Improvement of ammonia removal in activated sludge process with feedforward-feedback aeration controllers.
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.
Vrecko
Darko
D
Jozef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia. darko.vrecko@ijs.si
Hvala
Nadja
N
Stare
Aljaz
A
Burica
Olga
O
Strazar
Marjeta
M
Levstek
Meta
M
Cerar
Peter
P
Podbevsek
Sebastjan
S
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
D012722:Sewage; D000641:Ammonia; D010100:Oxygen