Sewage ejector

A sewage ejector is a sealed pressurised vessel that uses compressed air to push sewage upwards from a low-level collection chamber into a higher gravity sewer. They are used where mechanical submersible pumps are unsuitable, for example in critical commercial installations or where fibrous waste would damage impellers. UK installations follow Building Regulations Part H1 and BS EN 752, with redundancy provided by twin compressors or backup pumps. Ejectors are often found in older Victorian and Edwardian London buildings that were retrofitted with basement sanitary facilities. Modern alternatives such as packaged submersible pumping stations are increasingly preferred for new installations because of lower power consumption and simpler maintenance. Ejector systems require periodic inspection of seals, valves and compressors by a qualified engineer.