Efficacy of biocementation of lead mine waste from the Kabwe Mine site evaluated using Pararhodobacter sp.

Journal article

Mwandira, W., Nakashima. K., Kawasaki, s., Ito, M., Sato, T., Igarashi, T., Banda, K., Chirwa, M., Nyambe, I., Nakayama, N. and Ishizuka, M. (2019). Efficacy of biocementation of lead mine waste from the Kabwe Mine site evaluated using Pararhodobacter sp. Environmental Science and Pollution Research. 26, pp. 15653-15664. https://doi.org/10.1007/s11356-019-04984-8
AuthorsMwandira, W., Nakashima. K., Kawasaki, s., Ito, M., Sato, T., Igarashi, T., Banda, K., Chirwa, M., Nyambe, I., Nakayama, N. and Ishizuka, M.
Abstract

Biocementation of hazardous waste is used in reducing the mobility of contaminants, but studies on evaluating its efficacy have not been well documented. Therefore, to evaluate the efficacy of this method, physicochemical factors affecting stabilized hazardous products of in situ microbially induced calcium carbonate precipitation (MICP) were determined. The strength and leach resistance were investigated using the bacterium Pararhodobacter sp. Pb-contaminated kiln slag (KS) and leach plant residue (LPR) collected from Kabwe, Zambia, were investigated. Biocemented KS and KS/LPR had leachate Pb concentrations below the detection limit of < 0.001 mg/L, resisted slaking, and had maximum unconfined compressive strengths of 8 MPa for
KS and 4 MPa for KS/LPR. Furthermore, biocemented KS and KS/LPR exhibited lower water absorption coefficient values,
which could potentially reduce the water transportation of Pb2+. The results of this study show that MICP can reduce Pb2+ mobility in mine wastes. The improved physicochemical properties of the biocemented materials, therefore, indicates that this technique is an effective tool in stabilizing hazardous mine wastes and, consequently, preventing water and soil contamination.

KeywordsAbandoned mine, Solidification, Leaching, Strength, Efficacy
Year2019
JournalEnvironmental Science and Pollution Research
Journal citation26, pp. 15653-15664
PublisherSpringer
ISSN0944-1344
Digital Object Identifier (DOI)https://doi.org/10.1007/s11356-019-04984-8
Web address (URL)https://link.springer.com/article/10.1007/s11356-019-04984-8#citeas
Publication dates
Print04 Apr 2019
Publication process dates
Accepted25 Mar 2019
Deposited13 May 2022
Accepted author manuscript
License
File Access Level
Open
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