Oxygen levels downstream of a sewage point discharge reach some minimum 'sag' point according to the...
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Oxygen levels downstream of a sewage point discharge reach some minimum 'sag' point according to the Streeter-Phelps model as shown in Figure 2. (mg/L) LITHEHEN 10 r (d) 15 20 Figure 2: A dissolved oxygen 'sag below a point of sewage discharge into a river. Streeter-Phelps Model: 0 = 0 North (1) kal e kg-k-ka where o- dissolved oxygen (mg/L), o, - oxygen saturation concentration (mg/L), 7-travel time (d). = biochemical oxygen demand (BOD) concentration at the mixing point (mg/L), k, = rate of decomposition of BOD (d), k-rate of settling of BOD (d), k, -aeration rate (d), and S, - sediment oxygen demand (mg/(L-d)). a) Using prebuilt python functions, write a script that determines what the critical oxygen level will be (minimum oxygen concentration) and when it will occur (i.e. how many days downstream) given the following values: 0 = 10mg ka = 0.1d-, ka = 0.6d, k, = 0.05d, Lo some, L Sp = 1mg/(Ld) b) Plot oxygen concentration over time. c) This point is where lifeforms will be the most stressed; will this level of oxygen support most aquatic life? Oxygen levels downstream of a sewage point discharge reach some minimum 'sag' point according to the Streeter-Phelps model as shown in Figure 2. (mg/L) LITHEHEN 10 r (d) 15 20 Figure 2: A dissolved oxygen 'sag below a point of sewage discharge into a river. Streeter-Phelps Model: 0 = 0 North (1) kal e kg-k-ka where o- dissolved oxygen (mg/L), o, - oxygen saturation concentration (mg/L), 7-travel time (d). = biochemical oxygen demand (BOD) concentration at the mixing point (mg/L), k, = rate of decomposition of BOD (d), k-rate of settling of BOD (d), k, -aeration rate (d), and S, - sediment oxygen demand (mg/(L-d)). a) Using prebuilt python functions, write a script that determines what the critical oxygen level will be (minimum oxygen concentration) and when it will occur (i.e. how many days downstream) given the following values: 0 = 10mg ka = 0.1d-, ka = 0.6d, k, = 0.05d, Lo some, L Sp = 1mg/(Ld) b) Plot oxygen concentration over time. c) This point is where lifeforms will be the most stressed; will this level of oxygen support most aquatic life?
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Solutions Step 1 Answer To determine the critical oxygen level downstream using the StreeterPhelps model well use the provided formula and given value... View the full answer
Related Book For
Numerical Methods For Engineers
ISBN: 9780071244299
5th Edition
Authors: Steven C. Chapra, Raymond P. Canale
Posted Date:
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