Waste IncineratorsSandi Dewberry
Renewable Resources
• Can be replenished fairly rapidly through natural processes as long as it is not used up faster than it is replaced
• Forests, grasslands, wild animals, fresh water, fresh air, and fertile soil
Nonrenewable Resources• Exist in a fixed quantity or stock in the earth’s crust• On a time scale of millions to billions of years, geological processes
can renew such resources– Humans don’t have that kind of time
• Depleted much faster than they are formed as a result of exponential growth in our resource use
Incineration - What is it?
• A process in which many types of hazardous wastes are heated to high temperatures (up to 2,000⁰C/3,600 ⁰F) to break them down and convert them to less harmful chemicals or harmless chemicals such as carbon dioxide and water
Incineration – How does it work?
How does it work? (Cont.)
Incineration - Who does it?
• Japan and a few European countries incinerate most of their municipal solid waste.
Advantages vs. DisadvantagesAdvantages
• Reduces trash volume• Less need for landfills• Low water pollution• Concentrates hazardous
substances into ash for burial or use as landfill cover
• Sale of energy reduces cost• Modern controls reduce air
pollution• Some facilities recover and
sell metals
Disadvantages• Expensive to build• Costs more than short-
distance hauling to landfills• Difficult to site because of
citizen opposition• Some air pollution• Older or poorly managed
facilities can release large amounts of air pollution
• Output approach that encourages waste production
• Can compete with recycling for burnable materials such as newspaper
More Disadvantages?
• Produces highly toxic ash– Must be safely and permanently stored in a landfill
especially designed for hazardous waste
Perfect Incineration
• Ideally, incinerators do not cause problems to the health of the plant workers, environment, or the public.
Incineration-Related Vocabulary
• Biomass – a diverse source of energy that consists of organic plant materials (such as wood and agricultural waste) and animal wastes that can be burned directly as a solid fuel or converted into gaseous or liquid biofuels
5 Question Quiz
• What temperature might incinerators reach?• Give an example of a country that also uses
incineration. • Name one benefit of incinerators.• Name one drawback of incinerators.• Ideally doesn’t cause problems to the health
of ______, _______, or _______.
Incinerator in Huntsville
• http://www.swdahsv.org/wtoe.html