Development Of And Application Of The Swirl And Helical Bend Devices For Combined Sewer Overflow Abatement And Runoff Control PDF Download

Swirl and helical bend devices were studied for three years at Lancaster, PA, and West Roxbury in Boston, MA. At Lancaster the study included: A full-scale swirl regulator/solids concentrator (SRC) for combined sewer overflow (CSO) control (24-ft (7.3-m) diameter) and a swirl degritter for SRC foul underflow (8-ft (2.4-m) diameter). At West Roxbury the study included: A pilot-scale SRC for separate urban stormwater treatment (10.5-ft (3.2-m) diameter) and a pilot-scale helical bend regulator/solids concentrator (HBRC) for separate urban stormwater treatment (60-ft (18.3-m) long). Data from the Lancaster facility indicated that the SRC is an efficient treatment device to remove heavier or 'first flush'-related suspended solids and grit. At West Roxbury, efficiencies were low for both units and appear to be related to very low settling velocities of the suspended solids.