AQS Remediation & Mitigation Strategies 3

Question 1

Which emission control technology is most effective for removing fine particulate matter (PM2.5) from industrial exhaust streams?

Accepted Answer

Electrostatic precipitator (ESP)

Answer

Electrostatic precipitators use electrical charges to capture PM2.5 and smaller particles with efficiencies exceeding 99%.

Question 2

A facility implements a leak detection and repair (LDAR) program primarily to control emissions of:

Accepted Answer

Fugitive VOC emissions from valves, flanges, and connectors

Answer

LDAR programs specifically target fugitive VOC emissions from equipment components such as valves, pump seals, and pipe flanges.

Question 3

In phytoremediation, the process by which plants absorb, translocate, and concentrate contaminants in aboveground biomass is called:

Accepted Answer

Phytoextraction

Answer

Phytoextraction involves uptake of metals or organics into plant tissue, which is then harvested to remove contaminants from the site.

Question 4

Selective catalytic reduction (SCR) systems used to control NOx emissions require which input chemical?

Accepted Answer

Urea or anhydrous ammonia

Answer

SCR systems inject urea or ammonia as a reductant; over a catalyst, it reacts with NOx to produce harmless N₂ and H₂O.

Question 5

Which condition would most likely cause a thermal oxidizer to fail to meet its destruction and removal efficiency (DRE) permit limit?

Accepted Answer

Combustion chamber temperature falling below design setpoint

Answer

DRE depends on the three Ts (temperature, time, turbulence); insufficient temperature is the most common cause of incomplete destruction.

(AQS) Air Quality Specialist Certification Practice Test