Wang Chun-Feng, Chen Guan-Fei, Zhu Yan-Chen, Yao Dan, Huang Xiao-Chen, Wang Lian-Jun
Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, Xinxiang 453007, China.
Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Huan Jing Ke Xue. 2016 Dec 8;37(12):4891-4898. doi: 10.13227/j.hjkx.201605141.
Size fractionation and chemical composition of municipal solid waste incinerator (MSWI) fly ash were investigated. And the leaching efficiency of heavy metals was contrastively studied using toxicity characteristic leaching procedure (TCLP), European standard protocol (EN12457-2), sequential extraction procedure (SEP) and physiologically based extraction test (PBET) for different size-fractionated fly ash. The results indicated that the main compositing elements of fly ash were Ca, Si, Al, Mg, Fe, Na, K. 58.7% of fly ash particles were in the range of 38-106 μm and the amount in the<150 μm particle-size fraction accounted for more than 90% of in total, Cu, Pb and Cd mainly existed in the residual form with a minor amount of exchange fraction for any size-fractioned fly ash particles. TCLP result showed that leaching amounts of Zn, Cu and Pb, except for As and V, firstly increased and then decreased with the reduction of particle size. The leaching amount of Zn reached the highest value of 547 mg·kg in the range of 38-106 μm, whereas the leaching amount of heavy metals exhibited a lower level for all size-fractioned fly ash particles. The extraction concentrations of Zn, Pb, Cu and As reached 3270, 339, 335 and 16.8 mg·kg for the PBET tests, respectively, which were significantly higher than those of the TCLP. Therefore, heavy metals in MSWI fly ash had the potential bioavailability to human body.
对城市固体废弃物焚烧炉（MSWI）飞灰进行了粒径分级和化学成分分析。并采用毒性特性浸出程序（TCLP）、欧洲标准协议（EN12457-2）、连续提取程序（SEP）和基于生理学的提取试验（PBET），对不同粒径分级的飞灰中重金属的浸出效率进行了对比研究。结果表明，飞灰的主要组成元素为Ca、Si、Al、Mg、Fe、Na、K。58.7%的飞灰颗粒粒径在38-106μm范围内，粒径小于150μm的颗粒占总量的90%以上，对于任何粒径分级的飞灰颗粒，Cu、Pb和Cd主要以残留态存在，交换态含量较少。TCLP结果表明，除As和V外，Zn、Cu和Pb的浸出量随粒径减小先增加后降低。Zn的浸出量在38-106μm范围内达到最高值547mg·kg，而所有粒径分级的飞灰颗粒中重金属的浸出量均处于较低水平。PBET试验中Zn、Pb、Cu和As的提取浓度分别达到3270、339、335和16.8mg·kg，显著高于TCLP试验结果。因此，MSWI飞灰中的重金属对人体具有潜在的生物可利用性。
