1
How did the Stargard project redesign the layout of mixers in the tank?
2
Where do vortices develop if the propeller is too close to the water surface?
3
What are deadzones?
5
What is the aim of thrust-to-power sizing?
6
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: Where do vortices develop if the propeller is too close to the water surface?
A: At the front of the propeller
02.
Q: Where do vortices develop if the propeller is too close to the water surface?
A: At the rear of the propeller
02.
Q: Where do vortices develop if the propeller is too close to the water surface?
A: Underneath the propeller
03.
Q: What are deadzones?
A: Areas that are compromised during the mixing process
03.
Q: What are deadzones?
A: Areas consisting of infected water
03.
Q: What are deadzones?
A: Areas in which the homogeneity is high
04.
Q: How much was the average velocity of the volume improved by?
A: 20%
04.
Q: How much was the average velocity of the volume improved by?
A: 25%
04.
Q: How much was the average velocity of the volume improved by?
A: 30%
05.
Q: What is the aim of thrust-to-power sizing?
A: Maintain a steady momentum and a constant required thrust rate
05.
Q: What is the aim of thrust-to-power sizing?
A: Deliver a sufficient thrust with the least possible energy consumption
05.
Q: What is the aim of thrust-to-power sizing?
A: Run the power at the limit to deliver maximum thrust when necessary
06.
Q: Why is it important to position mixers correctly?
A: To prevent the propellers from breaking
06.
Q: Why is it important to position mixers correctly?
A: To neutralise vortices
06.
Q: Why is it important to position mixers correctly?
A: To maximise the total bulk flow