|
1
|
Cuaxinque-Flores G, Aguirre-Noyola JL, Hernández-Flores G, Martínez-Romero E, Romero-Ramírez Y, Talavera-Mendoza O. Bioimmobilization of toxic metals by precipitation of carbonates using Sporosarcina luteola: An in vitro study and application to sulfide-bearing tailings. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 724:138124. [PMID: 32268286 DOI: 10.1016/j.scitotenv.2020.138124] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 03/17/2020] [Accepted: 03/20/2020] [Indexed: 06/11/2023]
Abstract
Metal release from mining wastes is a major environmental problem affecting ecosystems that requires effective, low-cost strategies for prevention and reclamation. The capacity of two strains (UB3 and UB5) of Sporosarcina luteola was investigated to induce the sequestration of metals by precipitation of carbonates in vitro and under microcosm conditions. These strains carry the ureC gene and have high urease activity. Also, they are highly resistant to metals and have the capacity for producing metallophores and arsenophores. SEM, EDX and XRD reveal that the two strains induced precipitation of calcite, vaterite and magnesian calcite as well as several (M2+)CO3 such as hydromagnesite (Mg2+), rhodochrosite (Mn2+), cerussite (Pb2+), otavite (Cd2+), strontianite (Sr2+), witherite (Ba2+) and hydrozincite (Zn2+) in vitro. Inoculation of the mixed culture of UB3+UB5 in tailings increased the pH and induced the precipitation of vaterite, calcite and smithsonite enhancing biocementation and reducing pore size and permeability slowing down the oxidation of residual sulfides. Results further demonstrated that the strains of S. luteola immobilize bioavailable toxic elements through the precipitation and coprecipitation of thermodynamically stable (M2+)CO3, Fe-Mn oxyhydroxides and organic chelates.
Collapse
Affiliation(s)
- Gustavo Cuaxinque-Flores
- Maestría en Recursos Naturales y Ecología, Facultad de Ecología Marina, Universidad Autónoma de Guerrero, Gran vía tropical 20, Fraccionamiento Las playas, Acapulco de Juárez, Guerrero, Mexico
| | - José Luis Aguirre-Noyola
- Programa de Ecología Genómica, Centro de Ciencias Genómicas, Universidad Nacional Autónoma de México, Av. Universidad s/n, Chamilpa, 62210 Cuernavaca, Morelos, Mexico
| | - Giovanni Hernández-Flores
- CONACyT-Universidad Autónoma de Guerrero, Escuela Superior de Ciencias de la Tierra, Ex hacienda San Juan Bautista s/n, Taxco el Viejo, Guerrero C.P. 40323, Mexico
| | - Esperanza Martínez-Romero
- Programa de Ecología Genómica, Centro de Ciencias Genómicas, Universidad Nacional Autónoma de México, Av. Universidad s/n, Chamilpa, 62210 Cuernavaca, Morelos, Mexico
| | - Yanet Romero-Ramírez
- Facultad de Ciencias Químico Biológicas, Universidad Autónoma de Guerrero, Av Lázaro Cárdenas, Ciudad Universitaria, 39070 Chilpancingo, Guerrero, Mexico
| | - Oscar Talavera-Mendoza
- Maestría en Recursos Naturales y Ecología, Facultad de Ecología Marina, Universidad Autónoma de Guerrero, Gran vía tropical 20, Fraccionamiento Las playas, Acapulco de Juárez, Guerrero, Mexico; Escuela Superior de Ciencias de la Tierra, Universidad Autónoma de Guerrero, Ex-hacienda San Juan Bautista s/n, C.P. 40323 Taxco el Viejo, Guerrero, Mexico.
| |
Collapse
|