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Table 4

Energy saving potential by reducing power density to tolerance value or target value – data basis: 220 WWTPs corresponding to 286 tanks with an overall design capacity of ∼6 million PE120 and an overall volume of ∼830,000 m³

Tank volumeNumber of tanksEnergy consumptionEnergy saving potential by reduction to tolerance value
Energy saving potential by reduction to target value
(m³)(n)(kWh a−1)(kWh a−1)(%)(kWh a−1)(%)
≤200 20 302,433 104,892 35 147,354 49 
200–500 54 902,823 243,509 27 385,893 43 
500–1,000 88 3,205,669 895,217 28 1,405,026 44 
1,000–2,000 69 3,415,906 739,676 22 1,193,757 35 
>2,000 55 5,328,494 1,117,941 21 2,110,003 40 
TOTAL 286 13,155,325 3,101,234 24 5,242,033 40 
Tank volumeNumber of tanksEnergy consumptionEnergy saving potential by reduction to tolerance value
Energy saving potential by reduction to target value
(m³)(n)(kWh a−1)(kWh a−1)(%)(kWh a−1)(%)
≤200 20 302,433 104,892 35 147,354 49 
200–500 54 902,823 243,509 27 385,893 43 
500–1,000 88 3,205,669 895,217 28 1,405,026 44 
1,000–2,000 69 3,415,906 739,676 22 1,193,757 35 
>2,000 55 5,328,494 1,117,941 21 2,110,003 40 
TOTAL 286 13,155,325 3,101,234 24 5,242,033 40 
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