Bioleaching of heavy metals from harbor sediment using sulfur-oxidizing microflora acclimated from native sediment and exogenous soil

doi:10.1007/s11356-019-04137-x

CNU IR > College of Sustainable Environment and Recreation > Dept. of Environmental Engineering and Science (including master's program) > Periodical Articles > Item 310902800/32525

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Title:	Bioleaching of heavy metals from harbor sediment using sulfur-oxidizing microflora acclimated from native sediment and exogenous soil
Authors:	Chia-Yuan Chang(張家源) Chen, Shen-Yi Klipkhayai, Phakchira Chiemchaisri, Chart
Contributors:	Chia Nan Univ Pharm & Sci, Dept Environm Engn & Sci Natl Kaohsiung Univ Sci & Technol, Dept Safety Hlth & Environm Engn, 1 Univ Rd Kasetsart Univ, Fac Engn, Dept Environm Engn
Keywords:	Bioleaching Bioremediation Harbor sediment Heavy metal Inoculants Speciation
Date:	2019-03
Issue Date:	2020-07-29 13:48:31 (UTC+8)
Publisher:	SPRINGER HEIDELBERG
Abstract:	The harbor sediment containing high concentration of heavy metals may pose serious impacts on the marine ecosystem and environmental quality. The bioleaching process has been considered as an environmentally friendly and cost-effective alternative for removing heavy metals from contaminated sediments. In this study, a series of experiments were performed to investigate the feasibility of bioleaching process for removing heavy metals from the contaminated harbor sediments. The performance of the bioleaching process inoculated with sulfur-oxidizing microflora acclimated from the native harbor sediment was compared with that acclimated from the exogenous soil. In the bioleaching experiment with inoculants from native sediment, the efficiency of Zn, Cu, Cr, Pb, and Ni (30days) reached 39-100%, 21-94%, 8-63%, 5-74%, and 19-77%, respectively. While 59-100% of Zn, 22-100% of Cu, 0-95% of Cr, 0-100% of Pb, and 22-100% of Ni were respectively removed in the bioleaching experiment with inoculants from exogenous soil after 30days of reaction time. The results show that the rate and efficiency of metal removal in the bioleaching process decreased with an increase of sediment solid content from 10 to 40g/L. The efficiency of metal removal in the bioleaching process with inoculants from the native sediment was lower than those from the exogenous soil due to the bacterial activity. By the fractionation of metal in the harbor sediment, exchangeable, carbonate-bound, and Fe/Mn oxide-bound metals (mobile fractions) were found to be apparently reduced and even organic matter/sulfide-bound and residual metals (stable fractions) were slightly removed after the bioleaching experiment.
Relation:	Environmental Science and Pollution Research, v.26, n.7, pp.6818-6828
Appears in Collections:	[Dept. of Environmental Engineering and Science (including master's program)] Periodical Articles

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