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Author(s): Carmen Rodrigues
Ricardo A.C. Borges
Vanessa N. Lima
Luis Madeira
Title: p-Nitrophenol degradation by Fenton's oxidation in a bubble column reactor
Issue Date: 2018
Abstract: The use of the air stream aimed to provide perfect mixing in the liquid phase, which was successfullyachieved and checked experimentally; there were no concentration gradients along the column, even at the lowest air flow rate used (Q Œ 1 mL/min at room temperature and atmospheric pressure). The effect of the operating variables was assessed, and a total reduction of PNP was reached, as well as mineralization of 49.2%, oxidant consumption of 90.3%, and with an efficiency of use - hH2O2 - of 0.09 mg C/mg H2O2, under the best operating conditions found - Q Œ 1 mL/min, [H2O2] Œ 1.6 g/L, [Fe2+] = 80 mg/L, pH = 3.0 and T = 22e24 C - (after 120 min of reaction). Following this, various strategies were developed for improving the mineralization rate; it was found that the addition of H2O2 every 5 min and readjusting the pH after 30 min of reaction allow the attainment of a much higher TOC removal (75.1%) and efficiency of oxidant use (hH2O2 Œ 0.17 mg C/mg H2O2) with less oxidant. A reaction mechanism was proposed, based on intermediates identified that include p-nitrocatechol - PNC, p-benzoquinone - PB, hydroquinone - HQ - and carboxylic acids (oxalic, maleic and fumaric). Since the performance achieved in the BCR was good, and very similar to that obtained in a conventional batch reactor, it was possible to verify the efficacy of carrying out the Fenton process in this reactor configuration, which in our future work will focus on the treatability of industrial effluents.
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projetos Estratégicos/UID/EQU/00511/2013 - POCI-01-0145-FEDER-006939/Laboratório de Engenharia de Processos, Ambiente, Biotecnologia e Energia/LEPABE
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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