Screens
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| Screens |
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Screening was one of the earliest methods for removing contaminants from wastewater. In modern wastewater treatment plants both coarse and fine screens are routinely used. The main screen types are the bar, trash, slotted, wedge and woven wire designs. The size of aperture or opening is determined by analysis of wastewater composition and flow rate. Bar and trash screens are effective in removing gross pollutants. Slotted screens on the other hand offer the ability to remove less coarse material, but are rarely found with openings smaller than 5 mm because of inherent blinding problems. Wedge wire screens marked the next advancement in screening, and generally offer the ability to remove material as small as 1 mm in size. These types of screen can result in biological oxygen demand (BOD) and suspended solids (SS) removal in the order of 25 to 35%, and are becoming more commonly used inpre-treatment service. |