6. Pollution and Policy
Water Pollution — Quiz
Test your understanding of water pollution with 5 practice questions.
Practice Questions
Question 1
Which water quality parameter is assessed by the biochemical oxygen demand ($\mathrm{BOD}_5$) test?
Question 2
A wastewater treatment plant reduces influent BOD from 200 mg/L to effluent BOD of 20 mg/L. What is the percent removal efficiency?
Question 3
Which is the primary objective of tertiary wastewater treatment?
Question 4
If biochemical oxygen demand decays according to first-order kinetics with rate constant $k=0.3\,\mathrm{day}^{-1}$ and initial BOD $C_0=100\,\mathrm{mg/L}$, what is the BOD concentration after $t=3\,$days?
Question 5
Which indicator organism is recommended by the EPA for detecting fecal contamination in freshwater?