Sewage pumps transport heavily polluted water, which often contains solid particles of various organic, inorganic and mineral origin. Generally, single-stage pumps that are not self-priming are preferred. They are completely immersed in the fluid being processed. Wear-resistant mechanical seals are used as shaft seals.
Typical applications are food processing, construction, pulp and paper, sugar and metal industries (e.g. metal electrolysis) as well as mining and water extraction (e.g. cooling water, seawater desalination) industries. A distinction is made between urban and industrial sewage pumps because the requirements differ significantly. Urban wastewater pumps, also called sewage pumps, pump raw sewage, mechanically treated wastewater from treatment tanks, sludge (e.g. activated, raw, digestate and reactivated sludge) and rainwater.
Industrial wastewater pumps pump a wide variety of fluids. These fluids may be domestic wastewater or may contain chemical or industrial wastes mixed with production residues. These fluids can sometimes be quite aggressive or corrosive. The pump casing can therefore be equipped with casing wear rings or wear plates that are made of particularly wear-resistant materials and can be easily replaced.
While wastewater pumps can be horizontal or vertical shafts, submersible pumps that operate completely in the fluid are often preferred. While KSB's Sewatec model is an open impeller dry-running pump that can be preferred as an above-ground wastewater pump, the Amarex KRT model is a submersible wastewater pump that works entirely in liquid.
Source: KSB Global
