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KRAFT PULP MILL DREGS AND GRITS AS PERMEABLE REACTIVE BARRIER FOR REMOVAL OF COPPER AND SULFATE IN ACID MINE DRAINAGE
Farage, R.M.P., M.J. Quina, L. Gando-Ferreira, C.M. Silva, J.J.L.L. de Souza, et al.
Scientific Reports 10:4083(2020)
This study evaluated the performance of kraft pulp mill alkaline residues known as dregs and grits as material for a permeable reactive barrier and determined their capacity for retaining copper and sulfate. The work was carried out in lab adsorption kinetics assays, batch assays, and column tests. Tests for elemental characterization, point of zero charge, acid neutralization capacity, total porosity, bulk density, and moisture content of the dregs and grits were conducted. The results showed high retention of Cu due to a chemical precipitation mechanism, notably for dregs (99%) at 5 min in adsorption kinetics. The grits presented similar results after 180 min for the same assay. Sulfate retention was effective at pH below 5, with an efficiency of 79% and 89% for dregs and grits, respectively. Dregs presented the best results for acid drainage remediation, notably with a solid:liquid ratio of 1:10.
Scientific Reports 10:4083(2020)
This study evaluated the performance of kraft pulp mill alkaline residues known as dregs and grits as material for a permeable reactive barrier and determined their capacity for retaining copper and sulfate. The work was carried out in lab adsorption kinetics assays, batch assays, and column tests. Tests for elemental characterization, point of zero charge, acid neutralization capacity, total porosity, bulk density, and moisture content of the dregs and grits were conducted. The results showed high retention of Cu due to a chemical precipitation mechanism, notably for dregs (99%) at 5 min in adsorption kinetics. The grits presented similar results after 180 min for the same assay. Sulfate retention was effective at pH below 5, with an efficiency of 79% and 89% for dregs and grits, respectively. Dregs presented the best results for acid drainage remediation, notably with a solid:liquid ratio of 1:10.
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