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.

采矿是人类必不可少的活动，但会造成多种环境影响，特别是由于矿井排水中存在有毒物质（例如金属和硫酸盐）而污染地下水和地表水。已经应用了渗透性反应屏障（PRB）来补救这种环境影响，但是与维护该系统相关的高成本仍然是一个挑战。这项研究的主要目的是评估牛皮纸制浆厂碱性残渣（称为渣reg）用作PRB的材料，并确定其保留铜和硫酸盐的能力。这项工作是在实验室吸附动力学测定，批量测定和柱测试中进行的。测试元素表征，零电荷点，酸中和能力，总孔隙率，进行渣density和沙粒的堆积密度和水分测定。结果表明，由于化学沉淀机理，Cu的保留率很高，特别是在吸附动力学5分钟时残留物（99％）对Cu的保留。对于相同的测定，粗粒在180分钟后显示出相似的结果。在pH值低于5时，硫酸盐保留有效，对渣reg和粗粒的效率分别为79％和89％。Dregs展示了最佳的酸排水修复效果，固液比（S：L）为1:10。