...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Adsorption of N-Nitrosodimethylamine Precursors by Powdered and Granular Activated Carbon
【24h】

Adsorption of N-Nitrosodimethylamine Precursors by Powdered and Granular Activated Carbon

机译：粉末状和颗粒状活性炭吸附N-亚硝基二甲胺前体

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

Activated carbon (AC) has been shown to remove precursors of halogenated disinfection byproducts. Granular and powdered activated carbon (GAC, PAC) were investigated for their potential to adsorb N-nitrosodimethylamine (NDMA) precursors from blends of river water and effluent from a wastewater treatment plant (WWTP). At bench scale, waters were exposed to lignite or bituminous AC, either as PAC in bottle point experiments or as GAC in rapid small-scale column tests (RSSCTs). NDMA formation potential (FP) was used as a surrogate for precursor removal NDMA FP was reduced by 37, 59, and 91% with 3, 8, and 75 mg/L of one PAC, respectively, with a 4-h contact time. In RSSCTs and in full-scale GAC contactors, NDMA FP removal always exceeded that of the bulk dissolved organic carbon (DOC) and UV absorbance at 254 run. For example, whereas DOC breakthrough exceeded 90% of its influent concentration after 10 000 bed volumes of operation in an RSSCT, NDMA FP was less than 40% of influent concentration after the same bed life of the GAC. At full or pilot scale, high NDMA FP reduction ranging from >60 to >90% was achieved across GAC contactors, dependent upon the GAC bed life and/or use of a preoxidant (chlorine or ozone). In all experiments, NDMA formation was not reduced to zero, which suggests that although some precursors are strongly sorbed, others are not. This is among the first studies to show that AC is capable of adsorbing NDMA precursors, but further research is needed to better understand NDMA precursor chemical properties (e.g., hydrophobicity, molecular size) and evaluate how best to incorporate this finding into full-scale designs and practice.
机译：活性炭（AC）已显示去除卤化消毒副产物的前体。研究了颗粒状和粉末状活性炭（GAC，PAC）吸附从河水和废水处理厂（WWTP）的混合物中吸收的N-亚硝基二甲胺（NDMA）前体的潜力。在实验室规模下，将水暴露于褐煤或沥青AC中，无论是在瓶口实验中作为PAC还是在快速小规模色谱柱试验（RSSCT）中作为GAC暴露。 NDMA形成潜能（FP）用作前体去除的替代物NDMA FP分别以3、8和75 mg / L的一种PAC在4小时的接触时间内分别降低了37％，59％和91％。在RSSCT和全尺寸GAC接触器中，NDMA FP的去除率始终超过254运行时的整体溶解有机碳（DOC）和紫外线吸收率。例如，在RSSCT中进行10000个床体积的操作后，DOC的突破量超过了进水浓度的90％，而在GAC的相同床龄下，NDMA FP却不到进水浓度的40％。在完全或中试规模下，取决于GAC床的寿命和/或使用的预氧化剂（氯或臭氧），在整个GAC接触器中NDMA FP的高还原率可达到> 60％至> 90％。在所有实验中，NDMA的形成都没有减少到零，这表明尽管某些前体被强烈吸附，但其他前体却没有被吸附。这是第一批表明AC能够吸附NDMA前体的研究，但还需要进一步研究以更好地理解NDMA前体的化学性质（例如疏水性，分子大小），并评估如何最好地将这一发现纳入全面设计和练习。

著录项

  • 来源
    《Environmental Science & Technology》 |2012年第22期|12630-12639|共10页
  • 作者

    David Hanigan; Jinwei Zhang; Pierre Herckes; Stuart W. Krasner; Chao Chen; Paul Westerhoff;

  • 作者单位

    School of Sustainable Engineering and the Built Environment, Arizona State University, Box 5306, Tempe, Arizona 85287-5306, United States;

    Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States;

    Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States;

    Metropolitan Water District of Southern California, Water Quality, 700 Moreno Avenue, La Verne, California 91750, United States;

    School of the Environment, Tsinghua University, Beijing, P.R. China 100084;

    School of Sustainable Engineering and the Built Environment, Arizona State University, Box 5306, Tempe, Arizona 85287-5306, United States;

  • 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

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