Reducing volatilization of heavy metals in phosphate-pretreated municipal solid waste incineration fly ash by forming pyromorphite-like minerals.
Reducing volatilization of heavy metals in phosphate-pretreated municipal solid waste incineration fly ash by forming pyromorphite-like minerals.
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DOI：
10.1016/j.wasman.2010.10.011
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发表时间：
2011-02
期刊：
影响因子：
8.1
通讯作者：
Ying Sun;Jianchang Zheng;L. Zou;Qiang Liu;P. Zhu;G. Qian
中科院分区：
文献类型：
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作者：
Ying Sun;Jianchang Zheng;L. Zou;Qiang Liu;P. Zhu;G. Qian
本研究探讨了通过磷酸盐预处理形成焦闪石样矿物，减少城市生活垃圾焚烧（MSWI）飞灰中重金属（铅、锌、镉）挥发的可行性。为了评估磷酸盐预处理城市生活垃圾飞灰中三种重金属的蒸发特性，利用专用仪器在100-1000°C范围内进行了挥发试验。采用毒性特性浸出法（TCLP）试验和BCR序贯萃取法对磷稳定过程进行了评价。结果表明，经磷酸盐预处理后的城市生活垃圾飞灰的挥发性得到有效降低。磷预处理后的城市生活垃圾粉煤灰中形成的类焦闪石矿物对重金属具有化学固定和热稳定作用，是高温下减少城市生活垃圾粉煤灰中重金属挥发的主要原因。稳定效果令人鼓舞，为城市生活垃圾飞灰的潜在再利用提供了条件。
This research investigated the feasibility of reducing volatilization of heavy metals (lead, zinc and cadmium) in municipal solid waste incineration (MSWI) fly ash by forming pyromorphite-like minerals via phosphate pre-treatment. To evaluate the evaporation characteristics of three heavy metals from phosphate-pretreated MSWI fly ash, volatilization tests have been performed by means of a dedicated apparatus in the 100–1000°C range. The toxicity characteristic leaching procedure (TCLP) test and BCR sequential extraction procedure were applied to assess phosphate stabilization process. The results showed that the volatilization behavior in phosphate-pretreated MSWI fly ash could be reduced effectively. Pyromorphite-like minerals formed in phosphate-pretreated MSWI fly ash were mainly responsible for the volatilization reduction of heavy metals in MSWI fly ash at higher temperature, due to their chemical fixation and thermal stabilization for heavy metals. The stabilization effects were encouraging for the potential reuse of MSWI fly ash.