School Of Environment And Earth Sciences

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Author: search.filters.author.Garg, V.K.Subject: search.filters.subject.Eisenia fetida

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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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    Biotransformation of bakery industry sludge into valuable product using vermicomposting
    (Elsevier, 2019) Yadav, A; Garg, V.K.
    The aim of present work was to evaluate periodic changes in bakery industry sludge during vermicomposting. Six different blends of cow dung (CD) and bakery industry sludge (BIS) containing 10 to 50% of BIS were assessed in this study. Changes in physico-chemical parameters were evaluated at 21 days interval up to 105 days. Earthworms significantly increased NPK content and EC, while decreased pH, TOC and C: N ratio of BIS. After vermicomposting, TKN, TAP and TK contents increased 2.0–3.5, 1.2–1.9 and 1.2–1.4 times, respectively as compared to initial blends. A significant reduction (65.4–83.5%) in C: N ratio was observed in all blends. The concentrations of metals were found to be higher in the vermicomposts as compared initial blends. It was inferred that bakery industry sludge spiked with cow dung can be biotransformed into valuable manure employing earthworms. © 2018 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