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Emerging Technologies March 2013 document referenced (in section 6.1 above) in this chapter which is available at http://water.epa.gov/scitech/wastetech/upload/Evaluation-of-Energy-Conservation-Measures- for-Wastewater-Treatment-Facilities.pdf.) Many energy conservation measures are established and essential measures relating to efficient pumping systems including pumps, drives and motors. In addition, established ECMs include fine bubble diffuser systems that increase the oxygen transfer efficiency, thereby decreasing energy demand. Established aeration equipment includes highly efficient turbo blowers which use friction-free bearing designs coupled with the use of high efficiency motors and integral speed control to achieve high energy efficiency. Established reactor mixing systems include hyperbolic mixers which use a stirrer located close to the bottom of a tank to promote complete mixing. Innovative development in energy conservation measures mainly focus on aeration system control or efficient equipment. Aeration control ECMs includes the Integrated Air Flow Control system which eliminates the pressure control loop common in many automatic DO control systems leading to more efficient blower operation and reduced energy consumption. Also included is the Automated SRT/DO Control ECM which uses algorithms to optimize DO and SRT set points and reduce energy consumption while maintaining process performance. A pulsed large bubble mixing system is included which achieves mixing requirements and reduced energy consumption by using short bursts of compressed air instead of mechanical mixers. Control of aeration for nitrification processes based on ammonia concentration is also being applied and will be included in a future version of this report. Knowledge about technologies tends to evolve. The information provides a snapshot at a point in time; what is understood at one point in time may change as more information develops. This includes knowledge about operating mechanisms as well as the relative and absolute costs and features of a particular technology. Inquiries into the current state of knowledge are an important step when considering implementation of any technology. 6-2 Wastewater Treatment and In-Plant Wet Weather ManagementPDF Image | Emerging Tech for Wastewater Treatment
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