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Sources of dissolved oxygen in monitoring and pumping wells

Hydrogeology journal, 2017-02, Vol.25 (1), p.55-66 [Peer Reviewed Journal]

Springer-Verlag Berlin Heidelberg 2016 ;Hydrogeology Journal is a copyright of Springer, 2017. ;ISSN: 1431-2174 ;EISSN: 1435-0157 ;DOI: 10.1007/s10040-016-1477-9

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  • Title:
    Sources of dissolved oxygen in monitoring and pumping wells
  • Author: Bonte, Matthijs ; Wols, Bas ; Maas, Kees ; Stuyfzand, Pieter
  • Subjects: Aquatic Pollution ; Earth and Environmental Science ; Earth Sciences ; Environmental monitoring ; Geology ; Geophysics/Geodesy ; Groundwater ; Hydrogeology ; Hydrology/Water Resources ; Mathematical models ; Monitoring ; Oxygen ; Penetration ; Permeation ; Pumping ; Waste Water Technology ; Water Management ; Water Pollution Control ; Water Quality/Water Pollution ; Wells
  • Is Part Of: Hydrogeology journal, 2017-02, Vol.25 (1), p.55-66
  • Description: Groundwater monitoring and pumping wells set in anoxic aquifers require attention to keep the groundwater free of dissolved oxygen (DO). In properly constructed monitoring or pumping wells, two processes can however still introduce oxygen to anoxic groundwater: (1) permeation of oxygen through polymer materials such as silicone, PVC, HDPE or Teflon, and (2) thermally driven convection, which can occur in all types of piezometers or wells, regardless of construction material, when the water table or pressure head is close (<10 m) to the land surface. Here, field measurements (temperature and DO well loggings) from a monitoring well in Bilthoven, the Netherlands, are combined with analytical and numerical modelling to investigate the role of both processes on oxygenation of anoxic groundwater in wells. The results of numerical and analytical modeling show that both permeation and convection can introduce oxygen into anoxic wells to near saturation concentrations. In the field data gathered, convection is primarily responsible for oxygen intrusion up to a depth of around 12 m. Oxygen intrusion through convection and permeation in monitoring and pumping wells may influence groundwater sampling and analyses, and may contribute to well clogging, depending on site conditions. The combination of field and modelling provides new insights into these processes, which can be used for both groundwater sampling and pumping well design.
  • Publisher: Berlin/Heidelberg: Springer Berlin Heidelberg
  • Language: English
  • Identifier: ISSN: 1431-2174
    EISSN: 1435-0157
    DOI: 10.1007/s10040-016-1477-9
  • Source: ProQuest Central
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