SUPPLEMENTAL ENERGY SAVINGS TO AUTOMATIC DISSOLVED OXYGEN CONTROL USING OUR PROCESS

Author： DiMassimo Rich W. Broughton Caroline C. Hong Sun-Nan Mah Terry J.

ISSN： 1938-6478

Source： Proceedings of the Water Environment Federation, Vol.2000, Iss.10, 2000-01, pp. : 847-856

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Abstract

An innovative enhancement to automatic dissolved oxygen control, incorporating analyses of oxygen utilization rate (OUR), resulted in a significant reduction in energy consumption and expense when tested at a 10 MGD biological wastewater treatment facility located in North Carolina. Energy consumption for aeration at the facility, designed for full biological nutrient removal, decreased between 40 to 50% from the use of an automatic dissolved oxygen control system to control aeration equipment. The OUR enhancement increased these savings an additional 10 to 15% during the evaluation period.The plant has operated with automatic DO control since start up in 1997. The automatic DO control system ensures that the aeration equipment runs only when it is needed by monitoring the residual DO concentration. Equipment run times were initially monitored to observe the effects of DO control and the results demonstrated a 40 to 50% energy savings in rotor operation.Power monitors were installed in 1998 to observe the actual power consumption of the process. The estimated energy consumption for the PID process without DO control is 8,187 kW-hr/day. The average energy consumption from the power monitors for the PID process with DO control but prior to implementing the OUR process was 5,110 kW-hr/day. In July 1998, the supplemental OUR control process was introduced to the system while continuing to monitor the power consumption in order to observe its effects. The average energy consumption for the PID system after the implementation of OUR was 4,373 kW-hr/day.