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Title: Kraft pulp mill dregs and grits as permeable reactive barrier for removal of copper and sulfate in acid mine drainage
Authors: Farage, Rogério M P
Quina, Margarida J. 
Gando-Ferreira, Licínio M. 
Silva, Cláudio M.
de Souza, José João L. L.
Torres, Caio M. M. E.
Issue Date: 5-Mar-2020
Publisher: Springer Nature
Project: Strategic Research Center Project Pest-C/EQB/UI0102 
“Programa de Pos-Graduacao em Ciencias Florestais da Universidade Federal de Viçosa”, Brazil, and the FAPEMIG scholarship 
CELBI industrial plant provided the samples of dregs and grits 
Serial title, monograph or event: Scientific Reports
Volume: 10
Issue: 1
Abstract: Mining is an essential human activity, but results in several environmental impacts, notably the contamination of ground and surface water through the presence of toxic substances such as metals and sulfates in mine drainage. Permeable reactive barriers (PRB) have been applied to remediate this environmental impact, but the high costs associated with the maintenance of this system are still a challenge. The main objective of this study was to evaluate the use of kraft pulp mill alkaline residues, known as dregs and grits, as material for PRB, and to determine their capacity for retaining copper and sulfate. The work was carried out in laboratory 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 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 (S:L) ratio of 1:10.
ISSN: 2045-2322
DOI: 10.1038/s41598-020-60780-2
Rights: openAccess
Appears in Collections:I&D CIEPQPF - Artigos em Revistas Internacionais

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