The remediation of heavy metals contaminated sediment

Heavy metal contamination has become a worldwide problem through disturbing the normal functions of rivers and lakes. Sediment, as the largest storage and resources of heavy metal, plays a rather important role in metal transformations. This paper provides a review on the geochemical forms, affectin...

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Bibliographic Details
Published in:Journal of hazardous materials 2009-01, Vol.161 (2), p.633-640
Main Authors: Peng, Jian-feng, Song, Yong-hui, Yuan, Peng, Cui, Xiao-yu, Qiu, Guang-lei
Format: Article
Language:English
Subjects:
Applied sciences
Biodegradation, Environmental
Chemistry - methods
Continental surface waters
Distribution
Electrochemistry - methods
Exact sciences and technology
General treatment and storage processes
Geologic Sediments
Geology - methods
Heavy metal
Hydrogen-Ion Concentration
In situ and ex situ remediation
Influence factors
Metals - chemistry
Metals, Heavy - analysis
Metals, Heavy - chemistry
Models, Chemical
Natural water pollution
Pollution
Sediment
Silicon Dioxide
Soil Pollutants - chemistry
Ultrasonics
Wastes
Water treatment and pollution
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Summary:Heavy metal contamination has become a worldwide problem through disturbing the normal functions of rivers and lakes. Sediment, as the largest storage and resources of heavy metal, plays a rather important role in metal transformations. This paper provides a review on the geochemical forms, affecting factors and remediation technologies of heavy metal in sediment. The in situ remediation of sediment aims at increasing the stabilization of some metals such as the mobile and the exchangeable fractions; whereas, the ex situ remediation mainly aims at removing those potentially mobile metals, such as the Mn-oxides and the organic matter (OM) fraction. The pH and OM can directly change metals distribution in sediment; however oxidation–reduction potential (ORP), mainly through changing the pH values, indirectly alters metals distribution. Mainly ascribed to their simple operation mode, low costs and fast remediation effects, in situ remediation technologies, especially being fit for slight pollution sediment, are applied widely. However, for avoiding metal secondary pollution from sediment release, ex situ remediation should be the hot point in future research.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2008.04.061