BCE Environmental Engineering 2

Question 1

Which type of lagoon uses only natural processes (wind, sunlight, algae) for wastewater treatment?

Accepted Answer

Stabilization pond

Answer

Stabilization ponds (waste stabilization ponds) rely on natural sunlight, wind, and algal-bacterial symbiosis for wastewater treatment without mechanical aeration.

Question 2

What is the purpose of the activated sludge process in secondary wastewater treatment?

Accepted Answer

To biologically degrade dissolved organic matter using microorganisms

Answer

The activated sludge process uses a biologically active suspension of microorganisms in an aeration tank to metabolize dissolved and colloidal organic matter from wastewater.

Question 3

Solid waste disposed in a sanitary landfill must be compacted and covered daily primarily to:

Accepted Answer

Control odors, vectors, and fire hazards

Answer

Daily cover of compacted solid waste controls odors, prevents vector attraction (rodents, flies), reduces fire risk, and controls litter blowing off the site.

Question 4

Which air pollutant is primarily responsible for acid rain?

Accepted Answer

Sulfur dioxide (SO₂) and nitrogen oxides (NOₓ)

Answer

Acid rain results from SO₂ and NOₓ emissions (primarily from fossil fuel combustion) that react with water vapor in the atmosphere to form sulfuric and nitric acids.

Question 5

What is the environmental significance of the dissolved oxygen (DO) level in a stream?

Accepted Answer

It reflects the ability of the stream to support aquatic life and indicates organic pollution levels

Answer

DO levels indicate both the health of the aquatic ecosystem and the degree of organic pollution; low DO caused by BOD exertion stresses or kills fish and other organisms.

BCE - Bachelor of Civil Engineering Practice Test

BCE - Bachelor of Civil Engineering Practice Test

BCE Environmental Engineering 2