Affiliations: Key Laboratory of Beijing for Water Quality Science
and Water Environment Recovery Engineering, Beijing University of Technology,
Beijing 100022, China | College of Municipal and Envionmental Engineering,
Harbin Institute of Technology, Harbin 150008, China
Abstract: A bench-scale reactor (72 L) red with domestic sewage, was operated
more than 3 months with three operation modes: traditional mode, modified mode
and real-time control mode, so as to evaluate effects of the operation mode on
the system performance and to develop a feasible control strategy. Results
obtained from fixed-time control study indicate that the variations of the pH
and oxidation-reduction potential (ORP) profiles can represent dynamic
characteristics of system and the cycle sequences can be controlled and
optimized by the control points on the pH and ORP profiles. A control strategy
was, therefore, developed and applied to real-time control mode. Compared with
traditional mode, the total nitrogen (TN) removal can be increased by
approximately 16% in modified mode and a mean TN removal of 92% was achieved in
real-time control mode. Moreover, approximately 12.5% aeration energy was saved
in realtime control mode. The result of this study shows that the performance
of nitrogen removal was enhanced in modified operation mode. Moreover, the
real-time control made it possible to optimize process operation and save
aeration energy.
