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During the concept stage for the optimization of the biological treatment, the projected energy savings were approx. 72,000 €/year. Considering a capital investment of 420,000 €, the amortization time would have been approx. 6 years.
A recent analysis revealed an actual energy conservation of 30% (see diagram), which exceeded the expectations. Based on the actual energy costs of 19.8 ct/kWh and a monthly energy conservation of average 53,500 kWh, the actual savings amount to 127,300 € per year, reducing the amortization time to approx. 3.3 years. The total energy consumption of the biological stage in relation to the load has improved from 26.2 to 20.6 kWh/(PECOD*year). The following diagram demonstrates the savings during the individual optimization stages. The average outlet parameters in terms of overall nitrogen concentration are far below 5 mg/l.
Energy savings with efficiency improvements on the biological treatment
Wasser- und Abwasserzweckverband Gotha und Landkreisgemeinden
150,000 / 82,000 PE
2013 / 2014
Installation of 8 submerged stirrers and 8 guide baffles for the surface aerators, installation of an Aqualogic®-control system and according sensors