Centrifugal Pumps

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:

• Horizontal flow centrifugal pump, also known as non-clog pump
• Pump disintegration
• Volutetype
• Turbine type etc.

Advantages of Centrifugal pumps

These are the advantages of the centrifugal pumps:

• You will need to install it in a very small space
• You can easily install it.
• The pump transports suspended matter from sewage easily without becoming clogged.
• It is easy to do.
• It’s affordable in price
• High pressure can’t cause damage to the pump.

Disadvantages of Centrifugal Pumps

These are the disadvantages of the centrifugal pumps:

• It is impossible to regulate the flow rate.
• Without priming, this pump cannot be used.
• The suction of this pump is very limited.
• Pump efficiency will be affected by any air leakage from the suction side.

Reciprocating 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.

Ram Type

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.

Propeller Type

The propeller-type reciprocating pump has a propeller that moves vertically within a casing. This causes the sewage pump to rise.

Benefits of Reciprocating Pumps

These are the advantages of the reciprocating pump:

• The unit provides constant discharge at variable head.
• Flexible and durable
• This pump is ideal for large quantities of sewage and has a low head.

Disadvantages of Reciprocating Pumps

These are the disadvantages of centrifugal pumps:

• It is expensive to start.
• This requires additional space to install.
• It is not easy to maintain them.
• Valve wear is more.
• The pump cannot be used to pump sewage with large amounts of silt, sand, or other contaminants.

Pneumatic Ejectors and Air Pressure 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.

Benefits of Pneumatic Ejectors

These are the advantages of the Pneumatic Ejectors/Air Pressure Pump:

• You don’t need to supervise it.
• They are unlikely to get clogged.
• These are economical when smaller amounts of wastewaters need to be pumped.

Disadvantages of Pneumatic Ejectors

Pneumatic ejectors have a very limited efficiency of about 15%.