M

(c) Dry-well centrifugal (d) Dry-well self-priming pump pump

(b) Wet-well submersible pump

(c) Dry-well centrifugal (d) Dry-well self-priming pump pump

^ Discharge check valve

FIG. 7.12.1 Types of pumps and pumping stations.

(g) Pneumatic ejector e) Airlift pump

(f) Screw pump

^ Discharge check valve

FIG. 7.12.1 Types of pumps and pumping stations.

(g) Pneumatic ejector

Discharge

Hoist

Discharge e) Airlift pump

(f) Screw pump pump is rarely used in water or wastewater processing. Frequently, a piston or plunger is used in a cylinder, which is driven forward and backward by a crankshaft connected to an outside drive. Adjusting metering pump flows involves merely changing the length and number of piston strokes. A diaphragm pump is similar to a reciprocating piston or plunger, but instead of a piston, it contains a flexible diaphragm that oscillates as the crankshaft rotates.

FIG. 7.12.2 Types of centrifugal pump impellers. A. Closed impeller; B. Semiopen impeller; C. Open impeller; D. Diffuser; E. Mixed flow impeller; F. Axial flow impeller.

FIG. 7.12.2 Types of centrifugal pump impellers. A. Closed impeller; B. Semiopen impeller; C. Open impeller; D. Diffuser; E. Mixed flow impeller; F. Axial flow impeller.

clogging features. In addition using more than one impeller can increase the lift characteristics. These pumps can have a horizontal or vertical design.

Applications

Plunger and diaphragm pumps feed metered amounts of chemicals (acids or caustics for pH adjustment) to a water or waste stream. They also pump sludge and slurries in waste treatment plants.

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