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Emerging Technologies Aeration prepared 2012 Integrated Air Flow Control Objective: Integrated Air Flow Control is a proprietary aeration control system which can result in better stability and simplified tuning of the aeration system process leading to more efficient blower operation and reduced energy consumption. Description: March 2013 Technology Summary State of Development: Innovative. This technology is being used in the US and is approaching an established process. This technology uses modern control capabilities to integrate basin and blower air control into a coherent strategy that eliminates the pressure control loop common in many automatic DO control systems. Traditional automatic dissolved oxygen (DO) control systems usually include four control loops: DO Control at the aeration basins, air flow control at the aeration basins, pressure control at the common air header, and air flow control at each blower. The discharge pressure control loop in traditional systems is used to stabilize air flow to individual aeration tanks and is often specified as part of the blower controls to adjust the air flow based on changes in DO. Since the relationship between actual oxygen transfer efficiency and air flow rate is non-linear and dependent on a number of changing factors, it is not possible to properly define a specific air rate that should be associated with a specific change in DO concentration. This coupled with the long process response time associated with DO control can cause instability in the operation of the blowers and control valves (cyclic oscillation, or hunting) as the control system attempts to adjust air flow and pressure in response to changes in the process and ambient air conditions The Integrated Air Flow Control System eliminates the pressure control loop. Air valves at individual tanks are used to distribute total air flow from the blowers proportionally to total demand. Blowers are controlled to provide the total system air flow required to meet total process demand. System pressure, which is the result of changing air flow and changing system restriction, is allowed to rise and fall as the friction losses change. The result is better stability, simplified tuning, and more efficient blower operation. In addition, a unique most open valve (MOV) logic is used to minimize system restriction and optimize header pressure by maintaining one valve — the MOV valve — at maximum position at all times. This further reduces the wasted energy resulting from constant pressure control. Comparison to Established Technologies: This technology represents an improvement to previous automated control systems that use cascaded control strategy that includes a pressure control loop’s output as a setpoint for blower air control. Energy savings on the order of 10% have been reported from implementing this technology. Available Cost Information: Project Cost of $200,000 (2007 Dollars) for a 23.7 MGD plant (average daily flow) with average energy savings of $135,786/yr and a simple payback period of 1.5 years. Vendor Name(s): Dresser Roots 2135 Hwy 6 South Houston, TX 77077 281-496-8100 www.rootsblowers.com Key Words for Internet Search: Installation(s): Bucklin Point WWTF/United Water 102 Campbell Avenue East Providence, RI 02916 Brent Herring, Superintendent 401-434-6350 X-182 Do control, blower control, wastewater treatment, Dresser 6-6 Wastewater Treatment and In-Plant Wet Weather ManagementPDF Image | Emerging Tech for Wastewater Treatment
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