### 20 - Mixing in Wastewater Treatment

This course test contains 6 questions and can be retaken at any time.

You must answer all questions correctly to pass the test and complete the course.

Which of these describe the specific mixing power?

Where do vortices develop if the propeller is too close to the water surface?

Which of these isn’t a main target for wastewater mixers?

Why is it important to position mixers correctly?

How much was the average velocity of the volume improved by?

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Q: Which of these describe the specific mixing power?
A: The ratio between the propeller power and the liquid volume
Q: Which of these describe the specific mixing power?
A: The ratio between the liquid volume and the solid particles
01: The ratio between the propeller power and the liquid volume
02: The ratio between the liquid volume and the solid particles Your answer
03: The ratio between the propeller power and propeller size
Q: Which of these describe the specific mixing power?
A: The ratio between the propeller power and propeller size
01: The ratio between the propeller power and the liquid volume
02: The ratio between the liquid volume and the solid particles
03: The ratio between the propeller power and propeller size Your answer
Q: Where do vortices develop if the propeller is too close to the water surface?
A: At the front of the propeller
02: At the rear of the propeller
03: Underneath the propeller
Q: Where do vortices develop if the propeller is too close to the water surface?
A: At the rear of the propeller
Q: Where do vortices develop if the propeller is too close to the water surface?
A: Underneath the propeller
01: At the front of the propeller
02: At the rear of the propeller
A: Areas that are compromised during the mixing process
A: Areas consisting of infected water
01: Areas that are compromised during the mixing process
03: Areas in which the homogeneity is high
A: Areas in which the homogeneity is high
01: Areas that are compromised during the mixing process
02: Areas consisting of infected water
Q: Which of these isn’t a main target for wastewater mixers?
A: To blend liquid with solid particles
02: To ensure quick drainage from the tank
03: To keep solid particles in suspension
Q: Which of these isn’t a main target for wastewater mixers?
A: To ensure quick drainage from the tank
Q: Which of these isn’t a main target for wastewater mixers?
A: To keep solid particles in suspension
01: To blend liquid with solid particles
02: To ensure quick drainage from the tank
Q: Why is it important to position mixers correctly?
A: To prevent the propellers from breaking
02: To neutralise vortices
03: To maximise the total bulk flow
Q: Why is it important to position mixers correctly?
A: To neutralise vortices
01: To prevent the propellers from breaking
03: To maximise the total bulk flow
Q: Why is it important to position mixers correctly?
A: To maximise the total bulk flow
Q: How much was the average velocity of the volume improved by?
A: 20%