It is generating energy from waste What is “waste-to-energy?”
Energy from Waste can make an important contribution towards sustainable development as a source of renewable energy:
Municipal Solid Wastes contain biomass and can be used as a fuel
use waste to generate electricity, heat or both
The heat recovered from waste incineration can be used to generate electricity, or for industrial heat applications
Economy Environment If so,why we do not use Renewable energ on very large scale?
Actual Economy/Environment Choices Less Cost / widget More Less Pollution/widget More Cost Up Pollution Up No Interest Cost down Pollution up Disrupts environment Cost up Pollution down Disrupts Economy Cost Down Pollution Down Win-Win
JUST BURN IT !
can burn garbage in special plants and use its heat energy to make steam to heat buildings or to generate electricity
This may sound amazing, but it is really nothing new. More than half of electric power companies already burn another type of solid material to make electricity. That material is coal
Coal is a mineral that was formed from the remains of plants that died millions of years ago.
Power companies use the heat energy in coal to make electricity.
providing electricity is not the major advantage of waste-to-energy plants.
In fact, it costs more to generate electricity at a waste-to-nergy plant than it does at a coal, nuclear, or hydropower plant
The major advantage of burning waste is that it reduces the amount of garbage we bury in landfills.
Burning waste substantially reduces the amount of trash going to landfills. Waste-to-energy plants dispose of the waste of 40 million people.
reducing the use of fossil fuels by producing renewable energy for the National Grid
Why is reducing the amount of waste buried in landfills ?
Burning garbage releases the chemicals and substances found in the waste
Some chemicals can be dangerous to people, the environment
cutting emissions of greenhouse gasses
waste-to-energy plants produce air pollution
Pollution of land, water and air
emission of dioxin
Non-availability of land for landfills
Increasing cost of transportation
Disagreeable (visual, mell,…)
Health risks (epidemic)
work very much like coal-fired power plants. The difference is the fuel. Waste-to-energy plants use garbage—not coal—to fire an industrial boiler. The same steps are used to make electricity in a waste-to-energy plant as in a coal-fired power plant: 1. The fuel is burned, releasing heat. 2. The heat turns water into steam. 3. The high-pressure steam turns the blades of a turbine generator to produce electricity. 4. A utility company sends the electricity along power lines to homes, schools, and businesses.
can think of garbage as a mixture of energy-rich fuels In 100 pounds of typical garbage, more than 80 pounds can be burned as fuel to generate electricity at a power plant. Those fuels include paper, plastics, and yard waste A ton of garbage generates about 525 kilowatt-hours (kWh) of electricity energy to heat a typical office building for one day.
TRASH BURNED IN WASTE-TO-ENERGY PLANTS
ENERGY FROM WASTE
Potential of power generation
Urban and Municipal Wastes : 1000 MW
Industrial Wastes : 700 MW
(Dairy, Distillery, Press Mud, Tannery,
Pulp & Paper and Food Processing
TOTAL : 1700 MW
Number of Plants and Capacity
FUEL FUEL WASTE ELECTRICITY 33% 67% ELECTRICITY STEAM WASTE 30% 45% 25% What is Combined Heat and Power?
Combined Heat and Power Waste Heat Recovery CHP Plant 33 units Waste Energy End User Site Fuel 100 units Pollution = 66 units Useful Work 33 units Electricity 33 units Thermal Energy
Industrial Energy Options Electricity Steam Hot Water End User Site Finished Goods Waste Energy Energy Recycling Plant Saved Energy Input Electricity Process Fuel
The Eco Cycle Society
Waste amount treated
Amounts of Waste Incinerated
emissions from waste
cumulative dioxin emissions from WTE plants in 2000 each point represents the emissions of a single plant, in grams
The distribution of dioxin sources in the US in recent years, showing how waste-to-energy ceased to be a major contributor of dioxin emissions
Health effects associated with dioxin exposure
Chloracne and other skin disorders;
Disrupts liver and kidney function;
Alters hormone levels: thyroid, testosterone and estrogen;
Reproductive effects: altered sex ratio, reduced fertility;
Birth defects: hypospadias;
Mercury emissions from WTE (1989-1999) and coal-fired power plants
Dioxin to air from W-t-E
What is hazardous waste ?
Main hazardous properties available for treated wood waste
H6 : very toxic, or containing very toxic substances at a total C 0,1%, or toxic, or containing toxic substances at a total C 3%
H5 : harmful, or containing harmful substances at a total C 25%