4.3. Unsteady State Process

Try these first

1. 1.

   What is a DNAPL?

   Hint

   Think about density relative to water.

2. 2.

   What does LNAPL stand for?

   Hint

   Remember, these are less dense than water.

3. 3.

   What type of liquid is a DNAPL?

   • Less dense than water
   • Equal density to water
   • More dense than water

   Hint

   Recall the characteristics of DNAPLs.

4. 4.

   True or False: LNAPLs float on water.

   • True
   • False

   Hint

   Consider the density difference.

5. 5.

   Calculate the time it would take for a spilled DNAPL to fully dissolve in a body of water given its known mass transfer coefficient.

   Hint

   Remember to assess both the surface area and the concentration discrepancy.

6. 6.

   Propose a remediation strategy for a historically contaminated sediment site and explain its feasibility based on the transport mechanisms discussed.

   Hint

   Evaluate how historical effects influence present decisions.