Leaching Behavior of Heavy Metals from Cement Pastes Containing Solid Wastes

2018 International Conference of Green Buildings and Environmental Management

土木建筑工程;生态环境科学

Yuan, Xiaolu^1

Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, China Three Gorges University, Ministry of Education, Yichang

443002, China^1

关键词: Curing condition;    Environmental assessment;    Leaching behavior;    Leaching characteristics;    Leaching concentrations;    Long term exposure;    Municipal solid waste incineration fly ashes;    Water environments;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/186/3/012043/pdf
DOI  :  10.1088/1755-1315/186/3/012043

来源: IOP

【 摘 要 】

The leaching behavior of heavy metals from the cement pastes containing solid wastes including fly ash (FA), or municipal solid waste incineration fly ash (MSWI), was investigated by means of the tank test. Effects of two kinds of curing conditions (standard curing and natural curing) and carbonation on the leaching characteristics of heavy metals were studied. The environmental assessment relating to the leaching of heavy metals was also discussed. Results indicate that the leached heavy metals are mostly produced at early age of 28d, and subsequently decrease sharply to be undetected. Specimens subjected to the standard curing exhibit the lower ∑64d leaching concentrations of heavy metals than those exposed to the natural curing. Specimens under carbonation show the highest ∑64d leaching concentrations of heavy metals, compared with those at the standard curing and the natural curing. The long-term exposure of cement concrete containing MSWI and FA to the water environment may lead to the Cr pollution and the Cd pollution, respectively.