Characterization of traveling waves and analytical estimation of pollutant removal in one‐dimensional subsurface bioremediation modeling
Characterization of traveling waves and analytical estimation of pollutant removal in one‐dimensional subsurface bioremediation modeling
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一维地下生物修复模型中行波的表征和污染物去除的分析估计
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
A. Valocchi
中科院分区：
文献类型：
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作者：
S. Oya;A. Valocchi
我们研究了一种原位生物修复方案中溶质前沿的行为，在这种方案中，吸收底物在注入的非吸收电子受体的存在下被本地微生物降解。锋面表现为行波，这导致有机污染物（基质）长期降解率的简单理论推导。长期降解速率取决于输入和本底溶质浓度、流速、吸附和化学计量系数，但不取决于分散和微生物动力学参数。数值模拟表明，尽管锋面速度和形状在某些条件下表现出振荡行为，但解析方法对于预测长期退化率是有效的。数值模拟还表明，只有在基质降解强烈依赖于微生物动力学参数的初始阶段之后，才能建立行波条件。
We study the behavior of solute fronts for an in situ bioremediation scenario in which a sorbing substrate is degraded by indigenous microorganisms in the presence of an injected nonsorbing electron acceptor. The fronts behave as traveling waves, which leads to a simple theoretical derivation of the long‐term degradation rate of the organic pollutant (substrate). The long‐term degradation rate is dependent upon input and background solute concentrations, the flow velocity, and the sorption and stoichiometric coefficients, but it does not depend upon dispersion and microbial kinetic parameters. Numerical simulations show that the analytical method is valid for predicting the long‐term degradation rate, although the front velocity and shape exhibit oscillatory behavior under some conditions. Numerical simulations also show that traveling wave conditions are established only after an initial phase in which substrate degradation is strongly dependent upon microbial kinetic parameters.