Question

Given that a water reservoir has a volume of 93 km3 (assume the depth of 1 m), two rivers
flowing in at flow rates, Fa and Fb, of 100,000m3
day−1 and 30,000m3
day−1, respectively. If
two factories discharging in an inert pollutant Z, and that
1) Factory 1 has a flow rate, F1, equal to 35,000 m3
day−1, and pollutant Z concentration,
CZ1, equal to 400 mgL−1;
2) Factory 2 has a flow rate, F2, equal to 2,000 m3
day−1, and pollutant Z concentration,
CZ2, equal to 85 mgL−1
If steady-state conditions are obtaining,

a) Calculate the pollutant concentration in a lake that receives wastewater from the two
factories. Make the system sketch and set the system boundaries. Make all the necessary
assumptions for the calculation. {13}
b) Calculate the pollutant concentration in a lake that receives wastewater from the two
factories, given that the first river also starts bringing in pollutant Z at a concentration, CZa,
equal to 20 mgL−1.

Answer 1

Answer:

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