Evaluation of Effect of Calcium on Scale Formation and Corrosivity of Groundwater Using GIS

摘要

The ancient Thanjavur population located in delta of River Cauvery had been dependent on surface water fordrinking until recently, wherein there is an incremental rise in augmented bore-well water supply. Incidentally,there have been observations of moderate to high scale formations by the groundwater during domesticheating, as well as consistently high record of kidney-stone (mostly calcium oxalates) occurrence in the cityand its suburbs. The present work focuses on calcium content, its desirability level and the corrosion/scalingcoefficients. One hundred two (102) samples were collected prior to monsoon season in the year 2008 fromthe study area for study of various physico-chemical parameters. In order to estimate scalability and corrosivity,two standard indices (namely Langelier Saturation Index and Ryznar Saturation Index) were used. GIS hasbeen used to develop integrated maps for demarcating zones of different calcium concentrations ingroundwater and its relation with scale and corrosion formation tendencies.