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Frontiers of Environmental Science & Engineering

Front. Environ. Sci. Eng.    2018, Vol. 12 Issue (3) : 12
Oxidation and biotoxicity assessment of microcystin-LR using different AOPs based on UV, O3 and H2O2
Siyi Lu, Naiyu Wang, Can Wang()
School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
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MC-LR removal performances under different AOPs were compared systematically.

Higher removal efficiency and synergistic effects were obtained by combined process.

The acute biotoxicity raised in different degrees after oxidation.

Microcystin-LR attracts attention due to its high toxicity, high concentration and high frequency. The removal characteristics of UV/H2O2 and O3/H2O2 advanced oxidation processes and their individual process for MC-LR were investigated and compared in this study. Both the removal efficiencies and rates of MC-LR as well as the biotoxicity of degradation products was analyzed. Results showed that the UV/H2O2 process and O3/H2O2 were effective methods to remove MC-LR from water, and they two performed better than UV-, O3-, H2O2-alone processes under the same conditions. The effects of UV intensity, H2O2 concentration and O3 concentration on the removal performance were explored. The synergistic effects between UV and H2O2, O3 and H2O2 were observed. UV dosage of 1800 mJ·cm2 was required to remove 90% of 100 mg·L1 MC-LR, which amount significantly decreased to 500 mJ·cm2 when 1.7 mg·L1 H2O2 was added. 0.25 mg·L1 O3, or 0.125 mg·L1 O3 with 1.7 mg·L1 H2O2 was needed to reach 90% removal efficiency. Furthermore, the biotoxicity results about these UV/H2O2, O3/H2O2 and O3-alone processes all present rising trends with oxidation degree of MC-LR. Biotoxicity of solution, equivalent to 0.01 mg·L1 Zn2+, raised to 0.05 mg·L1 Zn2+ after UV/H2O2 or O3/H2O2 reaction. This phenomenon may be attributed to the aldehydes and ketones with small molecular weight generated during reaction. Advice about the selection of MC-LR removal methods in real cases was provided.

Keywords Microcystin-LR      Advanced oxidation processes (AOPs)      Biotoxicity      Synergistic effects     
Corresponding Authors: Can Wang   
Issue Date: 21 March 2018
 Cite this article:   
Siyi Lu,Naiyu Wang,Can Wang. Oxidation and biotoxicity assessment of microcystin-LR using different AOPs based on UV, O3 and H2O2[J]. Front. Environ. Sci. Eng., 2018, 12(3): 12.
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Fig.1  Degradation of MC-LR by various AOPs ( [MC-LR]0 = 100 μg·L1; UV intensity in water surface was 1000 μW·cm2; the initial concentration of H2O2 and O3 was 1.7mg·L1 and 0.125mg·L1, respectively; initial pH=5.5±1; room temperature=25±2 °C)
Fig.2  Comparison of MC-LR removal by UV-, H2O2-alone process and their combined process ([MC-LR]0 =100 μg·L1; UV intensity in water surface was 1000 μW·cm2; [H2O2]0 = 1.7 mg·L1 )
Fig.3  Degradation of MC-LR vs time as a function of H2O2 initial concentration. ([MC-LR]0 =100 μ·L1; UV intensity in water surface was 1000 μW·cm2; H2O2 concentration was 1.7 mg·L1)
Fig.4  Degragation of MC-LR by O3-alone process ([MC-LR]0 = 100 μg·L1; [O3]0 = 0.125 mg·L1; Ozone decay curve was tested in ultrapure water)
Fig.5  (a) The residual MC-LR concentration after O3-alone or O3/H2O2 oxidation; (b) Comparison of MC-LR removal by O3-, H2O2-alone process and their combined process at 2 min reaction time. (O3 concentration was 0.025, 0.125 and 0.250 mg·L1 for 10:1, 50:1 and 100:1, in turn. The initial H2O2 concentration was 1.7mg·L1).
Fig.6  Biotoxicity of solution oxidation by UV/H2O2 process ([H2O2]0 =0.34, 1.7, 3.4mg·L1, in turn; UV intensity was 1000 μW·cm2; control: biotoxicity of 100 μg·L1 MC-LR)
Fig.7  Biotoxicity of solution oxidation by (a) O3-alone process , (b) O3/H2O2 process ([O3]0=0.025, 0.125, 0.250 mg·L1, in turn; [H2O2]0=1.7 mg·L1; control: biotoxicity of 100 μg·L1 MC-LR; All of the biotoxicity tests were conducted after reaction time of 60 min)
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