Acta Chimica Sinica ›› 2012, Vol. 0 ›› Issue (05): 659-666 .DOI: 10.6023/A1104073 Previous Articles     Next Articles

Full Papers

医疗垃圾焚烧飞灰中OCDD/OCDF 的球磨机械化学法降解试验研究

毛琼晶a, 彭政b, 陆胜勇a, 李晓东a, 严建华a   

  1. a 浙江大学热能工程研究所 能源清洁利用国家重点实验室 杭州 310027;
    b 中华人民共和国环境保护部 环境保护对外合作中心 北京 100035
  • 投稿日期:2011-04-07 修回日期:2011-10-10 发布日期:2011-11-28
  • 通讯作者: 彭政, 陆胜勇;
  • 基金资助:

    国家重点基础研究发展计划项目(No. 2011CB201500), 浙江省科技计划项目(No. 2009C13004)和国家自然科学基金(No. 50776081)资助项目.

Mechanochemical Degradation of OCDD/OCDF in Fly Ash from Medical Waste Incinerators

Mao Qiongjinga, Peng Zhengb, Lu Shengyonga, Li Xiaodonga, Yan Jianhuaa   

  1. a State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027;
    b Foreign Economic Cooperation Office, Ministry of Environmental Protection of People's Republic of China, Beijing 100035
  • Received:2011-04-07 Revised:2011-10-10 Published:2011-11-28
  • Supported by:

    Project supported by the Major State Basic Research Development Program of China (973 Program, No. 2011CB201500), Science and Technology Project of Zhejiang Province (No. 2009C13004) and the National Natural Science Foundation of China (No. 50776081).

Applying mechanochemical (MC) method to treat waste containing dioxins is our research area. Two fly ash samples are collected from baghouse filters cleaning the effluent of a rotary kiln pyrolysis+ fluidized bed post-combustor and of a simple fixed bed medical waste incinerator (MWI). Dioxins and other organics in fly ash are removed, octa-chlorinated dibenzo-p-dioxin and -furan (OCDD/OCDF) are used to dope the fly ash before their MC treatment in a laboratory developed planetary ball mill. In the case of fly ash from a simple fixed bed MWI, the contents of OCDD and OCDF are decreased by 64.7% and 63.6% respectively and the degree of chlorination decreases from 6.86 to 5.53. The treated fly ash is characterized by a more homogeneous distribution, a significant decrease in overall particle size as well as great enlargement in surface area and significant reduction of the original CaCO3 content. The experimental results show that the MC degradation of dioxins is significant, and certain compounds (CaCO3 et al.) in fly ash may act as dechlorinating reductant (e.g. CaO) in the process. The experiment may be practically helpful for removal of dioxin-like POPs in medical waste incineration fly ash.

Key words: fly ash, dioxin, mechanochemical treatment, ball milling, degradation efficiency