Modeling Nickel Leaching from Abandoned Mine Tailing Deposits in Jøssingfjorden

Underwater disposal of mine tailings in lakes and seas has been considered favorable due to the geochemical stability obtained during long-term storage anoxic sediments. Sulfides are stable ore; however, oxidation transformation some substances into more soluble forms may impact bioavailability processes enhance risk toxic effects aquatic environment. The goal this work was construct a model for simulating nickel (Ni) cycle water column upper sediments apply it tailing sea deposit Jøssingfjord, SouthWest Norway. A one-dimensional (1D) benthic–pelagic coupled biogeochemical model, BROM, supplemented with Ni module specifically developed study used. optimized using field data collected from fjord. predicted that current high concentrations sediment can be potential source leaching until about 2040. top 10 cm were classified as being “poor” environmental state according Norwegian Quality Standards. numerical experiment complete cessation discharges there would an improvement “good” 20 years. On other hand, doubling discharge lead increase content sediment, approaching boundary “very poor” state. results demonstrated deposits increased reworking by bioturbation at sediment–water interface. instrument analysis different scenarios activities point view reduction component best available technology.