...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Nitrate Removal via a Formate Radical-Induced Photochemical Process
【24h】

Nitrate Removal via a Formate Radical-Induced Photochemical Process

机译：通过甲酰胺自由基诱导的光化学过程去除硝酸盐

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

Removal of excess nitrate is critical to balance the nitrogen cycle in aquatic systems. This study investigated a novel denitrification process by tailoring photochemistry of nitrate with formate. Under UV light irradiation, short-lived radicals (i.e., HO center dot, NO2 center dot, and CO3 center dot-) generated from nitrate photolysis partially oxidized formate to highly reductive formate radical (CO3 center dot-). CO3 center dot- further reduced nitrogen intermediates generated during photochemical denitrification (mainly NO center dot, HNO, and N2O) to gas phase nitrogen (i.e., N2O and N-2). The degradation kinetics of total dissolved nitrogen was mainly controlled by the photolysis rates of nitrate and nitrite. The distribution of final products was controlled by the reaction between CO2 center dot- and N2O. To achieve a simultaneous and complete removal of dissolved nitrogen (i.e., nitrate, nitrite, and ammonia) and organic carbon, the formate-to-nitrate stoichiometry was determined as 3.1 +/- 0.2 at neutral pH in deionized water. Solution pH impacted the removal rates of nitrate and nitrite but not that of total dissolved nitrogen or formate. The presence of dissolved organic matter at levels similar to those in groundwater had a negligible impact on the photochemical denitrification process. A high denitrification efficiency was also achieved in a synthetic groundwater matrix. Outcome from this study provides a potential denitrification technology for decentralized water treatment and reuse facilities to abate nitrate in local water resources.
机译：去除过量的硝酸盐对于平衡水生系统中的氮循环至关重要。这项研究通过调整硝酸盐与甲酸盐的光化学反应，研究了一种新型的反硝化过程。在紫外线照射下，硝酸盐光解产生的短寿命自由基（即HO中心点，NO2中心点和CO3中心点-）将甲酸部分氧化为高还原性甲酸根（CO3中心点-）。 CO3中心点进一步减少了在光化学反硝化过程中生成的氮中间产物（主要是NO中心点，HNO和N2O）为气相氮（即N2O和N-2）。总溶解氮的降解动力学主要受硝酸盐和亚硝酸盐的光解速率控制。最终产物的分布由CO 2中心点和N 2 O之间的反应控制。为了同时完全去除溶解的氮（硝酸盐，亚硝酸盐和氨）和有机碳，甲酸-硝酸盐的化学计量在去离子水中的中性pH为3.1 +/- 0.2。溶液的pH影响硝酸盐和亚硝酸盐的去除率，但不影响总溶解氮或甲酸的去除率。溶解有机物的含量与地下水中的含量相似，对光化学反硝化过程的影响可忽略不计。在合成地下水基质中也实现了很高的反硝化效率。这项研究的结果为分散水处理和再利用设施提供了一种潜在的反硝化技术，以减少当地水资源中的硝酸盐。

著录项

  • 来源
    《Environmental Science & Technology》 |2019年第1期|316-324|共9页
  • 作者

    Chen Gongde; Hanukovich Sergei; Chebeir Michelle; Christopher Phillip; Liu Haizhou;

  • 作者单位

    Univ Calif Riverside, Dept Chem & Environm Engn, Riverside, CA 92521 USA;

    Univ Calif Riverside, Dept Chem & Environm Engn, Riverside, CA 92521 USA;

    Univ Calif Riverside, Dept Chem & Environm Engn, Riverside, CA 92521 USA;

    Univ Calif Riverside, Dept Chem & Environm Engn, Riverside, CA 92521 USA|Univ Calif Santa Barbara, Dept Chem Engn, Santa Barbara, CA 93106 USA;

    Univ Calif Riverside, Dept Chem & Environm Engn, Riverside, CA 92521 USA;

  • 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