The ultra-modern EDAR Arroyo Quiñones sewage treatment facility, commissioned by Canal de Isabel II, a Spanish public water company, has a capacity of 45,705.60m3/day, and serves 172,500 inhabitants in San Sebastian de los Reyes, a municipality in the community of Madrid. The plant, which is nearing completion, is a new project designed and implemented by project engineers Grupo Sacyr y Vallehermoso, using motors supplied by WEG Spain.

With energy efficiency essential, WEG has supplied 100 W22 motors, among which are four 160kW machines for the blowers – supplied by Aerzen, these are used to add air to the biological and other processes. Also supplied were another three 15kW motors, also for blowers; four sludge recirculation pump motors of 15kW which were supplied by Sterling Fluid; and smaller denominations of motors for driving different processes right across the plant. The operation of these motors is mainly constant, but at different speeds, as determined by process requirements.

According to the company, the W22 motors deliver a highly efficient solution for addressing the 90% of total operational costs attributed to energy expenditure over the lifetime of typical motors used in pumping applications. They deliver efficiencies above the minimum values specified in IEC 60034-30, the new harmonised IE (International Efficiency) grading standard for three-phase cage induction motors. A key factor in this improvement in energy use is the W22’s new and aerodynamic frame, which increases airflow and reduces operational temperatures.

The robust motors are designed to suit demanding conditions, such as those faced at sewage treatment plants. The motor housings, endshields, terminal boxes and fan covers are produced in WEG’s own foundries using high quality cast iron. The fan cover is a new design that provides greater resistance against impacts, while the endshields have been designed to improve bearing heat dissipation.

“Today, electric motors account for as much as 65% of industry’s energy usage,” said de la Morena. “Yet, a huge amount of this energy is wasted as organisations use solutions that are poorly designed or inappropriate for their applications. By reducing this wastage with high efficiency motors such as the W22 line, companies not only meet their environment responsibilities, but also cut their costs and improve their profitability.”

WEG Electric Motors

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