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首页> 外文期刊>Environmental Science & Technology >Removal of Arsenic from Strongly Acidic Wastewater Using Phosphorus Pentasulfide As Precipitant: UV-Light Promoted Sulfuration Reaction and Particle Aggregation
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Removal of Arsenic from Strongly Acidic Wastewater Using Phosphorus Pentasulfide As Precipitant: UV-Light Promoted Sulfuration Reaction and Particle Aggregation

机译:五硫化二磷为沉淀剂从强酸性废水中去除砷的研究:紫外光促进的硫化反应和颗粒聚集

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摘要

Strongly acidic wastewater (H_(2)SO_(4)) with a high arsenic concentration is produced by many industries. The removal of arsenic by traditional sulfide (e.g., Na_(2)S, FeS) from strongly acidic wastewater introduces cations (Na~(+) and Fe~(2+)) to the solution, which may prevent the recycle of acid. In this study, a new sulfuration agent, phosphorus pentasulfide (P_(2)S_(5)) was employed, and its feasibility in arsenic removal from strongly acidic wastewater was investigated. In the dark, As(III) was efficiently removed, but the removal rate of As(V) was rather slow, which was the crucial defect for this method. We found that this defect can be efficiently overcome by UV irradiation through accelerating the formation and transformation of an intermediate species, monothioarsenate (H_(3)AsO_(3)S) in the As(V) removal process. In addition, the hydrolysis of P_(2)S_(5) was enhanced under UV irradiation, which resulted in the increase of the arsenic removal efficiencies. Besides, the aggregation of the formed particles was also promoted. Different from FeS and Na_(2)S, P_(2)S_(5) introduces H_(3)PO_(4) instead of cations to the solution, which can facilitate the recycle and reuse of arsenic and acid in strongly acidic wastewater.
机译:许多行业产生砷含量高的强酸性废水(H_(2)SO_(4))。从强酸性废水中通过传统的硫化物(例如Na_(2)S,FeS)去除砷会将阳离子(Na〜(+)和Fe〜(2+))引入溶液中,这可能会阻止酸的再循环。在这项研究中,使用了一种新的硫化剂五硫化二磷(P_(2)S_(5)),并研究了其在强酸性废水中除砷的可行性。在黑暗中有效去除了As(III),但是As(V)的去除速度却很慢,这是该方法的关键缺陷。我们发现该缺陷可以通过加速As(V)去除过程中的中间物种一硫代砷酸盐(H_(3)AsO_(3)S)的形成和转化来有效克服。此外,P_(2)S_(5)的水解在紫外线照射下得到增强,从而提高了砷的去除效率。此外,还促进了所形成的颗粒的聚集。 P_(2)S_(5)与FeS和Na_(2)S不同,它向溶液中引入H_(3)PO_(4)而不是阳离子,这可以促进强酸性废水中砷和酸的回收和再利用。

著录项

  • 来源
    《Environmental Science & Technology》 |2018年第8期|4794-4801|共8页
  • 作者单位

    National Engineering Laboratory for Industrial Wastewater Treatment, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China,Beijing Key Laboratory of Industrial Wastewater Treatment and Resource Recovery, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China,University of Chinese Academy of Sciences, Beijing 100049, China;

    National Engineering Laboratory for Industrial Wastewater Treatment, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China,Beijing Key Laboratory of Industrial Wastewater Treatment and Resource Recovery, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China,University of Chinese Academy of Sciences, Beijing 100049, China;

    National Engineering Laboratory for Industrial Wastewater Treatment, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China,Beijing Key Laboratory of Industrial Wastewater Treatment and Resource Recovery, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

    National Engineering Laboratory for Industrial Wastewater Treatment, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China,Beijing Key Laboratory of Industrial Wastewater Treatment and Resource Recovery, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

  • 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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  • 正文语种 eng
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