Journal ArticleDOI
Review of remediation technologies for sediments contaminated by heavy metals
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TLDR
A review of the existing literature on sediment remediation techniques and developments in the fields of environmental science and engineering, attempting to provide a better understanding of the advances of remedy techniques and new research directions for sediments contaminated by heavy metals is presented in this paper.Abstract:
Contamination of sediments with heavy metals (HMs) is a worldwide environmental issue, due to the negative ecological effects of HMs. Sediments are an important component of aquatic ecosystems, impacting the transformation and transfer of HMs in the environment. Thus, remediating sediments polluted by HMs is a crucial activity within the full aquatic ecosystem remediation process, and economical, effective, and environmentally friendly remediation techniques are urgently needed. We reviewed the existing literature on sediment remediation techniques and developments in the fields of environmental science and engineering, attempting to provide a better understanding of the advances of remediation techniques and new research directions for sediments contaminated by HMs. This review summarized remediation methods (e.g., physical–chemical strategies, biological strategies, and combined techniques) used to treat sediments contaminated with HMs. This included analyzing the mechanisms associated with biological remediation technologies and their combination with other methods. Then, the review summarized the factors influencing the selection of remediation methods and evaluated the prospects of new emerging remediation methods. Bioimmobilization techniques (e.g., phytostabilization and microorganism immobilization) have received increased attention because of their low remediation cost and environmental compatibility. Furthermore, particular attention has been paid to explore the role of sulfate-reducing bacteria in decreasing heavy metal mobility. The review provides a useful theoretical foundation and technology reference for the remediation of sediment polluted by HMs.read more
Citations
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Journal ArticleDOI
Assessment of heavy metal pollution from anthropogenic activities and remediation strategies: A review.
TL;DR: The concentration of heavy metals in several sites, assessed in water, soil and sediment samples, affected by different pollution sources are reviewed, showing how human activities impact natural media and how the pollution spreads.
Journal ArticleDOI
Plant-lead interactions: Transport, toxicity, tolerance, and detoxification mechanisms.
TL;DR: The important functions of different antioxidants in plants during Pb stress have been reviewed and tolerance responses and detoxification mechanisms in the plant through the regulation of gene expression, and glutathione and protein metabolisms to compete against Pb-induced phytotoxicity are reviewed.
Journal ArticleDOI
Utilization of nanomaterials for in-situ remediation of heavy metal(loid) contaminated sediments: A review
TL;DR: This review summarizes recent studies that have used various nanomaterials such as nanoscale zero-valent iron (nZVI), stabilizer-modified nZVI, nano apatite based-materials including nano-hydroxyapatite particles (nHAp), carbon nanotubes (CNTs), and titanium dioxide nanoparticles (TiO2 NPs) for the remediation of heavy metal(loid) contaminated sediments.
Journal ArticleDOI
Biofuel Production Using Thermochemical Conversion of Heavy Metal-Contaminated Biomass (HMCB) Harvested from Phytoextraction Process
TL;DR: In this paper, a review of recent literature on sustainable phytoextraction of heavy metals from polluted soils is presented, and the possibility of the cost-efficient production of metal-free biofuels from contaminated plants and energy crops using thermochemical processes (pyrolysis, gasification, combustion, and liquefaction) has been scrutinized.
Journal ArticleDOI
Remediation of heavy metal contaminated soils by organic acid extraction and electrochemical adsorption.
TL;DR: Low-molecular-weight organic acids were used to extract Cu and Zn from polluted soils, and the extracted heavy metals were subsequently adsorbed by activated carbon electrodes, proposing a facile method for heavy metal removal from contaminated soils.
References
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The Challenge of Micropollutants in Aquatic Systems
René P. Schwarzenbach,Beate I. Escher,Kathrin Fenner,Thomas B. Hofstetter,C. Annette Johnson,Urs von Gunten,Bernhard Wehrli +6 more
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TL;DR: It was concluded that the consensus-based SQGs provide a reliable basis for assessing sediment quality conditions in freshwater ecosystems.
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Phytoremediation of heavy metals—Concepts and applications
TL;DR: This review article comprehensively discusses the background, concepts and future trends in phytoremediation of heavy metals.
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Microbial heavy-metal resistance
TL;DR: This review describes the workings of known metal-resistance systems in microorganisms and the transport of the 17 most important (heavy metal) elements is compared.
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Going back to the roots: the microbial ecology of the rhizosphere.
TL;DR: Recent developments in rhizosphere research are discussed in relation to assessing the contribution of the micro- and macroflora to sustainable agriculture, nature conservation, the development of bio-energy crops and the mitigation of climate change.