Arsenite to Arsenate Oxidation and Water Disinfection via Solar Heterogeneous Photocatalysis: A Kinetic and Statistical Approach

Arsenic (As) poses a threat to human health. In 2014, more than 200 million people faced arsenic exposure through drinking water, as estimated by the World Health Organization. Additionally, it is estimated that drinking water with proper microbiological quality is unavailable for more than 1 billio...

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Bibliographic Details
Published in:Water (Basel) 2022-08, Vol.14 (15), p.2450
Main Authors: Silerio-Vázquez, Felipe de J., Núñez-Núñez, Cynthia M., Proal-Nájera, José B., Alarcón-Herrera, María T.
Format: Article
Language:English
Subjects:
Arsenates
Arsenic
Arsenite
Chemical precipitation
Coliforms
Developing countries
Disinfection
Drinking water
Experiments
Flat plates
Groundwater
Health risks
Hydrogen peroxide
Independent variables
Irradiation
LDCs
Light irradiation
Oxidation
Photocatalysis
Photooxidation
Pollutant removal
Pollutants
Radiation
Reactors
Statistical analysis
Water quality
Water treatment
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Summary:Arsenic (As) poses a threat to human health. In 2014, more than 200 million people faced arsenic exposure through drinking water, as estimated by the World Health Organization. Additionally, it is estimated that drinking water with proper microbiological quality is unavailable for more than 1 billion people. The present work analyzed a solar heterogeneous photocatalytic (HP) process for arsenite (AsIII) oxidation and coliform disinfection from a real groundwater matrix employing two reactors, a flat plate reactor (FPR) and a compound parabolic collector (CPC), with and without added hydrogen peroxide (H2O2). The pseudo first-order reaction model fitted well to the As oxidation data. The treatments FPR–HP + H2O2 and CPC–HP + H2O2 yielded the best oxidation rates, which were over 90%. These treatments also exhibited the highest reaction rate constants, 6.7 × 10−3 min−1 and 6.8 × 10−3 min−1, respectively. The arsenic removal rates via chemical precipitation reached 98.6% and 98.7% for these treatments. Additionally, no coliforms were detected at the end of the process. The collector area per order (ACO) for HP treatments was on average 75% more efficient than photooxidation (PO) treatments. The effects of the process independent variables, H2O2 addition, and light irradiation were statistically significant for the AsIII oxidation reaction rate (p < 0.05).
ISSN:2073-4441
2073-4441
DOI:10.3390/w14152450