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Electricity Generation And The Environment Paul Breeze

 
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MessagePosté le: Dim 9 Juil - 05:27 (2017)    Sujet du message: Electricity Generation And The Environment Paul Breeze Répondre en citant


Electricity Generation and the Environment
by Paul Breeze



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Retrieved 4 November 2009One difficulty in the studies is estimating the amount of EMF exposure a person receivesFor example, a typical 500 MW coal fired power plant uses 25 x 109 l/GW-year of water, which must be taken from a water source, and then cooled to return to the water source with as little environmental effect as possibleBirds may fly into power lines, resulting in electrocutionConventional Electricity What Are the Dangers of Solar Panels? More Articles How Does the Release of Car Exhaust Fumes Cause Global Warming? Short-Term & Long-Term Effects of Chemical Pollution The Advantages of Acid Rain Environmental Problems Associated With Recycling Aluminum Pollution Caused by Fossil Fuels Methods of Bioremediation of Landfill Sites Reader Services: My account Mobile RSS feeds Follow us on Twitter Facebook E-mail newsletters Company Info: Advertise online Contact us Send us tips Job openings About the P-I Hearst CorpPersonal exposure is measured in millisieverts (mSv)^ "15 Years of Progress" (PDF)Its negative impact on the environment lies in the creation of the solar cells which are made primarily of silica (from sand) and the extraction of silicon from silica may require the use of fossil fuels, although newer manufacturing processes have eliminated CO2 productionBurning biomass produces many of the same emissions as burning fossil fuelsIf dry cooling systems are used, significant water from the water table will not be usedTidal Turbines[edit]World Association of Nuclear OperatorsIt works by converting the sun's radiation into direct current (DC) power by use of photovoltaic cells"The possible role and contribution of geothermal energy to the mitigation of climate change" (PDF)Wet scrubbers use a liquid solution to remove PM from combustion gasSulfur and nitrogen oxides contribute to smog and acid rainTrees near the wires may be disturbed and may have to be continually managed to keep limbs from touching the wiresDischarges of pollution into water bodies, including thermal pollution (water that is hotter than the original temperature of the water body)It is stored for 40-50 years while the radioactivity decays to less than one percent of its original levelTransmission of bulk electricity from the generating station to the load uses wires suspended on large towers, known as transmission lines

The same acoustic concerns apply to tidal barragesToday, the presence of some radon around a uranium mining operation and some dust bearing radioactive decay products - as well as the hazards of inhaled coal dust in a coal mine - are well understoodBiomass[edit]The resulting sludge, which contains all the hazardous materials that pollution control devices capture, may be put in retention ponds, sent to landfills, or sold for use in making concrete blocks or asphaltWhile our understanding of relevant processes is improving, we do not know how much carbon dioxide the environment can absorb, nor how long-term global CO2balance is maintainedEnergy system environmental impact consists of fuel recovery and production, fuel transportation, electicity transmission, and spent fuel emissionsSome geothermal steam sources entrain non-soluble minerals that must be removed from the steam before it is used for generation; this material must be properly disposedDiversion of fresh or spent fuel to weapons production presents a risk of nuclear proliferation Water usage (gal/MW-h) Power source Low case Medium/Average case High case Nuclear power 400 (once-through cooling) 400 to 720 (pond cooling) 720 (cooling towers) Coal 58 [2] 530 Natural gas 100 (once-through cycle) 180 (with cooling towers) Hydroelectricity 1,430 Solar thermal 1,060 Geothermal 1,800 4,000 Biomass 300 480 Solar photovoltaic 30 Wind power .5 1 2.2 Land use for fuel production, power generation, and transmission and distribution lines 5d8a9798ff



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