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3.8.1 - Describe the types of pumps used in wastewater treatment. (EQUIPMENT)
Terms in this set (36)
List the types of pumps used in wastewater treatment:
Positive Displacement Piston Pump
Rotary Lobe Pump
Progressive Cavity Pump
Describe the valves used in a wastewater treatment plant:
Valves are devices placed in piping systems to stop, regulate, divert, or change flow. Proper procedures for opening and closing valves must be followed to prevent personal injury and equipment damage. Valves used in wastewater treatment plants are:
What are the Total Number of Valves in the Study Guide ?
The 10 valves are divided into 3 types. What are they ?
Multi Turn Valves
Quarter Turn Valves
Self Actuated Valves
Define Gate Valve
A general service valve used mostly for full open flow or no flow applications. This valve is closed using a gate or plate that slides the valve down to block the flow.
List the Multi Turn Valves
Define Globe Valve
A valve used for full flow or no flow applications as well as throttling clean water flows. This valve is closed by a flat or convex plug that is lowered onto a matching seat.
Define Diaphragm Valve
A valve often used for corrosive wastewaters. It is closed by a flexible diaphragm that is attached to a compressor. The diaphragm is lowered by the valve stem onto a weir, sealings and shutting off the flow
Define Pinch Valve
A valve often used on sludge lines or wastewater with a high amount of suspended solids. The valve is closed by a flexible member in a valve that can be pinched close to shut off flow.
List the Quarter Turn Valves
Define Needle Valve
A valve used for regulating flow in small lines, such as instrument air lines or fuel lines. A rod with a cone shaped tip is raised and lowered relative to a seat, thus creating a certain size opening for which flow to pass.
Define Plug Valve
A valve used for on-off and some throttling application. It is closed by turning a cylindrical or tapered plug with a hole in the center. When open to allow full flow, the hole lines up directly with the flow path. A quarter turn in either direction blocks the flow.
Define Ball Valve
A valve used for on-off and some throttling applications. It operates similarily to a plug valve but uses a rotating ball with a hole in the center. When open to allow full flow, the hole lines up directly with the flow path. When closed, the ball is rotated 90 degrees to block the flow.
Define Butterfly Valve
A valve used for on-off and good for throttling applications. A butterfly valve regulates flow by turning a circular disk or vane. When open to allow for full flow, the vane is directly parallel to the flow. When closed, the vane is perpendicular to block the flow.
List the Self Actuated Valves
Define Check Valve
A valve used to allow flow in one direction. It operates by the flow in the desired direction opening the valve while flow backwards forces it closed.
Define Relief Valve
A valve is used to prevent excessive pressure. It operates by releasing pressure if the safety limit is exceeded. Once the pressure drops to a present level, the valve closes again.
Define Centrifugal Pump
A pump with an impeller that rotates in a casing to pump large volumes of liquid through a pipe. A centrifugal pump is the most commonly used wastewater pump. They are used most commonly for raw wastewater pumping; at lift stations, recirculation flows, for return activated sludge, waste activated sludge, and final effluent pumping.
Define Submersible Pump
The pump and motor combination are submerged in the liquid being pumped. They are a type of centrifugal pump often used for lift stations and wet wells.
Define Positive Displacement Piston Pump
This type of pump operates using a piston in a reciprocating motion to pump fluids (similar to the piston in an automotive engine). These pumps are commonly used for pumping sludges.
Define Rotary Lobe Pump
A pump used to pump both sewage and sludge. They are self-priming, valveless, positive displacement pumps. Two synchronized rotors rotating against each other create chambers between the lobes and pump casing. At the suction side the open chambers fill with the sewage or sludge. The sewage or sludge is displaced in the direction of the volume flow into the discharge side. When not operating, the rotors align and form a seal.
Define Peristaltic Pump
A small positive displacement pump commonly used for sampling and chemical addition.
Define Progressive Cavity Pump
A fixed flow rate pump that turns a corkscrew shaped rotor inside a flexible rubber stator to transfer sludges. These pumps offer long life and reliable service as long as they don't run dry or with excessive grit.
Define Airlift Pump
A pump used mostly used in small activated sludge plants to return and waste sludge from the system.
They operate on the principle of water/air displacement.
Airlift pumps are prone to plugging, especially at low return flow rates.
Operators should closely monitor these pumps often to ensure sludge is being returned at all times.
Define Diaphragm Pump
A type of positive displacement pump. They differ from other positive displacement pumps in that the pumping mechanism is protected from the material being pumped. They are often used for adding chemicals or polymers. Larger diaphragm pumps are used for pumping sludge.
Define Trash Pump
They are usually gasoline or diesel operated positive displacement portable pumps with a suction hose and a discharge hose. They are non-clogging, (can handle a 3 or 4 inch diameter object without clogging). They are used for moving large volumes of wastewater quickly such as, dewatering, bypassing, emptying treatment tanks, etc.
Centrifugal Pump Diagram
Submersible Pump Diagram
Positive Displacement Piston Pump Diagram
Rotary Lobe Pump Diagram
Peristaltic Pump Diagram
Progressive Cavity Pump Diagram
Airlift Pump Diagram
Diaphragm Pump Diagram
Trash Pump Diagram
THIS SET IS OFTEN IN FOLDERS WITH...
Chapter 3: Wastewater Treatment Facilities
3.8 - Equipment
8b. Wastewater Treatment Plants
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