Most commonly, centrifugal pumps can be used to lift sewage. This pump works on the principle centrifugal force. Pumps work by rotating sewage at high speeds through an impeller. Then, the centrifugal force throws the sewage to its periphery.
The velocity head becomes a pressure head. The head causes the sewage to flow through the Centrifugal pipe. These types of centrifugal pumps are available:
These are the advantages of the centrifugal pumps:
These are the disadvantages of the centrifugal pumps:
These days, reciprocating pumps are not often used. They can be useful for pumping large quantities of wastewater at low heads. There are two kinds of reciprocating pumps that can be used to pump sewage.
A ram-type reciprocating pumps consists of an enclosed cylinder where a piston, or plunger move to and from by a connecting rod. A motor rotates the connecting rod, which hinges on a wheel.
The suction stroke allows sewage to enter the cylinder. During delivery, the sewage will be forced through the pipe.
The propeller-type reciprocating pump has a propeller that moves vertically within a casing. This causes the sewage pump to rise.
These are the advantages of the reciprocating pump:
These are the disadvantages of centrifugal pumps:
This pump is used to move smaller quantities of wastewater. The pump consists of an enclosed tank in which wastewater is pumped by gravity. When enough wastewater accumulates to make a floating, the wastewater will be forced.
These are the advantages of the Pneumatic Ejectors/Air Pressure Pump:
Pneumatic ejectors have a very limited efficiency of about 15%.