Practice Mass Balance for Pollutant in the Lake - 1.7 | 1. Air-Water Exchange | Environmental Quality Monitoring & Analysis, - Vol 5
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Knowledge

1.7 - Mass Balance for Pollutant in the Lake

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

Define what is meant by mass balance.

💡 Hint: Think about how we measure inputs and outputs in a system.

Question 2

Easy

What are the two main components of mass balance?

💡 Hint: Consider the flow of materials.

Practice 4 more questions and get performance evaluation

Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

What is the formula for mass balance?

  • Rate of Output = Rate of Input
  • Rate of Accumulation = Rate of Input - Rate of Output
  • Rate of Accumulation = Rate of Input + Rate of Output

💡 Hint: Think about what accumulates over time.

Question 2

True or False: Evaporation can directly contribute to the input of pollutants into a lake.

  • True
  • False

💡 Hint: Consider where pollutants go.

Solve 1 more question and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

A lake with a depth of 2 meters and a surface area of 5000 m^2 has an initial concentration of pollutant A of 1 kg/m^3. If a factory discharges 200 kg/day into the lake and evaporation removes 50 kg/day, calculate the concentration after three days.

💡 Hint: Consider the overall mass accounting across the time in your calculations.

Question 2

If a pollutant is continuously added to a well-mixed lake, and after three days the concentration is observed to be 1.5 kg/m^3 with continuous inputs of 75 kg/day and evaporation of 25 kg/day, calculate the initial concentration prior to any discharge.

💡 Hint: You will need to set up the mass balance equation to find initial values.

Challenge and get performance evaluation