NDLI: Experimental Modelling of Chemical Clogging Processes in Dewatering Wells

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Experimental Modelling of Chemical Clogging Processes in Dewatering Wells

Content Provider	Springer Nature Link
Author	Weidner, Christoph Henkel, Sebastian Lorke, Stefanie Rüde, Thomas R. Schüttrumpf, Holger Klauder, Wiebke
Copyright Year	2012
Abstract	An extensive array of deep, large diameter wells is required to locally dewater the aquifers in the Rhenish lignite mining district in Germany, some of which are anoxic. The performance of the wells is often influenced by the precipitation of metal hydroxides, such as FeOOH or MnOOH, which causes well clogging. A laboratory study was undertaken to gain a general understanding of the clogging processes and to create a basis for testing and developing techniques that could possibly prevent or reduce the loss of well efficiency. The chemical genesis of Fe-hydroxide incrustations in a well screen section was reproduced in an experimental model under controlled boundary conditions. In the model, the clogging process was accelerated by modifying the pH and Fe concentration relative to the in situ values. The effect of clogging on the hydraulic situation in the gravel material was quantified by measuring the hydraulic head in the section of the annular gravel pack. Increases in the hydraulic gradient up to 75 % were measured. Analysis of the gravel material using a sequential extraction procedure after the experiment yielded Fe contents up to 5.4 g kg$^{−1}$. According to X-ray diffraction, the incrustations mainly consist of 6 line ferrihydrite and lepidocrocite.Eine beträchtliche Anzahl tiefer Brunnen von großem Durchmesser ist nötig, um die teilweise anoxischen Grundwasserleiter im Rheinischen Braunkohlenrevier lokal zu entwässern. Die Leistung der Brunnen wird oftmals durch die Ausfällung von Metallhydroxiden wie FeOOH oder MnOOH beeinflusst, welche eine Verockerung der Brunnen verursachen. Die hier vorgestellte Laborstudie soll zum grundsätzlichen Verständnis der Verockerungsprozesse beitragen und eine Grundlage schaffen, um potenzielle Techniken zur Prävention oder Reduktion von Verockerungserscheinungen testen und entwickeln zu können. Die chemische Entstehung von Eisenhydroxidverkrustungen in einem Brunnenabschnitt wurde in einem experimentellen Modell unter kontrollierten Rahmenbedingungen nachgebildet. Im Modell wurde der Verockerungsprozess beschleunigt, indem der pH-Wert und dieFe(II)-Konzentrationen relativ zu den in situ Werten modifiziert wurden. Der Einfluss der Verockerung auf die hydraulischen Verhältnisse im Filterkies wurde über Messungen der hydraulischen Druckhöhe innerhalb des Filterkieses quantifiziert. Der hydraulische Gradient im Filterkies stieg durch die im Verlauf des Versuches fortschreitende Verockerung um bis zu 75 % an. Analysen des Kiesmaterials mittels sequentieller Extraktion nach dem Experiment ergaben Eisengehalte von bis zu 5,4 g kg‑1. Laut röntgendiffraktometrischen Untersuchungen bestehen die Inkrustationen hauptsächlich aus 6L-Ferrihydrit und Lepidokrokit.Una amplia variedad de pozos de gran diámetro y profundidad, es requerida para agotar localmente los acuíferos, algunos de los cuales anóxicos, en el distrito minero de lignito de Renania en Alemania. El comportamiento de los pozos es frecuentemente influido por la precipitación de hidróxidos metálicos como FeOOH o MnOOH, que causa una obstrucción en los pozos. Un estudio de laboratorio fue llevado a cabo para obtener una comprensión general de los procesos de obstrucción y para crear una base para el ensayo y desarrollo de técnicas que podrían posiblemente prevenir o reducir la pérdida de eficiencia de los pozos. La génesis química de las incrustaciones de hidróxidos de Fe en una sección del pozo fue reproducida en un modelo experimental bajo condiciones límite controladas. En el modelo, el proceso de obstrucción fue acelerado modificando el pH y la concentración de Fe relativos a los valores in situ. El efecto de obstrucción en la situación hidráulica en la grava fue cuantificado midiendo la cabeza hidrostática en la sección de la grava anular. Fueron medidos incrementos en el gradiente hidráulico de hasta el 75%. El análisis de la grava usando un procedimiento de extracción secuencial después del experimento mostró contenidos de Fe de hasta 5,4 g kg_1. De acuerdo a la difracción de rayos X, las incrustaciones consistieron principalmente de ferrihidrita de seis líneas y lepidocrocita.在德国莱茵褐煤矿区有一大批大口径深井,用以对含水层进行局部疏水,其中一些疏水井处于缺氧状态。通常随着含FeOOH, MnOOH等金属氢氧化物沉淀造成的井壁堵塞,疏水井的疏水效率遭到降低。通过本文实验可以深入了解井壁的堵塞机理, 也为阻止或降低疏水井效率的损失提供了实验基础和发展依据。在可控边界条件下,本文实验模拟了在疏水井过滤段铁的氢氧化物的化学结壳过程。根据现场资料调整pH值和铁离子浓度可以加速该模型的结壳反应。通过测量环形填砾段的水头可以定量评价化学堵塞对水力性质的影响。实验测得,填砾段水力梯度增加75%。通过对模拟实验后的填砾段材料进行循序提取分析,测得含铁量达5.4g/kg。X光衍射结果表明硬壳的主要成分是六方针铁矿和纤铁矿。
Starting Page	242
Ending Page	251
Page Count	10
File Format	PDF
ISSN	10259112
Journal	Mine Water and the Environment
Volume Number	31
Issue Number	4
e-ISSN	16161068
Language	Chinese
Publisher	Springer-Verlag
Publisher Date	2012-06-17
Publisher Institution	International Mine Water Association (IMWA)
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fe hydroxide incrustation Chemical clogging Well loss Well ageing Laboratory model Open pit dewatering Energy Economics Ecotoxicology Hydrogeology Geology Sedimentology
Content Type	Text
Resource Type	Article
Subject	Water Science and Technology Geotechnical Engineering and Engineering Geology

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