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).
Comminuting and grinding devices are installed in the wastewater flow channel to grind and shred material up to 6 to 19 mm (0.25 to 0.75 in) in size. Comminutors consist of a rotating slotted cylinder through which wastewater flow passes. Solids that are too large to pass through the slots are cut by blades as the cylinder rotates, reducing ...
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