Author:
Mwandira Wilson,Nakashima Kazunori,Kawasaki Satoru,Arabelo Allison,Banda Kawawa,Nyambe Imasiku,Chirwa Meki,Ito Mayumi,Sato Tsutomu,Igarashi Toshifumi,Nakata Hokuto,Nakayama Shouta,Ishizuka Mayumi
Abstract
AbstractThe present study investigated biosorption of Pb (II) and Zn (II) using a heavy metal tolerant bacterium Oceanobacillus profundus KBZ 3-2 isolated from a contaminated site. The effects of process parameters such as effect on bacterial growth, pH and initial lead ion concentration were studied. The results showed that the maximum removal percentage for Pb (II) was 97% at an initial concentration of 50 mg/L whereas maximum removal percentage for Zn (II) was at 54% at an initial concentration of 2 mg/L obtained at pH 6 and 30 °C. The isolated bacteria were found to sequester both Pb (II) and Zn (II) in the extracellular polymeric substance (EPS). The EPS facilitates ion exchange and metal chelation-complexation by virtue of the existence of ionizable functional groups such as carboxyl, sulfate, and phosphate present in the protein and polysaccharides. Therefore, the use of indigenous bacteria in the remediation of contaminated water is an eco-friendly way of solving anthropogenic contamination.
Funder
Japan Society for the Promotion of Science
Science and Technology Research Partnership for Sustainable Development
JST aXis
Publisher
Springer Science and Business Media LLC
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