Rf. Yu et al., APPLYING REAL-TIME CONTROL TO ENHANCE THE PERFORMANCE OF NITROGEN REMOVAL IN THE CONTINUOUS-FLOW SBR SYSTEM, Water science and technology, 38(3), 1998, pp. 271-280
Citations number
19
Categorie Soggetti
Water Resources","Environmental Sciences","Engineering, Civil
Conventional operations of wastewater treatment systems use the concep
ts of steady-state control, and often lead to unnecessary resource con
sumption for maintaining system functions. Real-time control was exami
ned as a useful approach for improving the operation of wastewater tre
atment systems. This paper presents the application of real-time contr
ol to enhance the performance of nitrogen removal in a continuous-flow
SBR system. A real-time control system combining on-line measurement
of ORP and pH with Artificial Neural Network (ANN) model was proposed
to carry out unsteady-state regulation of the hydraulic retention time
of different operation phases. The result of this study shows that th
e performance of nitrogen removal was enhanced under real-time operati
on. Compared with fixed-time operation, the retention time of aerobic
and anoxic phases can be reduced by approximately 45% and 15.5% in rea
l-time operation respectively, also meaning that 45% aeration energy c
an be saved. The real-time operation also reveals a higher total nitro
gen removal in a relative short retention time. Moreover, some dynamic
s and kinetics of nitrogen were investigated. These indicate the occur
rence of nitrite-type nitrification under real-time operation. This ni
trite-type nitrification results in the enhancement of denitrification
performance with less carbon resource requirement and higher denitrif
ication efficiency. (C) 1998 Published by Elsevier Science Ltd. All ri
ghts reserved.