AQS Remediation & Mitigation Strategies 2

Question 1

Which soil vapor extraction (SVE) design parameter most directly controls the radius of influence at a contaminated site?

Accepted Answer

Soil permeability and applied vacuum

Answer

Soil permeability and the applied vacuum together determine how far the pressure gradient extends, defining the SVE radius of influence.

Question 2

In a bioventing system for petroleum hydrocarbon remediation, the primary goal of air injection is to:

Accepted Answer

Supply oxygen to stimulate indigenous aerobic microorganisms

Answer

Bioventing delivers oxygen to the vadose zone to enhance aerobic biodegradation of hydrocarbons by native bacteria.

Question 3

A permeable reactive barrier (PRB) using zero-valent iron (ZVI) remediates chlorinated solvents primarily through:

Accepted Answer

Reductive dechlorination via electron donation

Answer

ZVI donates electrons to chlorinated ethenes, sequentially removing chlorine atoms through reductive dechlorination.

Question 4

When designing an air pollution control system, the pressure drop across a fabric filter (baghouse) is primarily important because it affects:

Accepted Answer

Fan energy consumption and filtration velocity

Answer

Pressure drop determines the energy required to move air through the system and governs actual filtration velocity (air-to-cloth ratio).

Question 5

Which in situ chemical oxidation (ISCO) reagent is most appropriate when treating a site with high natural organic matter (NOM) content?

Accepted Answer

Persulfate activated with heat or alkali

Answer

Persulfate, particularly when thermally or alkaline-activated, is less quenched by NOM than permanganate or Fenton's reagent and is preferred at high-NOM sites.

(AQS) Air Quality Specialist Certification Practice Test

(AQS) Air Quality Specialist Certification Practice Test

AQS Remediation & Mitigation Strategies 2