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

Rao, Sudhakar M.; Asha, K.; Shivachidambaram, S

doi:10.1007/s12303-013-0007-1

Cited by 7 publications

(1 citation statement)

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“…Wastewater irrigation is the one of the most significant anthropogenic source of nitrate contamination in groundwater (Hamed et al 2013;Rao et al 2013;Nandimandalam 2012). Many places in the world depend on groundwater as a primary drinking water source.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of biological clogging on transport of nitrate in an unsaturated porous media

2014

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In order to better understand nitrogen species transport and transformation in the saturated zone, it is essential to predict the contaminant concentration in the unsaturated zone as the concentration profiles estimated from unsaturated zone forms as the input for estimation of contaminant concentration in the saturated zone. Since the nitrogen transformations occur in the presence of bacteria, there is a need to account the influence of biological clogging to develop comprehensive model of nitrogen species transport. In this study, a one-dimensional numerical model is developed to investigate the nitrogen species transport in an unsaturated porous media along with microbial clogging process. Results suggest that hydraulic conductivity is enhanced initially due to increase in the water content followed by a significant reduction at larger simulation time resulting from bioclogging. As bioclogging mitigates the hydraulic conductivity significantly, a considerable delay is observed in the ammonium nitrogen and nitrate nitrogen transport with reference to the system without bioclogging. In addition, the effect of oxygen mass transfer coefficient on biological clogging was evaluated. Numerical results suggest that as the oxygen mass transfer is decreased the ammonium nitrogen and nitrate nitrogen concentration travels a larger depth. Further numerical results strongly suggest that nitrogen species transport in the unsaturated zone is significantly affected by the presence of biological clogging.

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Section: Introductionmentioning

confidence: 99%