title: Improvement of ammonia removal in activated sludge process with feedforward-feedback aeration controllers.
abstract: In the paper three linear aeration controllers that can be easily implemented are presented and evaluated on the activated sludge process pilot plant. Controllers differ according to the information that is used about the process, which can be oxygen in the last aerobic reactor, ammonia in the last aerobic reactor and ammonia in the influent. The aeration controllers that are addressed are: oxygen cascade PI controller, ammonia cascade PI controller and ammonia feedforward-cascade PI controller. Experiments show that, in comparison with the oxygen cascade PI controller, the ammonia cascade PI controller allows better control of effluent ammonia and airflow savings of around 23%, while the ammonia feedforward-cascade PI controller gives the best reduction of ammonia peaks and can save up to 45% of the airflow.
authors.affiliation: Jozef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia. darko.vrecko@ijs.si
authors.forename: Darko
authors.initials: D
authors.lastname: Vrecko
authors.forename: Nadja
authors.initials: N
authors.lastname: Hvala
authors.forename: Aljaz
authors.initials: A
authors.lastname: Stare
authors.forename: Olga
authors.initials: O
authors.lastname: Burica
authors.forename: Marjeta
authors.initials: M
authors.lastname: Strazar
authors.forename: Meta
authors.initials: M
authors.lastname: Levstek
authors.forename: Peter
authors.initials: P
authors.lastname: Cerar
authors.forename: Sebastjan
authors.initials: S
authors.lastname: Podbevsek
mesh_terms: D000332:Aerobiosis; D000392:Air Movements; D000641:Ammonia / Q000302:isolation & purification*; D019149:Bioreactors; D005246:Feedback; D009862:Online Systems; D010100:Oxygen / Q000032:analysis; D012722:Sewage; D012984:Software; D014865:Waste Disposal, Fluid / Q000295:instrumentation* / Q000379:methods
chemical_list: D012722:Sewage; D000641:Ammonia; D010100:Oxygen