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Bioprocess Aeration Control System PDF

28 Pages·2015·1.73 MB·English
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Bioprocess Aeration Control System BioChem Technology, Inc. King of Prussia, PA March 18, 2015 BioChem Technology Milestones 1978 Incorporation of BioChem Technology, Inc. as a pharmaceutical process consulting firm 1990 Transition to consulting for wastewater treatment processes 1990 - Focus on R&D and municipal WW process consulting 2000 1997 Begin development of current product line 2000 Installation of first self-calibrating ammonium ISE analyzer 2004 First installation of BIOS process controller 2008 First installation of BACS in US 2011 ISO 9001:2008 and 14001:2004 Certification Process Control Objectives in BNR Plants • Stabilize the biology • Improve effluent quality • Improve energy efficiency • Maximize nitrogen removal. BioChem Products • BIOS - Optimal Process Control (Ammonia Control) • BACS - Integrated Aeration Control System • Engineering Services – Process Simulation & Optimization Control Problem: Diurnal Plant Loading Influent ammonia concentration as a measure of loading Aeration Control Current technology o Constant pressure blower control o Feedback PI control of individual aeration zones o No communication between control loops BioChem Solution (BACS) o Flow based blower control o Process-based control of aeration zones o Integration of control systems Conventional DO Control Systems • typically independent cascaded PI loops for each zone SP DO PI SP Airflow PI Controller PV PV Controller SP DO FIT M Aeration FE Air Zone Header Flow Control Valve Conventional DO Control Systems multiple tuning loops and all sorts of interactions SP SP SP DO PI SP DO PI SP Airflow PI ContrDolOle rP I PV Airflow PI SP Controller PV ConAtrirofllloewr PI Controller PV PV Controller SP Controller SP SP DO FIT M FIT M Aeration FIT M FE Zones Air FE Header FE p=const PIT Flow Control Pressure PI Valve Controller Blowers Blower MCP PI Pressure Control - Out of Tune 4 3.5 ) L 3 / g m ( 2.5 n o i DO Set-point 2.5 mg/l (constant) t a 2 r t n e c n 1.5 o C Controller out of tune O 1 D 0.5 0 0:00 6:00 12:00 18:00 0:00 Time PI Pressure Control Valve hunting between zones 3.0 2.5 2.0 4.0 hours Instability o Two aeration zones on constant pressure header o Valve action is a response to changes in the opposing zone, not changes in the process o Basin and blower control loops “fight” each other o Difficulties operating at extremes of blower capacity o Interactions with multiple basins or control zones

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Instability o Two aeration zones on constant pressure header o Valve action is a response to changes in the opposing zone, not changes in the process o Basin and blower control loops “fight” each other o Difficulties operating at extremes of blower capacity o Interactions with multiple basins o
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