Ch4_1 overview of sewage treatment

Ch4_1 overview of sewage treatment - Chapter4Overviewof...

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Chapter 4   Overview of  Sewage Treatment Municipal Sewage Characteristics Discharge Regulations Introduction of Sewage Treatment  Process Tour of Sha Tin and Stonecutters  Island Sewage Treatment Plants
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Sewage collection system Sewage treatment work (STW) River or sea
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Wastewater Characteristics  Rags A. Large Suspended Solids Papers Leaves Branches ………. Comminutor Bar Screen (Metcalf & Eddy,1991)
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Sand B. Medium-sized Settleable Solids Silt Food particles Fecal Matter ………. Grit (heavy, easily settleable inorgnaic materials) C. Medium-to-small size Suspended Solids (light, slowly settleable) Pipes Sludge Digester Grit Chamber Settling tank (Metcalf & Eddy,1991)
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D. Non-settleable Particles Micro-organisms Colloids Biological treatment (activated sludge, trickling filter, or rotating biological contactor) Coagulation/Flocculation (Metcalf & Eddy,1991)
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E. Dissolved Pollutants Organics BOD Non-bio degradable Inorganics Biological treatment Carbon Adsorption N, P H 2 S Biological or Chemical Means Pre-aeration Gases Pathogens Disinfection
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Typical Pollutants Concentration in Sewage (Metcalf & Eddy,1991)
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Variations of Sewage Quality (Metcalf & Eddy,1991)
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established from a stand view of “best available technology” consider environmental or purification capacity of a water receiving body depend on usage of a receiving body and types of treatment methods Because limited dilution capacity of receiving water bodies --> higher standards are usually required for large quantity of effluent. The major regulatory items of pollutants are:
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This note was uploaded on 09/13/2011 for the course CIVL 242 taught by Professor Gh during the Fall '09 term at HKUST.

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Ch4_1 overview of sewage treatment - Chapter4Overviewof...

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