Electrodialytic remediation of sediments

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Abstract

Sediments of harbors and freshwaters are regularly dredged for various reasons: maintenance of navigational depths, recovery of recreational locations, and even environmental recovery. In the past, sediments dredged from harbors have been dumped at sea, however, environmental regulations now, in many cases, prohibit this due to contamination by primarily heavy metals and TBT. Similarly, sediments of fresh waters could potentially be used as soil amendment material for poor agricultural soils utilizing their often high content of phosphate and nitrogen. However, again, heavy metal contamination often hinders this usage. Hence, for both types of sediments, expensive deposition at hazardous waste landfills is required. Electrodialysis is presently being developed as an alternative method for treatment of such contaminated sediments. Heavy metals are removed by treating the sediments in suspension with an electric DC field, while ion-exchange membranes constitute a barrier between the sediment being treated and the concentrate liquid in which the contaminants are collected.
Original languageEnglish
Publication date2008
Publication statusPublished - 2008
EventElectrokinetics in Civil and Environmental Engineering: DTU - RILEM Course - Technical University of Denmark, Kgs. Lyngby, Denmark
Duration: 6 Oct 200810 Oct 2008

Course

CourseElectrokinetics in Civil and Environmental Engineering
LocationTechnical University of Denmark
CountryDenmark
CityKgs. Lyngby
Period06/10/200810/10/2008
OtherLecture 2: Concrete chemistry and porosity Lecture 3: Chloride ingress and carbonation

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