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Abstract
This paper introduces the application of a fully dynamic air distribution model integrated with a biokinetic process model and a detailed process control model. By using a fully dynamic air distribution model, it is possible to understand the relationships between aeration equipment, control algorithms, process performance, and energy consumption, thus leading to a significantly more realistic prediction of water resource recovery facility (WRRF) performance. Consequently, this leads to an improved design of aeration control strategies and equipment. A model-based audit has been performed for the Girona WRRF with the goal of providing a more objective evaluation of energy reduction strategies. Currently, the Girona plant uses dissolved oxygen control and has been manually optimised for energy consumption. Results from a detailed integrated model show that the implementation of an ammonia-based aeration controller, a redistribution of the diffusers, and the installation of a smaller blower lead to energy savings between 12 and 21%, depending on wastewater temperature. The model supported the development of control strategies that counter the effects of current equipment limitations, such as tapered diffuser distribution, or over-sized blowers. The latter causes an intermittent aeration pattern with blowers switching on and off, increasing wear of the equipment.
Highlights
Water resource recovery facilities (WRRFs, formerly wastewater treatment plants) are among the main consumers of energy in a municipality
Classic energy audits identify opportunities to reduce energy use, typically based on the average energy consumption of unit processes, which may include benchmarking with similar plants or comparison against key performance indicators
The objective of this study was to model the dynamic interactions between process performance, aeration system equipment, controller settings, and energy consumption, to gain understanding of the limitations of the current operating approach
Summary
Water resource recovery facilities (WRRFs, formerly wastewater treatment plants) are among the main consumers of energy in a municipality. The WRRF aeration system is an important target for reducing municipal energy demands. Classic energy audits identify opportunities to reduce energy use, typically based on the average energy consumption of unit processes, which may include benchmarking with similar plants or comparison against key performance indicators. Significant saving potential lies in the adaptation of operational parameters to the variability of. More meaningful energy audits should use dynamic models that integrate the treatment process, mechanical equipment, and a detailed description of the applied control strategies
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Schedule a callMore From: Water science and technology : a journal of the International Association on Water Pollution Research
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