Department Of Environmental Science And Technology

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Author: search.filters.author.Garg, V.K.Subject: search.filters.subject.Heavy metals

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    Sequestration of heavy metals from contaminated water using magnetic carbon nanocomposites
    (Elsevier B.V., 2022-03-30T00:00:00) Kataria, Navish; Chauhan, Amit Kumar; Garg, V.K.; Kumar, Parmod
    Heavy metals are toxic to flora, fauna and human beings. This study focused on removing toxic metals from an aqueous medium using magnetic carbon (Fe3O4@Carbon) nanocomposites. The biogenic green synthesis approach was used to fabricate the magnetic nanocomposite using low-cost poplar sawdust powder. The characterization of the nanocomposites was done using FESEM, TEM BET and FTIR. The sequestration of Pb (II), Cu (II) and Cr (VI) from water by Fe3O4@Carbon nanocomposites were studied under batch mode. The adsorption capacities for Pb (II), Cu (II) and Cr (VI) were 151.5, 48.08, and leaves49.29 mg/g respectively. The removal of metals by magnetic composites was studied in a mono, binary and tertiary network of metal ions. Adsorption isotherms studies indicated the chemosorption of Cu (II) and Cr (VI) onto the surface of nanocomposites. The thermodynamic analysis revealed that removal of studied metals ions is spontaneous and feasible. In this study, the effectiveness of magnetic nanocomposites is also explored for the removal of other heavy metals from tap water and simulated water sample. The heavy metal removal efficiency of the nanocomposites was not affected up to thrice reuse of adsorbent. � 2022
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    A comprehensive physico-chemical quality and heavy metal health risk assessment study for phreatic water sources in Narora Atomic Power Station region, Narora, India
    (Springer Science and Business Media Deutschland GmbH, 2022-01-07T00:00:00) Singh, Manbir; Garg, V.K.
    An investigation of water quality and heavy metal distribution in the groundwater samples collected from the vicinity of Narora Atomic Power Station (NAPS), Narora, India, was conducted for the metals including Cu, Zn, Ni, Co, Cd, Pb, and Fe. A total of 16 water quality parameters were measured for all the groundwater samples, and TDS, TH, Mg2+, Ca2+, F?, and turbidity were found to be on the higher side in comparison to the prescribed limits of Indian standards. Geometrical mean concentrations for these heavy metals were found to be 0.049, 0.213, 0.23, 0.135, 0.017, 0.061, and BDL for Cu, Fe, Zn, Pb, Cd, Co, and Ni, respectively. Pb and Cd were more than the permissible limits (0.01�mg/L for Pb and 0.003 for Cd) prescribed for safe drinking water while Cu and Fe were exceeding the permissible limits of 0.05�mg/L and 0.3�mg/L in 32% and 36% samples, respectively. Health risk assessment was done by calculating total hazard quotient (THQ), and the values for all the metals were below the threshold value of 1.0 beyond which they may pose a significant risk. � 2022, The Author(s), under exclusive licence to Springer Nature Switzerland AG.
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    Management of banana crop waste biomass using vermicomposting technology
    (Elsevier Ltd, 2021-01-20T00:00:00) Mago, Monika; Yadav, Anoop; Gupta, Renuka; Garg, V.K.
    This study reports the vermicomposting of banana crop waste biomass by Eisenia fetida. Cow dung has been used as bulking agent in this study. The experiment was conducted in six vermireactors containing different ratios of banana leaf waste biomass (BL) and cow dung (CD) for 105 days. Earthworm activity significantly reduced pH, TOC, C:N and C:P ratio of the wastes. Whereas macronutrients and micronutrients content increased after vermicomposting. TOC content of wastes reduced by 40�64% and C:N ratio of the vermicomposts was in the range of 8.9�24.3. The benefit ratio for heavy metals (Cu, Fe, Zn, Cd, Pb, Mn and Cr) was in the range of 0.23�3.44. The results indicated that the growth and fecundity of the earthworms was best in the vermireactors having 20�40% BL. Finally, it was concluded that vermicomposting can be included in the overall scheme of banana crop waste management. � 2021 Elsevier Ltd
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    Comparative analysis of vermicompost quality produced from rice straw and paper waste employing earthworm Eisenia fetida (Sav.)
    (Elsevier Ltd, 2018) Sharma, K.; Garg, V.K.
    Present study was undertaken to investigate the vermicomposting of two different organic wastes (rice straw and paper waste) employing, Eisenia fetida. Nine feedstocks were prepared with different ratios of wastes using cow dung as bulking substrate. After pre-composting, worms were allowed to feed on different feedstocks for 105 days under laboratory conditions. The results showed that NPK content was higher in the vermicompost. Heavy metal content was also higher in the vermicomposts. Whereas total organic carbon and C:N ratio were lower after vermicomposting, by 17.38?58.04% and 19?102% respectively. SEM images revealed changes in the morphology of vermicompost. Earthworm growth and reproduction was significant in different feedstocks except one containing 50% rice straw depicting that this ratio is not suitable for the earthworms. Results further demonstrated that proportion of bulking substrate affect the earthworm growth and reproduction. ? 2017 Elsevier Ltd