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Title4-NITROPHENOL BIODEGRADATION IN A SEQUENCING BATCH REACTOR OPERATING WITH AEROBIC-ANOXIC CYCLES
AbstractThe study regards 4-nitrophenol removal performed in a lab-scale sequential batch reactor with an integrated aerobic-anoxic cycle. The purpose of the study was to examine the kinetics of 4-nitrophenol biological oxidation and denitrification in order to test the feasibility of the proposed technological solution for xenobiotic removal. The results obtained show that high removal efficiency of 4-nitrophenol is easily achieved when the compound is fed into the reactor as the sole carbon source. Residual concentrations of 4-nitrophenol and nitrous/nitric nitrogen in the effluent lower than 1 mg L-1 were observed in the range of applied feed concentration (200-320 mg L-1). Low concentrations of dissolved oxygen (e2 mg L-1) in the feed and aerobic phases lead to appreciable simultaneous denitrification. As regards the denitrification process, while no carbonlimiting effects were observed at COD/N ratios g 3, a significant decrease in the rate of denitrification is detected for COD/N ratios e 2. The denitrification rate obtained in tests with no external carbon addition proved very low and unsuitable for practical application. A model of the denitrification process taking into account both the limiting effect of nitrogen and carbonaceous substrate has been proposed and applied for experimental data correlation.
SourceEnvironmental science & technology 39, pp. 5059–5065
Keywords4-Nitrophenol biodegradationSequencing batch reactorxenobiotic removalenvironmental technologies
JournalEnvironmental science & technology
EditorAmerican Chemical Society,, Easton, Pa., Stati Uniti d'America
Year2005
TypeArticolo in rivista
DOI10.1021/es0483140
AuthorsTOMEI M.C. (1); ANNESINI M.C. (2)
Text42191 2005 10.1021/es0483140 ISI Web of Science WOS 000230245500061 4 Nitrophenol biodegradation Sequencing batch reactor xenobiotic removal environmental technologies 4 NITROPHENOL BIODEGRADATION IN A SEQUENCING BATCH REACTOR OPERATING WITH AEROBIC ANOXIC CYCLES TOMEI M.C. 1 ; ANNESINI M.C. 2 1 Water Research Institute, C.N.R., Via Reno 1, 00198 Rome, Italy; 2 Chemical Engineering Department, La Sapienza University of Rome, Via Eudossiana 18, 00184 Rome, Italy The study regards 4 nitrophenol removal performed in a lab scale sequential batch reactor with an integrated aerobic anoxic cycle. The purpose of the study was to examine the kinetics of 4 nitrophenol biological oxidation and denitrification in order to test the feasibility of the proposed technological solution for xenobiotic removal. The results obtained show that high removal efficiency of 4 nitrophenol is easily achieved when the compound is fed into the reactor as the sole carbon source. Residual concentrations of 4 nitrophenol and nitrous/nitric nitrogen in the effluent lower than 1 mg L 1 were observed in the range of applied feed concentration 200 320 mg L 1 . Low concentrations of dissolved oxygen e2 mg L 1 in the feed and aerobic phases lead to appreciable simultaneous denitrification. As regards the denitrification process, while no carbonlimiting effects were observed at COD/N ratios g 3, a significant decrease in the rate of denitrification is detected for COD/N ratios e 2. The denitrification rate obtained in tests with no external carbon addition proved very low and unsuitable for practical application. A model of the denitrification process taking into account both the limiting effect of nitrogen and carbonaceous substrate has been proposed and applied for experimental data correlation. 39 http //pubs.acs.org/doi/abs/10.1021/es0483140 Articolo pubblicato su rivista ISI es0483140.pdf Articolo in rivista American Chemical Society, 0013 936X Environmental science technology Environmental science technology Environ. sci. technol. Environmental science technology. ES T Environmental science and technology mariaconcetta.tomei TOMEI MARIA CONCETTA