The basics of 50% energy saving: PAPER & PRESENTATION
Newman, J., Kirkham, D., Puckering, O., Xylem Inc, UK
(free)
Abstract
In this paper, we describe how aeration performance and associated energy efficiency is due to the
design of the complete system, starting with aeration grid design and including blower type, system
pressure loss and dissolved oxygen control, as measured by kg O2/kWh used.
Efficient aeration design is not down to the type of diffusers used, but the air flow per diffuser area.
Lower flow enables longer the bubble retention time and so improves oxygen transfer. A system with
a larger diffuser area will have a greater oxygen transfer and so will require less air flow which may be
provided by a smaller blower.
The efficiency of the blower will have a dramatic effect on the kWh required to achieve the required
oxygen transfer. The pressure loss in the system and so the pressure at which the blower operates
has a significant effect upon the power used. Designing an efficient system can give short payback
periods for the additional capital costs.
Finally, the control of the system ensures its efficient operation. Following implementation of an
optimised aeration system, the next evolution involves the use of digital twin modelling in real time for
further process efficiencies, chemical and energy savings alongside greenhouse gas emission
reduction.
Keywords
Energy, aeration, control, diffuser density, optimisation, oxygen, efficiency, savings
