Positive Energy Balance in the Water Cycle: Transforming WWTPs into Net Energy Generators

The water sector is responsible for 2-3% of global energy consumption, with WWTPs being highly energy-intensive facilities. Wastewater treatment consumes between 0.3-0.6 kWh/m³, with aeration accounting for 50-60% of total consumption.

How could we

• Energy dependence: WWTPs are net consumers of energy from the electricity grid.
• High carbon footprint: Direct emissions (N2O, CH4) and indirect emissions (electricity consumption).
• Underutilized resources: The energy potential of wastewater (organic, thermal, hydraulic content) is not fully exploited.
• Rising operating costs: Energy accounts for 30-40% of operating costs.