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首页> 外文期刊>Water Research >Ozone-encapsulated colloidal gas aphrons for in situ and targeting remediation of phenanthrene-contaminated sediment-aquifer
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Ozone-encapsulated colloidal gas aphrons for in situ and targeting remediation of phenanthrene-contaminated sediment-aquifer

机译：臭氧封装的胶体气体，用于原位和靶向菲利污染沉积物 - 含水层的修复

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摘要

The hydrophobic polycyclic aromatic hydrocarbons (PAHs) are apt to adhere tightly to the sediments in aquifer and thus pose great threats to the aquatic environment of groundwater and surface water as well as human health. The present study constructed functionalized microbubbles, named colloidal ozone aphrons (COAs), by dissolving ozone-contained air into the nonionic surfactant (Tween-20) solution at the pressure of 300 kPa for the in situ remediation of phenanthrene (PHE)-contaminated sediments. The COA system aimed at improving the PHE elimination in terms of (i) enhancing the migration and transpor tation ability of the bubble system in the contaminated aquifer matrix, (ii) accurately desorbing the target hydrophobic contaminants from sediments, and (iii) reinforcing the in situ oxidation degradation immediately after or simultaneously when the PAHs are desorbed into the aqueous phase. Experimental results demonstrated that the COAs exhibited similar characteristics as the classical colloidal gas aphrons (CGAs), including the high stability (half-life time 200 s), typical morphology and average bubble size ( 114-162 mu m); higher air hold-up of COAs was achieved (i. e. 20%) compared with the air-microbubbles (1-2%) obtained under the same generation conditions. Although the encapsulated ozone could oxidize the surfactant-layers, the properties and behaviors of COAs were not greatly affected. The surfactant multi-layers endowed the COAs with strong hydrophobic attraction with PHE, great migration capacity and enlarged oxidation area in the sediment matrix. Approximately 96.9% of PHE was removed from the sediments and 84.9% of the overall PHE was oxidized at the high ozone concentration of 0.6 mg/L when the initial PHE concentration was 240.0 mu g/kg. The COA-involved remediation technology provided the insight of combining the processes of washing and oxidizing through adopting the particularly conceived microbubbles. The in situ and selective removal of hydrophobic organic contaminants from sediments in aquifer was well achieved in this study. (C) 2019 Elsevier Ltd. All rights reserved.
机译：疏水性多环芳烃（PAHS）易于紧紧地粘附到含水层中的沉积物中，从而对地下水和地表水的水生环境以及人类健康构成了巨大威胁。本研究通过将含臭氧的空气溶解到非离子表面活性剂（Tween-20）溶液以300kPa的压力下，通过将臭氧的空气溶解到非离子表面活性剂（Tween-20）溶液中，构成官能化微泡（COA），用于在300kPa的压力下进行膦（phe） - 酰胺沉积物的原位修复。旨在改善（i）提高泡沫系统在受污染的含水层基质中的迁移和转孢菌能的能力，（ii）精确地解吸来自沉积物的靶疏水性污染物，（iii）加强（iii）的迁移和转运能力当PAH被解吸到水相中时，在原位氧化降解或同时进行降解。实验结果表明，COA表现出与典型胶体气体蚜（CGA）相似的特征，包括高稳定性（半衰期> 200秒），典型的形态和平均气泡尺寸（114-162μm）;与在相同的一代条件下获得的空气微泡（1-2％）相比，实现了储存的较高空气升压（即> 20％）。虽然包封的臭氧可以氧化表面活性剂层，但COA的性质和行为没有大受影响。表面活性剂多层具有强大的疏水吸引力，沉积物基质中具有强烈的疏水吸引力，沉积物基质的扩大氧化区域。从沉积物中除去大约96.9％的pHE，当初始PHE浓度为240.0μmg/ kg时，将84.9％的总pHE氧化在0.6mg / L的高臭氧浓度下。 CoA涉及的修复技术提供了通过采用特别设想的微泡来组合洗涤和氧化过程的洞察。本研究中，原位和选择性地除去含水层沉积物的疏水性有机污染物。 （c）2019 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Water Research》 |2019年第1期|29-38|共10页
  • 作者

    Zhang Ming; Feng Yudong; Zhang Daoyong; Dong Lingfeng; Pan Xiangliang;

  • 作者单位

    Zhejiang Univ Technol Key Lab Microbial Technol Ind Pollut Control Zhej Coll Environm Hangzhou 310014 Zhejiang Peoples R China;

    Zhejiang Univ Technol Key Lab Microbial Technol Ind Pollut Control Zhej Coll Environm Hangzhou 310014 Zhejiang Peoples R China;

    Zhejiang Univ Technol Key Lab Microbial Technol Ind Pollut Control Zhej Coll Environm Hangzhou 310014 Zhejiang Peoples R China;

    Zhejiang Univ Technol Key Lab Microbial Technol Ind Pollut Control Zhej Coll Environm Hangzhou 310014 Zhejiang Peoples R China;

    Zhejiang Univ Technol Key Lab Microbial Technol Ind Pollut Control Zhej Coll Environm Hangzhou 310014 Zhejiang Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Microbubble functionalization; Colloidal zone aphrons; In situ contaminant-targeting remediation;

    机译：微泡官能化;胶体区蚜;原位污染物靶向修复;

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