Biological and Physical Clogging in Infiltration Wells: Effects of Well Diameter and Gravel Pack
Biological and Physical Clogging in Infiltration Wells: Effects of Well Diameter and Gravel Pack
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渗透井的生物和物理堵塞：井径和砾石充填的影响
DOI：
10.1111/gwat.13104
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发表时间：
2021
期刊：
影响因子：
2.6
通讯作者：
R. Liedl
中科院分区：
文献类型：
--
作者：
Fritz Kalwa;Martin Binder;F. Händel;Luzie Grüneberg;R. Liedl
通过小直径井（sdw），即内径小于7.5 cm（3英寸）且无砾石充填的井，重力驱动渗透进入浅层地下，已被证明是一种经济高效且灵活的管理含水层补给（MAR）工具，因为它以最少的施工工作量提供了相对较高的补给率。与砾石充填的大直径井相比，sdw的开放过滤面积要小得多，这使得低质量水通过这些井的渗透更容易发生堵塞。为了研究它们对生物和物理堵塞的敏感性，研究人员通过渗透营养贫乏但浑浊的水或营养丰富但清澈的水来评估24种不同井设置的物理模型。实验表明，较小的井径和砾石充填的缺乏增加了井对这两种堵塞的敏感性。然而，这种效应被观察到对物理堵塞比生物堵塞更明显。我们的结论是，与砾石充填的大直径井相比，sdw在高浑浊水的渗透方面表现出严重的缺点。然而，当涉及到清澈但营养丰富的水（例如，处理过的废水）的渗透时，这种缺点就不那么严重了。根据MAR项目的经济和地质环境，sdw的建设成本明显较低，可以抵消这一缺点。
Gravity‐driven infiltration into the shallow subsurface via small‐diameter wells (SDWs), i.e., wells with an inner diameter smaller than 7.5 cm (3 inches) and no gravel pack) has proven to be a cost‐efficient and flexible tool for managed aquifer recharge (MAR), as it provides relatively high recharge rates with minimal construction effort. SDWs have a significantly smaller open filter area than larger diameter wells with gravel pack, making the infiltration of low‐quality waters through these wells more at risk clogging. To investigate their susceptibility for biological and physical clogging, 24 physical models with different well setups were evaluated by infiltrating either nutrient‐poor but turbid water or nutrient‐rich but clear water. The experiments showed that smaller diameters and the lack of a gravel pack increase the well's susceptibility to both kinds of clogging. However, this effect was observed to be much more pronounced for physical than for biological clogging. Our conclusion is that SDWs show severe disadvantages with respect to the infiltration of highly turbid waters in comparison to large diameter wells with a gravel pack. Nevertheless, this disadvantage is much less severe when it comes to the infiltration of clear but nutrient‐rich waters (e.g., treated wastewater). Depending on the economic and geological circumstances of a MAR‐project, this disadvantage could be outweighed by the significantly lower construction costs of SDWs.
小直径井补给实验：萨克森州皮尔纳案例研究
影响因子：
2.8
作者：
Händel;Binder;Dietze;Dietrich
通讯作者：
Dietrich