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Table of contents
Chapter 1. Literature Review
1.1 Contamination in soils and sediments by improper disposal of e-waste
1.1.1 Hazard and harm
1.1.2 Soil and sediment contamination by improper disposal of e-waste
1.2 PCBs in soils and sediments
1.2.1 Chemical and physical properties of PCBs
1.2.2 Toxicity and bioaccumulation of PCBs
1.2.3 Environmental behavior of PCBs in soils and sediments
1.2.4 Contamination by PCBs in soils and sediments
1.3 Remediation trials on e-waste contaminated soils and complex co-contaminated soils
1.3.1 Phytoremediation
1.3.2 Physico-chemical remediation
1.3.3 Removal of multiple contaminants by soil washing
1.4 Zerovalent iron (ZVI) mediated reduction
1.4.1 Factors influencing ZVI degradation
1.4.2 Mechanisms of halogenated hydrocarbon degradation by zerovalent iron
1.4.3 Application of ZVI degradation in remediation
1.5 Conclusions
Chapter 2. Soil contamination by polychlorinated biphenyls in e-waste recycling sites in south China
2.2 Experimental
2.2.1 Studied areas and sample collection
2.2.2 Characterization of soil samples
2.2.3 Analysis of heavy metals
2.2.4 Analysis of PCBs and QA/QC
2.3 Results and discussion
2.3.1 Properties of sampled soils
2.3.2 PCB contaminations
2.3.3 Metal contaminations
2.4 Conclusions
Chapter 3. The effect of Tween-80, humic acid and metal ions on the dechlorination of PCBs by ZVI
3.1 Introduction
3.2 Experimental
3.2.1 Chemicals
3.2.2 Dechlorination experiments
3.2.3 PCBs extraction and detection
3.2.4 Data analysis
3.3 Results and discussion
3.3.1 Kinetics
3.3.2 Dechlorination pathway
3.4 Conclusions
Chapter 4. Factors and processes influencing dechlorination of PCBs by ZVI in aqueous solution
4.1 Introduction
4.2 Experimental
4.2.1 Chemicals
4.2.2 Orthogonal experiments
4.2.3 Extraction and detection of PCB-52
4.2.4 Surfactant detection
4.2.5 Characterizations of ZVI
4.3 Results and discussion
4.3.1 Mass transfer
4.3.2 Iron oxidation
4.4 Conclusions
4.5 Supplementary Information
4.5.1 Data analysis
4.5.2 SEM-EDX
4.5.3 CMC of Envirosurf
Chapter 5. Surfactant-assisted PCBs reduction by ZVI in contaminated sediment
5.1 Introduction
5.2 Experimental
5.2.1 Chemicals
5.2.2 Contaminated sediment
5.2.3 Batch experiments of approach A
5.2.4 Batch experiments of approach B
5.2.5 Analysis and characterization
5.3 Results and discussions
5.3.1 Approach A
5.3.2 Approach B
5.4 Conclusions
5.5 Supplementary Information
5.5.1 Desorption kinetics
5.5.2 Details of contaminated sediments
Chapter 6. Environmental Implications, conclusions and perspectives
6.1 Environmental implications
6.1.1 The issue
6.1.2 Feasibility
6.1.3 Lab-scale application
6.2 Conclusions
6.3 Deficiencies and perspectives
Résumé étendu en français
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