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Wastewater inlet station energy cost reduced by €42k per year

Two screw pumps operated at less than a third of their nominal power. SAM4 Energy determined that a single screw pump could easily handle all the flow during dry weather, saving €42k/year and reducing carbon footprint by 75 tons/year.

Problem

Two Archimedes screw pumps operated in parallel at the inlet station to a wastewater treatment plant. Both pumps were rated to operate at a nominal power of 185 kW. Based on operational data, SAM4 Energy determined that the pumps spent almost half of their time running at less than a third of nominal power, reducing the station’s energy efficiency by 25%.

Problem histogram

Solution

Because the region served by the treatment plant uses combined sewers, where rainfall flows through the same piping as domestic waste, the inlet station was designed to handle weather-related surges in flow. Our Energy team used historical data to determine that a single screw pump could easily handle all the flow during dry weather — which is nine months of the year in this region. This single pump would then operate at a higher load, improving its efficiency.

Solution graph

Savings

This simple operational change would save the pump owner €42,000 per year in energy costs and reduce the station’s carbon footprint by 75 metric tons per year.

energy optimization case inlet station table

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