T11 - Tutorial 11 TA: Pang Shing Kin (ceskin@ust.hk) So...

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Unformatted text preview: Tutorial 11 TA: Pang Shing Kin (ceskin@ust.hk) So Wing Kin (ceso@ust.hk) CIVL 242 Water and Wastewater Engineering Kinetics of BOD removal by biomass Monod Equation CIVL 242 Water and Wastewater Engineering Standard bacterial growth curve The phases of growth typically observed include: 1. lag phase 2. exponential (log, logarithmic) phase 3. stationary phase 4. death phase (exponential or logarithmic decline) Kinetics of BOD removal by biomass Monod Equation CIVL 242 Water and Wastewater Engineering Assumed that it was limitation of nutrients and not cell death that ended the exponential phase of growth, and that growth is proportional to the concentration of the nutrient when looking at individual cells Kinetics of BOD removal by biomass Monod Equation CIVL 242 Water and Wastewater Engineering X S S K S m dt dS + =- X S K S Y dt dX S m + = utilized food L mg produced biomass L mg t coefficien yield Y / / = = Substrate utilization: Bacterial growth: X = concentration of active biomass [mg/L] m = maximum specific substrate utilization rate [t-1 ] K S = half-maximum rate concentration [mg/L] S = limiting substrate concentration [mg/L] X k X S S K S m Y dt dX d- + = Net growth: Oxygen Requirement Bacteria Oxidization ) / ( 42 . 1 5 2 2 7 5 2 mgMLVSS mgO NO H C O MLVSS BOD P U = = = CIVL 242 Water and Wastewater Engineering Bacteria (C 5 H 7 NO 2 ) +5O 2 5CO 2 +2H 2 O+NH 3 ) / 2 ( 14 . 1 mgMLSS mgO MLSS U BOD P = = V MLSS K BOD BOD BOD BOD Q YP O Total d U out in + - - = ] [ 14 . 1 ) ( ) ( ) 1 ( 5 , 5 , 5 2 Total O 2 needed = O 2 for substrate oxidized + O 2 for respiration V ] MLSS [ K MLSS d = CIVL 242 Water and Wastewater Engineering...
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T11 - Tutorial 11 TA: Pang Shing Kin (ceskin@ust.hk) So...

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