Metal leaching from MSWI bottom ash as affected by salt or dissolved organic matter

被引:29
作者
Olsson, S. [1 ]
Gustafsson, J. P. [1 ]
Kleja, D. Berggren [2 ]
Bendz, D. [3 ]
Persson, I. [4 ]
机构
[1] KTH Royal Inst Technol, Dept Land & Water Resources Engn, SE-10044 Stockholm, Sweden
[2] Swedish Univ Agr Sci, Dept Soil Sci, SE-75007 Uppsala, Sweden
[3] Swedish Geotech Inst, SE-58193 Linkoping, Sweden
[4] Swedish Univ Agr Sci, Dept Chem, SE-75007 Uppsala, Sweden
关键词
ENVIRONMENTAL-IMPACT; TRACE-ELEMENTS; ARSENATE; CARBON; WATER; PH; COMPLEXATION; FRACTIONS; GOETHITE; SORPTION;
D O I
10.1016/j.wasman.2008.03.017
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In order to manage municipal solid waste incineration (MSWI) bottom ash safely, risk assessments, including the prediction of leaching under different field conditions, are necessary. In this study, the influence of salt or dissolved organic matter (DOM) in the influent on metal leaching from MSWI bottom ash was investigated in a column experiment. The presence of salt (0.1 M NaCI) resulted in a small increase of As leaching, whereas no impact on leachate concentration was found when lakewater DOM (35.1 mg/I dissolved organic carbon) was added. Most of the added DOM was retained within the material. Further, X-ray spectroscopy revealed that Cu(II) was the dominating form of Cu and that it probably Occurred as a CuO-type mineral. The CU2+ activity in the MSWI bottom ash leachate was most likely determined by the dissolution of CuO together with the formation of Cu-DOM complexes and possibly also by adsorption to (hydr)oxide minerals. The addition of lake DOM in the influent resulted in lower saturation indices for CuO in the leachates. which may be due to slow CuO dissolution kinetics in combination with strong Cu-DOM complexation. (c) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:506 / 512
页数:7
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