MIGRATION OF LIGNOSULFONATES IN A KARSTIC-FRACTURED POROUS AQUIFER - HISTORY AND PROGNOSIS FOR A ZN-PB MINE, POMORZANY, SOUTHERN POLAND

Lignosulfonate lyes, which had been deposited by a paper factory for a bout 50 years into Quaternary sediments and accumulated in a quasistag nant depression, became mobile when a depression cone caused by mine a ctivity in a deeper aquifer reached the erosion window close to the di sposal site. Their transport parameters in the karstic-fractured-porou s carbonate aquifer are shown to be mainly governed by diffusion betwe en the mobile water in karstic channels and fractures and the stagnant water in matrix, although the hydraulic conductivity is shown to depe nd mainly on the karstic system. The main transport velocity is, with a sufficient accuracy, related to the hydraulic conductivity by a simp le model in which matrix porosity is the governing rock parameter. The dispersivity, although also governed by matrix diffusion, depends str ongly on several parameters that are difficult to determine.