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Rapid removal of polyacrylamide from wastewater by plasma in the gas–liquid interface

论文摘要

Due to the severe restrictions imposed by legislative frameworks, the removal of polyacrylamide（PAM） rapidly and effectively from produced wastewater in offshore oilfields before discharge is becoming an urgent challenge. In this study, a novel advanced oxidation process based on plasma operated in the gas–liquid interface was used to rapidly decompose PAM, and multiple methods including viscometry, flow field-flow fractionation multi-angle light scattering, UV–visible spectroscopy, and attenuated total reflectanceFourier transform infrared spectroscopy were used to characterize the changes of PAM.Under a discharge voltage of 25 kV and pH 7.0, the PAM concentration decreased from 100 to 0 mg/L within 20 min and the total organic carbon（TOC） decreased from 49.57 to1.23 mg/L within 240 min, following zero-order reaction kinetics. Even in the presence of background TOC as high as 152.2 mg/L, complete removal of PAM（100 mg/L） was also achieved within 30 min. The biodegradability of PAM improved following plasma treatment for 120 min. Active species（such as O3 and H2O2） were produced in the plasma. Hydroxyl radical was demonstrated to play an important role in the degradation of PAM due to the inhibitory effect observed after the addition of an ·OH scavenger, Na2CO3. Meanwhile, the release of ammonia and nitrate nitrogen confirmed the cleavage of the acylamino group.The results of this study demonstrated that plasma, with its high efficiency and chemicalfree features, is a promising technology for the rapid removal of PAM.

论文目录

  • Introduction
  • 1. Materials and methods
  •   1.1. Experimental setup
  •   1.2. Biodegradability test
  •   1.3. Analytical methods
  • 2. Results and discussion
  •   2.1. Plasma efficacy for prepared PAM solutions
  •   2.2. Plasma efficacy with co-existing pollutants and biode-gradability after plasma treatment
  •   2.3. Key active species and comparison with ozonation
  •   2.4. PAM decomposition pathway
  • 3. Conclusions

    • 文章来源

    类型: 期刊论文

    作者: Wenzhe Song,Yu Zhang,Jianwei Yu,Yingxin Gao,Teruki Naitoc,Gaku Oinumac,Yasutaka Inanagac,Min Yang

    来源: Journal of Environmental Sciences 2019年09期

    年度: 2019

    分类: 工程科技Ⅰ辑

    专业: 环境科学与资源利用

    单位: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences,University of Chinese Academy of Sciences,Advanced Technology R&D Center, Mitsubishi Electric Corporation

    基金: supported by National Natural Scientific Foundation of China(No.2159081),the Ministry of Science and Technology,People’s Republic of China(No.2012AA063401)

    分类号: X703

    页码: 1-7

    总页数: 7

    文件大小: 697K

    下载量: 27

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