Sewage works saves energy on filter bed application

ABB variable speed drives improve energy efficiency with payback of less than three years at a Severn Trent Water sewage treatment works. Severn Trent Water is saving 15,000 kWh per year after installing two ABB variable speed drives at its Edwinstowe filter bed sewage treatment works in Nottinghamshire. The sewage treatment works includes a stone filter bed that requires a minimum circulation flow. If the inflow to the stone filter bed drops below its 75…