Bauxite residue(BR),a by-product of the industrial production of alumina,has raised environmental concerns in the last decades,due to the presence of high amounts of alkali and various heavy metal ions.Limited studies...Bauxite residue(BR),a by-product of the industrial production of alumina,has raised environmental concerns in the last decades,due to the presence of high amounts of alkali and various heavy metal ions.Limited studies on the application of abandoned BR with massive consumption have been reported.In this study,the possibility of the revegetation using ryegrass growing on BR was discussed mainly through the growth indications and transfer of heavy metal ions in BR and plants.In the pot trails,ryegrass was seeded on BR,de-alkali BR,with(DBRO)or without(DBR)organic fertilizer,respectively.The results indicated that the remediation of bauxite residue can be achieved through de-alkali with acid neutralization.Elemental analysis indicated that the elements,except for Fe,Mn and Pb,were stable in plant roots,and ryegrass could hardly absorb Cd.But,some heavy metals such as Cu enriched in plants,which should be noted in revegetation on bauxite residue.展开更多
基金Projects(51704329,51705540)supported by the National Natural Science Foundation of ChinaProject(2018JJ3671)supported by the Hunan Provincial Natural Science Foundation,China+1 种基金Project(2015CX005)supported by the Innovation Driven Plan of Central South University,ChinaProject(B14034)supported by the National 111 Project,China
文摘Bauxite residue(BR),a by-product of the industrial production of alumina,has raised environmental concerns in the last decades,due to the presence of high amounts of alkali and various heavy metal ions.Limited studies on the application of abandoned BR with massive consumption have been reported.In this study,the possibility of the revegetation using ryegrass growing on BR was discussed mainly through the growth indications and transfer of heavy metal ions in BR and plants.In the pot trails,ryegrass was seeded on BR,de-alkali BR,with(DBRO)or without(DBR)organic fertilizer,respectively.The results indicated that the remediation of bauxite residue can be achieved through de-alkali with acid neutralization.Elemental analysis indicated that the elements,except for Fe,Mn and Pb,were stable in plant roots,and ryegrass could hardly absorb Cd.But,some heavy metals such as Cu enriched in plants,which should be noted in revegetation on bauxite residue.
