Epigenetic regulations enhance adaptability and valorization efficiency in Eisenia fetida and Eudrilus eugeniae during vermicomposting of textile sludge: Insights on repair mechanisms of metal-induced genetic damage and oxidative stress. (February 2022)

• Record Type: Journal Article
• Authors: Paul, Sarmistha; Goswami, Linee; Pegu, Ratul; Kumar Chatterjee, Subhendu; Sundar Bhattacharya, Satya
• Is Part Of: Bioresource technology. Volume 345(2022)
• Publication Date: 2022-02
• Subjects: Textile sludge -- Earthworm -- Metal accumulation -- Genotoxicity -- Epigenetic stress regulation; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2021.126493
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Metal-rich textile sludge induced oxidative stress and DNA-damage in earthworms. Earthworms restore genetic integrity through epigenetic regulations in vermibeds. Cotton sludge induced greater toxicity than silk processing sludge to earthworms. Eisenia was a healthier choice than Eudrilus for valorization of textile sludge. Proportion of cow dung in the feedstock is vital for vermiremediation of sludge. Abstract: Genotoxicity-based assessments of vermitechnology for textile-sludge valorization have rarely been attempted. Therefore, waste sanitization and epigenetic stress-regulation efficiency of Eisenia fetida and Eudrilus eugeniae were evaluated in silk (DSPS) and cotton (CPWS) processing sludge-based vermibeds. Vermicomposting resulted in greater C, N, and P recovery than composting. Earthworm population reduced by 6–50% in DSPS/CPWS, while it significantly increased in cow dung (CD) mixed DSPS/CPWS. The Cr, Cd, Pb, and Zn accumulation efficiency of earthworms was higher in DSPS-based feedstocks than CPWS. However, metal-rich sludge elevated oxidative stress, causing greater inhibition of cell viability and DNA damage in Eudrilus than in Eisenia . Although histo-architecture of chloragogenous tissues was perturbed, earthworms combatted metal-induced lipid peroxidation via the activation of catalase, superoxide-dismutase, and reduced-glutathione. Correlation statistics revealed that genetic integrity in earthworms was restored through DNA-methyltransferase activity, especially in DSPS/CPWS + CD vermibeds. Overall, Eisenia was a healthier choice than Eudrilus for sustainable valorization of textile-sludge.