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General Energetics (be able to apply these concepts!) • Potential energy – stored energy/energy at rest • Kinetic energy –energy in motion • Conductionv-transfer of energy through solid matter • Convection – transfer of energy through a fluid • First law of thermodynamics – energy cannot be created or destroyed • Second law of thermodynamics – energy is degraded to a lesser form (increasing disorder) • Renewable – generated again within a human lifespan Pollution • Point source – a pollution source that can be identified • Non point source- source cannot be located – indirect; run off • BOD – biological oxygen demand – amount of oxygen required to support biological functions • Indicator species – species that can indicate the condition of the environment • Eutrophication – growth of vegetation in a water body – artificial due to increase in nitrates and phosphates • Primary pollutant – causes direct harm to environment • Secondary pollutant – one or mor chemcials react to create pollutatnt • Stationary source – immovable source of pollution i.e. factory • Mobile source – movable source of pollution i.e. vehicle Air Pollution • Air pollution – Primary • CO, Nox, sox, VOCs, Particulates, Lead – Criteria – regulated by EPA • Nox, voc, sox, particulates, ozone, CO • Sources – Burning fossil fuels – co, nox, voc, sox – Construction/mining/agriculture - particluates – Indsutrial chemicals – vocs, lead, co – Secondary • Tropsopheric ozone – car exhaust (NOX) + O2 + sunlight • Smog– industrial – grey smog (SOX) – Photochemical - - brown – (ozone/NOX) » Concentration of cars » Heat island » Sunlight & temp » Inversion layer ( layer of cold air trapping layer of warm air) • acid deposition Sox and (nox) combine with water vapor – Can form many miles from source – Primary source – coal burning powr plants Problems with AP • Smog – – – – – Respiratory distress (asthma, bronchitis, emphysema) Damages vegetation/building materials Blocks sunlight/ limits vision Asethic value • Acid PRecip – – – – – Weakens plants – depletes nutrients in soil Deteriorates buildings/metals Increase in metal concentrations in water Lowers pH of water Aggrevates respiratory problems • Tropospheric Ozone – Respiratory distress – Acts as a greenhouse gas – Component of smog Indoor AP • • Radon, smoke, asbestos, formaldehyde, dust/particulates, chloroform, lead (paint and pipes), CO, VOCs, molds, fungus, viruses, bacteria, Causes of Sick Building Syndrome – – – – • Symptoms of SBS – – – – – • Enclosed building Poor ventilation Unfiltered/recycled air Lack of vegetation Nausea/vomiting Allergies Dizziness Skin irritation Irritability/memory loss Solutions – – – – – – Ventilation No smoking indoors Cleaning filters Add plants Using low/no odor chemicals for cleaning Replace/limit carpet & fabric furniture Remeditation/reduction Strategies • Remediation/cleanup – Source – Power Plants - Filter – scrubbers (sox, nox, particulates) – electrostatic precipitator; bag house; – Catalytic converters – clean coal – wash/scrib before use • Reduce pollution created – Switch to alternative energy – wind, solar, hydro, geothermal, biomass – Regulations – clean air act – Subsidies or tax breaks for purchasing/using alternative energies – Tax use of conventional energies Tropos vs strato Ozone • Stratospheric • Tropospheric – Created by VOCs, nox and oxygen – Ground level – Creates respiratory problems – Component of smog – Chemical formula for formation – NOX + O2 NO + O3 – Naturally occurring – Protects UV radiation – Being depleted by CFCs – chlorofluorocarbons – Impact of depleted Ozone • Higher skin cancer rates; cataracts; weakens immune system; • Damages crops Ultraviolet light hits a chlorofluorocarbon (CFC) molecule, such as CFCl3, breaking off a chlorine atom and leaving CFCl2. Sun Cl Ozone Depletion UV radiation The chlorine atom attacks an ozone (O3) molecule, pulling an oxygen atom off it and leaving an oxygen molecule (O2). Summary of Reactions CCl3F + UV Cl + CCl2F Cl + O3 ClO + O2 Repeated Cl + O Cl + O2 many times Once free, the chlorine atom is off to attack another ozone molecule and begin the cycle again. A free oxygen atom pulls the oxygen atom off the chlorine monoxide molecule to form O2. The chlorine atom and the oxygen atom join to form a chlorine monoxide molecule (ClO). Fig. 20-18, p. 486 Detection and treatment of Pollution • Montreal Protocol – International treaty calling for ban on ozone depleting chemicals • Physical treatment – filter through screens to remove physical debris • Primary sewage treatment – physical and organic material • Secondary sewage treatment – biological treatment • Turbidity – density of suspended particles in water column • Dissolved oxygen – amount of oxygen dissolved (contained) in water – can be an indicator of pollution levels • Dead zone – excess nutrients from runoff depletes oxygen and kills off life Water Pollution Types • Disease-causing Agents – pathogens • Oxygen Demanding Agents – organic waste: manure • Water-soluble Inorganic Chemicals – acids, toxic metals • Inorganic Plant Nutrients – nitrogen and