Solidification of sand by Pb(II)-tolerant bacteria for capping mine waste to control metallic dust: Case of the abandoned Kabwe Mine, Zambia

Journal article

Mwandira, W., Nakashima. K., Kawasaki, S., Ito, M., Sato, T., Igarashi, T., Banda, K., Chirwa, M., Nyambe, I., Nakayama, N., Hakuto, N. and Ishizuka, M. (2019). Solidification of sand by Pb(II)-tolerant bacteria for capping mine waste to control metallic dust: Case of the abandoned Kabwe Mine, Zambia. Chemosphere. 228, pp. 17-25. https://doi.org/10.1016/j.chemosphere.2019.04.107
AuthorsMwandira, W., Nakashima. K., Kawasaki, S., Ito, M., Sato, T., Igarashi, T., Banda, K., Chirwa, M., Nyambe, I., Nakayama, N., Hakuto, N. and Ishizuka, M.
Abstract

Environmental impacts resulting from historic lead and zinc mining in Kabwe, Zambia affect human health due to the dust generated from the mine waste that contains lead, a known hazardous pollutant. We employed microbially induced calcium carbonate precipitation (MICP), an alternative capping
method, to prevent dust generation and reduce the mobility of contaminants. Pb-resistant Oceanobacillus profundus KBZ 1-3 and O. profundus KBZ 2e5 isolated from Kabwe were used to biocement the sand that would act as a cover to prevent dust and water infiltration. Sand biocemented by KBZ 1-3 and KBZ 2-5 had maximum unconfined compressive strength values of 3.2 MPa and 5.5MPa, respectively. Additionally, biocemented sand exhibited reduced water permeability values of 9.6*10e-8 m/s
and 8.9x1010e-8 m/s for O. profundus KBZ 1-3 and KBZ 2-5, respectively, which could potentially limit the entrance of water and oxygen into the dump, hence reducing the leaching of heavy metals. We propose that these isolates represent an option for bioremediating contaminated waste by preventing
both metallic dust from becoming airborne and rainwater from infiltrating into the waste. O. profundus KBZ 1-3 and O. profundus KBZ 2-5 isolated form Kabwe represent a novel species that has, for the first time, been applied in a bioremediation study.

KeywordsKabwe, Mine waste, Capping Indigenous ureolytic bacteria, Biocementation
Year2019
JournalChemosphere
Journal citation228, pp. 17-25
PublisherElsevier
ISSN0045-6535
Digital Object Identifier (DOI)https://doi.org/10.1016/j.chemosphere.2019.04.107
Web address (URL)https://www.sciencedirect.com/science/article/pii/S004565351930760X
Publication dates
Print14 Apr 2019
Publication process dates
Accepted16 Apr 2019
Deposited13 May 2022
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