Question: Given L0 = 30 (mg/L), D0 = 1 (mg/L), k1 = 0.3 (1/day), k2 = 0.4 (1/day), ds = 10 (mg/L) and the solutions for z(t) and D(t) in Chapter 4. Please draw the Dissolved Oxygen Sag Curve and the curves of z(t) and D(t) as a function of time (day). [The source code or data for your figure has to be turned in, too]

use any program to solve. Matlab or even excell. I also need the code! thanks

Mathematical Model "Z(t) = the amount of oxygen still required at time t , in (mg/L) k,'= the deoxygenation constant, in day-1 depends on the type of waste, the temperature, the stream velocity.. .The rate of change of z over time is proportional to k': 2(t) = Loe- carbonaceous oxygen demand (mg/L), or Lo : the ultimate the amount of oxygen needed to degrade the carbonaceous organic material in the wastewater at the point where the effluent first enters into and mixes with the stream