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Indumathi M. Nambi

Bio: Indumathi M. Nambi is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Medicine & Chemistry. The author has an hindex of 21, co-authored 80 publications receiving 1777 citations. Previous affiliations of Indumathi M. Nambi include University of Illinois at Urbana–Champaign & Indian Institutes of Technology.


Papers
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Journal Article
TL;DR: In this article, the authors investigated the fate and transport mechanism of petroleum hydrocarbons (PHC) in groundwater and found that even though the effective solubilities of benzene, toluene, ethylbenzene and xylene compounds in the mixture are lower than their pure phase aqueous solubility, they can persist in the aquifer at concentrations much above the permissible acceptance limit.
Abstract: Understanding the fate and transport mechanism of petroleum hydrocarbons (PHC) in groundwater is critical after their spill is critical towards complete removal of contaminants from the aquifer. Even though the effective solubilities of benzene, toluene, ethylbenzene and xylene (BTEX) compounds in the mixture are lower than their pure phase aqueous solubilities, they can persist in the aquifer at concentrations much above the permissible acceptance limit, as potential longterm sources fo r continued groundwater contamination at many sites. Numerical simulation has been carried out in the present study for a groundwater scenario with residual source containing BTEX mixtures in light of ratelimited dissolution and sorption phenomena. It was observed that due to the mass transfer constrains, the concentration elution takes tailing effect with time for the components which are more hydrophobic in nature.

4 citations

Journal ArticleDOI
TL;DR: In this paper, a finite volume method is used to delineate the capture zones and examine the energies within. But, very little research has been reported on the energy of groundwater flow and specifically that associated with the well capture zones.

4 citations

Journal ArticleDOI
11 May 2020-Water
TL;DR: This article investigated anthropogenically induced changes of water quality, the distribution of selected pharmaceuticals, and the effects of pollution on greenhouse gas concentrations and bacterial community composition along the 800 km long Cauvery river, the main river serving as a potable and irrigation water supply in Southern India.
Abstract: Riverine systems play an important role in the global carbon cycle, and they are considered hotspots for bacterial activities such as organic matter decomposition. However, our knowledge about these processes in tropical or subtropical regions is limited. The aim of this study was to investigate anthropogenically induced changes of water quality, the distribution of selected pharmaceuticals, and the effects of pollution on greenhouse gas concentrations and bacterial community composition along the 800 km long Cauvery river, the main river serving as a potable and irrigation water supply in Southern India. We found that in situ measured pCO2 and pCH4 concentrations were supersaturated relative to the atmosphere and ranged from 7.9 to 168.7 μmol L−1, and from 0.01 to 2.76 μmol L−1, respectively. Pharmaceuticals like triclosan, carbamazepine, ibuprofen, naproxen, propylparaben, and diclofenac exceeded warning limits along the Cauvery. Proteobacteria was the major phylum in all samples, ranging between 26.1% and 82.2% relative abundance, and it coincided with the accumulation of nutrients in the flowing water. Results emphasized the impact of industrialization and increased population density on changes in water quality, riverine carbon fluxes, and bacterial community structure.

4 citations

Journal ArticleDOI
TL;DR: In this article , the potential of Ti/Sb-SnO2/PbO2 anode in disinfecting single ARB, dual ARB (pBR322-ampR and tetR), regrowth inhibition, removal of intracellular and extracellular ARGs and loss of transformation efficiency were evaluated.

3 citations

Journal ArticleDOI
TL;DR: In this paper , a hybrid bifunctional rotating drum (BRDR) has been developed and its potency in enhancing the degradation of ciprofloxacin has been demonstrated.
Abstract: Mismanaged antibiotics ending up in aquatic environment due to inadequate conventional treatment urges the need to develop powerful advanced oxidation techniques. In this study, hybrid bifunctional rotating drum reactor (BRDR) has been developed and its potency in enhancing the degradation of ciprofloxacin has been demonstrated. BRDR is a hybrid reactor that integrates – photoelectrocatalysis (PEC) and photo-electro-Fenton (PEF) processes with UVA irradiation. It consists of MoS2-TiO2-coated carbon cloth as anode and Ferrocene-functionalized graphene-coated graphite felt as cathode. BRDR system significantly improved the removal efficiency (99.9 %) as compared to individual efficiencies of PEC (71 %) and PEF (78.8 %) processes. An increase in electrode rotation speed significantly enhanced the removal without external aeration (0.059 min−1 for 60 rpm). Maximum removal rate was achieved at pH 3 (0.061 min−1) followed by 7 (0.040 min−1) and 9 (0.020 min−1). The increase in applied potential from open circuit voltage to 1.5 V improved the removal rate from 0.005 min−1 to 0.040 min−1. The mechanism of reactive oxygen species production in BRDR system is elaborated. BRDR is demonstrated to be cleaner treatment system which excludes the external chemical addition, aeration, and sludge formation.

3 citations


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TL;DR: Fluoride contamination in drinking water due to natural and anthropogenic activities has been recognized as one of the major problems worldwide imposing a serious threat to human health as mentioned in this paper, and it has been identified as a major problem worldwide.

914 citations

01 Jan 2004
TL;DR: In this paper, the effects of subinhibitory concentrations of antibiotics and disinfectants on environmental bacteria, especially with respect to resistance, are investigated and the impact on the frequency of resistance transfer by antibacterials present in the environment is questionable.
Abstract: Antibiotics, disinfectants and bacteria resistant to them have been detected in environmental compartments such as waste water, surface water, ground water, sediments and soils. Antibiotics are released into the environment after their use in medicine, veterinary medicine and their employment as growth promoters in animal husbandry, fish farming and other fields. There is increasing concern about the growing resistance of pathogenic bacteria in the environment, and their ecotoxic effects. Increasingly, antibiotic resistance is seen as an ecological problem. This includes both the ecology of resistance genes and that of the resistant bacteria themselves. Little is known about the effects of subinhibitory concentrations of antibiotics and disinfectants on environmental bacteria, especially with respect to resistance. According to the present state of our knowledge, the impact on the frequency of resistance transfer by antibacterials present in the environment is questionable. The input of resistant bacteria into the environment seems to be an important source of resistance in the environment. The possible impact of resistant bacteria on the environment is not yet known. Further research into these issues is warranted.

867 citations

Journal ArticleDOI
TL;DR: This review article is aimed at providing precise information on efforts made by various researchers in the field of fluoride removal for drinking water by broadly divided in two sections dealing with membrane and adsorption techniques.

725 citations

01 Jan 2016
TL;DR: The wastewater engineering treatment disposal and reuse is universally compatible with any devices to read and an online access to it is set as public so you can download it instantly.
Abstract: wastewater engineering treatment disposal and reuse is available in our digital library an online access to it is set as public so you can download it instantly. Our books collection hosts in multiple countries, allowing you to get the most less latency time to download any of our books like this one. Kindly say, the wastewater engineering treatment disposal and reuse is universally compatible with any devices to read.

677 citations