Urban sewage sludge stabilization by alkalization-composting-vermicomposting process: Crop-livestock residue use.

Autor: Floriano da Silva LC; Catholic University Dom Bosco (UCDB), Campo Grande, Brazil., Vinhas Ítavo LC; College of Veterinary Medicine and Animal Science (FAMEZ), Federal University of Mato Grosso do Sul (UFMS), Campo Grande, Brazil., Martins Santos R; Catholic University Dom Bosco (UCDB), Campo Grande, Brazil., Brandão Ferreira Ítavo CC; College of Veterinary Medicine and Animal Science (FAMEZ), Federal University of Mato Grosso do Sul (UFMS), Campo Grande, Brazil., Zirondi Longhini V; College of Veterinary Medicine and Animal Science (FAMEZ), Federal University of Mato Grosso do Sul (UFMS), Campo Grande, Brazil., Menezes Dias A; College of Veterinary Medicine and Animal Science (FAMEZ), Federal University of Mato Grosso do Sul (UFMS), Campo Grande, Brazil., Dos Santos Difante G; College of Veterinary Medicine and Animal Science (FAMEZ), Federal University of Mato Grosso do Sul (UFMS), Campo Grande, Brazil., Moreira Arcanjo AH; College of Veterinary Medicine and Animal Science (FAMEZ), Federal University of Mato Grosso do Sul (UFMS), Campo Grande, Brazil., Santos Santana JC; College of Veterinary Medicine and Animal Science (FAMEZ), Federal University of Mato Grosso do Sul (UFMS), Campo Grande, Brazil., Gurgel ALC; Campus Professora Cinobelina Elvas (CPCE), Universidade Federal do Piauí (UFPI), Bom Jesus, Brasil., de Oliveira Scarpino van Cleef F; Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, Brazil.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2023 Sep 07; Vol. 18 (9), pp. e0289362. Date of Electronic Publication: 2023 Sep 07 (Print Publication: 2023).
DOI: 10.1371/journal.pone.0289362
Abstrakt: Waste management practices are vital for human health and the environment in a world where natural resources stress is expected to increase with the growth of population. Our study aimed to evaluate the potential use of crop-livestock residue as a bulking agent associated with the ideal level of hydrated lime for the stabilization and sanitization of urban sewage sludge through the alkalization-composting process. Therefore, we determined the alkalization efficiency on the heavy metal concentration in urban sewage sludge, quantified the viable eggs of helminths in pure and alkalized sludge, and measured the rate of earthworms (Eisenia fetida) surviving in the vermicomposting process using different levels of alkalized urban sewage sludge associated with crop-livestock residue. Four sequential trials were carried out in a completely randomized design with three replicates. The lime alkalization reduced the levels of Ba, As, Pb, Cu, Cr, Mo, Ni, and Zn compared to the pure urban sewage sludge. Using 30% w/w of lime in the urban sewage sludge (SS-30) for composting process reduced the viable helminth eggs by 71, 72, and 69% for sugarcane bagasse (Saccharum officinarum; SB), fresh chopped Napier-grass (Pennisetum purpureum; NG), and bovine ruminal content (BR), respectively. The ideal level of hydrated lime for stabilization and sanitization of urban sewage sludge was found to be 30%, which was able to reduce the heavy metals. The residues have the potential as a bulking agent for the composting of urban sewage sludge when associated with alkalization. The lime alkalization decreases the total number of helminth eggs and the number of viable eggs. The possibility of starting a vermicomposting using the mixtures is promising, evidenced by the earthworm survival in composting urban sewage sludge mixed with crop-livestock residues after 45 days of composting. The earthworm survival is maintained by an association of at least 80% of the crop-livestock residues.
Competing Interests: The authors declared that there are no conflicting interests.
(Copyright: © 2023 Floriano da Silva et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
Databáze: MEDLINE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje