Table 4. Variation in unit electricity consumption for different sizes of wastewater treatment plants (Goldstein and Smith 2002b). Larger wastewater treatment plants exhibit economies of scale with lower energy requirements per volume of wastewater treated.
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|
Electricity Consumption (kWh/ML)† |
|
|
Wastewater Treatment Plant
Size
(ML/d)‡ |
Trickling Filter |
Activated Sludge |
Advanced Wastewater Treatment |
Advanced Wastewater Treatment with
Nitrification |
| |
|
3.8 |
480 |
590 |
690 |
780 |
|
19 |
260 |
360 |
420 |
510 |
|
38 |
230 |
320 |
370 |
470 |
|
76 |
200 |
290 |
340 |
440 |
|
190 |
180 |
280 |
320 |
420 |
|
380 |
180 |
270 |
310 |
410 |
|
| |
‡ML/d: megalitres per day
|