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The Evolution of Effluent Sewers

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Abstract:

Effluent sewers have evolved since the late 1960's, when they were proposed as a solution for sewering rural communities. Effluent sewers were derived from the technology used in pressure sewers with grinder pumps. The first effluent sewers included an on-lot septic tank and a low-head centrifugal effluent pump installed in a separate dosing tank. Solids settled in the septic tank and the pump conveyed liquid effluent to a common sewer main. Effluent sewer equipment and design procedures have continued to evolve. Advances such as watertight tanks to eliminate infiltration and inflow, screened pump vault units that negate the need for a dosing tank in many jurisdictions, remote site management through telemetry control panels, improvements in directional boring techniques, and refined design procedures have made effluent sewers – both pressurized (septic tank effluent pumping – STEP) and non-pressurized (septic tank effluent gravity – STEG) more widely accepted across the world. A growing body of data shows effluent sewers can be managed effectively and cost efficiently.

Keywords: STEG; STEP; Wastewater treatment; effluent sewers; hydraulic grade; pressure sewers

Document Type: Research Article

DOI: https://doi.org/10.2175/193864711802720885

Publication date: 2011-01-01

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