Wastewater Treatment
The reason for me doing this report is because I could not attendclass enough to grasp the concept of Wastewater Treatment. This report isan overview of each stage of the treatment of sewage. I have included a diagram of a typical sewage plant. The wastewater that enters a treatment plant contains debris thatmight clog or damage the pumps and machinery. The material isremoved by screens, and is burned or buried. The wastewater then passesthrough a comminutor (grinder), where all the organic material such asleaves are mushed smaller so that they can be removed later. Back in the day, long narrow channel-shaped settling tanks, knownas grit chambers, were used to remove all the inorganic substances likesand, silt, gravel, and cinders. These chambers were made to allowinorganic particles 0.008 in. or bigger to settle at the bottom while thesmaller particles and most of the organic material that remain insuspension pass through. Today, spiral-flow aerated grit chambers withhopper bottoms, or clarifiers with automatic scrapper arms
5) Drying The digested sludge is place on sand beds for air drying. Dried sludge in most cases is used as a fertilizer because ofthe 2 percent nitrogen and 1 percent phosphorus content. Thegrit is removed and disposed of as sanitary landfill. A decrease in BOD of 75 to 85 percent can beaccomplished. 1) Trickling Filter In this process, a waste stream is sent over a bed or column of sometype of porous medium. The organic acids are then resolved to methane and carbondioxide by bacteria. Organic matter is assimilated by the floc and changedto aerobic output. The sludge that is to thick is heated and added tothe digester as many times as possible, where it sits for 10 to 30 days and isdecomposed. 2) Sedimentation With the grit removed, the wastewater goes into a sedimentationtank, where the organic materials removed. com 2) Microsoft Encarta Encyclopedia 99 (1999). The area near thesurface is aerobic, allowing the oxidation of dissolved and homogenousmixture of organic matter. 2) Activated Sludge This stage is an aerobic process that adds sticky sludge particlesthat have millions of of actively growing bacteria stuck together by agelatinous slime.
Common topics in this essay:
Grit Chamber,
Digestion Digestion,
Secondary Treatment,
Pond Lagoon,
Trickling Filter,
Activated Sludge,
Primary Treatment,
Wastewater Treatment,
SciTeks Warner,
Refreshed Daily,
wastewater treatment,
organic matter,
organic material,
suspended solids,
percent suspended,
secondary treatment,
carbon dioxide,
85 percent,
percent suspended solids,
60 percent,
stabilization pond lagoon,
stabilization pond,
60 percent suspended,
methane carbon dioxide,
40 60 percent,
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Acceptance Essays
