Transcription of Environmental Protection Agency Wastewater Technology …
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Environmental Protection Agency Wastewater Technology …
United StatesEnvironmental ProtectionAgencyWastewater Technology Fact SheetScreening and Grit RemovalDESCRIPTIONW astewater contains large solids and grit that caninterfere with treatment processes or cause unduemechanical wear and increased maintenance onwastewater treatment equipment. To minimizepotential problems, these materials require separatehandling. Preliminary treatment removes theseconstituents from the influent treatment consists of screening, gritremoval, septage handling, odor control, and flowequalization. This fact sheet discusses screeningand grit is the first unit operation used atwastewater treatment plants (WWTPs). Screeningremoves objects such as rags, paper, plastics, andmetals to prevent damage and clogging ofdownstream equipment, piping, and modern Wastewater treatment plants use bothcoarse screens and fine screens. Figure 1 depicts atypical bar screen (a type of coarse screen).Coarse ScreensCoarse screens remove large solids, rags, and debrisfrom Wastewater , and typically have openings of 6mm ( in) or larger.
particles are accelerated and diverge from the streamlines, dropping to the bottom of the tank, while lighter organic particles are suspended and eventually carried out of the tank. Vortex-Type Grit Chamber The vortex-type grit chamber consists of a cylindrical tank in which the flow enters tangentially, creating a vortex flow pattern. Grit
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