Aeration filtration disinfection for distribution

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Aeration Filtration Disinfection -- for distribution INDUSTRIAL WATER Sources Surface water Ground water Municipal “tap” (potable) water - residual chlorine often a problem Recycled wastewater - quality often varies Cooling Low quality requirements unless recycled (after use) Problems : biological fouling, solids accumulation, corrosion Minimal treatment required Boiler Potential problems : scale, corrosion, TDS accumulation May require softening, desalination, chelation Process Quality requirements variable ( e.g. , paper, pharmaceuticals) May require extensive treatment: adsorption, desalination, etc.
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PROCESS DESIGN Design and operating parameters Sedimentation Hydraulic residence time – θ = V / Q Hydraulic loading – Q / A S Filtration Hydraulic loading – “head loss”, h L = f(u A , L, d P ) Multiple units required due to backwashing needs Coagulation / Flocculation Hydraulic residence time Coagulant “dosage” Process “vessels” often combined Waste production “sludge” Sizing considerations Potential growth Redundancy Empirical versus theoretical Municipal versus industrial economics (capital cost, payback)
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CHE 3170 Jennings WASTEWATER TREATMENT DOMESTIC WASTEWATER Quality Generalizations – BOD, SS, N, P ( “food” wastes ) Consistency – effect on process design, modeling See Tables 11-1 and 11-2, p.461 in D&M Comparison to industrial wastewaters Source of Contaminants Solids - soil, food waste, sanitary solids Organics - commercial products (soap, perfume, etc.), food waste, etc. Inorganics - commercial products (paint, fertilizer, etc.), salts Biological - bacteria, viruses (in sanitary wastes) Treatment priorities Human health - discharge to surface or ground water Pathogens Toxic metals, organics, carcinogens ( from commercial products ) Aquatic organisms - surface water discharge BOD Toxic metals ( Cu as algacide ), organics ( NH 2 Cl, etc. ) Aesthetics - surface water discharge N, P Oil, grease Solids Treatment processes design parameters Primary treatment - sedimentation – θ = V/Q, Q/A
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  • Fall '11
  • Dr.Jennings
  • Colloids, Removal Processes, D&M

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