title: Sliding mode control of dissolved oxygen in an integrated nitrogen removal process in a sequencing batch reactor (SBR).
abstract: This paper presents a sliding mode controller (SMC) for dissolved oxygen (DO) in an integrated nitrogen removal process carried out in a suspended biomass sequencing batch reactor (SBR). The SMC performance was compared against an auto-tuning PI controller with parameters adjusted at the beginning of the batch cycle. A method for cancelling the slow DO sensor dynamics was implemented by using a first order model of the sensor. Tests in a lab-scale reactor showed that the SMC offers a better disturbance rejection capability than the auto-tuning PI controller, furthermore providing reasonable performance in a wide range of operation. Thus, SMC becomes an effective robust nonlinear tool to the DO control in this process, being also simple from a computational point of view, allowing its implementation in devices such as industrial programmable logic controllers (PLCs).
authors.affiliation: Department of Electrical Engineering, Universidad de la Frontera, Casilla 54-D, Temuco, Chile. comunoz@ufro.cl
authors.forename: C
authors.initials: C
authors.lastname: Muñoz
authors.forename: H
authors.initials: H
authors.lastname: Young
authors.forename: C
authors.initials: C
authors.lastname: Antileo
authors.forename: C
authors.initials: C
authors.lastname: Bornhardt
mesh_terms: D019149:Bioreactors; D017022:Flow Injection Analysis; D009584:Nitrogen / Q000737:chemistry* / Q000378:metabolism*; D010100:Oxygen / Q000737:chemistry* / Q000378:metabolism*; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000378:metabolism; D018508:Water Purification / Q000379:methods
chemical_list: D014874:Water Pollutants, Chemical; D009584:Nitrogen; D010100:Oxygen