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Potential Hazards of Brominated Carbon Sorbents for Mercury Emission Control

机译：溴化碳吸附剂对汞排放的潜在危害

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摘要

Mercury is a toxic air pollutant, emitted from the combustion of coal. Activated Carbon (AC) or other carbon sorbent (CS) injection into coal combustion flue gases can remove elemental mercury through an adsorption process. Recently, a brominated CS with biomass ash as the carbon source (Br-Ash) was developed as an alternative for costly AC-based sorbent for mercury capture. After mercury capture, these sorbents are disposed in landfill, and the stability of bromine and captured mercury is of paramount importance. The objective of this study is to determine the fate of mercury and bromine from Br-Ash and brominated AC after their service. Mercury and bromine leaching tests were conducted using the standard toxicity characteristic leaching procedure (TCLP). The mercury was found to be stable on both the Br-Ash and commercial brominated AC sorbents, while the bromine leached into the aqueous phase considerably. Mercury pulse injection tests on the sorbent material after leaching indicate that both sorbents retain significant mercury capture capability even after the majority of bromine was removed. Testing of the Br- Ash sorbent over a wider range of pH and liquid:solid ratios resulted in leaching of ＜5% of mercury adsorbed on the Br-Ash. XPS analysis indicated more organically bound Br and less metal-Br bonds after leaching.
机译：汞是有毒的空气污染物，是煤炭燃烧产生的。向煤燃烧烟气中注入活性炭（AC）或其他碳吸附剂（CS）可以通过吸附过程除去元素汞。最近，开发了一种以生物质灰分作为碳源的溴化CS（Br-Ash），以替代昂贵的基于AC的汞捕获吸附剂。捕集汞后，这些吸附剂被丢弃在垃圾填埋场中，溴和捕集的汞的稳定性至关重要。这项研究的目的是确定使用后的Br-Ash和溴化AC中的汞和溴的命运。使用标准的毒性特征浸出程序（TCLP）进行了汞和溴的浸出测试。发现汞在Br-Ash和商业溴化AC吸附剂上均稳定，而溴则大量浸入水相中。浸出后对吸附剂材料进行的汞脉冲注入测试表明，即使除去了大多数溴之后，两种吸附剂仍具有显着的汞捕获能力。在较宽的pH值和液固比范围内测试Br-Ash吸附剂会导致Br-Ash吸附的汞的溶出率小于5％。 XPS分析表明，浸出后更多的有机键结合了Br，金属-溴键更少。

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  • 来源
    《Environmental Science & Technology》 |2015年第4期|2496-2502|共7页
  • 作者

    Teresa M. Bisson; Zhenghe Xu;

  • 作者单位

    Department of Chemical and Materials Engineering, Seventh Floor, Electrical & Computer Engineering Research Facility (ECERF), University of Alberta, Edmonton, Alberta, Canada, T6G 2V4;

    Department of Chemical and Materials Engineering, Seventh Floor, Electrical & Computer Engineering Research Facility (ECERF), University of Alberta, Edmonton, Alberta, Canada, T6G 2V4,Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, P.R. China, 1000084;

  • 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
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