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- Title
Degradation of Organic Carbon in Pharmaceutical Wastewater: a Kinetic Approach.
- Authors
Izário Filho, Hélcio José; Aguiar, Leandro G.; Siqueira, Adriano Francisco; Alcântara, Marco Aurélio Kondracki; Da Rós, Patrícia Caroline Molgero; Rocha, Robson Silva; Napoleão, Diovana Aparecida Santos; Brandão, Joaquim Joffre
- Abstract
This study aimed to investigate the degradation kinetics of the total organic carbon (TOC) in real pharmaceutical wastewater. Because of the complexity of real wastewaters and the lack of knowledge on all reactions involved in their chemical degradation, the use of a kinetic approach becomes difficult. To overcome this difficulty, we adopted a kinetic model based on chemical equations validated for mechanisms of free radical generation. Photo-Fenton reactions were performed in a 1-L tubular reactor. The developed model satisfactorily described the degradation kinetics of TOC in wastewater, with an R2 of 0.9997. The TOC degradation rate constant (kd) was estimated at 1 × 1011 L2 mol2 s−1, in agreement with literature values for the degradation kinetics of organic compounds. UV radiation had a positive effect on degradation, contributing to HO• formation. The adopted mathematical approach was highly sensitive to the formation rate constant of HO• from H2O2 (k4). By assuming the reaction to follow variable order kinetics (β = 1 and β = 2), it was possible to improve the goodness of fit of the model. Our results suggest, albeit in an incipient way, that the approach used in this study can be extended to the kinetic understanding of other complex wastewaters.
- Subjects
SEWAGE; STABILITY constants; CHEMICAL equations; CHEMICAL reactions; CHEMICAL decomposition; FREE radicals
- Publication
Water, Air & Soil Pollution, 2021, Vol 232, Issue 3, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-021-05039-w