Lift stations are generally used to move wastewater or sewage from lower to higher elevation areas. They are different from pump stations that work with pure liquid only. Lift stations consist of a wet well, a pump, pipes, control system, alarm system, odour and ventilation system. They can be either privately owned or a municipal lift station.
Basically, there are 2 types of lift stations – the dry pit and submersible lift stations. These two differ a lot in structure but has the same function; to move sewage waste through pipes into a main sewer. Lift stations can be constructed on-site or pre-made like a precast sewer pump station. Read along to learn more about these two types.
Dry Pit Lift Station
In the dry pit or dry well lift station, the pump and valves are located in a room separate from the wet well. It is a dry area which is easily accessible, making it more convenient during routine maintenance and repairs. The pump room is located adjacent to the wet well and is connected to each other by an inlet pipe that moves the waste from the wet well through the dry well and up to the discharge point.
One of the best features of dry pit lift station is that the pump and valves can be easily checked because they are located in a different chamber, thus making them easier to maintain and repair. However, this type of system requires more space because of the separate wet well and dry well areas.
Submersible Lift Station
On the other hand, submersible lift station got its name from the location of its pump. This type of lift station doesn’t have a separate room for its pump and valves, rather these parts are submerged in the wet well itself. The pumps are sealed since they will be submerged under wastewater but are regularly removed and checked for maintenance purposes.
One great advantage of submersible lift stations is their cost. They are generally cheaper to install than dry pit lift systems because they require lesser space. Submersible lift stations are also designed to operate with lesser maintenance because of its structure.
Advantages of Lift Stations
Generally, lift stations cost lesser than traditional gravity flow sewer system. In a gravity sewer, the excavation and line installation costs become more expensive especially on low-lying areas because the slope should be enough to allow proper flow of the sewage waste. In lift stations, there’s no need to consider the slope since the pump will pressurize the sewage, making it pass through pipes regardless of elevation. Lift stations also require lesser space to be installed which is a perfect choice for crowded areas. They are also more efficient in maintaining wastewater flow since they utilize sensors that kick the pump on when a certain level of sewage is reached.
In general, lift stations are a great innovation when it comes to proper waste management. Each type has its own share of pros and cons but both function for the same purpose.