Abstract
Hazaribagh is a densely populated area of Dhaka city where about 185 leather processing industries have been operating and discharging solid and liquid wastes directly to the low-lying areas, river and natural canals without proper treatment. The area is covered by alluvial deposits of Holocene age and is underlain by Pleistocene Madhupur clay. The Dupi Tila Formation of Mio-Pliocene age underlain by this yellowish gray to brick red clay bed serves as the main water-bearing aquifer of Dhaka city. To assess the environmental degradation as well as the groundwater environment, major anions, cations and heavy metals of water samples, heavy metals and organic carbon content of sediment samples were analyzed in this study. Analyses of tannery effluent detect high concentration of Na+, Mg2+, Cl− and SO 2−4 followed by Ca2+, NH +4 and K+ with remarkable contents of some trace elements, mainly Cr, Fe, Mn, S, Ni and Pb. Higher accumulations of Cr, Al and Fe are observed in topsoil samples with significant amounts of Mn, Zn, Ni and Cu. Concentrations of ions and all the investigated trace elements of sampled groundwater were within the maximum allowable limit for drinking water of the Department of Environment, Bangladesh (DoE), and World Health Organization (WHO). However, excessive concentrations of Cr, Pb, etc., have already been reported in the shallow groundwater (10–20 m) of the area. Due to excessive withdrawal the vulnerability of groundwater contamination in deeper parts cannot be avoided for the future.
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Acknowledgement
The authors would like to thank Dr. Jorn Breuer, Institute of Agricultural Chemistry, University of Hohenheim, Mrs. Renate Riehle and Mrs. Anne Hartmann-Renz, Institute for Geology and Paleontology, University of Tuebingen, for their good support in the respective laboratories in Germany performing hydro and geochemical analyses. This study was funded by the German Academic Exchange Service (DAAD).
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Zahid, A., Balke, K.D., Hassan, M.Q. et al. Evaluation of aquifer environment under Hazaribagh leather processing zone of Dhaka city. Environ Geol 50, 495–504 (2006). https://doi.org/10.1007/s00254-006-0225-1
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DOI: https://doi.org/10.1007/s00254-006-0225-1