Abstract
A combined system employing photochemical oxidation (UV/H2O2) and adsorption for arsenic removal from water was designed and evaluated. In this work, a bench-scale photochemical annular reactor was developed being connected alternately to a pair of adsorption columns filled with titanium dioxide (TiO2) and granular ferric hydroxide (GFH). The experiences were performed by varying the relation of As concentration (As (III)/As (V) weight ratio) at constant hydrogen peroxide concentration and incident radiation. Experimental oxidation results were compared with theoretical predictions using an intrinsic kinetic model previously obtained. In addition, the effectiveness of the process was evaluated using a groundwater sample. The mathematical model of the entire system was developed. It could be used as an effective tool for the design and prediction of the behaviour of these types of systems. The combined technology is efficient and promising for arsenic removal to small and medium scale.
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Abbreviations
- A t :
-
Cross-section area, cm2
- C i :
-
Concentration of the species, mol cm−3
- e a P, λ :
-
Local volumetric rate of photon absorption (LVRPA), Einstein cm−3 s−1
- E λ P,o :
-
Spectral fluence rate, Einstein cm−2 s−1
- E λ P,o,W :
-
Spectral fluence rate at the inner wall, Einstein cm−2 s−1
- EBRT:
-
Empty bed residence time, s
- K 27 :
-
Kinetic parameter
- L R :
-
Reactor length, cm
- L L :
-
Lamp length, cm
- Q :
-
Flow rate, cm3 s−1
- Q r :
-
Recirculation flow rate, cm3 s−1
- Q R :
-
Reactor flow rate, cm3 s−1
- R :
-
Reaction rate, mol cm−3 s−1
- r :
-
Weight concentration ratio; also radial coordinate, cm
- r L :
-
Lamp radius, cm
- r i :
-
Inner radius, cm
- r o :
-
Outer radius, cm
- r r :
-
Recycle ratio
- s :
-
Lineal coordinate in Ω direction, cm
- t :
-
Time, s
- X i :
-
Conversion, %
- Y w :
-
Medium value of the transmittance for the reactor wall
- z :
-
Axial coordinate, cm
- Z :
-
Column height, cm
- α λ,P :
-
Spectral linear naperian absorption coefficient of the hydrogen peroxide, cm−1
- K p,λ :
-
Molar naperian absorption coefficient, cm2 mol−1
- λ :
-
Wavelength, nm
- υ z :
-
Axial fluid velocity inside the reactor, cm s−1
- θ :
-
Spherical coordinate, rad
- Φ p :
-
Primary quantum yield
- φ :
-
Spherical coordinate, rad
- \( \underset{\bar{\mkern6mu}}{\varOmega } \) :
-
Unit vector in the direction of radiation propagation
- Ψ :
-
Geometric factor
- 〈 〉:
-
Averaged value over a defined space
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Acknowledgments
The authors are grateful to Universidad Nacional del Litoral (UNL), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT) for the financial support. They also thank Ing. Susana Gervasio for her valuable help in several steps of the analytical work.
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Lescano, M., Zalazar, C. & Brandi, R. Arsenic removal from water employing a combined system: photooxidation and adsorption. Environ Sci Pollut Res 22, 3865–3875 (2015). https://doi.org/10.1007/s11356-014-3280-2
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DOI: https://doi.org/10.1007/s11356-014-3280-2