In the paper, a comparison of the efficiency of riverbank treatments is outlined for the Krajkowo well field, where different methods of water abstraction are used. The water is extracted from 29 vertical wells that are located at a distance of 60–80 m from the channel of the River Warta and from a horizontal well with radial drains located 5 m below the bottom of the river. The results of a two-year water-quality investigation indicate that the water quality in both types of abstraction system is influenced by the quality of river water. The water quality observed in the horizontal well is closely similar to that of the river water, with similar concentrations of sulphates, nitrates and micropollutants, but a reduction in bacteriological contamination and plankton is clearly seen. The reduction in contaminants is mainly the result of physical processes, such as mechanical entrapment of suspended material and colloids as well as bacteria and plankton. In the vertical wells, the influence of contamination from river water is also visible, but the reduction in contamination is more significant, especially in cases of bacteria, plankton, micropollutants and nitrates, and is determined by both physical and chemical processes, such as sorption, dissolution, red-ox processes and denitrification. The present research shows that river water treatment is more effective in the case of vertical wells. The most favourable distance of a well from the channel of the river, from the perspective of water quality, is 150–200 m, which corresponds to a residence time of about six months.
If the inline PDF is not rendering correctly, you can download the PDF file here.
Dillon P. 2005. Future management of aquifer recharge. Hydrogeology Journal 13 213–316.
Ghodeif K. Grischek T. Bartak R. Wahaab R. & Herlitzius J. 2016. Potential of river bank filtration (RBF) in Egypt. Environmental Earth Science 75 671. https://doi.org/10.1007/s12665-016-5454-3
Ghodeif K. Paufler S. Grischek T. Wahaab R. Souaya E. Bakr M. & Abogabal A. 2018. Riverbank filtration in Cairo Egypt — part I: installation of a new riverbank filtration site and first monitoring results. Environmental Earth Science 77 270. https://doi.org/10.1007/s12665-018-7450-2
Górski J. 2011. Quality of riverbank filtrated water on the base of Poznań City (Poland) waterworks experiences. [In:] Ray C. & Shamrukh M. (Eds): Riverbank filtration for water security in desert countries. Springer Berlin 269–279.
Górski J. & Przybyłek J. 2005. Usytuowanie studni a jakość pozyskiwanych wód z infiltracji brzegowej [Position of wells and groundwater quality in bank filtration recharge]. [In:] Sadurski A. & Krawiec A. (Eds): Współczesne Problemy Hydrogeologii 12. Wyd. UMK Toruń 219–226 (in Polish with English abstract).
Hiscock K.M. & Grischek T. 2002. Attenuation of groundwater pollution by bank filtration. Journal of Hydrology 266 139–144.
Paufler S. Grischek T. Bartak R. Ghodeif K. Wahaab R. & Boernick H. 2018. Riverbank filtration in Cairo Egypt — Part II: Detailed investigation of a new riverbank filtration site with a focus on manganese. Environmental Earth Science 77 318. https://doi.org/10.1007/s12665-018-7500-9
Przybyłek J. Dragon K. & Kaczmarek P. 2017. Hydro-geological investigations of river bed clogging at a river bank filtration site along the River Warta Poland. Geologos 23 201–214.
Przybyłek J. & Kasztelan D. 2017. Badania zmienności i zależności temperatury wód podziemnych od wód rzecznych na ujęciach infiltracyjnych [Study of variation and dependence of groundwater temperature on river water temperature on infiltration water intake]. Przegląd Geologiczny 65 1356–1362 (in Polish with English summary).
Ray C. Melin G. & Linsky R. 2003. Riverbank filtration. Kluwer Academic Publishers 366 pp.