A NOVEL CONTROL STRATEGY FOR IMPROVED NITROGEN REMOVAL IN AN ALTERNATING ACTIVATED-SLUDGE PROCESS .2. CONTROL DEVELOPMENT

Citation
H. Zhao et al., A NOVEL CONTROL STRATEGY FOR IMPROVED NITROGEN REMOVAL IN AN ALTERNATING ACTIVATED-SLUDGE PROCESS .2. CONTROL DEVELOPMENT, Water research, 28(3), 1994, pp. 535-542
Citations number
7
Categorie Soggetti
Engineering, Civil","Environmental Sciences","Water Resources
Journal title
ISSN journal
00431354
Volume
28
Issue
3
Year of publication
1994
Pages
535 - 542
Database
ISI
SICI code
0043-1354(1994)28:3<535:ANCSFI>2.0.ZU;2-V
Abstract
The first part of this two part contribution dealt with an analysis of nitrification and denitrification in an alternating activated sludge nutrient removal process for the case of constant process conditions. The existence of an optimal cycle length, which is a function of the p rocess conditions, was demonstrated and discussed. Based on these find ings, this paper examines a control strategy by which the cycle length of an alternating activated sludge nutrient removal process is automa tically adjusted in order to compensate for changing process condition s. Two control algorithms are proposed. One involves proportional-inte gral-derivative (PID) control which requires minimal process informati on and computational effort. The second is a model based predictive co ntrol (MBPC) technique, which introduces a feedforward element into th e control strategy. The MBPC technique is examined using a relatively simple process model. The results of experimental demonstrations of th ese two algorithms in a pilot plant facility indicate their potential towards improving nitrogen removal in the alternating process.