The regional potential for energy efficiency improvements with
the presented compressor scenarios in urban waste water treatment
processes in the EU can be estimated roughly as follows.
First, the energy consumption of the aeration stage is estimated
to be 50–60% of the total WWTP energy consumption as discussed
by Hernández-Sancho et al. [20]. The average specific energy consumption
for treated waste water in this case is approximated to
be 0.45 kW h/m3