Validation of a new model for the sizing of denitrification reactors, by testing full-scale plants
A new deterministic model for the calculation of the specific denitrification rate (SDNR), useful for the design of pre-denitrification reactors, was tested on eight full-scale activated sludge plants. The model represents the SDNR at 20°C (SDNR20°C) as a function of the sludge loading in the denitr...
| Veröffentlicht in: | Environmental technology. - 1993. - 38(2017), 11 vom: 04. Juni, Seite 1376-1382 |
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| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2017
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| Zugriff auf das übergeordnete Werk: | Environmental technology |
| Schlagworte: | Journal Article Activated sludge biological processes denitrification modelling nitrogen removal |
| Zusammenfassung: | A new deterministic model for the calculation of the specific denitrification rate (SDNR), useful for the design of pre-denitrification reactors, was tested on eight full-scale activated sludge plants. The model represents the SDNR at 20°C (SDNR20°C) as a function of the sludge loading in the denitrification reactor (F:MDEN) and the residual dissolved oxygen in the denitrification reactor (DODEN). The results proved the ability of the model in calculating the SDNR20°C. The model shows a lower degree of adaptability for small-sized plants. SDNR20°C proved to have a strong sensitivity to DODEN, mainly in correspondence with low DO concentrations (less than 2 mg L-1). The sensitivity decreases at greater DO values, but with a progressively less marked gradient, up to becoming weak only at DO concentrations greater than 0.4-0.5 mg L-1, which are rarely found in full-scale plants. DO concentrations measured in real-scale facilities are mostly in the range 0.2-0.4 mg L-1. These concentrations cause adverse effects on the kinetics of nitrogen removal, and consequently on the denitrification performance. Thus, minimizing DO in the pre-denitrification reactor is relevant. The sensitivity of SDNR20°C to F:MDEN was less important, as it is characterized by a growing linear behaviour with a low slope |
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| Beschreibung: | Date Completed 03.10.2017 Date Revised 03.10.2017 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1479-487X |
| DOI: | 10.1080/09593330.2016.1228700 |