3. Air Pollution

Control Technologies — Quiz

Test your understanding of control technologies with 5 practice questions.

Practice Questions

Question 1

In a packed bed adsorption system, the breakthrough curve is used to assess performance. If the mass transfer zone (MTZ) length increases significantly, how would this impact the breakthrough time and the overall efficiency of pollutant removal?

Question 2

Consider a catalytic oxidizer designed to treat an exhaust stream containing volatile organic compounds (VOCs). If the system's operating temperature is maintained, but the catalyst experiences fouling due to the deposition of non-volatile compounds, what is the most likely immediate effect on the VOC destruction efficiency?

Question 3

A venturi scrubber is being used to remove fine particulate matter from a gas stream. To achieve a higher collection efficiency for sub-micron particles, which of the following design modifications would be most effective?

Question 4

In the design of a fabric filter (baghouse) for particulate control, the air-to-cloth ratio is a critical parameter. If the air-to-cloth ratio is significantly increased beyond its optimal range, what is the most probable consequence on the system's performance?

Question 5

A selective catalytic reduction (SCR) system is used for $\text{NO}_x$ control, where the primary reaction is: $ \text{NO}_x + \text{NH}_3 \xrightarrow{\text{catalyst}} \text{N}_2 + \text{H}_2\text{O} $ If the inlet $\text{NO}_x$ concentration suddenly decreases while the ammonia injection rate remains constant (optimized for the original, higher $\text{NO}_x$ concentration), what is the most likely consequence?