Science Target Conference Systems, Ajman 4th International Environment Conference 2016

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Assessment of Hydro-geochemistry and Groundwater Quality of Rajshahi City in Bangladesh
Md Golam Mostafa

Last modified: 2016-01-04

Abstract


The study was carried out to understand the hydro-geochemistry and ground water quality in Rajshahi City of Bangladesh. 240 groundwater samples were collected during the year 2009 to 2010 covering pre-monsoon, monsoon and post-monsoon and 30 aquifer soil samples were collected during the monsoon in 2000 and analyzed for physical parameters and major ions. The results reveal that the groundwater was slightly acidic to neutral in nature, total hardness observed in all samples fall under the hard to very hard category. The bicarbonate and calcium concentration in the groundwater exceeded the permissible limits may be due to dissolution of calcite. The concentration of calcium, iron, manganese, arsenic and lead were far above the permissible limit in most of shallow tubewell samples. The major hydrochemical facies identified as CaHCO3 type of water using piper trilinear diagram. A higher concentration of metals including Fe, Mn, As and Pb were found indicating various health hazards. The rock- water interaction was the major geochemical process controlling the chemistry of groundwater in the study area. The study results reveal that the present state of the quality of the groundwater in Rajshahi City area was of great concern and not suitable for human consumption without adequate treatment.