2.1. Modeling of Pollutant Transport

Try these first

1. 1.

   Define a well-mixed system.

   Hint

   Think about how mixing affects concentration.

2. 2.

   What is a mass balance?

   Hint

   Consider how substances accumulate.

3. 3.

   What does a well-mixed system ensure?

   • Uniform concentration
   • Varying concentrations
   • No flow

   Hint

   Consider the definition of well mixed.

4. 4.

   True or False: Steady-state systems can have fluctuating concentrations.

   • True
   • False

   Hint

   Think about the implications of steady-state.

5. 5.

   Given a lake where the inflow of pollutants is 10 g/day and the evaporation rate is 3 g/day. Develop the mass balance equation for the lake and calculate the concentration after one day assuming the lake has a volume of 1000 L.

   Hint

   Use the mass outflow and inflow rates to determine the change in concentration.

6. 6.

   Discuss the real-world application of box models in a specific river system, noting any simplifications that may be required.

   Hint

   Consider how segmentation might ignore localized events but simplify overall modeling.