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Aqueous chemistry of anthropogenically contaminated Bengaluru lakes

Rao, S and Mogili, NV and Priscilla, A and Lydia, A (2020) Aqueous chemistry of anthropogenically contaminated Bengaluru lakes. In: Sustainable Environment Research, 30 (1).

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Official URL: https://dx.doi.org/10.1186/s42834-020-00049-5


Anthropogenic activities impact the major ion composition of fresh water sources. The inorganic species are likely to be influenced by mineral dissolution, mineral precipitation, redox and ion-exchange reactions in the contaminated lakes. Owing to paucity of research, this study examines the influence of bio-geochemical reactions on the major ion composition of sewage contaminated Bengaluru lakes. The selected lakes represent water bodies in the major valley systems of the city that are polluted by partly treated sewage and stormwater runoffs. Hydrogeochemical facies of the lake samples showed that enrichment of Mg2+, Na+, Cl- and SO42- ions from anthropogenic contamination altered the chemical type of the lake-water. Examination of processes influencing the major ion composition of surface waters indicated that evaporation than rock-weathering tends to influence the chemical composition of the Bengaluru lakes. Precipitation of carbonate minerals in the alkaline pH contributed to the deficiency of alkaline earth ions, while dissolution of anthropogenic gypsum enhanced the SO42- ion concentration of the lakes. Solute diffusion from lake water into the pore solutions of sediments and ion-exchange reactions between monovalent ions of sediments and divalent cations in lake water are additional pathways that influence the major ion composition of the contaminated lakes. Besides alterations in major ion composition, organic contamination, biochemical reactions associated with photosynthesis activity of algae and release of toxic Al3+ ions from mineral dissolution are consequences of the lake contamination. © 2020 BioMed Central Ltd.. All rights reserved.

Item Type: Journal Article
Publication: Sustainable Environment Research
Publisher: BioMed Central
Additional Information: Copy right for this article belongs to BioMed Central
Keywords: Anthropogenic, Lakes, Geochemistry, Pollution, Wastewater
Department/Centre: Division of Mechanical Sciences > Centre for Sustainable Technologies (formerly ASTRA)
Division of Mechanical Sciences > Civil Engineering
Date Deposited: 27 Oct 2020 06:20
Last Modified: 27 Oct 2020 06:20
URI: http://eprints.iisc.ac.in/id/eprint/66112

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