...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Environmental Science and Technology >Effect of co-contaminated soil mixtures as fixed/fluidized bed media on pollutants emission under thermal treatment
【24h】

Effect of co-contaminated soil mixtures as fixed/fluidized bed media on pollutants emission under thermal treatment

机译：共污染土壤混合物作为固定/流化床介质对热处理过程中污染物排放的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Thermal treatment of soil polluted by lube oil and heavy metals (cadmium, chromium, copper, and lead) was carried out by using a laboratory-scale incinerator. The effect of co-contaminated soil mixtures as fixed/fluidized bed media was studied with different ratios of sand bed amount to soil feeding. Additionally, the effect of soil moisture content on incineration system was further investigated. The reduction in air input altered the mode of fluidized bed to fixed bed which resulted in an increase in organic pollutants such as benzene, toluene, ethylbenzene, xylene, and polycyclic aromatic hydrocarbons. The combustion efficiency of fixed bed mode was observed to be relatively high at a lower ratio of sand bed amount to soil feeding, whereas high combustion efficiency was found in fluidized bed mode at a higher ratio of sand bed amount to soil feeding. Much higher concentration of organic pollutants in both gas phase and bottom ash is found under a higher soil moisture content. In addition, the increase in moisture content has resulted in an increase in lead, cadmium, and chromium in fly ash while copper was decreased. An important consideration is that the partitioning of heavy metals was randomly distributed in particle sizes of bottom ash. The highest concentration of heavy metals was deposited on fine-sized particle. The distribution of heavy metals in medium-sized and coarse-sized particles to form eutectic species might be produced by the soil-sand aggregation.
机译：使用实验室规模的焚烧炉对被润滑油和重金属（镉，铬，铜和铅）污染的土壤进行了热处理。研究了不同污染的土壤混合物作为固定/流化床介质的影响，其中沙床量与土壤进料的比例不同。此外，进一步研究了土壤水分含量对焚烧系统的影响。空气输入量的减少将流化床的模式改变为固定床，从而导致有机污染物的增加，例如苯，甲苯，乙苯，二甲苯和多环芳烃。固定床模式的燃烧效率在较低的砂床量与土壤进料的比率下观察到较高的燃烧效率，而在流化床模式下的较高的砂床量与土壤进料的比率则发现较高的燃烧效率。在较高的土壤水分含量下，气相和底灰中的有机污染物浓度更高。另外，水分含量的增加导致粉煤灰中铅，镉和铬的增加，而铜的减少。一个重要的考虑因素是重金属的分配是随机分布在底灰的粒径中。最高浓度的重金属沉积在细颗粒上。重金属在中型和粗型颗粒中形成共晶物种的分布可能是由于土壤-砂的聚集而产生的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号