CPWM Waste Treatment Technologies 2

Question 1

Which thermal treatment technology uses a rotating cylindrical chamber to treat heterogeneous waste streams at high temperatures?

Accepted Answer

Rotary kiln incineration

Answer

Fluidized bed combustion

Answer

Plasma arc gasification

Answer

Wet air oxidation

Question 2

In biological waste treatment, what is the primary difference between aerobic and anaerobic digestion?

Accepted Answer

Aerobic digestion uses oxygen; anaerobic digestion occurs without oxygen

Answer

Aerobic digestion produces methane; anaerobic does not

Answer

Anaerobic digestion requires oxygen; aerobic does not

Answer

Anaerobic digestion is faster than aerobic digestion

Question 3

What is the primary purpose of a scrubber system in a waste-to-energy facility?

Accepted Answer

To remove pollutants from flue gas before emission

Answer

To increase combustion temperature

Answer

To separate recyclables from mixed waste

Answer

To compress ash for landfill disposal

Question 4

Which chemical treatment process is used to reduce the solubility and mobility of heavy metals in hazardous waste?

Accepted Answer

Stabilization/solidification

Answer

Hydrolysis

Answer

Oxidation-reduction

Answer

Ion exchange

Question 5

A waste treatment facility processes 200 tons/day of municipal solid waste with an 80% volume reduction via incineration. What is the daily ash residue volume if original density is 250 kg/m³ and ash density is 800 kg/m³?

Accepted Answer

62.5 m³

Answer

100 m³

Answer

25 m³

Answer

80 m³

Question 6

Which pyrolysis product has the highest energy value and is most suitable for use as a fuel?

Accepted Answer

Pyrolysis oil (bio-oil)

Answer

Biochar

Answer

Syngas

Answer

Carbon black

Question 7

What does the term 'tipping fee' refer to in waste management facility operations?

Accepted Answer

Fee charged to waste generators for accepting waste at a treatment facility

Answer

Cost of purchasing waste collection vehicles

Answer

Penalty imposed for improper waste disposal

Answer

Tax levied on recyclable material sales