Select sludge and wastewater pumps by type, manufacturer and duty — progressive-cavity, rotary-lobe, chopper, grinder, screw-centrifugal, self-priming, submersible, peristaltic and air-operated diaphragm pumps for raw sewage, primary, secondary (WAS) and thickened sludge, scum and FOG. Full data for every pump: best-efficiency flow, NPSHr, maximum pressure, viscosity range and materials of construction.
Sludge is non-Newtonian, abrasive, stringy and gassy, and its apparent viscosity rises steeply with dry-solids content — so pump choice is driven by the solids type and concentration, not just flow and head. Low-shear progressive-cavity and rotary-lobe pumps suit thickened and digested sludge and polymer dosing; chopper and grinder pumps cut rag and solids in raw sewage; submersible and self-priming pumps handle wet-well and storm duties; screw-centrifugal (Hidrostal-type) pumps pass large solids gently.
Pump data is from manufacturer references; confirm the duty point, solids rating and certified curve with the manufacturer before selection.
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