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首页> 外文期刊>Environmental Science & Technology >Anaerobic Disposal of Arsenic-Bearing Wastes Results in Low Microbially Mediated Arsenic Volatilization
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Anaerobic Disposal of Arsenic-Bearing Wastes Results in Low Microbially Mediated Arsenic Volatilization

机译：含砷废物的厌氧处理导致微生物介导的砷挥发低

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摘要

The removal of arsenic from drinking water sources produces arsenic-bearing wastes, which are disposed of in a variety of ways. Several disposal options involve anaerobic environments, including mixing arsenic waste with cow dung, landfills, anaerobic digesters, and pond sediments. Though poorly understood, the production of gaseous arsenic species in these environments can be a primary goal (cow dung mixing) or an unintended consequence (anaerobic digesters). Once formed, these gaseous arsenic species are readily diluted in the atmosphere. Arsenic volatilization can be mediated by the enzyme arsenite S-adenosylmethionine methyltransferase (ArsM) or through the enzymes involved in methanogenesis. In this study, methanogenic mesocosms with arsenic-bearing ferric iron waste from an electrocoagulation drinking water treatment system were used to evaluate the role of methanogenesis in arsenic volatilization using methanogen inhibitors. Arsenic volatilization was highest in methanogenic mesocosms, but represented ＜0.02% of the total arsenic added. 16S rRNA cDNA sequencing, qPCR of mcrA transcripts, and functional gene array-based analysis of arsM expression, revealed that arsenic volatilization correlated with methanogenic activity. Aqueous arsenic concentrations increased in all mesocosms, indicating that unintended contamination may result from disposal in anaerobic environments. This highlights that more research is needed before recommending anaerobic disposal intended to promote arsenic volatilization.
机译：从饮用水源中去除砷会产生含砷废物，这些废物可以通过多种方式进行处理。几种处置方式涉及厌氧环境，包括将砷废物与牛粪，垃圾填埋场，厌氧消化池和池塘沉积物混合。尽管知之甚少，但在这些环境中产生气态砷可能是主要目标（牛粪混合）或意想不到的结果（厌氧消化器）。一旦形成，这些气态砷物质很容易在大气中被稀释。砷挥发可以通过亚砷酸S-腺苷甲硫氨酸甲基转移酶（ArsM）或通过参与甲烷生成的酶介导。在这项研究中，使用产自电凝饮用水处理系统的含砷三价铁废渣的产甲烷介孔膜，评估了产甲烷作用在使用产甲烷菌抑制剂的砷挥发中的作用。在产甲烷的甲烷中，砷的挥发最高，但占总添加砷的＜0.02％。 16S rRNA cDNA测序，mcrA转录本的qPCR以及基于功能基因阵列的arsM表达分析表明，砷挥发与产甲烷活性相关。所有中膜的砷水溶液浓度均增加，表明在厌氧环境中处置可能会导致意外污染。这突出表明，在建议用于促进砷挥发的厌氧处理之前，需要进行更多的研究。

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  • 来源
    《Environmental Science & Technology》 |2016年第20期|10951-10959|共9页
  • 作者

    Tara M. Webster; Raghav R. Reddy; James Y. Tan; Joy D. Van Nostrand; Jizhong Zhou; Kim F. Hayes; Lutgarde Raskin;

  • 作者单位

    Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States,Soil and Crop Sciences Department, Cornell University, Ithaca, New York 148S3, United States;

    Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States;

    Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States;

    Institute for Environmental Genomics, Department of Microbiology and Plant Biology, University of Oklahoma, Norman, Oklahoma 73019, United States;

    Institute for Environmental Genomics, Department of Microbiology and Plant Biology, University of Oklahoma, Norman, Oklahoma 73019, United States;

    Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States;

    Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, Michigan 48109, 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);
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