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Frontiers of Environmental Science & Engineering

Front. Environ. Sci. Eng.    2019, Vol. 13 Issue (3) : 33
Degradation of metronidazole by dielectric barrier discharge in an aqueous solution
Zhipeng Yang1,2, Anxing Lai1, Hangyu Chen1, Youxiang Yan2, Ye Yang1, Weiwei Zhang1,2, Lei Wang1()
1. College of Environmental Science & Engineering, Xiamen University of Technology, Xiamen 361024, China
2. State Grid Xiamen Electric Power Supply Company, Xiamen 361006, China
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The discharge characteristics during the degradation of MNZ by DBD were investigated.

Increasing the discharge frequency can promote the degradation of MNZ.

MNZ removal reaches 99.1% at the initial concentration of 40 ppm within 120 min.

Coexisting organic matter inhibits the degradation of MNZ.

The energy efficiency of DBD for MNZ removal is higher than other technologies.

Degradation of metronidazole (MNZ) which is a representative and stable antibiotic by dielectric barrier discharge (DBD) in an aqueous solution has been studied. Effects of initial MNZ concentration, solution pH and coexisting organics on the degradation were investigated. The results illustrated that increasing the input power and the discharge frequency can improve the removal of MNZ. At low initial concentration, the removal of MNZ can reach up to 99.1%. Acidic and neutral conditions are more favorable for MNZ removal than alkaline condition in the early stage of degradation. However, the difference in MNZ removal between those in acidic or neutral media and that in alkaline one could be neglected with prolonging of the treatment time. Therefore, this method can be applied to MNZ degradation with a wide pH range. Coexisting organic matter in water can attenuate the removal to some extent. This study could provide valuable references for the degradation of nitroimidazole antibiotics by DBD.

Keywords Dielectric barrier discharge      Antibiotic      Metronidazole      Water treatment     
This article is part of themed collection: Environmental Antibiotics and Antibiotic Resistance (Xin Yu, Hui Li & Virender K. Sharma)
Corresponding Authors: Lei Wang   
Just Accepted Date: 10 April 2019   Issue Date: 13 May 2019
 Cite this article:   
Zhipeng Yang,Anxing Lai,Hangyu Chen, et al. Degradation of metronidazole by dielectric barrier discharge in an aqueous solution[J]. Front. Environ. Sci. Eng., 2019, 13(3): 33.
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Zhipeng Yang
Anxing Lai
Hangyu Chen
Youxiang Yan
Ye Yang
Weiwei Zhang
Lei Wang
Fig.1  Device of DBD for MNZ treatment.
Fig.2  Waveforms of the voltage and current of the DBD (input power, 51 W; solution volume, 500 mL).
Fig.3  Lissajous-Figure of DBD (input power, 51 W; C0 = 0.47 P; discharge frequency, 10 kHz)
Fig.4  Emission spectra of DBD in MNZ solution (input power, 51 W; volume, 500 mL).
Fig.5  MNZ removal under 50 Hz and 10 kHz (discharge time, 60 min; initial concentration, 100 mg/L).
Fig.6  MNZ removal under different initial concentrations (input power, 51 W; discharge frequency, 10 kHz, discharge time, 120min; pH0, 7.0).
Fig.7  Arc of DBD (input power, 51 W; discharge frequency, (a) 10 kHz, (b) 50 Hz).
Fig.8  Removal of MNZ under different pH (a) and the pH changes of solution during degradation process (b) (input power, 51 W; discharge frequency, 10 kHz; initial MNZ concentration, 40 mg/L).
Fig.9  Removal of MNZ with different IPA concentrations (input power, 51 W; discharge frequency, 10 kHz; initial concentrations, 40 mg/L; pH0, 7.0).
Fig.10  UV-visible absorption spectra of DBD process (input power, 51 W; discharge frequency, 10 kHz; initial concentrations, 40 mg/L).
C0(mg/L) Method JMNZ (mg/J) References
40.0 DBD 51W, pH0 7.0, f 10 kHz 1.089 × 10-4 This work
100.0 DBD 51W, pH0 7.0, f 50 Hz 0.588 × 10-4 This work
34.4 RFD 110W, pH0 5.6 0.75 × 10-5 Wang et al. (2017b)
10.0 Ozonation, pH0 2.0 0.63 × 10-5 Sánchez-Polo et al. (2008)
40.0 TiO2 photocatalysis,125 W, pH0 5.2 0.47 × 10-5 Bazrafshan et al. (2015)
Tab.1  Energy efficiency of MNZ removal by DBD and other methods
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