Environmental Chemistry

ISSN 0254-6108

CN 11-1844/X

Vol. 38 No. 5
May  2019
Article Contents

Citation:

Effects of PM and PM/BS on the degradation of metribuzin and the formation potential of disinfection by-products

  • Received Date: 2018-10-16
    Fund Project:

    Supported by the National Natural Science Foundation of China(51525806)and Major Science and Technology Program for Water Pollution Control and Treatment(2017ZX07207-004).

  • This paper investigated the effects of potassium permanganate/sodium bisulfite (PM/BS) on the degradation of pesticide metribuzin (MET) under different pH conditions, and the changes and toxicity evaluation of disinfection by-products (DBPs) during oxidation and subsequent chlorination. At the same time, potassium permanganate (PM) was used as a control group. Results showed that PM/BS pre-oxidation increased the degradation efficiency of MET compared with PM pre-oxidation. In the two pre-oxidation processes, the degradation efficiency of MET was the largest under acidic conditions and decreased with the increase of pH, while the formation potential and toxicity of DBPs increased with the increase of pH. It is worth noting that the degradation efficiency under alkaline conditions was low, and a large amount of dichloroacetonitrile was formed, which leads to a large increase in the formation potential and toxicity of DBPs. The reasons for this phenomenon were discussed in detail. Finally, it was concluded that the degradation of pollutants in the PM/BS system needs to be controlled under acidic conditions, which can increase the degradation efficiency and reduce the toxicity of DBPs.
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    [6] 孙波. NaHSO3活化KMnO4快速氧化水中微量有机污染物的效能与机理[D]. 哈尔滨:哈尔滨工业大学,2017. SUN B. Kinetics and mechanisms on the fast degradation of Micro-Organic contaminants by bisulfite activated permanganate[D]. Harbin:Harbin Institute of Technology, 2017(in Chinese).
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    [12] WANG A Q, LIN Y L, XU B, et al. Degradation of acrylamide during chlorination as a precursor of haloacetonitriles and haloacetamides[J]. Science of the Total Environment, 2018, 615:38-46.
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    [14] DING S, CHU W, BOND T, et al. Formation and estimated toxicity of trihalomethanes, haloacetonitriles, and haloacetamides from the chlor (am) ination of acetaminophen[J]. Journal of Hazardous Materials, 2018, 341:112-119.
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Effects of PM and PM/BS on the degradation of metribuzin and the formation potential of disinfection by-products

  • 1. Beijing Climate Change Response Research and Education Center, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China;
  • 2. Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
Fund Project:  Supported by the National Natural Science Foundation of China(51525806)and Major Science and Technology Program for Water Pollution Control and Treatment(2017ZX07207-004).

Abstract: This paper investigated the effects of potassium permanganate/sodium bisulfite (PM/BS) on the degradation of pesticide metribuzin (MET) under different pH conditions, and the changes and toxicity evaluation of disinfection by-products (DBPs) during oxidation and subsequent chlorination. At the same time, potassium permanganate (PM) was used as a control group. Results showed that PM/BS pre-oxidation increased the degradation efficiency of MET compared with PM pre-oxidation. In the two pre-oxidation processes, the degradation efficiency of MET was the largest under acidic conditions and decreased with the increase of pH, while the formation potential and toxicity of DBPs increased with the increase of pH. It is worth noting that the degradation efficiency under alkaline conditions was low, and a large amount of dichloroacetonitrile was formed, which leads to a large increase in the formation potential and toxicity of DBPs. The reasons for this phenomenon were discussed in detail. Finally, it was concluded that the degradation of pollutants in the PM/BS system needs to be controlled under acidic conditions, which can increase the degradation efficiency and reduce the toxicity of DBPs.

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