至少为80 kgha-1d-1。此外，提出了一个新的无量纲性能效率参数Ω，作为比较湿地性能的一种更有效的手段。
A new, mechanistic approach for design and analysis of subsurface flow (SSF) constructed wetlands is presented. The model is based on the assumption that the biological processes in wetlands, like other biological systems, exhibit Monod kinetics. A Monod approach fits well with observed wetland performance. It predicts first-order behaviour at low concentrations, that is, pollutant removal rates which increase with increasing pollutant concentration; and zero-order or saturated behaviour at high pollutant concentrations, that is, a maximum pollutant removal rate. A kinetic analysis of subsurface flow constructed wetlands exhibiting Monod kinetics reveals that loading rate, as well as the zero-order degradation rate constant, are essential parameters for efficient wetlands design for the removal of organic carbon. In particular, Monod kinetics enables the identification of an absolute maximum removal rate which is necessary to prevent undersizing in design. This is significant because it represents a theoretical upper bound on loading rate for wetlands design. The analysis is applied to wetlands data collected in North America by the US EPA in order to extract design criteria for BOD removal. It reveals that maximum loadings for SSF wetlands are at least 80kgha−1d−1for BOD. In addition, a new dimensionless performance efficiency parameter, Ω, is presented as a more effective means of comparing wetland performance.