43.Biomass energy sources are all around us. They include many types of plants and plant- derived material. List examples. agricultural crops and wastes;

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Presentation transcript:

43.Biomass energy sources are all around us. They include many types of plants and plant- derived material. List examples. agricultural crops and wastes; trees, forestry wastes, and mill residues; animal wastes; and municipal solid waste About 11 percent of world primary energy today is produced from biomass, but this comes mostly from low-technology applications in developing countries. List examples. burning crop waste, wood, or dung for home heating and cooking

44. Burning of biomass fuels in primitive stoves is very inefficient and generates large quantities of pollutants and are especially harmful when released in poorly ventilated houses. List (4) pollutants produced by the burning of biomass. fine particulates, sulfur and nitrogen oxides, and carbon monoxide

Type of biomass EthanolBiodiesel Bulleted list of facts about each Also known as ethyl alcohol or grain alcohol can be fermented from sugars found in corn and other crops and added to conventional gasoline ethanol lowers reliance on conventional oil and increases the combustion efficiency of gasoline, reducing pollutant emissions 45. Advanced biomass technologies that use organic material cleanly and efficiently offer much greater opportunities. One of the fastest-growing biomass applications today is production of transportation fuels from plant sources. Compare Ethanol and Biodiesel in the chart below. is essentially vegetable oil can also be derived from a wide range of plant sources, including rapeseed, sunflowers, and soybeans can be used in most conventional diesel engines biodiesel can reduce pollution from heavy-duty vehicles such as trucks and buses because it burns more cleanly than its petroleum-based counterpart

46. Both ethanol and biodiesel are viable sources of renewable energy for two reasons. State the two reasons. can reduce our dependence on conventional fossil fuels and reduce harmful emissions However, there are some drawbacks as well. List issues involving the use ethanol and biodiesel. growing biofuel crops uses major quantities of fossil fuel to manufacture fertilizer, run farm machines, and ship the fuel to market, so these biofuels do not always offer significant net energy savings over gas and diesel fuel. Crops are water- intensive and remove significant levels of nutrients from soil. Relying too heavily on these sources could mean diverting crops from the food supply.

47. Analysts generally agree that, at best, corn ethanol offers modest energy savings over gasoline, and that the real promise lies in making ethanol from cellulosic (woody) plants such as switchgrass, willows, and poplars. What are (3) pros of using switchgrass as a fuel source? It can sequester large amounts of carbon, restore nutrients to soil, and can be used to stabilize land threatened by erosion List pros and cons of cellulosic plant tissue. It is tough and must be broken down before it can be fermented, but contains substantially more energy per unit than carbohydrates such as corn. Many experts believe that cellulosic ethanol will become a significant energy source in the United States in the next one to two decades.

48. Biomass can also be used to generate electricity. A number of U.S. power plants either run completely on biomass fuels or co-fire them with coal to reduce emissions. Many industrial facilities, especially in the pulp and paper industry, produce significant quantities of electric power using residual biomass fuels such as wood pulp that are generated from their own production facilities.

Spanish River Pulp & Paper Company, ON

Pulp & paper industry is a combination of production of raw material and production of end-products like paper, carton- or paperboard.

49. Human and animal wastes can also produce electricity. On farms, devices called anaerobic digesters use microbes to break down manure into organic solids and biogas, which typically contains about 60 percent methane and 40 percent CO 2 _. The methane can be burned to generate electricity and reduce greenhouse emissions. Similarly, many large landfills collect the biogas that is generated by decomposition of buried organic waste and burn it to generate electricity.

Active Landfill

Biogas collection plant

A landfill that now produces biogas.

50. What is one of the most important environmental benefits of using biofuels? biomass energy is carbon- neutral—that is, using it does not increase long-term greenhouse gas levels in the atmosphere Biomass fuels such as timber release carbon when they are burned, but this carbon was sequestered from the atmosphere when the original trees grew and would have been released when they died and decayed, so using biofuels simply completes the natural carbon cycle. In contrast, burning burning coal or oil releases carbon that was previously sequestered underground for millions of years and would have stayed there if it were not mined for energy, so it represents a net transfer of carbon from terrestrial sinks to the atmosphere. Biomass energy thus does not contribute to global climate change unless it is harvested more quickly than it regenerates—for example, when large forest areas are clear-cut.

NREL Teams with Navy, Private Industry to Make Jet Fuel from Switchgrass