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首页> 外文期刊>Environmental Science & Technology >Organic Matter and Modeling Redox Reactions during River Bank Filtration in an Alluvial Aquifer ofthe Lot River, France
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Organic Matter and Modeling Redox Reactions during River Bank Filtration in an Alluvial Aquifer ofthe Lot River, France

机译：法国洛特河冲积层河岸过滤过程中的有机物和氧化还原反应模型

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摘要

A 3 year study of the infiltration of Lot River water into a well field located in an adjacent gravel and clay alluvial aquifer was conducted to assess the importance of organic matter regarding the redox processes which influence groundwater quality in a positive (denitrification) or negative (Mn dissolution) manner. Chloride was used to quantify the mixing of river water with groundwater. According to modeling with PHREEQC, the biodegradation of the infiltrated dissolved organic carbon (DOCi) is not sufficient to explain the observed consequences of the redox reactions (dissolved O_2 depletion, denitrification, Mn dissolution). Another electron donor source must therefore be involved: we propose solid organic carbon (SOC) as a likely candidate, if made available for degradation by prior hydrolysis. Its contribution to redox reactions could be significant (30-80% of the total organic carbon consumed by redox reactions during river bank filtration). We show here also that even though the first few meters of infiltration are highly reactive, significant redox reactions can take place further in the aquifer, possibly affecting groundwater quality away from the river bank.
机译：进行了为期3年的研究，研究了Lot River水渗透到相邻砾石和粘土冲积含水层中的井场中的过程，以评估有机物在氧化还原过程中对正（反硝化）或负（锰的溶解）方式。氯化物用于定量河水与地下水的混合。根据使用PHREEQC进行的建模，渗透的溶解有机碳（DOCi）的生物降解不足以解释所观察到的氧化还原反应的后果（溶解的O_2消耗，反硝化，Mn溶解）。因此，必须涉及另一个电子供体来源：我们建议将固体有机碳（SOC）用作可能的候选物，如果可以通过事先水解将其降解。它对氧化还原反应的贡献可能很大（河岸过滤过程中氧化还原反应消耗的总有机碳的30-80％）。我们在这里还显示，即使前几米的渗透是高度反应性的，在含水层中还会发生明显的氧化还原反应，可能影响远离河岸的地下水质量。

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