Using Mat Lab only:

Problem 4. Dissolved oxygen is frequently compromised downstream of waste-water treatment plants. The following equation estimates oxygen downstream of a plant kaLo 1-e -ka k, ka where A oxygen concentration (mg/L), A saturated oxygen concentration, t travel time (d), Lo biochemical oxygen demand at the mixing point, kd decomposition rate of BOD (d-1), ks settling rate (d-1), ka reaeration rate (d-1), and Sb sediment oxygen demand (mg/L/d). Suppose you have the following parameters: As 10 mg/L, LOE 50 mg/L, kd 0.1 d 1, k 0.04 d-1, ka 0.65 d-1, and Sb 1 mg/L/ Determine the critical time and concentration for observed sag in dissolved oxygen while oxygen is initially consumed faster than reaeration of oxygen into the stream Problem 4. Dissolved oxygen is frequently compromised downstream of waste-water treatment plants. The following equation estimates oxygen downstream of a plant kaLo 1-e -ka k, ka where A oxygen concentration (mg/L), A saturated oxygen concentration, t travel time (d), Lo biochemical oxygen demand at the mixing point, kd decomposition rate of BOD (d-1), ks settling rate (d-1), ka reaeration rate (d-1), and Sb sediment oxygen demand (mg/L/d). Suppose you have the following parameters: As 10 mg/L, LOE 50 mg/L, kd 0.1 d 1, k 0.04 d-1, ka 0.65 d-1, and Sb 1 mg/L/ Determine the critical time and concentration for observed sag in dissolved oxygen while oxygen is initially consumed faster than reaeration of oxygen into the stream