The illustration below shows the complete sewage treatment process. Bedford Pumps manufacture a range of submersible and conventional pumps which are suitable for each stage of this process.
Sewage pumping stations or “lift stations” handle the raw sewage that is fed from underground gravity pipelines. Sewage is fed into and stored in an underground pit, commonly known as a wet well. When the sewage level rises to a predetermined point a pump will be started to lift the sewage upward. Bedford Pumps volute range of pumps (SV/DV) would be the ideal choice in this stage of the sewage treatment process.
The primary treatment stage moves the sewage slowly through tanks to remove the grit then passes it to large sedimentation tanks where the remaining particles will form a sludge. Bedford Pumps would recommend Return Activated Sludge Pumps from their SA/SB Range to assist with this process. Fine particles and matter remain, so secondary treatment will be required.
The secondary treatment stage is a biological process to remove bacteria from the remaining sewage prior to discharge or tertiary treatment. Bedford Pump’s Effluent & Final Effluent pumps (SB Range) would be the ideal solution to process this type of application.
Final discharge occurs when treated water is released into streams, rivers, bays, lagoons or wetland. It can also be used for irrigation purposes, or if sufficiently clean, for groundwater recharge or agriculture.