Landia bring big energy savings to Holstebro Sewage Treatment Plant

At the two-stage STP, which has primary precipitation and extraction of organic matter for biogasification, frequency- controlled Landia 4.0 kW axial flow propeller pumps (with a 1500 m³ output) have been installed in the aeration tanks at Holstebro, where energy-saving, sludge minimization and reduced CO2 emissions have been key initiatives. A flow measurer was also mounted on the pipe to control the recirculation level.

Calculating the energy savings was based on a new propeller pump using 2 kW at a 700 m³ flow corresponding to one old pump at 500 m³ / 8.5 kW and one old pump at 270 m³ / 3.0 kW – to give a saving of 9.5 kWh/working hour.

Multiplying working hours by kW for both the old and the new pumps, it was calculated that that there would be annual saving of approximately 48,000 kWh per tank (4 x 48,000 kWh) = 192,000 kWh per year.