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Article

Kinetics of Microcystin-LR Removal in a Real Lake Water by UV/H2O2 Treatment and Analysis of Specific Energy Consumption

1
Department of Civil, Environmental, Architectural Engineering and Mathematics, University of Brescia, 25123 Brescia, Italy
2
Department of Civil Engineering and Architecture, University of Pavia, 27100 Pavia, Italy
3
Interdepartmental Centre for Water Research, University of Pavia, 27100 Pavia, Italy
*
Author to whom correspondence should be addressed.
Received: 24 November 2020 / Revised: 16 December 2020 / Accepted: 18 December 2020 / Published: 21 December 2020
(This article belongs to the Special Issue Removal of Cyanobacteria and Cyanotoxins in Waters)
The hepatotoxin microcystin-LR (MC-LR) represents one of the most toxic cyanotoxins for human health. Considering its harmful effect, the World Health Organization recommended a limit in drinking water (DW) of 1 µg L−1. Due to the ineffectiveness of conventional treatments present in DW treatment plants against MC-LR, advanced oxidation processes (AOPs) are gaining interest due to the high redox potential of the OH radicals. In this work UV/H2O2 was applied to a real lake water to remove MC-LR. The kinetics of the UV/H2O2 were compared with those of UV and H2O2 showing the following result: UV/H2O2 > UV > H2O2. Within the range of H2O2 tested (0–0.9 mM), the results showed that H2O2 concentration and the removal kinetics followed an increasing quadratic relation. By increasing the initial concentration of H2O2, the consumption of oxidant also increased but, in terms of MC-LR degraded for H2O2 dosed, the removal efficiency decreased. As the initial MC-LR initial concentration increased, the removal kinetics increased up to a limit concentration (80 µg L−1) in which the presence of high amounts of the toxin slowed down the process. Operating with UV fluence lower than 950 mJ cm−2, UV alone minimized the specific energy consumption required. UV/H2O2 (0.3 mM) and UV/H2O2 (0.9 mM) were the most advantageous combination when operating with UV fluence of 950–1400 mJ cm−2 and higher than 1400 mJ cm−2, respectively. View Full-Text
Keywords: cyanobacteria; cyanotoxins; drinking water; AOPs; hydrogen peroxide; algal bloom; microcystin-LR cyanobacteria; cyanotoxins; drinking water; AOPs; hydrogen peroxide; algal bloom; microcystin-LR
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MDPI and ACS Style

Sorlini, S.; Collivignarelli, C.; Carnevale Miino, M.; Caccamo, F.M.; Collivignarelli, M.C. Kinetics of Microcystin-LR Removal in a Real Lake Water by UV/H2O2 Treatment and Analysis of Specific Energy Consumption. Toxins 2020, 12, 810. https://0-doi-org.brum.beds.ac.uk/10.3390/toxins12120810

AMA Style

Sorlini S, Collivignarelli C, Carnevale Miino M, Caccamo FM, Collivignarelli MC. Kinetics of Microcystin-LR Removal in a Real Lake Water by UV/H2O2 Treatment and Analysis of Specific Energy Consumption. Toxins. 2020; 12(12):810. https://0-doi-org.brum.beds.ac.uk/10.3390/toxins12120810

Chicago/Turabian Style

Sorlini, Sabrina, Carlo Collivignarelli, Marco Carnevale Miino, Francesca M. Caccamo, and Maria C. Collivignarelli 2020. "Kinetics of Microcystin-LR Removal in a Real Lake Water by UV/H2O2 Treatment and Analysis of Specific Energy Consumption" Toxins 12, no. 12: 810. https://0-doi-org.brum.beds.ac.uk/10.3390/toxins12120810

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