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首页> 外文会议>1998 Joint Conference on the Environment, 1998, Mar 31-Apr 1, 1998, Albuquerque, NM >STEADY-STATE MATHEMATICAL MODELING OF GEOLOGICAL MEMBRANE EFFECTS IN AQUIFER SYSTEMS
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STEADY-STATE MATHEMATICAL MODELING OF GEOLOGICAL MEMBRANE EFFECTS IN AQUIFER SYSTEMS

机译：含水系统中地质膜作用的稳态数学建模

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This model describes steady-state membrane-induced solute concentration effects which occur when sufficient pressure differential exists across the membrane to cause hyperfiltration. Such conditions exist in some confined and perched aquifers. The results suggest the following: 1. As suggested by Fritz and Whitworth (1994), it may be difficult to perform accurate groundwater sampling when a significant CPL is present. 2. Microbial nutrients, such as nitrate, may be concentrated in the CPL. This suggests that the CPL may play a significant role in subsurface microbial processes and therefore, natural bioremediation processes. 3. The width of the CPL is inversely proportional to the differential head across the membrane and proportional to shale thickness. 4. Some solutes may reach supersaturation within the CPL due to membrane processes and precipitate. For example, heavy metals might precipitate from contaminant plumes located within the CPL. Precipitation within the CPL may also play a role in some diagenetic processes and perhaps even formation of some sedimentary ore deposits. One of the arguments against geologic membrane effects has been that the high pressure gradients used in the laboratory do not exist in nature (Nuezel, 1986). Ironically, the modeling results suggest that geologic membrane effects may be more significant at the low gradients which can exist in natural systems, producing (over time) wider CPLs containing large solute masses with the potential to affect a number of saturated zone geochemical and biological processes. Clearly, further study is warranted on this topic.
机译：该模型描述了稳态膜诱导的溶质浓度效应，当跨膜存在足够的压差以引起超滤时会发生。这些条件存在于一些密闭和栖息的含水层中。结果表明以下几点：1.正如Fritz和Whitworth（1994）所建议的，当存在大量CPL时，可能难以进行准确的地下水采样。 2.微生物营养素（例如硝酸盐）可能会浓缩在CPL中。这表明CPL可能在地下微生物过程以及自然生物修复过程中发挥重要作用。 3. CPL的宽度与跨膜的差压头成反比，与页岩厚度成正比。 4.由于膜过程和沉淀，某些溶质可能在CPL中达到过饱和状态。例如，重金属可能会从位于CPL内的污染羽流中沉淀出来。 CPL内的降水也可能在某些成岩过程中甚至可能在某些沉积矿床的形成中起作用。反对地质膜效应的论据之一是，实验室中使用的高压梯度在自然界中是不存在的（Nuezel，1986）。具有讽刺意味的是，建模结果表明，在自然系统中可能存在的低梯度下，地质膜效应可能会更显着，从而产生（随时间变化）包含较大溶质的更宽的CPL，并可能影响许多饱和区地球化学和生物过程。显然，有必要对该主题进行进一步研究。

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