5. Water Quality

Water Treatment — Quiz

Test your understanding of water treatment with 5 practice questions.

Practice Questions

Question 1

A water treatment plant has a design flow of 5000 m^3/day. If the sedimentation tank surface overflow rate is 1.2 m^3/m^2/h, what surface area is required?

Question 2

To achieve a velocity gradient $G=70\,\mathrm{s^{-1}}$ in a rapid-mix tank of volume $V=10\,\mathrm{m^3}$ with water viscosity $\mu=0.001\,\mathrm{Pa\cdot s}$, what power input $P$ is required (use $P=G^2\mu V$)?

Question 3

For a target CT of 50 mg·min/L with a free chlorine residual of 2 mg/L, what is the minimum contact time required?

Question 4

Which advanced oxidation process primarily uses UV light and hydrogen peroxide to generate hydroxyl radicals?

Question 5

What is a primary disadvantage of ozone disinfection in drinking water treatment?