TY - JOUR
T1 - Actuators monitoring system for real-time control of nitrification-denitrification via nitrite on long term operation
AU - Antileo, Christian
AU - Medina, Hardy
AU - Bornhardt, Cristian
AU - Muñoz, Carlos
AU - Jaramillo, Francisco
AU - Proal, Jose
N1 - Funding Information:
The financial support by research grant FONDECYT Nr. 1070574 , DI12-0088 ( Universidad de La Frontera ) is gratefully acknowledged.
PY - 2013/5/1
Y1 - 2013/5/1
N2 - A real-time control strategy for SBR was designed in order to control the length of the reaction phases for an integrated nitrification-denitrification process via nitrite, by using an actuators monitoring system instead of monitoring pH or oxygen signals. The real-time control strategy was validated during 220. days at a low dissolved oxygen concentration (1-2.0. mg/L), C/N ratio of 1-2. g COD/g. N, and at initial ammonia nitrogen concentrations in a range of 50-600. mg. N/L. The aerobic reaction was conducted under control of pH and dissolved oxygen concentration and their manipulated variables: air valve opening and inorganic carbon consumption were used to detect bending points and the end of nitrification, whereas ORP and pH curves were used to detect the end of denitrification. This strategy led to a removal of total nitrogen over 94%, with a nitrite accumulation of 80% and a simultaneous nitrification denitrification of up to 60%. Additionally, a dosage strategy of adding external carbon during denitrification was developed by evaluating the pH derivative, and it was found that the anoxic time was able to reach values as low as 8% of the total reaction time.
AB - A real-time control strategy for SBR was designed in order to control the length of the reaction phases for an integrated nitrification-denitrification process via nitrite, by using an actuators monitoring system instead of monitoring pH or oxygen signals. The real-time control strategy was validated during 220. days at a low dissolved oxygen concentration (1-2.0. mg/L), C/N ratio of 1-2. g COD/g. N, and at initial ammonia nitrogen concentrations in a range of 50-600. mg. N/L. The aerobic reaction was conducted under control of pH and dissolved oxygen concentration and their manipulated variables: air valve opening and inorganic carbon consumption were used to detect bending points and the end of nitrification, whereas ORP and pH curves were used to detect the end of denitrification. This strategy led to a removal of total nitrogen over 94%, with a nitrite accumulation of 80% and a simultaneous nitrification denitrification of up to 60%. Additionally, a dosage strategy of adding external carbon during denitrification was developed by evaluating the pH derivative, and it was found that the anoxic time was able to reach values as low as 8% of the total reaction time.
KW - Actuators
KW - Bending points
KW - Nitrification-denitrification
KW - Oxygen control
KW - Real-time control
KW - SBR
UR - http://www.scopus.com/inward/record.url?scp=84876337681&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2013.02.079
DO - 10.1016/j.cej.2013.02.079
M3 - Artículo
SN - 1385-8947
VL - 223
SP - 467
EP - 478
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -