Select The Best Suitable Pump For Waste Water Treatment Plant

Waste water treatment plants are very important at the places where large volume of waste water is generated and discharged every day. Especially some industries like food industries, chemical industries, pharmaceutical industries and manufacturing units where installation of waste water treatment plants is obligatory as per government rules. In fact, it is the best way to conserve the precious natural resource, water. The waste water treatment plant incorporates different treatment processes known as primary, secondary and tertiary treatment processes through which one can avail desired level of purity of water for reuse or to discharge it in the environment. The waste water discharged at different industries comprises of different types of contamination and accordingly, waste water plant is designed with different treatment technologies. Whatever may be the technologies or processes used in the treatment plant, pumps are the essential components of all waste water treatment plants. If you are seeking for the efficient pumps for the waste water treatment plant, explore all information about the pumps used in the plant at one place.

Pumps Used In Waste Water Treatment Plants

Pumps are used to push the contaminated water or sewage in the plant to pass through different treatment processes. Here you will know about the most commonly used pumps in various waste water treatment plants – 

• Sewage pumps – The pumps used to drain the waste water, sewage/ slurry are known as sewage pumps. The widely used sewage pumps include –

· Centrifugal pumps – These pumps show different configurations. It is the widely used pump because of its design simplicity, smooth flow rate, wide range of capacity and ease of operation and maintenance. It works by directing the liquid using suction technique through its impellers. These pumps usually work best for low viscosity liquids with high flow rates.

Horizontal Multistage Centrifugal Electric Pumps

· Submersible water pumps – These pumps are commonly used to drain slurry or sewage. The pump unit is placed below the water/ sewage and the pump operation is controlled by level sensors. You will find different types of submersible pumps in the market such as sump pumps designed to drain water from sumps, trash pumps. Some submersible pumps handle solid sewage while grinder pumps are used for pressure sewer.  

Submersible Pump

• High Pressure Pumps - These pumps work on the axial piston principle which facilitates very light and compact design. These pumps show fix displacement type of pumps or variable delivery pumps.

High Pressure Seawater Pump

• Water pressure booster pumps – These pumps are used in different applications to control water pressure to maintain its flow. Booster pumps are usually used in residential, commercial, industrial or horticulture applications. 

  

  BoostStar - Hydroneumatic Systems

These different types of pumps can be installed in the waste water treatment plant according to the sewage to be moved across the plant, its volume and the type of pump that can suit the most. Installation of efficient and low maintenance pumps in waste water treatment plant helps achieve efficient system to get quality water.

What is Centrifugal Pump?

A pump is a hydraulic machine which converts mechanical energy into hydraulic energy or pressure energy. A centrifugal pump is also known as Roto dynamic pump or dynamic pressure pump. It works on the principal of centrifugal force.

Centrifugal Pumps are the most commonly used pump type in the world. They are utilized to raise the pressure or include flow in a control volume. The centrifugal pump creates an increase in pressure by transferring mechanical energy from the motor to the liquid through the rotating impeller. The fluid flows from the inlet to the impeller centre and along its blades. The centrifugal force here by increase the liquid velocity and consequently also the kinetic energy is transformed to the pressure. There are various kinds of Centrifugal pump are available in the market with different construction details. But the working principle behind all of them remains same.

 

Classification of Centrifugal Pumps:

1. According to the Casting design
   a) Volume Pump
   b) Diffuser or turbine pump
2. According to the number of impellers
   a) Single stage pump
   b) Multistage or multi impeller pump
3. According to the number of entrances to the impeller
   a) Single suction pump
   b) Double suction pump
4. According to disposition of shaft
   a) Vertical shaft pump
   b) Horizontal shaft pump
5. According to liquid handled
   a) Semi open impeller
   b) Open impeller pump
6. According to specific speed
   a) Low specific speed or radial flow impeller pump
   b) Shrouded impeller
   c) Medium specific speed or mixed flow impeller pump
   d) High specific speed or axial flow type or propeller pump
7. According to Head(H)
   a) Low head if H<15m br="">b) Medium head if 15c) High head if H>40m

Component of a Centrifugal Pump:

• Impeller is the rotating component of the pump. It is made up of a series of curved vanes. The Impeller is mounted on the shaft connecting an electric motor.
• Casting is an air tight chamber surrounding the impeller. The shape of this casting is designed in such a way that the kinetic energy of the impeller is gradually changed to potential energy. This is achieved by gradually increasing the area of cross section in the direction flow.
• Suction Pipe is the pipe connecting the pump to the sump, from where the liquid has to lift up.
• Foot valve with strainer the foot valve is a non - return valve which permits the flow of the liquid from the sump towards the pump. In other words the foot valve opens only in the upward direction. The strainer is a mesh surrounding the valve; it prevents the entry of debris and silt into the pump.
• Delivery pipe is a pipe connected to the pump to the overhead tank.
• Delivery valve is a valve which can regulate the flow of liquid from the pump.

Advantages of Centrifugal Pumps:

• Its initial cost is low.
• Efficiency is high.
• Discharge is uniform and continuous.
• Installation and Maintenance is easy.
• It can run at high speeds, without the risk of separation of flow.