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Remediation of Contaminated Land

Remediation of Contaminated Land. Introduction Engineering Methods Biological methods Physical/ Chemical/ Thermal. Contaminated Land Remediation References. http://www.staff.ncl.ac.uk/p.j.sallis/ USER/PASSWORD = cassie Policy and Legal

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Remediation of Contaminated Land

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  1. Remediation of Contaminated Land • Introduction • Engineering Methods • Biological methods • Physical/ Chemical/ Thermal

  2. Contaminated Land Remediation References http://www.staff.ncl.ac.uk/p.j.sallis/USER/PASSWORD = cassie • Policy and Legal • Converging Policy Approaches to Contaminated land - Paul Steadman (see copy at http://www.staff.ncl.ac.uk/p.j.sallis/teach.html) • http://www.environment-agency.gov.uk/gwcl/LC_Policy.htm • Contaminated Land -Tom Graham • Contaminated Land - Stephen Tromans & R Turrall-Clarke • Remediation • Reclamation of contaminated land Paul C Nathanail (2004) • Selection of remedial treatments for Contaminated Land D Rudland (2004) • Geoenvironmental Engineering H Sharma & KR Reddy (2004) • Natural & enhanced remediation systems S Suthersan (2002) • Remedial processes for contaminated land DEvans (2001) • Remediation engineering of contaminated soilsDonald L. Wise (2000) • Contaminated Land - Tom Cairney (1998) • Full Scale Treatment Technologies for the Remediation of Contaminated Land - Ian Martin & Paul Bardos 628.55 MAR • Several Publications by Robert E. Hinchee • US EPA site http://www.frtr.gov/matrix2/section1/toc.html#Sec4

  3. Remediation Strategy Conceptual model and the “Pollutant Linkage” • Source • permanent reduction of risks • numerous technical approaches • Pathway • risks managed in short to medium term • several different engineering approaches • Target • not usually applicable or practicable

  4. Remediation Technologies non-technical high technology • Soil Disposal Off-Site • Excavation, Landfill • Containment • Capping, Barriers • Restructuring • Redistribution and Dilution of Material • Contaminant Stabilisation, Removal and Destruction • Numerous Biological, Physical, Chemical, Thermal Methods Relatively low cost, and simple. Considerable experience. Expensive, complex, Emerging Technologies

  5. Remediation Technologies • In-Situ Treatment without physically removing the soil • Advantage - less disturbance, emissions, buildings, buried services • Disadvantage - out of sight, monitoring, heterogeneity of contamination, soil structure (occluded clay lenses), mass transfer limitations, toxic hot-spots. • Ex-Situ Treatment after physical removal of soil • Advantage - Mixing distributes contaminants, mass transfer, process control, treat graded fractions, representative sampling, improved rate, protects groundwater. • Disadvantage - more work, space requirement, emissions, avoid buried services, aesthetic appearance

  6. Remediation Technologies • Intensive Process • Aim to achieve a rapid rate of remediation • uses complex equipment • consume considerable resources • power, reactants, labour, monitoring • Generally detrimental to soil structure • Examples - Soil Washing, Solidification & Stabilisation, Incineration • Extensive Process • Slower to Work • Low capital and Maintenance Costs • Soil Structure retained (Improved) • Examples - Phytoremediation, Bioremediation

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