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Estimation of Self-Neutralisation Rates in a Lignite Pit Lake

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00005104
URN to cite this document: urn:nbn:de:bvb:703-epub-5104-6

Title data

Opitz, Joscha ; Alte, Matthias ; Bauer, Martin ; Schäfer, Wolfgang ; Söll, Thomas:
Estimation of Self-Neutralisation Rates in a Lignite Pit Lake.
In: Mine Water and the Environment. Vol. 39 (1 September 2020) Issue 3 . - pp. 556-571.
ISSN 1616-1068
DOI der Verlagsversion: https://doi.org/10.1007/s10230-020-00692-9

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Abstract

Natural anaerobic biogeochemical processes used for passive treatment of AMD were observed in the extensive shallow water zone of a polymictic pit lake in the former German lignite district of Upper Palatinate. Although continuously fed by acidic metalliferous groundwater, lake-pH increased from 3.5 to circumneutral over a little more than 10 years. The natural attenuation processes were studied and quantified using a regional surface- and groundwater flow model linked with hydrochemical monitoring datasets to establish a simple mass balance. The acidity inflow was estimated at ≈ 5900 kmol over the period 2014–2018, which corresponds to an average inflow of ≈ 1190 kmol/a. This estimate is in very good accordance with an acidity inflow rate for the period 2000–2014 estimated from acidity deposition in the sediment based on sediment core analyses plus the calculated cumulative acidity outflow based on extrapolation of pre-neutralisation acidity levels in the pit lake, together yielding a total acidity of ≈ 15,000 kmol, which corresponds to an inflow rate of ≈ 960 kmol/a. The results strongly indicate that the pit lake self-neutralised due to beneficial environmental and ecological conditions, amplified and potentially initialised by the circumneutral discharge from a chemical mine water treatment plant, and that well-known biogeochemical mechanisms such as natural microbial sulfate reduction were the driving force. The results give rise to perspectives concerning the potential development of pit lakes if ecological considerations are considered.

Further data

Item Type: Article in a journal
DDC Subjects: 500 Science > 550 Earth sciences, geology
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Hydrology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Hydrology > Chair Hydrology - Univ.-Prof. Dr. Stefan Peiffer
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-epub-5104-6
Date Deposited: 24 Sep 2020 06:07
Last Modified: 24 Sep 2020 06:07
URI: https://epub.uni-bayreuth.de/id/eprint/5104

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