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3 cards from this section. Quick, good the night before a test.
What does mass balance account for in a system?
Think about input, output, and change in the system.
What is meant by unsteady state?
Consider how concentrations evolve in a flowing water system.
What does the mass balance equation help to determine?
This equation balances in terms of input and output.
True or False: In a steady state, the concentration of pollutants changes over time.
Think about what steady means in terms of flow and concentration.
Consider a lake with an inflow of 500 L/day and an outflow of 300 L/day. If a pollutant is generated at 100 mg/day and lost at 30 mg/day due to evaporation, calculate the change in concentration over a day assuming the lake's volume is constant.
Use the mass balance equation and factor the pollutant generated and lost.
If a segment of river initially has a concentration of 200 mg/L and receives an additional inflow of 100 mg/L from tributaries, calculate the new concentration assuming the flow is steady.
Consider both the main river flow and tributary contributions for average concentration.
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