CEA Remediation Technologies 3

Question 1

Thermal conductive heating (TCH) treats contaminated soil by:

Accepted Answer

Using electrical resistance heating elements to conduct heat uniformly through soil

Answer

TCH uses steel heating elements inserted into the subsurface that conduct heat directly through soil, raising temperatures sufficiently to volatilize and destroy contaminants including DNAPLs.

Question 2

The primary goal of a soil vapor extraction (SVE) system is to:

Accepted Answer

Extract volatile and semi-volatile organic contaminants from the vadose zone

Answer

SVE applies a vacuum to extraction wells in the vadose zone, inducing airflow that volatilizes and removes VOCs from soil pores for above-ground treatment.

Question 3

Ex situ bioremediation using a slurry-phase bioreactor offers which advantage over land farming?

Accepted Answer

Enhanced contact between microorganisms, nutrients, and contaminants due to mixing

Answer

Slurry-phase bioreactors mix contaminated soil with water and nutrients in a tank, maximizing contact and mass transfer, which accelerates biodegradation compared to static land farming.

Question 4

In phytoremediation, rhizofiltration specifically refers to:

Accepted Answer

The use of plant roots to absorb, concentrate, and precipitate contaminants from water

Answer

Rhizofiltration uses plant roots grown in contaminated water to adsorb and concentrate heavy metals or radionuclides, then harvested plant material is disposed of as hazardous waste.

Question 5

A remedial action objective (RAO) for a RCRA corrective action site must be based on:

Accepted Answer

Cleanup levels protective of human health and the environment, considering exposure pathways

Answer

RAOs define the cleanup goals needed to be protective of human health and the environment for current and reasonably anticipated future land and groundwater uses, considering all relevant exposure pathways.

(CEA) Certified Environmental Auditor Practice Test

(CEA) Certified Environmental Auditor Practice Test

CEA Remediation Technologies 3