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

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:255

Article

Srivastava, Vaibhav¹  Goel, Gaurav²  Thakur, Vijay Kumar²  Singh, Rajeev Pratap¹  Ferreira de Araujo, Ademir Sergio³  Singh, Pooja⁴ 

[1] Banaras Hindu Univ, Inst Environm & Sustainable Dev, Dept Environm & Sustainable Dev, Varanasi 221005, Uttar Pradesh, India

[2] Cranfield Univ, Sch Aerosp Transport & Mfg, Cranfield, Beds, England

[3] Univ Fed Piaui, Agr Sci Ctr, Teresina, PI, Brazil

[4] SHEPA, Dept Sci, Inst Comp Sci & Technol, Varanasi, Uttar Pradesh, India

关键词: Municipal solid waste (MSW);    Vermicompost;    Eisenia fetida;    Spectroscopy;    Thermogravimetry (TG);    Differential scanning calorimetry (DSC);   

DOI  :  10.1016/j.jenvman.2019.109914

来源: Elsevier

【 摘 要 】

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 beta-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.

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