Abstract
Heavy metals contaminated sediment has become a worldwide environmental issue due to its great harm to human and aquatic organisms. Thus, economical, effective, and environmentally-friendly remediation technologies are urgently needed. Among which, combined remediation technologies have attracted widespread attention for their unique advantages. This paper introduces combined remediation technologies based on physical-, chemical-, and bio-remediation of heavy metal polluted sediments. Firstly, the research progress in physical-chemical, bio-chemical, and inter-organismal (including plants, animals, microorganisms) remediation of heavy metal polluted sediments are summarized. Additionally, the paper analyzes the problems of the process of combined remediation of heavy metals in river sediments and outlooks the future development trends of remediation technologies. Overall, this review provides useful technology references for the control and treatment of heavy metal pollution in river sediments.
Highlights
Heavy metals entering water bodies will be accumulated in the riverbed surface sediment through adsorption, complexation, precipitation, etc
This paper summarizes the research progress in combined remediation technology of heavy metal pollution in river sediment
Xie et al [7] researched the effect of cathodic pH on the remediation efficiency of heavy metal polluted sediment by acidized-Electrokinetic remediation (EKR) combined remediation technology
Summary
Heavy metals entering water bodies will be accumulated in the riverbed surface sediment through adsorption, complexation, precipitation, etc. (1) eliminate or reduce the environmental toxicity of heavy metals in the sediment; (2) transform the polluted sediment into harmless substances; and (3) isolate and remove the polluted sediment from the water body. Solving these core problems is of great importance to achieve better treatment and control of the polluted sediment and fine purification of river ecology. This paper summarizes the research progress in combined remediation technology of heavy metal pollution in river sediment. Res. Public Health 2019, 16, 5098 emerging in recent years in the aim of providing references for the development and application of heavy metal polluted sediment remediation
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