CIESC Journal ›› 2013, Vol. 64 ›› Issue (5): 1833-1839.DOI: 10.3969/j.issn.0438-1157.2013.05.045

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Stabilization technology in treating municipal solid waste incineration fly ash using heavy metal chelating agent

XU Ying1, CHEN Yu2, FENG Yueyang2   

  1. 1. Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes of Ministry of Education, Hohai University, Nanjing 210098, Jiangsu, China;
    2. School of Environmental Engineering, Hohai University, Nanjing 210098, Jiangsu, China
  • Received:2012-10-22 Revised:2012-12-16 Online:2013-05-05 Published:2013-05-05
  • Supported by:

    supported by the National Natural Science Foundation of China(51079049).

重金属螯合剂处理垃圾焚烧飞灰的稳定化技术

徐颖1, 陈玉2, 冯岳阳2   

  1. 1. 河海大学浅水湖泊综合治理与资源开发教育部重点实验室, 江苏 南京 210098;
    2. 河海大学环境学院, 江苏 南京 210098
  • 通讯作者: 徐颖
  • 作者简介:徐颖(1957-),女,教授。
  • 基金资助:

    国家自然科学基金项目(51079049)。

Abstract: In view of treatment efficiency and stability about stabilization treatment of fly ash from municipal solid waste incineration,a stabilization technology was developed for treating heavy metals in fly ash using organic heavy metal chelator ammonium dipropyl dithiophosphate(ADD).The effect of pH on heavy metal leached amount from stabilized fly ash was studied.The contents of different forms of heavy metals in fly ash were compared before and after stabilization treatment with ADD chelator,and the stabilization effect was analyzed with different amounts of ADD chelator.The result showed that stabilization rate against Pb,Zn,and Cd of 1.5% ADD chelator reached 95.6%,85.5% and 93.4% respectively,and the amounts of Pb,Zn,and Cd in the leachate met the Pollution Control Standards for Hazardous Waste Landfill(GB 18598-2001)at pH values exceeding 3.The contents of Pb,Zn and Cd bound to carbonates in fly ash after ADD chelator treatment was significantly decreased with significantly increased contents bound to organic matter.The Pb,Zn and Cd stable form contents increased by 15.4%,17.1% and 24.3% respectively,and accordingly reduced the risk of secondary pollution of stabilized products under environment change.The stabilization effect of ADD chelator on heavy metals in fly ash was apparently better than that of inorganic stabilizing agent lime and sodium sulfide.

Key words: heavy metal chelating agent, chemical stabilization, incineration fly ash, heavy metals forms

关键词: 重金属螯合剂, 药剂稳定化, 焚烧飞灰, 重金属形态

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