Details

Autor(en) / Beteiligte

• Tackley, H.A.
• Lake, C.B.
• Alimohammadi, M.

Titel

Examining metal migration through geotextiles during dewatering

Ist Teil von

• Geotextiles and geomembranes, 2021-02, Vol.49 (1), p.32-40

Ort / Verlag

Essex: Elsevier Ltd

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• This paper presents a study conducted to assess the influence that a filter cake deposited on the surface of the geotextile has on the mobility of three metals (Cu, Pb, Zn) during filtration of a contaminated sediment. Two chemical additives (cationic coagulant and cationic polymer) were introduced to the sediment to increase the particle size and improve the filtration efficiency. Bench scale experimentation was conducted to identify contaminant reduction using a small volume of sediment. A field test was applied to observe what effect three-dimensional filtration and a larger filter cake had on metal mobility. Analysis of the effluent was conducted to determine total and dissolved metal contaminants, as well as particulate matter. Effluent chemical properties (pH, Eh, and zeta potential) were analyzed to identify a possible rationale for variations in concentration during filtration. The results of the study show that as an increasing buildup of filter cake on the surface of a geotextile developed, filtrate quality was improved with respect to the metal and particulate contaminants considered. In addition, the metals detected in the effluent were primarily in the solid state, suggesting further reduction could be achieved through subsequent filtration (if desired). •Assess the influence of a filter cake deposit on the fate of three metals (Cu, Pb, Zn) during geotextile filtration.•As filter cake thickness increased, concentrations of both particulate and metal contaminants were reduced.•Filtrate quality was improved (relative to that sampled from an unsoiled geotextile) as more material was filtered.•The build-up of a filter cake on the surface of a geotextile was able to aid in the decontamination of a metal laden influent.•Eh, pH, and zeta potential were determined to identify mechanisms which may contribute to metal mobility during filtration.