Analysis and advanced characterization of municipal solid waste vermicompost maturity for a green environment

Vaibhav Srivastava, Gaurav Goel, Vijay Kumar Thakur, Rajeev Pratap Singh*, Ademir Sergio Ferreira de Araujo, Pooja Singh

*Corresponding author for this work

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Abstract

Rapid demographic expansion along with increasing urbanization has aggravated the problem of solid waste management. Therefore, scientists are seeking waste management methods that are eco-friendly, cost effective and produce immediate results. In the developing world, municipal solid waste (MSW) contains mostly organic substances, therefore vermicomposting could be a better and cost-effective option for waste management. In this study, vermicomposting of organic portion of MSW with cow dung (additive) was performed using Eisenia fetida. The results showed significant (p < 0.001) decline in pH (13.17%), TOC (21.70%), C: N (62.53%) and C: P (57.66%) ratios, whilst total N (108.9%), P (84.89%) and K (21.85%) content increased (p < 0.001) in matured vermicompost. Different enzymatic activities declined during termination phase of vermicomposting experiment with maximum decrease of 41.72 (p = 0.002) and 39.56% (p = 0.001) in protease and β-glucosidase, respectively. FT-IR, TGA, DSC and SEM studies suggested that final vermicompost was more stabilized as compared to initial waste mixture, characterized by reduced levels of aliphatic materials, carbohydrates and increase in aromatic groups possibly due to biosynthesis of humic substances. Both, the conventional (physicochemical and enzyme activity) and advanced techniques depict maturity and stability of the ready vermicompost. However, FT-IR, TGA, DSC and SEM were proved to be more promising, fast and reliable techniques over conventional analyses.

Original languageEnglish
Article number109914
JournalJournal of Environmental Management
Volume255
Early online date3 Dec 2019
DOIs
Publication statusPrint publication - 1 Feb 2020
Externally publishedYes

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Bibliographical note

Copyright © 2019. Published by Elsevier Ltd.

Keywords

  • Differential scanning calorimetry (DSC)
  • Eisenia fetida
  • Municipal solid waste (MSW)
  • Spectroscopy
  • Thermogravimetry (TG)
  • Vermicompost

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