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METHODS FOR ACTIVATED CARBON-BASED SEDIMENT REMEDIATION: APPLICABILITY, REMEDIATION POTENTIAL AND ADVERSE EFFECTS OF CONVENTIONAL AND NOVEL SORBENT MATERIALS UNDER FIELD AND LABORATORY CONDITIONS
Abel, S., Ph.D. dissertation, University of Eastern Finland, 61 pp, 2019

This thesis studied different activated carbon (AC) amendments for their remediation efficiency and adverse effects to allow a balanced view of the potential and risks of the method. A 14-month pilot-scale field study was conducted in a hydrophobic organic contaminant (PCB)-contaminated lake in Finland and complemented by laboratory trials. Field study results revealed several shortcomings of AC-based sediment remediation, including poor retention of the AC cap on site and ongoing recontamination with sediment from adjacent, untreated sites during storm events. A novel, low-buoyancy AC-based material (ACC-G) was developed to improve the sorbent's applicability from the water surface and increase its resistance to water turbulence. Initial laboratory tests showed high contaminant-binding capabilities of the novel material. Adverse effects were reduced compared to powdered ACs by granulating the ACC-G. This prevents the ingestion of AC particles by organisms, which has been suggested to be one of the major causes of AC-induced adverse effects. http://epublications.uef.fi/pub/urn_isbn_978-952-61-3001-9/urn_isbn_978-952-61-3001-9.pdf



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