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Water 2018, 10(10), 1476; https://doi.org/10.3390/w10101476

The Impact of River Discharge and Water Temperature on Manganese Release from the Riverbed during Riverbank Filtration: A Case Study from Dresden, Germany

1
Dresden University of Applied Sciences, Friedrich-List-Platz 1, 01069 Dresden, Germany
2
DREWAG Netz GmbH Dresden, Kohlenstraße 23, 01189 Dresden, Germany
*
Author to whom correspondence should be addressed.
Received: 19 July 2018 / Revised: 10 October 2018 / Accepted: 15 October 2018 / Published: 19 October 2018
(This article belongs to the Special Issue Efficiency of Bank Filtration and Post-Treatment)
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Abstract

The climate-related variables, river discharge, and water temperature, are the main factors controlling the quality of the bank filtrate by affecting infiltration rates, travel times, and redox conditions. The impact of temperature and discharge on manganese release from a riverbed were assessed by water quality data from a monitoring transect at a riverbank filtration site in Dresden-Tolkewitz. Column experiments with riverbed material were used to assess the Mn release for four temperature and three discharge conditions, represented by varying infiltration rates. The observed Mn release was modeled as kinetic reactions via Monod-type rate formulations in PHREEQC. The temperature had a bigger impact than the infiltration rates on the Mn release. Infiltration rates of <0.3 m3/(m2·d) required temperatures >20 °C to trigger the Mn release. With increasing temperatures, the infiltration rates became less important. The modeled consumption rates of dissolved oxygen are in agreement with results from other bank filtration sites and are potentially suited for the further application of the given conditions. The determined Mn reduction rate constants were appropriate to simulate Mn release from the riverbed sediments but seemed not to be suited for simulations in which Mn reduction is likely to occur within the aquifer. Sequential extractions revealed a decrease of easily reducible Mn up to 25%, which was found to reflect the natural stratification within the riverbed, rather than a depletion of the Mn reservoir. View Full-Text
Keywords: riverbank filtration; organic matter degradation; manganese; riverbed; climate change; floods; droughts; column experiments; PHREEQC riverbank filtration; organic matter degradation; manganese; riverbed; climate change; floods; droughts; column experiments; PHREEQC
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Paufler, S.; Grischek, T.; Benso, M.R.; Seidel, N.; Fischer, T. The Impact of River Discharge and Water Temperature on Manganese Release from the Riverbed during Riverbank Filtration: A Case Study from Dresden, Germany. Water 2018, 10, 1476.

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