Energy Savings at Phoenix 23rd Avenue Wastewater Treatment Plant Using Feed-Forward Process Control
23rd Avenue Wastewater Treatment PlantPhoenix, Arizona
Monitoring of influent loading and plant operating conditions, together with a real-time feedforward control model, allows dissolved oxygen (DO) set-points to be matched in real time to the influent loading. Adjusting DO set-points based on load results in a significant reduction in aeration energy. This paper discusses the monitoring technology, and optimization and control techniques used in an energy savings project at the 23rd Avenue Wastewater Treatment Plant (23rd Avenue WWTP) in Phoenix, Arizona. The plant treats an average of 48 MGD using an MLE process, with a goal of complete nitrification. Load-based feed-forward control of dissolved oxygen in an activated sludge wastewater treatment plant can provide measurable and consistent energy savings through reduced aeration requirements without jeopardizing effluent quality. In the case presented here, aeration energy savings were in the range of 11% to 18%, despite constraints on the controller that prevented it from lowering the DO set-point below an operator defined limit. At Phoenix 23rd Avenue WWTP this represents a savings of 2000 MWh per annum and a carbon footprint reduction of 1,400 metric tons. The results are consistent with savings achieved using the same control methods at plants in different climate zones (Liu, 2003). Source: WEFTEC 2009 Proceedings
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Posted: August 27th, 2010 | Filed under: 100K-500K, Waste Water Treatment | Tags: Cost Savings, Energy Savings, Environmental Impact, Plant Optimization, Reduced Carbon Footprint | 2 Comments »
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