| Texto completo | |
| Autor(es): |
Viana, Douglas Gomes
;
Alleoni, Luis Reynaldo Ferracciu
;
Regitano, Jussara Borges
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING; v. 13, n. 5, p. 9-pg., 2025-10-01. |
| Resumo | |
Barite (BaSO42-), widely used as a drilling additive in oil and gas industry, poses contamination risks in wetlands. In these environments, sulfate reduction couples with organic matter oxidation affecting Ba mobility. We investigated how organic residues [sewage sludge (SS), peat (PT), or rice straw (RS)] and their application rates [0, 1, 5, and 15 % C] affect barite dissolution and Ba availability in a wetland soil incubated for 120 days. SS, rich in water-soluble organic carbon (WSOC) and with low C/N, rapidly induced anoxic conditions, favoring barite reductive dissolution but subsequent Ba immobilization as sulfide minerals; RS, having much higher C/N (> 50) and lower WSOC, promoted Ba mobilization through carbonate dissolution under more oxidizing conditions; and PT delayed redox transitions, limiting Ba-sulfide formation. Soil pH and Eh, dictated by residue quality, consistently explained Ba distribution across soluble, exchangeable, carbonate-, and sulfide-bound fractions, corroborated by PCA. Overall, SS at 5 % C is a promising strategy for Ba immobilization, provided drainage is carefully managed to avoid remobilization, whereas RS at 1 % C shows potential for assisted phytoextraction. Organic residue amendments thus offer flexible tools to regulate Ba availability in barite-impacted flooded soils, aligning remediation efficiency with residue valorization. Their success, however, depends on context-specific strategies that integrate amendment chemistry, local residue availability, economic feasibility, hydrological management, and the use of complementary approaches such as phytoremediation. (AU) | |
| Processo FAPESP: | 19/22280-1 - Efeito da aplicação de oxihidróxidos de Mn na redução da barita (BaSO4) e disponibilidade de Ba em solo anóxico |
| Beneficiário: | Douglas Gomes Viana |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado |
| Processo FAPESP: | 19/02796-3 - Efeitos da matéria orgânica e da estrutura da comunidade microbiana na disponibilidade e fitorremediação de BA (barita) em solos alagados |
| Beneficiário: | Douglas Gomes Viana |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |