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- W2913409849 abstract "The operational conditions of petrochemical, aerobic activated sludge systems focused on organic matter removal often lead to the unintended proliferation of nitrifying bacteria. Consequently, undesired denitrification occurs in the clarifier, difficulting the accomplishment of each time more stringent emission levels. The addition of folic acid to limit nitrification is presented as an advantageous alternative, due to its low investment cost and easy implementation. To assess the effectiveness of folic acid for this purpose, cost-effective concentrations of 0.4 and 0.9 mg g−1 VSS day−1 have been supplemented to respective bench-scale, petrochemical bioreactors in comparison to a control. Eventually, the addition was interrupted to observe lasting effects. Based on Vibrio Fischeri assay, the folic acid concentrations tested did not add significant toxicity to the effluent. The supply of the lower vitamin concentration provided satisfactory results regarding to nitrification reduction (93.6%) and improvement of the sludge volumetric index compared to control (17.4 in front of 67.3 mL g−1). However, its feasibility is conditioned to the availability of spare aeration capacity, since oxygen demand increased in a 85.7%, probably due to an older sludge age (71.4% reduction in observed sludge yield). Reductions up to 97.1% in nitrification rates were obtained during and 60 days after the dosage of the higher vitamin concentration. Despite other advantages, such as increasing the organic matter removal efficiency (60.0%) and reducing oxygen demand (14.7%) relative to control, the high dosed reactor exhibited a worse sludge settling (93.1 mL g−1) and more sludge production (57.1% increase in observed sludge yield)." @default.
- W2913409849 created "2019-02-21" @default.
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- W2913409849 date "2019-04-01" @default.
- W2913409849 modified "2023-10-16" @default.
- W2913409849 title "Biological nitrification control by addition of folic acid in a petrochemical wastewater treatment focused on organic matter removal" @default.
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- W2913409849 doi "https://doi.org/10.1016/j.jece.2019.102935" @default.
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