Abstract
A dynamic kinetic model is presented for the UVC/H2O2-driven process. The model comprises 103 reactions, including background species, such as HCO3–/CO32–, NO2–, NO3–, SO42−, Cl−, and H2PO4−/HPO42/PO43– anions, and effluent organic matter (EfOM) was validated based on experimental data obtained for the photooxidation of the nonribosomal peptide antibiotic zinc bacitracin (Zn-Bc, 34 μmol L−1). The set of ordinary differential equations for 38 species was combined with the molar balances describing the recirculating tubular photoreactor used. Predictions for the photolytic and UVC/H2O2 processes confirmed the good agreement with experimental data, enabling the estimation of fundamental kinetic parameters, such as the direct photolysis quantum yield (Ф254 nm, Zn-Bc = 0.0143 mol Einstein−1) and the second-order rate constants for the reactions of Zn-Bc with HO•, HO2•, and O2•− radicals (2.64 × 109, 1.63 × 103, and 1.49 × 104 L mol−1 s−1, respectively). The predicted optimum process conditions correspond to [H2O2]0 = 6.8 mmol L−1 and a specific photon emission rate of 11.1 × 10−6 Einstein L−1 s−1. Zn-Bc photooxidation was significantly impacted by wastewater constituents, particularly EfOM and HCO3–/CO32– (i.e., alkalinity), resulting in a degradation rate about 32% lower compared to that obtained in deionized water. In particular, EfOM acts as a strong radical scavenger and inner filter. In addition, simulations pointed out the continuous tubular photochemical reactor as the best configuration for treating Zn-Bc-containing wastewater. This study hence provides a comprehensive modeling approach, especially useful for predicting the effect of complex water matrices on the performance of the UVC/H2O2 treatment process.
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Abbreviations
- AOT:
-
advanced oxidation technologies
- CSTR:
-
continuous stirred-tank reactor
- EfOM:
-
wastewater effluent organic matter
- FVM:
-
finite volume method
- NRP:
-
nonribosomal peptides
- ODE:
-
ordinary differential equation
- PFR:
-
plug flow reactor
- PROD1:
-
dissolved organic products generated from Zn-Bc degradation
- PROD2:
-
dissolved organic products generated from EfOM degradation
- RTD:
-
residence time distribution
- SUVA:
-
specific UV absorption
- TOC:
-
total organic carbon
- UVC:
-
ultraviolet radiation (254 nm)
- WWTP:
-
wastewater treatment plant
- Zn-Bc:
-
zinc bacitracin
- Abs254 nm :
-
total absorbance of the solution at 254 nm
- [C]:
-
molar concentration of the species C (mol L−1)
- [C]0 :
-
initial molar concentration of the species C (mol L−1)
- E P,0 :
-
specific photon emission rate (μmol photons L−1 s−1)
- k :
-
reaction rate constant (L mol−1 s−1 or s−1)
- ka:
-
acid-base equilibrium constant
- k global :
-
global reaction rate constant (s−1)
- k Zn-Bc, HO • :
-
second-order reaction rate constant of Zn-Bc with hydroxyl radical (L mol−1 s−1)
- \( {k}_{\mathrm{Zn}-\mathrm{Bc},\kern0.75em \mathrm{H}{\mathrm{O}}_2^{\bullet }} \) :
-
second-order reaction rate constant of Zn-Bc with hydroperoxyl radical (L mol−1 s−1)
- \( {k}_{\mathrm{Zn}-\mathrm{Bc},\kern0.75em {\mathrm{O}}_2^{\bullet -}} \) :
-
second-order reaction rate constants of Zn-Bc with superoxide radical anion (L mol−1 s−1)
- l reactor :
-
reactor path length (m)
- n :
-
number of the compartment where the reaction occurs: 1 (CSTR 2) and 2 (PFR)
- r :
-
reaction rate term (mol L−1 s−1)
- t :
-
time (s)
- UVA254 :
-
decadic UV absorption coefficient at 254 nm (cm−1)
- UVA310 :
-
decadic UV absorption coefficient at 310 nm (cm−1)
- V :
-
volume (L)
- V T :
-
volume of the recirculating tank (L)
- V r :
-
volume of the annular tubular photoreactor (L)
- v :
-
flow rate (L s−1)
- ε :
-
molar absorption coefficient (L mol−1 m−1)
- Ф :
-
photolysis quantum yield (mol Einstein−1)
- τ :
-
residence time (s)
- ε :
-
molar absorption coefficient (L mol−1 m−1)
- Ф :
-
photolysis quantum yield (mol Einstein−1)
- τ :
-
residence time (s)
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Funding
This study was funded by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) - Finance Code 001 and National Council for Scientific and Technological Development (CNPq) (grant # 131210/2016-5).
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P.M.: conceptualization, formal analysis, investigation, methodology, software, validation, visualization, writing—original draft, writing—review and editing. A.C.S.C.T.: conceptualization, formal analysis, validation, resources, writing—original draft, writing—review and editing, supervision, funding acquisition. All authors read and approved the final manuscript.
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Metolina, P., Teixeira, A.C.S.C. A comprehensive dynamic kinetic model for the UVC/H2O2 process: application to zinc bacitracin degradation in wastewater as a case study. Environ Sci Pollut Res 28, 24150–24166 (2021). https://doi.org/10.1007/s11356-021-12437-4
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DOI: https://doi.org/10.1007/s11356-021-12437-4