phosphorus • Organic Chemicals – oil, pesticides, detergents • Sediment or Suspended Material – erosion, soil • Water-soluble Radioactive Isotopes – radon uranium • Heat – electric and nuclear power plants Water Pollution • Water pollution – Artificial Eutrophication • Excess nitrates & phosphates from fertilizers – Run off from agriculture, yards and golf courses • Excess growth of algae – Death of algae causes loss of oxygen (higher BOD) – May result in “dead zones” areas of low DO in oceans • Solutions – Reduce runoff ; use less fertilizer – switch to organic fertrillizers (manure) – Surface and groundwater • Landfill leachate – heavy metals, toxic chemicals • Sewage – bacteria, protozoans (parasites); toxic chemicals; medications • Radioactive material – hazardous waste disposal • Oil and gasoline – runoff from roads & parking lots; boating; underground tanks • Industrial effluent – discharge of contaminated liquids from factories • Mining – acid mine drainage (water mixing with minerals creates acid) Category Example Oxygen demanding waste Animal Sewage, manaure and feedlots, plat debris paper mills food processing Acids, toxic Runoff, metals, salts industrial effluent, household cleaners Inorganic Chemicals Source Effects Deplete water of Do – causing fish kills Unusable for drinking; skin cancers, nervous systems, liver kidney damage • Wastewater – Municipal and household waste • Primary treatment – Screened for large particles – Settling tank – settles particles removes scum • Secondary – Biological treatment – add “good” bacteria to consume the bacteria present in water • Tertiary – Removes nitrates and phosphates • Chlorinate/dechlorinate ( or UV or ozone to kill bacteria) • Clean water act – support to build wwtp for municipalities Climate Change • Anthropogenic –human generated/created • Greenhouse gases (name) – – – – • • • • • • • Carbon dioxide Methane Water vapor Nitrogen oxide • Manmade – sf6, cfc,ozone, etc. Albedo – ability to reflect light Carbon sink – container for holding carbon i.e. ocean; trees; coal/petroleum Sequester – to set apart from IPCC – international panel on climate change Radiative forcing – something capable of changing heat energy on the planet Bioaccumulation –substances accumulates (builds up) in the organism (especially in fatty tissues) Biomagnification – amount increases up the food chain Climate Change • Greenhouse effect – 1) UV penetrates atmosphere; 2) absorbed by objects on earth based on albedo 3)heat energy is generated; 4)heats the atmosphere – rises 5) heat is blocked by GHG; radiates in the troposphere – results in global warming • Global warming increases – due to increase in GHG which traps more infrared radiation Inputs to GW • Complex system of inputs – – – – – – – – – – GHG Solar radiation changes (sunspots/flares) Change in albedo Vegetation Water temp Ocean changes Tilt of earth Relative cloud cover Depletion of ozone layer Tectonic plate movement – changes amount of continuous land space – Aerosols from fire/volcanic activity – Extinction events Evidence of Past climate change • Ice Core Data • Can be used to evaluate past climate – Concetration of gases – Particulates in the atmosphere • Volcanoes/fires – Types of organisms alive (pollen) – Weather patterns • Amount of snow cover => precipation levels • Temperature changes • Seasonal changes • Tree rings • Sedimentary rock – ocean basins • Evolution of organisms Evidence of current CC • Glaciers melting • Increasing sea level and temperatures – Bleaching of coral reefs • • • • More severe storms (hurricanes) Change in el-nino patterns Changes in precipitation patterns Changes in migration patterns (i.e. canadian hemlock) “negative” Impacts of climate change • • • • • • • • Agriculture Biodiversity Weather extremes Water resources Forests Sea level & coastal change Human health Human populations Positive changes from GCC • Provide new species habitat • Increase ocean productivity • Warmer temperatures for some areas possibly provide new agricultural areas • Less dependence on energy for heating?? • Bring water to formerly dry areas • Winter dormancy ends earlier (earlier crop harvest) • Page 460 Solutions to GCC • Use of alternative energy sources • Plant trees/reduce use of trees for products • Sequester CO2 in ocean or other long term storage • Slow population growth • Sustainable agriculture – use of organic fertilizers/pesticides • Carbon taxes • Alternative energy incentives • Capture methane from landfills • Lower co2 quotas Ocean Resources • Fishing techniques&problems • Long line • Snags, bycatch, disrupts migration routes – Bottom trawling • Disrupts ocean floor ecosystems – coral reefs – Seine netting • Bycatch (turtles), TED Turtle evacuation Device – Aquaculture – fish farming • Loss of biodiversity, pollution (excess nitrates/BOD), – Traps – crab, lobster • Tragedy of the commons – Overuse of resources that belong to everyone (common) • By catch – non target organisms caught – turtles/dolphins • Laws – magnuson-stevenson act, Marine Mammal Protection act P117 ap book) Ecological footprint • Amount of resources used by an individual or population • I=PxAxT