2. Introduction to River Systems and Contaminated Sediment

Try these first

1. 1.

   What does DNAPL stand for?

   Hint

   What type of liquid has a density greater than water?

2. 2.

   Name the three components of a river system.

   Hint

   Think about the environment around a river.

3. 3.

   What does the term DNAPL refer to in environmental science?

   • Dense non-aqueous phase liquid
   • Density neutral aqueous phase liquid
   • Dry non-aqueous phase liquid

   Hint

   Consider what happens when different types of liquids spill into water.

4. 4.

   True or False: DNAPLs float on water due to their density.

   • True
   • False

   Hint

   Recall the properties of density comparisons.

5. 5.

   Calculate the impact of a DNAPL spill in a hypothetical river where the flux from sediment is observed to be 0.1 mg/L/day. If the goal is to keep the concentration in the water below 0.05 mg/L, what measures could be taken to mitigate this?

   Hint

   Consider both physical dilution methods and chemical treatment options.

6. 6.

   Discuss a scenario where a river with frequent DNAPL spills shows a significant reduction in biodiversity. Evaluate the ecological impacts of such contamination.

   Hint

   Think about which organisms are most affected by contaminants.