Leaching characterisation and geochemical modelling of minor and trace elements released from recycled concrete aggregates

被引：116

作者：

Engelsen, Christian J. ^{[1
]}

van der Sloot, Hans A.

Wibetoe, Grethe ^{[2
]}

Justnes, Harald ^{[1
]}

Lund, Walter ^{[2
]}

Stoltenberg-Hansson, Erik

机构：

[1] SINTEF Bldg & Infrastruct, N-0314 Oslo, Norway

[2] Univ Oslo, Dept Chem, N-0316 Oslo, Norway

来源：

CEMENT AND CONCRETE RESEARCH | 2010年 / 40卷 / 12期

关键词：

Crushed concrete; Metals; Leaching; Equilibrium; Geochemical modelling; MSWI BOTTOM ASH; ENVIRONMENTAL-IMPACT; CALCIUM SILICATE; ION-BINDING; CEMENT; MECHANISMS; ADSORPTION; HYDRATION; SORPTION; IRON;

D O I：

10.1016/j.cemconres.2010.08.001

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The pH dependent release of Cd, Cr, Cu, Mn, Mo, Ni, Pb, V and Zn from different recycled concrete aggregate samples was determined. Geochemical speciation modelling was applied on the concentrations of Cu, Cr, Mo and Ni in the leachates in order to predict the measured concentrations and the specific release mechanisms. The model was able to reproduce the characteristic pH dependent release patterns for these elements and reasonable to sometimes excellent matches between the predicted and measured concentrations were achieved. Binding of Mo and Cr as oxyanions (MoO42- and CrO42-) to ettringite was modelled with fair agreement for Cr only. For Cu and Ni, the predicted and measured concentrations agreed well for the partly carbonated sample at high alkaline pH (11-13). The importance of complexation to humic substances was also shown in samples derived from construction debris. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：1639 / 1649

页数：11

共 53 条

[1]

ALLISON J.D., 1991, MINTEQA2 PRODEFA2 GE

[2]

[Anonymous], 2005, CEN/TS 14429

[3] MOLYBDENUM ADSORPTION BY ALUMINUM AND IRON-OXIDES AND HUMIC-ACID [J].