...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Waste management & research >Influences of ammonia contamination on leaching from air-pollution-control residues
【24h】

Influences of ammonia contamination on leaching from air-pollution-control residues

机译：氨污染对空气污染控制残留物浸出的影响

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

Application of selective non-catalytic reduction systems at municipal solid waste incinerators (MSWIs) often involves over-stoichiometric injection of ammonia into flue gases. Un-reacted ammonia may be deposited on fly ash particles and can ultimately influence the leaching behaviour of air-pollution-control (APC) residues. Batch tests were conducted to investigate the impacts of ammonia levels on leaching of a range of metals (sodium, potassium, calcium, aluminium, chromium, iron, lead, cadmium, copper, nickel and zinc), as well as chloride and dissolved organic carbon (DOC). Specific conductivity was also identified to reflect the soluble components. The results showed that with ammonia concentrations rising from a background level of 4 to 26,400 mg 1~(-1), the specific conductivity increased by 2-7 times as pH varied from alkaline to acidic values. DOC release was also significantly enhanced with high ammonia levels of 1400 mg 1~(-1) or higher at pH ＞ 9; however at these high ammonia concentrations, the role of DOC in cadmium, copper, nickel and zinc leaching was negligible. Based on the experimental data, chloride, sodium and potassium were leached at high concentrations regardless of pH and ammonia concentrations. For aluminium, chromium, iron and lead, ammonia had little impact on their leaching behaviour. With respect to cadmium, copper, nickel and zinc, high ammonia concentrations significantly increased leaching in the pH range of 8-12 due to the formation of metal-ammonia complexes, which was also proved in the speciation calculations. However, the overall results suggest that typical levels of ammonia injection in MSWIs are not likely to affect metal leaching from APC residues.
机译：选择性非催化还原系统在市政固体废物焚化炉（MSWI）上的应用通常涉及将化学计量的氨注入烟道气中。未反应的氨可能沉积在粉煤灰颗粒上，并最终影响空气污染控制（APC）残留物的浸出行为。进行批量测试以研究氨水平对多种金属（钠，钾，钙，铝，铬，铁，铅，镉，铜，镍和锌），氯化物和溶解有机碳的浸出的影响。 （DOC）。还确定了比电导率以反映可溶性组分。结果表明，随着氨浓度从4个本底水平增加到26,400 mg 1〜（-1），比电导率随pH值从碱性变化为酸性而增加了2-7倍。在pH＞ 9的情况下，当氨含量达到1400 mg 1〜（-1）或更高时，DOC的释放也显着增强。然而，在这些高氨浓度下，DOC在镉，铜，镍和锌浸出中的作用可忽略不计。根据实验数据，无论pH和氨的浓度如何，都会以高浓度浸出氯，钠和钾。对于铝，铬，铁和铅，氨对其浸出行为影响很小。对于镉，铜，镍和锌，由于形成了金属-氨配合物，在8-12的pH范围内，高氨浓度显着增加了浸出，这在形态计算中也得到了证明。但是，总体结果表明，MSWI中典型的氨注入水平不太可能影响APC残留物中的金属浸出。

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