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Degradation characteristics of dioxin in the fly ash by washing and ball-milling treatment

机译：洗涤和球磨处理对粉煤灰中二恶英的降解特性

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摘要

In this study, samples were taken from different types of municipal waste incineration plants in the Pearl River Delta, China. Analyzing the distributive characters of elements and dioxin congeners in fly ash, the method of washing-ball milling was utilized to remove chloride and degrade dioxin in fly ash. The results showed that more than 90% of particles were in the range of 1 50 pm and most of dioxin and metals existed in 0.030 similar to 0.075 mm of particles. K, Na, Cl and Br in fly ash could be removed by washing efficiently, however dioxin and other metals remained in the solid phase. Washing and Fe/Ni-SiO2 ball milling method seemed to be the best choice as the dioxin removal rate could reach up to 93.20%. Dioxin could be degraded to low toxic compounds and heterochorides with Fe/Ni as dechlorinating agent. In the process, PCDFs were partly transformed to PCDDs, while too long time of ball-milling was not benefited for dioxin removing. In addition, the phases of calcium such as Ca(OH)(2), CaCO3 and CaSO4 in fly ash could transform from crystal to amorphous. (C) 2017 Elsevier B.V. All rights reserved.
机译：在这项研究中，样本取自中国珠江三角洲的不同类型的城市垃圾焚烧厂。分析了粉煤灰中元素和二恶英同类物的分布特征，采用洗涤球磨法去除了粉煤灰中的氯并降解了二恶英。结果表明，超过90％的颗粒在1 50 pm范围内，并且大部分二恶英和金属以0.030的形式存在，与0.075 mm的颗粒相似。可以通过有效洗涤除去飞灰中的K，Na，Cl和Br，但是二恶英和其他金属保留在固相中。洗涤和Fe / Ni-SiO2球磨法似乎是最佳选择，因为二恶英的去除率可高达93.20％。以Fe / Ni为脱氯剂可将二恶英降解为低毒化合物和杂卤化物。在此过程中，PCDFs部分转化为PCDDs，而球磨时间过长则不利于去除二恶英。此外，飞灰中的钙相如Ca（OH）（2），CaCO3和CaSO4可以从晶体转变为无定形。 （C）2017 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Journal of Hazardous Materials》 |2017年第5期|191-199|共9页
  • 作者

    Li Baohua; Deng Zhiyi; Wang Wenxiang; Fang Hongsheng; Zhou Haibiao; Deng Fangxin; Huang Ling; Li Huiying;

  • 作者单位

    Xiangtan Univ, Coll Environm & Resources, Xiangtan 411100, Hunan, Peoples R China;

    Xiangtan Univ, Coll Environm & Resources, Xiangtan 411100, Hunan, Peoples R China;

    Guangdong Polytech Environm Protect Engn, Key Lab Prevent Heavy Met Pollut & Comprehens Uti, Foshan 528216, Guangdong, Peoples R China;

    Guangdong Polytech Environm Protect Engn, Key Lab Prevent Heavy Met Pollut & Comprehens Uti, Foshan 528216, Guangdong, Peoples R China;

    Xiangtan Univ, Coll Environm & Resources, Xiangtan 411100, Hunan, Peoples R China;

    Xiangtan Univ, Coll Environm & Resources, Xiangtan 411100, Hunan, Peoples R China;

    Guangdong Polytech Environm Protect Engn, Key Lab Prevent Heavy Met Pollut & Comprehens Uti, Foshan 528216, Guangdong, Peoples R China;

    Guangdong Polytech Environm Protect Engn, Key Lab Prevent Heavy Met Pollut & Comprehens Uti, Foshan 528216, Guangdong, Peoples R China;

  • 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
  • 关键词

    Fly ash; Dioxin; Elements; Washing; Ball-milling;

    机译：粉煤灰;二恶英;元素;洗涤;球磨;

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