Modelling headloss and two-step denitrification in a full-scale wastewater post-denitrifying biofiltration plant. Issue 3 (September 2014)

• Record Type: Journal Article
• Authors: Bernier, Jean; Rocher, Vincent; Lessard, Paul
• Is Part Of: Journal of environmental engineering and science. Volume 9:Issue 3(2014)
• Page Start: 171
• Page End: 180
• Publication Date: 2014-09
• Subjects: environment -- mathematical modelling -- sewage treatment & disposal; Environmental engineering -- Periodicals; Sanitary engineering -- Periodicals; Environmental engineering -- Canada -- Periodicals; Environnement, Technique de l' -- Périodiques; Technique sanitaire -- Périodiques; Environnement, Technique de l' -- Canada -- Périodiques; Environmental engineering; Sanitary engineering; Canada; Electronic journals; Computer network resources; Periodicals; 628.05
• DOI: 10.1680/jees.13.00012
• Languages: English
• ISSNs: 1496-2551

Abstract

Abstract : The NO3 − /NO2 − removal and headloss evolution behaviour of a post-denitrification wastewater biofiltration stage using methanol as an external carbon source was modelled. Three datasets collected on different time scales and at different locations on a full-size plant from the Paris conurbation (800 000 population equivalent) were used in this study. The model was first calibrated on a short-term experiment, during which a shift in the methanol to NOX ratio was imposed at the influent of a treatment lane. Measurements were taken at different frequencies at the effluent as well as at different heights inside the media bed. The model was then used on a 240-day period in 2008 to simulate the behaviour of the whole denitrification stage. Results were good overall for most simulated variables, although nitrite was overestimated for the long-term dataset. Results showed that the model is highly sensitive to variations on the amounts of methanol injected during treatment, especially regarding nitrite and headloss.