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Wastewater Treatment SciTeks J Warner 5100 The reason for me doing this report is because I could not attend class enough to grasp the concept of Wastewater Treatment This report is an overview of each stage of the treatment of sewage I have included a diagram of a typical sewage plant A Primary Treatment The wastewater that enters a treatment plant contains debris that might clog or damage the pumps and machinery The material is removed by screens and is burned or buried The wastewater then passes through a comminutor grinder where all the organic material such as leaves are mushed smaller so that they can be removed later 1 Grit Chamber Back in the day long narrow channel-shaped settling tanks known as grit chambers were used to remove all the inorganic substances like sand silt gravel and cinders These chambers were made to allow inorganic particles 0008 in or bigger to settle at the bottom while the smaller particles and most of the organic material that remain in suspension pass through Today spiral-flow aerated grit chambers with hopper bottoms or clarifiers with automatic scrapper arms are used The grit is removed and disposed of as sanitary landfill Grit build up can reach from 3 to 8 cubic feet per1 million gallons of wastewater 2 Sedimentation With the grit removed the wastewater goes into a sedimentation tank where the organic materials removed The method of sedimentation can remove about 20 to 40 percent of the biochemical oxygen demand and 40 to 60 percent of the suspended solids The big boys in the industry use a chemical process known as coagulation and flocculation in the sedimentation tank I really dont know much about this subject so Im going to move on 3 Flotation The alternative to
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