This design manual contains descriptions of design procedures and operating experience to date, including results obtained, for secondary flow pollution control devices. Two types of combined sewer overflow regulators are described: the swirl and the helical bend regulator/separator. Both unitsare static, that is, operate withoutmoving parts and require no outside source of power. Both can remove up to 50 percent of the suspended solids. Both are also effective for treating separate stormwater discharges. Both serve a dual function - treatment and regulation of the flow. The units treat waste flows by concentrating the solids in a small fraction of the total flow. This reduced volume becomes economical, or in effect, possible to treat in conventional wastewater treatment facilities. The swirl degritter is also described. The unit's high efficiency and essential lack of moving parts makes it suitable for use with stormwater, sanitary sewage and raw potable water to protect pumps, wet-wells and downstream facilities from grit. A primary treatment device and a sediment load polishing unit are also described. In addition, several devices and applications which have been developed by others as a result of the basic information on the flow field characteristics and capabilities are described.

At head of title: Design manual. "American Public Works Association." "July 1982." Includes bibliographical references. "EPA-600/8-82-013." "Grant no. R803157."