A lagoon with volume 1200 m^3 has been receiving a steady flow of a conservative waste at a rate of 100m^3/day for a long enough time to assume that steady-state conditions apply. The waste entering the lagoon has a concentration of 10mg/L. Assuming completely mixed conditions,
a) what would be the concentration of pollutant in the effluent leaving the lagoon?
b) If the input waste concentration suddenly increased to 100mg/L, what would the concentration in the effluent be 7 days later?
2. repeat problem 1 for a nonconservative pollutant with reaction rate K = 0.20/d© BrainMass Inc. brainmass.com October 9, 2019, 6:16 pm ad1c9bdddf
Please see the attached files.
Let C1 be the concentration (mg/L) of the stream coming in the lagoon.
Let C be the concentration (mg/L) of the stream coming out of the lagoon.
Let V1 be the volumetric flowrate (m3/s) of the stream coming in the lagoon.
Let V2 be the volumetric flowrate (m3/s) of the stream coming out of the lagoon.
Volume of lagoon VL = 1200 (m3) = 1.2*106 (L)
V1 = 100 (m3/day) = 105 (L/day)
C1 = 10 (mg/L)
Part 1: No reaction
Perform material balance for the lagoon
Rate of change of material = Rate of mass in - Rate of ...
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