Ch.7 Pollutants and Specific Plants Or Facilities

Question 1

Advantage of waste incineration

Answer 1

1. Reduce the volume of waste
2. Allow for the recovery of energy
3. Destroy a number of contaminants that may be present in the waste

Question 2

Incineration produces energy but causes air pollution

Answer 2

1. Combustible gases ( carbon monoxide)

2. Non- combustible gases (nitrogen oxides，sulphur oxide)

Question 3

Ways to reduce pollutants in the exhaust gas

Answer 3

The exhaust gas from the boiler is cleaned by the following pollution control system

1. Activated carbon injection
2. Bag house filter

Question 4

Incinerator’s solid outputs

Answer 4

1. Fly ash
   - > contain high concentrations of heavy metal and small amounts of dioxins and furans
2. Bottom ash
   - > dried bottom ash maybe used as an aggregate in road construction and concrete