Influence of anthropogenic contamination on groundwater chemistry in Mulbagal town, Kolar District, India

Rao, Sudhakar M., Asha, K. and Sadasivam, Siva ORCID: https://orcid.org/0000-0002-2305-0292 2013. Influence of anthropogenic contamination on groundwater chemistry in Mulbagal town, Kolar District, India. Geosciences Journal 17 (1) , pp. 97-106. 10.1007/s12303-013-0007-1

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Abstract

Geochemical studies are performed to examine the impact of leachate infiltration from on-site sewage disposal systems on the groundwater chemistry in Mulbagal town, Kolar District, Karnataka State, India. The leachate infiltration imposed nitrate concentrations ranging from 4 mg/L to 388 mg/L in the groundwater samples; it was observed that 79% of the samples exhibited nitrate concentrations in excess of drinking water permissible limit (45 mg/L). The average (of 43 measurements) E. coli levels in the groundwater samples corresponded to 189 MPN/100 mL and 55% of the samples tested exhibit pathogen contamination. Results also showed that the groundwater in the study area is characterized by acidic pH, large calcium + magnesium ion and Na/Cl ratios of <unity causing majority of the ground water samples to classify as Ca-Mg-Cl type and Na-Cl type. Saturation index (SI) computation using Visual MINTEQ program showed that the groundwater samples are under-saturated with respect to calcite. The theoretical SI values (of calcite) however suggested that the groundwater samples ought to be over-saturated with calcite. Under-saturation of the groundwater samples with calcite is attributed to increased dissolution of the mineral in the acidic environment of the groundwater.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	Q Science > QD Chemistry Q Science > QE Geology
Uncontrolled Keywords:	anthropogenic; chemistry; contamination; groundwater; sewage;
Publisher:	Springer
ISSN:	1226-4806
Last Modified:	23 Oct 2022 21:56
URI:	https://orca.cardiff.ac.uk/id/eprint/46735

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