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APPLICATION OF GEOCHEMICAL MODELING FOR THE IDENTIFICATION OF MAIN PROCESSES AFFECTING CHANGES IN THE QUALITY OF GROUNDWATER IN THE LAZY BLEDOWSKIE WELL FIELD, SOUTHERN POLAND

Andrzej Witkowski

First published: 2018-06-20https://doi.org/10.5593/sgem2018/1.2/s02.010View metrics

Abstract

Lazy Bledowskie well field located in the area of the Upper Silesia, was established in 1959. It consisted of max. 22 wells abstracting water from the Triassic carbonate aquifer (Olkusz-Zawiercie major aquifer). This aquifer is additionally heavily drained by Zn-Pb ore mines. Due to the decreasing demand for water and the deterioration of its quality, wells were gradually excluded from operation and liquidated. Currently, only 2 wells are exploited, pumping approx. 11500 m3 /d. As a result of the overlapping impact of various factors (changes of the groundwater table related to Zn-Pb ore mining and intensive groundwater abstraction by well fields, impact of industrial areas and landfills, discharges of municipal and industrial sewage, as well as agricultural activity) there was a significant deterioration in the groundwater quality. Elevated values of total hardness, sulphates, manganese, iron, turbidity and occasionally mercury and lead were found. The PHREEQC software was used to identify the ongoing hydrogeochemical processes. The database for geochemical modeling of saturation indices for mineral phases consisted the results of 280 physicochemical analyzes of water from the ?azy B??dowskie well field. The analysis showed that the main processes forming the chemical composition of groundwater are dissolution of carbonates and oxidation of sulphides, and subsequent dissolution of oxidation products. There may also be a dedolomitization process. These processes are intensified as a result of water table fluctuation, and thus changes in the oxidation-reduction conditions.

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Title
APPLICATION OF GEOCHEMICAL MODELING FOR THE IDENTIFICATION OF MAIN PROCESSES AFFECTING CHANGES IN THE QUALITY OF GROUNDWATER IN THE LAZY BLEDOWSKIE WELL FIELD, SOUTHERN POLAND
Authors
Andrzej Witkowski
Proceedings
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 18th International Multidisciplinary Scientific GeoConference SGEM2018, Science and Technologies in Geology, Exploration and Minining
Publisher
STEF92 Technology
Year
2018
Pages
75-82
SWS Citekey
Witkowski201827582
ISSN
1314-2704
ISBN
978-619-7408-36-2
Language
en
Publication type
Conference Paper
Keywords
geochemical modelingquality of groundwater
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