首页|Chelation treatment for heavy metals in municipal solid waste incineration fly ash: 300-Day study on stability and environmental risk

Chelation treatment for heavy metals in municipal solid waste incineration fly ash: 300-Day study on stability and environmental risk

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  • NETL
  • NSTL
  • Elsevier
Landfilling after chelation is the primary method for treating municipal solid waste incineration fly ash (MSWI FA), but the long-term environmental risks of its heavy metals (HMs) remain unclear. This study used three common organic chelating agents (CAs) to stabilize MSWI FA and assessed its 300-day stability under mixed and zoned landfill scenarios. The findings showed that Pb leaching posed high environmental risks, especially in zoned landfills, with 10-year cumulative leaching of 300 mgAg, while Cu and Zn leaching remained within limits, indicating lower environmental risks. In mixed landfills, 1.6 %-TS-300, 1.6 %-SDD, and 2.4 %-DP maintained HM leaching within landfill limits but exceeded them after 220, 30, and 60 days, respectively. In contrast, when zoned landfilling, the effective time of the chelated products was significantly shortened. Under landfill requirements, chelate effectiveness was significantly shorter, with TS-300, SDD, and DP stabilizing HMs for only 30, 18, and 10 days. The study found that CAs not only form organic complexes with HMs but also precipitates (e.g., CuS) in MSWI FA, reducing leaching. Furthermore, TS-300 can convert Pb from unstable Pb~(4+) to stable Pb~(2+) form, enhancing its long-term stability. In summary, CAs mitigate environmental risks of MSWI FA, but HMs leaching increase over time, especially in zoned landfills. It is advised to apply a waterproof cover to chelated MSWI FA during landfilling to mitigate environmental risks.

Municipal solid waste incineration fly ashHeavy metals stabilizationLeaching behaviorFraction analysisEnvironmental risk

Ze Zhang、Yang Yu、Yi Rao、Ying Wang、Chunjiang Yu、Zhongli Luo、Hongjun Zhao、Xiaona Wang、Ming Gao、Qunhui Wang、Chuanfu Wu

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School of Energy and Environmental Engineer, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China

Chengdu Xingrong Renewable Energy Co. Ltd., Chengdu 610000, China

Department of Biological Science, College of Life Sciences, Sichuan Normal University, Chengdu 610101 Sichuan, China

Organic Materials Research Laboratory, Tosoh Corporation, Shunan 746-8501, Japan

Department of Frontier Sciences for Advanced Environment, Graduate School of Environmental Studies, Tohoku University, Miyagi 980-8579, Japan

School of Energy and Environmental Engineer, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China||Shunde Innovation School University of Science and Technology Beijing, Guangdong, China

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2025

10.1016/j.wasman.2025.114745

Waste management

Waste management

SCI
ISSN：0956-053X
年,卷(期)：2025.200(Jun.)
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