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首页> 外文期刊>Environmental Science & Technology >Partial Removal of PCDD/Fs, Coplanar PCBs, and PCBs from Municipal Solid Waste Incineration Fly Ash by a Column Flotation Process
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Partial Removal of PCDD/Fs, Coplanar PCBs, and PCBs from Municipal Solid Waste Incineration Fly Ash by a Column Flotation Process

机译：通过柱浮选法部分去除市政固体垃圾焚烧粉煤灰中的PCDD / F，共面PCB和PCB

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摘要

Municipal solid waste incineration (MSWI) fly ash has recently attracted much attention because of its large quantity and enrichment of high toxic combustion generating organohalogen contaminants such as polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), coplanar polychlorinated biphenyls (coplanar PCBs), and polychlorinated biphenyls (PCBs). Since the organohalogen contaminants in MSWI fly ash are known to be enriched in the unburnt carbon (UC) fraction, the organohalogen contaminants can therefore be removed by the removal of UC. In this research, we used a modified column flotation technique to remove the organic contaminants from MSWI fly ash. UC was removed for 27.7% under the flotation condition without chemical flotation aids. The removal efficiencies of UC, PCDD/Fs, coplanar PCBs, and PCBs are further improved by adding flotation aids during the flotation process. UC was removed for 49.0% by adding a collector assistant with a HLB value of 13.5 and a concentration in the kerosene of 3% during the flotation process. In addition, the UC removal efficiencies are increased with the decrease of the diameter of the micropores in the gas spargers. By optimizing the flotation condition, 41.9% total PCDD/Fs, 40.8% coplanar PCBs, and 44.1% PCBs with 64.0% UC have been successfully removed from MSWI fly ash. The total toxic equivalent (TEQ) of the fly ash was decreased from 6.2 ng/g to 4.2 ng/g in the residue.
机译：市政固体垃圾焚烧（MSWI）粉煤灰由于其大量和高毒性燃烧而产生有机卤素污染物，例如多氯二苯并对二恶英（PCDDs），二苯并呋喃（PCDFs），共面多氯联苯（coplanar），因此备受关注。 PCBs）和多氯联苯（PCBs）。由于已知MSWI粉煤灰中的有机卤素污染物富含未燃烧的碳（UC）馏分，因此可以通过去除UC去除有机卤素污染物。在这项研究中，我们使用了改进的柱浮选技术去除了MSWI粉煤灰中的有机污染物。在不使用化学浮选助剂的浮选条件下，UC去除了27.7％。通过在浮选过程中添加浮选助剂，可进一步提高UC，PCDD / F，共面PCB和PCB的去除效率。在浮选过程中，通过添加HLB值为13.5且煤油中的浓度为3％的捕收助剂，可以去除UC的49.0％。另外，随着气体喷射器中微孔直径的减小，UC去除效率增加。通过优化浮选条件，已成功地从MSWI粉煤灰中去除了41.9％的总PCDD / F，40.8％的共面PCB和44.1％的UC（含64.0％）的PCB。粉煤灰的总毒性当量（TEQ）从残留物中的6.2 ng / g降低到4.2 ng / g。

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  • 来源
    《Environmental Science & Technology》 |2007年第1期|p.257-262|共6页
  • 作者

    YING HUANG; MASAKI TAKAOKA; NOBUO TAKEDA; KAZUYUKI OSHITA;

  • 作者单位

    Metals Recycling Group, Research Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba West, 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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