Pollution Engineering - April 2009 - (Page 36) Activated Sludge in INDUSTRIAL APPLICATIONS Sr S =K e So X v bt Sr = BOD removed, mg/L Xvb = active biomass MLVSS, mg/L t = aeration detention time, days K= reaction coefficient, per day Se = effluent BOD, mg/L So = influent BOD, mg/L Figure 3 Three-stage model The Eckenfelder three-stage model takes advantage of the kinetic reaction. Each stage functions as a complete mix reactor. In each stage the reaction rate is a function of the residual organic concentration. This is shown in Figure 2. Stage 3 Stage 2 Stage 1 Sr X v bt K • Volatile Organic • Hazardous Air Air Volatile Organic • Hazardous Compounds (VOCs) Pollutants (HAPs) Compounds (VOCs) Pollutants (HAPs) • Nitrous Oxides (NOx) • Odorous Emissions Nitrous Oxides (NOx) • Odorous Emissions Figure 2 se so REGULATORY COMPLIANCE GUARANTEED! REGULATORY COMPLIANCE GUARANTEED! • Regenerative, Catalytic, Recuperative • Regenerative, Catalytic, Recuperative and Halogenated Oxidizer Systems and Halogenated Oxidizer Systems • 99% + Destruction Rate Efficiencies • 99% + Destruction Rate Efficiencies • Cost-Effective, Clean Air Solutions • Cost Effective, Clean Air Solutions • Over 1,600 Installed Systems • Over 1,600 Installed Systems • Seamless Integration Into Process • Seamless Integration Into Process • Oxidizer Service Capabilities, • Oxidizer Service Capabilities, Regardless ofOf Original Manufacturer Regardless Original Manufacturer 8855 N. 55th St. • Milwaukee, WI 53223 • 8855 N. 55th St. Milwaukee, 53223 The kinetics of a multi-component organic mixture relates the removal rate to the fraction of organic remaining. In which: Sr = BOD removal, mg/L Se = effluent concentration, mg/L So = influent concentration, mg/L Xva = active biomass, mg/L k = rate coefficient, per day t = time, day Sr Se =k a So Xt va In a complete mix process, the removal rate will be governed by the concentration in the reactor or the effluent concentration. A maximum removal rate in the first stage will be limited to the oxygen transfer from 750 HP/Mgal. The second and third stages (800) 488-0230 (800) 488 -0230 www.anguil.com www.anguil.com Pollution Engineering APRIL2009 36
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