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Nitrous oxide monitoring for nitrifying activated sludge aeration control: a simulation study
journal contribution
posted on 2023-05-20, 17:45 authored by Eric SivretEric Sivret, Peirson, WL, Stuetz, RMAn activated sludge aeration control concept was developed utilizing off‐gas nitrous oxide concentrations as a surrogate for autotrophic nitrifying bacterial inhibition and aeration air as a master control variable. The control concept was evaluated using a simulated pilot scale bioreactor (mathematically calibrated liquid phase process model and a model to link off‐gas nitrous oxide generation to liquid phase conditions) as a data generator. When applied to the simulated system, the process controller was successful at maintaining the process at the desired operating setpoint and promoting stable operation by minimizing periods of significant inhibition. Furthermore, it provided a more efficient use of the air supplied to the bioreactor during periods of varying feed loading by matching the air supply to the metabolic demands, substantially reducing periods of over and under‐aeration. The findings of this research demonstrate the potential for off‐gas nitrous oxide monitoring as a completely non‐invasive alternative to liquid phase monitoring used in conventional dissolved oxygen control. Investigations are currently underway at the laboratory scale to evaluate the benefits and limitations associated with this control concept, with particular emphasis on implementation issues and the quantification of potential aeration and cost savings.
History
Publication title
Biotechnology and BioengineeringVolume
101Pagination
109-118ISSN
0006-3592Department/School
School of EngineeringPublisher
John Wiley & Sons IncPlace of publication
111 River St, Hoboken, USA, Nj, 07030Rights statement
Copyright 2008 Wiley Periodicals, IncRepository Status
- Restricted