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Lift Stations and Grinder Pumps
Lift stations are an essential feature of waste water treatment systems, since they move wastewater and sewage from low to high elevations, particularly where the circumstances make it difficult or expensive to use gravity flow design. Lift stations can be more economical as a solution to moving sewage, or it may be necessary to overcome insufficient hydraulic head.
Lift stations are typically factory assembled systems which contain the key elements. A lift station needs to have a wastewater treatment receiving well, or wet well, with the appropriate lift pumps, piping and valves. A junction box, and an equipment control panel, complete with an alarm system would also be needed for a properly designed lift station.
Lift stations also need to include appropriate solids handling pumps, such as grinder pumps. The design of the lift station needs to take into account the ability of the grinder pumps systems to move the sewage at an adequate pace, without staying overly long in the wet well. The wet well is only to hold the effluent while the pumps in the system accomplish the job of moving the liquid along to the treatment facility.
Submersible lift stations offer a significant cost advantage in that they require less maintenance than dry-well stations, and typically do not require large structures to be built above the ground. It is reasonable to expect that a steel lift station will last for 15 to 20 years. Lift stations constructed of steel are generally coated with a high solids expoxy paint which protects from cathodic action. Submersible pumps, like the lift station, will have extended life and lower costs, since maintenance needs for the submersible pumps is much less than for the dry pumps.
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