1
How did the Stargard project redesign the layout of mixers in the tank?
2
What is the aim of thrust-to-power sizing?
3
Which of these isn’t a main target for wastewater mixers?
4
Where do vortices develop if the propeller is too close to the water surface?
5
Why is it important to position mixers correctly?
Test results
Congratulations. You have passed the test and completed the Mixing in Wastewater Treatment
Achieved badges:
01.
Q: How did the Stargard project redesign the layout of mixers in the tank?
A: They gathered four mixers in the middle of the tank
01.
Q: How did the Stargard project redesign the layout of mixers in the tank?
A: They spread four mixers across the tank
01.
Q: How did the Stargard project redesign the layout of mixers in the tank?
A: They remained in the same position, but were replaced with more powerful mixers
02.
Q: What is the aim of thrust-to-power sizing?
A: Maintain a steady momentum and a constant required thrust rate
02.
Q: What is the aim of thrust-to-power sizing?
A: Deliver a sufficient thrust with the least possible energy consumption
02.
Q: What is the aim of thrust-to-power sizing?
A: Run the power at the limit to deliver maximum thrust when necessary
03.
Q: Which of these isn’t a main target for wastewater mixers?
A: To blend liquid with solid particles
03.
Q: Which of these isn’t a main target for wastewater mixers?
A: To ensure quick drainage from the tank
03.
Q: Which of these isn’t a main target for wastewater mixers?
A: To keep solid particles in suspension
04.
Q: Where do vortices develop if the propeller is too close to the water surface?
A: At the front of the propeller
04.
Q: Where do vortices develop if the propeller is too close to the water surface?
A: At the rear of the propeller
04.
Q: Where do vortices develop if the propeller is too close to the water surface?
A: Underneath the propeller
05.
Q: Why is it important to position mixers correctly?
A: To prevent the propellers from breaking
05.
Q: Why is it important to position mixers correctly?
A: To neutralise vortices
05.
Q: Why is it important to position mixers correctly?
A: To maximise the total bulk flow
06.
Q: How much was the average velocity of the volume improved by?
A: 20%
06.
Q: How much was the average velocity of the volume improved by?
A: 25%
06.
Q: How much was the average velocity of the volume improved by?
A: 30%